How to Insert Foreign Key into my user model with Abstractbaseuser

class User(AbstractBaseUser):
   password = models.CharField(max_length=128)
   username = models.CharField(unique=True, max_length=150)
   is_superuser = models.IntegerField()
   last_name = models.CharField(max_length=150)
   phone = models.CharField(max_length=20)
   email = models.CharField(max_length=254)
   date_of_birth = models.DateTimeField()
   date_joined = models.DateTimeField()
   last_login = models.DateTimeField(blank=True, null=True)
   is_staff = models.IntegerField(blank=True, null=True)
   is_active = models.IntegerField(blank=True, null=True)
   first_name = models.CharField(max_length=30, blank=True, null=True)

   
   objects = UserManager()

   USERNAME_FIELD = 'username'
   REQUIRED_FIELDS = ['last_name', 'phone', 'email', 'date_of_birth']

   def has_perm(self, perm, obj=None):
      return True

   def has_module_perms(self, app_label):
      return True

   class Meta:
      db_table = 'auth_user'

This is my user model in app.models.py 

I want to add foreign key into Class User. but i can`t ...

please help me

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