old_contents: from django.apps import AppConfig
  
  from fcm_django.settings import FCM_DJANGO_SETTINGS as SETTINGS
  
  
  class FcmDjangoConfig(AppConfig):
      name = "fcm_django"
      verbose_name = SETTINGS["APP_VERBOSE_NAME"]
  
new_contents: from django.apps import AppConfig
  
  from fcm_django.settings import FCM_DJANGO_SETTINGS as SETTINGS
  
  
  class FcmDjangoConfig(AppConfig):
      name = "fcm_django"
      verbose_name = SETTINGS["APP_VERBOSE_NAME"]
      default_auto_field = "django.db.models.BigAutoField"
  
subject: Use BigAutoField as the default ID