Django.db.utils.IntegrityError: UNIQUE constraint failed: new__product_product.brand_id

Я готовлю проект электронной коммерции на Django. Сейчас я пытаюсь изменить некоторые вещи. Когда я выполняю команды python manage.py makemigrations и python manage.py migrate, я получаю ошибку, которую не могу понять.

error

django.db.utils.IntegrityError: UNIQUE constraint failed: new__product_product.brand_id

models.py

class Brand(models.Model):
  name = models.CharField(max_length=10)
  image = models.ImageField(upload_to='brand')
  slug = models.SlugField(max_length=15, unique=True)
  date = models.DateTimeField(auto_now_add=True)

  def __str__(self) -> str:
    return self.name

class Product(models.Model):
  name = models.CharField(max_length=100)
  category = models.ForeignKey(Category, on_delete=models.DO_NOTHING)
  main_image = models.ImageField(upload_to='product_images/%Y/%m/%d/')
  detail = models.TextField()
  keywords = models.CharField(max_length=50)
  description = models.CharField(max_length=1000)
  price = models.FloatField()
  #brand = models.CharField(max_length=50, default='Markon', verbose_name='Brand (Default: Markon)')
  brand = models.ForeignKey(Brand, on_delete=models.DO_NOTHING, default='Markon')
  sale = models.IntegerField(blank=True, null=True, verbose_name="Sale (%)")
  bestseller = models.BooleanField(default=False)
  amount = models.IntegerField(blank=True, null=True)
  available = models.BooleanField(default=True)
  stock = models.BooleanField(default=True)
  date_created = models.DateTimeField(auto_now_add=True)
  used = models.BooleanField(default=False)
  user = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True)

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