Как установить группу пользователей по умолчанию в Django

from django.contrib.auth.models import User, Group
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        instance.groups.add(Group.objects.get(name='group_name'))
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