fix db error on second login

ki/auth.py

@@ -24,7 +24,7 @@ def auth(username, password):
         if user is None:
             user = User(auth_id=username)
             db.session.add(user)
-
+        
         token = Token(token=str(uuid.uuid4()), user=user)
         db.session.add(token)
         db.session.commit()