old_contents: from django.db import models
  
  # Create your models here.
  
new_contents: from django.db import models
  
  
  class Message(models.Model):
      message = models.CharField(max_length=64)
      sender = models.CharField(max_length=64, db_index=True)
      country = models.CharField(max_length=2)
      price = models.FloatField()
      price_wo_vat = models.FloatField()
      currency = models.CharField(max_length=3)
      service_id = models.CharField(max_length=128)
      message_id = models.CharField(max_length=128)
      keyword = models.CharField(max_length=64)
      shortcode = models.CharField(max_length=64)
      operator = models.CharField(max_length=128)
      billing_type = models.CharField(max_length=2)
      status = models.CharField(max_length=64)
      test = models.CharField(max_length=16)
      sig = models.CharField(max_length=128)
  
subject: add message model