new_contents: from django.core.management.base import BaseCommand, CommandError
  
  from studygroups.models import Application
  
  class Command(BaseCommand):
      help = 'Anonymize applications that previously opted out'
  
      def handle(self, *args, **options):
          applications = Application.objects.filter(deleted_at__isnull=False)
          print(f'About to anonymize {applications.count()} applications')
          for application in applications:
              application.anonymize()
  
subject: Add tasks to anonymize past opt outs