Improve the traffic fetching system

shared/database/repository.py

@@ -300,8 +300,14 @@ class BaseRepository(Generic[Model, CreateSchema, UpdateSchema], ABC):
             self.session.add_all(db_objects)
             await self.session.flush()
             
-            for db_obj in db_objects:
-                await self.session.refresh(db_obj)
+            # Skip expensive individual refresh operations for large datasets
+            # Only refresh if we have a small number of objects
+            if len(db_objects) <= 100:
+                for db_obj in db_objects:
+                    await self.session.refresh(db_obj)
+            else:
+                # For large datasets, just log without refresh to prevent memory issues
+                logger.debug(f"Skipped individual refresh for large bulk operation ({len(db_objects)} records)")
             
             logger.debug(f"Bulk created {len(db_objects)} {self.model.__name__} records")
             return db_objects