Support sqlite in addition to postgres (#869)

* Move current work into single branch

* Initial massaging of clientapi etc (not working yet)

* Interfaces for accounts/devices databases

* Duplicate postgres package for sqlite3 (no changes made to it yet)

* Some keydb, accountdb, devicedb, common partition fixes, some more syncapi tweaking

* Fix accounts DB, device DB

* Update naffka dependency for SQLite

* Naffka SQLite

* Update naffka to latest master

* SQLite support for federationsender

* Mostly not-bad support for SQLite in syncapi (although there are problems where lots of events get classed incorrectly as backward extremities, probably because of IN/ANY clauses that are badly supported)

* Update Dockerfile -> Go 1.13.7, add build-base (as gcc and friends are needed for SQLite)

* Implement GET endpoints for account_data in clientapi

* Nuke filtering for now...

* Revert "Implement GET endpoints for account_data in clientapi"

This reverts commit 4d80dff4583d278620d9b3ed437e9fcd8d4674ee.

* Implement GET endpoints for account_data in clientapi (#861)

* Implement GET endpoints for account_data in clientapi

* Fix accountDB parameter

* Remove fmt.Println

* Fix insertAccountData SQLite query

* Fix accountDB storage interfaces

* Add empty push rules into account data on account creation (#862)

* Put SaveAccountData into the right function this time

* Not sure if roomserver is better or worse now

* sqlite work

* Allow empty last sent ID for the first event

* sqlite: room creation works

* Support sending messages

* Nuke fmt.println

* Move QueryVariadic etc into common, other device fixes

* Fix some linter issues

* Fix bugs

* Fix some linting errors

* Fix errcheck lint errors

* Make naffka use postgres as fallback, fix couple of compile errors

* What on earth happened to the /rooms/{roomID}/send/{eventType} routing

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

103 files changed, 9463 insertions, 706 deletions

diff --git a/appservice/api/query.go b/appservice/api/query.go
index 9542df56..7e61d623 100644
--- a/appservice/api/query.go
+++ b/appservice/api/query.go
@@ -140,7 +140,7 @@ func RetrieveUserProfile(
 	ctx context.Context,
 	userID string,
 	asAPI AppServiceQueryAPI,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 ) (*authtypes.Profile, error) {
 	localpart, _, err := gomatrixserverlib.SplitID('@', userID)
 	if err != nil {
diff --git a/appservice/appservice.go b/appservice/appservice.go
index f2cbcce2..18179987 100644
--- a/appservice/appservice.go
+++ b/appservice/appservice.go
@@ -41,8 +41,8 @@ import (
 // component.
 func SetupAppServiceAPIComponent(
 	base *basecomponent.BaseDendrite,
-	accountsDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountsDB accounts.Database,
+	deviceDB devices.Database,
 	federation *gomatrixserverlib.FederationClient,
 	roomserverAliasAPI roomserverAPI.RoomserverAliasAPI,
 	roomserverQueryAPI roomserverAPI.RoomserverQueryAPI,
@@ -111,8 +111,8 @@ func SetupAppServiceAPIComponent(
 // `sender_localpart` field of each application service if it doesn't
 // exist already
 func generateAppServiceAccount(
-	accountsDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountsDB accounts.Database,
+	deviceDB devices.Database,
 	as config.ApplicationService,
 ) error {
 	ctx := context.Background()
diff --git a/appservice/consumers/roomserver.go b/appservice/consumers/roomserver.go
index dbdae532..b9a56795 100644
--- a/appservice/consumers/roomserver.go
+++ b/appservice/consumers/roomserver.go
@@ -33,7 +33,7 @@ import (
 // OutputRoomEventConsumer consumes events that originated in the room server.
 type OutputRoomEventConsumer struct {
 	roomServerConsumer *common.ContinualConsumer
-	db                 *accounts.Database
+	db                 accounts.Database
 	asDB               *storage.Database
 	query              api.RoomserverQueryAPI
 	alias              api.RoomserverAliasAPI
@@ -46,7 +46,7 @@ type OutputRoomEventConsumer struct {
 func NewOutputRoomEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
-	store *accounts.Database,
+	store accounts.Database,
 	appserviceDB *storage.Database,
 	queryAPI api.RoomserverQueryAPI,
 	aliasAPI api.RoomserverAliasAPI,
diff --git a/appservice/routing/routing.go b/appservice/routing/routing.go
index 8a24caad..42fa8052 100644
--- a/appservice/routing/routing.go
+++ b/appservice/routing/routing.go
@@ -38,7 +38,7 @@ const pathPrefixApp = "/_matrix/app/v1"
 func Setup(
 	apiMux *mux.Router, cfg *config.Dendrite, // nolint: unparam
 	queryAPI api.RoomserverQueryAPI, aliasAPI api.RoomserverAliasAPI, // nolint: unparam
-	accountDB *accounts.Database, // nolint: unparam
+	accountDB accounts.Database, // nolint: unparam
 	federation *gomatrixserverlib.FederationClient, // nolint: unparam
 	transactionsCache *transactions.Cache, // nolint: unparam
 ) {
diff --git a/clientapi/auth/storage/accounts/account_data_table.go b/clientapi/auth/storage/accounts/postgres/account_data_table.go
index 1b7484d8..d0cfcc0c 100644
--- a/clientapi/auth/storage/accounts/account_data_table.go
+++ b/clientapi/auth/storage/accounts/postgres/account_data_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package accounts
+package postgres
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/accounts/accounts_table.go b/clientapi/auth/storage/accounts/postgres/accounts_table.go
index e86654ec..6b8ed372 100644
--- a/clientapi/auth/storage/accounts/accounts_table.go
+++ b/clientapi/auth/storage/accounts/postgres/accounts_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package accounts
+package postgres
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/accounts/filter_table.go b/clientapi/auth/storage/accounts/postgres/filter_table.go
index 2b07ef17..c54e4bc4 100644
--- a/clientapi/auth/storage/accounts/filter_table.go
+++ b/clientapi/auth/storage/accounts/postgres/filter_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package accounts
+package postgres
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/accounts/membership_table.go b/clientapi/auth/storage/accounts/postgres/membership_table.go
index 7b7c50ac..426c2d6a 100644
--- a/clientapi/auth/storage/accounts/membership_table.go
+++ b/clientapi/auth/storage/accounts/postgres/membership_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package accounts
+package postgres
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/accounts/profile_table.go b/clientapi/auth/storage/accounts/postgres/profile_table.go
index 157bb99b..38c76c40 100644
--- a/clientapi/auth/storage/accounts/profile_table.go
+++ b/clientapi/auth/storage/accounts/postgres/profile_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package accounts
+package postgres
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/accounts/postgres/storage.go b/clientapi/auth/storage/accounts/postgres/storage.go
new file mode 100644
index 00000000..cb74d131
--- /dev/null
+++ b/clientapi/auth/storage/accounts/postgres/storage.go
@@ -0,0 +1,392 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/gomatrixserverlib"
+	"golang.org/x/crypto/bcrypt"
+
+	// Import the postgres database driver.
+	_ "github.com/lib/pq"
+)
+
+// Database represents an account database
+type Database struct {
+	db *sql.DB
+	common.PartitionOffsetStatements
+	accounts     accountsStatements
+	profiles     profilesStatements
+	memberships  membershipStatements
+	accountDatas accountDataStatements
+	threepids    threepidStatements
+	filter       filterStatements
+	serverName   gomatrixserverlib.ServerName
+}
+
+// NewDatabase creates a new accounts and profiles database
+func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (*Database, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	partitions := common.PartitionOffsetStatements{}
+	if err = partitions.Prepare(db, "account"); err != nil {
+		return nil, err
+	}
+	a := accountsStatements{}
+	if err = a.prepare(db, serverName); err != nil {
+		return nil, err
+	}
+	p := profilesStatements{}
+	if err = p.prepare(db); err != nil {
+		return nil, err
+	}
+	m := membershipStatements{}
+	if err = m.prepare(db); err != nil {
+		return nil, err
+	}
+	ac := accountDataStatements{}
+	if err = ac.prepare(db); err != nil {
+		return nil, err
+	}
+	t := threepidStatements{}
+	if err = t.prepare(db); err != nil {
+		return nil, err
+	}
+	f := filterStatements{}
+	if err = f.prepare(db); err != nil {
+		return nil, err
+	}
+	return &Database{db, partitions, a, p, m, ac, t, f, serverName}, nil
+}
+
+// GetAccountByPassword returns the account associated with the given localpart and password.
+// Returns sql.ErrNoRows if no account exists which matches the given localpart.
+func (d *Database) GetAccountByPassword(
+	ctx context.Context, localpart, plaintextPassword string,
+) (*authtypes.Account, error) {
+	hash, err := d.accounts.selectPasswordHash(ctx, localpart)
+	if err != nil {
+		return nil, err
+	}
+	if err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(plaintextPassword)); err != nil {
+		return nil, err
+	}
+	return d.accounts.selectAccountByLocalpart(ctx, localpart)
+}
+
+// GetProfileByLocalpart returns the profile associated with the given localpart.
+// Returns sql.ErrNoRows if no profile exists which matches the given localpart.
+func (d *Database) GetProfileByLocalpart(
+	ctx context.Context, localpart string,
+) (*authtypes.Profile, error) {
+	return d.profiles.selectProfileByLocalpart(ctx, localpart)
+}
+
+// SetAvatarURL updates the avatar URL of the profile associated with the given
+// localpart. Returns an error if something went wrong with the SQL query
+func (d *Database) SetAvatarURL(
+	ctx context.Context, localpart string, avatarURL string,
+) error {
+	return d.profiles.setAvatarURL(ctx, localpart, avatarURL)
+}
+
+// SetDisplayName updates the display name of the profile associated with the given
+// localpart. Returns an error if something went wrong with the SQL query
+func (d *Database) SetDisplayName(
+	ctx context.Context, localpart string, displayName string,
+) error {
+	return d.profiles.setDisplayName(ctx, localpart, displayName)
+}
+
+// CreateAccount makes a new account with the given login name and password, and creates an empty profile
+// for this account. If no password is supplied, the account will be a passwordless account. If the
+// account already exists, it will return nil, nil.
+func (d *Database) CreateAccount(
+	ctx context.Context, localpart, plaintextPassword, appserviceID string,
+) (*authtypes.Account, error) {
+	var err error
+
+	// Generate a password hash if this is not a password-less user
+	hash := ""
+	if plaintextPassword != "" {
+		hash, err = hashPassword(plaintextPassword)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if err := d.profiles.insertProfile(ctx, localpart); err != nil {
+		if common.IsUniqueConstraintViolationErr(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	if err := d.SaveAccountData(ctx, localpart, "", "m.push_rules", `{
+		"global": {
+			"content": [],
+			"override": [],
+			"room": [],
+			"sender": [],
+			"underride": []
+		}
+	}`); err != nil {
+		return nil, err
+	}
+	return d.accounts.insertAccount(ctx, localpart, hash, appserviceID)
+}
+
+// SaveMembership saves the user matching a given localpart as a member of a given
+// room. It also stores the ID of the membership event.
+// If a membership already exists between the user and the room, or if the
+// insert fails, returns the SQL error
+func (d *Database) saveMembership(
+	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
+) error {
+	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
+}
+
+// removeMembershipsByEventIDs removes the memberships corresponding to the
+// `join` membership events IDs in the eventIDs slice.
+// If the removal fails, or if there is no membership to remove, returns an error
+func (d *Database) removeMembershipsByEventIDs(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) error {
+	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
+}
+
+// UpdateMemberships adds the "join" membership events included in a given state
+// events array, and removes those which ID is included in a given array of events
+// IDs. All of the process is run in a transaction, which commits only once/if every
+// insertion and deletion has been successfully processed.
+// Returns a SQL error if there was an issue with any part of the process
+func (d *Database) UpdateMemberships(
+	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
+			return err
+		}
+
+		for _, event := range eventsToAdd {
+			if err := d.newMembership(ctx, txn, event); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+}
+
+// GetMembershipInRoomByLocalpart returns the membership for an user
+// matching the given localpart if he is a member of the room matching roomID,
+// if not sql.ErrNoRows is returned.
+// If there was an issue during the retrieval, returns the SQL error
+func (d *Database) GetMembershipInRoomByLocalpart(
+	ctx context.Context, localpart, roomID string,
+) (authtypes.Membership, error) {
+	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
+}
+
+// GetMembershipsByLocalpart returns an array containing the memberships for all
+// the rooms a user matching a given localpart is a member of
+// If no membership match the given localpart, returns an empty array
+// If there was an issue during the retrieval, returns the SQL error
+func (d *Database) GetMembershipsByLocalpart(
+	ctx context.Context, localpart string,
+) (memberships []authtypes.Membership, err error) {
+	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
+}
+
+// newMembership saves a new membership in the database.
+// If the event isn't a valid m.room.member event with type `join`, does nothing.
+// If an error occurred, returns the SQL error
+func (d *Database) newMembership(
+	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
+) error {
+	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
+		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
+		if err != nil {
+			return err
+		}
+
+		// We only want state events from local users
+		if string(serverName) != string(d.serverName) {
+			return nil
+		}
+
+		eventID := ev.EventID()
+		roomID := ev.RoomID()
+		membership, err := ev.Membership()
+		if err != nil {
+			return err
+		}
+
+		// Only "join" membership events can be considered as new memberships
+		if membership == gomatrixserverlib.Join {
+			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// SaveAccountData saves new account data for a given user and a given room.
+// If the account data is not specific to a room, the room ID should be an empty string
+// If an account data already exists for a given set (user, room, data type), it will
+// update the corresponding row with the new content
+// Returns a SQL error if there was an issue with the insertion/update
+func (d *Database) SaveAccountData(
+	ctx context.Context, localpart, roomID, dataType, content string,
+) error {
+	return d.accountDatas.insertAccountData(ctx, localpart, roomID, dataType, content)
+}
+
+// GetAccountData returns account data related to a given localpart
+// If no account data could be found, returns an empty arrays
+// Returns an error if there was an issue with the retrieval
+func (d *Database) GetAccountData(ctx context.Context, localpart string) (
+	global []gomatrixserverlib.ClientEvent,
+	rooms map[string][]gomatrixserverlib.ClientEvent,
+	err error,
+) {
+	return d.accountDatas.selectAccountData(ctx, localpart)
+}
+
+// GetAccountDataByType returns account data matching a given
+// localpart, room ID and type.
+// If no account data could be found, returns nil
+// Returns an error if there was an issue with the retrieval
+func (d *Database) GetAccountDataByType(
+	ctx context.Context, localpart, roomID, dataType string,
+) (data *gomatrixserverlib.ClientEvent, err error) {
+	return d.accountDatas.selectAccountDataByType(
+		ctx, localpart, roomID, dataType,
+	)
+}
+
+// GetNewNumericLocalpart generates and returns a new unused numeric localpart
+func (d *Database) GetNewNumericLocalpart(
+	ctx context.Context,
+) (int64, error) {
+	return d.accounts.selectNewNumericLocalpart(ctx)
+}
+
+func hashPassword(plaintext string) (hash string, err error) {
+	hashBytes, err := bcrypt.GenerateFromPassword([]byte(plaintext), bcrypt.DefaultCost)
+	return string(hashBytes), err
+}
+
+// Err3PIDInUse is the error returned when trying to save an association involving
+// a third-party identifier which is already associated to a local user.
+var Err3PIDInUse = errors.New("This third-party identifier is already in use")
+
+// SaveThreePIDAssociation saves the association between a third party identifier
+// and a local Matrix user (identified by the user's ID's local part).
+// If the third-party identifier is already part of an association, returns Err3PIDInUse.
+// Returns an error if there was a problem talking to the database.
+func (d *Database) SaveThreePIDAssociation(
+	ctx context.Context, threepid, localpart, medium string,
+) (err error) {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		user, err := d.threepids.selectLocalpartForThreePID(
+			ctx, txn, threepid, medium,
+		)
+		if err != nil {
+			return err
+		}
+
+		if len(user) > 0 {
+			return Err3PIDInUse
+		}
+
+		return d.threepids.insertThreePID(ctx, txn, threepid, medium, localpart)
+	})
+}
+
+// RemoveThreePIDAssociation removes the association involving a given third-party
+// identifier.
+// If no association exists involving this third-party identifier, returns nothing.
+// If there was a problem talking to the database, returns an error.
+func (d *Database) RemoveThreePIDAssociation(
+	ctx context.Context, threepid string, medium string,
+) (err error) {
+	return d.threepids.deleteThreePID(ctx, threepid, medium)
+}
+
+// GetLocalpartForThreePID looks up the localpart associated with a given third-party
+// identifier.
+// If no association involves the given third-party idenfitier, returns an empty
+// string.
+// Returns an error if there was a problem talking to the database.
+func (d *Database) GetLocalpartForThreePID(
+	ctx context.Context, threepid string, medium string,
+) (localpart string, err error) {
+	return d.threepids.selectLocalpartForThreePID(ctx, nil, threepid, medium)
+}
+
+// GetThreePIDsForLocalpart looks up the third-party identifiers associated with
+// a given local user.
+// If no association is known for this user, returns an empty slice.
+// Returns an error if there was an issue talking to the database.
+func (d *Database) GetThreePIDsForLocalpart(
+	ctx context.Context, localpart string,
+) (threepids []authtypes.ThreePID, err error) {
+	return d.threepids.selectThreePIDsForLocalpart(ctx, localpart)
+}
+
+// GetFilter looks up the filter associated with a given local user and filter ID.
+// Returns a filter structure. Otherwise returns an error if no such filter exists
+// or if there was an error talking to the database.
+func (d *Database) GetFilter(
+	ctx context.Context, localpart string, filterID string,
+) (*gomatrixserverlib.Filter, error) {
+	return d.filter.selectFilter(ctx, localpart, filterID)
+}
+
+// PutFilter puts the passed filter into the database.
+// Returns the filterID as a string. Otherwise returns an error if something
+// goes wrong.
+func (d *Database) PutFilter(
+	ctx context.Context, localpart string, filter *gomatrixserverlib.Filter,
+) (string, error) {
+	return d.filter.insertFilter(ctx, filter, localpart)
+}
+
+// CheckAccountAvailability checks if the username/localpart is already present
+// in the database.
+// If the DB returns sql.ErrNoRows the Localpart isn't taken.
+func (d *Database) CheckAccountAvailability(ctx context.Context, localpart string) (bool, error) {
+	_, err := d.accounts.selectAccountByLocalpart(ctx, localpart)
+	if err == sql.ErrNoRows {
+		return true, nil
+	}
+	return false, err
+}
+
+// GetAccountByLocalpart returns the account associated with the given localpart.
+// This function assumes the request is authenticated or the account data is used only internally.
+// Returns sql.ErrNoRows if no account exists which matches the given localpart.
+func (d *Database) GetAccountByLocalpart(ctx context.Context, localpart string,
+) (*authtypes.Account, error) {
+	return d.accounts.selectAccountByLocalpart(ctx, localpart)
+}
diff --git a/clientapi/auth/storage/accounts/postgres/threepid_table.go b/clientapi/auth/storage/accounts/postgres/threepid_table.go
new file mode 100644
index 00000000..851b4a90
--- /dev/null
+++ b/clientapi/auth/storage/accounts/postgres/threepid_table.go
@@ -0,0 +1,129 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package postgres
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+)
+
+const threepidSchema = `
+-- Stores data about third party identifiers
+CREATE TABLE IF NOT EXISTS account_threepid (
+	-- The third party identifier
+	threepid TEXT NOT NULL,
+	-- The 3PID medium
+	medium TEXT NOT NULL DEFAULT 'email',
+	-- The localpart of the Matrix user ID associated to this 3PID
+	localpart TEXT NOT NULL,
+
+	PRIMARY KEY(threepid, medium)
+);
+
+CREATE INDEX IF NOT EXISTS account_threepid_localpart ON account_threepid(localpart);
+`
+
+const selectLocalpartForThreePIDSQL = "" +
+	"SELECT localpart FROM account_threepid WHERE threepid = $1 AND medium = $2"
+
+const selectThreePIDsForLocalpartSQL = "" +
+	"SELECT threepid, medium FROM account_threepid WHERE localpart = $1"
+
+const insertThreePIDSQL = "" +
+	"INSERT INTO account_threepid (threepid, medium, localpart) VALUES ($1, $2, $3)"
+
+const deleteThreePIDSQL = "" +
+	"DELETE FROM account_threepid WHERE threepid = $1 AND medium = $2"
+
+type threepidStatements struct {
+	selectLocalpartForThreePIDStmt  *sql.Stmt
+	selectThreePIDsForLocalpartStmt *sql.Stmt
+	insertThreePIDStmt              *sql.Stmt
+	deleteThreePIDStmt              *sql.Stmt
+}
+
+func (s *threepidStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(threepidSchema)
+	if err != nil {
+		return
+	}
+	if s.selectLocalpartForThreePIDStmt, err = db.Prepare(selectLocalpartForThreePIDSQL); err != nil {
+		return
+	}
+	if s.selectThreePIDsForLocalpartStmt, err = db.Prepare(selectThreePIDsForLocalpartSQL); err != nil {
+		return
+	}
+	if s.insertThreePIDStmt, err = db.Prepare(insertThreePIDSQL); err != nil {
+		return
+	}
+	if s.deleteThreePIDStmt, err = db.Prepare(deleteThreePIDSQL); err != nil {
+		return
+	}
+
+	return
+}
+
+func (s *threepidStatements) selectLocalpartForThreePID(
+	ctx context.Context, txn *sql.Tx, threepid string, medium string,
+) (localpart string, err error) {
+	stmt := common.TxStmt(txn, s.selectLocalpartForThreePIDStmt)
+	err = stmt.QueryRowContext(ctx, threepid, medium).Scan(&localpart)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return
+}
+
+func (s *threepidStatements) selectThreePIDsForLocalpart(
+	ctx context.Context, localpart string,
+) (threepids []authtypes.ThreePID, err error) {
+	rows, err := s.selectThreePIDsForLocalpartStmt.QueryContext(ctx, localpart)
+	if err != nil {
+		return
+	}
+
+	threepids = []authtypes.ThreePID{}
+	for rows.Next() {
+		var threepid string
+		var medium string
+		if err = rows.Scan(&threepid, &medium); err != nil {
+			return
+		}
+		threepids = append(threepids, authtypes.ThreePID{
+			Address: threepid,
+			Medium:  medium,
+		})
+	}
+
+	return
+}
+
+func (s *threepidStatements) insertThreePID(
+	ctx context.Context, txn *sql.Tx, threepid, medium, localpart string,
+) (err error) {
+	stmt := common.TxStmt(txn, s.insertThreePIDStmt)
+	_, err = stmt.ExecContext(ctx, threepid, medium, localpart)
+	return
+}
+
+func (s *threepidStatements) deleteThreePID(
+	ctx context.Context, threepid string, medium string) (err error) {
+	_, err = s.deleteThreePIDStmt.ExecContext(ctx, threepid, medium)
+	return
+}
diff --git a/clientapi/auth/storage/accounts/sqlite3/account_data_table.go b/clientapi/auth/storage/accounts/sqlite3/account_data_table.go
new file mode 100644
index 00000000..c2143881
--- /dev/null
+++ b/clientapi/auth/storage/accounts/sqlite3/account_data_table.go
@@ -0,0 +1,141 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const accountDataSchema = `
+-- Stores data about accounts data.
+CREATE TABLE IF NOT EXISTS account_data (
+    -- The Matrix user ID localpart for this account
+    localpart TEXT NOT NULL,
+    -- The room ID for this data (empty string if not specific to a room)
+    room_id TEXT,
+    -- The account data type
+    type TEXT NOT NULL,
+    -- The account data content
+    content TEXT NOT NULL,
+
+    PRIMARY KEY(localpart, room_id, type)
+);
+`
+
+const insertAccountDataSQL = `
+	INSERT INTO account_data(localpart, room_id, type, content) VALUES($1, $2, $3, $4)
+	ON CONFLICT (localpart, room_id, type) DO UPDATE SET content = $4
+`
+
+const selectAccountDataSQL = "" +
+	"SELECT room_id, type, content FROM account_data WHERE localpart = $1"
+
+const selectAccountDataByTypeSQL = "" +
+	"SELECT content FROM account_data WHERE localpart = $1 AND room_id = $2 AND type = $3"
+
+type accountDataStatements struct {
+	insertAccountDataStmt       *sql.Stmt
+	selectAccountDataStmt       *sql.Stmt
+	selectAccountDataByTypeStmt *sql.Stmt
+}
+
+func (s *accountDataStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(accountDataSchema)
+	if err != nil {
+		return
+	}
+	if s.insertAccountDataStmt, err = db.Prepare(insertAccountDataSQL); err != nil {
+		return
+	}
+	if s.selectAccountDataStmt, err = db.Prepare(selectAccountDataSQL); err != nil {
+		return
+	}
+	if s.selectAccountDataByTypeStmt, err = db.Prepare(selectAccountDataByTypeSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *accountDataStatements) insertAccountData(
+	ctx context.Context, localpart, roomID, dataType, content string,
+) (err error) {
+	stmt := s.insertAccountDataStmt
+	_, err = stmt.ExecContext(ctx, localpart, roomID, dataType, content)
+	return
+}
+
+func (s *accountDataStatements) selectAccountData(
+	ctx context.Context, localpart string,
+) (
+	global []gomatrixserverlib.ClientEvent,
+	rooms map[string][]gomatrixserverlib.ClientEvent,
+	err error,
+) {
+	rows, err := s.selectAccountDataStmt.QueryContext(ctx, localpart)
+	if err != nil {
+		return
+	}
+
+	global = []gomatrixserverlib.ClientEvent{}
+	rooms = make(map[string][]gomatrixserverlib.ClientEvent)
+
+	for rows.Next() {
+		var roomID string
+		var dataType string
+		var content []byte
+
+		if err = rows.Scan(&roomID, &dataType, &content); err != nil {
+			return
+		}
+
+		ac := gomatrixserverlib.ClientEvent{
+			Type:    dataType,
+			Content: content,
+		}
+
+		if len(roomID) > 0 {
+			rooms[roomID] = append(rooms[roomID], ac)
+		} else {
+			global = append(global, ac)
+		}
+	}
+
+	return
+}
+
+func (s *accountDataStatements) selectAccountDataByType(
+	ctx context.Context, localpart, roomID, dataType string,
+) (data *gomatrixserverlib.ClientEvent, err error) {
+	stmt := s.selectAccountDataByTypeStmt
+	var content []byte
+
+	if err = stmt.QueryRowContext(ctx, localpart, roomID, dataType).Scan(&content); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+
+		return
+	}
+
+	data = &gomatrixserverlib.ClientEvent{
+		Type:    dataType,
+		Content: content,
+	}
+
+	return
+}
diff --git a/clientapi/auth/storage/accounts/sqlite3/accounts_table.go b/clientapi/auth/storage/accounts/sqlite3/accounts_table.go
new file mode 100644
index 00000000..b029951f
--- /dev/null
+++ b/clientapi/auth/storage/accounts/sqlite3/accounts_table.go
@@ -0,0 +1,151 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/clientapi/userutil"
+	"github.com/matrix-org/gomatrixserverlib"
+
+	log "github.com/sirupsen/logrus"
+)
+
+const accountsSchema = `
+-- Stores data about accounts.
+CREATE TABLE IF NOT EXISTS account_accounts (
+    -- The Matrix user ID localpart for this account
+    localpart TEXT NOT NULL PRIMARY KEY,
+    -- When this account was first created, as a unix timestamp (ms resolution).
+    created_ts BIGINT NOT NULL,
+    -- The password hash for this account. Can be NULL if this is a passwordless account.
+    password_hash TEXT,
+    -- Identifies which application service this account belongs to, if any.
+    appservice_id TEXT
+    -- TODO:
+    -- is_guest, is_admin, upgraded_ts, devices, any email reset stuff?
+);
+`
+
+const insertAccountSQL = "" +
+	"INSERT INTO account_accounts(localpart, created_ts, password_hash, appservice_id) VALUES ($1, $2, $3, $4)"
+
+const selectAccountByLocalpartSQL = "" +
+	"SELECT localpart, appservice_id FROM account_accounts WHERE localpart = $1"
+
+const selectPasswordHashSQL = "" +
+	"SELECT password_hash FROM account_accounts WHERE localpart = $1"
+
+const selectNewNumericLocalpartSQL = "" +
+	"SELECT COUNT(localpart) FROM account_accounts"
+
+// TODO: Update password
+
+type accountsStatements struct {
+	insertAccountStmt             *sql.Stmt
+	selectAccountByLocalpartStmt  *sql.Stmt
+	selectPasswordHashStmt        *sql.Stmt
+	selectNewNumericLocalpartStmt *sql.Stmt
+	serverName                    gomatrixserverlib.ServerName
+}
+
+func (s *accountsStatements) prepare(db *sql.DB, server gomatrixserverlib.ServerName) (err error) {
+	_, err = db.Exec(accountsSchema)
+	if err != nil {
+		return
+	}
+	if s.insertAccountStmt, err = db.Prepare(insertAccountSQL); err != nil {
+		return
+	}
+	if s.selectAccountByLocalpartStmt, err = db.Prepare(selectAccountByLocalpartSQL); err != nil {
+		return
+	}
+	if s.selectPasswordHashStmt, err = db.Prepare(selectPasswordHashSQL); err != nil {
+		return
+	}
+	if s.selectNewNumericLocalpartStmt, err = db.Prepare(selectNewNumericLocalpartSQL); err != nil {
+		return
+	}
+	s.serverName = server
+	return
+}
+
+// insertAccount creates a new account. 'hash' should be the password hash for this account. If it is missing,
+// this account will be passwordless. Returns an error if this account already exists. Returns the account
+// on success.
+func (s *accountsStatements) insertAccount(
+	ctx context.Context, localpart, hash, appserviceID string,
+) (*authtypes.Account, error) {
+	createdTimeMS := time.Now().UnixNano() / 1000000
+	stmt := s.insertAccountStmt
+
+	var err error
+	if appserviceID == "" {
+		_, err = stmt.ExecContext(ctx, localpart, createdTimeMS, hash, nil)
+	} else {
+		_, err = stmt.ExecContext(ctx, localpart, createdTimeMS, hash, appserviceID)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return &authtypes.Account{
+		Localpart:    localpart,
+		UserID:       userutil.MakeUserID(localpart, s.serverName),
+		ServerName:   s.serverName,
+		AppServiceID: appserviceID,
+	}, nil
+}
+
+func (s *accountsStatements) selectPasswordHash(
+	ctx context.Context, localpart string,
+) (hash string, err error) {
+	err = s.selectPasswordHashStmt.QueryRowContext(ctx, localpart).Scan(&hash)
+	return
+}
+
+func (s *accountsStatements) selectAccountByLocalpart(
+	ctx context.Context, localpart string,
+) (*authtypes.Account, error) {
+	var appserviceIDPtr sql.NullString
+	var acc authtypes.Account
+
+	stmt := s.selectAccountByLocalpartStmt
+	err := stmt.QueryRowContext(ctx, localpart).Scan(&acc.Localpart, &appserviceIDPtr)
+	if err != nil {
+		if err != sql.ErrNoRows {
+			log.WithError(err).Error("Unable to retrieve user from the db")
+		}
+		return nil, err
+	}
+	if appserviceIDPtr.Valid {
+		acc.AppServiceID = appserviceIDPtr.String
+	}
+
+	acc.UserID = userutil.MakeUserID(localpart, s.serverName)
+	acc.ServerName = s.serverName
+
+	return &acc, nil
+}
+
+func (s *accountsStatements) selectNewNumericLocalpart(
+	ctx context.Context,
+) (id int64, err error) {
+	err = s.selectNewNumericLocalpartStmt.QueryRowContext(ctx).Scan(&id)
+	return
+}
diff --git a/clientapi/auth/storage/accounts/sqlite3/filter_table.go b/clientapi/auth/storage/accounts/sqlite3/filter_table.go
new file mode 100644
index 00000000..691ead77
--- /dev/null
+++ b/clientapi/auth/storage/accounts/sqlite3/filter_table.go
@@ -0,0 +1,139 @@
+// Copyright 2017 Jan Christian Grünhage
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const filterSchema = `
+-- Stores data about filters
+CREATE TABLE IF NOT EXISTS account_filter (
+	-- The filter
+	filter TEXT NOT NULL,
+	-- The ID
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	-- The localpart of the Matrix user ID associated to this filter
+	localpart TEXT NOT NULL,
+
+	UNIQUE (id, localpart)
+);
+
+CREATE INDEX IF NOT EXISTS account_filter_localpart ON account_filter(localpart);
+`
+
+const selectFilterSQL = "" +
+	"SELECT filter FROM account_filter WHERE localpart = $1 AND id = $2"
+
+const selectFilterIDByContentSQL = "" +
+	"SELECT id FROM account_filter WHERE localpart = $1 AND filter = $2"
+
+const insertFilterSQL = "" +
+	"INSERT INTO account_filter (filter, localpart) VALUES ($1, $2)"
+
+const selectLastInsertedFilterIDSQL = "" +
+	"SELECT id FROM account_filter WHERE rowid = last_insert_rowid()"
+
+type filterStatements struct {
+	selectFilterStmt               *sql.Stmt
+	selectLastInsertedFilterIDStmt *sql.Stmt
+	selectFilterIDByContentStmt    *sql.Stmt
+	insertFilterStmt               *sql.Stmt
+}
+
+func (s *filterStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(filterSchema)
+	if err != nil {
+		return
+	}
+	if s.selectFilterStmt, err = db.Prepare(selectFilterSQL); err != nil {
+		return
+	}
+	if s.selectLastInsertedFilterIDStmt, err = db.Prepare(selectLastInsertedFilterIDSQL); err != nil {
+		return
+	}
+	if s.selectFilterIDByContentStmt, err = db.Prepare(selectFilterIDByContentSQL); err != nil {
+		return
+	}
+	if s.insertFilterStmt, err = db.Prepare(insertFilterSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *filterStatements) selectFilter(
+	ctx context.Context, localpart string, filterID string,
+) (*gomatrixserverlib.Filter, error) {
+	// Retrieve filter from database (stored as canonical JSON)
+	var filterData []byte
+	err := s.selectFilterStmt.QueryRowContext(ctx, localpart, filterID).Scan(&filterData)
+	if err != nil {
+		return nil, err
+	}
+
+	// Unmarshal JSON into Filter struct
+	var filter gomatrixserverlib.Filter
+	if err = json.Unmarshal(filterData, &filter); err != nil {
+		return nil, err
+	}
+	return &filter, nil
+}
+
+func (s *filterStatements) insertFilter(
+	ctx context.Context, filter *gomatrixserverlib.Filter, localpart string,
+) (filterID string, err error) {
+	var existingFilterID string
+
+	// Serialise json
+	filterJSON, err := json.Marshal(filter)
+	if err != nil {
+		return "", err
+	}
+	// Remove whitespaces and sort JSON data
+	// needed to prevent from inserting the same filter multiple times
+	filterJSON, err = gomatrixserverlib.CanonicalJSON(filterJSON)
+	if err != nil {
+		return "", err
+	}
+
+	// Check if filter already exists in the database using its localpart and content
+	//
+	// This can result in a race condition when two clients try to insert the
+	// same filter and localpart at the same time, however this is not a
+	// problem as both calls will result in the same filterID
+	err = s.selectFilterIDByContentStmt.QueryRowContext(ctx,
+		localpart, filterJSON).Scan(&existingFilterID)
+	if err != nil && err != sql.ErrNoRows {
+		return "", err
+	}
+	// If it does, return the existing ID
+	if existingFilterID != "" {
+		return existingFilterID, err
+	}
+
+	// Otherwise insert the filter and return the new ID
+	if _, err = s.insertFilterStmt.ExecContext(ctx, filterJSON, localpart); err != nil {
+		return "", err
+	}
+	row := s.selectLastInsertedFilterIDStmt.QueryRowContext(ctx)
+	if err := row.Scan(&filterID); err != nil {
+		return "", err
+	}
+	return
+}
diff --git a/clientapi/auth/storage/accounts/sqlite3/membership_table.go b/clientapi/auth/storage/accounts/sqlite3/membership_table.go
new file mode 100644
index 00000000..8e5e69ba
--- /dev/null
+++ b/clientapi/auth/storage/accounts/sqlite3/membership_table.go
@@ -0,0 +1,131 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+)
+
+const membershipSchema = `
+-- Stores data about users memberships to rooms.
+CREATE TABLE IF NOT EXISTS account_memberships (
+    -- The Matrix user ID localpart for the member
+    localpart TEXT NOT NULL,
+    -- The room this user is a member of
+    room_id TEXT NOT NULL,
+    -- The ID of the join membership event
+    event_id TEXT NOT NULL,
+
+    -- A user can only be member of a room once
+    PRIMARY KEY (localpart, room_id),
+
+		UNIQUE (event_id)
+);
+`
+
+const insertMembershipSQL = `
+	INSERT INTO account_memberships(localpart, room_id, event_id) VALUES ($1, $2, $3)
+	ON CONFLICT (localpart, room_id) DO UPDATE SET event_id = EXCLUDED.event_id
+`
+
+const selectMembershipsByLocalpartSQL = "" +
+	"SELECT room_id, event_id FROM account_memberships WHERE localpart = $1"
+
+const selectMembershipInRoomByLocalpartSQL = "" +
+	"SELECT event_id FROM account_memberships WHERE localpart = $1 AND room_id = $2"
+
+const deleteMembershipsByEventIDsSQL = "" +
+	"DELETE FROM account_memberships WHERE event_id IN ($1)"
+
+type membershipStatements struct {
+	deleteMembershipsByEventIDsStmt       *sql.Stmt
+	insertMembershipStmt                  *sql.Stmt
+	selectMembershipInRoomByLocalpartStmt *sql.Stmt
+	selectMembershipsByLocalpartStmt      *sql.Stmt
+}
+
+func (s *membershipStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(membershipSchema)
+	if err != nil {
+		return
+	}
+	if s.deleteMembershipsByEventIDsStmt, err = db.Prepare(deleteMembershipsByEventIDsSQL); err != nil {
+		return
+	}
+	if s.insertMembershipStmt, err = db.Prepare(insertMembershipSQL); err != nil {
+		return
+	}
+	if s.selectMembershipInRoomByLocalpartStmt, err = db.Prepare(selectMembershipInRoomByLocalpartSQL); err != nil {
+		return
+	}
+	if s.selectMembershipsByLocalpartStmt, err = db.Prepare(selectMembershipsByLocalpartSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *membershipStatements) insertMembership(
+	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
+) (err error) {
+	stmt := txn.Stmt(s.insertMembershipStmt)
+	_, err = stmt.ExecContext(ctx, localpart, roomID, eventID)
+	return
+}
+
+func (s *membershipStatements) deleteMembershipsByEventIDs(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) (err error) {
+	stmt := txn.Stmt(s.deleteMembershipsByEventIDsStmt)
+	_, err = stmt.ExecContext(ctx, pq.StringArray(eventIDs))
+	return
+}
+
+func (s *membershipStatements) selectMembershipInRoomByLocalpart(
+	ctx context.Context, localpart, roomID string,
+) (authtypes.Membership, error) {
+	membership := authtypes.Membership{Localpart: localpart, RoomID: roomID}
+	stmt := s.selectMembershipInRoomByLocalpartStmt
+	err := stmt.QueryRowContext(ctx, localpart, roomID).Scan(&membership.EventID)
+
+	return membership, err
+}
+
+func (s *membershipStatements) selectMembershipsByLocalpart(
+	ctx context.Context, localpart string,
+) (memberships []authtypes.Membership, err error) {
+	stmt := s.selectMembershipsByLocalpartStmt
+	rows, err := stmt.QueryContext(ctx, localpart)
+	if err != nil {
+		return
+	}
+
+	memberships = []authtypes.Membership{}
+
+	defer rows.Close() // nolint: errcheck
+	for rows.Next() {
+		var m authtypes.Membership
+		m.Localpart = localpart
+		if err := rows.Scan(&m.RoomID, &m.EventID); err != nil {
+			return nil, err
+		}
+		memberships = append(memberships, m)
+	}
+
+	return
+}
diff --git a/clientapi/auth/storage/accounts/sqlite3/profile_table.go b/clientapi/auth/storage/accounts/sqlite3/profile_table.go
new file mode 100644
index 00000000..7af8307e
--- /dev/null
+++ b/clientapi/auth/storage/accounts/sqlite3/profile_table.go
@@ -0,0 +1,107 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+)
+
+const profilesSchema = `
+-- Stores data about accounts profiles.
+CREATE TABLE IF NOT EXISTS account_profiles (
+    -- The Matrix user ID localpart for this account
+    localpart TEXT NOT NULL PRIMARY KEY,
+    -- The display name for this account
+    display_name TEXT,
+    -- The URL of the avatar for this account
+    avatar_url TEXT
+);
+`
+
+const insertProfileSQL = "" +
+	"INSERT INTO account_profiles(localpart, display_name, avatar_url) VALUES ($1, $2, $3)"
+
+const selectProfileByLocalpartSQL = "" +
+	"SELECT localpart, display_name, avatar_url FROM account_profiles WHERE localpart = $1"
+
+const setAvatarURLSQL = "" +
+	"UPDATE account_profiles SET avatar_url = $1 WHERE localpart = $2"
+
+const setDisplayNameSQL = "" +
+	"UPDATE account_profiles SET display_name = $1 WHERE localpart = $2"
+
+type profilesStatements struct {
+	insertProfileStmt            *sql.Stmt
+	selectProfileByLocalpartStmt *sql.Stmt
+	setAvatarURLStmt             *sql.Stmt
+	setDisplayNameStmt           *sql.Stmt
+}
+
+func (s *profilesStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(profilesSchema)
+	if err != nil {
+		return
+	}
+	if s.insertProfileStmt, err = db.Prepare(insertProfileSQL); err != nil {
+		return
+	}
+	if s.selectProfileByLocalpartStmt, err = db.Prepare(selectProfileByLocalpartSQL); err != nil {
+		return
+	}
+	if s.setAvatarURLStmt, err = db.Prepare(setAvatarURLSQL); err != nil {
+		return
+	}
+	if s.setDisplayNameStmt, err = db.Prepare(setDisplayNameSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *profilesStatements) insertProfile(
+	ctx context.Context, localpart string,
+) (err error) {
+	_, err = s.insertProfileStmt.ExecContext(ctx, localpart, "", "")
+	return
+}
+
+func (s *profilesStatements) selectProfileByLocalpart(
+	ctx context.Context, localpart string,
+) (*authtypes.Profile, error) {
+	var profile authtypes.Profile
+	err := s.selectProfileByLocalpartStmt.QueryRowContext(ctx, localpart).Scan(
+		&profile.Localpart, &profile.DisplayName, &profile.AvatarURL,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &profile, nil
+}
+
+func (s *profilesStatements) setAvatarURL(
+	ctx context.Context, localpart string, avatarURL string,
+) (err error) {
+	_, err = s.setAvatarURLStmt.ExecContext(ctx, avatarURL, localpart)
+	return
+}
+
+func (s *profilesStatements) setDisplayName(
+	ctx context.Context, localpart string, displayName string,
+) (err error) {
+	_, err = s.setDisplayNameStmt.ExecContext(ctx, displayName, localpart)
+	return
+}
diff --git a/clientapi/auth/storage/accounts/sqlite3/storage.go b/clientapi/auth/storage/accounts/sqlite3/storage.go
new file mode 100644
index 00000000..199c4606
--- /dev/null
+++ b/clientapi/auth/storage/accounts/sqlite3/storage.go
@@ -0,0 +1,392 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/gomatrixserverlib"
+	"golang.org/x/crypto/bcrypt"
+
+	// Import the postgres database driver.
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// Database represents an account database
+type Database struct {
+	db *sql.DB
+	common.PartitionOffsetStatements
+	accounts     accountsStatements
+	profiles     profilesStatements
+	memberships  membershipStatements
+	accountDatas accountDataStatements
+	threepids    threepidStatements
+	filter       filterStatements
+	serverName   gomatrixserverlib.ServerName
+}
+
+// NewDatabase creates a new accounts and profiles database
+func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (*Database, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	partitions := common.PartitionOffsetStatements{}
+	if err = partitions.Prepare(db, "account"); err != nil {
+		return nil, err
+	}
+	a := accountsStatements{}
+	if err = a.prepare(db, serverName); err != nil {
+		return nil, err
+	}
+	p := profilesStatements{}
+	if err = p.prepare(db); err != nil {
+		return nil, err
+	}
+	m := membershipStatements{}
+	if err = m.prepare(db); err != nil {
+		return nil, err
+	}
+	ac := accountDataStatements{}
+	if err = ac.prepare(db); err != nil {
+		return nil, err
+	}
+	t := threepidStatements{}
+	if err = t.prepare(db); err != nil {
+		return nil, err
+	}
+	f := filterStatements{}
+	if err = f.prepare(db); err != nil {
+		return nil, err
+	}
+	return &Database{db, partitions, a, p, m, ac, t, f, serverName}, nil
+}
+
+// GetAccountByPassword returns the account associated with the given localpart and password.
+// Returns sql.ErrNoRows if no account exists which matches the given localpart.
+func (d *Database) GetAccountByPassword(
+	ctx context.Context, localpart, plaintextPassword string,
+) (*authtypes.Account, error) {
+	hash, err := d.accounts.selectPasswordHash(ctx, localpart)
+	if err != nil {
+		return nil, err
+	}
+	if err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(plaintextPassword)); err != nil {
+		return nil, err
+	}
+	return d.accounts.selectAccountByLocalpart(ctx, localpart)
+}
+
+// GetProfileByLocalpart returns the profile associated with the given localpart.
+// Returns sql.ErrNoRows if no profile exists which matches the given localpart.
+func (d *Database) GetProfileByLocalpart(
+	ctx context.Context, localpart string,
+) (*authtypes.Profile, error) {
+	return d.profiles.selectProfileByLocalpart(ctx, localpart)
+}
+
+// SetAvatarURL updates the avatar URL of the profile associated with the given
+// localpart. Returns an error if something went wrong with the SQL query
+func (d *Database) SetAvatarURL(
+	ctx context.Context, localpart string, avatarURL string,
+) error {
+	return d.profiles.setAvatarURL(ctx, localpart, avatarURL)
+}
+
+// SetDisplayName updates the display name of the profile associated with the given
+// localpart. Returns an error if something went wrong with the SQL query
+func (d *Database) SetDisplayName(
+	ctx context.Context, localpart string, displayName string,
+) error {
+	return d.profiles.setDisplayName(ctx, localpart, displayName)
+}
+
+// CreateAccount makes a new account with the given login name and password, and creates an empty profile
+// for this account. If no password is supplied, the account will be a passwordless account. If the
+// account already exists, it will return nil, nil.
+func (d *Database) CreateAccount(
+	ctx context.Context, localpart, plaintextPassword, appserviceID string,
+) (*authtypes.Account, error) {
+	var err error
+
+	// Generate a password hash if this is not a password-less user
+	hash := ""
+	if plaintextPassword != "" {
+		hash, err = hashPassword(plaintextPassword)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if err := d.profiles.insertProfile(ctx, localpart); err != nil {
+		if common.IsUniqueConstraintViolationErr(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	if err := d.SaveAccountData(ctx, localpart, "", "m.push_rules", `{
+		"global": {
+			"content": [],
+			"override": [],
+			"room": [],
+			"sender": [],
+			"underride": []
+		}
+	}`); err != nil {
+		return nil, err
+	}
+	return d.accounts.insertAccount(ctx, localpart, hash, appserviceID)
+}
+
+// SaveMembership saves the user matching a given localpart as a member of a given
+// room. It also stores the ID of the membership event.
+// If a membership already exists between the user and the room, or if the
+// insert fails, returns the SQL error
+func (d *Database) saveMembership(
+	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
+) error {
+	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
+}
+
+// removeMembershipsByEventIDs removes the memberships corresponding to the
+// `join` membership events IDs in the eventIDs slice.
+// If the removal fails, or if there is no membership to remove, returns an error
+func (d *Database) removeMembershipsByEventIDs(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) error {
+	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
+}
+
+// UpdateMemberships adds the "join" membership events included in a given state
+// events array, and removes those which ID is included in a given array of events
+// IDs. All of the process is run in a transaction, which commits only once/if every
+// insertion and deletion has been successfully processed.
+// Returns a SQL error if there was an issue with any part of the process
+func (d *Database) UpdateMemberships(
+	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
+			return err
+		}
+
+		for _, event := range eventsToAdd {
+			if err := d.newMembership(ctx, txn, event); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+}
+
+// GetMembershipInRoomByLocalpart returns the membership for an user
+// matching the given localpart if he is a member of the room matching roomID,
+// if not sql.ErrNoRows is returned.
+// If there was an issue during the retrieval, returns the SQL error
+func (d *Database) GetMembershipInRoomByLocalpart(
+	ctx context.Context, localpart, roomID string,
+) (authtypes.Membership, error) {
+	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
+}
+
+// GetMembershipsByLocalpart returns an array containing the memberships for all
+// the rooms a user matching a given localpart is a member of
+// If no membership match the given localpart, returns an empty array
+// If there was an issue during the retrieval, returns the SQL error
+func (d *Database) GetMembershipsByLocalpart(
+	ctx context.Context, localpart string,
+) (memberships []authtypes.Membership, err error) {
+	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
+}
+
+// newMembership saves a new membership in the database.
+// If the event isn't a valid m.room.member event with type `join`, does nothing.
+// If an error occurred, returns the SQL error
+func (d *Database) newMembership(
+	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
+) error {
+	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
+		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
+		if err != nil {
+			return err
+		}
+
+		// We only want state events from local users
+		if string(serverName) != string(d.serverName) {
+			return nil
+		}
+
+		eventID := ev.EventID()
+		roomID := ev.RoomID()
+		membership, err := ev.Membership()
+		if err != nil {
+			return err
+		}
+
+		// Only "join" membership events can be considered as new memberships
+		if membership == gomatrixserverlib.Join {
+			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// SaveAccountData saves new account data for a given user and a given room.
+// If the account data is not specific to a room, the room ID should be an empty string
+// If an account data already exists for a given set (user, room, data type), it will
+// update the corresponding row with the new content
+// Returns a SQL error if there was an issue with the insertion/update
+func (d *Database) SaveAccountData(
+	ctx context.Context, localpart, roomID, dataType, content string,
+) error {
+	return d.accountDatas.insertAccountData(ctx, localpart, roomID, dataType, content)
+}
+
+// GetAccountData returns account data related to a given localpart
+// If no account data could be found, returns an empty arrays
+// Returns an error if there was an issue with the retrieval
+func (d *Database) GetAccountData(ctx context.Context, localpart string) (
+	global []gomatrixserverlib.ClientEvent,
+	rooms map[string][]gomatrixserverlib.ClientEvent,
+	err error,
+) {
+	return d.accountDatas.selectAccountData(ctx, localpart)
+}
+
+// GetAccountDataByType returns account data matching a given
+// localpart, room ID and type.
+// If no account data could be found, returns nil
+// Returns an error if there was an issue with the retrieval
+func (d *Database) GetAccountDataByType(
+	ctx context.Context, localpart, roomID, dataType string,
+) (data *gomatrixserverlib.ClientEvent, err error) {
+	return d.accountDatas.selectAccountDataByType(
+		ctx, localpart, roomID, dataType,
+	)
+}
+
+// GetNewNumericLocalpart generates and returns a new unused numeric localpart
+func (d *Database) GetNewNumericLocalpart(
+	ctx context.Context,
+) (int64, error) {
+	return d.accounts.selectNewNumericLocalpart(ctx)
+}
+
+func hashPassword(plaintext string) (hash string, err error) {
+	hashBytes, err := bcrypt.GenerateFromPassword([]byte(plaintext), bcrypt.DefaultCost)
+	return string(hashBytes), err
+}
+
+// Err3PIDInUse is the error returned when trying to save an association involving
+// a third-party identifier which is already associated to a local user.
+var Err3PIDInUse = errors.New("This third-party identifier is already in use")
+
+// SaveThreePIDAssociation saves the association between a third party identifier
+// and a local Matrix user (identified by the user's ID's local part).
+// If the third-party identifier is already part of an association, returns Err3PIDInUse.
+// Returns an error if there was a problem talking to the database.
+func (d *Database) SaveThreePIDAssociation(
+	ctx context.Context, threepid, localpart, medium string,
+) (err error) {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		user, err := d.threepids.selectLocalpartForThreePID(
+			ctx, txn, threepid, medium,
+		)
+		if err != nil {
+			return err
+		}
+
+		if len(user) > 0 {
+			return Err3PIDInUse
+		}
+
+		return d.threepids.insertThreePID(ctx, txn, threepid, medium, localpart)
+	})
+}
+
+// RemoveThreePIDAssociation removes the association involving a given third-party
+// identifier.
+// If no association exists involving this third-party identifier, returns nothing.
+// If there was a problem talking to the database, returns an error.
+func (d *Database) RemoveThreePIDAssociation(
+	ctx context.Context, threepid string, medium string,
+) (err error) {
+	return d.threepids.deleteThreePID(ctx, threepid, medium)
+}
+
+// GetLocalpartForThreePID looks up the localpart associated with a given third-party
+// identifier.
+// If no association involves the given third-party idenfitier, returns an empty
+// string.
+// Returns an error if there was a problem talking to the database.
+func (d *Database) GetLocalpartForThreePID(
+	ctx context.Context, threepid string, medium string,
+) (localpart string, err error) {
+	return d.threepids.selectLocalpartForThreePID(ctx, nil, threepid, medium)
+}
+
+// GetThreePIDsForLocalpart looks up the third-party identifiers associated with
+// a given local user.
+// If no association is known for this user, returns an empty slice.
+// Returns an error if there was an issue talking to the database.
+func (d *Database) GetThreePIDsForLocalpart(
+	ctx context.Context, localpart string,
+) (threepids []authtypes.ThreePID, err error) {
+	return d.threepids.selectThreePIDsForLocalpart(ctx, localpart)
+}
+
+// GetFilter looks up the filter associated with a given local user and filter ID.
+// Returns a filter structure. Otherwise returns an error if no such filter exists
+// or if there was an error talking to the database.
+func (d *Database) GetFilter(
+	ctx context.Context, localpart string, filterID string,
+) (*gomatrixserverlib.Filter, error) {
+	return d.filter.selectFilter(ctx, localpart, filterID)
+}
+
+// PutFilter puts the passed filter into the database.
+// Returns the filterID as a string. Otherwise returns an error if something
+// goes wrong.
+func (d *Database) PutFilter(
+	ctx context.Context, localpart string, filter *gomatrixserverlib.Filter,
+) (string, error) {
+	return d.filter.insertFilter(ctx, filter, localpart)
+}
+
+// CheckAccountAvailability checks if the username/localpart is already present
+// in the database.
+// If the DB returns sql.ErrNoRows the Localpart isn't taken.
+func (d *Database) CheckAccountAvailability(ctx context.Context, localpart string) (bool, error) {
+	_, err := d.accounts.selectAccountByLocalpart(ctx, localpart)
+	if err == sql.ErrNoRows {
+		return true, nil
+	}
+	return false, err
+}
+
+// GetAccountByLocalpart returns the account associated with the given localpart.
+// This function assumes the request is authenticated or the account data is used only internally.
+// Returns sql.ErrNoRows if no account exists which matches the given localpart.
+func (d *Database) GetAccountByLocalpart(ctx context.Context, localpart string,
+) (*authtypes.Account, error) {
+	return d.accounts.selectAccountByLocalpart(ctx, localpart)
+}
diff --git a/clientapi/auth/storage/accounts/threepid_table.go b/clientapi/auth/storage/accounts/sqlite3/threepid_table.go
index a03aa4f8..53f6408d 100644
--- a/clientapi/auth/storage/accounts/threepid_table.go
+++ b/clientapi/auth/storage/accounts/sqlite3/threepid_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package accounts
+package sqlite3
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/accounts/storage.go b/clientapi/auth/storage/accounts/storage.go
index 7cfc63c0..1dfd5f1f 100644
--- a/clientapi/auth/storage/accounts/storage.go
+++ b/clientapi/auth/storage/accounts/storage.go
@@ -1,392 +1,56 @@
-// Copyright 2017 Vector Creations Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package accounts
 
