feat: sync latest ARR implementation

database/011_artifact_object_identity.down.sql

@@ -0,0 +1,34 @@
+-- Manual rollback for migration 011.
+-- Refuses once equal bytes have been registered under multiple object identities.
+
+BEGIN;
+
+DO $$
+BEGIN
+    IF current_database() <> 'booking_test' THEN
+        RAISE EXCEPTION
+            'ARR artifact identity rollback is allowed only in booking_test';
+    END IF;
+    IF to_regclass('ingestion.artifacts_kind_hash_idx') IS NULL THEN
+        RAISE EXCEPTION
+            'ARR artifact identity migration is not applied';
+    END IF;
+    IF EXISTS (
+        SELECT 1
+        FROM ingestion.artifacts
+        GROUP BY artifact_kind, sha256
+        HAVING count(*) > 1
+    ) THEN
+        RAISE EXCEPTION
+            'refusing rollback: repeated artifact content exists across storage identities';
+    END IF;
+END;
+$$;
+
+DROP INDEX ingestion.artifacts_kind_hash_idx;
+
+ALTER TABLE ingestion.artifacts
+    ADD CONSTRAINT artifacts_kind_hash_unique
+    UNIQUE (artifact_kind, sha256);
+
+COMMIT;