Why not working exampe from Django docs

https://docs.djangoproject.com/en/1.9/topics/http/sessions/#example

from django.contrib.sessions.backends.db import SessionStore as DBStore  from django.contrib.sessions.base_session import AbstractBaseSession  from django.db import models    class CustomSession(AbstractBaseSession):      account_id = models.IntegerField(null=True, db_index=True)        class Meta:          app_label = 'mysessions'        @classmethod      def get_session_store_class(cls):          return SessionStore    class SessionStore(DBStore):      @classmethod      def get_model_class(cls):          return CustomSession        def create_model_instance(self, data):          obj = super(SessionStore, self).create_model_instance(data)          try:              account_id = int(data.get('_auth_user_id'))          except (ValueError, TypeError):              account_id = None          obj.account_id = account_id          return obj

In settings registered as next:

SESSION_ENGINE = 'apps.app_sessions.backends.extended_session_store'

When I made attempt create migrations, Django - silent

In [6]: !./manage.py makemigrations  No changes detected

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