 import (
 	"context"
-	"database/sql"
 	"errors"
+	"net/url"
 
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/postgres"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/sqlite3"
 	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/gomatrixserverlib"
-	"golang.org/x/crypto/bcrypt"
-
-	// Import the postgres database driver.
-	_ "github.com/lib/pq"
 )
 
-// Database represents an account database
-type Database struct {
-	db *sql.DB
-	common.PartitionOffsetStatements
-	accounts     accountsStatements
-	profiles     profilesStatements
-	memberships  membershipStatements
-	accountDatas accountDataStatements
-	threepids    threepidStatements
-	filter       filterStatements
-	serverName   gomatrixserverlib.ServerName
-}
-
-// NewDatabase creates a new accounts and profiles database
-func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (*Database, error) {
-	var db *sql.DB
-	var err error
-	if db, err = sql.Open("postgres", dataSourceName); err != nil {
-		return nil, err
-	}
-	partitions := common.PartitionOffsetStatements{}
-	if err = partitions.Prepare(db, "account"); err != nil {
-		return nil, err
-	}
-	a := accountsStatements{}
-	if err = a.prepare(db, serverName); err != nil {
-		return nil, err
-	}
-	p := profilesStatements{}
-	if err = p.prepare(db); err != nil {
-		return nil, err
-	}
-	m := membershipStatements{}
-	if err = m.prepare(db); err != nil {
-		return nil, err
-	}
-	ac := accountDataStatements{}
-	if err = ac.prepare(db); err != nil {
-		return nil, err
-	}
-	t := threepidStatements{}
-	if err = t.prepare(db); err != nil {
-		return nil, err
-	}
-	f := filterStatements{}
-	if err = f.prepare(db); err != nil {
-		return nil, err
-	}
-	return &Database{db, partitions, a, p, m, ac, t, f, serverName}, nil
-}
-
-// GetAccountByPassword returns the account associated with the given localpart and password.
-// Returns sql.ErrNoRows if no account exists which matches the given localpart.
-func (d *Database) GetAccountByPassword(
-	ctx context.Context, localpart, plaintextPassword string,
-) (*authtypes.Account, error) {
-	hash, err := d.accounts.selectPasswordHash(ctx, localpart)
+type Database interface {
+	common.PartitionStorer
+	GetAccountByPassword(ctx context.Context, localpart, plaintextPassword string) (*authtypes.Account, error)
+	GetProfileByLocalpart(ctx context.Context, localpart string) (*authtypes.Profile, error)
+	SetAvatarURL(ctx context.Context, localpart string, avatarURL string) error
+	SetDisplayName(ctx context.Context, localpart string, displayName string) error
+	CreateAccount(ctx context.Context, localpart, plaintextPassword, appserviceID string) (*authtypes.Account, error)
+	UpdateMemberships(ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string) error
+	GetMembershipInRoomByLocalpart(ctx context.Context, localpart, roomID string) (authtypes.Membership, error)
+	GetMembershipsByLocalpart(ctx context.Context, localpart string) (memberships []authtypes.Membership, err error)
+	SaveAccountData(ctx context.Context, localpart, roomID, dataType, content string) error
+	GetAccountData(ctx context.Context, localpart string) (global []gomatrixserverlib.ClientEvent, rooms map[string][]gomatrixserverlib.ClientEvent, err error)
+	GetAccountDataByType(ctx context.Context, localpart, roomID, dataType string) (data *gomatrixserverlib.ClientEvent, err error)
+	GetNewNumericLocalpart(ctx context.Context) (int64, error)
+	SaveThreePIDAssociation(ctx context.Context, threepid, localpart, medium string) (err error)
+	RemoveThreePIDAssociation(ctx context.Context, threepid string, medium string) (err error)
+	GetLocalpartForThreePID(ctx context.Context, threepid string, medium string) (localpart string, err error)
+	GetThreePIDsForLocalpart(ctx context.Context, localpart string) (threepids []authtypes.ThreePID, err error)
+	GetFilter(ctx context.Context, localpart string, filterID string) (*gomatrixserverlib.Filter, error)
+	PutFilter(ctx context.Context, localpart string, filter *gomatrixserverlib.Filter) (string, error)
+	CheckAccountAvailability(ctx context.Context, localpart string) (bool, error)
+	GetAccountByLocalpart(ctx context.Context, localpart string) (*authtypes.Account, error)
+}
+
+func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
 	if err != nil {
-		return nil, err
+		return postgres.NewDatabase(dataSourceName, serverName)
 	}
-	if err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(plaintextPassword)); err != nil {
-		return nil, err
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewDatabase(dataSourceName, serverName)
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName, serverName)
+	default:
+		return postgres.NewDatabase(dataSourceName, serverName)
 	}
-	return d.accounts.selectAccountByLocalpart(ctx, localpart)
-}
-
-// GetProfileByLocalpart returns the profile associated with the given localpart.
-// Returns sql.ErrNoRows if no profile exists which matches the given localpart.
-func (d *Database) GetProfileByLocalpart(
-	ctx context.Context, localpart string,
-) (*authtypes.Profile, error) {
-	return d.profiles.selectProfileByLocalpart(ctx, localpart)
-}
-
-// SetAvatarURL updates the avatar URL of the profile associated with the given
-// localpart. Returns an error if something went wrong with the SQL query
-func (d *Database) SetAvatarURL(
-	ctx context.Context, localpart string, avatarURL string,
-) error {
-	return d.profiles.setAvatarURL(ctx, localpart, avatarURL)
-}
-
-// SetDisplayName updates the display name of the profile associated with the given
-// localpart. Returns an error if something went wrong with the SQL query
-func (d *Database) SetDisplayName(
-	ctx context.Context, localpart string, displayName string,
-) error {
-	return d.profiles.setDisplayName(ctx, localpart, displayName)
-}
-
-// CreateAccount makes a new account with the given login name and password, and creates an empty profile
-// for this account. If no password is supplied, the account will be a passwordless account. If the
-// account already exists, it will return nil, nil.
-func (d *Database) CreateAccount(
-	ctx context.Context, localpart, plaintextPassword, appserviceID string,
-) (*authtypes.Account, error) {
-	var err error
-
-	// Generate a password hash if this is not a password-less user
-	hash := ""
-	if plaintextPassword != "" {
-		hash, err = hashPassword(plaintextPassword)
-		if err != nil {
-			return nil, err
-		}
-	}
-	if err := d.profiles.insertProfile(ctx, localpart); err != nil {
-		if common.IsUniqueConstraintViolationErr(err) {
-			return nil, nil
-		}
-		return nil, err
-	}
-	if err := d.SaveAccountData(ctx, localpart, "", "m.push_rules", `{
-		"global": {
-			"content": [],
-			"override": [],
-			"room": [],
-			"sender": [],
-			"underride": []
-		}
-	}`); err != nil {
-		return nil, err
-	}
-	return d.accounts.insertAccount(ctx, localpart, hash, appserviceID)
-}
-
-// SaveMembership saves the user matching a given localpart as a member of a given
-// room. It also stores the ID of the membership event.
-// If a membership already exists between the user and the room, or if the
-// insert fails, returns the SQL error
-func (d *Database) saveMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) error {
-	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
-}
-
-// removeMembershipsByEventIDs removes the memberships corresponding to the
-// `join` membership events IDs in the eventIDs slice.
-// If the removal fails, or if there is no membership to remove, returns an error
-func (d *Database) removeMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) error {
-	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
-}
-
-// UpdateMemberships adds the "join" membership events included in a given state
-// events array, and removes those which ID is included in a given array of events
-// IDs. All of the process is run in a transaction, which commits only once/if every
-// insertion and deletion has been successfully processed.
-// Returns a SQL error if there was an issue with any part of the process
-func (d *Database) UpdateMemberships(
-	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
-) error {
-	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
-			return err
-		}
-
-		for _, event := range eventsToAdd {
-			if err := d.newMembership(ctx, txn, event); err != nil {
-				return err
-			}
-		}
-
-		return nil
-	})
-}
-
-// GetMembershipInRoomByLocalpart returns the membership for an user
-// matching the given localpart if he is a member of the room matching roomID,
-// if not sql.ErrNoRows is returned.
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
-}
-
-// GetMembershipsByLocalpart returns an array containing the memberships for all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
-}
-
-// newMembership saves a new membership in the database.
-// If the event isn't a valid m.room.member event with type `join`, does nothing.
-// If an error occurred, returns the SQL error
-func (d *Database) newMembership(
-	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
-) error {
-	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
-		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
-		if err != nil {
-			return err
-		}
-
-		// We only want state events from local users
-		if string(serverName) != string(d.serverName) {
-			return nil
-		}
-
-		eventID := ev.EventID()
-		roomID := ev.RoomID()
-		membership, err := ev.Membership()
-		if err != nil {
-			return err
-		}
-
-		// Only "join" membership events can be considered as new memberships
-		if membership == gomatrixserverlib.Join {
-			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
-// SaveAccountData saves new account data for a given user and a given room.
-// If the account data is not specific to a room, the room ID should be an empty string
-// If an account data already exists for a given set (user, room, data type), it will
-// update the corresponding row with the new content
-// Returns a SQL error if there was an issue with the insertion/update
-func (d *Database) SaveAccountData(
-	ctx context.Context, localpart, roomID, dataType, content string,
-) error {
-	return d.accountDatas.insertAccountData(ctx, localpart, roomID, dataType, content)
-}
-
-// GetAccountData returns account data related to a given localpart
-// If no account data could be found, returns an empty arrays
-// Returns an error if there was an issue with the retrieval
-func (d *Database) GetAccountData(ctx context.Context, localpart string) (
-	global []gomatrixserverlib.ClientEvent,
-	rooms map[string][]gomatrixserverlib.ClientEvent,
-	err error,
-) {
-	return d.accountDatas.selectAccountData(ctx, localpart)
-}
-
-// GetAccountDataByType returns account data matching a given
-// localpart, room ID and type.
-// If no account data could be found, returns nil
-// Returns an error if there was an issue with the retrieval
-func (d *Database) GetAccountDataByType(
-	ctx context.Context, localpart, roomID, dataType string,
-) (data *gomatrixserverlib.ClientEvent, err error) {
-	return d.accountDatas.selectAccountDataByType(
-		ctx, localpart, roomID, dataType,
-	)
-}
-
-// GetNewNumericLocalpart generates and returns a new unused numeric localpart
-func (d *Database) GetNewNumericLocalpart(
-	ctx context.Context,
-) (int64, error) {
-	return d.accounts.selectNewNumericLocalpart(ctx)
-}
-
-func hashPassword(plaintext string) (hash string, err error) {
-	hashBytes, err := bcrypt.GenerateFromPassword([]byte(plaintext), bcrypt.DefaultCost)
-	return string(hashBytes), err
 }
 
 // Err3PIDInUse is the error returned when trying to save an association involving
 // a third-party identifier which is already associated to a local user.
 var Err3PIDInUse = errors.New("This third-party identifier is already in use")
-
-// SaveThreePIDAssociation saves the association between a third party identifier
-// and a local Matrix user (identified by the user's ID's local part).
-// If the third-party identifier is already part of an association, returns Err3PIDInUse.
-// Returns an error if there was a problem talking to the database.
-func (d *Database) SaveThreePIDAssociation(
-	ctx context.Context, threepid, localpart, medium string,
-) (err error) {
-	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		user, err := d.threepids.selectLocalpartForThreePID(
-			ctx, txn, threepid, medium,
-		)
-		if err != nil {
-			return err
-		}
-
-		if len(user) > 0 {
-			return Err3PIDInUse
-		}
-
-		return d.threepids.insertThreePID(ctx, txn, threepid, medium, localpart)
-	})
-}
-
-// RemoveThreePIDAssociation removes the association involving a given third-party
-// identifier.
-// If no association exists involving this third-party identifier, returns nothing.
-// If there was a problem talking to the database, returns an error.
-func (d *Database) RemoveThreePIDAssociation(
-	ctx context.Context, threepid string, medium string,
-) (err error) {
-	return d.threepids.deleteThreePID(ctx, threepid, medium)
-}
-
-// GetLocalpartForThreePID looks up the localpart associated with a given third-party
-// identifier.
-// If no association involves the given third-party idenfitier, returns an empty
-// string.
-// Returns an error if there was a problem talking to the database.
-func (d *Database) GetLocalpartForThreePID(
-	ctx context.Context, threepid string, medium string,
-) (localpart string, err error) {
-	return d.threepids.selectLocalpartForThreePID(ctx, nil, threepid, medium)
-}
-
-// GetThreePIDsForLocalpart looks up the third-party identifiers associated with
-// a given local user.
-// If no association is known for this user, returns an empty slice.
-// Returns an error if there was an issue talking to the database.
-func (d *Database) GetThreePIDsForLocalpart(
-	ctx context.Context, localpart string,
-) (threepids []authtypes.ThreePID, err error) {
-	return d.threepids.selectThreePIDsForLocalpart(ctx, localpart)
-}
-
-// GetFilter looks up the filter associated with a given local user and filter ID.
-// Returns a filter structure. Otherwise returns an error if no such filter exists
-// or if there was an error talking to the database.
-func (d *Database) GetFilter(
-	ctx context.Context, localpart string, filterID string,
-) (*gomatrixserverlib.Filter, error) {
-	return d.filter.selectFilter(ctx, localpart, filterID)
-}
-
-// PutFilter puts the passed filter into the database.
-// Returns the filterID as a string. Otherwise returns an error if something
-// goes wrong.
-func (d *Database) PutFilter(
-	ctx context.Context, localpart string, filter *gomatrixserverlib.Filter,
-) (string, error) {
-	return d.filter.insertFilter(ctx, filter, localpart)
-}
-
-// CheckAccountAvailability checks if the username/localpart is already present
-// in the database.
-// If the DB returns sql.ErrNoRows the Localpart isn't taken.
-func (d *Database) CheckAccountAvailability(ctx context.Context, localpart string) (bool, error) {
-	_, err := d.accounts.selectAccountByLocalpart(ctx, localpart)
-	if err == sql.ErrNoRows {
-		return true, nil
-	}
-	return false, err
-}
-
-// GetAccountByLocalpart returns the account associated with the given localpart.
-// This function assumes the request is authenticated or the account data is used only internally.
-// Returns sql.ErrNoRows if no account exists which matches the given localpart.
-func (d *Database) GetAccountByLocalpart(ctx context.Context, localpart string,
-) (*authtypes.Account, error) {
-	return d.accounts.selectAccountByLocalpart(ctx, localpart)
-}
diff --git a/clientapi/auth/storage/devices/devices_table.go b/clientapi/auth/storage/devices/postgres/devices_table.go
index 99741247..349bf1ef 100644
--- a/clientapi/auth/storage/devices/devices_table.go
+++ b/clientapi/auth/storage/devices/postgres/devices_table.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package devices
+package postgres
 
 import (
 	"context"
diff --git a/clientapi/auth/storage/devices/postgres/storage.go b/clientapi/auth/storage/devices/postgres/storage.go
new file mode 100644
index 00000000..221c3998
--- /dev/null
+++ b/clientapi/auth/storage/devices/postgres/storage.go
@@ -0,0 +1,182 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package postgres
+
+import (
+	"context"
+	"crypto/rand"
+	"database/sql"
+	"encoding/base64"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// The length of generated device IDs
+var deviceIDByteLength = 6
+
+// Database represents a device database.
+type Database struct {
+	db      *sql.DB
+	devices devicesStatements
+}
+
+// NewDatabase creates a new device database
+func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (*Database, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	d := devicesStatements{}
+	if err = d.prepare(db, serverName); err != nil {
+		return nil, err
+	}
+	return &Database{db, d}, nil
+}
+
+// GetDeviceByAccessToken returns the device matching the given access token.
+// Returns sql.ErrNoRows if no matching device was found.
+func (d *Database) GetDeviceByAccessToken(
+	ctx context.Context, token string,
+) (*authtypes.Device, error) {
+	return d.devices.selectDeviceByToken(ctx, token)
+}
+
+// GetDeviceByID returns the device matching the given ID.
+// Returns sql.ErrNoRows if no matching device was found.
+func (d *Database) GetDeviceByID(
+	ctx context.Context, localpart, deviceID string,
+) (*authtypes.Device, error) {
+	return d.devices.selectDeviceByID(ctx, localpart, deviceID)
+}
+
+// GetDevicesByLocalpart returns the devices matching the given localpart.
+func (d *Database) GetDevicesByLocalpart(
+	ctx context.Context, localpart string,
+) ([]authtypes.Device, error) {
+	return d.devices.selectDevicesByLocalpart(ctx, localpart)
+}
+
+// CreateDevice makes a new device associated with the given user ID localpart.
+// If there is already a device with the same device ID for this user, that access token will be revoked
+// and replaced with the given accessToken. If the given accessToken is already in use for another device,
+// an error will be returned.
+// If no device ID is given one is generated.
+// Returns the device on success.
+func (d *Database) CreateDevice(
+	ctx context.Context, localpart string, deviceID *string, accessToken string,
+	displayName *string,
+) (dev *authtypes.Device, returnErr error) {
+	if deviceID != nil {
+		returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+			var err error
+			// Revoke existing tokens for this device
+			if err = d.devices.deleteDevice(ctx, txn, *deviceID, localpart); err != nil {
+				return err
+			}
+
+			dev, err = d.devices.insertDevice(ctx, txn, *deviceID, localpart, accessToken, displayName)
+			return err
+		})
+	} else {
+		// We generate device IDs in a loop in case its already taken.
+		// We cap this at going round 5 times to ensure we don't spin forever
+		var newDeviceID string
+		for i := 1; i <= 5; i++ {
+			newDeviceID, returnErr = generateDeviceID()
+			if returnErr != nil {
+				return
+			}
+
+			returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+				var err error
+				dev, err = d.devices.insertDevice(ctx, txn, newDeviceID, localpart, accessToken, displayName)
+				return err
+			})
+			if returnErr == nil {
+				return
+			}
+		}
+	}
+	return
+}
+
+// generateDeviceID creates a new device id. Returns an error if failed to generate
+// random bytes.
+func generateDeviceID() (string, error) {
+	b := make([]byte, deviceIDByteLength)
+	_, err := rand.Read(b)
+	if err != nil {
+		return "", err
+	}
+	// url-safe no padding
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+// UpdateDevice updates the given device with the display name.
+// Returns SQL error if there are problems and nil on success.
+func (d *Database) UpdateDevice(
+	ctx context.Context, localpart, deviceID string, displayName *string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		return d.devices.updateDeviceName(ctx, txn, localpart, deviceID, displayName)
+	})
+}
+
+// RemoveDevice revokes a device by deleting the entry in the database
+// matching with the given device ID and user ID localpart.
+// If the device doesn't exist, it will not return an error
+// If something went wrong during the deletion, it will return the SQL error.
+func (d *Database) RemoveDevice(
+	ctx context.Context, deviceID, localpart string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.devices.deleteDevice(ctx, txn, deviceID, localpart); err != sql.ErrNoRows {
+			return err
+		}
+		return nil
+	})
+}
+
+// RemoveDevices revokes one or more devices by deleting the entry in the database
+// matching with the given device IDs and user ID localpart.
+// If the devices don't exist, it will not return an error
+// If something went wrong during the deletion, it will return the SQL error.
+func (d *Database) RemoveDevices(
+	ctx context.Context, localpart string, devices []string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.devices.deleteDevices(ctx, txn, localpart, devices); err != sql.ErrNoRows {
+			return err
+		}
+		return nil
+	})
+}
+
+// RemoveAllDevices revokes devices by deleting the entry in the
+// database matching the given user ID localpart.
+// If something went wrong during the deletion, it will return the SQL error.
+func (d *Database) RemoveAllDevices(
+	ctx context.Context, localpart string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.devices.deleteDevicesByLocalpart(ctx, txn, localpart); err != sql.ErrNoRows {
+			return err
+		}
+		return nil
+	})
+}
diff --git a/clientapi/auth/storage/devices/sqlite3/devices_table.go b/clientapi/auth/storage/devices/sqlite3/devices_table.go
new file mode 100644
index 00000000..dc88890d
--- /dev/null
+++ b/clientapi/auth/storage/devices/sqlite3/devices_table.go
@@ -0,0 +1,243 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+	"time"
+
+	"github.com/matrix-org/dendrite/common"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/clientapi/userutil"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const devicesSchema = `
+-- This sequence is used for automatic allocation of session_id.
+-- CREATE SEQUENCE IF NOT EXISTS device_session_id_seq START 1;
+
+-- Stores data about devices.
+CREATE TABLE IF NOT EXISTS device_devices (
+    access_token TEXT PRIMARY KEY,
+    session_id INTEGER,
+    device_id TEXT ,
+    localpart TEXT ,
+    created_ts BIGINT,
+    display_name TEXT,
+
+		UNIQUE (localpart, device_id)
+);
+`
+
+const insertDeviceSQL = "" +
+	"INSERT INTO device_devices (device_id, localpart, access_token, created_ts, display_name, session_id)" +
+	" VALUES ($1, $2, $3, $4, $5, $6)"
+
+const selectDevicesCountSQL = "" +
+	"SELECT COUNT(access_token) FROM device_devices"
+
+const selectDeviceByTokenSQL = "" +
+	"SELECT session_id, device_id, localpart FROM device_devices WHERE access_token = $1"
+
+const selectDeviceByIDSQL = "" +
+	"SELECT display_name FROM device_devices WHERE localpart = $1 and device_id = $2"
+
+const selectDevicesByLocalpartSQL = "" +
+	"SELECT device_id, display_name FROM device_devices WHERE localpart = $1"
+
+const updateDeviceNameSQL = "" +
+	"UPDATE device_devices SET display_name = $1 WHERE localpart = $2 AND device_id = $3"
+
+const deleteDeviceSQL = "" +
+	"DELETE FROM device_devices WHERE device_id = $1 AND localpart = $2"
+
+const deleteDevicesByLocalpartSQL = "" +
+	"DELETE FROM device_devices WHERE localpart = $1"
+
+const deleteDevicesSQL = "" +
+	"DELETE FROM device_devices WHERE localpart = $1 AND device_id IN ($2)"
+
+type devicesStatements struct {
+	db                           *sql.DB
+	insertDeviceStmt             *sql.Stmt
+	selectDevicesCountStmt       *sql.Stmt
+	selectDeviceByTokenStmt      *sql.Stmt
+	selectDeviceByIDStmt         *sql.Stmt
+	selectDevicesByLocalpartStmt *sql.Stmt
+	updateDeviceNameStmt         *sql.Stmt
+	deleteDeviceStmt             *sql.Stmt
+	deleteDevicesByLocalpartStmt *sql.Stmt
+	serverName                   gomatrixserverlib.ServerName
+}
+
+func (s *devicesStatements) prepare(db *sql.DB, server gomatrixserverlib.ServerName) (err error) {
+	s.db = db
+	_, err = db.Exec(devicesSchema)
+	if err != nil {
+		return
+	}
+	if s.insertDeviceStmt, err = db.Prepare(insertDeviceSQL); err != nil {
+		return
+	}
+	if s.selectDevicesCountStmt, err = db.Prepare(selectDevicesCountSQL); err != nil {
+		return
+	}
+	if s.selectDeviceByTokenStmt, err = db.Prepare(selectDeviceByTokenSQL); err != nil {
+		return
+	}
+	if s.selectDeviceByIDStmt, err = db.Prepare(selectDeviceByIDSQL); err != nil {
+		return
+	}
+	if s.selectDevicesByLocalpartStmt, err = db.Prepare(selectDevicesByLocalpartSQL); err != nil {
+		return
+	}
+	if s.updateDeviceNameStmt, err = db.Prepare(updateDeviceNameSQL); err != nil {
+		return
+	}
+	if s.deleteDeviceStmt, err = db.Prepare(deleteDeviceSQL); err != nil {
+		return
+	}
+	if s.deleteDevicesByLocalpartStmt, err = db.Prepare(deleteDevicesByLocalpartSQL); err != nil {
+		return
+	}
+	s.serverName = server
+	return
+}
+
+// insertDevice creates a new device. Returns an error if any device with the same access token already exists.
+// Returns an error if the user already has a device with the given device ID.
+// Returns the device on success.
+func (s *devicesStatements) insertDevice(
+	ctx context.Context, txn *sql.Tx, id, localpart, accessToken string,
+	displayName *string,
+) (*authtypes.Device, error) {
+	createdTimeMS := time.Now().UnixNano() / 1000000
+	var sessionID int64
+	countStmt := common.TxStmt(txn, s.selectDevicesCountStmt)
+	insertStmt := common.TxStmt(txn, s.insertDeviceStmt)
+	if err := countStmt.QueryRowContext(ctx).Scan(&sessionID); err != nil {
+		return nil, err
+	}
+	sessionID++
+	if _, err := insertStmt.ExecContext(ctx, id, localpart, accessToken, createdTimeMS, displayName, sessionID); err != nil {
+		return nil, err
+	}
+	return &authtypes.Device{
+		ID:          id,
+		UserID:      userutil.MakeUserID(localpart, s.serverName),
+		AccessToken: accessToken,
+		SessionID:   sessionID,
+	}, nil
+}
+
+func (s *devicesStatements) deleteDevice(
+	ctx context.Context, txn *sql.Tx, id, localpart string,
+) error {
+	stmt := common.TxStmt(txn, s.deleteDeviceStmt)
+	_, err := stmt.ExecContext(ctx, id, localpart)
+	return err
+}
+
+func (s *devicesStatements) deleteDevices(
+	ctx context.Context, txn *sql.Tx, localpart string, devices []string,
+) error {
+	orig := strings.Replace(deleteDevicesSQL, "($1)", common.QueryVariadic(len(devices)), 1)
+	prep, err := s.db.Prepare(orig)
+	if err != nil {
+		return err
+	}
+	stmt := common.TxStmt(txn, prep)
+	params := make([]interface{}, len(devices)+1)
+	params[0] = localpart
+	for i, v := range devices {
+		params[i+1] = v
+	}
+	params = append(params, params...)
+	_, err = stmt.ExecContext(ctx, params...)
+	return err
+}
+
+func (s *devicesStatements) deleteDevicesByLocalpart(
+	ctx context.Context, txn *sql.Tx, localpart string,
+) error {
+	stmt := common.TxStmt(txn, s.deleteDevicesByLocalpartStmt)
+	_, err := stmt.ExecContext(ctx, localpart)
+	return err
+}
+
+func (s *devicesStatements) updateDeviceName(
+	ctx context.Context, txn *sql.Tx, localpart, deviceID string, displayName *string,
+) error {
+	stmt := common.TxStmt(txn, s.updateDeviceNameStmt)
+	_, err := stmt.ExecContext(ctx, displayName, localpart, deviceID)
+	return err
+}
+
+func (s *devicesStatements) selectDeviceByToken(
+	ctx context.Context, accessToken string,
+) (*authtypes.Device, error) {
+	var dev authtypes.Device
+	var localpart string
+	stmt := s.selectDeviceByTokenStmt
+	err := stmt.QueryRowContext(ctx, accessToken).Scan(&dev.SessionID, &dev.ID, &localpart)
+	if err == nil {
+		dev.UserID = userutil.MakeUserID(localpart, s.serverName)
+		dev.AccessToken = accessToken
+	}
+	return &dev, err
+}
+
+// selectDeviceByID retrieves a device from the database with the given user
+// localpart and deviceID
+func (s *devicesStatements) selectDeviceByID(
+	ctx context.Context, localpart, deviceID string,
+) (*authtypes.Device, error) {
+	var dev authtypes.Device
+	var created sql.NullInt64
+	stmt := s.selectDeviceByIDStmt
+	err := stmt.QueryRowContext(ctx, localpart, deviceID).Scan(&created)
+	if err == nil {
+		dev.ID = deviceID
+		dev.UserID = userutil.MakeUserID(localpart, s.serverName)
+	}
+	return &dev, err
+}
+
+func (s *devicesStatements) selectDevicesByLocalpart(
+	ctx context.Context, localpart string,
+) ([]authtypes.Device, error) {
+	devices := []authtypes.Device{}
+
+	rows, err := s.selectDevicesByLocalpartStmt.QueryContext(ctx, localpart)
+
+	if err != nil {
+		return devices, err
+	}
+
+	for rows.Next() {
+		var dev authtypes.Device
+		err = rows.Scan(&dev.ID)
+		if err != nil {
+			return devices, err
+		}
+		dev.UserID = userutil.MakeUserID(localpart, s.serverName)
+		devices = append(devices, dev)
+	}
+
+	return devices, nil
+}
diff --git a/clientapi/auth/storage/devices/sqlite3/storage.go b/clientapi/auth/storage/devices/sqlite3/storage.go
new file mode 100644
index 00000000..e1ce6f00
--- /dev/null
+++ b/clientapi/auth/storage/devices/sqlite3/storage.go
@@ -0,0 +1,184 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"crypto/rand"
+	"database/sql"
+	"encoding/base64"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/gomatrixserverlib"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// The length of generated device IDs
+var deviceIDByteLength = 6
+
+// Database represents a device database.
+type Database struct {
+	db      *sql.DB
+	devices devicesStatements
+}
+
+// NewDatabase creates a new device database
+func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (*Database, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	d := devicesStatements{}
+	if err = d.prepare(db, serverName); err != nil {
+		return nil, err
+	}
+	return &Database{db, d}, nil
+}
+
+// GetDeviceByAccessToken returns the device matching the given access token.
+// Returns sql.ErrNoRows if no matching device was found.
+func (d *Database) GetDeviceByAccessToken(
+	ctx context.Context, token string,
+) (*authtypes.Device, error) {
+	return d.devices.selectDeviceByToken(ctx, token)
+}
+
+// GetDeviceByID returns the device matching the given ID.
+// Returns sql.ErrNoRows if no matching device was found.
+func (d *Database) GetDeviceByID(
+	ctx context.Context, localpart, deviceID string,
+) (*authtypes.Device, error) {
+	return d.devices.selectDeviceByID(ctx, localpart, deviceID)
+}
+
+// GetDevicesByLocalpart returns the devices matching the given localpart.
+func (d *Database) GetDevicesByLocalpart(
+	ctx context.Context, localpart string,
+) ([]authtypes.Device, error) {
+	return d.devices.selectDevicesByLocalpart(ctx, localpart)
+}
+
+// CreateDevice makes a new device associated with the given user ID localpart.
+// If there is already a device with the same device ID for this user, that access token will be revoked
+// and replaced with the given accessToken. If the given accessToken is already in use for another device,
+// an error will be returned.
+// If no device ID is given one is generated.
+// Returns the device on success.
+func (d *Database) CreateDevice(
+	ctx context.Context, localpart string, deviceID *string, accessToken string,
+	displayName *string,
+) (dev *authtypes.Device, returnErr error) {
+	if deviceID != nil {
+		returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+			var err error
+			// Revoke existing tokens for this device
+			if err = d.devices.deleteDevice(ctx, txn, *deviceID, localpart); err != nil {
+				return err
+			}
+
+			dev, err = d.devices.insertDevice(ctx, txn, *deviceID, localpart, accessToken, displayName)
+			return err
+		})
+	} else {
+		// We generate device IDs in a loop in case its already taken.
+		// We cap this at going round 5 times to ensure we don't spin forever
+		var newDeviceID string
+		for i := 1; i <= 5; i++ {
+			newDeviceID, returnErr = generateDeviceID()
+			if returnErr != nil {
+				return
+			}
+
+			returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+				var err error
+				dev, err = d.devices.insertDevice(ctx, txn, newDeviceID, localpart, accessToken, displayName)
+				return err
+			})
+			if returnErr == nil {
+				return
+			}
+		}
+	}
+	return
+}
+
+// generateDeviceID creates a new device id. Returns an error if failed to generate
+// random bytes.
+func generateDeviceID() (string, error) {
+	b := make([]byte, deviceIDByteLength)
+	_, err := rand.Read(b)
+	if err != nil {
+		return "", err
+	}
+	// url-safe no padding
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+// UpdateDevice updates the given device with the display name.
+// Returns SQL error if there are problems and nil on success.
+func (d *Database) UpdateDevice(
+	ctx context.Context, localpart, deviceID string, displayName *string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		return d.devices.updateDeviceName(ctx, txn, localpart, deviceID, displayName)
+	})
+}
+
+// RemoveDevice revokes a device by deleting the entry in the database
+// matching with the given device ID and user ID localpart.
+// If the device doesn't exist, it will not return an error
+// If something went wrong during the deletion, it will return the SQL error.
+func (d *Database) RemoveDevice(
+	ctx context.Context, deviceID, localpart string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.devices.deleteDevice(ctx, txn, deviceID, localpart); err != sql.ErrNoRows {
+			return err
+		}
+		return nil
+	})
+}
+
+// RemoveDevices revokes one or more devices by deleting the entry in the database
+// matching with the given device IDs and user ID localpart.
+// If the devices don't exist, it will not return an error
+// If something went wrong during the deletion, it will return the SQL error.
+func (d *Database) RemoveDevices(
+	ctx context.Context, localpart string, devices []string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.devices.deleteDevices(ctx, txn, localpart, devices); err != sql.ErrNoRows {
+			return err
+		}
+		return nil
+	})
+}
+
+// RemoveAllDevices revokes devices by deleting the entry in the
+// database matching the given user ID localpart.
+// If something went wrong during the deletion, it will return the SQL error.
+func (d *Database) RemoveAllDevices(
+	ctx context.Context, localpart string,
+) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.devices.deleteDevicesByLocalpart(ctx, txn, localpart); err != sql.ErrNoRows {
+			return err
+		}
+		return nil
+	})
+}
diff --git a/clientapi/auth/storage/devices/storage.go b/clientapi/auth/storage/devices/storage.go
index 150180c1..82f75640 100644
--- a/clientapi/auth/storage/devices/storage.go
+++ b/clientapi/auth/storage/devices/storage.go
@@ -1,182 +1,37 @@
-// Copyright 2017 Vector Creations Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package devices
 
 import (
 	"context"
-	"crypto/rand"
-	"database/sql"
-	"encoding/base64"
+	"net/url"
 
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
-	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices/postgres"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices/sqlite3"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-// The length of generated device IDs
-var deviceIDByteLength = 6
-
-// Database represents a device database.
-type Database struct {
-	db      *sql.DB
-	devices devicesStatements
-}
-
-// NewDatabase creates a new device database
-func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (*Database, error) {
-	var db *sql.DB
-	var err error
-	if db, err = sql.Open("postgres", dataSourceName); err != nil {
-		return nil, err
-	}
-	d := devicesStatements{}
-	if err = d.prepare(db, serverName); err != nil {
-		return nil, err
-	}
-	return &Database{db, d}, nil
-}
-
-// GetDeviceByAccessToken returns the device matching the given access token.
-// Returns sql.ErrNoRows if no matching device was found.
-func (d *Database) GetDeviceByAccessToken(
-	ctx context.Context, token string,
-) (*authtypes.Device, error) {
-	return d.devices.selectDeviceByToken(ctx, token)
-}
-
-// GetDeviceByID returns the device matching the given ID.
-// Returns sql.ErrNoRows if no matching device was found.
-func (d *Database) GetDeviceByID(
-	ctx context.Context, localpart, deviceID string,
-) (*authtypes.Device, error) {
-	return d.devices.selectDeviceByID(ctx, localpart, deviceID)
-}
-
-// GetDevicesByLocalpart returns the devices matching the given localpart.
-func (d *Database) GetDevicesByLocalpart(
-	ctx context.Context, localpart string,
-) ([]authtypes.Device, error) {
-	return d.devices.selectDevicesByLocalpart(ctx, localpart)
-}
-
-// CreateDevice makes a new device associated with the given user ID localpart.
-// If there is already a device with the same device ID for this user, that access token will be revoked
-// and replaced with the given accessToken. If the given accessToken is already in use for another device,
-// an error will be returned.
-// If no device ID is given one is generated.
-// Returns the device on success.
-func (d *Database) CreateDevice(
-	ctx context.Context, localpart string, deviceID *string, accessToken string,
-	displayName *string,
-) (dev *authtypes.Device, returnErr error) {
-	if deviceID != nil {
-		returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
-			var err error
-			// Revoke existing tokens for this device
-			if err = d.devices.deleteDevice(ctx, txn, *deviceID, localpart); err != nil {
-				return err
-			}
-
-			dev, err = d.devices.insertDevice(ctx, txn, *deviceID, localpart, accessToken, displayName)
-			return err
-		})
-	} else {
-		// We generate device IDs in a loop in case its already taken.
-		// We cap this at going round 5 times to ensure we don't spin forever
-		var newDeviceID string
-		for i := 1; i <= 5; i++ {
-			newDeviceID, returnErr = generateDeviceID()
-			if returnErr != nil {
-				return
-			}
-
-			returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
-				var err error
-				dev, err = d.devices.insertDevice(ctx, txn, newDeviceID, localpart, accessToken, displayName)
-				return err
-			})
-			if returnErr == nil {
-				return
-			}
-		}
-	}
-	return
+type Database interface {
+	GetDeviceByAccessToken(ctx context.Context, token string) (*authtypes.Device, error)
+	GetDeviceByID(ctx context.Context, localpart, deviceID string) (*authtypes.Device, error)
+	GetDevicesByLocalpart(ctx context.Context, localpart string) ([]authtypes.Device, error)
+	CreateDevice(ctx context.Context, localpart string, deviceID *string, accessToken string, displayName *string) (dev *authtypes.Device, returnErr error)
+	UpdateDevice(ctx context.Context, localpart, deviceID string, displayName *string) error
+	RemoveDevice(ctx context.Context, deviceID, localpart string) error
+	RemoveDevices(ctx context.Context, localpart string, devices []string) error
+	RemoveAllDevices(ctx context.Context, localpart string) error
 }
 
-// generateDeviceID creates a new device id. Returns an error if failed to generate
-// random bytes.
-func generateDeviceID() (string, error) {
-	b := make([]byte, deviceIDByteLength)
-	_, err := rand.Read(b)
+func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
 	if err != nil {
-		return "", err
+		return postgres.NewDatabase(dataSourceName, serverName)
+	}
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewDatabase(dataSourceName, serverName)
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName, serverName)
+	default:
+		return postgres.NewDatabase(dataSourceName, serverName)
 	}
-	// url-safe no padding
-	return base64.RawURLEncoding.EncodeToString(b), nil
-}
-
-// UpdateDevice updates the given device with the display name.
-// Returns SQL error if there are problems and nil on success.
-func (d *Database) UpdateDevice(
-	ctx context.Context, localpart, deviceID string, displayName *string,
-) error {
-	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		return d.devices.updateDeviceName(ctx, txn, localpart, deviceID, displayName)
-	})
-}
-
-// RemoveDevice revokes a device by deleting the entry in the database
-// matching with the given device ID and user ID localpart.
-// If the device doesn't exist, it will not return an error
-// If something went wrong during the deletion, it will return the SQL error.
-func (d *Database) RemoveDevice(
-	ctx context.Context, deviceID, localpart string,
-) error {
-	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.devices.deleteDevice(ctx, txn, deviceID, localpart); err != sql.ErrNoRows {
-			return err
-		}
-		return nil
-	})
-}
-
-// RemoveDevices revokes one or more devices by deleting the entry in the database
-// matching with the given device IDs and user ID localpart.
-// If the devices don't exist, it will not return an error
-// If something went wrong during the deletion, it will return the SQL error.
-func (d *Database) RemoveDevices(
-	ctx context.Context, localpart string, devices []string,
-) error {
-	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.devices.deleteDevices(ctx, txn, localpart, devices); err != sql.ErrNoRows {
-			return err
-		}
-		return nil
-	})
-}
-
-// RemoveAllDevices revokes devices by deleting the entry in the
-// database matching the given user ID localpart.
-// If something went wrong during the deletion, it will return the SQL error.
-func (d *Database) RemoveAllDevices(
-	ctx context.Context, localpart string,
-) error {
-	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.devices.deleteDevicesByLocalpart(ctx, txn, localpart); err != sql.ErrNoRows {
-			return err
-		}
-		return nil
-	})
 }
diff --git a/clientapi/clientapi.go b/clientapi/clientapi.go
index c911fecc..bb44e016 100644
--- a/clientapi/clientapi.go
+++ b/clientapi/clientapi.go
@@ -34,8 +34,8 @@ import (
 // component.
 func SetupClientAPIComponent(
 	base *basecomponent.BaseDendrite,
-	deviceDB *devices.Database,
-	accountsDB *accounts.Database,
+	deviceDB devices.Database,
+	accountsDB accounts.Database,
 	federation *gomatrixserverlib.FederationClient,
 	keyRing *gomatrixserverlib.KeyRing,
 	aliasAPI roomserverAPI.RoomserverAliasAPI,
diff --git a/clientapi/consumers/roomserver.go b/clientapi/consumers/roomserver.go
index 0ee7c6bf..a6528151 100644
--- a/clientapi/consumers/roomserver.go
+++ b/clientapi/consumers/roomserver.go
@@ -31,7 +31,7 @@ import (
 // OutputRoomEventConsumer consumes events that originated in the room server.
 type OutputRoomEventConsumer struct {
 	roomServerConsumer *common.ContinualConsumer
-	db                 *accounts.Database
+	db                 accounts.Database
 	query              api.RoomserverQueryAPI
 	serverName         string
 }
@@ -40,7 +40,7 @@ type OutputRoomEventConsumer struct {
 func NewOutputRoomEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
-	store *accounts.Database,
+	store accounts.Database,
 	queryAPI api.RoomserverQueryAPI,
 ) *OutputRoomEventConsumer {
 
diff --git a/clientapi/routing/account_data.go b/clientapi/routing/account_data.go
index bbc8c258..8ae9de2d 100644
--- a/clientapi/routing/account_data.go
+++ b/clientapi/routing/account_data.go
@@ -30,7 +30,7 @@ import (
 
