fix(setup): optimise events indexes (#5316)

cmd/setup/09/postgres/index.sql

@@ -0,0 +1,39 @@
+-- replace agg_type_agg_id
+BEGIN;
+DROP INDEX IF EXISTS eventstore.agg_type_agg_id;
+COMMIT;
+
+BEGIN;
+CREATE INDEX agg_type_agg_id ON eventstore.events (
+    instance_id
+    , aggregate_type
+    , aggregate_id
+);
+COMMIT;
+
+-- replace agg_type
+BEGIN;
+DROP INDEX IF EXISTS eventstore.agg_type;
+COMMIT;
+
+BEGIN;
+CREATE INDEX agg_type ON eventstore.events (
+    instance_id
+    , aggregate_type
+    , event_sequence
+);
+COMMIT;
+
+-- drop unused index
+BEGIN;
+DROP INDEX IF EXISTS eventstore.agg_type_seq;
+COMMIT;
+
+-- index to search event payload
+BEGIN;
+DROP INDEX IF EXISTS eventstore.event_search;
+COMMIT;
+
+BEGIN;
+CREATE INDEX event_search ON eventstore.events USING gin (event_data);
+COMMIT;