new_contents: from django.db import models
  from django.contrib.auth.models import User
  from django.contrib.postgres.fields import JSONField
  
  # Create your models here.
  
  class Store(models.Model):
      user = models.OneToOneField(User, on_delete=models.CASCADE)
      store_name = models.CharField(max_length=30)
      tel = models.CharField(max_length=12, null=True)
      attribute = JSONField(default = dict())
      profile_image_url = models.CharField(max_length=1023, null=True)
      available = models.BooleanField(default=True)
  
      def __str__(self):
          return self.store_name
  
subject: refactor store