old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import models, migrations
  import sendgrid.models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('contenttypes', '__first__'),
      ]
  
      operations = [
          migrations.CreateModel(
              name='Email',
              fields=[
                  ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                  ('created', models.DateTimeField(auto_now_add=True, verbose_name='created')),
                  ('updated', models.DateTimeField(auto_now=True, verbose_name='updated')),
                  ('object_id', models.PositiveIntegerField(null=True)),
                  ('email', models.CharField(max_length=512, verbose_name='addressee')),
                  ('event', models.CharField(max_length=32, verbose_name='event type')),
                  ('timestamp', models.DateTimeField(verbose_name='timestamp')),
                  ('uuid', models.CharField(default=sendgrid.models._new_uuid, max_length=64,
                                            verbose_name='reference UUID', db_index=True)),
                  ('content_type', models.ForeignKey(to='contenttypes.ContentType', null=True)),
              ],
              options={
              },
              bases=(models.Model,),
          ),
          migrations.AlterIndexTogether(
              name='email',
              index_together=set([('content_type', 'object_id')]),
          ),
      ]
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import models, migrations
  import sendgrid.models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('contenttypes', '__first__'),
      ]
  
      operations = [
          migrations.CreateModel(
              name='Email',
              fields=[
                  ('id', models.AutoField(verbose_name='ID',
                                          serialize=False, auto_created=True, primary_key=True)),
                  ('created', models.DateTimeField(
                      auto_now_add=True, verbose_name='created')),
                  ('updated', models.DateTimeField(
                      auto_now=True, verbose_name='updated')),
                  ('object_id', models.PositiveIntegerField(null=True)),
                  ('email', models.CharField(max_length=512, verbose_name='addressee')),
                  ('event', models.CharField(max_length=32, verbose_name='event type')),
                  ('timestamp', models.DateTimeField(verbose_name='timestamp')),
                  ('uuid', models.CharField(default=sendgrid.models._new_uuid, max_length=64,
                                            verbose_name='reference UUID', db_index=True)),
                  ('content_type', models.ForeignKey(
                      to='contenttypes.ContentType', null=True, on_delete=models.CASCADE)),
              ],
              options={
              },
              bases=(models.Model,),
          ),
          migrations.AlterIndexTogether(
              name='email',
              index_together=set([('content_type', 'object_id')]),
          ),
      ]
  
subject: Add on_delete=models.CASCADE to migration