new_contents: from django.contrib.auth.models import User
  from django.db import models
  from django.db.models.signals import post_save
  from django.dispatch import receiver
  
  
  class Profile(models.Model):
      user = models.OneToOneField(User)
      about_me = models.TextField()
  
  
  @receiver(post_save, sender=User, dispatch_uid='create_profile')
  def cb_create_profile(sender, instance, created, raw, **kwargs):
      """
      Create an account for the newly created user.
      """
      # If we're loading a user via a fixture then `raw` will be true and in that
      # case we won't want to create a Profile to go with it
      if created and not raw:
          Profile.objects.create(user=instance)
  
subject: Add Profile model and post-save hook