custom django user model

model.py

class UserManager(BaseUserManager):
    def create_user(self, username, password=None):
        """
        Creates and saves a User with the given username and password
        """
        if not username:
            raise ValueError('Users must have an email address')

        user = self.model(
            username=username,
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, username, password=None):
        """
        Creates and saves a User with the given username and password
        """
        user = self.create_user(username=username,
                                password=password,
                                )
        user.is_superuser = True
        user.save(using=self._db)
        return user


class User(AbstractBaseUser):
    # mandatory ('password' is automatically created by django)
    username = models.CharField(max_length=129, unique=True, db_index=True)

    # properties
    name = models.CharField(max_length=60, blank=True)
    email = models.CharField(max_length=254, blank=True)
    birth_date = models.DateField(null=True, blank=True)
    profile_image = s3_field(blank=True)
    profile_background_image = s3_field(blank=True)
    profile_message = models.CharField(max_length=100, blank=True)
    couple = models.ForeignKey(Couple, blank=True, null=True, db_index=True)

    # metadata ('last_login' is automatically created by django)
    created = models.DateTimeField(auto_now_add=True)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)
    social = JSONField(blank=True, null=True)

    # resolve django framework requirements
    objects = UserManager()
    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = []

    def get_full_name(self):
        return self.username

    def get_short_name(self):
        return self.username

    def __str__(self):
        return self.username

    @property
    def is_staff(self):
        return self.is_staff or self.is_superuser