 // GetAccountData implements GET /user/{userId}/[rooms/{roomid}/]account_data/{type}
 func GetAccountData(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 	userID string, roomID string, dataType string,
 ) util.JSONResponse {
 	if userID != device.UserID {
@@ -62,7 +62,7 @@ func GetAccountData(
 
 // SaveAccountData implements PUT /user/{userId}/[rooms/{roomId}/]account_data/{type}
 func SaveAccountData(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 	userID string, roomID string, dataType string, syncProducer *producers.SyncAPIProducer,
 ) util.JSONResponse {
 	if userID != device.UserID {
diff --git a/clientapi/routing/createroom.go b/clientapi/routing/createroom.go
index f6f06421..2b1245b9 100644
--- a/clientapi/routing/createroom.go
+++ b/clientapi/routing/createroom.go
@@ -135,7 +135,7 @@ type fledglingEvent struct {
 func CreateRoom(
 	req *http.Request, device *authtypes.Device,
 	cfg *config.Dendrite, producer *producers.RoomserverProducer,
-	accountDB *accounts.Database, aliasAPI roomserverAPI.RoomserverAliasAPI,
+	accountDB accounts.Database, aliasAPI roomserverAPI.RoomserverAliasAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI,
 ) util.JSONResponse {
 	// TODO (#267): Check room ID doesn't clash with an existing one, and we
@@ -149,7 +149,7 @@ func CreateRoom(
 func createRoom(
 	req *http.Request, device *authtypes.Device,
 	cfg *config.Dendrite, roomID string, producer *producers.RoomserverProducer,
-	accountDB *accounts.Database, aliasAPI roomserverAPI.RoomserverAliasAPI,
+	accountDB accounts.Database, aliasAPI roomserverAPI.RoomserverAliasAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI,
 ) util.JSONResponse {
 	logger := util.GetLogger(req.Context())
diff --git a/clientapi/routing/device.go b/clientapi/routing/device.go
index eb7cd0b0..9b8647cd 100644
--- a/clientapi/routing/device.go
+++ b/clientapi/routing/device.go
@@ -46,7 +46,7 @@ type devicesDeleteJSON struct {
 
 // GetDeviceByID handles /devices/{deviceID}
 func GetDeviceByID(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 	deviceID string,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
@@ -76,7 +76,7 @@ func GetDeviceByID(
 
 // GetDevicesByLocalpart handles /devices
 func GetDevicesByLocalpart(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
 	if err != nil {
@@ -107,7 +107,7 @@ func GetDevicesByLocalpart(
 
 // UpdateDeviceByID handles PUT on /devices/{deviceID}
 func UpdateDeviceByID(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 	deviceID string,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
@@ -153,7 +153,7 @@ func UpdateDeviceByID(
 
 // DeleteDeviceById handles DELETE requests to /devices/{deviceId}
 func DeleteDeviceById(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 	deviceID string,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
@@ -176,7 +176,7 @@ func DeleteDeviceById(
 
 // DeleteDevices handles POST requests to /delete_devices
 func DeleteDevices(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
 	if err != nil {
diff --git a/clientapi/routing/filter.go b/clientapi/routing/filter.go
index eec501ff..583b2395 100644
--- a/clientapi/routing/filter.go
+++ b/clientapi/routing/filter.go
@@ -27,7 +27,7 @@ import (
 
 // GetFilter implements GET /_matrix/client/r0/user/{userId}/filter/{filterId}
 func GetFilter(
-	req *http.Request, device *authtypes.Device, accountDB *accounts.Database, userID string, filterID string,
+	req *http.Request, device *authtypes.Device, accountDB accounts.Database, userID string, filterID string,
 ) util.JSONResponse {
 	if userID != device.UserID {
 		return util.JSONResponse{
@@ -63,7 +63,7 @@ type filterResponse struct {
 
 //PutFilter implements POST /_matrix/client/r0/user/{userId}/filter
 func PutFilter(
-	req *http.Request, device *authtypes.Device, accountDB *accounts.Database, userID string,
+	req *http.Request, device *authtypes.Device, accountDB accounts.Database, userID string,
 ) util.JSONResponse {
 	if userID != device.UserID {
 		return util.JSONResponse{
diff --git a/clientapi/routing/joinroom.go b/clientapi/routing/joinroom.go
index 8b3f3740..5e6f3e55 100644
--- a/clientapi/routing/joinroom.go
+++ b/clientapi/routing/joinroom.go
@@ -45,7 +45,7 @@ func JoinRoomByIDOrAlias(
 	queryAPI roomserverAPI.RoomserverQueryAPI,
 	aliasAPI roomserverAPI.RoomserverAliasAPI,
 	keyRing gomatrixserverlib.KeyRing,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 ) util.JSONResponse {
 	var content map[string]interface{} // must be a JSON object
 	if resErr := httputil.UnmarshalJSONRequest(req, &content); resErr != nil {
diff --git a/clientapi/routing/login.go b/clientapi/routing/login.go
index 2f4fb83c..b8364ed9 100644
--- a/clientapi/routing/login.go
+++ b/clientapi/routing/login.go
@@ -70,7 +70,7 @@ func passwordLogin() loginFlows {
 
 // Login implements GET and POST /login
 func Login(
-	req *http.Request, accountDB *accounts.Database, deviceDB *devices.Database,
+	req *http.Request, accountDB accounts.Database, deviceDB devices.Database,
 	cfg *config.Dendrite,
 ) util.JSONResponse {
 	if req.Method == http.MethodGet { // TODO: support other forms of login other than password, depending on config options
@@ -153,7 +153,7 @@ func Login(
 func getDevice(
 	ctx context.Context,
 	r passwordRequest,
-	deviceDB *devices.Database,
+	deviceDB devices.Database,
 	acc *authtypes.Account,
 	token string,
 ) (dev *authtypes.Device, err error) {
diff --git a/clientapi/routing/logout.go b/clientapi/routing/logout.go
index 3294fbcd..0ac9ca4a 100644
--- a/clientapi/routing/logout.go
+++ b/clientapi/routing/logout.go
@@ -26,7 +26,7 @@ import (
 
 // Logout handles POST /logout
 func Logout(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
 	if err != nil {
@@ -45,7 +45,7 @@ func Logout(
 
 // LogoutAll handles POST /logout/all
 func LogoutAll(
-	req *http.Request, deviceDB *devices.Database, device *authtypes.Device,
+	req *http.Request, deviceDB devices.Database, device *authtypes.Device,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
 	if err != nil {
diff --git a/clientapi/routing/membership.go b/clientapi/routing/membership.go
index 8b8b3a0f..68c131a2 100644
--- a/clientapi/routing/membership.go
+++ b/clientapi/routing/membership.go
@@ -40,7 +40,7 @@ var errMissingUserID = errors.New("'user_id' must be supplied")
 // SendMembership implements PUT /rooms/{roomID}/(join|kick|ban|unban|leave|invite)
 // by building a m.room.member event then sending it to the room server
 func SendMembership(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 	roomID string, membership string, cfg *config.Dendrite,
 	queryAPI roomserverAPI.RoomserverQueryAPI, asAPI appserviceAPI.AppServiceQueryAPI,
 	producer *producers.RoomserverProducer,
@@ -116,7 +116,7 @@ func SendMembership(
 
 func buildMembershipEvent(
 	ctx context.Context,
-	body threepid.MembershipRequest, accountDB *accounts.Database,
+	body threepid.MembershipRequest, accountDB accounts.Database,
 	device *authtypes.Device,
 	membership, roomID string,
 	cfg *config.Dendrite, evTime time.Time,
@@ -166,7 +166,7 @@ func loadProfile(
 	ctx context.Context,
 	userID string,
 	cfg *config.Dendrite,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	asAPI appserviceAPI.AppServiceQueryAPI,
 ) (*authtypes.Profile, error) {
 	_, serverName, err := gomatrixserverlib.SplitID('@', userID)
@@ -216,7 +216,7 @@ func checkAndProcessThreepid(
 	body *threepid.MembershipRequest,
 	cfg *config.Dendrite,
 	queryAPI roomserverAPI.RoomserverQueryAPI,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	producer *producers.RoomserverProducer,
 	membership, roomID string,
 	evTime time.Time,
diff --git a/clientapi/routing/profile.go b/clientapi/routing/profile.go
index 4688b19e..9b091ddf 100644
--- a/clientapi/routing/profile.go
+++ b/clientapi/routing/profile.go
@@ -36,7 +36,7 @@ import (
 
 // GetProfile implements GET /profile/{userID}
 func GetProfile(
-	req *http.Request, accountDB *accounts.Database, cfg *config.Dendrite,
+	req *http.Request, accountDB accounts.Database, cfg *config.Dendrite,
 	userID string,
 	asAPI appserviceAPI.AppServiceQueryAPI,
 	federation *gomatrixserverlib.FederationClient,
@@ -64,7 +64,7 @@ func GetProfile(
 
 // GetAvatarURL implements GET /profile/{userID}/avatar_url
 func GetAvatarURL(
-	req *http.Request, accountDB *accounts.Database, cfg *config.Dendrite,
+	req *http.Request, accountDB accounts.Database, cfg *config.Dendrite,
 	userID string, asAPI appserviceAPI.AppServiceQueryAPI,
 	federation *gomatrixserverlib.FederationClient,
 ) util.JSONResponse {
@@ -90,7 +90,7 @@ func GetAvatarURL(
 
 // SetAvatarURL implements PUT /profile/{userID}/avatar_url
 func SetAvatarURL(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 	userID string, producer *producers.UserUpdateProducer, cfg *config.Dendrite,
 	rsProducer *producers.RoomserverProducer, queryAPI api.RoomserverQueryAPI,
 ) util.JSONResponse {
@@ -170,7 +170,7 @@ func SetAvatarURL(
 
 // GetDisplayName implements GET /profile/{userID}/displayname
 func GetDisplayName(
-	req *http.Request, accountDB *accounts.Database, cfg *config.Dendrite,
+	req *http.Request, accountDB accounts.Database, cfg *config.Dendrite,
 	userID string, asAPI appserviceAPI.AppServiceQueryAPI,
 	federation *gomatrixserverlib.FederationClient,
 ) util.JSONResponse {
@@ -196,7 +196,7 @@ func GetDisplayName(
 
 // SetDisplayName implements PUT /profile/{userID}/displayname
 func SetDisplayName(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 	userID string, producer *producers.UserUpdateProducer, cfg *config.Dendrite,
 	rsProducer *producers.RoomserverProducer, queryAPI api.RoomserverQueryAPI,
 ) util.JSONResponse {
@@ -279,7 +279,7 @@ func SetDisplayName(
 // Returns an error when something goes wrong or specifically
 // common.ErrProfileNoExists when the profile doesn't exist.
 func getProfile(
-	ctx context.Context, accountDB *accounts.Database, cfg *config.Dendrite,
+	ctx context.Context, accountDB accounts.Database, cfg *config.Dendrite,
 	userID string,
 	asAPI appserviceAPI.AppServiceQueryAPI,
 	federation *gomatrixserverlib.FederationClient,
diff --git a/clientapi/routing/register.go b/clientapi/routing/register.go
index 4375faaf..9d67d998 100644
--- a/clientapi/routing/register.go
+++ b/clientapi/routing/register.go
@@ -440,8 +440,8 @@ func validateApplicationService(
 // http://matrix.org/speculator/spec/HEAD/client_server/unstable.html#post-matrix-client-unstable-register
 func Register(
 	req *http.Request,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 	cfg *config.Dendrite,
 ) util.JSONResponse {
 
@@ -513,8 +513,8 @@ func handleGuestRegistration(
 	req *http.Request,
 	r registerRequest,
 	cfg *config.Dendrite,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 ) util.JSONResponse {
 
 	//Generate numeric local part for guest user
@@ -570,8 +570,8 @@ func handleRegistrationFlow(
 	r registerRequest,
 	sessionID string,
 	cfg *config.Dendrite,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 ) util.JSONResponse {
 	// TODO: Shared secret registration (create new user scripts)
 	// TODO: Enable registration config flag
@@ -668,8 +668,8 @@ func handleApplicationServiceRegistration(
 	req *http.Request,
 	r registerRequest,
 	cfg *config.Dendrite,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 ) util.JSONResponse {
 	// Check if we previously had issues extracting the access token from the
 	// request.
@@ -707,8 +707,8 @@ func checkAndCompleteFlow(
 	r registerRequest,
 	sessionID string,
 	cfg *config.Dendrite,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 ) util.JSONResponse {
 	if checkFlowCompleted(flow, cfg.Derived.Registration.Flows) {
 		// This flow was completed, registration can continue
@@ -730,8 +730,8 @@ func checkAndCompleteFlow(
 // LegacyRegister process register requests from the legacy v1 API
 func LegacyRegister(
 	req *http.Request,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 	cfg *config.Dendrite,
 ) util.JSONResponse {
 	var r legacyRegisterRequest
@@ -814,8 +814,8 @@ func parseAndValidateLegacyLogin(req *http.Request, r *legacyRegisterRequest) *u
 // not all
 func completeRegistration(
 	ctx context.Context,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 	username, password, appserviceID string,
 	inhibitLogin common.WeakBoolean,
 	displayName, deviceID *string,
@@ -992,7 +992,7 @@ type availableResponse struct {
 func RegisterAvailable(
 	req *http.Request,
 	cfg *config.Dendrite,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 ) util.JSONResponse {
 	username := req.URL.Query().Get("username")
 
diff --git a/clientapi/routing/room_tagging.go b/clientapi/routing/room_tagging.go
index 487081c5..aa5f13c4 100644
--- a/clientapi/routing/room_tagging.go
+++ b/clientapi/routing/room_tagging.go
@@ -40,7 +40,7 @@ func newTag() gomatrix.TagContent {
 // GetTags implements GET /_matrix/client/r0/user/{userID}/rooms/{roomID}/tags
 func GetTags(
 	req *http.Request,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	device *authtypes.Device,
 	userID string,
 	roomID string,
@@ -77,7 +77,7 @@ func GetTags(
 // the tag to the "map" and saving the new "map" to the DB
 func PutTag(
 	req *http.Request,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	device *authtypes.Device,
 	userID string,
 	roomID string,
@@ -134,7 +134,7 @@ func PutTag(
 // the "map" and then saving the new "map" in the DB
 func DeleteTag(
 	req *http.Request,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	device *authtypes.Device,
 	userID string,
 	roomID string,
@@ -203,7 +203,7 @@ func obtainSavedTags(
 	req *http.Request,
 	userID string,
 	roomID string,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 ) (string, *gomatrixserverlib.ClientEvent, error) {
 	localpart, _, err := gomatrixserverlib.SplitID('@', userID)
 	if err != nil {
@@ -222,7 +222,7 @@ func saveTagData(
 	req *http.Request,
 	localpart string,
 	roomID string,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	Tag gomatrix.TagContent,
 ) error {
 	newTagData, err := json.Marshal(Tag)
diff --git a/clientapi/routing/routing.go b/clientapi/routing/routing.go
index f519523a..f0841b79 100644
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@@ -52,8 +52,8 @@ func Setup(
 	queryAPI roomserverAPI.RoomserverQueryAPI,
 	aliasAPI roomserverAPI.RoomserverAliasAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 	federation *gomatrixserverlib.FederationClient,
 	keyRing gomatrixserverlib.KeyRing,
 	userUpdateProducer *producers.UserUpdateProducer,
diff --git a/clientapi/routing/sendtyping.go b/clientapi/routing/sendtyping.go
index 561a2d89..db3ab28b 100644
--- a/clientapi/routing/sendtyping.go
+++ b/clientapi/routing/sendtyping.go
@@ -34,7 +34,7 @@ type typingContentJSON struct {
 // sends the typing events to client API typingProducer
 func SendTyping(
 	req *http.Request, device *authtypes.Device, roomID string,
-	userID string, accountDB *accounts.Database,
+	userID string, accountDB accounts.Database,
 	typingProducer *producers.TypingServerProducer,
 ) util.JSONResponse {
 	if device.UserID != userID {
diff --git a/clientapi/routing/threepid.go b/clientapi/routing/threepid.go
index 88b02fe4..69383cdf 100644
--- a/clientapi/routing/threepid.go
+++ b/clientapi/routing/threepid.go
@@ -39,7 +39,7 @@ type threePIDsResponse struct {
 // RequestEmailToken implements:
 //     POST /account/3pid/email/requestToken
 //     POST /register/email/requestToken
-func RequestEmailToken(req *http.Request, accountDB *accounts.Database, cfg *config.Dendrite) util.JSONResponse {
+func RequestEmailToken(req *http.Request, accountDB accounts.Database, cfg *config.Dendrite) util.JSONResponse {
 	var body threepid.EmailAssociationRequest
 	if reqErr := httputil.UnmarshalJSONRequest(req, &body); reqErr != nil {
 		return *reqErr
@@ -82,7 +82,7 @@ func RequestEmailToken(req *http.Request, accountDB *accounts.Database, cfg *con
 
 // CheckAndSave3PIDAssociation implements POST /account/3pid
 func CheckAndSave3PIDAssociation(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 	cfg *config.Dendrite,
 ) util.JSONResponse {
 	var body threepid.EmailAssociationCheckRequest
@@ -142,7 +142,7 @@ func CheckAndSave3PIDAssociation(
 
 // GetAssociated3PIDs implements GET /account/3pid
 func GetAssociated3PIDs(
-	req *http.Request, accountDB *accounts.Database, device *authtypes.Device,
+	req *http.Request, accountDB accounts.Database, device *authtypes.Device,
 ) util.JSONResponse {
 	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
 	if err != nil {
@@ -161,7 +161,7 @@ func GetAssociated3PIDs(
 }
 
 // Forget3PID implements POST /account/3pid/delete
-func Forget3PID(req *http.Request, accountDB *accounts.Database) util.JSONResponse {
+func Forget3PID(req *http.Request, accountDB accounts.Database) util.JSONResponse {
 	var body authtypes.ThreePID
 	if reqErr := httputil.UnmarshalJSONRequest(req, &body); reqErr != nil {
 		return *reqErr
diff --git a/clientapi/threepid/invites.go b/clientapi/threepid/invites.go
index 2cf88d6e..aa54aa9f 100644
--- a/clientapi/threepid/invites.go
+++ b/clientapi/threepid/invites.go
@@ -87,7 +87,7 @@ var (
 func CheckAndProcessInvite(
 	ctx context.Context,
 	device *authtypes.Device, body *MembershipRequest, cfg *config.Dendrite,
-	queryAPI api.RoomserverQueryAPI, db *accounts.Database,
+	queryAPI api.RoomserverQueryAPI, db accounts.Database,
 	producer *producers.RoomserverProducer, membership string, roomID string,
 	evTime time.Time,
 ) (inviteStoredOnIDServer bool, err error) {
@@ -137,7 +137,7 @@ func CheckAndProcessInvite(
 // Returns an error if a check or a request failed.
 func queryIDServer(
 	ctx context.Context,
-	db *accounts.Database, cfg *config.Dendrite, device *authtypes.Device,
+	db accounts.Database, cfg *config.Dendrite, device *authtypes.Device,
 	body *MembershipRequest, roomID string,
 ) (lookupRes *idServerLookupResponse, storeInviteRes *idServerStoreInviteResponse, err error) {
 	if err = isTrusted(body.IDServer, cfg); err != nil {
@@ -206,7 +206,7 @@ func queryIDServerLookup(ctx context.Context, body *MembershipRequest) (*idServe
 // Returns an error if the request failed to send or if the response couldn't be parsed.
 func queryIDServerStoreInvite(
 	ctx context.Context,
-	db *accounts.Database, cfg *config.Dendrite, device *authtypes.Device,
+	db accounts.Database, cfg *config.Dendrite, device *authtypes.Device,
 	body *MembershipRequest, roomID string,
 ) (*idServerStoreInviteResponse, error) {
 	// Retrieve the sender's profile to get their display name
diff --git a/cmd/kafka-producer/main.go b/cmd/kafka-producer/main.go
index 8a4340f2..f5f243e4 100644
--- a/cmd/kafka-producer/main.go
+++ b/cmd/kafka-producer/main.go
@@ -21,7 +21,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/Shopify/sarama"
+	sarama "gopkg.in/Shopify/sarama.v1"
 )
 
 const usage = `Usage: %s
diff --git a/common/basecomponent/base.go b/common/basecomponent/base.go
index dc917ffe..4274de2b 100644
--- a/common/basecomponent/base.go
+++ b/common/basecomponent/base.go
@@ -18,6 +18,7 @@ import (
 	"database/sql"
 	"io"
 	"net/http"
+	"net/url"
 
 	"golang.org/x/crypto/ed25519"
 
@@ -68,7 +69,13 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string) *BaseDendrite {
 		logrus.WithError(err).Panicf("failed to start opentracing")
 	}
 
-	kafkaConsumer, kafkaProducer := setupKafka(cfg)
+	var kafkaConsumer sarama.Consumer
+	var kafkaProducer sarama.SyncProducer
+	if cfg.Kafka.UseNaffka {
+		kafkaConsumer, kafkaProducer = setupNaffka(cfg)
+	} else {
+		kafkaConsumer, kafkaProducer = setupKafka(cfg)
+	}
 
 	return &BaseDendrite{
 		componentName: componentName,
@@ -118,7 +125,7 @@ func (b *BaseDendrite) CreateHTTPFederationSenderAPIs() federationSenderAPI.Fede
 
 // CreateDeviceDB creates a new instance of the device database. Should only be
 // called once per component.
-func (b *BaseDendrite) CreateDeviceDB() *devices.Database {
+func (b *BaseDendrite) CreateDeviceDB() devices.Database {
 	db, err := devices.NewDatabase(string(b.Cfg.Database.Device), b.Cfg.Matrix.ServerName)
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to devices db")
@@ -129,7 +136,7 @@ func (b *BaseDendrite) CreateDeviceDB() *devices.Database {
 
 // CreateAccountsDB creates a new instance of the accounts database. Should only
 // be called once per component.
-func (b *BaseDendrite) CreateAccountsDB() *accounts.Database {
+func (b *BaseDendrite) CreateAccountsDB() accounts.Database {
 	db, err := accounts.NewDatabase(string(b.Cfg.Database.Account), b.Cfg.Matrix.ServerName)
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to accounts db")
@@ -186,37 +193,58 @@ func (b *BaseDendrite) SetupAndServeHTTP(bindaddr string, listenaddr string) {
 	logrus.Infof("Stopped %s server on %s", b.componentName, addr)
 }
 
-// setupKafka creates kafka consumer/producer pair from the config. Checks if
-// should use naffka.
+// setupKafka creates kafka consumer/producer pair from the config.
 func setupKafka(cfg *config.Dendrite) (sarama.Consumer, sarama.SyncProducer) {
-	if cfg.Kafka.UseNaffka {
-		db, err := sql.Open("postgres", string(cfg.Database.Naffka))
+	consumer, err := sarama.NewConsumer(cfg.Kafka.Addresses, nil)
+	if err != nil {
+		logrus.WithError(err).Panic("failed to start kafka consumer")
+	}
+
+	producer, err := sarama.NewSyncProducer(cfg.Kafka.Addresses, nil)
+	if err != nil {
+		logrus.WithError(err).Panic("failed to setup kafka producers")
+	}
+
+	return consumer, producer
+}
+
+// setupNaffka creates kafka consumer/producer pair from the config.
+func setupNaffka(cfg *config.Dendrite) (sarama.Consumer, sarama.SyncProducer) {
+	var err error
+	var db *sql.DB
+	var naffkaDB *naffka.DatabaseImpl
+
+	uri, err := url.Parse(string(cfg.Database.Naffka))
+	if err != nil || uri.Scheme == "file" {
+		db, err = sql.Open("sqlite3", string(cfg.Database.Naffka))
 		if err != nil {
 			logrus.WithError(err).Panic("Failed to open naffka database")
 		}
 
-		naffkaDB, err := naffka.NewPostgresqlDatabase(db)
+		naffkaDB, err = naffka.NewSqliteDatabase(db)
 		if err != nil {
 			logrus.WithError(err).Panic("Failed to setup naffka database")
 		}
-
-		naff, err := naffka.New(naffkaDB)
+	} else {
+		db, err = sql.Open("postgres", string(cfg.Database.Naffka))
 		if err != nil {
-			logrus.WithError(err).Panic("Failed to setup naffka")
+			logrus.WithError(err).Panic("Failed to open naffka database")
 		}
 
-		return naff, naff
+		naffkaDB, err = naffka.NewPostgresqlDatabase(db)
+		if err != nil {
+			logrus.WithError(err).Panic("Failed to setup naffka database")
+		}
 	}
 
-	consumer, err := sarama.NewConsumer(cfg.Kafka.Addresses, nil)
-	if err != nil {
-		logrus.WithError(err).Panic("failed to start kafka consumer")
+	if naffkaDB == nil {
+		panic("naffka connection string not understood")
 	}
 
-	producer, err := sarama.NewSyncProducer(cfg.Kafka.Addresses, nil)
+	naff, err := naffka.New(naffkaDB)
 	if err != nil {
-		logrus.WithError(err).Panic("failed to setup kafka producers")
+		logrus.WithError(err).Panic("Failed to setup naffka")
 	}
 
-	return consumer, producer
+	return naff, naff
 }
diff --git a/common/keydb/keydb.go b/common/keydb/keydb.go
index d1f2b7eb..cf15c9f0 100644
--- a/common/keydb/keydb.go
+++ b/common/keydb/keydb.go
@@ -21,6 +21,7 @@ import (
 	"golang.org/x/crypto/ed25519"
 
 	"github.com/matrix-org/dendrite/common/keydb/postgres"
+	"github.com/matrix-org/dendrite/common/keydb/sqlite3"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
@@ -44,6 +45,8 @@ func NewDatabase(
 	switch uri.Scheme {
 	case "postgres":
 		return postgres.NewDatabase(dataSourceName, serverName, serverKey, serverKeyID)
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName, serverName, serverKey, serverKeyID)
 	default:
 		return postgres.NewDatabase(dataSourceName, serverName, serverKey, serverKeyID)
 	}
diff --git a/common/keydb/sqlite3/keydb.go b/common/keydb/sqlite3/keydb.go
new file mode 100644
index 00000000..88eb9d9f
--- /dev/null
+++ b/common/keydb/sqlite3/keydb.go
@@ -0,0 +1,115 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"math"
+
+	"golang.org/x/crypto/ed25519"
+
+	"github.com/matrix-org/gomatrixserverlib"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// A Database implements gomatrixserverlib.KeyDatabase and is used to store
+// the public keys for other matrix servers.
+type Database struct {
+	statements serverKeyStatements
+}
+
+// NewDatabase prepares a new key database.
+// It creates the necessary tables if they don't already exist.
+// It prepares all the SQL statements that it will use.
+// Returns an error if there was a problem talking to the database.
+func NewDatabase(
+	dataSourceName string,
+	serverName gomatrixserverlib.ServerName,
+	serverKey ed25519.PublicKey,
+	serverKeyID gomatrixserverlib.KeyID,
+) (*Database, error) {
+	db, err := sql.Open("sqlite3", dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	d := &Database{}
+	err = d.statements.prepare(db)
+	if err != nil {
+		return nil, err
+	}
+	// Store our own keys so that we don't end up making HTTP requests to find our
+	// own keys
+	index := gomatrixserverlib.PublicKeyLookupRequest{
+		ServerName: serverName,
+		KeyID:      serverKeyID,
+	}
+	value := gomatrixserverlib.PublicKeyLookupResult{
+		VerifyKey: gomatrixserverlib.VerifyKey{
+			Key: gomatrixserverlib.Base64String(serverKey),
+		},
+		ValidUntilTS: math.MaxUint64 >> 1,
+		ExpiredTS:    gomatrixserverlib.PublicKeyNotExpired,
+	}
+	err = d.StoreKeys(
+		context.Background(),
+		map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult{
+			index: value,
+		},
+	)
+	if err != nil {
+		return nil, err
+	}
+	return d, nil
+}
+
+// FetcherName implements KeyFetcher
+func (d Database) FetcherName() string {
+	return "KeyDatabase"
+}
+
+// FetchKeys implements gomatrixserverlib.KeyDatabase
+func (d *Database) FetchKeys(
+	ctx context.Context,
+	requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
+) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
+	return d.statements.bulkSelectServerKeys(ctx, requests)
+}
+
+// StoreKeys implements gomatrixserverlib.KeyDatabase
+func (d *Database) StoreKeys(
+	ctx context.Context,
+	keyMap map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult,
+) error {
+	// TODO: Inserting all the keys within a single transaction may
+	// be more efficient since the transaction overhead can be quite
+	// high for a single insert statement.
+	var lastErr error
+	for request, keys := range keyMap {
+		if err := d.statements.upsertServerKeys(ctx, request, keys); err != nil {
+			// Rather than returning immediately on error we try to insert the
+			// remaining keys.
+			// Since we are inserting the keys outside of a transaction it is
+			// possible for some of the inserts to succeed even though some
+			// of the inserts have failed.
+			// Ensuring that we always insert all the keys we can means that
+			// this behaviour won't depend on the iteration order of the map.
+			lastErr = err
+		}
+	}
+	return lastErr
+}
diff --git a/common/keydb/sqlite3/server_key_table.go b/common/keydb/sqlite3/server_key_table.go
new file mode 100644
index 00000000..6c33f30a
--- /dev/null
+++ b/common/keydb/sqlite3/server_key_table.go
@@ -0,0 +1,142 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const serverKeysSchema = `
+-- A cache of signing keys downloaded from remote servers.
+CREATE TABLE IF NOT EXISTS keydb_server_keys (
+	-- The name of the matrix server the key is for.
+	server_name TEXT NOT NULL,
+	-- The ID of the server key.
+	server_key_id TEXT NOT NULL,
+	-- Combined server name and key ID separated by the ASCII unit separator
+	-- to make it easier to run bulk queries.
+	server_name_and_key_id TEXT NOT NULL,
+	-- When the key is valid until as a millisecond timestamp.
+	-- 0 if this is an expired key (in which case expired_ts will be non-zero)
+	valid_until_ts BIGINT NOT NULL,
+	-- When the key expired as a millisecond timestamp.
+	-- 0 if this is an active key (in which case valid_until_ts will be non-zero)
+	expired_ts BIGINT NOT NULL,
+	-- The base64-encoded public key.
+	server_key TEXT NOT NULL,
+	UNIQUE (server_name, server_key_id)
+);
+
+CREATE INDEX IF NOT EXISTS keydb_server_name_and_key_id ON keydb_server_keys (server_name_and_key_id);
+`
+
+const bulkSelectServerKeysSQL = "" +
+	"SELECT server_name, server_key_id, valid_until_ts, expired_ts, " +
+	"   server_key FROM keydb_server_keys" +
+	" WHERE server_name_and_key_id IN ($1)"
+
+const upsertServerKeysSQL = "" +
+	"INSERT INTO keydb_server_keys (server_name, server_key_id," +
+	" server_name_and_key_id, valid_until_ts, expired_ts, server_key)" +
+	" VALUES ($1, $2, $3, $4, $5, $6)" +
+	" ON CONFLICT (server_name, server_key_id)" +
+	" DO UPDATE SET valid_until_ts = $4, expired_ts = $5, server_key = $6"
+
+type serverKeyStatements struct {
+	bulkSelectServerKeysStmt *sql.Stmt
+	upsertServerKeysStmt     *sql.Stmt
+}
+
+func (s *serverKeyStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(serverKeysSchema)
+	if err != nil {
+		return
+	}
+	if s.bulkSelectServerKeysStmt, err = db.Prepare(bulkSelectServerKeysSQL); err != nil {
+		return
+	}
+	if s.upsertServerKeysStmt, err = db.Prepare(upsertServerKeysSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *serverKeyStatements) bulkSelectServerKeys(
+	ctx context.Context,
+	requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
+) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
+	var nameAndKeyIDs []string
+	for request := range requests {
+		nameAndKeyIDs = append(nameAndKeyIDs, nameAndKeyID(request))
+	}
+	stmt := s.bulkSelectServerKeysStmt
+	rows, err := stmt.QueryContext(ctx, pq.StringArray(nameAndKeyIDs))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult{}
+	for rows.Next() {
+		var serverName string
+		var keyID string
+		var key string
+		var validUntilTS int64
+		var expiredTS int64
+		if err = rows.Scan(&serverName, &keyID, &validUntilTS, &expiredTS, &key); err != nil {
+			return nil, err
+		}
+		r := gomatrixserverlib.PublicKeyLookupRequest{
+			ServerName: gomatrixserverlib.ServerName(serverName),
+			KeyID:      gomatrixserverlib.KeyID(keyID),
+		}
+		vk := gomatrixserverlib.VerifyKey{}
+		err = vk.Key.Decode(key)
+		if err != nil {
+			return nil, err
+		}
+		results[r] = gomatrixserverlib.PublicKeyLookupResult{
+			VerifyKey:    vk,
+			ValidUntilTS: gomatrixserverlib.Timestamp(validUntilTS),
+			ExpiredTS:    gomatrixserverlib.Timestamp(expiredTS),
+		}
+	}
+	return results, nil
+}
+
+func (s *serverKeyStatements) upsertServerKeys(
+	ctx context.Context,
+	request gomatrixserverlib.PublicKeyLookupRequest,
+	key gomatrixserverlib.PublicKeyLookupResult,
+) error {
+	_, err := s.upsertServerKeysStmt.ExecContext(
+		ctx,
+		string(request.ServerName),
+		string(request.KeyID),
+		nameAndKeyID(request),
+		key.ValidUntilTS,
+		key.ExpiredTS,
+		key.Key.Encode(),
+	)
+	return err
+}
+
+func nameAndKeyID(request gomatrixserverlib.PublicKeyLookupRequest) string {
+	return string(request.ServerName) + "\x1F" + string(request.KeyID)
+}
diff --git a/common/partition_offset_table.go b/common/partition_offset_table.go
index 6955ac36..6bc066a6 100644
--- a/common/partition_offset_table.go
+++ b/common/partition_offset_table.go
@@ -29,7 +29,7 @@ CREATE TABLE IF NOT EXISTS ${prefix}_partition_offsets (
     partition INTEGER NOT NULL,
     -- The 64-bit offset.
     partition_offset BIGINT NOT NULL,
-    CONSTRAINT ${prefix}_topic_partition_unique UNIQUE (topic, partition)
+    UNIQUE (topic, partition)
 );
 `
 
@@ -38,7 +38,7 @@ const selectPartitionOffsetsSQL = "" +
 
 const upsertPartitionOffsetsSQL = "" +
 	"INSERT INTO ${prefix}_partition_offsets (topic, partition, partition_offset) VALUES ($1, $2, $3)" +
-	" ON CONFLICT ON CONSTRAINT ${prefix}_topic_partition_unique" +
+	" ON CONFLICT (topic, partition)" +
 	" DO UPDATE SET partition_offset = $3"
 
 // PartitionOffsetStatements represents a set of statements that can be run on a partition_offsets table.
diff --git a/common/sql.go b/common/sql.go
index 7ac9ac14..97593020 100644
--- a/common/sql.go
+++ b/common/sql.go
@@ -16,6 +16,7 @@ package common
 
 import (
 	"database/sql"
+	"fmt"
 
 	"github.com/lib/pq"
 )
@@ -30,11 +31,13 @@ type Transaction interface {
 
 // EndTransaction ends a transaction.
 // If the transaction succeeded then it is committed, otherwise it is rolledback.
-func EndTransaction(txn Transaction, succeeded *bool) {
+// You MUST check the error returned from this function to be sure that the transaction
+// was applied correctly. For example, 'database is locked' errors in sqlite will happen here.
+func EndTransaction(txn Transaction, succeeded *bool) error {
 	if *succeeded {
-		txn.Commit() // nolint: errcheck
+		return txn.Commit() // nolint: errcheck
 	} else {
-		txn.Rollback() // nolint: errcheck
+		return txn.Rollback() // nolint: errcheck
 	}
 }
 
@@ -47,7 +50,12 @@ func WithTransaction(db *sql.DB, fn func(txn *sql.Tx) error) (err error) {
 		return
 	}
 	succeeded := false
-	defer EndTransaction(txn, &succeeded)
+	defer func() {
+		err2 := EndTransaction(txn, &succeeded)
+		if err == nil && err2 != nil { // failed to commit/rollback
+			err = err2
+		}
+	}()
 
 	err = fn(txn)
 	if err != nil {
@@ -74,3 +82,20 @@ func IsUniqueConstraintViolationErr(err error) bool {
 	pqErr, ok := err.(*pq.Error)
 	return ok && pqErr.Code == "23505"
 }
+
+// Hack of the century
+func QueryVariadic(count int) string {
+	return QueryVariadicOffset(count, 0)
+}
+
+func QueryVariadicOffset(count, offset int) string {
+	str := "("
+	for i := 0; i < count; i++ {
+		str += fmt.Sprintf("$%d", i+offset+1)
+		if i < (count - 1) {
+			str += ", "
+		}
+	}
+	str += ")"
+	return str
+}
diff --git a/docker/Dockerfile b/docker/Dockerfile
index c88b7761..29b27dde 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,9 +1,13 @@
+<<<<<<< HEAD
+FROM docker.io/golang:1.13.7-alpine3.11
+=======
 FROM docker.io/golang:1.13.6-alpine
+>>>>>>> master
 
 RUN mkdir /build
 
 WORKDIR /build
 
-RUN apk --update --no-cache add openssl bash git
+RUN apk --update --no-cache add openssl bash git build-base
 
 CMD ["bash", "docker/build.sh"]
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index 9cf67457..d738ed3f 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -1,13 +1,21 @@
 version: "3.4"
 services:
+  riot:
+    image: vectorim/riot-web
+    networks:
+      - internal
+    ports:
+      - "8500:80"
+
   monolith:
     container_name: dendrite_monolith
     hostname: monolith
-    entrypoint: ["bash", "./docker/services/monolith.sh"]
+    entrypoint: ["bash", "./docker/services/monolith.sh", "--config", "/etc/dendrite/dendrite.yaml"]
     build: ./
     volumes:
       - ..:/build
       - ./build/bin:/build/bin
+      - ../cfg:/etc/dendrite
     networks:
       - internal
     depends_on:
diff --git a/federationapi/federationapi.go b/federationapi/federationapi.go
index 53851bc5..ef57da88 100644
--- a/federationapi/federationapi.go
+++ b/federationapi/federationapi.go
@@ -32,8 +32,8 @@ import (
 // FederationAPI component.
 func SetupFederationAPIComponent(
 	base *basecomponent.BaseDendrite,
-	accountsDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountsDB accounts.Database,
+	deviceDB devices.Database,
 	federation *gomatrixserverlib.FederationClient,
 	keyRing *gomatrixserverlib.KeyRing,
 	aliasAPI roomserverAPI.RoomserverAliasAPI,
diff --git a/federationapi/routing/devices.go b/federationapi/routing/devices.go
index ba8af7a9..78021c12 100644
--- a/federationapi/routing/devices.go
+++ b/federationapi/routing/devices.go
@@ -30,7 +30,7 @@ type userDevicesResponse struct {
 // GetUserDevices for the given user id
 func GetUserDevices(
 	req *http.Request,
-	deviceDB *devices.Database,
+	deviceDB devices.Database,
 	userID string,
 ) util.JSONResponse {
 	localpart, err := userutil.ParseUsernameParam(userID, nil)
diff --git a/federationapi/routing/profile.go b/federationapi/routing/profile.go
index 3be729c2..31b7a343 100644
--- a/federationapi/routing/profile.go
+++ b/federationapi/routing/profile.go
@@ -30,7 +30,7 @@ import (
 // GetProfile implements GET /_matrix/federation/v1/query/profile
 func GetProfile(
 	httpReq *http.Request,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 	cfg *config.Dendrite,
 	asAPI appserviceAPI.AppServiceQueryAPI,
 ) util.JSONResponse {
diff --git a/federationapi/routing/routing.go b/federationapi/routing/routing.go
index 13ed24f3..3b119301 100644
--- a/federationapi/routing/routing.go
+++ b/federationapi/routing/routing.go
@@ -51,8 +51,8 @@ func Setup(
 	federationSenderAPI federationSenderAPI.FederationSenderQueryAPI,
 	keys gomatrixserverlib.KeyRing,
 	federation *gomatrixserverlib.FederationClient,
-	accountDB *accounts.Database,
-	deviceDB *devices.Database,
+	accountDB accounts.Database,
+	deviceDB devices.Database,
 ) {
 	v2keysmux := apiMux.PathPrefix(pathPrefixV2Keys).Subrouter()
 	v1fedmux := apiMux.PathPrefix(pathPrefixV1Federation).Subrouter()
diff --git a/federationapi/routing/threepid.go b/federationapi/routing/threepid.go
index 06e00eea..a22685f2 100644
--- a/federationapi/routing/threepid.go
+++ b/federationapi/routing/threepid.go
@@ -61,7 +61,7 @@ func CreateInvitesFrom3PIDInvites(
 	req *http.Request, queryAPI roomserverAPI.RoomserverQueryAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI, cfg *config.Dendrite,
 	producer *producers.RoomserverProducer, federation *gomatrixserverlib.FederationClient,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 ) util.JSONResponse {
 	var body invites
 	if reqErr := httputil.UnmarshalJSONRequest(req, &body); reqErr != nil {
@@ -174,7 +174,7 @@ func createInviteFrom3PIDInvite(
 	ctx context.Context, queryAPI roomserverAPI.RoomserverQueryAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI, cfg *config.Dendrite,
 	inv invite, federation *gomatrixserverlib.FederationClient,
-	accountDB *accounts.Database,
+	accountDB accounts.Database,
 ) (*gomatrixserverlib.Event, error) {
 	_, server, err := gomatrixserverlib.SplitID('@', inv.MXID)
 	if err != nil {
diff --git a/federationsender/storage/postgres/storage.go b/federationsender/storage/postgres/storage.go
index c60f6dc5..d97b5d29 100644
--- a/federationsender/storage/postgres/storage.go
+++ b/federationsender/storage/postgres/storage.go
@@ -87,7 +87,7 @@ func (d *Database) UpdateRoom(
 			return nil
 		}
 
