feat(sqlalchemy): use session factory instead of context manager

backend/test/apps/webui/routers/test_chats.py

@@ -90,6 +90,8 @@ class TestChats(AbstractPostgresTest):
 
     def test_get_user_archived_chats(self):
         self.chats.archive_all_chats_by_user_id("2")
+        from apps.webui.internal.db import Session
+        Session.commit()
         with mock_webui_user(id="2"):
             response = self.fast_api_client.get(self.create_url("/all/archived"))
         assert response.status_code == 200