old_contents: from addons import cron
  from addons.models import Addon
  
  class ExtraSetup(object):
  
      def _pre_setup(self):
          super(ExtraSetup, self)._pre_setup()
          cron._update_appsupport(Addon.objects.values_list('id', flat=True))
          cron._update_addons_current_version(Addon.objects.values_list('id'))
  
new_contents: from django.core.cache import cache
  
  from addons import cron
  from addons.models import Addon
  
  class ExtraSetup(object):
  
      def _pre_setup(self):
          super(ExtraSetup, self)._pre_setup()
          cron._update_appsupport(Addon.objects.values_list('id', flat=True))
          cron._update_addons_current_version(Addon.objects.values_list('id'))
          cache.clear()
  
subject: clear the cache after extra setup