-		if lastSentEventID != oldEventID {
+		if lastSentEventID != "" && lastSentEventID != oldEventID {
 			return types.EventIDMismatchError{
 				DatabaseID: lastSentEventID, RoomServerID: oldEventID,
 			}
diff --git a/federationsender/storage/sqlite3/joined_hosts_table.go b/federationsender/storage/sqlite3/joined_hosts_table.go
new file mode 100644
index 00000000..1437a062
--- /dev/null
+++ b/federationsender/storage/sqlite3/joined_hosts_table.go
@@ -0,0 +1,139 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/federationsender/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const joinedHostsSchema = `
+-- The joined_hosts table stores a list of m.room.member event ids in the
+-- current state for each room where the membership is "join".
+-- There will be an entry for every user that is joined to the room.
+CREATE TABLE IF NOT EXISTS federationsender_joined_hosts (
+    -- The string ID of the room.
+    room_id TEXT NOT NULL,
+    -- The event ID of the m.room.member join event.
+    event_id TEXT NOT NULL,
+    -- The domain part of the user ID the m.room.member event is for.
+    server_name TEXT NOT NULL
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS federatonsender_joined_hosts_event_id_idx
+    ON federationsender_joined_hosts (event_id);
+
+CREATE INDEX IF NOT EXISTS federatonsender_joined_hosts_room_id_idx
+    ON federationsender_joined_hosts (room_id)
+`
+
+const insertJoinedHostsSQL = "" +
+	"INSERT INTO federationsender_joined_hosts (room_id, event_id, server_name)" +
+	" VALUES ($1, $2, $3)"
+
+const deleteJoinedHostsSQL = "" +
+	"DELETE FROM federationsender_joined_hosts WHERE event_id = $1"
+
+const selectJoinedHostsSQL = "" +
+	"SELECT event_id, server_name FROM federationsender_joined_hosts" +
+	" WHERE room_id = $1"
+
+type joinedHostsStatements struct {
+	insertJoinedHostsStmt *sql.Stmt
+	deleteJoinedHostsStmt *sql.Stmt
+	selectJoinedHostsStmt *sql.Stmt
+}
+
+func (s *joinedHostsStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(joinedHostsSchema)
+	if err != nil {
+		return
+	}
+	if s.insertJoinedHostsStmt, err = db.Prepare(insertJoinedHostsSQL); err != nil {
+		return
+	}
+	if s.deleteJoinedHostsStmt, err = db.Prepare(deleteJoinedHostsSQL); err != nil {
+		return
+	}
+	if s.selectJoinedHostsStmt, err = db.Prepare(selectJoinedHostsSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *joinedHostsStatements) insertJoinedHosts(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomID, eventID string,
+	serverName gomatrixserverlib.ServerName,
+) error {
+	stmt := common.TxStmt(txn, s.insertJoinedHostsStmt)
+	_, err := stmt.ExecContext(ctx, roomID, eventID, serverName)
+	return err
+}
+
+func (s *joinedHostsStatements) deleteJoinedHosts(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) error {
+	for _, eventID := range eventIDs {
+		stmt := common.TxStmt(txn, s.deleteJoinedHostsStmt)
+		if _, err := stmt.ExecContext(ctx, eventID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *joinedHostsStatements) selectJoinedHostsWithTx(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) ([]types.JoinedHost, error) {
+	stmt := common.TxStmt(txn, s.selectJoinedHostsStmt)
+	return joinedHostsFromStmt(ctx, stmt, roomID)
+}
+
+func (s *joinedHostsStatements) selectJoinedHosts(
+	ctx context.Context, roomID string,
+) ([]types.JoinedHost, error) {
+	return joinedHostsFromStmt(ctx, s.selectJoinedHostsStmt, roomID)
+}
+
+func joinedHostsFromStmt(
+	ctx context.Context, stmt *sql.Stmt, roomID string,
+) ([]types.JoinedHost, error) {
+	rows, err := stmt.QueryContext(ctx, roomID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	var result []types.JoinedHost
+	for rows.Next() {
+		var eventID, serverName string
+		if err = rows.Scan(&eventID, &serverName); err != nil {
+			return nil, err
+		}
+		result = append(result, types.JoinedHost{
+			MemberEventID: eventID,
+			ServerName:    gomatrixserverlib.ServerName(serverName),
+		})
+	}
+
+	return result, nil
+}
diff --git a/federationsender/storage/sqlite3/room_table.go b/federationsender/storage/sqlite3/room_table.go
new file mode 100644
index 00000000..6361400d
--- /dev/null
+++ b/federationsender/storage/sqlite3/room_table.go
@@ -0,0 +1,101 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+)
+
+const roomSchema = `
+CREATE TABLE IF NOT EXISTS federationsender_rooms (
+    -- The string ID of the room
+    room_id TEXT PRIMARY KEY,
+    -- The most recent event state by the room server.
+    -- We can use this to tell if our view of the room state has become
+    -- desynchronised.
+    last_event_id TEXT NOT NULL
+);`
+
+const insertRoomSQL = "" +
+	"INSERT INTO federationsender_rooms (room_id, last_event_id) VALUES ($1, '')" +
+	" ON CONFLICT DO NOTHING"
+
+const selectRoomForUpdateSQL = "" +
+	"SELECT last_event_id FROM federationsender_rooms WHERE room_id = $1"
+
+const updateRoomSQL = "" +
+	"UPDATE federationsender_rooms SET last_event_id = $2 WHERE room_id = $1"
+
+type roomStatements struct {
+	insertRoomStmt          *sql.Stmt
+	selectRoomForUpdateStmt *sql.Stmt
+	updateRoomStmt          *sql.Stmt
+}
+
+func (s *roomStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(roomSchema)
+	if err != nil {
+		return
+	}
+
+	if s.insertRoomStmt, err = db.Prepare(insertRoomSQL); err != nil {
+		return
+	}
+	if s.selectRoomForUpdateStmt, err = db.Prepare(selectRoomForUpdateSQL); err != nil {
+		return
+	}
+	if s.updateRoomStmt, err = db.Prepare(updateRoomSQL); err != nil {
+		return
+	}
+	return
+}
+
+// insertRoom inserts the room if it didn't already exist.
+// If the room didn't exist then last_event_id is set to the empty string.
+func (s *roomStatements) insertRoom(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) error {
+	_, err := common.TxStmt(txn, s.insertRoomStmt).ExecContext(ctx, roomID)
+	return err
+}
+
+// selectRoomForUpdate locks the row for the room and returns the last_event_id.
+// The row must already exist in the table. Callers can ensure that the row
+// exists by calling insertRoom first.
+func (s *roomStatements) selectRoomForUpdate(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (string, error) {
+	var lastEventID string
+	stmt := common.TxStmt(txn, s.selectRoomForUpdateStmt)
+	err := stmt.QueryRowContext(ctx, roomID).Scan(&lastEventID)
+	if err != nil {
+		return "", err
+	}
+	return lastEventID, nil
+}
+
+// updateRoom updates the last_event_id for the room. selectRoomForUpdate should
+// have already been called earlier within the transaction.
+func (s *roomStatements) updateRoom(
+	ctx context.Context, txn *sql.Tx, roomID, lastEventID string,
+) error {
+	stmt := common.TxStmt(txn, s.updateRoomStmt)
+	_, err := stmt.ExecContext(ctx, roomID, lastEventID)
+	return err
+}
diff --git a/federationsender/storage/sqlite3/storage.go b/federationsender/storage/sqlite3/storage.go
new file mode 100644
index 00000000..f9cfaa99
--- /dev/null
+++ b/federationsender/storage/sqlite3/storage.go
@@ -0,0 +1,124 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/federationsender/types"
+)
+
+// Database stores information needed by the federation sender
+type Database struct {
+	joinedHostsStatements
+	roomStatements
+	common.PartitionOffsetStatements
+	db *sql.DB
+}
+
+// NewDatabase opens a new database
+func NewDatabase(dataSourceName string) (*Database, error) {
+	var result Database
+	var err error
+	if result.db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = result.prepare(); err != nil {
+		return nil, err
+	}
+	return &result, nil
+}
+
+func (d *Database) prepare() error {
+	var err error
+
+	if err = d.joinedHostsStatements.prepare(d.db); err != nil {
+		return err
+	}
+
+	if err = d.roomStatements.prepare(d.db); err != nil {
+		return err
+	}
+
+	return d.PartitionOffsetStatements.Prepare(d.db, "federationsender")
+}
+
+// UpdateRoom updates the joined hosts for a room and returns what the joined
+// hosts were before the update, or nil if this was a duplicate message.
+// This is called when we receive a message from kafka, so we pass in
+// oldEventID and newEventID to check that we haven't missed any messages or
+// this isn't a duplicate message.
+func (d *Database) UpdateRoom(
+	ctx context.Context,
+	roomID, oldEventID, newEventID string,
+	addHosts []types.JoinedHost,
+	removeHosts []string,
+) (joinedHosts []types.JoinedHost, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		err = d.insertRoom(ctx, txn, roomID)
+		if err != nil {
+			return err
+		}
+
+		lastSentEventID, err := d.selectRoomForUpdate(ctx, txn, roomID)
+		if err != nil {
+			return err
+		}
+
+		if lastSentEventID == newEventID {
+			// We've handled this message before, so let's just ignore it.
+			// We can only get a duplicate for the last message we processed,
+			// so its enough just to compare the newEventID with lastSentEventID
+			return nil
+		}
+
+		if lastSentEventID != "" && lastSentEventID != oldEventID {
+			return types.EventIDMismatchError{
+				DatabaseID: lastSentEventID, RoomServerID: oldEventID,
+			}
+		}
+
+		joinedHosts, err = d.selectJoinedHostsWithTx(ctx, txn, roomID)
+		if err != nil {
+			return err
+		}
+
+		for _, add := range addHosts {
+			err = d.insertJoinedHosts(ctx, txn, roomID, add.MemberEventID, add.ServerName)
+			if err != nil {
+				return err
+			}
+		}
+		if err = d.deleteJoinedHosts(ctx, txn, removeHosts); err != nil {
+			return err
+		}
+		return d.updateRoom(ctx, txn, roomID, newEventID)
+	})
+	return
+}
+
+// GetJoinedHosts returns the currently joined hosts for room,
+// as known to federationserver.
+// Returns an error if something goes wrong.
+func (d *Database) GetJoinedHosts(
+	ctx context.Context, roomID string,
+) ([]types.JoinedHost, error) {
+	return d.selectJoinedHosts(ctx, roomID)
+}
diff --git a/federationsender/storage/storage.go b/federationsender/storage/storage.go
index 4ce151c7..e83c1e9d 100644
--- a/federationsender/storage/storage.go
+++ b/federationsender/storage/storage.go
@@ -20,6 +20,7 @@ import (
 
 	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/dendrite/federationsender/storage/postgres"
+	"github.com/matrix-org/dendrite/federationsender/storage/sqlite3"
 	"github.com/matrix-org/dendrite/federationsender/types"
 )
 
@@ -36,6 +37,8 @@ func NewDatabase(dataSourceName string) (Database, error) {
 		return postgres.NewDatabase(dataSourceName)
 	}
 	switch uri.Scheme {
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName)
 	case "postgres":
 		return postgres.NewDatabase(dataSourceName)
 	default:
diff --git a/go.mod b/go.mod
index 990b839e..2d442cd0 100644
--- a/go.mod
+++ b/go.mod
@@ -1,30 +1,30 @@
 module github.com/matrix-org/dendrite
 
 require (
-	github.com/Shopify/sarama v0.0.0-20170127151855-574d3147eee3
+	github.com/DataDog/zstd v1.4.4 // indirect
 	github.com/Shopify/toxiproxy v2.1.4+incompatible // indirect
 	github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd // indirect
-	github.com/eapache/go-resiliency v0.0.0-20160104191539-b86b1ec0dd42 // indirect
-	github.com/eapache/go-xerial-snappy v0.0.0-20160609142408-bb955e01b934 // indirect
+	github.com/eapache/go-resiliency v1.2.0 // indirect
+	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 // indirect
 	github.com/eapache/queue v1.1.0 // indirect
-	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
+	github.com/frankban/quicktest v1.7.2 // indirect
+	github.com/golang/snappy v0.0.1 // indirect
 	github.com/gorilla/mux v1.7.3
-	github.com/klauspost/crc32 v0.0.0-20161016154125-cb6bfca970f6 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/lib/pq v1.2.0
 	github.com/matrix-org/dugong v0.0.0-20171220115018-ea0a4690a0d5
 	github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
 	github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5
-	github.com/matrix-org/naffka v0.0.0-20171115094957-662bfd0841d0
+	github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1
 	github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5
+	github.com/mattn/go-sqlite3 v2.0.2+incompatible
 	github.com/miekg/dns v1.1.12 // indirect
 	github.com/nfnt/resize v0.0.0-20160724205520-891127d8d1b5
 	github.com/opentracing/opentracing-go v1.0.2
-	github.com/pierrec/lz4 v0.0.0-20161206202305-5c9560bfa9ac // indirect
-	github.com/pierrec/xxHash v0.0.0-20160112165351-5a004441f897 // indirect
+	github.com/pierrec/lz4 v2.4.1+incompatible // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.2.1
-	github.com/rcrowley/go-metrics v0.0.0-20161128210544-1f30fe9094a5 // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563 // indirect
 	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.4.0 // indirect
 	github.com/uber-go/atomic v1.3.0 // indirect
@@ -34,7 +34,7 @@ require (
 	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 	golang.org/x/net v0.0.0-20190620200207-3b0461eec859 // indirect
 	golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6 // indirect
-	gopkg.in/Shopify/sarama.v1 v1.11.0
+	gopkg.in/Shopify/sarama.v1 v1.20.1
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 	gopkg.in/h2non/bimg.v1 v1.0.18
 	gopkg.in/yaml.v2 v2.2.2
diff --git a/go.sum b/go.sum
index 42a145d6..7c8732f6 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/Shopify/sarama v0.0.0-20170127151855-574d3147eee3 h1:j6BAEHYn1kUyW2j7kY0mOJ/R8A0qWwXpvUAEHGemm/g=
-github.com/Shopify/sarama v0.0.0-20170127151855-574d3147eee3/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
+github.com/DataDog/zstd v1.4.4 h1:+IawcoXhCBylN7ccwdwf8LOH2jKq7NavGpEPanrlTzE=
+github.com/DataDog/zstd v1.4.4/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible h1:TKdv8HiTLgE5wdJuEML90aBgNWsokNbMijUGhmcoBJc=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
@@ -18,13 +18,15 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/eapache/go-resiliency v0.0.0-20160104191539-b86b1ec0dd42 h1:f8ERmXYuaC+kCSv2w+y3rBK/oVu6If4DEm3jywJJ0hc=
-github.com/eapache/go-resiliency v0.0.0-20160104191539-b86b1ec0dd42/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
-github.com/eapache/go-xerial-snappy v0.0.0-20160609142408-bb955e01b934 h1:oGLoaVIefp3tiOgi7+KInR/nNPvEpPM6GFo+El7fd14=
-github.com/eapache/go-xerial-snappy v0.0.0-20160609142408-bb955e01b934/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
+github.com/eapache/go-resiliency v1.2.0 h1:v7g92e/KSN71Rq7vSThKaWIq68fL4YHvWyiUKorFR1Q=
+github.com/eapache/go-resiliency v1.2.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
+github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 h1:YEetp8/yCZMuEPMUDHG0CW/brkkEp8mzqk2+ODEitlw=
+github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
 github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
 github.com/frankban/quicktest v1.0.0/go.mod h1:R98jIehRai+d1/3Hv2//jOVCTJhW1VBavT6B6CuGq2k=
+github.com/frankban/quicktest v1.7.2 h1:2QxQoC1TS09S7fhCPsrvqYdvP1H5M1P1ih5ABm3BTYk=
+github.com/frankban/quicktest v1.7.2/go.mod h1:jaStnuzAqU1AJdCO0l53JDCJrVDKcS03DbaAcR7Ks/o=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
@@ -35,11 +37,13 @@ github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db h1:woRePGFeVFfLKN/pOkfl+p/TAqKOfFu+7KPlMVpok/w=
-github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
+github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
@@ -48,8 +52,6 @@ github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542/go.mod h1:Ow0tF8D4Kplb
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
-github.com/klauspost/crc32 v0.0.0-20161016154125-cb6bfca970f6 h1:KAZ1BW2TCmT6PRihDPpocIy1QTtsAsrx6TneU/4+CMg=
-github.com/klauspost/crc32 v0.0.0-20161016154125-cb6bfca970f6/go.mod h1:+ZoRqAPRLkC4NPOvfYeR5KNOrY6TD+/sAC3HXPZgDYg=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.2 h1:DB17ag19krx9CFsz4o3enTrPXyIXCl+2iCXH/aMAp9s=
 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
@@ -69,10 +71,12 @@ github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26 h1:Hr3zjRsq2bh
 github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5 h1:kmRjpmFOenVpOaV/DRlo9p6z/IbOKlUC+hhKsAAh8Qg=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
-github.com/matrix-org/naffka v0.0.0-20171115094957-662bfd0841d0 h1:p7WTwG+aXM86+yVrYAiCMW3ZHSmotVvuRbjtt3jC+4A=
-github.com/matrix-org/naffka v0.0.0-20171115094957-662bfd0841d0/go.mod h1:cXoYQIENbdWIQHt1SyCo6Bl3C3raHwJ0wgVrXHSqf+A=
+github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1 h1:osLoFdOy+ChQqVUn2PeTDETFftVkl4w9t/OW18g3lnk=
+github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1/go.mod h1:cXoYQIENbdWIQHt1SyCo6Bl3C3raHwJ0wgVrXHSqf+A=
 github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5 h1:W7l5CP4V7wPyPb4tYE11dbmeAOwtFQBTW0rf4OonOS8=
 github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5/go.mod h1:lePuOiXLNDott7NZfnQvJk0lAZ5HgvIuWGhel6J+RLA=
+github.com/mattn/go-sqlite3 v2.0.2+incompatible h1:qzw9c2GNT8UFrgWNDhCTqRqYUSmu/Dav/9Z58LGpk7U=
+github.com/mattn/go-sqlite3 v2.0.2+incompatible/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/miekg/dns v1.1.4 h1:rCMZsU2ScVSYcAsOXgmC6+AKOK+6pmQTOcw03nfwYV0=
@@ -90,10 +94,8 @@ github.com/nfnt/resize v0.0.0-20160724205520-891127d8d1b5 h1:BvoENQQU+fZ9uukda/R
 github.com/nfnt/resize v0.0.0-20160724205520-891127d8d1b5/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/opentracing/opentracing-go v1.0.2 h1:3jA2P6O1F9UOrWVpwrIo17pu01KWvNWg4X946/Y5Zwg=
 github.com/opentracing/opentracing-go v1.0.2/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
-github.com/pierrec/lz4 v0.0.0-20161206202305-5c9560bfa9ac h1:tKcxwAA5OHUQjL6sWsuCIcP9OnzN+RwKfvomtIOsfy8=
-github.com/pierrec/lz4 v0.0.0-20161206202305-5c9560bfa9ac/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
-github.com/pierrec/xxHash v0.0.0-20160112165351-5a004441f897 h1:jp3jc/PyyTrTKjJJ6rWnhTbmo7tGgBFyG9AL5FIrO1I=
-github.com/pierrec/xxHash v0.0.0-20160112165351-5a004441f897/go.mod h1:w2waW5Zoa/Wc4Yqe0wgrIYAGKqRMf7czn2HNKXmuL+I=
+github.com/pierrec/lz4 v2.4.1+incompatible h1:mFe7ttWaflA46Mhqh+jUfjp2qTbPYxLB2/OyBppH9dg=
+github.com/pierrec/lz4 v2.4.1+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -114,8 +116,8 @@ github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.5 h1:3+auTFlqw+ZaQYJARz6ArODtkaIwtvBTx3N2NehQlL8=
 github.com/prometheus/procfs v0.0.5/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
-github.com/rcrowley/go-metrics v0.0.0-20161128210544-1f30fe9094a5 h1:gwcdIpH6NU2iF8CmcqD+CP6+1CkRBOhHaPR+iu6raBY=
-github.com/rcrowley/go-metrics v0.0.0-20161128210544-1f30fe9094a5/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
+github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563 h1:dY6ETXrvDG7Sa4vE8ZQG4yqWg6UnOcbqTAahkV813vQ=
+github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.3.0 h1:hI/7Q+DtNZ2kINb6qt/lS+IyXnHQe9e90POfeewL/ME=
 github.com/sirupsen/logrus v1.3.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
@@ -172,8 +174,8 @@ golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191010194322-b09406accb47 h1:/XfQ9z7ib8eEJX2hdgFTZJ/ntt0swNk5oYBziWeTCvY=
 golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-gopkg.in/Shopify/sarama.v1 v1.11.0 h1:/3kaCyeYaPbr59IBjeqhIcUOB1vXlIVqXAYa5g5C5F0=
-gopkg.in/Shopify/sarama.v1 v1.11.0/go.mod h1:AxnvoaevB2nBjNK17cG61A3LleFcWFwVBHBt+cot4Oc=
+gopkg.in/Shopify/sarama.v1 v1.20.1 h1:Gi09A3fJXm0Jgt8kuKZ8YK+r60GfYn7MQuEmI3oq6hE=
+gopkg.in/Shopify/sarama.v1 v1.20.1/go.mod h1:AxnvoaevB2nBjNK17cG61A3LleFcWFwVBHBt+cot4Oc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/mediaapi/mediaapi.go b/mediaapi/mediaapi.go
index 46d1c328..f2e614c1 100644
--- a/mediaapi/mediaapi.go
+++ b/mediaapi/mediaapi.go
@@ -27,7 +27,7 @@ import (
 // component.
 func SetupMediaAPIComponent(
 	base *basecomponent.BaseDendrite,
-	deviceDB *devices.Database,
+	deviceDB devices.Database,
 ) {
 	mediaDB, err := storage.Open(string(base.Cfg.Database.MediaAPI))
 	if err != nil {
diff --git a/mediaapi/routing/routing.go b/mediaapi/routing/routing.go
index dcc6ac06..71dad19b 100644
--- a/mediaapi/routing/routing.go
+++ b/mediaapi/routing/routing.go
@@ -44,7 +44,7 @@ func Setup(
 	apiMux *mux.Router,
 	cfg *config.Dendrite,
 	db storage.Database,
-	deviceDB *devices.Database,
+	deviceDB devices.Database,
 	client *gomatrixserverlib.Client,
 ) {
 	r0mux := apiMux.PathPrefix(pathPrefixR0).Subrouter()
diff --git a/publicroomsapi/publicroomsapi.go b/publicroomsapi/publicroomsapi.go
index 181966d3..1e2a3f9b 100644
--- a/publicroomsapi/publicroomsapi.go
+++ b/publicroomsapi/publicroomsapi.go
@@ -28,7 +28,7 @@ import (
 // component.
 func SetupPublicRoomsAPIComponent(
 	base *basecomponent.BaseDendrite,
-	deviceDB *devices.Database,
+	deviceDB devices.Database,
 	rsQueryAPI roomserverAPI.RoomserverQueryAPI,
 ) {
 	publicRoomsDB, err := storage.NewPublicRoomsServerDatabase(string(base.Cfg.Database.PublicRoomsAPI))
diff --git a/publicroomsapi/routing/routing.go b/publicroomsapi/routing/routing.go
index 3d2d2ac0..1953e04f 100644
--- a/publicroomsapi/routing/routing.go
+++ b/publicroomsapi/routing/routing.go
@@ -34,7 +34,7 @@ const pathPrefixR0 = "/_matrix/client/r0"
 // Due to Setup being used to call many other functions, a gocyclo nolint is
 // applied:
 // nolint: gocyclo
-func Setup(apiMux *mux.Router, deviceDB *devices.Database, publicRoomsDB storage.Database) {
+func Setup(apiMux *mux.Router, deviceDB devices.Database, publicRoomsDB storage.Database) {
 	r0mux := apiMux.PathPrefix(pathPrefixR0).Subrouter()
 
 	authData := auth.Data{
diff --git a/publicroomsapi/storage/sqlite3/prepare.go b/publicroomsapi/storage/sqlite3/prepare.go
new file mode 100644
index 00000000..482dfa2b
--- /dev/null
+++ b/publicroomsapi/storage/sqlite3/prepare.go
@@ -0,0 +1,36 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"database/sql"
+)
+
+// a statementList is a list of SQL statements to prepare and a pointer to where to store the resulting prepared statement.
+type statementList []struct {
+	statement **sql.Stmt
+	sql       string
+}
+
+// prepare the SQL for each statement in the list and assign the result to the prepared statement.
+func (s statementList) prepare(db *sql.DB) (err error) {
+	for _, statement := range s {
+		if *statement.statement, err = db.Prepare(statement.sql); err != nil {
+			return
+		}
+	}
+	return
+}
diff --git a/publicroomsapi/storage/sqlite3/public_rooms_table.go b/publicroomsapi/storage/sqlite3/public_rooms_table.go
new file mode 100644
index 00000000..06c74a33
--- /dev/null
+++ b/publicroomsapi/storage/sqlite3/public_rooms_table.go
@@ -0,0 +1,277 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/publicroomsapi/types"
+)
+
+var editableAttributes = []string{
+	"aliases",
+	"canonical_alias",
+	"name",
+	"topic",
+	"world_readable",
+	"guest_can_join",
+	"avatar_url",
+	"visibility",
+}
+
+const publicRoomsSchema = `
+-- Stores all of the rooms with data needed to create the server's room directory
+CREATE TABLE IF NOT EXISTS publicroomsapi_public_rooms(
+	-- The room's ID
+	room_id TEXT NOT NULL PRIMARY KEY,
+	-- Number of joined members in the room
+	joined_members INTEGER NOT NULL DEFAULT 0,
+	-- Aliases of the room (empty array if none)
+	aliases TEXT[] NOT NULL DEFAULT '{}'::TEXT[],
+	-- Canonical alias of the room (empty string if none)
+	canonical_alias TEXT NOT NULL DEFAULT '',
+	-- Name of the room (empty string if none)
+	name TEXT NOT NULL DEFAULT '',
+	-- Topic of the room (empty string if none)
+	topic TEXT NOT NULL DEFAULT '',
+	-- Is the room world readable?
+	world_readable BOOLEAN NOT NULL DEFAULT false,
+	-- Can guest join the room?
+	guest_can_join BOOLEAN NOT NULL DEFAULT false,
+	-- URL of the room avatar (empty string if none)
+	avatar_url TEXT NOT NULL DEFAULT '',
+	-- Visibility of the room: true means the room is publicly visible, false
+	-- means the room is private
+	visibility BOOLEAN NOT NULL DEFAULT false
+);
+`
+
+const countPublicRoomsSQL = "" +
+	"SELECT COUNT(*) FROM publicroomsapi_public_rooms" +
+	" WHERE visibility = true"
+
+const selectPublicRoomsSQL = "" +
+	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
+	" FROM publicroomsapi_public_rooms WHERE visibility = true" +
+	" ORDER BY joined_members DESC" +
+	" OFFSET $1"
+
+const selectPublicRoomsWithLimitSQL = "" +
+	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
+	" FROM publicroomsapi_public_rooms WHERE visibility = true" +
+	" ORDER BY joined_members DESC" +
+	" OFFSET $1 LIMIT $2"
+
+const selectPublicRoomsWithFilterSQL = "" +
+	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
+	" FROM publicroomsapi_public_rooms" +
+	" WHERE visibility = true" +
+	" AND (LOWER(name) LIKE LOWER($1)" +
+	" OR LOWER(topic) LIKE LOWER($1)" +
+	" OR LOWER(ARRAY_TO_STRING(aliases, ',')) LIKE LOWER($1))" +
+	" ORDER BY joined_members DESC" +
+	" OFFSET $2"
+
+const selectPublicRoomsWithLimitAndFilterSQL = "" +
+	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
+	" FROM publicroomsapi_public_rooms" +
+	" WHERE visibility = true" +
+	" AND (LOWER(name) LIKE LOWER($1)" +
+	" OR LOWER(topic) LIKE LOWER($1)" +
+	" OR LOWER(ARRAY_TO_STRING(aliases, ',')) LIKE LOWER($1))" +
+	" ORDER BY joined_members DESC" +
+	" OFFSET $2 LIMIT $3"
+
+const selectRoomVisibilitySQL = "" +
+	"SELECT visibility FROM publicroomsapi_public_rooms" +
+	" WHERE room_id = $1"
+
+const insertNewRoomSQL = "" +
+	"INSERT INTO publicroomsapi_public_rooms(room_id)" +
+	" VALUES ($1)"
+
+const incrementJoinedMembersInRoomSQL = "" +
+	"UPDATE publicroomsapi_public_rooms" +
+	" SET joined_members = joined_members + 1" +
+	" WHERE room_id = $1"
+
+const decrementJoinedMembersInRoomSQL = "" +
+	"UPDATE publicroomsapi_public_rooms" +
+	" SET joined_members = joined_members - 1" +
+	" WHERE room_id = $1"
+
+const updateRoomAttributeSQL = "" +
+	"UPDATE publicroomsapi_public_rooms" +
+	" SET %s = $1" +
+	" WHERE room_id = $2"
+
+type publicRoomsStatements struct {
+	countPublicRoomsStmt                    *sql.Stmt
+	selectPublicRoomsStmt                   *sql.Stmt
+	selectPublicRoomsWithLimitStmt          *sql.Stmt
+	selectPublicRoomsWithFilterStmt         *sql.Stmt
+	selectPublicRoomsWithLimitAndFilterStmt *sql.Stmt
+	selectRoomVisibilityStmt                *sql.Stmt
+	insertNewRoomStmt                       *sql.Stmt
+	incrementJoinedMembersInRoomStmt        *sql.Stmt
+	decrementJoinedMembersInRoomStmt        *sql.Stmt
+	updateRoomAttributeStmts                map[string]*sql.Stmt
+}
+
+func (s *publicRoomsStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(publicRoomsSchema)
+	if err != nil {
+		return
+	}
+
+	stmts := statementList{
+		{&s.countPublicRoomsStmt, countPublicRoomsSQL},
+		{&s.selectPublicRoomsStmt, selectPublicRoomsSQL},
+		{&s.selectPublicRoomsWithLimitStmt, selectPublicRoomsWithLimitSQL},
+		{&s.selectPublicRoomsWithFilterStmt, selectPublicRoomsWithFilterSQL},
+		{&s.selectPublicRoomsWithLimitAndFilterStmt, selectPublicRoomsWithLimitAndFilterSQL},
+		{&s.selectRoomVisibilityStmt, selectRoomVisibilitySQL},
+		{&s.insertNewRoomStmt, insertNewRoomSQL},
+		{&s.incrementJoinedMembersInRoomStmt, incrementJoinedMembersInRoomSQL},
+		{&s.decrementJoinedMembersInRoomStmt, decrementJoinedMembersInRoomSQL},
+	}
+
+	if err = stmts.prepare(db); err != nil {
+		return
+	}
+
+	s.updateRoomAttributeStmts = make(map[string]*sql.Stmt)
+	for _, editable := range editableAttributes {
+		stmt := fmt.Sprintf(updateRoomAttributeSQL, editable)
+		if s.updateRoomAttributeStmts[editable], err = db.Prepare(stmt); err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+func (s *publicRoomsStatements) countPublicRooms(ctx context.Context) (nb int64, err error) {
+	err = s.countPublicRoomsStmt.QueryRowContext(ctx).Scan(&nb)
+	return
+}
+
+func (s *publicRoomsStatements) selectPublicRooms(
+	ctx context.Context, offset int64, limit int16, filter string,
+) ([]types.PublicRoom, error) {
+	var rows *sql.Rows
+	var err error
+
+	if len(filter) > 0 {
+		pattern := "%" + filter + "%"
+		if limit == 0 {
+			rows, err = s.selectPublicRoomsWithFilterStmt.QueryContext(
+				ctx, pattern, offset,
+			)
+		} else {
+			rows, err = s.selectPublicRoomsWithLimitAndFilterStmt.QueryContext(
+				ctx, pattern, offset, limit,
+			)
+		}
+	} else {
+		if limit == 0 {
+			rows, err = s.selectPublicRoomsStmt.QueryContext(ctx, offset)
+		} else {
+			rows, err = s.selectPublicRoomsWithLimitStmt.QueryContext(
+				ctx, offset, limit,
+			)
+		}
+	}
+
+	if err != nil {
+		return []types.PublicRoom{}, nil
+	}
+
+	rooms := []types.PublicRoom{}
+	for rows.Next() {
+		var r types.PublicRoom
+		var aliases pq.StringArray
+
+		err = rows.Scan(
+			&r.RoomID, &r.NumJoinedMembers, &aliases, &r.CanonicalAlias,
+			&r.Name, &r.Topic, &r.WorldReadable, &r.GuestCanJoin, &r.AvatarURL,
+		)
+		if err != nil {
+			return rooms, err
+		}
+
+		r.Aliases = aliases
+
+		rooms = append(rooms, r)
+	}
+
+	return rooms, nil
+}
+
+func (s *publicRoomsStatements) selectRoomVisibility(
+	ctx context.Context, roomID string,
+) (v bool, err error) {
+	err = s.selectRoomVisibilityStmt.QueryRowContext(ctx, roomID).Scan(&v)
+	return
+}
+
+func (s *publicRoomsStatements) insertNewRoom(
+	ctx context.Context, roomID string,
+) error {
+	_, err := s.insertNewRoomStmt.ExecContext(ctx, roomID)
+	return err
+}
+
+func (s *publicRoomsStatements) incrementJoinedMembersInRoom(
+	ctx context.Context, roomID string,
+) error {
+	_, err := s.incrementJoinedMembersInRoomStmt.ExecContext(ctx, roomID)
+	return err
+}
+
+func (s *publicRoomsStatements) decrementJoinedMembersInRoom(
+	ctx context.Context, roomID string,
+) error {
+	_, err := s.decrementJoinedMembersInRoomStmt.ExecContext(ctx, roomID)
+	return err
+}
+
+func (s *publicRoomsStatements) updateRoomAttribute(
+	ctx context.Context, attrName string, attrValue attributeValue, roomID string,
+) error {
+	stmt, isEditable := s.updateRoomAttributeStmts[attrName]
+
+	if !isEditable {
+		return errors.New("Cannot edit " + attrName)
+	}
+
+	var value interface{}
+	switch v := attrValue.(type) {
+	case []string:
+		value = pq.StringArray(v)
+	case bool, string:
+		value = attrValue
+	default:
+		return errors.New("Unsupported attribute type, must be bool, string or []string")
+	}
+
+	_, err := stmt.ExecContext(ctx, value, roomID)
+	return err
+}
diff --git a/publicroomsapi/storage/sqlite3/storage.go b/publicroomsapi/storage/sqlite3/storage.go
new file mode 100644
index 00000000..dcb8920f
--- /dev/null
+++ b/publicroomsapi/storage/sqlite3/storage.go
@@ -0,0 +1,256 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/publicroomsapi/types"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// PublicRoomsServerDatabase represents a public rooms server database.
+type PublicRoomsServerDatabase struct {
+	db *sql.DB
+	common.PartitionOffsetStatements
+	statements publicRoomsStatements
+}
+
+type attributeValue interface{}
+
+// NewPublicRoomsServerDatabase creates a new public rooms server database.
+func NewPublicRoomsServerDatabase(dataSourceName string) (*PublicRoomsServerDatabase, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	storage := PublicRoomsServerDatabase{
+		db: db,
+	}
+	if err = storage.PartitionOffsetStatements.Prepare(db, "publicroomsapi"); err != nil {
+		return nil, err
+	}
+	if err = storage.statements.prepare(db); err != nil {
+		return nil, err
+	}
+	return &storage, nil
+}
+
+// GetRoomVisibility returns the room visibility as a boolean: true if the room
+// is publicly visible, false if not.
+// Returns an error if the retrieval failed.
+func (d *PublicRoomsServerDatabase) GetRoomVisibility(
+	ctx context.Context, roomID string,
+) (bool, error) {
+	return d.statements.selectRoomVisibility(ctx, roomID)
+}
+
+// SetRoomVisibility updates the visibility attribute of a room. This attribute
+// must be set to true if the room is publicly visible, false if not.
+// Returns an error if the update failed.
+func (d *PublicRoomsServerDatabase) SetRoomVisibility(
+	ctx context.Context, visible bool, roomID string,
+) error {
+	return d.statements.updateRoomAttribute(ctx, "visibility", visible, roomID)
+}
+
+// CountPublicRooms returns the number of room set as publicly visible on the server.
+// Returns an error if the retrieval failed.
+func (d *PublicRoomsServerDatabase) CountPublicRooms(ctx context.Context) (int64, error) {
+	return d.statements.countPublicRooms(ctx)
+}
+
+// GetPublicRooms returns an array containing the local rooms set as publicly visible, ordered by their number
+// of joined members. This array can be limited by a given number of elements, and offset by a given value.
+// If the limit is 0, doesn't limit the number of results. If the offset is 0 too, the array contains all
+// the rooms set as publicly visible on the server.
+// Returns an error if the retrieval failed.
+func (d *PublicRoomsServerDatabase) GetPublicRooms(
+	ctx context.Context, offset int64, limit int16, filter string,
+) ([]types.PublicRoom, error) {
+	return d.statements.selectPublicRooms(ctx, offset, limit, filter)
+}
+
+// UpdateRoomFromEvents iterate over a slice of state events and call
+// UpdateRoomFromEvent on each of them to update the database representation of
+// the rooms updated by each event.
+// The slice of events to remove is used to update the number of joined members
+// for the room in the database.
+// If the update triggered by one of the events failed, aborts the process and
+// returns an error.
+func (d *PublicRoomsServerDatabase) UpdateRoomFromEvents(
+	ctx context.Context,
+	eventsToAdd []gomatrixserverlib.Event,
+	eventsToRemove []gomatrixserverlib.Event,
+) error {
+	for _, event := range eventsToAdd {
+		if err := d.UpdateRoomFromEvent(ctx, event); err != nil {
+			return err
+		}
+	}
+
+	for _, event := range eventsToRemove {
+		if event.Type() == "m.room.member" {
+			if err := d.updateNumJoinedUsers(ctx, event, true); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// UpdateRoomFromEvent updates the database representation of a room from a Matrix event, by
+// checking the event's type to know which attribute to change and using the event's content
+// to define the new value of the attribute.
+// If the event doesn't match with any property used to compute the public room directory,
+// does nothing.
+// If something went wrong during the process, returns an error.
+func (d *PublicRoomsServerDatabase) UpdateRoomFromEvent(
+	ctx context.Context, event gomatrixserverlib.Event,
+) error {
+	// Process the event according to its type
+	switch event.Type() {
+	case "m.room.create":
+		return d.statements.insertNewRoom(ctx, event.RoomID())
+	case "m.room.member":
+		return d.updateNumJoinedUsers(ctx, event, false)
+	case "m.room.aliases":
+		return d.updateRoomAliases(ctx, event)
+	case "m.room.canonical_alias":
+		var content common.CanonicalAliasContent
+		field := &(content.Alias)
+		attrName := "canonical_alias"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.name":
+		var content common.NameContent
+		field := &(content.Name)
+		attrName := "name"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.topic":
+		var content common.TopicContent
+		field := &(content.Topic)
+		attrName := "topic"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.avatar":
+		var content common.AvatarContent
+		field := &(content.URL)
+		attrName := "avatar_url"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.history_visibility":
+		var content common.HistoryVisibilityContent
+		field := &(content.HistoryVisibility)
+		attrName := "world_readable"
+		strForTrue := "world_readable"
+		return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
+	case "m.room.guest_access":
+		var content common.GuestAccessContent
+		field := &(content.GuestAccess)
+		attrName := "guest_can_join"
+		strForTrue := "can_join"
+		return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
+	}
+
+	// If the event type didn't match, return with no error
+	return nil
+}
+
+// updateNumJoinedUsers updates the number of joined user in the database representation
+// of a room using a given "m.room.member" Matrix event.
+// If the membership property of the event isn't "join", ignores it and returs nil.
+// If the remove parameter is set to false, increments the joined members counter in the
+// database, if set to truem decrements it.
+// Returns an error if the update failed.
+func (d *PublicRoomsServerDatabase) updateNumJoinedUsers(
+	ctx context.Context, membershipEvent gomatrixserverlib.Event, remove bool,
+) error {
+	membership, err := membershipEvent.Membership()
+	if err != nil {
+		return err
+	}
+
+	if membership != gomatrixserverlib.Join {
+		return nil
+	}
+
+	if remove {
+		return d.statements.decrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
+	}
+	return d.statements.incrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
+}
+
+// updateStringAttribute updates a given string attribute in the database
+// representation of a room using a given string data field from content of the
+// Matrix event triggering the update.
+// Returns an error if decoding the Matrix event's content or updating the attribute
+// failed.
+func (d *PublicRoomsServerDatabase) updateStringAttribute(
+	ctx context.Context, attrName string, event gomatrixserverlib.Event,
+	content interface{}, field *string,
+) error {
+	if err := json.Unmarshal(event.Content(), content); err != nil {
+		return err
+	}
+
+	return d.statements.updateRoomAttribute(ctx, attrName, *field, event.RoomID())
+}
+
+// updateBooleanAttribute updates a given boolean attribute in the database
+// representation of a room using a given string data field from content of the
+// Matrix event triggering the update.
+// The attribute is set to true if the field matches a given string, false if not.
+// Returns an error if decoding the Matrix event's content or updating the attribute
+// failed.
+func (d *PublicRoomsServerDatabase) updateBooleanAttribute(
+	ctx context.Context, attrName string, event gomatrixserverlib.Event,
+	content interface{}, field *string, strForTrue string,
+) error {
+	if err := json.Unmarshal(event.Content(), content); err != nil {
+		return err
+	}
+
+	var attrValue bool
+	if *field == strForTrue {
+		attrValue = true
+	} else {
+		attrValue = false
+	}
+
+	return d.statements.updateRoomAttribute(ctx, attrName, attrValue, event.RoomID())
+}
+
+// updateRoomAliases decodes the content of a "m.room.aliases" Matrix event and update the list of aliases of
+// a given room with it.
+// Returns an error if decoding the Matrix event or updating the list failed.
+func (d *PublicRoomsServerDatabase) updateRoomAliases(
+	ctx context.Context, aliasesEvent gomatrixserverlib.Event,
+) error {
+	var content common.AliasesContent
+	if err := json.Unmarshal(aliasesEvent.Content(), &content); err != nil {
+		return err
+	}
+
+	return d.statements.updateRoomAttribute(
+		ctx, "aliases", content.Aliases, aliasesEvent.RoomID(),
+	)
+}
diff --git a/roomserver/input/events.go b/roomserver/input/events.go
index 03023a4a..a3b70753 100644
--- a/roomserver/input/events.go
+++ b/roomserver/input/events.go
@@ -196,7 +196,12 @@ func processInviteEvent(
 		return err
 	}
 	succeeded := false
-	defer common.EndTransaction(updater, &succeeded)
+	defer func() {
+		txerr := common.EndTransaction(updater, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
 
 	if updater.IsJoin() {
 		// If the user is joined to the room then that takes precedence over this
diff --git a/roomserver/input/latest_events.go b/roomserver/input/latest_events.go
index 7e03d544..f9fd1d5d 100644
--- a/roomserver/input/latest_events.go
+++ b/roomserver/input/latest_events.go
@@ -60,7 +60,12 @@ func updateLatestEvents(
 		return
 	}
 	succeeded := false
-	defer common.EndTransaction(updater, &succeeded)
+	defer func() {
+		txerr := common.EndTransaction(updater, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
 
