populate default values in lineage_events.created_at column

Signed-off-by: Prachi Mishra <prachi.mishra@astronomer.io>

Author: prachim-collab

api/src/main/resources/marquez/db/migration/V52__lineage_events_created_at_indexed.sql

@@ -0,0 +1,9 @@
+ALTER TABLE lineage_events ADD created_at TIMESTAMP;
+
+create index lineage_events_created_at_index on lineage_events (created_at desc);
+
+UPDATE lineage_events
+SET created_at = (event_time AT TIME ZONE 'UTC')::timestamp;
+
+ALTER TABLE lineage_events ALTER COLUMN created_at SET DEFAULT (now() AT TIME ZONE 'UTC');
+