old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.contrib.contenttypes.models import ContentType
  from django.db import migrations
  
  from nodeconductor.quotas import models as quotas_models
  
  from .. import models
  
  
  def delete_backup_storage_quota_from_tenant(apps, schema_editor):
      tenant_content_type = ContentType.objects.get_for_model(models.Tenant)
      quota_name = 'backup_storage'
      quotas_models.Quota.objects.filter(name=quota_name, content_type=tenant_content_type).delete()
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('openstack', '0030_subnet_dns_nameservers'),
      ]
  
      operations = [
          migrations.RunPython(delete_backup_storage_quota_from_tenant),
      ]
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.contrib.contenttypes.models import ContentType
  from django.db import migrations
  
  from nodeconductor.quotas import models as quotas_models
  
  from .. import models
  
  
  def cleanup_tenant_quotas(apps, schema_editor):
      for obj in models.Tenant.objects.all():
          quotas_names = models.Tenant.QUOTAS_NAMES + [f.name for f in models.Tenant.get_quotas_fields()]
          obj.quotas.exclude(name__in=quotas_names).delete()
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('openstack', '0030_subnet_dns_nameservers'),
      ]
  
      operations = [
          migrations.RunPython(cleanup_tenant_quotas),
      ]
  
subject: Replace quota deletion with cleanup [WAL-433]