 	u := latestEventsUpdater{
 		ctx: ctx, db: db, updater: updater, ow: ow, roomNID: roomNID,
diff --git a/roomserver/storage/sqlite3/event_json_table.go b/roomserver/storage/sqlite3/event_json_table.go
new file mode 100644
index 00000000..f6c83906
--- /dev/null
+++ b/roomserver/storage/sqlite3/event_json_table.go
@@ -0,0 +1,108 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const eventJSONSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_event_json (
+    event_nid INTEGER NOT NULL PRIMARY KEY,
+    event_json TEXT NOT NULL
+  );
+`
+
+const insertEventJSONSQL = `
+	INSERT INTO roomserver_event_json (event_nid, event_json) VALUES ($1, $2)
+	  ON CONFLICT DO NOTHING
+`
+
+// Bulk event JSON lookup by numeric event ID.
+// Sort by the numeric event ID.
+// This means that we can use binary search to lookup by numeric event ID.
+const bulkSelectEventJSONSQL = `
+	SELECT event_nid, event_json FROM roomserver_event_json
+	  WHERE event_nid IN ($1)
+	  ORDER BY event_nid ASC
+`
+
+type eventJSONStatements struct {
+	db                      *sql.DB
+	insertEventJSONStmt     *sql.Stmt
+	bulkSelectEventJSONStmt *sql.Stmt
+}
+
+func (s *eventJSONStatements) prepare(db *sql.DB) (err error) {
+	s.db = db
+	_, err = db.Exec(eventJSONSchema)
+	if err != nil {
+		return
+	}
+	return statementList{
+		{&s.insertEventJSONStmt, insertEventJSONSQL},
+		{&s.bulkSelectEventJSONStmt, bulkSelectEventJSONSQL},
+	}.prepare(db)
+}
+
+func (s *eventJSONStatements) insertEventJSON(
+	ctx context.Context, txn *sql.Tx, eventNID types.EventNID, eventJSON []byte,
+) error {
+	_, err := common.TxStmt(txn, s.insertEventJSONStmt).ExecContext(ctx, int64(eventNID), eventJSON)
+	return err
+}
+
+type eventJSONPair struct {
+	EventNID  types.EventNID
+	EventJSON []byte
+}
+
+func (s *eventJSONStatements) bulkSelectEventJSON(
+	ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
+) ([]eventJSONPair, error) {
+	iEventNIDs := make([]interface{}, len(eventNIDs))
+	for k, v := range eventNIDs {
+		iEventNIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventJSONSQL, "($1)", common.QueryVariadic(len(iEventNIDs)), 1)
+
+	rows, err := txn.QueryContext(ctx, selectOrig, iEventNIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	// We know that we will only get as many results as event NIDs
+	// because of the unique constraint on event NIDs.
+	// So we can allocate an array of the correct size now.
+	// We might get fewer results than NIDs so we adjust the length of the slice before returning it.
+	results := make([]eventJSONPair, len(eventNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		var eventNID int64
+		if err := rows.Scan(&eventNID, &result.EventJSON); err != nil {
+			return nil, err
+		}
+		result.EventNID = types.EventNID(eventNID)
+	}
+	return results[:i], nil
+}
diff --git a/roomserver/storage/sqlite3/event_state_keys_table.go b/roomserver/storage/sqlite3/event_state_keys_table.go
new file mode 100644
index 00000000..b8bc6c02
--- /dev/null
+++ b/roomserver/storage/sqlite3/event_state_keys_table.go
@@ -0,0 +1,156 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const eventStateKeysSchema = `
+	CREATE TABLE IF NOT EXISTS roomserver_event_state_keys (
+    event_state_key_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    event_state_key TEXT NOT NULL UNIQUE
+	);
+	INSERT INTO roomserver_event_state_keys (event_state_key_nid, event_state_key)
+		VALUES (1, '')
+		ON CONFLICT DO NOTHING;
+`
+
+// Same as insertEventTypeNIDSQL
+const insertEventStateKeyNIDSQL = `
+	INSERT INTO roomserver_event_state_keys (event_state_key) VALUES ($1)
+	  ON CONFLICT DO NOTHING;
+`
+
+const selectEventStateKeyNIDSQL = `
+	SELECT event_state_key_nid FROM roomserver_event_state_keys
+	  WHERE event_state_key = $1
+`
+
+// Bulk lookup from string state key to numeric ID for that state key.
+// Takes an array of strings as the query parameter.
+const bulkSelectEventStateKeyNIDSQL = `
+	SELECT event_state_key, event_state_key_nid FROM roomserver_event_state_keys
+	  WHERE event_state_key IN ($1)
+`
+
+// Bulk lookup from numeric ID to string state key for that state key.
+// Takes an array of strings as the query parameter.
+const bulkSelectEventStateKeySQL = `
+	SELECT event_state_key, event_state_key_nid FROM roomserver_event_state_keys
+	  WHERE event_state_key_nid IN ($1)
+`
+
+type eventStateKeyStatements struct {
+	db                             *sql.DB
+	insertEventStateKeyNIDStmt     *sql.Stmt
+	selectEventStateKeyNIDStmt     *sql.Stmt
+	bulkSelectEventStateKeyNIDStmt *sql.Stmt
+	bulkSelectEventStateKeyStmt    *sql.Stmt
+}
+
+func (s *eventStateKeyStatements) prepare(db *sql.DB) (err error) {
+	s.db = db
+	_, err = db.Exec(eventStateKeysSchema)
+	if err != nil {
+		return
+	}
+	return statementList{
+		{&s.insertEventStateKeyNIDStmt, insertEventStateKeyNIDSQL},
+		{&s.selectEventStateKeyNIDStmt, selectEventStateKeyNIDSQL},
+		{&s.bulkSelectEventStateKeyNIDStmt, bulkSelectEventStateKeyNIDSQL},
+		{&s.bulkSelectEventStateKeyStmt, bulkSelectEventStateKeySQL},
+	}.prepare(db)
+}
+
+func (s *eventStateKeyStatements) insertEventStateKeyNID(
+	ctx context.Context, txn *sql.Tx, eventStateKey string,
+) (types.EventStateKeyNID, error) {
+	var eventStateKeyNID int64
+	var err error
+	var res sql.Result
+	insertStmt := txn.Stmt(s.insertEventStateKeyNIDStmt)
+	if res, err = insertStmt.ExecContext(ctx, eventStateKey); err == nil {
+		eventStateKeyNID, err = res.LastInsertId()
+	}
+	return types.EventStateKeyNID(eventStateKeyNID), err
+}
+
+func (s *eventStateKeyStatements) selectEventStateKeyNID(
+	ctx context.Context, txn *sql.Tx, eventStateKey string,
+) (types.EventStateKeyNID, error) {
+	var eventStateKeyNID int64
+	stmt := txn.Stmt(s.selectEventStateKeyNIDStmt)
+	err := stmt.QueryRowContext(ctx, eventStateKey).Scan(&eventStateKeyNID)
+	return types.EventStateKeyNID(eventStateKeyNID), err
+}
+
+func (s *eventStateKeyStatements) bulkSelectEventStateKeyNID(
+	ctx context.Context, txn *sql.Tx, eventStateKeys []string,
+) (map[string]types.EventStateKeyNID, error) {
+	iEventStateKeys := make([]interface{}, len(eventStateKeys))
+	for k, v := range eventStateKeys {
+		iEventStateKeys[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventStateKeyNIDSQL, "($1)", common.QueryVariadic(len(eventStateKeys)), 1)
+
+	rows, err := txn.QueryContext(ctx, selectOrig, iEventStateKeys...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	result := make(map[string]types.EventStateKeyNID, len(eventStateKeys))
+	for rows.Next() {
+		var stateKey string
+		var stateKeyNID int64
+		if err := rows.Scan(&stateKey, &stateKeyNID); err != nil {
+			return nil, err
+		}
+		result[stateKey] = types.EventStateKeyNID(stateKeyNID)
+	}
+	return result, nil
+}
+
+func (s *eventStateKeyStatements) bulkSelectEventStateKey(
+	ctx context.Context, txn *sql.Tx, eventStateKeyNIDs []types.EventStateKeyNID,
+) (map[types.EventStateKeyNID]string, error) {
+	iEventStateKeyNIDs := make([]interface{}, len(eventStateKeyNIDs))
+	for k, v := range eventStateKeyNIDs {
+		iEventStateKeyNIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventStateKeyNIDSQL, "($1)", common.QueryVariadic(len(eventStateKeyNIDs)), 1)
+
+	rows, err := txn.QueryContext(ctx, selectOrig, iEventStateKeyNIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	result := make(map[types.EventStateKeyNID]string, len(eventStateKeyNIDs))
+	for rows.Next() {
+		var stateKey string
+		var stateKeyNID int64
+		if err := rows.Scan(&stateKey, &stateKeyNID); err != nil {
+			return nil, err
+		}
+		result[types.EventStateKeyNID(stateKeyNID)] = stateKey
+	}
+	return result, nil
+}
diff --git a/roomserver/storage/sqlite3/event_types_table.go b/roomserver/storage/sqlite3/event_types_table.go
new file mode 100644
index 00000000..edc06d4c
--- /dev/null
+++ b/roomserver/storage/sqlite3/event_types_table.go
@@ -0,0 +1,153 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const eventTypesSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_event_types (
+    event_type_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    event_type TEXT NOT NULL UNIQUE
+  );
+  INSERT INTO roomserver_event_types (event_type_nid, event_type) VALUES
+    (1, 'm.room.create'),
+    (2, 'm.room.power_levels'),
+    (3, 'm.room.join_rules'),
+    (4, 'm.room.third_party_invite'),
+    (5, 'm.room.member'),
+    (6, 'm.room.redaction'),
+    (7, 'm.room.history_visibility') ON CONFLICT DO NOTHING;
+`
+
+// Assign a new numeric event type ID.
+// The usual case is that the event type is not in the database.
+// In that case the ID will be assigned using the next value from the sequence.
+// We use `RETURNING` to tell postgres to return the assigned ID.
+// But it's possible that the type was added in a query that raced with us.
+// This will result in a conflict on the event_type_unique constraint, in this
+// case we do nothing. Postgresql won't return a row in that case so we rely on
+// the caller catching the sql.ErrNoRows error and running a select to get the row.
+// We could get postgresql to return the row on a conflict by updating the row
+// but it doesn't seem like a good idea to modify the rows just to make postgresql
+// return it. Modifying the rows will cause postgres to assign a new tuple for the
+// row even though the data doesn't change resulting in unncesssary modifications
+// to the indexes.
+const insertEventTypeNIDSQL = `
+	INSERT INTO roomserver_event_types (event_type) VALUES ($1)
+	  ON CONFLICT DO NOTHING;
+`
+
+const insertEventTypeNIDResultSQL = `
+	SELECT event_type_nid FROM roomserver_event_types
+		WHERE rowid = last_insert_rowid();
+`
+
+const selectEventTypeNIDSQL = `
+	SELECT event_type_nid FROM roomserver_event_types WHERE event_type = $1
+`
+
+// Bulk lookup from string event type to numeric ID for that event type.
+// Takes an array of strings as the query parameter.
+const bulkSelectEventTypeNIDSQL = `
+	SELECT event_type, event_type_nid FROM roomserver_event_types
+	  WHERE event_type IN ($1)
+`
+
+type eventTypeStatements struct {
+	db                           *sql.DB
+	insertEventTypeNIDStmt       *sql.Stmt
+	insertEventTypeNIDResultStmt *sql.Stmt
+	selectEventTypeNIDStmt       *sql.Stmt
+	bulkSelectEventTypeNIDStmt   *sql.Stmt
+}
+
+func (s *eventTypeStatements) prepare(db *sql.DB) (err error) {
+	s.db = db
+	_, err = db.Exec(eventTypesSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertEventTypeNIDStmt, insertEventTypeNIDSQL},
+		{&s.insertEventTypeNIDResultStmt, insertEventTypeNIDResultSQL},
+		{&s.selectEventTypeNIDStmt, selectEventTypeNIDSQL},
+		{&s.bulkSelectEventTypeNIDStmt, bulkSelectEventTypeNIDSQL},
+	}.prepare(db)
+}
+
+func (s *eventTypeStatements) insertEventTypeNID(
+	ctx context.Context, tx *sql.Tx, eventType string,
+) (types.EventTypeNID, error) {
+	var eventTypeNID int64
+	var err error
+	insertStmt := common.TxStmt(tx, s.insertEventTypeNIDStmt)
+	resultStmt := common.TxStmt(tx, s.insertEventTypeNIDResultStmt)
+	if _, err = insertStmt.ExecContext(ctx, eventType); err == nil {
+		err = resultStmt.QueryRowContext(ctx).Scan(&eventTypeNID)
+	}
+	return types.EventTypeNID(eventTypeNID), err
+}
+
+func (s *eventTypeStatements) selectEventTypeNID(
+	ctx context.Context, tx *sql.Tx, eventType string,
+) (types.EventTypeNID, error) {
+	var eventTypeNID int64
+	selectStmt := common.TxStmt(tx, s.selectEventTypeNIDStmt)
+	err := selectStmt.QueryRowContext(ctx, eventType).Scan(&eventTypeNID)
+	return types.EventTypeNID(eventTypeNID), err
+}
+
+func (s *eventTypeStatements) bulkSelectEventTypeNID(
+	ctx context.Context, tx *sql.Tx, eventTypes []string,
+) (map[string]types.EventTypeNID, error) {
+	///////////////
+	iEventTypes := make([]interface{}, len(eventTypes))
+	for k, v := range eventTypes {
+		iEventTypes[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventTypeNIDSQL, "($1)", common.QueryVariadic(len(iEventTypes)), 1)
+	selectPrep, err := s.db.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	selectStmt := common.TxStmt(tx, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, iEventTypes...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	result := make(map[string]types.EventTypeNID, len(eventTypes))
+	for rows.Next() {
+		var eventType string
+		var eventTypeNID int64
+		if err := rows.Scan(&eventType, &eventTypeNID); err != nil {
+			return nil, err
+		}
+		result[eventType] = types.EventTypeNID(eventTypeNID)
+	}
+	return result, nil
+}
diff --git a/roomserver/storage/sqlite3/events_table.go b/roomserver/storage/sqlite3/events_table.go
new file mode 100644
index 00000000..4ed1395d
--- /dev/null
+++ b/roomserver/storage/sqlite3/events_table.go
@@ -0,0 +1,479 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const eventsSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_events (
+    event_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    room_nid INTEGER NOT NULL,
+    event_type_nid INTEGER NOT NULL,
+    event_state_key_nid INTEGER NOT NULL,
+    sent_to_output BOOLEAN NOT NULL DEFAULT FALSE,
+    state_snapshot_nid INTEGER NOT NULL DEFAULT 0,
+    depth INTEGER NOT NULL,
+    event_id TEXT NOT NULL UNIQUE,
+    reference_sha256 BLOB NOT NULL,
+    auth_event_nids TEXT NOT NULL DEFAULT '{}'
+  );
+`
+
+const insertEventSQL = `
+	INSERT INTO roomserver_events (room_nid, event_type_nid, event_state_key_nid, event_id, reference_sha256, auth_event_nids, depth)
+	  VALUES ($1, $2, $3, $4, $5, $6, $7)
+	  ON CONFLICT DO NOTHING;
+`
+
+const insertEventResultSQL = `
+	SELECT event_nid, state_snapshot_nid FROM roomserver_events
+		WHERE rowid = last_insert_rowid();
+`
+
+const selectEventSQL = "" +
+	"SELECT event_nid, state_snapshot_nid FROM roomserver_events WHERE event_id = $1"
+
+// Bulk lookup of events by string ID.
+// Sort by the numeric IDs for event type and state key.
+// This means we can use binary search to lookup entries by type and state key.
+const bulkSelectStateEventByIDSQL = "" +
+	"SELECT event_type_nid, event_state_key_nid, event_nid FROM roomserver_events" +
+	" WHERE event_id IN ($1)" +
+	" ORDER BY event_type_nid, event_state_key_nid ASC"
+
+const bulkSelectStateAtEventByIDSQL = "" +
+	"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid FROM roomserver_events" +
+	" WHERE event_id IN ($1)"
+
+const updateEventStateSQL = "" +
+	"UPDATE roomserver_events SET state_snapshot_nid = $1 WHERE event_nid = $2"
+
+const selectEventSentToOutputSQL = "" +
+	"SELECT sent_to_output FROM roomserver_events WHERE event_nid = $1"
+
+const updateEventSentToOutputSQL = "" +
+	"UPDATE roomserver_events SET sent_to_output = TRUE WHERE event_nid = $1"
+
+const selectEventIDSQL = "" +
+	"SELECT event_id FROM roomserver_events WHERE event_nid = $1"
+
+const bulkSelectStateAtEventAndReferenceSQL = "" +
+	"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid, event_id, reference_sha256" +
+	" FROM roomserver_events WHERE event_nid IN ($1)"
+
+const bulkSelectEventReferenceSQL = "" +
+	"SELECT event_id, reference_sha256 FROM roomserver_events WHERE event_nid IN ($1)"
+
+const bulkSelectEventIDSQL = "" +
+	"SELECT event_nid, event_id FROM roomserver_events WHERE event_nid IN ($1)"
+
+const bulkSelectEventNIDSQL = "" +
+	"SELECT event_id, event_nid FROM roomserver_events WHERE event_id IN ($1)"
+
+const selectMaxEventDepthSQL = "" +
+	"SELECT COALESCE(MAX(depth) + 1, 0) FROM roomserver_events WHERE event_nid IN ($1)"
+
+type eventStatements struct {
+	db                                     *sql.DB
+	insertEventStmt                        *sql.Stmt
+	insertEventResultStmt                  *sql.Stmt
+	selectEventStmt                        *sql.Stmt
+	bulkSelectStateEventByIDStmt           *sql.Stmt
+	bulkSelectStateAtEventByIDStmt         *sql.Stmt
+	updateEventStateStmt                   *sql.Stmt
+	selectEventSentToOutputStmt            *sql.Stmt
+	updateEventSentToOutputStmt            *sql.Stmt
+	selectEventIDStmt                      *sql.Stmt
+	bulkSelectStateAtEventAndReferenceStmt *sql.Stmt
+	bulkSelectEventReferenceStmt           *sql.Stmt
+	bulkSelectEventIDStmt                  *sql.Stmt
+	bulkSelectEventNIDStmt                 *sql.Stmt
+	selectMaxEventDepthStmt                *sql.Stmt
+}
+
+func (s *eventStatements) prepare(db *sql.DB) (err error) {
+	s.db = db
+	_, err = db.Exec(eventsSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertEventStmt, insertEventSQL},
+		{&s.insertEventResultStmt, insertEventResultSQL},
+		{&s.selectEventStmt, selectEventSQL},
+		{&s.bulkSelectStateEventByIDStmt, bulkSelectStateEventByIDSQL},
+		{&s.bulkSelectStateAtEventByIDStmt, bulkSelectStateAtEventByIDSQL},
+		{&s.updateEventStateStmt, updateEventStateSQL},
+		{&s.updateEventSentToOutputStmt, updateEventSentToOutputSQL},
+		{&s.selectEventSentToOutputStmt, selectEventSentToOutputSQL},
+		{&s.selectEventIDStmt, selectEventIDSQL},
+		{&s.bulkSelectStateAtEventAndReferenceStmt, bulkSelectStateAtEventAndReferenceSQL},
+		{&s.bulkSelectEventReferenceStmt, bulkSelectEventReferenceSQL},
+		{&s.bulkSelectEventIDStmt, bulkSelectEventIDSQL},
+		{&s.bulkSelectEventNIDStmt, bulkSelectEventNIDSQL},
+		{&s.selectMaxEventDepthStmt, selectMaxEventDepthSQL},
+	}.prepare(db)
+}
+
+func (s *eventStatements) insertEvent(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomNID types.RoomNID,
+	eventTypeNID types.EventTypeNID,
+	eventStateKeyNID types.EventStateKeyNID,
+	eventID string,
+	referenceSHA256 []byte,
+	authEventNIDs []types.EventNID,
+	depth int64,
+) (types.EventNID, types.StateSnapshotNID, error) {
+	var eventNID int64
+	var stateNID int64
+	var err error
+	insertStmt := common.TxStmt(txn, s.insertEventStmt)
+	resultStmt := common.TxStmt(txn, s.insertEventResultStmt)
+	if _, err = insertStmt.ExecContext(
+		ctx, int64(roomNID), int64(eventTypeNID), int64(eventStateKeyNID),
+		eventID, referenceSHA256, eventNIDsAsArray(authEventNIDs), depth,
+	); err == nil {
+		err = resultStmt.QueryRowContext(ctx).Scan(&eventNID, &stateNID)
+	}
+	return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
+}
+
+func (s *eventStatements) selectEvent(
+	ctx context.Context, txn *sql.Tx, eventID string,
+) (types.EventNID, types.StateSnapshotNID, error) {
+	var eventNID int64
+	var stateNID int64
+	selectStmt := common.TxStmt(txn, s.selectEventStmt)
+	err := selectStmt.QueryRowContext(ctx, eventID).Scan(&eventNID, &stateNID)
+	return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
+}
+
+// bulkSelectStateEventByID lookups a list of state events by event ID.
+// If any of the requested events are missing from the database it returns a types.MissingEventError
+func (s *eventStatements) bulkSelectStateEventByID(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]types.StateEntry, error) {
+	///////////////
+	iEventIDs := make([]interface{}, len(eventIDs))
+	for k, v := range eventIDs {
+		iEventIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectStateEventByIDSQL, "($1)", common.QueryVariadic(len(iEventIDs)), 1)
+	selectPrep, err := txn.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	selectStmt := common.TxStmt(txn, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, iEventIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	// We know that we will only get as many results as event IDs
+	// because of the unique constraint on event IDs.
+	// So we can allocate an array of the correct size now.
+	// We might get fewer results than IDs so we adjust the length of the slice before returning it.
+	results := make([]types.StateEntry, len(eventIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		if err = rows.Scan(
+			&result.EventTypeNID,
+			&result.EventStateKeyNID,
+			&result.EventNID,
+		); err != nil {
+			return nil, err
+		}
+	}
+	if i != len(eventIDs) {
+		// If there are fewer rows returned than IDs then we were asked to lookup event IDs we don't have.
+		// We don't know which ones were missing because we don't return the string IDs in the query.
+		// However it should be possible debug this by replaying queries or entries from the input kafka logs.
+		// If this turns out to be impossible and we do need the debug information here, it would be better
+		// to do it as a separate query rather than slowing down/complicating the common case.
+		return nil, types.MissingEventError(
+			fmt.Sprintf("storage: state event IDs missing from the database (%d != %d)", i, len(eventIDs)),
+		)
+	}
+	return results, err
+}
+
+// bulkSelectStateAtEventByID lookups the state at a list of events by event ID.
+// If any of the requested events are missing from the database it returns a types.MissingEventError.
+// If we do not have the state for any of the requested events it returns a types.MissingEventError.
+func (s *eventStatements) bulkSelectStateAtEventByID(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]types.StateAtEvent, error) {
+	///////////////
+	iEventIDs := make([]interface{}, len(eventIDs))
+	for k, v := range eventIDs {
+		iEventIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectStateAtEventByIDSQL, "($1)", common.QueryVariadic(len(iEventIDs)), 1)
+	selectPrep, err := txn.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	selectStmt := common.TxStmt(txn, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, iEventIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := make([]types.StateAtEvent, len(eventIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		if err = rows.Scan(
+			&result.EventTypeNID,
+			&result.EventStateKeyNID,
+			&result.EventNID,
+			&result.BeforeStateSnapshotNID,
+		); err != nil {
+			return nil, err
+		}
+		if result.BeforeStateSnapshotNID == 0 {
+			return nil, types.MissingEventError(
+				fmt.Sprintf("storage: missing state for event NID %d", result.EventNID),
+			)
+		}
+	}
+	if i != len(eventIDs) {
+		return nil, types.MissingEventError(
+			fmt.Sprintf("storage: event IDs missing from the database (%d != %d)", i, len(eventIDs)),
+		)
+	}
+	return results, err
+}
+
+func (s *eventStatements) updateEventState(
+	ctx context.Context, txn *sql.Tx, eventNID types.EventNID, stateNID types.StateSnapshotNID,
+) error {
+	updateStmt := common.TxStmt(txn, s.updateEventStateStmt)
+	_, err := updateStmt.ExecContext(ctx, int64(stateNID), int64(eventNID))
+	return err
+}
+
+func (s *eventStatements) selectEventSentToOutput(
+	ctx context.Context, txn *sql.Tx, eventNID types.EventNID,
+) (sentToOutput bool, err error) {
+	selectStmt := common.TxStmt(txn, s.selectEventSentToOutputStmt)
+	err = selectStmt.QueryRowContext(ctx, int64(eventNID)).Scan(&sentToOutput)
+	//err = s.selectEventSentToOutputStmt.QueryRowContext(ctx, int64(eventNID)).Scan(&sentToOutput)
+	if err != nil {
+	}
+	return
+}
+
+func (s *eventStatements) updateEventSentToOutput(ctx context.Context, txn *sql.Tx, eventNID types.EventNID) error {
+	updateStmt := common.TxStmt(txn, s.updateEventSentToOutputStmt)
+	_, err := updateStmt.ExecContext(ctx, int64(eventNID))
+	//_, err := s.updateEventSentToOutputStmt.ExecContext(ctx, int64(eventNID))
+	return err
+}
+
+func (s *eventStatements) selectEventID(
+	ctx context.Context, txn *sql.Tx, eventNID types.EventNID,
+) (eventID string, err error) {
+	selectStmt := common.TxStmt(txn, s.selectEventIDStmt)
+	err = selectStmt.QueryRowContext(ctx, int64(eventNID)).Scan(&eventID)
+	return
+}
+
+func (s *eventStatements) bulkSelectStateAtEventAndReference(
+	ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
+) ([]types.StateAtEventAndReference, error) {
+	///////////////
+	iEventNIDs := make([]interface{}, len(eventNIDs))
+	for k, v := range eventNIDs {
+		iEventNIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectStateAtEventAndReferenceSQL, "($1)", common.QueryVariadic(len(iEventNIDs)), 1)
+	//////////////
+
+	rows, err := txn.QueryContext(ctx, selectOrig, iEventNIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := make([]types.StateAtEventAndReference, len(eventNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		var (
+			eventTypeNID     int64
+			eventStateKeyNID int64
+			eventNID         int64
+			stateSnapshotNID int64
+			eventID          string
+			eventSHA256      []byte
+		)
+		if err = rows.Scan(
+			&eventTypeNID, &eventStateKeyNID, &eventNID, &stateSnapshotNID, &eventID, &eventSHA256,
+		); err != nil {
+			return nil, err
+		}
+		result := &results[i]
+		result.EventTypeNID = types.EventTypeNID(eventTypeNID)
+		result.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
+		result.EventNID = types.EventNID(eventNID)
+		result.BeforeStateSnapshotNID = types.StateSnapshotNID(stateSnapshotNID)
+		result.EventID = eventID
+		result.EventSHA256 = eventSHA256
+	}
+	if i != len(eventNIDs) {
+		return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
+	}
+	return results, nil
+}
+
+func (s *eventStatements) bulkSelectEventReference(
+	ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
+) ([]gomatrixserverlib.EventReference, error) {
+	///////////////
+	iEventNIDs := make([]interface{}, len(eventNIDs))
+	for k, v := range eventNIDs {
+		iEventNIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventReferenceSQL, "($1)", common.QueryVariadic(len(iEventNIDs)), 1)
+	selectPrep, err := txn.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	selectStmt := common.TxStmt(txn, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, iEventNIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := make([]gomatrixserverlib.EventReference, len(eventNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		if err = rows.Scan(&result.EventID, &result.EventSHA256); err != nil {
+			return nil, err
+		}
+	}
+	if i != len(eventNIDs) {
+		return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
+	}
+	return results, nil
+}
+
+// bulkSelectEventID returns a map from numeric event ID to string event ID.
+func (s *eventStatements) bulkSelectEventID(ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID) (map[types.EventNID]string, error) {
+	///////////////
+	iEventNIDs := make([]interface{}, len(eventNIDs))
+	for k, v := range eventNIDs {
+		iEventNIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventIDSQL, "($1)", common.QueryVariadic(len(iEventNIDs)), 1)
+	selectPrep, err := txn.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	selectStmt := common.TxStmt(txn, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, iEventNIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := make(map[types.EventNID]string, len(eventNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		var eventNID int64
+		var eventID string
+		if err = rows.Scan(&eventNID, &eventID); err != nil {
+			return nil, err
+		}
+		results[types.EventNID(eventNID)] = eventID
+	}
+	if i != len(eventNIDs) {
+		return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
+	}
+	return results, nil
+}
+
+// bulkSelectEventNIDs returns a map from string event ID to numeric event ID.
+// If an event ID is not in the database then it is omitted from the map.
+func (s *eventStatements) bulkSelectEventNID(ctx context.Context, txn *sql.Tx, eventIDs []string) (map[string]types.EventNID, error) {
+	///////////////
+	iEventIDs := make([]interface{}, len(eventIDs))
+	for k, v := range eventIDs {
+		iEventIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectEventNIDSQL, "($1)", common.QueryVariadic(len(iEventIDs)), 1)
+	selectPrep, err := txn.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	selectStmt := common.TxStmt(txn, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, iEventIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := make(map[string]types.EventNID, len(eventIDs))
+	for rows.Next() {
+		var eventID string
+		var eventNID int64
+		if err = rows.Scan(&eventID, &eventNID); err != nil {
+			return nil, err
+		}
+		results[eventID] = types.EventNID(eventNID)
+	}
+	return results, nil
+}
+
+func (s *eventStatements) selectMaxEventDepth(ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID) (int64, error) {
+	var result int64
+	selectStmt := common.TxStmt(txn, s.selectMaxEventDepthStmt)
+	err := selectStmt.QueryRowContext(ctx, sqliteIn(eventNIDsAsArray(eventNIDs))).Scan(&result)
+	if err != nil {
+		return 0, err
+	}
+	return result, nil
+}
+
+func eventNIDsAsArray(eventNIDs []types.EventNID) pq.Int64Array {
+	nids := make([]int64, len(eventNIDs))
+	for i := range eventNIDs {
+		nids[i] = int64(eventNIDs[i])
+	}
+	return nids
+}
diff --git a/roomserver/storage/sqlite3/invite_table.go b/roomserver/storage/sqlite3/invite_table.go
new file mode 100644
index 00000000..5a0f0bf7
--- /dev/null
+++ b/roomserver/storage/sqlite3/invite_table.go
@@ -0,0 +1,142 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const inviteSchema = `
+	CREATE TABLE IF NOT EXISTS roomserver_invites (
+		invite_event_id TEXT PRIMARY KEY,
+		room_nid INTEGER NOT NULL,
+		target_nid INTEGER NOT NULL,
+		sender_nid INTEGER NOT NULL DEFAULT 0,
+		retired BOOLEAN NOT NULL DEFAULT FALSE,
+		invite_event_json TEXT NOT NULL
+	);
+
+	CREATE INDEX IF NOT EXISTS roomserver_invites_active_idx ON roomserver_invites (target_nid, room_nid)
+		WHERE NOT retired;
+`
+const insertInviteEventSQL = "" +
+	"INSERT INTO roomserver_invites (invite_event_id, room_nid, target_nid," +
+	" sender_nid, invite_event_json) VALUES ($1, $2, $3, $4, $5)" +
+	" ON CONFLICT DO NOTHING"
+
+const selectInviteActiveForUserInRoomSQL = "" +
+	"SELECT sender_nid FROM roomserver_invites" +
+	" WHERE target_nid = $1 AND room_nid = $2" +
+	" AND NOT retired"
+
+// Retire every active invite for a user in a room.
+// Ideally we'd know which invite events were retired by a given update so we
+// wouldn't need to remove every active invite.
+// However the matrix protocol doesn't give us a way to reliably identify the
+// invites that were retired, so we are forced to retire all of them.
+const updateInviteRetiredSQL = `
+	UPDATE roomserver_invites SET retired = TRUE
+	  WHERE room_nid = $1 AND target_nid = $2 AND NOT retired;
+	SELECT invite_event_id FROM roomserver_invites
+		WHERE rowid = last_insert_rowid();
+`
+
+type inviteStatements struct {
+	insertInviteEventStmt               *sql.Stmt
+	selectInviteActiveForUserInRoomStmt *sql.Stmt
+	updateInviteRetiredStmt             *sql.Stmt
+}
+
+func (s *inviteStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(inviteSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertInviteEventStmt, insertInviteEventSQL},
+		{&s.selectInviteActiveForUserInRoomStmt, selectInviteActiveForUserInRoomSQL},
+		{&s.updateInviteRetiredStmt, updateInviteRetiredSQL},
+	}.prepare(db)
+}
+
+func (s *inviteStatements) insertInviteEvent(
+	ctx context.Context,
+	txn *sql.Tx, inviteEventID string, roomNID types.RoomNID,
+	targetUserNID, senderUserNID types.EventStateKeyNID,
+	inviteEventJSON []byte,
+) (bool, error) {
+	stmt := common.TxStmt(txn, s.insertInviteEventStmt)
+	defer stmt.Close() // nolint: errcheck
+	result, err := stmt.ExecContext(
+		ctx, inviteEventID, roomNID, targetUserNID, senderUserNID, inviteEventJSON,
+	)
+	if err != nil {
+		return false, err
+	}
+	count, err := result.RowsAffected()
+	if err != nil {
+		return false, err
+	}
+	return count != 0, nil
+}
+
+func (s *inviteStatements) updateInviteRetired(
+	ctx context.Context,
+	txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
+) (eventIDs []string, err error) {
+	stmt := common.TxStmt(txn, s.updateInviteRetiredStmt)
+	rows, err := stmt.QueryContext(ctx, roomNID, targetUserNID)
+	if err != nil {
+		return nil, err
+	}
+	defer (func() { err = rows.Close() })()
+	for rows.Next() {
+		var inviteEventID string
+		if err := rows.Scan(&inviteEventID); err != nil {
+			return nil, err
+		}
+		eventIDs = append(eventIDs, inviteEventID)
+	}
+	return
+}
+
+// selectInviteActiveForUserInRoom returns a list of sender state key NIDs
+func (s *inviteStatements) selectInviteActiveForUserInRoom(
+	ctx context.Context,
+	targetUserNID types.EventStateKeyNID, roomNID types.RoomNID,
+) ([]types.EventStateKeyNID, error) {
+	rows, err := s.selectInviteActiveForUserInRoomStmt.QueryContext(
+		ctx, targetUserNID, roomNID,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	var result []types.EventStateKeyNID
+	for rows.Next() {
+		var senderUserNID int64
+		if err := rows.Scan(&senderUserNID); err != nil {
+			return nil, err
+		}
+		result = append(result, types.EventStateKeyNID(senderUserNID))
+	}
+	return result, nil
+}
diff --git a/roomserver/storage/sqlite3/list.go b/roomserver/storage/sqlite3/list.go
new file mode 100644
index 00000000..4fe4e334
--- /dev/null
+++ b/roomserver/storage/sqlite3/list.go
@@ -0,0 +1,18 @@
+package sqlite3
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/lib/pq"
+)
+
+type SqliteList string
+
+func sqliteIn(a pq.Int64Array) string {
+	var b []string
+	for _, n := range a {
+		b = append(b, strconv.FormatInt(n, 10))
+	}
+	return strings.Join(b, ",")
+}
diff --git a/roomserver/storage/sqlite3/membership_table.go b/roomserver/storage/sqlite3/membership_table.go
new file mode 100644
index 00000000..97877673
--- /dev/null
+++ b/roomserver/storage/sqlite3/membership_table.go
@@ -0,0 +1,180 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+type membershipState int64
+
+const (
+	membershipStateLeaveOrBan membershipState = 1
+	membershipStateInvite     membershipState = 2
+	membershipStateJoin       membershipState = 3
+)
+
+const membershipSchema = `
+	CREATE TABLE IF NOT EXISTS roomserver_membership (
+		room_nid INTEGER NOT NULL,
+		target_nid INTEGER NOT NULL,
+		sender_nid INTEGER NOT NULL DEFAULT 0,
+		membership_nid INTEGER NOT NULL DEFAULT 1,
+		event_nid INTEGER NOT NULL DEFAULT 0,
+		UNIQUE (room_nid, target_nid)
+	);
+`
+
+// Insert a row in to membership table so that it can be locked by the
+// SELECT FOR UPDATE
+const insertMembershipSQL = "" +
+	"INSERT INTO roomserver_membership (room_nid, target_nid)" +
+	" VALUES ($1, $2)" +
+	" ON CONFLICT DO NOTHING"
+
+const selectMembershipFromRoomAndTargetSQL = "" +
+	"SELECT membership_nid, event_nid FROM roomserver_membership" +
+	" WHERE room_nid = $1 AND target_nid = $2"
+
+const selectMembershipsFromRoomAndMembershipSQL = "" +
+	"SELECT event_nid FROM roomserver_membership" +
+	" WHERE room_nid = $1 AND membership_nid = $2"
+
+const selectMembershipsFromRoomSQL = "" +
+	"SELECT event_nid FROM roomserver_membership" +
+	" WHERE room_nid = $1"
+
+const selectMembershipForUpdateSQL = "" +
+	"SELECT membership_nid FROM roomserver_membership" +
+	" WHERE room_nid = $1 AND target_nid = $2"
+
+const updateMembershipSQL = "" +
+	"UPDATE roomserver_membership SET sender_nid = $1, membership_nid = $2, event_nid = $3" +
+	" WHERE room_nid = $4 AND target_nid = $5"
+
+type membershipStatements struct {
+	insertMembershipStmt                       *sql.Stmt
+	selectMembershipForUpdateStmt              *sql.Stmt
+	selectMembershipFromRoomAndTargetStmt      *sql.Stmt
+	selectMembershipsFromRoomAndMembershipStmt *sql.Stmt
+	selectMembershipsFromRoomStmt              *sql.Stmt
+	updateMembershipStmt                       *sql.Stmt
+}
+
+func (s *membershipStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(membershipSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertMembershipStmt, insertMembershipSQL},
+		{&s.selectMembershipForUpdateStmt, selectMembershipForUpdateSQL},
+		{&s.selectMembershipFromRoomAndTargetStmt, selectMembershipFromRoomAndTargetSQL},
+		{&s.selectMembershipsFromRoomAndMembershipStmt, selectMembershipsFromRoomAndMembershipSQL},
+		{&s.selectMembershipsFromRoomStmt, selectMembershipsFromRoomSQL},
+		{&s.updateMembershipStmt, updateMembershipSQL},
+	}.prepare(db)
+}
+
+func (s *membershipStatements) insertMembership(
+	ctx context.Context, txn *sql.Tx,
+	roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
+) error {
+	stmt := common.TxStmt(txn, s.insertMembershipStmt)
+	_, err := stmt.ExecContext(ctx, roomNID, targetUserNID)
+	return err
+}
+
+func (s *membershipStatements) selectMembershipForUpdate(
+	ctx context.Context, txn *sql.Tx,
+	roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
+) (membership membershipState, err error) {
+	stmt := common.TxStmt(txn, s.selectMembershipForUpdateStmt)
+	err = stmt.QueryRowContext(
+		ctx, roomNID, targetUserNID,
+	).Scan(&membership)
+	return
+}
+
+func (s *membershipStatements) selectMembershipFromRoomAndTarget(
+	ctx context.Context, txn *sql.Tx,
+	roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
+) (eventNID types.EventNID, membership membershipState, err error) {
+	selectStmt := common.TxStmt(txn, s.selectMembershipFromRoomAndTargetStmt)
+	err = selectStmt.QueryRowContext(
+		ctx, roomNID, targetUserNID,
+	).Scan(&membership, &eventNID)
+	return
+}
+
+func (s *membershipStatements) selectMembershipsFromRoom(
+	ctx context.Context, txn *sql.Tx,
+	roomNID types.RoomNID,
+) (eventNIDs []types.EventNID, err error) {
+	selectStmt := common.TxStmt(txn, s.selectMembershipsFromRoomStmt)
+	rows, err := selectStmt.QueryContext(ctx, roomNID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	for rows.Next() {
+		var eNID types.EventNID
+		if err = rows.Scan(&eNID); err != nil {
+			return
+		}
+		eventNIDs = append(eventNIDs, eNID)
+	}
+	return
+}
+func (s *membershipStatements) selectMembershipsFromRoomAndMembership(
+	ctx context.Context, txn *sql.Tx,
+	roomNID types.RoomNID, membership membershipState,
+) (eventNIDs []types.EventNID, err error) {
+	stmt := common.TxStmt(txn, s.selectMembershipsFromRoomAndMembershipStmt)
+	rows, err := stmt.QueryContext(ctx, roomNID, membership)
+	if err != nil {
+		return
+	}
+	defer rows.Close() // nolint: errcheck
+
+	for rows.Next() {
+		var eNID types.EventNID
+		if err = rows.Scan(&eNID); err != nil {
+			return
+		}
+		eventNIDs = append(eventNIDs, eNID)
+	}
+	return
+}
+
+func (s *membershipStatements) updateMembership(
+	ctx context.Context, txn *sql.Tx,
+	roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
+	senderUserNID types.EventStateKeyNID, membership membershipState,
+	eventNID types.EventNID,
+) error {
+	stmt := common.TxStmt(txn, s.updateMembershipStmt)
+	_, err := stmt.ExecContext(
+		ctx, senderUserNID, membership, eventNID, roomNID, targetUserNID,
+	)
+	return err
+}
diff --git a/roomserver/storage/sqlite3/prepare.go b/roomserver/storage/sqlite3/prepare.go
new file mode 100644
index 00000000..482dfa2b
--- /dev/null
+++ b/roomserver/storage/sqlite3/prepare.go
@@ -0,0 +1,36 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"database/sql"
+)
+
+// a statementList is a list of SQL statements to prepare and a pointer to where to store the resulting prepared statement.
+type statementList []struct {
+	statement **sql.Stmt
+	sql       string
+}
+
+// prepare the SQL for each statement in the list and assign the result to the prepared statement.
+func (s statementList) prepare(db *sql.DB) (err error) {
+	for _, statement := range s {
+		if *statement.statement, err = db.Prepare(statement.sql); err != nil {
+			return
+		}
+	}
+	return
+}
diff --git a/roomserver/storage/sqlite3/previous_events_table.go b/roomserver/storage/sqlite3/previous_events_table.go
new file mode 100644
index 00000000..9ed64a38
--- /dev/null
+++ b/roomserver/storage/sqlite3/previous_events_table.go
@@ -0,0 +1,92 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const previousEventSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_previous_events (
+    previous_event_id TEXT NOT NULL,
+    previous_reference_sha256 BLOB NOT NULL,
+    event_nids TEXT NOT NULL,
+    UNIQUE (previous_event_id, previous_reference_sha256)
+  );
+`
+
+// Insert an entry into the previous_events table.
+// If there is already an entry indicating that an event references that previous event then
+// add the event NID to the list to indicate that this event references that previous event as well.
+// This should only be modified while holding a "FOR UPDATE" lock on the row in the rooms table for this room.
+// The lock is necessary to avoid data races when checking whether an event is already referenced by another event.
+const insertPreviousEventSQL = `
+	INSERT OR REPLACE INTO roomserver_previous_events
+	  (previous_event_id, previous_reference_sha256, event_nids)
+	  VALUES ($1, $2, $3)
+`
+
+// Check if the event is referenced by another event in the table.
+// This should only be done while holding a "FOR UPDATE" lock on the row in the rooms table for this room.
+const selectPreviousEventExistsSQL = `
+	SELECT 1 FROM roomserver_previous_events
+	  WHERE previous_event_id = $1 AND previous_reference_sha256 = $2
+`
+
+type previousEventStatements struct {
+	insertPreviousEventStmt       *sql.Stmt
+	selectPreviousEventExistsStmt *sql.Stmt
+}
+
+func (s *previousEventStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(previousEventSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertPreviousEventStmt, insertPreviousEventSQL},
+		{&s.selectPreviousEventExistsStmt, selectPreviousEventExistsSQL},
+	}.prepare(db)
+}
+
+func (s *previousEventStatements) insertPreviousEvent(
+	ctx context.Context,
+	txn *sql.Tx,
+	previousEventID string,
+	previousEventReferenceSHA256 []byte,
+	eventNID types.EventNID,
+) error {
+	stmt := common.TxStmt(txn, s.insertPreviousEventStmt)
+	_, err := stmt.ExecContext(
+		ctx, previousEventID, previousEventReferenceSHA256, int64(eventNID),
+	)
+	return err
+}
+
+// Check if the event reference exists
+// Returns sql.ErrNoRows if the event reference doesn't exist.
+func (s *previousEventStatements) selectPreviousEventExists(
+	ctx context.Context, txn *sql.Tx, eventID string, eventReferenceSHA256 []byte,
+) error {
+	var ok int64
+	stmt := common.TxStmt(txn, s.selectPreviousEventExistsStmt)
+	return stmt.QueryRowContext(ctx, eventID, eventReferenceSHA256).Scan(&ok)
+}
diff --git a/roomserver/storage/sqlite3/room_aliases_table.go b/roomserver/storage/sqlite3/room_aliases_table.go
new file mode 100644
index 00000000..a5fd5449
--- /dev/null
+++ b/roomserver/storage/sqlite3/room_aliases_table.go
@@ -0,0 +1,135 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+)
+
+const roomAliasesSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_room_aliases (
+    alias TEXT NOT NULL PRIMARY KEY,
+    room_id TEXT NOT NULL,
+    creator_id TEXT NOT NULL
+  );
+
+  CREATE INDEX IF NOT EXISTS roomserver_room_id_idx ON roomserver_room_aliases(room_id);
+`
+
+const insertRoomAliasSQL = `
+	INSERT INTO roomserver_room_aliases (alias, room_id, creator_id) VALUES ($1, $2, $3)
+`
+
+const selectRoomIDFromAliasSQL = `
+	SELECT room_id FROM roomserver_room_aliases WHERE alias = $1
+`
+
+const selectAliasesFromRoomIDSQL = `
+	SELECT alias FROM roomserver_room_aliases WHERE room_id = $1
+`
+
+const selectCreatorIDFromAliasSQL = `
+	SELECT creator_id FROM roomserver_room_aliases WHERE alias = $1
+`
+
+const deleteRoomAliasSQL = `
+	DELETE FROM roomserver_room_aliases WHERE alias = $1
+`
+
+type roomAliasesStatements struct {
+	insertRoomAliasStmt          *sql.Stmt
+	selectRoomIDFromAliasStmt    *sql.Stmt
+	selectAliasesFromRoomIDStmt  *sql.Stmt
+	selectCreatorIDFromAliasStmt *sql.Stmt
+	deleteRoomAliasStmt          *sql.Stmt
+}
+
+func (s *roomAliasesStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(roomAliasesSchema)
+	if err != nil {
+		return
+	}
+	return statementList{
+		{&s.insertRoomAliasStmt, insertRoomAliasSQL},
+		{&s.selectRoomIDFromAliasStmt, selectRoomIDFromAliasSQL},
+		{&s.selectAliasesFromRoomIDStmt, selectAliasesFromRoomIDSQL},
+		{&s.selectCreatorIDFromAliasStmt, selectCreatorIDFromAliasSQL},
+		{&s.deleteRoomAliasStmt, deleteRoomAliasSQL},
+	}.prepare(db)
+}
+
+func (s *roomAliasesStatements) insertRoomAlias(
+	ctx context.Context, txn *sql.Tx, alias string, roomID string, creatorUserID string,
+) (err error) {
+	insertStmt := common.TxStmt(txn, s.insertRoomAliasStmt)
+	_, err = insertStmt.ExecContext(ctx, alias, roomID, creatorUserID)
+	return
+}
+
+func (s *roomAliasesStatements) selectRoomIDFromAlias(
+	ctx context.Context, txn *sql.Tx, alias string,
+) (roomID string, err error) {
+	selectStmt := common.TxStmt(txn, s.selectRoomIDFromAliasStmt)
+	err = selectStmt.QueryRowContext(ctx, alias).Scan(&roomID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return
+}
+
+func (s *roomAliasesStatements) selectAliasesFromRoomID(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (aliases []string, err error) {
+	aliases = []string{}
+	selectStmt := common.TxStmt(txn, s.selectAliasesFromRoomIDStmt)
+	rows, err := selectStmt.QueryContext(ctx, roomID)
+	if err != nil {
+		return
+	}
+
+	for rows.Next() {
+		var alias string
+		if err = rows.Scan(&alias); err != nil {
+			return
+		}
+
+		aliases = append(aliases, alias)
+	}
+
+	return
+}
+
+func (s *roomAliasesStatements) selectCreatorIDFromAlias(
+	ctx context.Context, txn *sql.Tx, alias string,
+) (creatorID string, err error) {
+	selectStmt := common.TxStmt(txn, s.selectCreatorIDFromAliasStmt)
+	err = selectStmt.QueryRowContext(ctx, alias).Scan(&creatorID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return
+}
+
+func (s *roomAliasesStatements) deleteRoomAlias(
+	ctx context.Context, txn *sql.Tx, alias string,
+) (err error) {
+	deleteStmt := common.TxStmt(txn, s.deleteRoomAliasStmt)
+	_, err = deleteStmt.ExecContext(ctx, alias)
+	return
+}
diff --git a/roomserver/storage/sqlite3/rooms_table.go b/roomserver/storage/sqlite3/rooms_table.go
new file mode 100644
index 00000000..bf237728
--- /dev/null
+++ b/roomserver/storage/sqlite3/rooms_table.go
@@ -0,0 +1,165 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const roomsSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_rooms (
+    room_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    room_id TEXT NOT NULL UNIQUE,
+    latest_event_nids TEXT NOT NULL DEFAULT '{}',
+    last_event_sent_nid INTEGER NOT NULL DEFAULT 0,
+    state_snapshot_nid INTEGER NOT NULL DEFAULT 0,
+    room_version INTEGER NOT NULL DEFAULT 1
+  );
+`
+
+// Same as insertEventTypeNIDSQL
+const insertRoomNIDSQL = `
+	INSERT INTO roomserver_rooms (room_id) VALUES ($1)
+	  ON CONFLICT DO NOTHING;
+`
+
+const selectRoomNIDSQL = "" +
+	"SELECT room_nid FROM roomserver_rooms WHERE room_id = $1"
+
+const selectLatestEventNIDsSQL = "" +
+	"SELECT latest_event_nids, state_snapshot_nid FROM roomserver_rooms WHERE room_nid = $1"
+
+const selectLatestEventNIDsForUpdateSQL = "" +
+	"SELECT latest_event_nids, last_event_sent_nid, state_snapshot_nid FROM roomserver_rooms WHERE room_nid = $1"
+
+const updateLatestEventNIDsSQL = "" +
+	"UPDATE roomserver_rooms SET latest_event_nids = $1, last_event_sent_nid = $2, state_snapshot_nid = $3 WHERE room_nid = $4"
+
+const selectRoomVersionForRoomNIDSQL = "" +
+	"SELECT room_version FROM roomserver_rooms WHERE room_nid = $1"
+
+type roomStatements struct {
+	insertRoomNIDStmt                  *sql.Stmt
+	selectRoomNIDStmt                  *sql.Stmt
+	selectLatestEventNIDsStmt          *sql.Stmt
+	selectLatestEventNIDsForUpdateStmt *sql.Stmt
+	updateLatestEventNIDsStmt          *sql.Stmt
+	selectRoomVersionForRoomNIDStmt    *sql.Stmt
+}
+
+func (s *roomStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(roomsSchema)
+	if err != nil {
+		return
+	}
+	return statementList{
+		{&s.insertRoomNIDStmt, insertRoomNIDSQL},
+		{&s.selectRoomNIDStmt, selectRoomNIDSQL},
+		{&s.selectLatestEventNIDsStmt, selectLatestEventNIDsSQL},
