new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import models, migrations
  import jsonfield.fields
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('backup', '0002_backup_additioan_data_is_json_field'),
      ]
  
      operations = [
          migrations.RemoveField(
              model_name='backup',
              name='additional_data',
          ),
          migrations.AddField(
              model_name='backup',
              name='metadata',
              field=jsonfield.fields.JSONField(default={}, help_text='Additional information about backup, can be used for backup restoration or deletion', blank=True),
              preserve_default=True,
          ),
      ]
  
subject: Add backup model migration