chore: establish local platform baseline

migrations/000028_rtc_credential_metadata.down.sql

@@ -0,0 +1,8 @@
+BEGIN;
+
+ALTER TABLE rtc_task
+    DROP CONSTRAINT IF EXISTS rtc_credential_expiry_after_issue,
+    DROP COLUMN IF EXISTS credential_expires_at,
+    DROP COLUMN IF EXISTS credential_issued_at;
+
+COMMIT;