+		{&s.selectLatestEventNIDsForUpdateStmt, selectLatestEventNIDsForUpdateSQL},
+		{&s.updateLatestEventNIDsStmt, updateLatestEventNIDsSQL},
+		{&s.selectRoomVersionForRoomNIDStmt, selectRoomVersionForRoomNIDSQL},
+	}.prepare(db)
+}
+
+func (s *roomStatements) insertRoomNID(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (types.RoomNID, error) {
+	var err error
+	insertStmt := common.TxStmt(txn, s.insertRoomNIDStmt)
+	if _, err = insertStmt.ExecContext(ctx, roomID); err == nil {
+		return s.selectRoomNID(ctx, txn, roomID)
+	} else {
+		return types.RoomNID(0), err
+	}
+}
+
+func (s *roomStatements) selectRoomNID(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (types.RoomNID, error) {
+	var roomNID int64
+	stmt := common.TxStmt(txn, s.selectRoomNIDStmt)
+	err := stmt.QueryRowContext(ctx, roomID).Scan(&roomNID)
+	return types.RoomNID(roomNID), err
+}
+
+func (s *roomStatements) selectLatestEventNIDs(
+	ctx context.Context, txn *sql.Tx, roomNID types.RoomNID,
+) ([]types.EventNID, types.StateSnapshotNID, error) {
+	var nids pq.Int64Array
+	var stateSnapshotNID int64
+	stmt := common.TxStmt(txn, s.selectLatestEventNIDsStmt)
+	err := stmt.QueryRowContext(ctx, int64(roomNID)).Scan(&nids, &stateSnapshotNID)
+	if err != nil {
+		return nil, 0, err
+	}
+	eventNIDs := make([]types.EventNID, len(nids))
+	for i := range nids {
+		eventNIDs[i] = types.EventNID(nids[i])
+	}
+	return eventNIDs, types.StateSnapshotNID(stateSnapshotNID), nil
+}
+
+func (s *roomStatements) selectLatestEventsNIDsForUpdate(
+	ctx context.Context, txn *sql.Tx, roomNID types.RoomNID,
+) ([]types.EventNID, types.EventNID, types.StateSnapshotNID, error) {
+	var nids pq.Int64Array
+	var lastEventSentNID int64
+	var stateSnapshotNID int64
+	stmt := common.TxStmt(txn, s.selectLatestEventNIDsForUpdateStmt)
+	err := stmt.QueryRowContext(ctx, int64(roomNID)).Scan(&nids, &lastEventSentNID, &stateSnapshotNID)
+	if err != nil {
+		return nil, 0, 0, err
+	}
+	eventNIDs := make([]types.EventNID, len(nids))
+	for i := range nids {
+		eventNIDs[i] = types.EventNID(nids[i])
+	}
+	return eventNIDs, types.EventNID(lastEventSentNID), types.StateSnapshotNID(stateSnapshotNID), nil
+}
+
+func (s *roomStatements) updateLatestEventNIDs(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomNID types.RoomNID,
+	eventNIDs []types.EventNID,
+	lastEventSentNID types.EventNID,
+	stateSnapshotNID types.StateSnapshotNID,
+) error {
+	stmt := common.TxStmt(txn, s.updateLatestEventNIDsStmt)
+	_, err := stmt.ExecContext(
+		ctx,
+		eventNIDsAsArray(eventNIDs),
+		int64(lastEventSentNID),
+		int64(stateSnapshotNID),
+		roomNID,
+	)
+	return err
+}
+
+func (s *roomStatements) selectRoomVersionForRoomNID(
+	ctx context.Context, txn *sql.Tx, roomNID types.RoomNID,
+) (int64, error) {
+	var roomVersion int64
+	stmt := common.TxStmt(txn, s.selectRoomVersionForRoomNIDStmt)
+	err := stmt.QueryRowContext(ctx, roomNID).Scan(&roomVersion)
+	return roomVersion, err
+}
diff --git a/roomserver/storage/sqlite3/sql.go b/roomserver/storage/sqlite3/sql.go
new file mode 100644
index 00000000..0d49432b
--- /dev/null
+++ b/roomserver/storage/sqlite3/sql.go
@@ -0,0 +1,60 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"database/sql"
+)
+
+type statements struct {
+	eventTypeStatements
+	eventStateKeyStatements
+	roomStatements
+	eventStatements
+	eventJSONStatements
+	stateSnapshotStatements
+	stateBlockStatements
+	previousEventStatements
+	roomAliasesStatements
+	inviteStatements
+	membershipStatements
+	transactionStatements
+}
+
+func (s *statements) prepare(db *sql.DB) error {
+	var err error
+
+	for _, prepare := range []func(db *sql.DB) error{
+		s.eventTypeStatements.prepare,
+		s.eventStateKeyStatements.prepare,
+		s.roomStatements.prepare,
+		s.eventStatements.prepare,
+		s.eventJSONStatements.prepare,
+		s.stateSnapshotStatements.prepare,
+		s.stateBlockStatements.prepare,
+		s.previousEventStatements.prepare,
+		s.roomAliasesStatements.prepare,
+		s.inviteStatements.prepare,
+		s.membershipStatements.prepare,
+		s.transactionStatements.prepare,
+	} {
+		if err = prepare(db); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
diff --git a/roomserver/storage/sqlite3/state_block_table.go b/roomserver/storage/sqlite3/state_block_table.go
new file mode 100644
index 00000000..ac593546
--- /dev/null
+++ b/roomserver/storage/sqlite3/state_block_table.go
@@ -0,0 +1,292 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+	"github.com/matrix-org/util"
+)
+
+const stateDataSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_state_block (
+    state_block_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    event_type_nid INTEGER NOT NULL,
+    event_state_key_nid INTEGER NOT NULL,
+    event_nid INTEGER NOT NULL,
+    UNIQUE (state_block_nid, event_type_nid, event_state_key_nid)
+  );
+`
+
+const insertStateDataSQL = "" +
+	"INSERT INTO roomserver_state_block (state_block_nid, event_type_nid, event_state_key_nid, event_nid)" +
+	" VALUES ($1, $2, $3, $4)"
+
+const selectNextStateBlockNIDSQL = `
+	SELECT COALESCE((
+		SELECT seq+1 AS state_block_nid FROM sqlite_sequence
+		WHERE name = 'roomserver_state_block'), 1
+	) AS state_block_nid
+`
+
+// Bulk state lookup by numeric state block ID.
+// Sort by the state_block_nid, event_type_nid, event_state_key_nid
+// This means that all the entries for a given state_block_nid will appear
+// together in the list and those entries will sorted by event_type_nid
+// and event_state_key_nid. This property makes it easier to merge two
+// state data blocks together.
+const bulkSelectStateBlockEntriesSQL = "" +
+	"SELECT state_block_nid, event_type_nid, event_state_key_nid, event_nid" +
+	" FROM roomserver_state_block WHERE state_block_nid IN ($1)" +
+	" ORDER BY state_block_nid, event_type_nid, event_state_key_nid"
+
+// Bulk state lookup by numeric state block ID.
+// Filters the rows in each block to the requested types and state keys.
+// We would like to restrict to particular type state key pairs but we are
+// restricted by the query language to pull the cross product of a list
+// of types and a list state_keys. So we have to filter the result in the
+// application to restrict it to the list of event types and state keys we
+// actually wanted.
+const bulkSelectFilteredStateBlockEntriesSQL = "" +
+	"SELECT state_block_nid, event_type_nid, event_state_key_nid, event_nid" +
+	" FROM roomserver_state_block WHERE state_block_nid IN ($1)" +
+	" AND event_type_nid IN ($2) AND event_state_key_nid IN ($3)" +
+	" ORDER BY state_block_nid, event_type_nid, event_state_key_nid"
+
+type stateBlockStatements struct {
+	db                                      *sql.DB
+	insertStateDataStmt                     *sql.Stmt
+	selectNextStateBlockNIDStmt             *sql.Stmt
+	bulkSelectStateBlockEntriesStmt         *sql.Stmt
+	bulkSelectFilteredStateBlockEntriesStmt *sql.Stmt
+}
+
+func (s *stateBlockStatements) prepare(db *sql.DB) (err error) {
+	s.db = db
+	_, err = db.Exec(stateDataSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertStateDataStmt, insertStateDataSQL},
+		{&s.selectNextStateBlockNIDStmt, selectNextStateBlockNIDSQL},
+		{&s.bulkSelectStateBlockEntriesStmt, bulkSelectStateBlockEntriesSQL},
+		{&s.bulkSelectFilteredStateBlockEntriesStmt, bulkSelectFilteredStateBlockEntriesSQL},
+	}.prepare(db)
+}
+
+func (s *stateBlockStatements) bulkInsertStateData(
+	ctx context.Context, txn *sql.Tx,
+	stateBlockNID types.StateBlockNID,
+	entries []types.StateEntry,
+) error {
+	for _, entry := range entries {
+		_, err := common.TxStmt(txn, s.insertStateDataStmt).ExecContext(
+			ctx,
+			int64(stateBlockNID),
+			int64(entry.EventTypeNID),
+			int64(entry.EventStateKeyNID),
+			int64(entry.EventNID),
+		)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *stateBlockStatements) selectNextStateBlockNID(
+	ctx context.Context,
+	txn *sql.Tx,
+) (types.StateBlockNID, error) {
+	var stateBlockNID int64
+	selectStmt := common.TxStmt(txn, s.selectNextStateBlockNIDStmt)
+	err := selectStmt.QueryRowContext(ctx).Scan(&stateBlockNID)
+	return types.StateBlockNID(stateBlockNID), err
+}
+
+func (s *stateBlockStatements) bulkSelectStateBlockEntries(
+	ctx context.Context, txn *sql.Tx, stateBlockNIDs []types.StateBlockNID,
+) ([]types.StateEntryList, error) {
+	nids := make([]interface{}, len(stateBlockNIDs))
+	for k, v := range stateBlockNIDs {
+		nids[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectStateBlockEntriesSQL, "($1)", common.QueryVariadic(len(nids)), 1)
+	selectPrep, err := s.db.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	selectStmt := common.TxStmt(txn, selectPrep)
+	rows, err := selectStmt.QueryContext(ctx, nids...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	results := make([]types.StateEntryList, len(stateBlockNIDs))
+	// current is a pointer to the StateEntryList to append the state entries to.
+	var current *types.StateEntryList
+	i := 0
+	for rows.Next() {
+		var (
+			stateBlockNID    int64
+			eventTypeNID     int64
+			eventStateKeyNID int64
+			eventNID         int64
+			entry            types.StateEntry
+		)
+		if err := rows.Scan(
+			&stateBlockNID, &eventTypeNID, &eventStateKeyNID, &eventNID,
+		); err != nil {
+			return nil, err
+		}
+		entry.EventTypeNID = types.EventTypeNID(eventTypeNID)
+		entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
+		entry.EventNID = types.EventNID(eventNID)
+		if current == nil || types.StateBlockNID(stateBlockNID) != current.StateBlockNID {
+			// The state entry row is for a different state data block to the current one.
+			// So we start appending to the next entry in the list.
+			current = &results[i]
+			current.StateBlockNID = types.StateBlockNID(stateBlockNID)
+			i++
+		}
+		current.StateEntries = append(current.StateEntries, entry)
+	}
+	if i != len(nids) {
+		return nil, fmt.Errorf("storage: state data NIDs missing from the database (%d != %d)", i, len(nids))
+	}
+	return results, nil
+}
+
+func (s *stateBlockStatements) bulkSelectFilteredStateBlockEntries(
+	ctx context.Context, txn *sql.Tx, // nolint: unparam
+	stateBlockNIDs []types.StateBlockNID,
+	stateKeyTuples []types.StateKeyTuple,
+) ([]types.StateEntryList, error) {
+	tuples := stateKeyTupleSorter(stateKeyTuples)
+	// Sort the tuples so that we can run binary search against them as we filter the rows returned by the db.
+	sort.Sort(tuples)
+
+	eventTypeNIDArray, eventStateKeyNIDArray := tuples.typesAndStateKeysAsArrays()
+	sqlStatement := strings.Replace(bulkSelectFilteredStateBlockEntriesSQL, "($1)", common.QueryVariadic(len(stateBlockNIDs)), 1)
+	sqlStatement = strings.Replace(sqlStatement, "($2)", common.QueryVariadicOffset(len(eventTypeNIDArray), len(stateBlockNIDs)), 1)
+	sqlStatement = strings.Replace(sqlStatement, "($3)", common.QueryVariadicOffset(len(eventStateKeyNIDArray), len(stateBlockNIDs)+len(eventTypeNIDArray)), 1)
+
+	var params []interface{}
+	for _, val := range stateBlockNIDs {
+		params = append(params, int64(val))
+	}
+	for _, val := range eventTypeNIDArray {
+		params = append(params, val)
+	}
+	for _, val := range eventStateKeyNIDArray {
+		params = append(params, val)
+	}
+
+	rows, err := s.db.QueryContext(
+		ctx,
+		sqlStatement,
+		params...,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	var results []types.StateEntryList
+	var current types.StateEntryList
+	for rows.Next() {
+		var (
+			stateBlockNID    int64
+			eventTypeNID     int64
+			eventStateKeyNID int64
+			eventNID         int64
+			entry            types.StateEntry
+		)
+		if err := rows.Scan(
+			&stateBlockNID, &eventTypeNID, &eventStateKeyNID, &eventNID,
+		); err != nil {
+			return nil, err
+		}
+		entry.EventTypeNID = types.EventTypeNID(eventTypeNID)
+		entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
+		entry.EventNID = types.EventNID(eventNID)
+
+		// We can use binary search here because we sorted the tuples earlier
+		if !tuples.contains(entry.StateKeyTuple) {
+			// The select will return the cross product of types and state keys.
+			// So we need to check if type of the entry is in the list.
+			continue
+		}
+
+		if types.StateBlockNID(stateBlockNID) != current.StateBlockNID {
+			// The state entry row is for a different state data block to the current one.
+			// So we append the current entry to the results and start adding to a new one.
+			// The first time through the loop current will be empty.
+			if current.StateEntries != nil {
+				results = append(results, current)
+			}
+			current = types.StateEntryList{StateBlockNID: types.StateBlockNID(stateBlockNID)}
+		}
+		current.StateEntries = append(current.StateEntries, entry)
+	}
+	// Add the last entry to the list if it is not empty.
+	if current.StateEntries != nil {
+		results = append(results, current)
+	}
+	return results, nil
+}
+
+type stateKeyTupleSorter []types.StateKeyTuple
+
+func (s stateKeyTupleSorter) Len() int           { return len(s) }
+func (s stateKeyTupleSorter) Less(i, j int) bool { return s[i].LessThan(s[j]) }
+func (s stateKeyTupleSorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
+// Check whether a tuple is in the list. Assumes that the list is sorted.
+func (s stateKeyTupleSorter) contains(value types.StateKeyTuple) bool {
+	i := sort.Search(len(s), func(i int) bool { return !s[i].LessThan(value) })
+	return i < len(s) && s[i] == value
+}
+
+// List the unique eventTypeNIDs and eventStateKeyNIDs.
+// Assumes that the list is sorted.
+func (s stateKeyTupleSorter) typesAndStateKeysAsArrays() (eventTypeNIDs pq.Int64Array, eventStateKeyNIDs pq.Int64Array) {
+	eventTypeNIDs = make(pq.Int64Array, len(s))
+	eventStateKeyNIDs = make(pq.Int64Array, len(s))
+	for i := range s {
+		eventTypeNIDs[i] = int64(s[i].EventTypeNID)
+		eventStateKeyNIDs[i] = int64(s[i].EventStateKeyNID)
+	}
+	eventTypeNIDs = eventTypeNIDs[:util.SortAndUnique(int64Sorter(eventTypeNIDs))]
+	eventStateKeyNIDs = eventStateKeyNIDs[:util.SortAndUnique(int64Sorter(eventStateKeyNIDs))]
+	return
+}
+
+type int64Sorter []int64
+
+func (s int64Sorter) Len() int           { return len(s) }
+func (s int64Sorter) Less(i, j int) bool { return s[i] < s[j] }
+func (s int64Sorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
diff --git a/roomserver/storage/sqlite3/state_block_table_test.go b/roomserver/storage/sqlite3/state_block_table_test.go
new file mode 100644
index 00000000..98439f5c
--- /dev/null
+++ b/roomserver/storage/sqlite3/state_block_table_test.go
@@ -0,0 +1,86 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+func TestStateKeyTupleSorter(t *testing.T) {
+	input := stateKeyTupleSorter{
+		{EventTypeNID: 1, EventStateKeyNID: 2},
+		{EventTypeNID: 1, EventStateKeyNID: 4},
+		{EventTypeNID: 2, EventStateKeyNID: 2},
+		{EventTypeNID: 1, EventStateKeyNID: 1},
+	}
+	want := []types.StateKeyTuple{
+		{EventTypeNID: 1, EventStateKeyNID: 1},
+		{EventTypeNID: 1, EventStateKeyNID: 2},
+		{EventTypeNID: 1, EventStateKeyNID: 4},
+		{EventTypeNID: 2, EventStateKeyNID: 2},
+	}
+	doNotWant := []types.StateKeyTuple{
+		{EventTypeNID: 0, EventStateKeyNID: 0},
+		{EventTypeNID: 1, EventStateKeyNID: 3},
+		{EventTypeNID: 2, EventStateKeyNID: 1},
+		{EventTypeNID: 3, EventStateKeyNID: 1},
+	}
+	wantTypeNIDs := []int64{1, 2}
+	wantStateKeyNIDs := []int64{1, 2, 4}
+
+	// Sort the input and check it's in the right order.
+	sort.Sort(input)
+	gotTypeNIDs, gotStateKeyNIDs := input.typesAndStateKeysAsArrays()
+
+	for i := range want {
+		if input[i] != want[i] {
+			t.Errorf("Wanted %#v at index %d got %#v", want[i], i, input[i])
+		}
+
+		if !input.contains(want[i]) {
+			t.Errorf("Wanted %#v.contains(%#v) to be true but got false", input, want[i])
+		}
+	}
+
+	for i := range doNotWant {
+		if input.contains(doNotWant[i]) {
+			t.Errorf("Wanted %#v.contains(%#v) to be false but got true", input, doNotWant[i])
+		}
+	}
+
+	if len(wantTypeNIDs) != len(gotTypeNIDs) {
+		t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
+	}
+
+	for i := range wantTypeNIDs {
+		if wantTypeNIDs[i] != gotTypeNIDs[i] {
+			t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
+		}
+	}
+
+	if len(wantStateKeyNIDs) != len(gotStateKeyNIDs) {
+		t.Fatalf("Wanted state key NIDs %#v got %#v", wantStateKeyNIDs, gotStateKeyNIDs)
+	}
+
+	for i := range wantStateKeyNIDs {
+		if wantStateKeyNIDs[i] != gotStateKeyNIDs[i] {
+			t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
+		}
+	}
+}
diff --git a/roomserver/storage/sqlite3/state_snapshot_table.go b/roomserver/storage/sqlite3/state_snapshot_table.go
new file mode 100644
index 00000000..df97aa41
--- /dev/null
+++ b/roomserver/storage/sqlite3/state_snapshot_table.go
@@ -0,0 +1,120 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const stateSnapshotSchema = `
+  CREATE TABLE IF NOT EXISTS roomserver_state_snapshots (
+    state_snapshot_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    room_nid INTEGER NOT NULL,
+    state_block_nids TEXT NOT NULL DEFAULT '{}'
+  );
+`
+
+const insertStateSQL = `
+	INSERT INTO roomserver_state_snapshots (room_nid, state_block_nids)
+	  VALUES ($1, $2);`
+
+// Bulk state data NID lookup.
+// Sorting by state_snapshot_nid means we can use binary search over the result
+// to lookup the state data NIDs for a state snapshot NID.
+const bulkSelectStateBlockNIDsSQL = "" +
+	"SELECT state_snapshot_nid, state_block_nids FROM roomserver_state_snapshots" +
+	" WHERE state_snapshot_nid IN ($1) ORDER BY state_snapshot_nid ASC"
+
+type stateSnapshotStatements struct {
+	db                           *sql.DB
+	insertStateStmt              *sql.Stmt
+	bulkSelectStateBlockNIDsStmt *sql.Stmt
+}
+
+func (s *stateSnapshotStatements) prepare(db *sql.DB) (err error) {
+	s.db = db
+	_, err = db.Exec(stateSnapshotSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertStateStmt, insertStateSQL},
+		{&s.bulkSelectStateBlockNIDsStmt, bulkSelectStateBlockNIDsSQL},
+	}.prepare(db)
+}
+
+func (s *stateSnapshotStatements) insertState(
+	ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID,
+) (stateNID types.StateSnapshotNID, err error) {
+	nids := make([]int64, len(stateBlockNIDs))
+	for i := range stateBlockNIDs {
+		nids[i] = int64(stateBlockNIDs[i])
+	}
+	insertStmt := txn.Stmt(s.insertStateStmt)
+	if res, err2 := insertStmt.ExecContext(ctx, int64(roomNID), pq.Int64Array(nids)); err2 == nil {
+		lastRowID, err3 := res.LastInsertId()
+		if err3 != nil {
+			err = err3
+		}
+		stateNID = types.StateSnapshotNID(lastRowID)
+	}
+	return
+}
+
+func (s *stateSnapshotStatements) bulkSelectStateBlockNIDs(
+	ctx context.Context, txn *sql.Tx, stateNIDs []types.StateSnapshotNID,
+) ([]types.StateBlockNIDList, error) {
+	nids := make([]interface{}, len(stateNIDs))
+	for k, v := range stateNIDs {
+		nids[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectStateBlockNIDsSQL, "($1)", common.QueryVariadic(len(nids)), 1)
+	selectStmt, err := txn.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := selectStmt.QueryContext(ctx, nids...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	results := make([]types.StateBlockNIDList, len(stateNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		var stateBlockNIDs pq.Int64Array
+		if err := rows.Scan(&result.StateSnapshotNID, &stateBlockNIDs); err != nil {
+			return nil, err
+		}
+		result.StateBlockNIDs = make([]types.StateBlockNID, len(stateBlockNIDs))
+		for k := range stateBlockNIDs {
+			result.StateBlockNIDs[k] = types.StateBlockNID(stateBlockNIDs[k])
+		}
+	}
+	if i != len(stateNIDs) {
+		return nil, fmt.Errorf("storage: state NIDs missing from the database (%d != %d)", i, len(stateNIDs))
+	}
+	return results, nil
+}
diff --git a/roomserver/storage/sqlite3/storage.go b/roomserver/storage/sqlite3/storage.go
new file mode 100644
index 00000000..e20e8aed
--- /dev/null
+++ b/roomserver/storage/sqlite3/storage.go
@@ -0,0 +1,864 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"net/url"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/roomserver/types"
+	"github.com/matrix-org/gomatrixserverlib"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// A Database is used to store room events and stream offsets.
+type Database struct {
+	statements statements
+	db         *sql.DB
+}
+
+// Open a postgres database.
+func Open(dataSourceName string) (*Database, error) {
+	var d Database
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	var cs string
+	if uri.Opaque != "" { // file:filename.db
+		cs = uri.Opaque
+	} else if uri.Path != "" { // file:///path/to/filename.db
+		cs = uri.Path
+	} else {
+		return nil, errors.New("no filename or path in connect string")
+	}
+	if d.db, err = sql.Open("sqlite3", cs); err != nil {
+		return nil, err
+	}
+	//d.db.Exec("PRAGMA journal_mode=WAL;")
+	//d.db.Exec("PRAGMA read_uncommitted = true;")
+	d.db.SetMaxOpenConns(2)
+	if err = d.statements.prepare(d.db); err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// StoreEvent implements input.EventDatabase
+func (d *Database) StoreEvent(
+	ctx context.Context, event gomatrixserverlib.Event,
+	txnAndSessionID *api.TransactionID, authEventNIDs []types.EventNID,
+) (types.RoomNID, types.StateAtEvent, error) {
+	var (
+		roomNID          types.RoomNID
+		eventTypeNID     types.EventTypeNID
+		eventStateKeyNID types.EventStateKeyNID
+		eventNID         types.EventNID
+		stateNID         types.StateSnapshotNID
+		err              error
+	)
+
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if txnAndSessionID != nil {
+			if err = d.statements.insertTransaction(
+				ctx, txn, txnAndSessionID.TransactionID,
+				txnAndSessionID.SessionID, event.Sender(), event.EventID(),
+			); err != nil {
+				return err
+			}
+		}
+
+		if roomNID, err = d.assignRoomNID(ctx, txn, event.RoomID()); err != nil {
+			return err
+		}
+
+		if eventTypeNID, err = d.assignEventTypeNID(ctx, txn, event.Type()); err != nil {
+			return err
+		}
+
+		eventStateKey := event.StateKey()
+		// Assigned a numeric ID for the state_key if there is one present.
+		// Otherwise set the numeric ID for the state_key to 0.
+		if eventStateKey != nil {
+			if eventStateKeyNID, err = d.assignStateKeyNID(ctx, txn, *eventStateKey); err != nil {
+				return err
+			}
+		}
+
+		if eventNID, stateNID, err = d.statements.insertEvent(
+			ctx,
+			txn,
+			roomNID,
+			eventTypeNID,
+			eventStateKeyNID,
+			event.EventID(),
+			event.EventReference().EventSHA256,
+			authEventNIDs,
+			event.Depth(),
+		); err != nil {
+			if err == sql.ErrNoRows {
+				// We've already inserted the event so select the numeric event ID
+				eventNID, stateNID, err = d.statements.selectEvent(ctx, txn, event.EventID())
+			}
+			if err != nil {
+				return err
+			}
+		}
+
+		if err = d.statements.insertEventJSON(ctx, txn, eventNID, event.JSON()); err != nil {
+			return err
+		}
+
+		return nil
+	})
+	if err != nil {
+		return 0, types.StateAtEvent{}, err
+	}
+
+	return roomNID, types.StateAtEvent{
+		BeforeStateSnapshotNID: stateNID,
+		StateEntry: types.StateEntry{
+			StateKeyTuple: types.StateKeyTuple{
+				EventTypeNID:     eventTypeNID,
+				EventStateKeyNID: eventStateKeyNID,
+			},
+			EventNID: eventNID,
+		},
+	}, nil
+}
+
+func (d *Database) assignRoomNID(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (roomNID types.RoomNID, err error) {
+	// Check if we already have a numeric ID in the database.
+	roomNID, err = d.statements.selectRoomNID(ctx, txn, roomID)
+	if err == sql.ErrNoRows {
+		// We don't have a numeric ID so insert one into the database.
+		roomNID, err = d.statements.insertRoomNID(ctx, txn, roomID)
+		if err == nil {
+			// Now get the numeric ID back out of the database
+			roomNID, err = d.statements.selectRoomNID(ctx, txn, roomID)
+		}
+	}
+	return
+}
+
+func (d *Database) assignEventTypeNID(
+	ctx context.Context, txn *sql.Tx, eventType string,
+) (eventTypeNID types.EventTypeNID, err error) {
+	// Check if we already have a numeric ID in the database.
+	eventTypeNID, err = d.statements.selectEventTypeNID(ctx, txn, eventType)
+	if err == sql.ErrNoRows {
+		// We don't have a numeric ID so insert one into the database.
+		eventTypeNID, err = d.statements.insertEventTypeNID(ctx, txn, eventType)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			eventTypeNID, err = d.statements.selectEventTypeNID(ctx, txn, eventType)
+		}
+	}
+	return
+}
+
+func (d *Database) assignStateKeyNID(
+	ctx context.Context, txn *sql.Tx, eventStateKey string,
+) (eventStateKeyNID types.EventStateKeyNID, err error) {
+	// Check if we already have a numeric ID in the database.
+	eventStateKeyNID, err = d.statements.selectEventStateKeyNID(ctx, txn, eventStateKey)
+	if err == sql.ErrNoRows {
+		// We don't have a numeric ID so insert one into the database.
+		eventStateKeyNID, err = d.statements.insertEventStateKeyNID(ctx, txn, eventStateKey)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			eventStateKeyNID, err = d.statements.selectEventStateKeyNID(ctx, txn, eventStateKey)
+		}
+	}
+	return
+}
+
+// StateEntriesForEventIDs implements input.EventDatabase
+func (d *Database) StateEntriesForEventIDs(
+	ctx context.Context, eventIDs []string,
+) (se []types.StateEntry, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		se, err = d.statements.bulkSelectStateEventByID(ctx, txn, eventIDs)
+		return err
+	})
+	return
+}
+
+// EventTypeNIDs implements state.RoomStateDatabase
+func (d *Database) EventTypeNIDs(
+	ctx context.Context, eventTypes []string,
+) (etnids map[string]types.EventTypeNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		etnids, err = d.statements.bulkSelectEventTypeNID(ctx, txn, eventTypes)
+		return err
+	})
+	return
+}
+
+// EventStateKeyNIDs implements state.RoomStateDatabase
+func (d *Database) EventStateKeyNIDs(
+	ctx context.Context, eventStateKeys []string,
+) (esknids map[string]types.EventStateKeyNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		esknids, err = d.statements.bulkSelectEventStateKeyNID(ctx, txn, eventStateKeys)
+		return err
+	})
+	return
+}
+
+// EventStateKeys implements query.RoomserverQueryAPIDatabase
+func (d *Database) EventStateKeys(
+	ctx context.Context, eventStateKeyNIDs []types.EventStateKeyNID,
+) (out map[types.EventStateKeyNID]string, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		out, err = d.statements.bulkSelectEventStateKey(ctx, txn, eventStateKeyNIDs)
+		return err
+	})
+	return
+}
+
+// EventNIDs implements query.RoomserverQueryAPIDatabase
+func (d *Database) EventNIDs(
+	ctx context.Context, eventIDs []string,
+) (out map[string]types.EventNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		out, err = d.statements.bulkSelectEventNID(ctx, txn, eventIDs)
+		return err
+	})
+	return
+}
+
+// Events implements input.EventDatabase
+func (d *Database) Events(
+	ctx context.Context, eventNIDs []types.EventNID,
+) ([]types.Event, error) {
+	var eventJSONs []eventJSONPair
+	var err error
+	results := make([]types.Event, len(eventNIDs))
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		eventJSONs, err = d.statements.bulkSelectEventJSON(ctx, txn, eventNIDs)
+		if err != nil || len(eventJSONs) == 0 {
+			return nil
+		}
+		for i, eventJSON := range eventJSONs {
+			result := &results[i]
+			result.EventNID = eventJSON.EventNID
+			// TODO: Use NewEventFromTrustedJSON for efficiency
+			result.Event, err = gomatrixserverlib.NewEventFromUntrustedJSON(eventJSON.EventJSON)
+			if err != nil {
+				return nil
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		return []types.Event{}, err
+	}
+	return results, nil
+}
+
+// AddState implements input.EventDatabase
+func (d *Database) AddState(
+	ctx context.Context,
+	roomNID types.RoomNID,
+	stateBlockNIDs []types.StateBlockNID,
+	state []types.StateEntry,
+) (stateNID types.StateSnapshotNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if len(state) > 0 {
+			var stateBlockNID types.StateBlockNID
+			stateBlockNID, err = d.statements.selectNextStateBlockNID(ctx, txn)
+			if err != nil {
+				return err
+			}
+			if err = d.statements.bulkInsertStateData(ctx, txn, stateBlockNID, state); err != nil {
+				return err
+			}
+			stateBlockNIDs = append(stateBlockNIDs[:len(stateBlockNIDs):len(stateBlockNIDs)], stateBlockNID)
+		}
+		stateNID, err = d.statements.insertState(ctx, txn, roomNID, stateBlockNIDs)
+		return err
+	})
+	if err != nil {
+		return 0, err
+	}
+	return
+}
+
+// SetState implements input.EventDatabase
+func (d *Database) SetState(
+	ctx context.Context, eventNID types.EventNID, stateNID types.StateSnapshotNID,
+) error {
+	e := common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		return d.statements.updateEventState(ctx, txn, eventNID, stateNID)
+	})
+	return e
+}
+
+// StateAtEventIDs implements input.EventDatabase
+func (d *Database) StateAtEventIDs(
+	ctx context.Context, eventIDs []string,
+) (se []types.StateAtEvent, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		se, err = d.statements.bulkSelectStateAtEventByID(ctx, txn, eventIDs)
+		return err
+	})
+	return
+}
+
+// StateBlockNIDs implements state.RoomStateDatabase
+func (d *Database) StateBlockNIDs(
+	ctx context.Context, stateNIDs []types.StateSnapshotNID,
+) (sl []types.StateBlockNIDList, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		sl, err = d.statements.bulkSelectStateBlockNIDs(ctx, txn, stateNIDs)
+		return err
+	})
+	return
+}
+
+// StateEntries implements state.RoomStateDatabase
+func (d *Database) StateEntries(
+	ctx context.Context, stateBlockNIDs []types.StateBlockNID,
+) (sel []types.StateEntryList, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		sel, err = d.statements.bulkSelectStateBlockEntries(ctx, txn, stateBlockNIDs)
+		return err
+	})
+	return
+}
+
+// SnapshotNIDFromEventID implements state.RoomStateDatabase
+func (d *Database) SnapshotNIDFromEventID(
+	ctx context.Context, eventID string,
+) (stateNID types.StateSnapshotNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		_, stateNID, err = d.statements.selectEvent(ctx, txn, eventID)
+		return err
+	})
+	return
+}
+
+// EventIDs implements input.RoomEventDatabase
+func (d *Database) EventIDs(
+	ctx context.Context, eventNIDs []types.EventNID,
+) (out map[types.EventNID]string, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		out, err = d.statements.bulkSelectEventID(ctx, txn, eventNIDs)
+		return err
+	})
+	return
+}
+
+// GetLatestEventsForUpdate implements input.EventDatabase
+func (d *Database) GetLatestEventsForUpdate(
+	ctx context.Context, roomNID types.RoomNID,
+) (types.RoomRecentEventsUpdater, error) {
+	txn, err := d.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	eventNIDs, lastEventNIDSent, currentStateSnapshotNID, err :=
+		d.statements.selectLatestEventsNIDsForUpdate(ctx, txn, roomNID)
+	if err != nil {
+		txn.Rollback() // nolint: errcheck
+		return nil, err
+	}
+	stateAndRefs, err := d.statements.bulkSelectStateAtEventAndReference(ctx, txn, eventNIDs)
+	if err != nil {
+		txn.Rollback() // nolint: errcheck
+		return nil, err
+	}
+	var lastEventIDSent string
+	if lastEventNIDSent != 0 {
+		lastEventIDSent, err = d.statements.selectEventID(ctx, txn, lastEventNIDSent)
+		if err != nil {
+			txn.Rollback() // nolint: errcheck
+			return nil, err
+		}
+	}
+
+	// FIXME: we probably want to support long-lived txns in sqlite somehow, but we don't because we get
+	// 'database is locked' errors caused by multiple write txns (one being the long-lived txn created here)
+	// so for now let's not use a long-lived txn at all, and just commit it here and set the txn to nil so
+	// we fail fast if someone tries to use the underlying txn object.
+	err = txn.Commit()
+	if err != nil {
+		return nil, err
+	}
+	return &roomRecentEventsUpdater{
+		transaction{ctx, nil}, d, roomNID, stateAndRefs, lastEventIDSent, currentStateSnapshotNID,
+	}, nil
+}
+
+// GetTransactionEventID implements input.EventDatabase
+func (d *Database) GetTransactionEventID(
+	ctx context.Context, transactionID string,
+	sessionID int64, userID string,
+) (string, error) {
+	eventID, err := d.statements.selectTransactionEventID(ctx, nil, transactionID, sessionID, userID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return eventID, err
+}
+
+type roomRecentEventsUpdater struct {
+	transaction
+	d                       *Database
+	roomNID                 types.RoomNID
+	latestEvents            []types.StateAtEventAndReference
+	lastEventIDSent         string
+	currentStateSnapshotNID types.StateSnapshotNID
+}
+
+// LatestEvents implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) LatestEvents() []types.StateAtEventAndReference {
+	return u.latestEvents
+}
+
+// LastEventIDSent implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) LastEventIDSent() string {
+	return u.lastEventIDSent
+}
+
+// CurrentStateSnapshotNID implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) CurrentStateSnapshotNID() types.StateSnapshotNID {
+	return u.currentStateSnapshotNID
+}
+
+// StorePreviousEvents implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) StorePreviousEvents(eventNID types.EventNID, previousEventReferences []gomatrixserverlib.EventReference) error {
+	err := common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		for _, ref := range previousEventReferences {
+			if err := u.d.statements.insertPreviousEvent(u.ctx, txn, ref.EventID, ref.EventSHA256, eventNID); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	return err
+}
+
+// IsReferenced implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) IsReferenced(eventReference gomatrixserverlib.EventReference) (res bool, err error) {
+	err = common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		err := u.d.statements.selectPreviousEventExists(u.ctx, txn, eventReference.EventID, eventReference.EventSHA256)
+		if err == nil {
+			res = true
+			err = nil
+		}
+		if err == sql.ErrNoRows {
+			res = false
+			err = nil
+		}
+		return err
+	})
+	return
+}
+
+// SetLatestEvents implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) SetLatestEvents(
+	roomNID types.RoomNID, latest []types.StateAtEventAndReference, lastEventNIDSent types.EventNID,
+	currentStateSnapshotNID types.StateSnapshotNID,
+) error {
+	err := common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		eventNIDs := make([]types.EventNID, len(latest))
+		for i := range latest {
+			eventNIDs[i] = latest[i].EventNID
+		}
+		return u.d.statements.updateLatestEventNIDs(u.ctx, txn, roomNID, eventNIDs, lastEventNIDSent, currentStateSnapshotNID)
+	})
+	return err
+}
+
+// HasEventBeenSent implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) HasEventBeenSent(eventNID types.EventNID) (res bool, err error) {
+	err = common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		res, err = u.d.statements.selectEventSentToOutput(u.ctx, txn, eventNID)
+		return err
+	})
+	return
+}
+
+// MarkEventAsSent implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) MarkEventAsSent(eventNID types.EventNID) error {
+	err := common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		return u.d.statements.updateEventSentToOutput(u.ctx, txn, eventNID)
+	})
+	return err
+}
+
+func (u *roomRecentEventsUpdater) MembershipUpdater(targetUserNID types.EventStateKeyNID) (mu types.MembershipUpdater, err error) {
+	err = common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		mu, err = u.d.membershipUpdaterTxn(u.ctx, txn, u.roomNID, targetUserNID)
+		return err
+	})
+	return
+}
+
+// RoomNID implements query.RoomserverQueryAPIDB
+func (d *Database) RoomNID(ctx context.Context, roomID string) (roomNID types.RoomNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		roomNID, err = d.statements.selectRoomNID(ctx, txn, roomID)
+		if err == sql.ErrNoRows {
+			roomNID = 0
+			err = nil
+		}
+		return err
+	})
+	return
+}
+
+// LatestEventIDs implements query.RoomserverQueryAPIDatabase
+func (d *Database) LatestEventIDs(
+	ctx context.Context, roomNID types.RoomNID,
+) (references []gomatrixserverlib.EventReference, currentStateSnapshotNID types.StateSnapshotNID, depth int64, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		var eventNIDs []types.EventNID
+		eventNIDs, currentStateSnapshotNID, err = d.statements.selectLatestEventNIDs(ctx, txn, roomNID)
+		if err != nil {
+			return err
+		}
+		references, err = d.statements.bulkSelectEventReference(ctx, txn, eventNIDs)
+		if err != nil {
+			return err
+		}
+		depth, err = d.statements.selectMaxEventDepth(ctx, txn, eventNIDs)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+	return
+}
+
+// GetInvitesForUser implements query.RoomserverQueryAPIDatabase
+func (d *Database) GetInvitesForUser(
+	ctx context.Context,
+	roomNID types.RoomNID,
+	targetUserNID types.EventStateKeyNID,
+) (senderUserIDs []types.EventStateKeyNID, err error) {
+	return d.statements.selectInviteActiveForUserInRoom(ctx, targetUserNID, roomNID)
+}
+
+// SetRoomAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) SetRoomAlias(ctx context.Context, alias string, roomID string, creatorUserID string) error {
+	return d.statements.insertRoomAlias(ctx, nil, alias, roomID, creatorUserID)
+}
+
+// GetRoomIDForAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) GetRoomIDForAlias(ctx context.Context, alias string) (string, error) {
+	return d.statements.selectRoomIDFromAlias(ctx, nil, alias)
+}
+
+// GetAliasesForRoomID implements alias.RoomserverAliasAPIDB
+func (d *Database) GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error) {
+	return d.statements.selectAliasesFromRoomID(ctx, nil, roomID)
+}
+
+// GetCreatorIDForAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) GetCreatorIDForAlias(
+	ctx context.Context, alias string,
+) (string, error) {
+	return d.statements.selectCreatorIDFromAlias(ctx, nil, alias)
+}
+
+// RemoveRoomAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) RemoveRoomAlias(ctx context.Context, alias string) error {
+	return d.statements.deleteRoomAlias(ctx, nil, alias)
+}
+
+// StateEntriesForTuples implements state.RoomStateDatabase
+func (d *Database) StateEntriesForTuples(
+	ctx context.Context,
+	stateBlockNIDs []types.StateBlockNID,
+	stateKeyTuples []types.StateKeyTuple,
+) ([]types.StateEntryList, error) {
+	return d.statements.bulkSelectFilteredStateBlockEntries(
+		ctx, nil, stateBlockNIDs, stateKeyTuples,
+	)
+}
+
+// MembershipUpdater implements input.RoomEventDatabase
+func (d *Database) MembershipUpdater(
+	ctx context.Context, roomID, targetUserID string,
+) (types.MembershipUpdater, error) {
+	txn, err := d.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	succeeded := false
+	defer func() {
+		if !succeeded {
+			txn.Rollback() // nolint: errcheck
+		}
+	}()
+
+	roomNID, err := d.assignRoomNID(ctx, txn, roomID)
+	if err != nil {
+		return nil, err
+	}
+
+	targetUserNID, err := d.assignStateKeyNID(ctx, txn, targetUserID)
+	if err != nil {
+		return nil, err
+	}
+
+	updater, err := d.membershipUpdaterTxn(ctx, txn, roomNID, targetUserNID)
+	if err != nil {
+		return nil, err
+	}
+
+	succeeded = true
+	return updater, nil
+}
+
+type membershipUpdater struct {
+	transaction
+	d             *Database
+	roomNID       types.RoomNID
+	targetUserNID types.EventStateKeyNID
+	membership    membershipState
+}
+
+func (d *Database) membershipUpdaterTxn(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomNID types.RoomNID,
+	targetUserNID types.EventStateKeyNID,
+) (types.MembershipUpdater, error) {
+
+	if err := d.statements.insertMembership(ctx, txn, roomNID, targetUserNID); err != nil {
+		return nil, err
+	}
+
+	membership, err := d.statements.selectMembershipForUpdate(ctx, txn, roomNID, targetUserNID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &membershipUpdater{
+		transaction{ctx, txn}, d, roomNID, targetUserNID, membership,
+	}, nil
+}
+
+// IsInvite implements types.MembershipUpdater
+func (u *membershipUpdater) IsInvite() bool {
+	return u.membership == membershipStateInvite
+}
+
+// IsJoin implements types.MembershipUpdater
+func (u *membershipUpdater) IsJoin() bool {
+	return u.membership == membershipStateJoin
+}
+
+// IsLeave implements types.MembershipUpdater
+func (u *membershipUpdater) IsLeave() bool {
+	return u.membership == membershipStateLeaveOrBan
+}
+
+// SetToInvite implements types.MembershipUpdater
+func (u *membershipUpdater) SetToInvite(event gomatrixserverlib.Event) (inserted bool, err error) {
+	err = common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		senderUserNID, err := u.d.assignStateKeyNID(u.ctx, txn, event.Sender())
+		if err != nil {
+			return err
+		}
+		inserted, err = u.d.statements.insertInviteEvent(
+			u.ctx, txn, event.EventID(), u.roomNID, u.targetUserNID, senderUserNID, event.JSON(),
+		)
+		if err != nil {
+			return err
+		}
+		if u.membership != membershipStateInvite {
+			if err = u.d.statements.updateMembership(
+				u.ctx, txn, u.roomNID, u.targetUserNID, senderUserNID, membershipStateInvite, 0,
+			); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	return
+}
+
+// SetToJoin implements types.MembershipUpdater
+func (u *membershipUpdater) SetToJoin(senderUserID string, eventID string, isUpdate bool) (inviteEventIDs []string, err error) {
+	err = common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		senderUserNID, err := u.d.assignStateKeyNID(u.ctx, txn, senderUserID)
+		if err != nil {
+			return err
+		}
+
+		// If this is a join event update, there is no invite to update
+		if !isUpdate {
+			inviteEventIDs, err = u.d.statements.updateInviteRetired(
+				u.ctx, txn, u.roomNID, u.targetUserNID,
+			)
+			if err != nil {
+				return err
+			}
+		}
+
+		// Look up the NID of the new join event
+		nIDs, err := u.d.EventNIDs(u.ctx, []string{eventID})
+		if err != nil {
+			return err
+		}
+
+		if u.membership != membershipStateJoin || isUpdate {
+			if err = u.d.statements.updateMembership(
+				u.ctx, txn, u.roomNID, u.targetUserNID, senderUserNID,
+				membershipStateJoin, nIDs[eventID],
+			); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+
+	return
+}
+
+// SetToLeave implements types.MembershipUpdater
+func (u *membershipUpdater) SetToLeave(senderUserID string, eventID string) (inviteEventIDs []string, err error) {
+	err = common.WithTransaction(u.d.db, func(txn *sql.Tx) error {
+		senderUserNID, err := u.d.assignStateKeyNID(u.ctx, txn, senderUserID)
+		if err != nil {
+			return err
+		}
+		inviteEventIDs, err = u.d.statements.updateInviteRetired(
+			u.ctx, txn, u.roomNID, u.targetUserNID,
+		)
+		if err != nil {
+			return err
+		}
+
+		// Look up the NID of the new leave event
+		nIDs, err := u.d.EventNIDs(u.ctx, []string{eventID})
+		if err != nil {
+			return err
+		}
+
+		if u.membership != membershipStateLeaveOrBan {
+			if err = u.d.statements.updateMembership(
+				u.ctx, txn, u.roomNID, u.targetUserNID, senderUserNID,
+				membershipStateLeaveOrBan, nIDs[eventID],
+			); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	return
+}
+
+// GetMembership implements query.RoomserverQueryAPIDB
+func (d *Database) GetMembership(
+	ctx context.Context, roomNID types.RoomNID, requestSenderUserID string,
+) (membershipEventNID types.EventNID, stillInRoom bool, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		requestSenderUserNID, err := d.assignStateKeyNID(ctx, txn, requestSenderUserID)
+		if err != nil {
+			return err
+		}
+
+		membershipEventNID, _, err =
+			d.statements.selectMembershipFromRoomAndTarget(
+				ctx, txn, roomNID, requestSenderUserNID,
+			)
+		if err == sql.ErrNoRows {
+			// The user has never been a member of that room
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		stillInRoom = true
+		return nil
+	})
+
+	return
+}
+
+// GetMembershipEventNIDsForRoom implements query.RoomserverQueryAPIDB
+func (d *Database) GetMembershipEventNIDsForRoom(
+	ctx context.Context, roomNID types.RoomNID, joinOnly bool,
+) (eventNIDs []types.EventNID, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if joinOnly {
+			eventNIDs, err = d.statements.selectMembershipsFromRoomAndMembership(
+				ctx, txn, roomNID, membershipStateJoin,
+			)
+			return nil
+		}
+
+		eventNIDs, err = d.statements.selectMembershipsFromRoom(ctx, txn, roomNID)
+		return nil
+	})
+	return
+}
+
+// EventsFromIDs implements query.RoomserverQueryAPIEventDB
+func (d *Database) EventsFromIDs(ctx context.Context, eventIDs []string) ([]types.Event, error) {
+	nidMap, err := d.EventNIDs(ctx, eventIDs)
+	if err != nil {
+		return nil, err
+	}
+
+	var nids []types.EventNID
+	for _, nid := range nidMap {
+		nids = append(nids, nid)
+	}
+
+	return d.Events(ctx, nids)
+}
+
+func (d *Database) GetRoomVersionForRoom(
+	ctx context.Context, roomNID types.RoomNID,
+) (int64, error) {
+	return d.statements.selectRoomVersionForRoomNID(
+		ctx, nil, roomNID,
+	)
+}
+
+type transaction struct {
+	ctx context.Context
+	txn *sql.Tx
+}
+
+// Commit implements types.Transaction
+func (t *transaction) Commit() error {
+	if t.txn == nil {
+		return nil
+	}
+	return t.txn.Commit()
+}
+
+// Rollback implements types.Transaction
+func (t *transaction) Rollback() error {
+	if t.txn == nil {
+		return nil
+	}
+	return t.txn.Rollback()
+}
diff --git a/roomserver/storage/sqlite3/transactions_table.go b/roomserver/storage/sqlite3/transactions_table.go
new file mode 100644
index 00000000..7740e5f0
--- /dev/null
+++ b/roomserver/storage/sqlite3/transactions_table.go
@@ -0,0 +1,86 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+)
+
+const transactionsSchema = `
+	CREATE TABLE IF NOT EXISTS roomserver_transactions (
+		transaction_id TEXT NOT NULL,
+		session_id INTEGER NOT NULL,
+		user_id TEXT NOT NULL,
+		event_id TEXT NOT NULL,
+		PRIMARY KEY (transaction_id, session_id, user_id)
+	);
+`
+const insertTransactionSQL = `
+	INSERT INTO roomserver_transactions (transaction_id, session_id, user_id, event_id)
+	  VALUES ($1, $2, $3, $4)
+`
+
+const selectTransactionEventIDSQL = `
+	SELECT event_id FROM roomserver_transactions
+	  WHERE transaction_id = $1 AND session_id = $2 AND user_id = $3
+`
+
+type transactionStatements struct {
+	insertTransactionStmt        *sql.Stmt
+	selectTransactionEventIDStmt *sql.Stmt
+}
+
+func (s *transactionStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(transactionsSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertTransactionStmt, insertTransactionSQL},
+		{&s.selectTransactionEventIDStmt, selectTransactionEventIDSQL},
+	}.prepare(db)
+}
+
+func (s *transactionStatements) insertTransaction(
+	ctx context.Context, txn *sql.Tx,
+	transactionID string,
+	sessionID int64,
+	userID string,
+	eventID string,
+) (err error) {
+	stmt := common.TxStmt(txn, s.insertTransactionStmt)
+	_, err = stmt.ExecContext(
+		ctx, transactionID, sessionID, userID, eventID,
+	)
+	return
+}
+
+func (s *transactionStatements) selectTransactionEventID(
+	ctx context.Context, txn *sql.Tx,
+	transactionID string,
+	sessionID int64,
+	userID string,
+) (eventID string, err error) {
+	stmt := common.TxStmt(txn, s.selectTransactionEventIDStmt)
+	err = stmt.QueryRowContext(
+		ctx, transactionID, sessionID, userID,
+	).Scan(&eventID)
+	return
+}
diff --git a/roomserver/storage/storage.go b/roomserver/storage/storage.go
index 90841168..551d97cd 100644
--- a/roomserver/storage/storage.go
+++ b/roomserver/storage/storage.go
@@ -19,25 +19,20 @@ import (
 	"net/url"
 
