diff --git a/common/data_source/database_config_ui.py b/common/data_source/database_config_ui.py
index 2a684c084..c66501c1d 100644
--- a/common/data_source/database_config_ui.py
+++ b/common/data_source/database_config_ui.py
@@ -21,7 +21,7 @@ Provides UI schema and validation for database connector configuration.
 This integrates with RAGFlow's data source configuration UI.
 """
 
-from typing import Dict, List, Any, Optional
+from typing import Dict, List, Any, Optional, Tuple
 from enum import Enum
 
 
diff --git a/common/data_source/database_connector.py b/common/data_source/database_connector.py
index 0b6d45e63..46456d8d8 100644
--- a/common/data_source/database_connector.py
+++ b/common/data_source/database_connector.py
@@ -49,8 +49,6 @@ from queue import Queue, Empty
 from contextlib import contextmanager
 import base64
 from cryptography.fernet import Fernet
-from cryptography.hazmat.primitives import hashes
-from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2
 from collections import defaultdict, deque
 
 from common.data_source.interfaces import LoadConnector, PollConnector, CredentialsConnector