[age restriction] progress 8/n

More work towards support for extensions and age restriction

- updated gana
- added handler for DB-Event
- added TEH_extensions_init() and _done()
- added global for age restriction
- added stub for post handler
- added SQL-table for extension metadata
- added enum type for extensions and other data structures

Also:
- fixed some warnings -Wmaybe-unitialized

1 files changed, 16 insertions, 0 deletions

diff --git a/src/exchangedb/exchange-0001.sql b/src/exchangedb/exchange-0001.sql
index dcd0cb091..1c532d425 100644
--- a/src/exchangedb/exchange-0001.sql
+++ b/src/exchangedb/exchange-0001.sql
@@ -280,6 +280,22 @@ COMMENT ON TABLE signkey_revocations
   IS 'Table storing which online signing keys have been revoked';
 
 
+CREATE TABLE IF NOT EXISTS extensions
+  (extension_id BIGSERIAL UNIQUE
+  ,name VARCHAR NOT NULL UNIQUE
+  ,config BYTEA NOT NULL
+  ,config_sig BYTEA NOT NULL
+  );
+COMMENT ON TABLE extensions
+  IS 'Configurations of the activated extensions';
+COMMENT ON COLUMN extensions.name
+  IS 'Name of the extension';
+COMMENT ON COLUMN extensions.config
+  IS 'Configuration of the extension as JSON-blob';
+COMMENT ON COLUMN extensions.config
+  IS 'Signature of the configuration of an extension, signed with the master key of the exchange';
+
+
 CREATE TABLE IF NOT EXISTS known_coins
   (known_coin_id BIGSERIAL UNIQUE
   ,coin_pub BYTEA NOT NULL PRIMARY KEY CHECK (LENGTH(coin_pub)=32)