 	"github.com/matrix-org/dendrite/roomserver/api"
+	statedb "github.com/matrix-org/dendrite/roomserver/state/database"
 	"github.com/matrix-org/dendrite/roomserver/storage/postgres"
+	"github.com/matrix-org/dendrite/roomserver/storage/sqlite3"
 	"github.com/matrix-org/dendrite/roomserver/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
 type Database interface {
+	statedb.RoomStateDatabase
 	StoreEvent(ctx context.Context, event gomatrixserverlib.Event, txnAndSessionID *api.TransactionID, authEventNIDs []types.EventNID) (types.RoomNID, types.StateAtEvent, error)
 	StateEntriesForEventIDs(ctx context.Context, eventIDs []string) ([]types.StateEntry, error)
-	EventTypeNIDs(ctx context.Context, eventTypes []string) (map[string]types.EventTypeNID, error)
-	EventStateKeyNIDs(ctx context.Context, eventStateKeys []string) (map[string]types.EventStateKeyNID, error)
 	EventStateKeys(ctx context.Context, eventStateKeyNIDs []types.EventStateKeyNID) (map[types.EventStateKeyNID]string, error)
 	EventNIDs(ctx context.Context, eventIDs []string) (map[string]types.EventNID, error)
-	Events(ctx context.Context, eventNIDs []types.EventNID) ([]types.Event, error)
-	AddState(ctx context.Context, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID, state []types.StateEntry) (types.StateSnapshotNID, error)
 	SetState(ctx context.Context, eventNID types.EventNID, stateNID types.StateSnapshotNID) error
-	StateAtEventIDs(ctx context.Context, eventIDs []string) ([]types.StateAtEvent, error)
-	StateBlockNIDs(ctx context.Context, stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
-	StateEntries(ctx context.Context, stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
-	SnapshotNIDFromEventID(ctx context.Context, eventID string) (types.StateSnapshotNID, error)
 	EventIDs(ctx context.Context, eventNIDs []types.EventNID) (map[types.EventNID]string, error)
 	GetLatestEventsForUpdate(ctx context.Context, roomNID types.RoomNID) (types.RoomRecentEventsUpdater, error)
 	GetTransactionEventID(ctx context.Context, transactionID string, sessionID int64, userID string) (string, error)
@@ -49,7 +44,6 @@ type Database interface {
 	GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error)
 	GetCreatorIDForAlias(ctx context.Context, alias string) (string, error)
 	RemoveRoomAlias(ctx context.Context, alias string) error
-	StateEntriesForTuples(ctx context.Context, stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple) ([]types.StateEntryList, error)
 	MembershipUpdater(ctx context.Context, roomID, targetUserID string) (types.MembershipUpdater, error)
 	GetMembership(ctx context.Context, roomNID types.RoomNID, requestSenderUserID string) (membershipEventNID types.EventNID, stillInRoom bool, err error)
 	GetMembershipEventNIDsForRoom(ctx context.Context, roomNID types.RoomNID, joinOnly bool) ([]types.EventNID, error)
@@ -66,6 +60,8 @@ func Open(dataSourceName string) (Database, error) {
 	switch uri.Scheme {
 	case "postgres":
 		return postgres.Open(dataSourceName)
+	case "file":
+		return sqlite3.Open(dataSourceName)
 	default:
 		return postgres.Open(dataSourceName)
 	}
diff --git a/syncapi/routing/routing.go b/syncapi/routing/routing.go
index 8916565d..be90e0a0 100644
--- a/syncapi/routing/routing.go
+++ b/syncapi/routing/routing.go
@@ -39,7 +39,7 @@ const pathPrefixR0 = "/_matrix/client/r0"
 // nolint: gocyclo
 func Setup(
 	apiMux *mux.Router, srp *sync.RequestPool, syncDB storage.Database,
-	deviceDB *devices.Database, federation *gomatrixserverlib.FederationClient,
+	deviceDB devices.Database, federation *gomatrixserverlib.FederationClient,
 	queryAPI api.RoomserverQueryAPI,
 	cfg *config.Dendrite,
 ) {
diff --git a/syncapi/storage/postgres/syncserver.go b/syncapi/storage/postgres/syncserver.go
index aec37185..6a33a8b4 100644
--- a/syncapi/storage/postgres/syncserver.go
+++ b/syncapi/storage/postgres/syncserver.go
@@ -413,13 +413,18 @@ func (d *SyncServerDatasource) addPDUDeltaToResponse(
 	numRecentEventsPerRoom int,
 	wantFullState bool,
 	res *types.Response,
-) ([]string, error) {
+) (joinedRoomIDs []string, err error) {
 	txn, err := d.db.BeginTx(ctx, &txReadOnlySnapshot)
 	if err != nil {
 		return nil, err
 	}
 	var succeeded bool
-	defer common.EndTransaction(txn, &succeeded)
+	defer func() {
+		txerr := common.EndTransaction(txn, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
 
 	stateFilter := gomatrixserverlib.DefaultStateFilter() // TODO: use filter provided in request
 
