我想通过一对一字段将Profile模型关系添加到现有的User模型中。但是我在数据库中已经有几个用户。如何在迁移新模型的同时创建这些默认关系？
例如，我已经在数据库中创建了两个用户Foo和Bar，在迁移Profile模型之后，这两个用户都应该有一个关联的Profile。

型号

class User(AbstractBaseUser, PermissionsMixin):

    email = models.EmailField(verbose_name="Email Address", max_length=255, unique=True)
    first_name = models.CharField(max_length=255)
    surname = models.CharField(max_length=255)

    is_active = models.BooleanField(default=True)
    staff = models.BooleanField(default=False)
    admin = models.BooleanField(default=False)

    objects = UserManager()

    USERNAME_FIELD = "email"
    REQUIRED_FIELDS = ["first_name", "surname"]

    def get_full_name(self):
        return f"{self.first_name} {self.surname}"

    def __str__(self):
        return self.email

    def is_staff(self):
        return self.staff

    def is_admin(self):
        return self.admin

### New model I want to create
class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    avatar = models.ImageField(default="gravatar.jpg", upload_to="avatars/")
    username = models.CharField(max_length=255, blank=True)
    phone = models.CharField(max_length=15, blank=True)

    def __str__(self):
        return f"{self.user.first_name}'s profile"