new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('openstack', '0018_replace_security_group'),
      ]
  
      operations = [
          migrations.RemoveField(
              model_name='instance',
              name='billing_backend_id',
          ),
          migrations.RemoveField(
              model_name='instance',
              name='last_usage_update_time',
          ),
      ]
  
subject: Remove payable mixin - db migrations