new_contents: from django.core.management.base import BaseCommand
  from django.db.models import Q
  
  from foodsaving.conversations import tasks
  from foodsaving.conversations.models import ConversationMessage
  
  
  class Command(BaseCommand):
      """
      Run this after redis was cleared or huey crashed.
      It'll make sure that outstanding email notifications about conversation messages will get sent.
      """
  
      def handle(self, *args, **options):
          # get all latest messages
          messages = ConversationMessage.objects.exclude(
              Q(conversation_latest_message=None) & Q(thread_latest_message=None)
          )
          for message in messages:
              tasks.notify_participants.schedule(args=(message, ), delay=5 * 60)
  
subject: add command to resume notifications emails