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--
-- This file is part of TALER
-- Copyright (C) 2021 Taler Systems SA
--
-- TALER is free software; you can redistribute it and/or modify it under the
-- terms of the GNU General Public License as published by the Free Software
-- Foundation; either version 3, or (at your option) any later version.
--
-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License along with
-- TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
--
-- Everything in one big transaction
BEGIN;
-- Check patch versioning is in place.
SELECT _v.register_patch('exchange-0003', NULL, NULL);
ALTER TABLE deposits
ADD COLUMN shard INT4 NOT NULL DEFAULT 0;
COMMENT ON COLUMN deposits.shard
IS 'Used for load sharding. Should be set based on h_wire, merchant_pub and a service salt. Default of 0 onlyapplies for columns migrated from a previous version without sharding support. 64-bit value because we need an *unsigned* 32-bit value.';
DROP INDEX deposits_get_ready_index;
CREATE INDEX deposits_get_ready_index
ON deposits
(shard
,tiny
,done
,wire_deadline
,refund_deadline
);
COMMENT ON INDEX deposits_get_ready_index
IS 'for deposits_get_ready';
CREATE UNLOGGED TABLE IF NOT EXISTS revolving_work_shards
(shard_serial_id BIGSERIAL UNIQUE
,last_attempt INT8 NOT NULL
,start_row INT4 NOT NULL
,end_row INT4 NOT NULL
,active BOOLEAN NOT NULL DEFAULT FALSE
,job_name VARCHAR NOT NULL
,PRIMARY KEY (job_name, start_row)
);
CREATE INDEX IF NOT EXISTS revolving_work_shards_index
ON revolving_work_shards
(job_name
,active
,last_attempt
);
COMMENT ON TABLE revolving_work_shards
IS 'coordinates work between multiple processes working on the same job with partitions that need to be repeatedly processed; unlogged because on system crashes the locks represented by this table will have to be cleared anyway, typically using "taler-exchange-dbinit -s"';
COMMENT ON COLUMN revolving_work_shards.shard_serial_id
IS 'unique serial number identifying the shard';
COMMENT ON COLUMN revolving_work_shards.last_attempt
IS 'last time a worker attempted to work on the shard';
COMMENT ON COLUMN revolving_work_shards.active
IS 'set to TRUE when a worker is active on the shard';
COMMENT ON COLUMN revolving_work_shards.start_row
IS 'row at which the shard scope starts, inclusive';
COMMENT ON COLUMN revolving_work_shards.end_row
IS 'row at which the shard scope ends, exclusive';
COMMENT ON COLUMN revolving_work_shards.job_name
IS 'unique name of the job the workers on this shard are performing';
-- Complete transaction
COMMIT;
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