old_contents: from django.db import models
  
  # Create your models here.
  
new_contents: from django.db import models
  from django.contrib.auth.models import User
  
  # Create your models here.
  
  class Message(models.Model):
      user = models.ForeignKey(User, null=True)
      # username field is useful to store guest name of unauthenticated users
      username = models.CharField(max_length=20)
      date = models.DateTimeField()
      content = models.CharField(max_length=5000)
  
subject: Add message model