fix parsing db and tests

iaai_scraper/storage/db.py

@@ -16,6 +16,7 @@ logger = logging.getLogger("iaai_scraper.db")
 class PersistenceService:
 
 	def __init__(self, settings: Settings) -> None:
+		# Инициализация engine и фабрики сессий.
 		self.settings = settings
 		self.engine = create_engine(settings.database.url, echo=settings.database.echo, future=True)
 		self.session_factory = sessionmaker(bind=self.engine, expire_on_commit=False, future=True)
@@ -25,6 +26,7 @@ class PersistenceService:
 
 	@contextmanager
 	def session_scope(self) -> Iterator[Session]:
+		# Единая точка commit/rollback для операций записи.
 		session = self.session_factory()
 		try:
 			yield session
@@ -36,6 +38,7 @@ class PersistenceService:
 			session.close()
 
 	def start_sync_run(self, lane: str) -> int:
+		# Создаём запись о запуске синхронизации.
 		with self.session_scope() as session:
 			run = SyncRun(status="running", lane=lane, ids_fetched=0, cars_upserted=0, cars_failed=0, images_upserted=0)
 			session.add(run)
@@ -43,6 +46,7 @@ class PersistenceService:
 			return int(run.id)
 
 	def finish_sync_run(self, run_id: int, *, status: str, ids_fetched: int, cars_upserted: int, cars_failed: int, images_upserted: int, error_summary: str | None = None) -> None:
+		# Завершаем sync_run и фиксируем итоговую статистику.
 		with self.session_scope() as session:
 			run = session.get(SyncRun, run_id)
 			if run is None:
@@ -62,11 +66,13 @@ class PersistenceService:
 
 	def upsert_car(self, record: CarRecord):
 		"""Insert/update/skip по content_hash."""
+		# Готовим payload отдельно от вложенных изображений и служебных полей.
 		payload = record.model_dump(mode="python")
 		images = payload.pop("images", [])
 		payload.pop("raw_attributes", None)
 		payload.pop("mapping_notes", None)
 		content_hash = payload.pop("content_hash", "")
+		payload["content_hash"] = content_hash
 		with self.session_scope() as session:
 			# поиск по origin_id
 			car = session.execute(select(Car).where(Car.origin_id == record.origin_id)).scalar_one_or_none()
@@ -76,7 +82,13 @@ class PersistenceService:
 				session.add(car)
 				session.flush()
 			else:
+				# Если контент не менялся, просто обновляем last_seen_at.
+				if content_hash and car.content_hash == content_hash:
+					car.last_seen_at = record.last_seen_at
+					session.flush()
+					return {"car_id": int(car.id), "images_upserted": 0, "action": "skipped"}
 				action = "updated"
+				# Обновляем поля машины и затем безопасно пересобираем картинки.
 				for key, value in payload.items():
 					setattr(car, key, value)
 				car.last_seen_at = record.last_seen_at