new_contents: # Generated by Django 2.2.6 on 2019-11-11 14:03
  
  from django.db import migrations
  
  
  def delete_obsolete_perms(apps, schema_editor):
      """Delete obsolete permissions from the database."""
      Permission = apps.get_model('auth', 'Permission')
      Permission.objects.filter(
          codename__in=[
              'add_collection',
              'add_entity',
              'download_collection',
              'download_entity',
              'download_data'
          ]
      ).delete()
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('flow', '0041_remove_download_perm'),
      ]
  
      operations = [
          migrations.RunPython(delete_obsolete_perms)
      ]
  
subject: Delete obsolete permissions from the database