diff --git a/db/sign_in.py b/db/sign_in.py
index 52ab4ce..fb08988 100644
--- a/db/sign_in.py
+++ b/db/sign_in.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 from datetime import datetime
-from typing import Dict, Optional
+from typing import Dict, Optional, List
 
 from db.base import BaseDBOperator
 from db.connection import DBConnectionManager