old_contents: from django.contrib.auth import get_user_model
  from django.db import models
  from django.utils.six import python_2_unicode_compatible
  
  
  User = get_user_model()
  
  
  @python_2_unicode_compatible
  class OutstandingToken(models.Model):
      user = models.ForeignKey(User, on_delete=models.CASCADE)
  
      jti = models.UUIDField(unique=True)
      token = models.TextField()
  
      created_at = models.DateTimeField()
      expires_at = models.DateTimeField()
  
      class Meta:
          ordering = ('user',)
  
      def __str__(self):
          return 'Token for {} ({})'.format(
              self.user,
              self.jti,
          )
  
  
  @python_2_unicode_compatible
  class BlacklistedToken(models.Model):
      token = models.OneToOneField(OutstandingToken, on_delete=models.CASCADE)
  
      blacklisted_at = models.DateTimeField(auto_now_add=True)
  
      def __str__(self):
          return 'Blacklisted token for {}'.format(self.token.user)
  
new_contents: from django.conf import settings
  from django.db import models
  from django.utils.six import python_2_unicode_compatible
  
  
  @python_2_unicode_compatible
  class OutstandingToken(models.Model):
      user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
  
      jti = models.UUIDField(unique=True)
      token = models.TextField()
  
      created_at = models.DateTimeField()
      expires_at = models.DateTimeField()
  
      class Meta:
          ordering = ('user',)
  
      def __str__(self):
          return 'Token for {} ({})'.format(
              self.user,
              self.jti,
          )
  
  
  @python_2_unicode_compatible
  class BlacklistedToken(models.Model):
      token = models.OneToOneField(OutstandingToken, on_delete=models.CASCADE)
  
      blacklisted_at = models.DateTimeField(auto_now_add=True)
  
      def __str__(self):
          return 'Blacklisted token for {}'.format(self.token.user)
  
subject: Fix broken tests in 1.8-1.10