models.py

class Key(models.Model):
    """Authentication key"""
    user = models.ForeignKey(User, editable=False, db_index=True, blank=False,
                             null=False)
    key = models.CharField(_("Lookup key"), max_length=64,
                           editable=False, db_index=True)
    hashed_secret = models.CharField(_("Hashed secret"), max_length=128,
                                     editable=False, db_index=False)
    description = models.TextField(_("Description of intended use"),
                                   blank=False)
    created = models.DateTimeField(auto_now_add=True)