diff --git a/models.py b/models.py
index 0b7cc5d..86c7919 100644
--- a/models.py
+++ b/models.py
@@ -39,7 +39,6 @@ class User(UserMixin, db.Model):
 
     # Multi-Container Support (explicit primaryjoin wegen mehrerer FKs zu User)
     containers = db.relationship('UserContainer',
-                                foreign_keys=['UserContainer.user_id'],
                                 primaryjoin='User.id==UserContainer.user_id',
                                 back_populates='user',
                                 cascade='all, delete-orphan')