def test_user_updated_at_changing():
    user = User(chat_id='123456').save()

    assert user.updated_at == datetime(2030, 1, 15)

    with freeze_time('2030-06-15'):
        user.full_name = 'Oh my dummy'
        user.save()
        assert user.updated_at == datetime(2030, 6, 15)
        assert user.created_at == datetime(2030, 1, 15)