Normalize image galleries

tests/test_db.py

@@ -101,6 +101,36 @@ class TestPersistenceServiceIntegration(unittest.TestCase):
         self.assertEqual(len(images), 1)
         self.assertIn("imageKeys=2", images[0].fullres_image)
 
+    def test_empty_update_preserves_existing_images(self) -> None:
+        first = self._record("mobile.de:keep-images")
+        self.persistence.upsert_car(first)
+
+        update = self._record("mobile.de:keep-images", price=1500)
+        update.images = []
+        result = self.persistence.upsert_car(update)
+
+        with self.persistence.session_scope() as session:
+            images = session.execute(select(Image)).scalars().all()
+
+        self.assertEqual(result["action"], "updated")
+        self.assertEqual(result["images_upserted"], 0)
+        self.assertEqual(len(images), 1)
+
+    def test_batch_update_adds_images_when_existing_gallery_is_empty(self) -> None:
+        first = self._record("mobile.de:add-images")
+        first.images = []
+        self.persistence.upsert_car(first)
+
+        update = self._record("mobile.de:add-images", price=1500)
+        result = self.persistence.upsert_cars_batch([update])
+
+        with self.persistence.session_scope() as session:
+            images = session.execute(select(Image)).scalars().all()
+
+        self.assertEqual(result["updated"], 1)
+        self.assertEqual(result["images_upserted"], 1)
+        self.assertEqual(len(images), 1)
+
     def test_start_sync_run_marks_stale_running_runs_as_failed(self) -> None:
         first_run_id = self.persistence.start_sync_run("lane-a")
         second_run_id = self.persistence.start_sync_run("lane-b")