@@ -428,7 +433,6 @@ func (d *SyncServerDatasource) addPDUDeltaToResponse(
 	// This works out what the 'state' key should be for each room as well as which membership block
 	// to put the room into.
 	var deltas []stateDelta
-	var joinedRoomIDs []string
 	if !wantFullState {
 		deltas, joinedRoomIDs, err = d.getStateDeltas(
 			ctx, &device, txn, fromPos, toPos, device.UserID, &stateFilter,
@@ -570,7 +574,12 @@ func (d *SyncServerDatasource) getResponseWithPDUsForCompleteSync(
 		return
 	}
 	var succeeded bool
-	defer common.EndTransaction(txn, &succeeded)
+	defer func() {
+		txerr := common.EndTransaction(txn, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
 
 	// Get the current sync position which we will base the sync response on.
 	toPos, err = d.syncPositionTx(ctx, txn)
diff --git a/syncapi/storage/sqlite3/account_data_table.go b/syncapi/storage/sqlite3/account_data_table.go
new file mode 100644
index 00000000..3274e66e
--- /dev/null
+++ b/syncapi/storage/sqlite3/account_data_table.go
@@ -0,0 +1,143 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const accountDataSchema = `
+CREATE TABLE IF NOT EXISTS syncapi_account_data_type (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id TEXT NOT NULL,
+    room_id TEXT NOT NULL,
+    type TEXT NOT NULL,
+    UNIQUE (user_id, room_id, type)
+);
+`
+
+const insertAccountDataSQL = "" +
+	"INSERT INTO syncapi_account_data_type (id, user_id, room_id, type) VALUES ($1, $2, $3, $4)" +
+	" ON CONFLICT (user_id, room_id, type) DO UPDATE" +
+	" SET id = EXCLUDED.id"
+
+const selectAccountDataInRangeSQL = "" +
+	"SELECT room_id, type FROM syncapi_account_data_type" +
+	" WHERE user_id = $1 AND id > $2 AND id <= $3" +
+	" AND ( $4 IS NULL OR     type IN ($4)  )" +
+	" AND ( $5 IS NULL OR NOT(type IN ($5)) )" +
+	" ORDER BY id ASC LIMIT $6"
+
+const selectMaxAccountDataIDSQL = "" +
+	"SELECT MAX(id) FROM syncapi_account_data_type"
+
+type accountDataStatements struct {
+	streamIDStatements           *streamIDStatements
+	insertAccountDataStmt        *sql.Stmt
+	selectAccountDataInRangeStmt *sql.Stmt
+	selectMaxAccountDataIDStmt   *sql.Stmt
+}
+
+func (s *accountDataStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
+	s.streamIDStatements = streamID
+	_, err = db.Exec(accountDataSchema)
+	if err != nil {
+		return
+	}
+	if s.insertAccountDataStmt, err = db.Prepare(insertAccountDataSQL); err != nil {
+		return
+	}
+	if s.selectAccountDataInRangeStmt, err = db.Prepare(selectAccountDataInRangeSQL); err != nil {
+		return
+	}
+	if s.selectMaxAccountDataIDStmt, err = db.Prepare(selectMaxAccountDataIDSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *accountDataStatements) insertAccountData(
+	ctx context.Context, txn *sql.Tx,
+	userID, roomID, dataType string,
+) (pos types.StreamPosition, err error) {
+	pos, err = s.streamIDStatements.nextStreamID(ctx, txn)
+	if err != nil {
+		return
+	}
+	insertStmt := common.TxStmt(txn, s.insertAccountDataStmt)
+	_, err = insertStmt.ExecContext(ctx, pos, userID, roomID, dataType)
+	return
+}
+
+func (s *accountDataStatements) selectAccountDataInRange(
+	ctx context.Context,
+	userID string,
+	oldPos, newPos types.StreamPosition,
+	accountDataFilterPart *gomatrixserverlib.EventFilter,
+) (data map[string][]string, err error) {
+	data = make(map[string][]string)
+
+	// If both positions are the same, it means that the data was saved after the
+	// latest room event. In that case, we need to decrement the old position as
+	// it would prevent the SQL request from returning anything.
+	if oldPos == newPos {
+		oldPos--
+	}
+
+	rows, err := s.selectAccountDataInRangeStmt.QueryContext(ctx, userID, oldPos, newPos,
+		pq.StringArray(filterConvertTypeWildcardToSQL(accountDataFilterPart.Types)),
+		pq.StringArray(filterConvertTypeWildcardToSQL(accountDataFilterPart.NotTypes)),
+		accountDataFilterPart.Limit,
+	)
+	if err != nil {
+		return
+	}
+
+	for rows.Next() {
+		var dataType string
+		var roomID string
+
+		if err = rows.Scan(&roomID, &dataType); err != nil {
+			return
+		}
+
+		if len(data[roomID]) > 0 {
+			data[roomID] = append(data[roomID], dataType)
+		} else {
+			data[roomID] = []string{dataType}
+		}
+	}
+
+	return
+}
+
+func (s *accountDataStatements) selectMaxAccountDataID(
+	ctx context.Context, txn *sql.Tx,
+) (id int64, err error) {
+	var nullableID sql.NullInt64
+	stmt := common.TxStmt(txn, s.selectMaxAccountDataIDStmt)
+	err = stmt.QueryRowContext(ctx).Scan(&nullableID)
+	if nullableID.Valid {
+		id = nullableID.Int64
+	}
+	return
+}
diff --git a/syncapi/storage/sqlite3/backward_extremities_table.go b/syncapi/storage/sqlite3/backward_extremities_table.go
new file mode 100644
index 00000000..fcf15da2
--- /dev/null
+++ b/syncapi/storage/sqlite3/backward_extremities_table.go
@@ -0,0 +1,124 @@
+// Copyright 2018 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+)
+
+const backwardExtremitiesSchema = `
+-- Stores output room events received from the roomserver.
+CREATE TABLE IF NOT EXISTS syncapi_backward_extremities (
+	room_id TEXT NOT NULL,
+	event_id TEXT NOT NULL,
+
+	PRIMARY KEY(room_id, event_id)
+);
+`
+
+const insertBackwardExtremitySQL = "" +
+	"INSERT INTO syncapi_backward_extremities (room_id, event_id)" +
+	" VALUES ($1, $2)" +
+	" ON CONFLICT (room_id, event_id) DO NOTHING"
+
+const selectBackwardExtremitiesForRoomSQL = "" +
+	"SELECT event_id FROM syncapi_backward_extremities WHERE room_id = $1"
+
+const isBackwardExtremitySQL = "" +
+	"SELECT EXISTS (" +
+	" SELECT TRUE FROM syncapi_backward_extremities" +
+	" WHERE room_id = $1 AND event_id = $2" +
+	")"
+
+const deleteBackwardExtremitySQL = "" +
+	"DELETE FROM syncapi_backward_extremities" +
+	" WHERE room_id = $1 AND event_id = $2"
+
+type backwardExtremitiesStatements struct {
+	insertBackwardExtremityStmt          *sql.Stmt
+	selectBackwardExtremitiesForRoomStmt *sql.Stmt
+	isBackwardExtremityStmt              *sql.Stmt
+	deleteBackwardExtremityStmt          *sql.Stmt
+}
+
+func (s *backwardExtremitiesStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(backwardExtremitiesSchema)
+	if err != nil {
+		return
+	}
+	if s.insertBackwardExtremityStmt, err = db.Prepare(insertBackwardExtremitySQL); err != nil {
+		return
+	}
+	if s.selectBackwardExtremitiesForRoomStmt, err = db.Prepare(selectBackwardExtremitiesForRoomSQL); err != nil {
+		return
+	}
+	if s.isBackwardExtremityStmt, err = db.Prepare(isBackwardExtremitySQL); err != nil {
+		return
+	}
+	if s.deleteBackwardExtremityStmt, err = db.Prepare(deleteBackwardExtremitySQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *backwardExtremitiesStatements) insertsBackwardExtremity(
+	ctx context.Context, txn *sql.Tx, roomID, eventID string,
+) (err error) {
+	stmt := common.TxStmt(txn, s.insertBackwardExtremityStmt)
+	_, err = stmt.ExecContext(ctx, roomID, eventID)
+	return
+}
+
+func (s *backwardExtremitiesStatements) selectBackwardExtremitiesForRoom(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (eventIDs []string, err error) {
+	eventIDs = make([]string, 0)
+
+	stmt := common.TxStmt(txn, s.selectBackwardExtremitiesForRoomStmt)
+	rows, err := stmt.QueryContext(ctx, roomID)
+	if err != nil {
+		return
+	}
+
+	for rows.Next() {
+		var eID string
+		if err = rows.Scan(&eID); err != nil {
+			return
+		}
+
+		eventIDs = append(eventIDs, eID)
+	}
+
+	return
+}
+
+func (s *backwardExtremitiesStatements) isBackwardExtremity(
+	ctx context.Context, txn *sql.Tx, roomID, eventID string,
+) (isBE bool, err error) {
+	stmt := common.TxStmt(txn, s.isBackwardExtremityStmt)
+	err = stmt.QueryRowContext(ctx, roomID, eventID).Scan(&isBE)
+	return
+}
+
+func (s *backwardExtremitiesStatements) deleteBackwardExtremity(
+	ctx context.Context, txn *sql.Tx, roomID, eventID string,
+) (err error) {
+	stmt := common.TxStmt(txn, s.deleteBackwardExtremityStmt)
+	_, err = stmt.ExecContext(ctx, roomID, eventID)
+	return
+}
diff --git a/syncapi/storage/sqlite3/current_room_state_table.go b/syncapi/storage/sqlite3/current_room_state_table.go
new file mode 100644
index 00000000..4ce94666
--- /dev/null
+++ b/syncapi/storage/sqlite3/current_room_state_table.go
@@ -0,0 +1,276 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const currentRoomStateSchema = `
+-- Stores the current room state for every room.
+CREATE TABLE IF NOT EXISTS syncapi_current_room_state (
+    room_id TEXT NOT NULL,
+    event_id TEXT NOT NULL,
+    type TEXT NOT NULL,
+    sender TEXT NOT NULL,
+    contains_url BOOL NOT NULL DEFAULT false,
+    state_key TEXT NOT NULL,
+    event_json TEXT NOT NULL,
+    membership TEXT,
+    added_at BIGINT,
+    UNIQUE (room_id, type, state_key)
+);
+-- for event deletion
+CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_id_idx ON syncapi_current_room_state(event_id, room_id, type, sender, contains_url);
+-- for querying membership states of users
+-- CREATE INDEX IF NOT EXISTS syncapi_membership_idx ON syncapi_current_room_state(type, state_key, membership) WHERE membership IS NOT NULL AND membership != 'leave';
+`
+
+const upsertRoomStateSQL = "" +
+	"INSERT INTO syncapi_current_room_state (room_id, event_id, type, sender, contains_url, state_key, event_json, membership, added_at)" +
+	" VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)" +
+	" ON CONFLICT (event_id, room_id, type, sender, contains_url)" +
+	" DO UPDATE SET event_id = $2, sender=$4, contains_url=$5, event_json = $7, membership = $8, added_at = $9"
+
+const deleteRoomStateByEventIDSQL = "" +
+	"DELETE FROM syncapi_current_room_state WHERE event_id = $1"
+
+const selectRoomIDsWithMembershipSQL = "" +
+	"SELECT room_id FROM syncapi_current_room_state WHERE type = 'm.room.member' AND state_key = $1 AND membership = $2"
+
+const selectCurrentStateSQL = "" +
+	"SELECT event_json FROM syncapi_current_room_state WHERE room_id = $1" +
+	" AND ( $2 IS NULL OR     sender IN ($2)  )" +
+	" AND ( $3 IS NULL OR NOT(sender IN ($3)) )" +
+	" AND ( $4 IS NULL OR     type   IN ($4)  )" +
+	" AND ( $5 IS NULL OR NOT(type   IN ($5)) )" +
+	" AND ( $6 IS NULL OR     contains_url = $6  )" +
+	" LIMIT $7"
+
+const selectJoinedUsersSQL = "" +
+	"SELECT room_id, state_key FROM syncapi_current_room_state WHERE type = 'm.room.member' AND membership = 'join'"
+
+const selectStateEventSQL = "" +
+	"SELECT event_json FROM syncapi_current_room_state WHERE room_id = $1 AND type = $2 AND state_key = $3"
+
+const selectEventsWithEventIDsSQL = "" +
+	// TODO: The session_id and transaction_id blanks are here because otherwise
+	// the rowsToStreamEvents expects there to be exactly five columns. We need to
+	// figure out if these really need to be in the DB, and if so, we need a
+	// better permanent fix for this. - neilalexander, 2 Jan 2020
+	"SELECT added_at, event_json, 0 AS session_id, false AS exclude_from_sync, '' AS transaction_id" +
+	" FROM syncapi_current_room_state WHERE event_id IN ($1)"
+
+type currentRoomStateStatements struct {
+	streamIDStatements              *streamIDStatements
+	upsertRoomStateStmt             *sql.Stmt
+	deleteRoomStateByEventIDStmt    *sql.Stmt
+	selectRoomIDsWithMembershipStmt *sql.Stmt
+	selectCurrentStateStmt          *sql.Stmt
+	selectJoinedUsersStmt           *sql.Stmt
+	selectEventsWithEventIDsStmt    *sql.Stmt
+	selectStateEventStmt            *sql.Stmt
+}
+
+func (s *currentRoomStateStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
+	s.streamIDStatements = streamID
+	_, err = db.Exec(currentRoomStateSchema)
+	if err != nil {
+		return
+	}
+	if s.upsertRoomStateStmt, err = db.Prepare(upsertRoomStateSQL); err != nil {
+		return
+	}
+	if s.deleteRoomStateByEventIDStmt, err = db.Prepare(deleteRoomStateByEventIDSQL); err != nil {
+		return
+	}
+	if s.selectRoomIDsWithMembershipStmt, err = db.Prepare(selectRoomIDsWithMembershipSQL); err != nil {
+		return
+	}
+	if s.selectCurrentStateStmt, err = db.Prepare(selectCurrentStateSQL); err != nil {
+		return
+	}
+	if s.selectJoinedUsersStmt, err = db.Prepare(selectJoinedUsersSQL); err != nil {
+		return
+	}
+	if s.selectEventsWithEventIDsStmt, err = db.Prepare(selectEventsWithEventIDsSQL); err != nil {
+		return
+	}
+	if s.selectStateEventStmt, err = db.Prepare(selectStateEventSQL); err != nil {
+		return
+	}
+	return
+}
+
+// JoinedMemberLists returns a map of room ID to a list of joined user IDs.
+func (s *currentRoomStateStatements) selectJoinedUsers(
+	ctx context.Context,
+) (map[string][]string, error) {
+	rows, err := s.selectJoinedUsersStmt.QueryContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	result := make(map[string][]string)
+	for rows.Next() {
+		var roomID string
+		var userID string
+		if err := rows.Scan(&roomID, &userID); err != nil {
+			return nil, err
+		}
+		users := result[roomID]
+		users = append(users, userID)
+		result[roomID] = users
+	}
+	return result, nil
+}
+
+// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
+func (s *currentRoomStateStatements) selectRoomIDsWithMembership(
+	ctx context.Context,
+	txn *sql.Tx,
+	userID string,
+	membership string, // nolint: unparam
+) ([]string, error) {
+	stmt := common.TxStmt(txn, s.selectRoomIDsWithMembershipStmt)
+	rows, err := stmt.QueryContext(ctx, userID, membership)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	var result []string
+	for rows.Next() {
+		var roomID string
+		if err := rows.Scan(&roomID); err != nil {
+			return nil, err
+		}
+		result = append(result, roomID)
+	}
+	return result, nil
+}
+
+// CurrentState returns all the current state events for the given room.
+func (s *currentRoomStateStatements) selectCurrentState(
+	ctx context.Context, txn *sql.Tx, roomID string,
+	stateFilterPart *gomatrixserverlib.StateFilter,
+) ([]gomatrixserverlib.Event, error) {
+	stmt := common.TxStmt(txn, s.selectCurrentStateStmt)
+	rows, err := stmt.QueryContext(ctx, roomID,
+		pq.StringArray(stateFilterPart.Senders),
+		pq.StringArray(stateFilterPart.NotSenders),
+		pq.StringArray(filterConvertTypeWildcardToSQL(stateFilterPart.Types)),
+		pq.StringArray(filterConvertTypeWildcardToSQL(stateFilterPart.NotTypes)),
+		stateFilterPart.ContainsURL,
+		stateFilterPart.Limit,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	return rowsToEvents(rows)
+}
+
+func (s *currentRoomStateStatements) deleteRoomStateByEventID(
+	ctx context.Context, txn *sql.Tx, eventID string,
+) error {
+	stmt := common.TxStmt(txn, s.deleteRoomStateByEventIDStmt)
+	_, err := stmt.ExecContext(ctx, eventID)
+	return err
+}
+
+func (s *currentRoomStateStatements) upsertRoomState(
+	ctx context.Context, txn *sql.Tx,
+	event gomatrixserverlib.Event, membership *string, addedAt types.StreamPosition,
+) error {
+	// Parse content as JSON and search for an "url" key
+	containsURL := false
+	var content map[string]interface{}
+	if json.Unmarshal(event.Content(), &content) != nil {
+		// Set containsURL to true if url is present
+		_, containsURL = content["url"]
+	}
+
+	// upsert state event
+	stmt := common.TxStmt(txn, s.upsertRoomStateStmt)
+	_, err := stmt.ExecContext(
+		ctx,
+		event.RoomID(),
+		event.EventID(),
+		event.Type(),
+		event.Sender(),
+		containsURL,
+		*event.StateKey(),
+		event.JSON(),
+		membership,
+		addedAt,
+	)
+	return err
+}
+
+func (s *currentRoomStateStatements) selectEventsWithEventIDs(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]types.StreamEvent, error) {
+	stmt := common.TxStmt(txn, s.selectEventsWithEventIDsStmt)
+	rows, err := stmt.QueryContext(ctx, pq.StringArray(eventIDs))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	return rowsToStreamEvents(rows)
+}
+
+func rowsToEvents(rows *sql.Rows) ([]gomatrixserverlib.Event, error) {
+	result := []gomatrixserverlib.Event{}
+	for rows.Next() {
+		var eventBytes []byte
+		if err := rows.Scan(&eventBytes); err != nil {
+			return nil, err
+		}
+		// TODO: Handle redacted events
+		ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
+		if err != nil {
+			return nil, err
+		}
+		result = append(result, ev)
+	}
+	return result, nil
+}
+
+func (s *currentRoomStateStatements) selectStateEvent(
+	ctx context.Context, roomID, evType, stateKey string,
+) (*gomatrixserverlib.Event, error) {
+	stmt := s.selectStateEventStmt
+	var res []byte
+	err := stmt.QueryRowContext(ctx, roomID, evType, stateKey).Scan(&res)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	ev, err := gomatrixserverlib.NewEventFromTrustedJSON(res, false)
+	return &ev, err
+}
diff --git a/syncapi/storage/sqlite3/filtering.go b/syncapi/storage/sqlite3/filtering.go
new file mode 100644
index 00000000..c4a2f4bf
--- /dev/null
+++ b/syncapi/storage/sqlite3/filtering.go
@@ -0,0 +1,36 @@
+// Copyright 2017 Thibaut CHARLES
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"strings"
+)
+
+// filterConvertWildcardToSQL converts wildcards as defined in
+// https://matrix.org/docs/spec/client_server/r0.3.0.html#post-matrix-client-r0-user-userid-filter
+// to SQL wildcards that can be used with LIKE()
+func filterConvertTypeWildcardToSQL(values []string) []string {
+	if values == nil {
+		// Return nil instead of []string{} so IS NULL can work correctly when
+		// the return value is passed into SQL queries
+		return nil
+	}
+
+	ret := make([]string, len(values))
+	for i := range values {
+		ret[i] = strings.Replace(values[i], "*", "%", -1)
+	}
+	return ret
+}
diff --git a/syncapi/storage/sqlite3/invites_table.go b/syncapi/storage/sqlite3/invites_table.go
new file mode 100644
index 00000000..74dba245
--- /dev/null
+++ b/syncapi/storage/sqlite3/invites_table.go
@@ -0,0 +1,157 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const inviteEventsSchema = `
+CREATE TABLE IF NOT EXISTS syncapi_invite_events (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	event_id TEXT NOT NULL,
+	room_id TEXT NOT NULL,
+	target_user_id TEXT NOT NULL,
+	event_json TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS syncapi_invites_target_user_id_idx ON syncapi_invite_events (target_user_id, id);
+CREATE INDEX IF NOT EXISTS syncapi_invites_event_id_idx ON syncapi_invite_events (event_id);
+`
+
+const insertInviteEventSQL = "" +
+	"INSERT INTO syncapi_invite_events" +
+	" (room_id, event_id, target_user_id, event_json)" +
+	" VALUES ($1, $2, $3, $4)"
+
+const selectLastInsertedInviteEventSQL = "" +
+	"SELECT id FROM syncapi_invite_events WHERE rowid = last_insert_rowid()"
+
+const deleteInviteEventSQL = "" +
+	"DELETE FROM syncapi_invite_events WHERE event_id = $1"
+
+const selectInviteEventsInRangeSQL = "" +
+	"SELECT room_id, event_json FROM syncapi_invite_events" +
+	" WHERE target_user_id = $1 AND id > $2 AND id <= $3" +
+	" ORDER BY id DESC"
+
+const selectMaxInviteIDSQL = "" +
+	"SELECT MAX(id) FROM syncapi_invite_events"
+
+type inviteEventsStatements struct {
+	streamIDStatements                *streamIDStatements
+	insertInviteEventStmt             *sql.Stmt
+	selectLastInsertedInviteEventStmt *sql.Stmt
+	selectInviteEventsInRangeStmt     *sql.Stmt
+	deleteInviteEventStmt             *sql.Stmt
+	selectMaxInviteIDStmt             *sql.Stmt
+}
+
+func (s *inviteEventsStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
+	s.streamIDStatements = streamID
+	_, err = db.Exec(inviteEventsSchema)
+	if err != nil {
+		return
+	}
+	if s.insertInviteEventStmt, err = db.Prepare(insertInviteEventSQL); err != nil {
+		return
+	}
+	if s.selectLastInsertedInviteEventStmt, err = db.Prepare(selectLastInsertedInviteEventSQL); err != nil {
+		return
+	}
+	if s.selectInviteEventsInRangeStmt, err = db.Prepare(selectInviteEventsInRangeSQL); err != nil {
+		return
+	}
+	if s.deleteInviteEventStmt, err = db.Prepare(deleteInviteEventSQL); err != nil {
+		return
+	}
+	if s.selectMaxInviteIDStmt, err = db.Prepare(selectMaxInviteIDSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *inviteEventsStatements) insertInviteEvent(
+	ctx context.Context, inviteEvent gomatrixserverlib.Event,
+) (streamPos types.StreamPosition, err error) {
+	_, err = s.insertInviteEventStmt.ExecContext(
+		ctx,
+		inviteEvent.RoomID(),
+		inviteEvent.EventID(),
+		*inviteEvent.StateKey(),
+		inviteEvent.JSON(),
+	)
+	if err != nil {
+		return
+	}
+	err = s.selectLastInsertedInviteEventStmt.QueryRowContext(ctx).Scan(&streamPos)
+	return
+}
+
+func (s *inviteEventsStatements) deleteInviteEvent(
+	ctx context.Context, inviteEventID string,
+) error {
+	_, err := s.deleteInviteEventStmt.ExecContext(ctx, inviteEventID)
+	return err
+}
+
+// selectInviteEventsInRange returns a map of room ID to invite event for the
+// active invites for the target user ID in the supplied range.
+func (s *inviteEventsStatements) selectInviteEventsInRange(
+	ctx context.Context, txn *sql.Tx, targetUserID string, startPos, endPos types.StreamPosition,
+) (map[string]gomatrixserverlib.Event, error) {
+	stmt := common.TxStmt(txn, s.selectInviteEventsInRangeStmt)
+	rows, err := stmt.QueryContext(ctx, targetUserID, startPos, endPos)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	result := map[string]gomatrixserverlib.Event{}
+	for rows.Next() {
+		var (
+			roomID    string
+			eventJSON []byte
+		)
+		if err = rows.Scan(&roomID, &eventJSON); err != nil {
+			return nil, err
+		}
+
+		event, err := gomatrixserverlib.NewEventFromTrustedJSON(eventJSON, false)
+		if err != nil {
+			return nil, err
+		}
+
+		result[roomID] = event
+	}
+	return result, nil
+}
+
+func (s *inviteEventsStatements) selectMaxInviteID(
+	ctx context.Context, txn *sql.Tx,
+) (id int64, err error) {
+	var nullableID sql.NullInt64
+	stmt := common.TxStmt(txn, s.selectMaxInviteIDStmt)
+	err = stmt.QueryRowContext(ctx).Scan(&nullableID)
+	if nullableID.Valid {
+		id = nullableID.Int64
+	}
+	return
+}
diff --git a/syncapi/storage/sqlite3/output_room_events_table.go b/syncapi/storage/sqlite3/output_room_events_table.go
new file mode 100644
index 00000000..8c01f2ce
--- /dev/null
+++ b/syncapi/storage/sqlite3/output_room_events_table.go
@@ -0,0 +1,411 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"sort"
+
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/syncapi/types"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/gomatrixserverlib"
+	log "github.com/sirupsen/logrus"
+)
+
+const outputRoomEventsSchema = `
+-- Stores output room events received from the roomserver.
+CREATE TABLE IF NOT EXISTS syncapi_output_room_events (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  event_id TEXT NOT NULL UNIQUE,
+  room_id TEXT NOT NULL,
+  event_json TEXT NOT NULL,
+  type TEXT NOT NULL,
+  sender TEXT NOT NULL,
+  contains_url BOOL NOT NULL,
+  add_state_ids TEXT[],
+  remove_state_ids TEXT[],
+  session_id BIGINT,
+  transaction_id TEXT,
+  exclude_from_sync BOOL DEFAULT FALSE
+);
+`
+
+const insertEventSQL = "" +
+	"INSERT INTO syncapi_output_room_events (" +
+	"id, room_id, event_id, event_json, type, sender, contains_url, add_state_ids, remove_state_ids, session_id, transaction_id, exclude_from_sync" +
+	") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) " +
+	"ON CONFLICT (event_id) DO UPDATE SET exclude_from_sync = $11"
+
+const selectLastInsertedEventSQL = "" +
+	"SELECT id FROM syncapi_output_room_events WHERE rowid = last_insert_rowid()"
+
+const selectEventsSQL = "" +
+	"SELECT id, event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events WHERE event_id = $1"
+
+const selectRecentEventsSQL = "" +
+	"SELECT id, event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events" +
+	" WHERE room_id = $1 AND id > $2 AND id <= $3" +
+	" ORDER BY id DESC LIMIT $4"
+
+const selectRecentEventsForSyncSQL = "" +
+	"SELECT id, event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events" +
+	" WHERE room_id = $1 AND id > $2 AND id <= $3 AND exclude_from_sync = FALSE" +
+	" ORDER BY id DESC LIMIT $4"
+
+const selectEarlyEventsSQL = "" +
+	"SELECT id, event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events" +
+	" WHERE room_id = $1 AND id > $2 AND id <= $3" +
+	" ORDER BY id ASC LIMIT $4"
+
+const selectMaxEventIDSQL = "" +
+	"SELECT MAX(id) FROM syncapi_output_room_events"
+
+// In order for us to apply the state updates correctly, rows need to be ordered in the order they were received (id).
+/*
+	$1 = oldPos,
+	$2 = newPos,
+	$3 = pq.StringArray(stateFilterPart.Senders),
+	$4 = pq.StringArray(stateFilterPart.NotSenders),
+	$5 = pq.StringArray(filterConvertTypeWildcardToSQL(stateFilterPart.Types)),
+	$6 = pq.StringArray(filterConvertTypeWildcardToSQL(stateFilterPart.NotTypes)),
+	$7 = stateFilterPart.ContainsURL,
+	$8 = stateFilterPart.Limit,
+*/
+const selectStateInRangeSQL = "" +
+	"SELECT id, event_json, exclude_from_sync, add_state_ids, remove_state_ids" +
+	" FROM syncapi_output_room_events" +
+	" WHERE (id > $1 AND id <= $2)" + // old/new pos
+	" AND (add_state_ids IS NOT NULL OR remove_state_ids IS NOT NULL)" +
+	/*	" AND ( $3 IS NULL OR     sender  IN ($3)  )" + // sender
+		" AND ( $4 IS NULL OR NOT(sender  IN ($4)) )" + // not sender
+		" AND ( $5 IS NULL OR     type    IN ($5)  )" + // type
+		" AND ( $6 IS NULL OR NOT(type    IN ($6)) )" + // not type
+		" AND ( $7 IS NULL OR     contains_url = $7)" + // contains URL? */
+	" ORDER BY id ASC" +
+	" LIMIT $8" // limit
+
+type outputRoomEventsStatements struct {
+	streamIDStatements            *streamIDStatements
+	insertEventStmt               *sql.Stmt
+	selectLastInsertedEventStmt   *sql.Stmt
+	selectEventsStmt              *sql.Stmt
+	selectMaxEventIDStmt          *sql.Stmt
+	selectRecentEventsStmt        *sql.Stmt
+	selectRecentEventsForSyncStmt *sql.Stmt
+	selectEarlyEventsStmt         *sql.Stmt
+	selectStateInRangeStmt        *sql.Stmt
+}
+
+func (s *outputRoomEventsStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
+	s.streamIDStatements = streamID
+	_, err = db.Exec(outputRoomEventsSchema)
+	if err != nil {
+		return
+	}
+	if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
+		return
+	}
+	if s.selectLastInsertedEventStmt, err = db.Prepare(selectLastInsertedEventSQL); err != nil {
+		return
+	}
+	if s.selectEventsStmt, err = db.Prepare(selectEventsSQL); err != nil {
+		return
+	}
+	if s.selectMaxEventIDStmt, err = db.Prepare(selectMaxEventIDSQL); err != nil {
+		return
+	}
+	if s.selectRecentEventsStmt, err = db.Prepare(selectRecentEventsSQL); err != nil {
+		return
+	}
+	if s.selectRecentEventsForSyncStmt, err = db.Prepare(selectRecentEventsForSyncSQL); err != nil {
+		return
+	}
+	if s.selectEarlyEventsStmt, err = db.Prepare(selectEarlyEventsSQL); err != nil {
+		return
+	}
+	if s.selectStateInRangeStmt, err = db.Prepare(selectStateInRangeSQL); err != nil {
+		return
+	}
+	return
+}
+
+// selectStateInRange returns the state events between the two given PDU stream positions, exclusive of oldPos, inclusive of newPos.
+// Results are bucketed based on the room ID. If the same state is overwritten multiple times between the
+// two positions, only the most recent state is returned.
+func (s *outputRoomEventsStatements) selectStateInRange(
+	ctx context.Context, txn *sql.Tx, oldPos, newPos types.StreamPosition,
+	stateFilterPart *gomatrixserverlib.StateFilter,
+) (map[string]map[string]bool, map[string]types.StreamEvent, error) {
+	stmt := common.TxStmt(txn, s.selectStateInRangeStmt)
+
+	rows, err := stmt.QueryContext(
+		ctx, oldPos, newPos,
+		/*pq.StringArray(stateFilterPart.Senders),
+		pq.StringArray(stateFilterPart.NotSenders),
+		pq.StringArray(filterConvertTypeWildcardToSQL(stateFilterPart.Types)),
+		pq.StringArray(filterConvertTypeWildcardToSQL(stateFilterPart.NotTypes)),
+		stateFilterPart.ContainsURL,*/
+		stateFilterPart.Limit,
+	)
+	if err != nil {
+		return nil, nil, err
+	}
+	// Fetch all the state change events for all rooms between the two positions then loop each event and:
+	//  - Keep a cache of the event by ID (99% of state change events are for the event itself)
+	//  - For each room ID, build up an array of event IDs which represents cumulative adds/removes
+	// For each room, map cumulative event IDs to events and return. This may need to a batch SELECT based on event ID
+	// if they aren't in the event ID cache. We don't handle state deletion yet.
+	eventIDToEvent := make(map[string]types.StreamEvent)
+
+	// RoomID => A set (map[string]bool) of state event IDs which are between the two positions
+	stateNeeded := make(map[string]map[string]bool)
+
+	for rows.Next() {
+		var (
+			streamPos       types.StreamPosition
+			eventBytes      []byte
+			excludeFromSync bool
+			addIDs          pq.StringArray
+			delIDs          pq.StringArray
+		)
+		if err := rows.Scan(&streamPos, &eventBytes, &excludeFromSync, &addIDs, &delIDs); err != nil {
+			return nil, nil, err
+		}
+		// Sanity check for deleted state and whine if we see it. We don't need to do anything
+		// since it'll just mark the event as not being needed.
+		if len(addIDs) < len(delIDs) {
+			log.WithFields(log.Fields{
+				"since":   oldPos,
+				"current": newPos,
+				"adds":    addIDs,
+				"dels":    delIDs,
+			}).Warn("StateBetween: ignoring deleted state")
+		}
+
+		// TODO: Handle redacted events
+		ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
+		if err != nil {
+			return nil, nil, err
+		}
+		needSet := stateNeeded[ev.RoomID()]
+		if needSet == nil { // make set if required
+			needSet = make(map[string]bool)
+		}
+		for _, id := range delIDs {
+			needSet[id] = false
+		}
+		for _, id := range addIDs {
+			needSet[id] = true
+		}
+		stateNeeded[ev.RoomID()] = needSet
+
+		eventIDToEvent[ev.EventID()] = types.StreamEvent{
+			Event:           ev,
+			StreamPosition:  streamPos,
+			ExcludeFromSync: excludeFromSync,
+		}
+	}
+
+	return stateNeeded, eventIDToEvent, nil
+}
+
+// MaxID returns the ID of the last inserted event in this table. 'txn' is optional. If it is not supplied,
+// then this function should only ever be used at startup, as it will race with inserting events if it is
+// done afterwards. If there are no inserted events, 0 is returned.
+func (s *outputRoomEventsStatements) selectMaxEventID(
+	ctx context.Context, txn *sql.Tx,
+) (id int64, err error) {
+	var nullableID sql.NullInt64
+	stmt := common.TxStmt(txn, s.selectMaxEventIDStmt)
+	err = stmt.QueryRowContext(ctx).Scan(&nullableID)
+	if nullableID.Valid {
+		id = nullableID.Int64
+	}
+	return
+}
+
+// InsertEvent into the output_room_events table. addState and removeState are an optional list of state event IDs. Returns the position
+// of the inserted event.
+func (s *outputRoomEventsStatements) insertEvent(
+	ctx context.Context, txn *sql.Tx,
+	event *gomatrixserverlib.Event, addState, removeState []string,
+	transactionID *api.TransactionID, excludeFromSync bool,
+) (streamPos types.StreamPosition, err error) {
+	var txnID *string
+	var sessionID *int64
+	if transactionID != nil {
+		sessionID = &transactionID.SessionID
+		txnID = &transactionID.TransactionID
+	}
+
+	// Parse content as JSON and search for an "url" key
+	containsURL := false
+	var content map[string]interface{}
+	if json.Unmarshal(event.Content(), &content) != nil {
+		// Set containsURL to true if url is present
+		_, containsURL = content["url"]
+	}
+
+	streamPos, err = s.streamIDStatements.nextStreamID(ctx, txn)
+	if err != nil {
+		return
+	}
+
+	insertStmt := common.TxStmt(txn, s.insertEventStmt)
+	selectStmt := common.TxStmt(txn, s.selectLastInsertedEventStmt)
+	_, err = insertStmt.ExecContext(
+		ctx,
+		streamPos,
+		event.RoomID(),
+		event.EventID(),
+		event.JSON(),
+		event.Type(),
+		event.Sender(),
+		containsURL,
+		pq.StringArray(addState),
+		pq.StringArray(removeState),
+		sessionID,
+		txnID,
+		excludeFromSync,
+	)
+	if err != nil {
+		return
+	}
+	err = selectStmt.QueryRowContext(ctx).Scan(&streamPos)
+	return
+}
+
+// selectRecentEvents returns the most recent events in the given room, up to a maximum of 'limit'.
+// If onlySyncEvents has a value of true, only returns the events that aren't marked as to exclude
+// from sync.
+func (s *outputRoomEventsStatements) selectRecentEvents(
+	ctx context.Context, txn *sql.Tx,
+	roomID string, fromPos, toPos types.StreamPosition, limit int,
+	chronologicalOrder bool, onlySyncEvents bool,
+) ([]types.StreamEvent, error) {
+	var stmt *sql.Stmt
+	if onlySyncEvents {
+		stmt = common.TxStmt(txn, s.selectRecentEventsForSyncStmt)
+	} else {
+		stmt = common.TxStmt(txn, s.selectRecentEventsStmt)
+	}
+
+	rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	events, err := rowsToStreamEvents(rows)
+	if err != nil {
+		return nil, err
+	}
+	if chronologicalOrder {
+		// The events need to be returned from oldest to latest, which isn't
+		// necessary the way the SQL query returns them, so a sort is necessary to
+		// ensure the events are in the right order in the slice.
+		sort.SliceStable(events, func(i int, j int) bool {
+			return events[i].StreamPosition < events[j].StreamPosition
+		})
+	}
+	return events, nil
+}
+
+// selectEarlyEvents returns the earliest events in the given room, starting
+// from a given position, up to a maximum of 'limit'.
+func (s *outputRoomEventsStatements) selectEarlyEvents(
+	ctx context.Context, txn *sql.Tx,
+	roomID string, fromPos, toPos types.StreamPosition, limit int,
+) ([]types.StreamEvent, error) {
+	stmt := common.TxStmt(txn, s.selectEarlyEventsStmt)
+	rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	events, err := rowsToStreamEvents(rows)
+	if err != nil {
+		return nil, err
+	}
+	// The events need to be returned from oldest to latest, which isn't
+	// necessarily the way the SQL query returns them, so a sort is necessary to
+	// ensure the events are in the right order in the slice.
+	sort.SliceStable(events, func(i int, j int) bool {
+		return events[i].StreamPosition < events[j].StreamPosition
+	})
+	return events, nil
+}
+
+// selectEvents returns the events for the given event IDs. If an event is
+// missing from the database, it will be omitted.
+func (s *outputRoomEventsStatements) selectEvents(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]types.StreamEvent, error) {
+	var returnEvents []types.StreamEvent
+	stmt := common.TxStmt(txn, s.selectEventsStmt)
+	for _, eventID := range eventIDs {
+		rows, err := stmt.QueryContext(ctx, eventID)
+		if err != nil {
+			return nil, err
+		}
+		if streamEvents, err := rowsToStreamEvents(rows); err == nil {
+			returnEvents = append(returnEvents, streamEvents...)
+		}
+		rows.Close() // nolint: errcheck
+	}
+	return returnEvents, nil
+}
+
+func rowsToStreamEvents(rows *sql.Rows) ([]types.StreamEvent, error) {
+	var result []types.StreamEvent
+	for rows.Next() {
+		var (
+			streamPos       types.StreamPosition
+			eventBytes      []byte
+			excludeFromSync bool
+			sessionID       *int64
+			txnID           *string
+			transactionID   *api.TransactionID
+		)
+		if err := rows.Scan(&streamPos, &eventBytes, &sessionID, &excludeFromSync, &txnID); err != nil {
+			return nil, err
+		}
+		// TODO: Handle redacted events
+		ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
+		if err != nil {
+			return nil, err
+		}
+
+		if sessionID != nil && txnID != nil {
+			transactionID = &api.TransactionID{
+				SessionID:     *sessionID,
+				TransactionID: *txnID,
+			}
+		}
+
+		result = append(result, types.StreamEvent{
+			Event:           ev,
+			StreamPosition:  streamPos,
+			TransactionID:   transactionID,
+			ExcludeFromSync: excludeFromSync,
+		})
+	}
+	return result, nil
+}
diff --git a/syncapi/storage/sqlite3/output_room_events_topology_table.go b/syncapi/storage/sqlite3/output_room_events_topology_table.go
new file mode 100644
index 00000000..f7075bd6
--- /dev/null
+++ b/syncapi/storage/sqlite3/output_room_events_topology_table.go
@@ -0,0 +1,192 @@
+// Copyright 2018 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const outputRoomEventsTopologySchema = `
+-- Stores output room events received from the roomserver.
+CREATE TABLE IF NOT EXISTS syncapi_output_room_events_topology (
+  event_id TEXT PRIMARY KEY,
+	topological_position BIGINT NOT NULL,
+  room_id TEXT NOT NULL,
+
+	UNIQUE(topological_position, room_id)
+);
+-- The topological order will be used in events selection and ordering
+-- CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON syncapi_output_room_events_topology(topological_position, room_id);
+`
+
+const insertEventInTopologySQL = "" +
+	"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id)" +
+	" VALUES ($1, $2, $3)" +
+	" ON CONFLICT (topological_position, room_id) DO UPDATE SET event_id = $1"
+
+const selectEventIDsInRangeASCSQL = "" +
+	"SELECT event_id FROM syncapi_output_room_events_topology" +
+	" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
+	" ORDER BY topological_position ASC LIMIT $4"
+
+const selectEventIDsInRangeDESCSQL = "" +
+	"SELECT event_id FROM syncapi_output_room_events_topology" +
+	" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
+	" ORDER BY topological_position DESC LIMIT $4"
+
+const selectPositionInTopologySQL = "" +
+	"SELECT topological_position FROM syncapi_output_room_events_topology" +
+	" WHERE event_id = $1"
+
+const selectMaxPositionInTopologySQL = "" +
+	"SELECT MAX(topological_position) FROM syncapi_output_room_events_topology" +
+	" WHERE room_id = $1"
+
+const selectEventIDsFromPositionSQL = "" +
+	"SELECT event_id FROM syncapi_output_room_events_topology" +
+	" WHERE room_id = $1 AND topological_position = $2"
+
+type outputRoomEventsTopologyStatements struct {
+	insertEventInTopologyStmt       *sql.Stmt
+	selectEventIDsInRangeASCStmt    *sql.Stmt
+	selectEventIDsInRangeDESCStmt   *sql.Stmt
+	selectPositionInTopologyStmt    *sql.Stmt
+	selectMaxPositionInTopologyStmt *sql.Stmt
+	selectEventIDsFromPositionStmt  *sql.Stmt
+}
+
+func (s *outputRoomEventsTopologyStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(outputRoomEventsTopologySchema)
+	if err != nil {
+		return
+	}
+	if s.insertEventInTopologyStmt, err = db.Prepare(insertEventInTopologySQL); err != nil {
+		return
+	}
+	if s.selectEventIDsInRangeASCStmt, err = db.Prepare(selectEventIDsInRangeASCSQL); err != nil {
+		return
+	}
+	if s.selectEventIDsInRangeDESCStmt, err = db.Prepare(selectEventIDsInRangeDESCSQL); err != nil {
+		return
+	}
+	if s.selectPositionInTopologyStmt, err = db.Prepare(selectPositionInTopologySQL); err != nil {
+		return
+	}
+	if s.selectMaxPositionInTopologyStmt, err = db.Prepare(selectMaxPositionInTopologySQL); err != nil {
+		return
+	}
+	if s.selectEventIDsFromPositionStmt, err = db.Prepare(selectEventIDsFromPositionSQL); err != nil {
+		return
+	}
+	return
+}
+
+// insertEventInTopology inserts the given event in the room's topology, based
+// on the event's depth.
+func (s *outputRoomEventsTopologyStatements) insertEventInTopology(
+	ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.Event,
+) (err error) {
+	stmt := common.TxStmt(txn, s.insertEventInTopologyStmt)
+	_, err = stmt.ExecContext(
+		ctx, event.EventID(), event.Depth(), event.RoomID(),
+	)
+	return
+}
+
+// selectEventIDsInRange selects the IDs of events which positions are within a
+// given range in a given room's topological order.
+// Returns an empty slice if no events match the given range.
+func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
+	ctx context.Context, txn *sql.Tx, roomID string,
+	fromPos, toPos types.StreamPosition,
+	limit int, chronologicalOrder bool,
+) (eventIDs []string, err error) {
+	// Decide on the selection's order according to whether chronological order
+	// is requested or not.
+	var stmt *sql.Stmt
+	if chronologicalOrder {
+		stmt = common.TxStmt(txn, s.selectEventIDsInRangeASCStmt)
+	} else {
+		stmt = common.TxStmt(txn, s.selectEventIDsInRangeDESCStmt)
+	}
+
+	// Query the event IDs.
+	rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
+	if err == sql.ErrNoRows {
+		// If no event matched the request, return an empty slice.
+		return []string{}, nil
+	} else if err != nil {
+		return
+	}
+
+	// Return the IDs.
+	var eventID string
+	for rows.Next() {
+		if err = rows.Scan(&eventID); err != nil {
+			return
+		}
+		eventIDs = append(eventIDs, eventID)
+	}
+
+	return
+}
+
+// selectPositionInTopology returns the position of a given event in the
+// topology of the room it belongs to.
+func (s *outputRoomEventsTopologyStatements) selectPositionInTopology(
+	ctx context.Context, txn *sql.Tx, eventID string,
+) (pos types.StreamPosition, err error) {
+	stmt := common.TxStmt(txn, s.selectPositionInTopologyStmt)
+	err = stmt.QueryRowContext(ctx, eventID).Scan(&pos)
+	return
+}
+
+func (s *outputRoomEventsTopologyStatements) selectMaxPositionInTopology(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (pos types.StreamPosition, err error) {
+	stmt := common.TxStmt(txn, s.selectMaxPositionInTopologyStmt)
+	err = stmt.QueryRowContext(ctx, roomID).Scan(&pos)
+	return
+}
+
+// selectEventIDsFromPosition returns the IDs of all events that have a given
+// position in the topology of a given room.
+func (s *outputRoomEventsTopologyStatements) selectEventIDsFromPosition(
+	ctx context.Context, txn *sql.Tx, roomID string, pos types.StreamPosition,
+) (eventIDs []string, err error) {
+	// Query the event IDs.
+	stmt := common.TxStmt(txn, s.selectEventIDsFromPositionStmt)
+	rows, err := stmt.QueryContext(ctx, roomID, pos)
+	if err == sql.ErrNoRows {
+		// If no event matched the request, return an empty slice.
+		return []string{}, nil
+	} else if err != nil {
+		return
+	}
+	// Return the IDs.
+	var eventID string
+	for rows.Next() {
+		if err = rows.Scan(&eventID); err != nil {
+			return
+		}
+		eventIDs = append(eventIDs, eventID)
+	}
+	return
+}
diff --git a/syncapi/storage/sqlite3/stream_id_table.go b/syncapi/storage/sqlite3/stream_id_table.go
new file mode 100644
index 00000000..260f7a95
--- /dev/null
+++ b/syncapi/storage/sqlite3/stream_id_table.go
@@ -0,0 +1,58 @@
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/syncapi/types"
+)
+
+const streamIDTableSchema = `
+-- Global stream ID counter, used by other tables.
+CREATE TABLE IF NOT EXISTS syncapi_stream_id (
+  stream_name TEXT NOT NULL PRIMARY KEY,
+  stream_id INT DEFAULT 0,
+
+  UNIQUE(stream_name)
+);
+INSERT INTO syncapi_stream_id (stream_name, stream_id) VALUES ("global", 0)
+  ON CONFLICT DO NOTHING;
+`
+
+const increaseStreamIDStmt = "" +
+	"UPDATE syncapi_stream_id SET stream_id = stream_id + 1 WHERE stream_name = $1"
+
+const selectStreamIDStmt = "" +
+	"SELECT stream_id FROM syncapi_stream_id WHERE stream_name = $1"
+
+type streamIDStatements struct {
+	increaseStreamIDStmt *sql.Stmt
+	selectStreamIDStmt   *sql.Stmt
+}
+
+func (s *streamIDStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(streamIDTableSchema)
+	if err != nil {
+		return
+	}
+	if s.increaseStreamIDStmt, err = db.Prepare(increaseStreamIDStmt); err != nil {
+		return
+	}
+	if s.selectStreamIDStmt, err = db.Prepare(selectStreamIDStmt); err != nil {
+		return
+	}
+	return
+}
+
+func (s *streamIDStatements) nextStreamID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error) {
+	increaseStmt := common.TxStmt(txn, s.increaseStreamIDStmt)
+	selectStmt := common.TxStmt(txn, s.selectStreamIDStmt)
+	if _, err = increaseStmt.ExecContext(ctx, "global"); err != nil {
+		return
+	}
+	if err = selectStmt.QueryRowContext(ctx, "global").Scan(&pos); err != nil {
+		return
+	}
+	return
+}
diff --git a/syncapi/storage/sqlite3/syncserver.go b/syncapi/storage/sqlite3/syncserver.go
new file mode 100644
index 00000000..8cfc1884
--- /dev/null
+++ b/syncapi/storage/sqlite3/syncserver.go
@@ -0,0 +1,1197 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/url"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/roomserver/api"
+
+	// Import the postgres database driver.
+	_ "github.com/lib/pq"
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/dendrite/typingserver/cache"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type stateDelta struct {
+	roomID      string
+	stateEvents []gomatrixserverlib.Event
+	membership  string
+	// The PDU stream position of the latest membership event for this user, if applicable.
+	// Can be 0 if there is no membership event in this delta.
+	membershipPos types.StreamPosition
+}
+
+// SyncServerDatasource represents a sync server datasource which manages
+// both the database for PDUs and caches for EDUs.
+type SyncServerDatasource struct {
+	db *sql.DB
+	common.PartitionOffsetStatements
+	streamID            streamIDStatements
+	accountData         accountDataStatements
+	events              outputRoomEventsStatements
+	roomstate           currentRoomStateStatements
+	invites             inviteEventsStatements
+	typingCache         *cache.TypingCache
+	topology            outputRoomEventsTopologyStatements
+	backwardExtremities backwardExtremitiesStatements
+}
+
+// NewSyncServerDatasource creates a new sync server database
+// nolint: gocyclo
+func NewSyncServerDatasource(dataSourceName string) (*SyncServerDatasource, error) {
+	var d SyncServerDatasource
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	var cs string
+	if uri.Opaque != "" { // file:filename.db
+		cs = uri.Opaque
+	} else if uri.Path != "" { // file:///path/to/filename.db
+		cs = uri.Path
+	} else {
+		return nil, errors.New("no filename or path in connect string")
+	}
+	if d.db, err = sql.Open("sqlite3", cs); err != nil {
+		return nil, err
+	}
+	if err = d.prepare(); err != nil {
+		return nil, err
+	}
+	d.typingCache = cache.NewTypingCache()
+	return &d, nil
+}
+
+func (d *SyncServerDatasource) prepare() (err error) {
+	if err = d.PartitionOffsetStatements.Prepare(d.db, "syncapi"); err != nil {
+		return err
+	}
+	if err = d.streamID.prepare(d.db); err != nil {
+		return err
+	}
+	if err = d.accountData.prepare(d.db, &d.streamID); err != nil {
+		return err
+	}
+	if err = d.events.prepare(d.db, &d.streamID); err != nil {
+		return err
+	}
+	if err := d.roomstate.prepare(d.db, &d.streamID); err != nil {
+		return err
+	}
+	if err := d.invites.prepare(d.db, &d.streamID); err != nil {
+		return err
+	}
+	if err := d.topology.prepare(d.db); err != nil {
+		return err
+	}
+	if err := d.backwardExtremities.prepare(d.db); err != nil {
+		return err
+	}
+	return nil
+}
+
+// AllJoinedUsersInRooms returns a map of room ID to a list of all joined user IDs.
+func (d *SyncServerDatasource) AllJoinedUsersInRooms(ctx context.Context) (map[string][]string, error) {
+	return d.roomstate.selectJoinedUsers(ctx)
+}
+
+// Events lookups a list of event by their event ID.
+// Returns a list of events matching the requested IDs found in the database.
+// If an event is not found in the database then it will be omitted from the list.
+// Returns an error if there was a problem talking with the database.
+// Does not include any transaction IDs in the returned events.
+func (d *SyncServerDatasource) Events(ctx context.Context, eventIDs []string) ([]gomatrixserverlib.Event, error) {
+	streamEvents, err := d.events.selectEvents(ctx, nil, eventIDs)
+	if err != nil {
+		return nil, err
+	}
+
+	// We don't include a device here as we only include transaction IDs in
+	// incremental syncs.
+	return d.StreamEventsToEvents(nil, streamEvents), nil
+}
+
+func (d *SyncServerDatasource) handleBackwardExtremities(ctx context.Context, txn *sql.Tx, ev *gomatrixserverlib.Event) error {
+	// If the event is already known as a backward extremity, don't consider
+	// it as such anymore now that we have it.
+	isBackwardExtremity, err := d.backwardExtremities.isBackwardExtremity(ctx, txn, ev.RoomID(), ev.EventID())
+	if err != nil {
+		return err
+	}
+	if isBackwardExtremity {
+		if err = d.backwardExtremities.deleteBackwardExtremity(ctx, txn, ev.RoomID(), ev.EventID()); err != nil {
+			return err
+		}
+	}
+
+	// Check if we have all of the event's previous events. If an event is
+	// missing, add it to the room's backward extremities.
+	prevEvents, err := d.events.selectEvents(ctx, txn, ev.PrevEventIDs())
+	if err != nil {
+		return err
+	}
+	var found bool
+	for _, eID := range ev.PrevEventIDs() {
+		found = false
+		for _, prevEv := range prevEvents {
+			if eID == prevEv.EventID() {
+				found = true
+			}
+		}
+
+		// If the event is missing, consider it a backward extremity.
+		if !found {
+			if err = d.backwardExtremities.insertsBackwardExtremity(ctx, txn, ev.RoomID(), ev.EventID()); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// WriteEvent into the database. It is not safe to call this function from multiple goroutines, as it would create races
+// when generating the sync stream position for this event. Returns the sync stream position for the inserted event.
+// Returns an error if there was a problem inserting this event.
+func (d *SyncServerDatasource) WriteEvent(
+	ctx context.Context,
+	ev *gomatrixserverlib.Event,
+	addStateEvents []gomatrixserverlib.Event,
+	addStateEventIDs, removeStateEventIDs []string,
+	transactionID *api.TransactionID, excludeFromSync bool,
+) (pduPosition types.StreamPosition, returnErr error) {
+	returnErr = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		var err error
+		pos, err := d.events.insertEvent(
+			ctx, txn, ev, addStateEventIDs, removeStateEventIDs, transactionID, excludeFromSync,
+		)
+		if err != nil {
+			fmt.Println("d.events.insertEvent:", err)
+			return err
+		}
+		pduPosition = pos
+
+		if err = d.topology.insertEventInTopology(ctx, txn, ev); err != nil {
+			fmt.Println("d.topology.insertEventInTopology:", err)
+			return err
+		}
+
+		if err = d.handleBackwardExtremities(ctx, txn, ev); err != nil {
+			fmt.Println("d.handleBackwardExtremities:", err)
+			return err
+		}
+
+		if len(addStateEvents) == 0 && len(removeStateEventIDs) == 0 {
+			// Nothing to do, the event may have just been a message event.
+			fmt.Println("nothing to do")
+			return nil
+		}
+
+		return d.updateRoomState(ctx, txn, removeStateEventIDs, addStateEvents, pduPosition)
+	})
+
+	return pduPosition, returnErr
+}
+
+func (d *SyncServerDatasource) updateRoomState(
+	ctx context.Context, txn *sql.Tx,
+	removedEventIDs []string,
+	addedEvents []gomatrixserverlib.Event,
+	pduPosition types.StreamPosition,
+) error {
+	// remove first, then add, as we do not ever delete state, but do replace state which is a remove followed by an add.
+	for _, eventID := range removedEventIDs {
+		if err := d.roomstate.deleteRoomStateByEventID(ctx, txn, eventID); err != nil {
+			return err
+		}
+	}
+
+	for _, event := range addedEvents {
+		if event.StateKey() == nil {
+			// ignore non state events
+			continue
+		}
+		var membership *string
+		if event.Type() == "m.room.member" {
+			value, err := event.Membership()
+			if err != nil {
+				return err
+			}
+			membership = &value
+		}
+		if err := d.roomstate.upsertRoomState(ctx, txn, event, membership, pduPosition); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// GetStateEvent returns the Matrix state event of a given type for a given room with a given state key
+// If no event could be found, returns nil
+// If there was an issue during the retrieval, returns an error
+func (d *SyncServerDatasource) GetStateEvent(
+	ctx context.Context, roomID, evType, stateKey string,
+) (*gomatrixserverlib.Event, error) {
+	return d.roomstate.selectStateEvent(ctx, roomID, evType, stateKey)
+}
+
+// GetStateEventsForRoom fetches the state events for a given room.
+// Returns an empty slice if no state events could be found for this room.
+// Returns an error if there was an issue with the retrieval.
+func (d *SyncServerDatasource) GetStateEventsForRoom(
+	ctx context.Context, roomID string, stateFilterPart *gomatrixserverlib.StateFilter,
+) (stateEvents []gomatrixserverlib.Event, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		stateEvents, err = d.roomstate.selectCurrentState(ctx, txn, roomID, stateFilterPart)
+		return err
+	})
+	return
+}
+
+// GetEventsInRange retrieves all of the events on a given ordering using the
+// given extremities and limit.
+func (d *SyncServerDatasource) GetEventsInRange(
+	ctx context.Context,
+	from, to *types.PaginationToken,
+	roomID string, limit int,
+	backwardOrdering bool,
+) (events []types.StreamEvent, err error) {
+	// If the pagination token's type is types.PaginationTokenTypeTopology, the
+	// events must be retrieved from the rooms' topology table rather than the
+	// table contaning the syncapi server's whole stream of events.
+	if from.Type == types.PaginationTokenTypeTopology {
+		// Determine the backward and forward limit, i.e. the upper and lower
+		// limits to the selection in the room's topology, from the direction.
+		var backwardLimit, forwardLimit types.StreamPosition
+		if backwardOrdering {
+			// Backward ordering is antichronological (latest event to oldest
+			// one).
+			backwardLimit = to.PDUPosition
+			forwardLimit = from.PDUPosition
+		} else {
+			// Forward ordering is chronological (oldest event to latest one).
+			backwardLimit = from.PDUPosition
+			forwardLimit = to.PDUPosition
+		}
+
+		// Select the event IDs from the defined range.
+		var eIDs []string
+		eIDs, err = d.topology.selectEventIDsInRange(
+			ctx, nil, roomID, backwardLimit, forwardLimit, limit, !backwardOrdering,
+		)
+		if err != nil {
+			return
+		}
+
+		// Retrieve the events' contents using their IDs.
+		events, err = d.events.selectEvents(ctx, nil, eIDs)
+		return
+	}
+
+	// If the pagination token's type is types.PaginationTokenTypeStream, the
+	// events must be retrieved from the table contaning the syncapi server's
+	// whole stream of events.
+
+	if backwardOrdering {
+		// When using backward ordering, we want the most recent events first.
+		if events, err = d.events.selectRecentEvents(
+			ctx, nil, roomID, to.PDUPosition, from.PDUPosition, limit, false, false,
+		); err != nil {
+			return
+		}
+	} else {
+		// When using forward ordering, we want the least recent events first.
+		if events, err = d.events.selectEarlyEvents(
+			ctx, nil, roomID, from.PDUPosition, to.PDUPosition, limit,
+		); err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+// SyncPosition returns the latest positions for syncing.
+func (d *SyncServerDatasource) SyncPosition(ctx context.Context) (types.PaginationToken, error) {
+	return d.syncPositionTx(ctx, nil)
+}
+
+// BackwardExtremitiesForRoom returns the event IDs of all of the backward
+// extremities we know of for a given room.
+func (d *SyncServerDatasource) BackwardExtremitiesForRoom(
+	ctx context.Context, roomID string,
+) (backwardExtremities []string, err error) {
+	return d.backwardExtremities.selectBackwardExtremitiesForRoom(ctx, nil, roomID)
+}
+
+// MaxTopologicalPosition returns the highest topological position for a given
+// room.
+func (d *SyncServerDatasource) MaxTopologicalPosition(
+	ctx context.Context, roomID string,
+) (types.StreamPosition, error) {
+	return d.topology.selectMaxPositionInTopology(ctx, nil, roomID)
+}
+
+// EventsAtTopologicalPosition returns all of the events matching a given
+// position in the topology of a given room.
+func (d *SyncServerDatasource) EventsAtTopologicalPosition(
+	ctx context.Context, roomID string, pos types.StreamPosition,
+) ([]types.StreamEvent, error) {
+	eIDs, err := d.topology.selectEventIDsFromPosition(ctx, nil, roomID, pos)
+	if err != nil {
+		return nil, err
+	}
+
+	return d.events.selectEvents(ctx, nil, eIDs)
+}
+
+func (d *SyncServerDatasource) EventPositionInTopology(
+	ctx context.Context, eventID string,
+) (types.StreamPosition, error) {
+	return d.topology.selectPositionInTopology(ctx, nil, eventID)
+}
+
+// SyncStreamPosition returns the latest position in the sync stream. Returns 0 if there are no events yet.
+func (d *SyncServerDatasource) SyncStreamPosition(ctx context.Context) (types.StreamPosition, error) {
+	return d.syncStreamPositionTx(ctx, nil)
+}
+
+func (d *SyncServerDatasource) syncStreamPositionTx(
+	ctx context.Context, txn *sql.Tx,
+) (types.StreamPosition, error) {
+	maxID, err := d.events.selectMaxEventID(ctx, txn)
+	if err != nil {
+		return 0, err
+	}
+	maxAccountDataID, err := d.accountData.selectMaxAccountDataID(ctx, txn)
+	if err != nil {
+		return 0, err
+	}
+	if maxAccountDataID > maxID {
+		maxID = maxAccountDataID
+	}
+	maxInviteID, err := d.invites.selectMaxInviteID(ctx, txn)
+	if err != nil {
+		return 0, err
+	}
+	if maxInviteID > maxID {
+		maxID = maxInviteID
+	}
+	return types.StreamPosition(maxID), nil
+}
+
+func (d *SyncServerDatasource) syncPositionTx(
+	ctx context.Context, txn *sql.Tx,
+) (sp types.PaginationToken, err error) {
+
+	maxEventID, err := d.events.selectMaxEventID(ctx, txn)
+	if err != nil {
+		return sp, err
+	}
+	maxAccountDataID, err := d.accountData.selectMaxAccountDataID(ctx, txn)
+	if err != nil {
+		return sp, err
+	}
+	if maxAccountDataID > maxEventID {
+		maxEventID = maxAccountDataID
+	}
+	maxInviteID, err := d.invites.selectMaxInviteID(ctx, txn)
+	if err != nil {
+		return sp, err
+	}
+	if maxInviteID > maxEventID {
+		maxEventID = maxInviteID
+	}
+	sp.PDUPosition = types.StreamPosition(maxEventID)
+	sp.EDUTypingPosition = types.StreamPosition(d.typingCache.GetLatestSyncPosition())
+	return
+}
+
+// addPDUDeltaToResponse adds all PDU deltas to a sync response.
+// IDs of all rooms the user joined are returned so EDU deltas can be added for them.
+func (d *SyncServerDatasource) addPDUDeltaToResponse(
+	ctx context.Context,
+	device authtypes.Device,
+	fromPos, toPos types.StreamPosition,
+	numRecentEventsPerRoom int,
+	wantFullState bool,
+	res *types.Response,
+) (joinedRoomIDs []string, err error) {
+	txn, err := d.db.BeginTx(ctx, &txReadOnlySnapshot)
+	if err != nil {
+		return nil, err
+	}
+	var succeeded bool
+	defer func() {
+		txerr := common.EndTransaction(txn, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
+
+	stateFilterPart := gomatrixserverlib.DefaultStateFilter() // TODO: use filter provided in request
+
+	// Work out which rooms to return in the response. This is done by getting not only the currently
+	// joined rooms, but also which rooms have membership transitions for this user between the 2 PDU stream positions.
+	// This works out what the 'state' key should be for each room as well as which membership block
+	// to put the room into.
+	var deltas []stateDelta
+	if !wantFullState {
+		deltas, joinedRoomIDs, err = d.getStateDeltas(
+			ctx, &device, txn, fromPos, toPos, device.UserID, &stateFilterPart,
+		)
+	} else {
+		deltas, joinedRoomIDs, err = d.getStateDeltasForFullStateSync(
+			ctx, &device, txn, fromPos, toPos, device.UserID, &stateFilterPart,
+		)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	for _, delta := range deltas {
+		err = d.addRoomDeltaToResponse(ctx, &device, txn, fromPos, toPos, delta, numRecentEventsPerRoom, res)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// TODO: This should be done in getStateDeltas
+	if err = d.addInvitesToResponse(ctx, txn, device.UserID, fromPos, toPos, res); err != nil {
+		return nil, err
+	}
+
+	succeeded = true
+	return joinedRoomIDs, nil
+}
+
+// addTypingDeltaToResponse adds all typing notifications to a sync response
+// since the specified position.
+func (d *SyncServerDatasource) addTypingDeltaToResponse(
+	since types.PaginationToken,
+	joinedRoomIDs []string,
+	res *types.Response,
+) error {
+	var jr types.JoinResponse
+	var ok bool
+	var err error
+	for _, roomID := range joinedRoomIDs {
+		if typingUsers, updated := d.typingCache.GetTypingUsersIfUpdatedAfter(
+			roomID, int64(since.EDUTypingPosition),
+		); updated {
+			ev := gomatrixserverlib.ClientEvent{
+				Type: gomatrixserverlib.MTyping,
+			}
+			ev.Content, err = json.Marshal(map[string]interface{}{
+				"user_ids": typingUsers,
+			})
+			if err != nil {
+				return err
+			}
+
+			if jr, ok = res.Rooms.Join[roomID]; !ok {
+				jr = *types.NewJoinResponse()
+			}
+			jr.Ephemeral.Events = append(jr.Ephemeral.Events, ev)
+			res.Rooms.Join[roomID] = jr
+		}
+	}
+	return nil
+}
+
+// addEDUDeltaToResponse adds updates for EDUs of each type since fromPos if
+// the positions of that type are not equal in fromPos and toPos.
+func (d *SyncServerDatasource) addEDUDeltaToResponse(
+	fromPos, toPos types.PaginationToken,
+	joinedRoomIDs []string,
+	res *types.Response,
+) (err error) {
+
+	if fromPos.EDUTypingPosition != toPos.EDUTypingPosition {
+		err = d.addTypingDeltaToResponse(
+			fromPos, joinedRoomIDs, res,
+		)
+	}
+
+	return
+}
+
+// IncrementalSync returns all the data needed in order to create an incremental
+// sync response for the given user. Events returned will include any client
+// transaction IDs associated with the given device. These transaction IDs come
+// from when the device sent the event via an API that included a transaction
+// ID.
+func (d *SyncServerDatasource) IncrementalSync(
+	ctx context.Context,
+	device authtypes.Device,
+	fromPos, toPos types.PaginationToken,
+	numRecentEventsPerRoom int,
+	wantFullState bool,
+) (*types.Response, error) {
+	nextBatchPos := fromPos.WithUpdates(toPos)
+	res := types.NewResponse(nextBatchPos)
+
+	var joinedRoomIDs []string
+	var err error
+	if fromPos.PDUPosition != toPos.PDUPosition || wantFullState {
+		joinedRoomIDs, err = d.addPDUDeltaToResponse(
+			ctx, device, fromPos.PDUPosition, toPos.PDUPosition, numRecentEventsPerRoom, wantFullState, res,
+		)
+	} else {
+		joinedRoomIDs, err = d.roomstate.selectRoomIDsWithMembership(
+			ctx, nil, device.UserID, gomatrixserverlib.Join,
+		)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	err = d.addEDUDeltaToResponse(
+		fromPos, toPos, joinedRoomIDs, res,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+// getResponseWithPDUsForCompleteSync creates a response and adds all PDUs needed
+// to it. It returns toPos and joinedRoomIDs for use of adding EDUs.
+func (d *SyncServerDatasource) getResponseWithPDUsForCompleteSync(
+	ctx context.Context,
+	userID string,
+	numRecentEventsPerRoom int,
+) (
+	res *types.Response,
+	toPos types.PaginationToken,
+	joinedRoomIDs []string,
+	err error,
+) {
+	// This needs to be all done in a transaction as we need to do multiple SELECTs, and we need to have
+	// a consistent view of the database throughout. This includes extracting the sync position.
+	// This does have the unfortunate side-effect that all the matrixy logic resides in this function,
+	// but it's better to not hide the fact that this is being done in a transaction.
+	txn, err := d.db.BeginTx(ctx, &txReadOnlySnapshot)
+	if err != nil {
+		return
+	}
+	var succeeded bool
+	defer func() {
+		txerr := common.EndTransaction(txn, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
+
+	// Get the current sync position which we will base the sync response on.
+	toPos, err = d.syncPositionTx(ctx, txn)
+	if err != nil {
+		return
+	}
+
+	res = types.NewResponse(toPos)
+
+	// Extract room state and recent events for all rooms the user is joined to.
+	joinedRoomIDs, err = d.roomstate.selectRoomIDsWithMembership(ctx, txn, userID, gomatrixserverlib.Join)
+	if err != nil {
+		return
+	}
+	fmt.Println("Joined rooms:", joinedRoomIDs)
+
+	stateFilterPart := gomatrixserverlib.DefaultStateFilter() // TODO: use filter provided in request
+
+	// Build up a /sync response. Add joined rooms.
+	for _, roomID := range joinedRoomIDs {
+		fmt.Println("WE'RE ON", roomID)
+
+		var stateEvents []gomatrixserverlib.Event
+		stateEvents, err = d.roomstate.selectCurrentState(ctx, txn, roomID, &stateFilterPart)
+		if err != nil {
+			fmt.Println("d.roomstate.selectCurrentState:", err)
+			return
+		}
+		//fmt.Println("State events:", stateEvents)
+		// TODO: When filters are added, we may need to call this multiple times to get enough events.
+		//       See: https://github.com/matrix-org/synapse/blob/v0.19.3/synapse/handlers/sync.py#L316
+		var recentStreamEvents []types.StreamEvent
+		recentStreamEvents, err = d.events.selectRecentEvents(
+			ctx, txn, roomID, types.StreamPosition(0), toPos.PDUPosition,
+			numRecentEventsPerRoom, true, true,
+		)
+		if err != nil {
+			fmt.Println("d.events.selectRecentEvents:", err)
+			return
+		}
+		//fmt.Println("Recent stream events:", recentStreamEvents)
+
+		// Retrieve the backward topology position, i.e. the position of the
+		// oldest event in the room's topology.
+		var backwardTopologyPos types.StreamPosition
+		backwardTopologyPos, err = d.topology.selectPositionInTopology(ctx, txn, recentStreamEvents[0].EventID())
+		if err != nil {
+			fmt.Println("d.topology.selectPositionInTopology:", err)
+			return nil, types.PaginationToken{}, []string{}, err
+		}
+		fmt.Println("Backward topology position:", backwardTopologyPos)
+		if backwardTopologyPos-1 <= 0 {
+			backwardTopologyPos = types.StreamPosition(1)
+		} else {
+			backwardTopologyPos--
+		}
+
+		// We don't include a device here as we don't need to send down
+		// transaction IDs for complete syncs
+		recentEvents := d.StreamEventsToEvents(nil, recentStreamEvents)
+		stateEvents = removeDuplicates(stateEvents, recentEvents)
+		jr := types.NewJoinResponse()
+		jr.Timeline.PrevBatch = types.NewPaginationTokenFromTypeAndPosition(
+			types.PaginationTokenTypeTopology, backwardTopologyPos, 0,
+		).String()
+		jr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
+		jr.Timeline.Limited = true
+		jr.State.Events = gomatrixserverlib.ToClientEvents(stateEvents, gomatrixserverlib.FormatSync)
+		res.Rooms.Join[roomID] = *jr
+	}
+
+	if err = d.addInvitesToResponse(ctx, txn, userID, 0, toPos.PDUPosition, res); err != nil {
+		fmt.Println("d.addInvitesToResponse:", err)
+		return
+	}
+
+	succeeded = true
+	return res, toPos, joinedRoomIDs, err
+}
+
+// CompleteSync returns a complete /sync API response for the given user.
+func (d *SyncServerDatasource) CompleteSync(
+	ctx context.Context, userID string, numRecentEventsPerRoom int,
+) (*types.Response, error) {
+	res, toPos, joinedRoomIDs, err := d.getResponseWithPDUsForCompleteSync(
+		ctx, userID, numRecentEventsPerRoom,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// Use a zero value SyncPosition for fromPos so all EDU states are added.
+	err = d.addEDUDeltaToResponse(
+		types.PaginationToken{}, toPos, joinedRoomIDs, res,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+var txReadOnlySnapshot = sql.TxOptions{
+	// Set the isolation level so that we see a snapshot of the database.
+	// In PostgreSQL repeatable read transactions will see a snapshot taken
+	// at the first query, and since the transaction is read-only it can't
+	// run into any serialisation errors.
+	// https://www.postgresql.org/docs/9.5/static/transaction-iso.html#XACT-REPEATABLE-READ
+	Isolation: sql.LevelRepeatableRead,
+	ReadOnly:  true,
+}
+
+// GetAccountDataInRange returns all account data for a given user inserted or
+// updated between two given positions
+// Returns a map following the format data[roomID] = []dataTypes
+// If no data is retrieved, returns an empty map
+// If there was an issue with the retrieval, returns an error
+func (d *SyncServerDatasource) GetAccountDataInRange(
+	ctx context.Context, userID string, oldPos, newPos types.StreamPosition,
+	accountDataFilterPart *gomatrixserverlib.EventFilter,
+) (map[string][]string, error) {
+	return d.accountData.selectAccountDataInRange(ctx, userID, oldPos, newPos, accountDataFilterPart)
+}
+
+// UpsertAccountData keeps track of new or updated account data, by saving the type
+// of the new/updated data, and the user ID and room ID the data is related to (empty)
+// room ID means the data isn't specific to any room)
+// If no data with the given type, user ID and room ID exists in the database,
+// creates a new row, else update the existing one
+// Returns an error if there was an issue with the upsert
+func (d *SyncServerDatasource) UpsertAccountData(
+	ctx context.Context, userID, roomID, dataType string,
+) (sp types.StreamPosition, err error) {
+	txn, err := d.db.BeginTx(ctx, nil)
+	if err != nil {
+		return types.StreamPosition(0), err
+	}
+	var succeeded bool
+	defer func() {
+		txerr := common.EndTransaction(txn, &succeeded)
+		if err == nil && txerr != nil {
+			err = txerr
+		}
+	}()
+	sp, err = d.accountData.insertAccountData(ctx, txn, userID, roomID, dataType)
+	return
+}
+
+// AddInviteEvent stores a new invite event for a user.
+// If the invite was successfully stored this returns the stream ID it was stored at.
+// Returns an error if there was a problem communicating with the database.
+func (d *SyncServerDatasource) AddInviteEvent(
+	ctx context.Context, inviteEvent gomatrixserverlib.Event,
+) (types.StreamPosition, error) {
+	return d.invites.insertInviteEvent(ctx, inviteEvent)
+}
+
+// RetireInviteEvent removes an old invite event from the database.
+// Returns an error if there was a problem communicating with the database.
+func (d *SyncServerDatasource) RetireInviteEvent(
+	ctx context.Context, inviteEventID string,
+) error {
+	// TODO: Record that invite has been retired in a stream so that we can
+	// notify the user in an incremental sync.
+	err := d.invites.deleteInviteEvent(ctx, inviteEventID)
+	return err
+}
+
+func (d *SyncServerDatasource) SetTypingTimeoutCallback(fn cache.TimeoutCallbackFn) {
+	d.typingCache.SetTimeoutCallback(fn)
+}
+
+// AddTypingUser adds a typing user to the typing cache.
+// Returns the newly calculated sync position for typing notifications.
+func (d *SyncServerDatasource) AddTypingUser(
+	userID, roomID string, expireTime *time.Time,
+) types.StreamPosition {
+	return types.StreamPosition(d.typingCache.AddTypingUser(userID, roomID, expireTime))
+}
+
+// RemoveTypingUser removes a typing user from the typing cache.
+// Returns the newly calculated sync position for typing notifications.
+func (d *SyncServerDatasource) RemoveTypingUser(
+	userID, roomID string,
+) types.StreamPosition {
+	return types.StreamPosition(d.typingCache.RemoveUser(userID, roomID))
+}
+
+func (d *SyncServerDatasource) addInvitesToResponse(
+	ctx context.Context, txn *sql.Tx,
+	userID string,
+	fromPos, toPos types.StreamPosition,
+	res *types.Response,
+) error {
+	invites, err := d.invites.selectInviteEventsInRange(
+		ctx, txn, userID, fromPos, toPos,
+	)
+	if err != nil {
+		return err
+	}
+	for roomID, inviteEvent := range invites {
+		ir := types.NewInviteResponse()
+		ir.InviteState.Events = gomatrixserverlib.ToClientEvents(
+			[]gomatrixserverlib.Event{inviteEvent}, gomatrixserverlib.FormatSync,
+		)
+		// TODO: add the invite state from the invite event.
+		res.Rooms.Invite[roomID] = *ir
+	}
+	return nil
+}
+
+// Retrieve the backward topology position, i.e. the position of the
+// oldest event in the room's topology.
+func (d *SyncServerDatasource) getBackwardTopologyPos(
+	ctx context.Context, txn *sql.Tx,
+	events []types.StreamEvent,
+) (pos types.StreamPosition) {
+	if len(events) > 0 {
+		pos, _ = d.topology.selectPositionInTopology(ctx, txn, events[0].EventID())
+	}
+	if pos-1 <= 0 {
+		pos = types.StreamPosition(1)
+	} else {
+		pos = pos - 1
+	}
+	return
+}
+
+// addRoomDeltaToResponse adds a room state delta to a sync response
+func (d *SyncServerDatasource) addRoomDeltaToResponse(
+	ctx context.Context,
+	device *authtypes.Device,
+	txn *sql.Tx,
+	fromPos, toPos types.StreamPosition,
+	delta stateDelta,
+	numRecentEventsPerRoom int,
+	res *types.Response,
+) error {
+	endPos := toPos
+	if delta.membershipPos > 0 && delta.membership == gomatrixserverlib.Leave {
+		// make sure we don't leak recent events after the leave event.
+		// TODO: History visibility makes this somewhat complex to handle correctly. For example:
+		// TODO: This doesn't work for join -> leave in a single /sync request (see events prior to join).
+		// TODO: This will fail on join -> leave -> sensitive msg -> join -> leave
+		//       in a single /sync request
+		// This is all "okay" assuming history_visibility == "shared" which it is by default.
+		endPos = delta.membershipPos
+	}
+	recentStreamEvents, err := d.events.selectRecentEvents(
+		ctx, txn, delta.roomID, types.StreamPosition(fromPos), types.StreamPosition(endPos),
+		numRecentEventsPerRoom, true, true,
+	)
+	if err != nil {
+		return err
+	}
+	recentEvents := d.StreamEventsToEvents(device, recentStreamEvents)
+	delta.stateEvents = removeDuplicates(delta.stateEvents, recentEvents) // roll back
+	backwardTopologyPos := d.getBackwardTopologyPos(ctx, txn, recentStreamEvents)
+
+	switch delta.membership {
+	case gomatrixserverlib.Join:
+		jr := types.NewJoinResponse()
+
+		jr.Timeline.PrevBatch = types.NewPaginationTokenFromTypeAndPosition(
+			types.PaginationTokenTypeTopology, backwardTopologyPos, 0,
+		).String()
+		jr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
+		jr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
+		jr.State.Events = gomatrixserverlib.ToClientEvents(delta.stateEvents, gomatrixserverlib.FormatSync)
+		res.Rooms.Join[delta.roomID] = *jr
+	case gomatrixserverlib.Leave:
+		fallthrough // transitions to leave are the same as ban
+	case gomatrixserverlib.Ban:
+		// TODO: recentEvents may contain events that this user is not allowed to see because they are
+		//       no longer in the room.
+		lr := types.NewLeaveResponse()
+		lr.Timeline.PrevBatch = types.NewPaginationTokenFromTypeAndPosition(
+			types.PaginationTokenTypeTopology, backwardTopologyPos, 0,
+		).String()
+		lr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
+		lr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
+		lr.State.Events = gomatrixserverlib.ToClientEvents(delta.stateEvents, gomatrixserverlib.FormatSync)
+		res.Rooms.Leave[delta.roomID] = *lr
+	}
+
+	return nil
+}
+
+// fetchStateEvents converts the set of event IDs into a set of events. It will fetch any which are missing from the database.
+// Returns a map of room ID to list of events.
+func (d *SyncServerDatasource) fetchStateEvents(
+	ctx context.Context, txn *sql.Tx,
+	roomIDToEventIDSet map[string]map[string]bool,
+	eventIDToEvent map[string]types.StreamEvent,
+) (map[string][]types.StreamEvent, error) {
+	stateBetween := make(map[string][]types.StreamEvent)
+	missingEvents := make(map[string][]string)
+	for roomID, ids := range roomIDToEventIDSet {
+		events := stateBetween[roomID]
+		for id, need := range ids {
+			if !need {
+				continue // deleted state
+			}
+			e, ok := eventIDToEvent[id]
+			if ok {
+				events = append(events, e)
+			} else {
+				m := missingEvents[roomID]
+				m = append(m, id)
+				missingEvents[roomID] = m
+			}
+		}
+		stateBetween[roomID] = events
+	}
+
+	if len(missingEvents) > 0 {
+		// This happens when add_state_ids has an event ID which is not in the provided range.
+		// We need to explicitly fetch them.
+		allMissingEventIDs := []string{}
+		for _, missingEvIDs := range missingEvents {
+			allMissingEventIDs = append(allMissingEventIDs, missingEvIDs...)
+		}
+		evs, err := d.fetchMissingStateEvents(ctx, txn, allMissingEventIDs)
+		if err != nil {
+			return nil, err
+		}
+		// we know we got them all otherwise an error would've been returned, so just loop the events
+		for _, ev := range evs {
+			roomID := ev.RoomID()
+			stateBetween[roomID] = append(stateBetween[roomID], ev)
+		}
+	}
+	return stateBetween, nil
+}
+
+func (d *SyncServerDatasource) fetchMissingStateEvents(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]types.StreamEvent, error) {
+	// Fetch from the events table first so we pick up the stream ID for the
+	// event.
+	events, err := d.events.selectEvents(ctx, txn, eventIDs)
+	if err != nil {
+		return nil, err
+	}
+
+	have := map[string]bool{}
+	for _, event := range events {
+		have[event.EventID()] = true
+	}
+	var missing []string
+	for _, eventID := range eventIDs {
+		if !have[eventID] {
+			missing = append(missing, eventID)
+		}
+	}
+	if len(missing) == 0 {
+		return events, nil
+	}
+
+	// If they are missing from the events table then they should be state
+	// events that we received from outside the main event stream.
+	// These should be in the room state table.
+	stateEvents, err := d.roomstate.selectEventsWithEventIDs(ctx, txn, missing)
+
+	if err != nil {
+		return nil, err
+	}
+	if len(stateEvents) != len(missing) {
+		return nil, fmt.Errorf("failed to map all event IDs to events: (got %d, wanted %d)", len(stateEvents), len(missing))
+	}
+	events = append(events, stateEvents...)
+	return events, nil
+}
+
+// getStateDeltas returns the state deltas between fromPos and toPos,
+// exclusive of oldPos, inclusive of newPos, for the rooms in which
+// the user has new membership events.
+// A list of joined room IDs is also returned in case the caller needs it.
+func (d *SyncServerDatasource) getStateDeltas(
+	ctx context.Context, device *authtypes.Device, txn *sql.Tx,
+	fromPos, toPos types.StreamPosition, userID string,
+	stateFilterPart *gomatrixserverlib.StateFilter,
+) ([]stateDelta, []string, error) {
+	// Implement membership change algorithm: https://github.com/matrix-org/synapse/blob/v0.19.3/synapse/handlers/sync.py#L821
+	// - Get membership list changes for this user in this sync response
+	// - For each room which has membership list changes:
+	//     * Check if the room is 'newly joined' (insufficient to just check for a join event because we allow dupe joins TODO).
+	//       If it is, then we need to send the full room state down (and 'limited' is always true).
+	//     * Check if user is still CURRENTLY invited to the room. If so, add room to 'invited' block.
+	//     * Check if the user is CURRENTLY (TODO) left/banned. If so, add room to 'archived' block.
+	// - Get all CURRENTLY joined rooms, and add them to 'joined' block.
+	var deltas []stateDelta
+
+	// get all the state events ever between these two positions
+	stateNeeded, eventMap, err := d.events.selectStateInRange(ctx, txn, fromPos, toPos, stateFilterPart)
+	if err != nil {
+		return nil, nil, err
+	}
+	state, err := d.fetchStateEvents(ctx, txn, stateNeeded, eventMap)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	for roomID, stateStreamEvents := range state {
+		for _, ev := range stateStreamEvents {
+			// TODO: Currently this will incorrectly add rooms which were ALREADY joined but they sent another no-op join event.
+			//       We should be checking if the user was already joined at fromPos and not proceed if so. As a result of this,
+			//       dupe join events will result in the entire room state coming down to the client again. This is added in
+			//       the 'state' part of the response though, so is transparent modulo bandwidth concerns as it is not added to
+			//       the timeline.
+			if membership := getMembershipFromEvent(&ev.Event, userID); membership != "" {
+				if membership == gomatrixserverlib.Join {
+					// send full room state down instead of a delta
+					var s []types.StreamEvent
+					s, err = d.currentStateStreamEventsForRoom(ctx, txn, roomID, stateFilterPart)
+					if err != nil {
+						return nil, nil, err
+					}
+					state[roomID] = s
+					continue // we'll add this room in when we do joined rooms
+				}
+
+				deltas = append(deltas, stateDelta{
+					membership:    membership,
+					membershipPos: ev.StreamPosition,
+					stateEvents:   d.StreamEventsToEvents(device, stateStreamEvents),
+					roomID:        roomID,
+				})
+				break
+			}
+		}
+	}
+
+	// Add in currently joined rooms
+	joinedRoomIDs, err := d.roomstate.selectRoomIDsWithMembership(ctx, txn, userID, gomatrixserverlib.Join)
+	if err != nil {
+		return nil, nil, err
+	}
+	for _, joinedRoomID := range joinedRoomIDs {
+		deltas = append(deltas, stateDelta{
+			membership:  gomatrixserverlib.Join,
+			stateEvents: d.StreamEventsToEvents(device, state[joinedRoomID]),
+			roomID:      joinedRoomID,
+		})
+	}
+
+	return deltas, joinedRoomIDs, nil
+}
+
+// getStateDeltasForFullStateSync is a variant of getStateDeltas used for /sync
+// requests with full_state=true.
+// Fetches full state for all joined rooms and uses selectStateInRange to get
+// updates for other rooms.
+func (d *SyncServerDatasource) getStateDeltasForFullStateSync(
+	ctx context.Context, device *authtypes.Device, txn *sql.Tx,
+	fromPos, toPos types.StreamPosition, userID string,
+	stateFilterPart *gomatrixserverlib.StateFilter,
+) ([]stateDelta, []string, error) {
+	joinedRoomIDs, err := d.roomstate.selectRoomIDsWithMembership(ctx, txn, userID, gomatrixserverlib.Join)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Use a reasonable initial capacity
+	deltas := make([]stateDelta, 0, len(joinedRoomIDs))
+
+	// Add full states for all joined rooms
+	for _, joinedRoomID := range joinedRoomIDs {
+		s, stateErr := d.currentStateStreamEventsForRoom(ctx, txn, joinedRoomID, stateFilterPart)
+		if stateErr != nil {
+			return nil, nil, stateErr
+		}
+		deltas = append(deltas, stateDelta{
+			membership:  gomatrixserverlib.Join,
+			stateEvents: d.StreamEventsToEvents(device, s),
+			roomID:      joinedRoomID,
+		})
+	}
+
+	// Get all the state events ever between these two positions
+	stateNeeded, eventMap, err := d.events.selectStateInRange(ctx, txn, fromPos, toPos, stateFilterPart)
+	if err != nil {
+		return nil, nil, err
+	}
+	state, err := d.fetchStateEvents(ctx, txn, stateNeeded, eventMap)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	for roomID, stateStreamEvents := range state {
+		for _, ev := range stateStreamEvents {
+			if membership := getMembershipFromEvent(&ev.Event, userID); membership != "" {
+				if membership != gomatrixserverlib.Join { // We've already added full state for all joined rooms above.
+					deltas = append(deltas, stateDelta{
+						membership:    membership,
+						membershipPos: ev.StreamPosition,
+						stateEvents:   d.StreamEventsToEvents(device, stateStreamEvents),
+						roomID:        roomID,
+					})
+				}
+
+				break
+			}
+		}
+	}
+
+	return deltas, joinedRoomIDs, nil
+}
+
+func (d *SyncServerDatasource) currentStateStreamEventsForRoom(
+	ctx context.Context, txn *sql.Tx, roomID string,
+	stateFilterPart *gomatrixserverlib.StateFilter,
+) ([]types.StreamEvent, error) {
+	allState, err := d.roomstate.selectCurrentState(ctx, txn, roomID, stateFilterPart)
+	if err != nil {
+		return nil, err
+	}
+	s := make([]types.StreamEvent, len(allState))
+	for i := 0; i < len(s); i++ {
+		s[i] = types.StreamEvent{Event: allState[i], StreamPosition: 0}
+	}
+	return s, nil
+}
+
+// StreamEventsToEvents converts streamEvent to Event. If device is non-nil and
+// matches the streamevent.transactionID device then the transaction ID gets
+// added to the unsigned section of the output event.
+func (d *SyncServerDatasource) StreamEventsToEvents(device *authtypes.Device, in []types.StreamEvent) []gomatrixserverlib.Event {
+	out := make([]gomatrixserverlib.Event, len(in))
+	for i := 0; i < len(in); i++ {
+		out[i] = in[i].Event
+		if device != nil && in[i].TransactionID != nil {
+			if device.UserID == in[i].Sender() && device.SessionID == in[i].TransactionID.SessionID {
+				err := out[i].SetUnsignedField(
+					"transaction_id", in[i].TransactionID.TransactionID,
+				)
+				if err != nil {
+					logrus.WithFields(logrus.Fields{
+						"event_id": out[i].EventID(),
+					}).WithError(err).Warnf("Failed to add transaction ID to event")
+				}
+			}
+		}
+	}
+	return out
+}
+
+// There may be some overlap where events in stateEvents are already in recentEvents, so filter
+// them out so we don't include them twice in the /sync response. They should be in recentEvents
+// only, so clients get to the correct state once they have rolled forward.
+func removeDuplicates(stateEvents, recentEvents []gomatrixserverlib.Event) []gomatrixserverlib.Event {
+	for _, recentEv := range recentEvents {
+		if recentEv.StateKey() == nil {
+			continue // not a state event
+		}
+		// TODO: This is a linear scan over all the current state events in this room. This will
+		//       be slow for big rooms. We should instead sort the state events by event ID  (ORDER BY)
+		//       then do a binary search to find matching events, similar to what roomserver does.
+		for j := 0; j < len(stateEvents); j++ {
+			if stateEvents[j].EventID() == recentEv.EventID() {
+				// overwrite the element to remove with the last element then pop the last element.
+				// This is orders of magnitude faster than re-slicing, but doesn't preserve ordering
+				// (we don't care about the order of stateEvents)
+				stateEvents[j] = stateEvents[len(stateEvents)-1]
+				stateEvents = stateEvents[:len(stateEvents)-1]
+				break // there shouldn't be multiple events with the same event ID
+			}
+		}
+	}
+	return stateEvents
+}
+
+// getMembershipFromEvent returns the value of content.membership iff the event is a state event
+// with type 'm.room.member' and state_key of userID. Otherwise, an empty string is returned.
+func getMembershipFromEvent(ev *gomatrixserverlib.Event, userID string) string {
+	if ev.Type() == "m.room.member" && ev.StateKeyEquals(userID) {
+		membership, err := ev.Membership()
+		if err != nil {
+			return ""
+		}
+		return membership
+	}
+	return ""
+}
diff --git a/syncapi/storage/storage.go b/syncapi/storage/storage.go
index e6392844..c87024b2 100644
--- a/syncapi/storage/storage.go
+++ b/syncapi/storage/storage.go
@@ -23,6 +23,7 @@ import (
 	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/syncapi/storage/postgres"
+	"github.com/matrix-org/dendrite/syncapi/storage/sqlite3"
 	"github.com/matrix-org/dendrite/syncapi/types"
 	"github.com/matrix-org/dendrite/typingserver/cache"
 	"github.com/matrix-org/gomatrixserverlib"
@@ -63,6 +64,8 @@ func NewSyncServerDatasource(dataSourceName string) (Database, error) {
 	switch uri.Scheme {
 	case "postgres":
 		return postgres.NewSyncServerDatasource(dataSourceName)
+	case "file":
+		return sqlite3.NewSyncServerDatasource(dataSourceName)
 	default:
 		return postgres.NewSyncServerDatasource(dataSourceName)
 	}
diff --git a/syncapi/sync/requestpool.go b/syncapi/sync/requestpool.go
index 06a8d6d8..22bd239f 100644
--- a/syncapi/sync/requestpool.go
+++ b/syncapi/sync/requestpool.go
@@ -32,12 +32,12 @@ import (
 // RequestPool manages HTTP long-poll connections for /sync
 type RequestPool struct {
 	db        storage.Database
-	accountDB *accounts.Database
+	accountDB accounts.Database
 	notifier  *Notifier
 }
 
 // NewRequestPool makes a new RequestPool
-func NewRequestPool(db storage.Database, n *Notifier, adb *accounts.Database) *RequestPool {
+func NewRequestPool(db storage.Database, n *Notifier, adb accounts.Database) *RequestPool {
 	return &RequestPool{db, adb, n}
 }
 
diff --git a/syncapi/syncapi.go b/syncapi/syncapi.go
index ecf532ca..1535d2b1 100644
--- a/syncapi/syncapi.go
+++ b/syncapi/syncapi.go
@@ -36,8 +36,8 @@ import (
 // component.
 func SetupSyncAPIComponent(
 	base *basecomponent.BaseDendrite,
-	deviceDB *devices.Database,
-	accountsDB *accounts.Database,
+	deviceDB devices.Database,
+	accountsDB accounts.Database,
 	queryAPI api.RoomserverQueryAPI,
 	federation *gomatrixserverlib.FederationClient,
 	cfg *config.Dendrite,