old_contents: from django.core.management.base import NoArgsCommand
  
  from feincms.content.rss.models import RSSContent
  
  class Command(NoArgsCommand):
      help = "Run this as a cronjob."
  
      def handle_noargs(self, **options):
          for cls in RSSContent._feincms_content_models:
              for content in cls.objects.all():
                  content.cache_content()
  
  
new_contents: from django.core.management.base import NoArgsCommand
  
  from feincms.content.rss.models import RSSContent
  
  class Command(NoArgsCommand):
      help = "Run this as a cronjob."
  
      def handle_noargs(self, **options):
          # find all concrete content types of RSSContent
          for cls in RSSContent._feincms_content_models:
              for content in cls.objects.all():
                  content.cache_content()
  
  
subject: Add small explaining note to the RSSContent updating management command