initial commit

core/apps/accounts/signals/__init__.py

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+from .user import * # noqa

core/apps/accounts/signals/user.py

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+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from django.contrib.auth import get_user_model
+
+
+@receiver(post_save, sender=get_user_model())
+def user_signal(sender, created, instance, **kwargs):
+    if created and instance.username is None:
+        instance.username = "U%(id)s" % {"id": str(instance.id)}
+        instance.save()