I want to use pytest-flask-sqlalchemy with fixtures with `scope='module'` For example i have creating user: ```python @pytest.fixture(scope='module') def user(db_session): user = User( username='My user', ) db_session.add(user) db_session.commit() return user ``` Then when i testing some functions, after changing user, i get `Instance not bound to session` exception Example of changing user fixture: ```python @pytest.fixture def user_with_other_username(db_session, user): user.username='Other username' db_session.add(user) db_session.commit() return user ``` I got this exception when `user` fixture has module scope. When i set function scope i hasn`t exception