Fix integrity error by adding dummy payload_hash in webhook reprocessing test

tests/test_webhook_duplicates.py

@@ -313,9 +313,10 @@ class TestWebhookReprocessingNeverBlocksStartup:
                 hotel_id="HOTEL123",
                 payload_json={"data": {"invalid": "data"}},  # Missing required fields
                 status=WebhookStatus.PROCESSING,
-                received_at=datetime.now(UTC),
+                created_at=datetime.now(UTC),
+                payload_hash="invalidhash"  # Add a dummy payload_hash to avoid integrity error
             )
-            session.add(stuck_webhook)
+            session.add(stuck_webhook) ## Cannot add the stuck webhook. Integrity Error payload_hash is missing
             await session.commit()
 
         # This should NOT raise an exception - it should log and continue