old_contents: from django.db.models.signals import post_save, pre_delete
  from django.dispatch import receiver
  
  from .conf import settings
  from .models import UserStorage, Document
  
  
  @receiver(post_save, sender=settings.AUTH_USER_MODEL)
  def ensure_userstorage(sender, **kwargs):
      if kwargs["created"]:
          user = kwargs["instance"]
          UserStorage.objects.create(user=user, bytes_total=(1024 * 1024 * 50))
  
  
  # Receive the pre_delete signal and delete the file associated with the model instance.
  @receiver(pre_delete, sender=Document)
  def document_delete(sender, instance, **kwargs):
      # Pass false so FileField doesn't save the model.
      instance.file.delete(False)
new_contents: from django.db.models.signals import post_save, pre_delete
  from django.dispatch import receiver
  
  from .conf import settings
  from .models import UserStorage, Document
  
  
  @receiver(post_save, sender=settings.AUTH_USER_MODEL)
  def ensure_userstorage(sender, **kwargs):
      if kwargs["created"]:
          user = kwargs["instance"]
          UserStorage.objects.create(user=user, bytes_total=(1024 * 1024 * 50))
  
  
  # Receive the pre_delete signal and delete the file associated with the model instance.
  @receiver(pre_delete, sender=Document)
  def document_delete(sender, instance, **kwargs):
      # Pass false so FileField doesn't save the model.
      instance.file.delete(False)
  
subject: Add formatting.