Version con fallas

backend/app/models/user.py

@@ -78,13 +78,6 @@ class User(Base):
         back_populates="assigned_to_user", 
         foreign_keys="Ticket.assigned_to"
     )
-    # Refresh tokens: especificar user_id como FK (hay 2 FKs: user_id y revoked_by)
-    refresh_tokens: Mapped[List["RefreshToken"]] = relationship(
-        "RefreshToken",
-        back_populates="user",
-        cascade="all, delete-orphan",
-        foreign_keys="[RefreshToken.user_id]"
-    )
     
     # Unique constraint por tenant
     __table_args__ = (