Merge pull request #1063 from kaleido-io/dupevent

Delete duplicate blockchainevents when migrating

Author: peterbroadhurst

db/migrations/postgres/000099_fix_blockchainevent_protocolid_index.up.sql

@@ -1,5 +1,7 @@
 BEGIN;
 DROP INDEX blockchainevents_protocolid;
+DELETE FROM blockchainevents WHERE listener_id IS NULL AND seq NOT IN (
+  SELECT MIN(seq) FROM blockchainevents WHERE listener_id IS NULL GROUP BY namespace, protocol_id);
 CREATE UNIQUE INDEX blockchainevents_protocolid ON blockchainevents(namespace, protocol_id) WHERE listener_id IS NULL;
 CREATE UNIQUE INDEX blockchainevents_listener_protocolid ON blockchainevents(namespace, listener_id, protocol_id) WHERE listener_id IS NOT NULL;
 COMMIT;

db/migrations/sqlite/000099_fix_blockchainevent_protocolid_index.up.sql

@@ -1,3 +1,5 @@
 DROP INDEX blockchainevents_protocolid;
+DELETE FROM blockchainevents WHERE listener_id IS NULL AND seq NOT IN (
+  SELECT MIN(seq) FROM blockchainevents WHERE listener_id IS NULL GROUP BY namespace, protocol_id);
 CREATE UNIQUE INDEX blockchainevents_protocolid ON blockchainevents(namespace, protocol_id) WHERE listener_id IS NULL;
 CREATE UNIQUE INDEX blockchainevents_listener_protocolid ON blockchainevents(namespace, listener_id, protocol_id) WHERE listener_id IS NOT NULL;