old_contents: from __future__ import unicode_literals
  from django.db import models
  
  
  # Create your models here.
  class Certificate(models.Model):
      id = models.IntegerField(default=0, primary_key=True)
      ssl_certificate = models.CharField(max_length=200)
      ssl_key = models.CharField(max_length=200)
      domain = models.CharField(max_length=200)
      date_registered = models.DateField(auto_now=True)
      expiration_date = models.DateField()
      last_updated = models.DateField(auto_now_add=True)
  
new_contents: from __future__ import unicode_literals
  from django.db import models
  
  
  # Create your models here.
  class Certificate(models.Model):
      id = models.IntegerField(default=0, primary_key=True)
      ssl_certificate = models.CharField(max_length=255)
      ssl_key = models.CharField(max_length=200)
      domain = models.CharField(max_length=200)
      date_registered = models.DateField(auto_now=True)
      expiration_date = models.DateField()
      last_updated = models.DateField(auto_now=True)
  
subject: update certificates model