old_contents: from __future__ import absolute_import
  from __future__ import unicode_literals
  from corehq.preindex import CouchAppsPreindexPlugin
  from django.conf import settings
  
  CouchAppsPreindexPlugin.register('couchapps', __file__, {
      'form_question_schema': 'meta',
      'schemas_by_xmlns_or_case_type': 'meta',
      'export_instances_by_domain': 'meta',
      'export_instances_by_is_daily_saved': 'meta',
      'receiverwrapper': 'receiverwrapper',
      'users_extra': (settings.USERS_GROUPS_DB, settings.NEW_USERS_GROUPS_DB),
      'deleted_users_by_username': settings.USERS_GROUPS_DB,
      'all_docs': (
          None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta',
          settings.NEW_DOMAINS_DB, settings.NEW_APPS_DB),
      'by_domain_doc_type_date': (
          None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta',
          settings.NEW_DOMAINS_DB, settings.NEW_APPS_DB),
      'last_modified': (settings.USERS_GROUPS_DB, settings.DOMAINS_DB, settings.NEW_APPS_DB),
  
      # register these views to both the main db AND the apps db.
      'app_translations_by_popularity': (None, settings.NEW_APPS_DB),
      'exports_forms_by_app': (None, settings.NEW_APPS_DB),
      'forms_by_app_info': (None, settings.NEW_APPS_DB),
  
      # register just to the new apps db
      'apps_with_submissions': settings.NEW_APPS_DB,
      'saved_apps_auto_generated': settings.NEW_APPS_DB,
      'global_app_config_by_app_id': settings.NEW_APPS_DB,
  })
  
new_contents: from __future__ import absolute_import
  from __future__ import unicode_literals
  from corehq.preindex import CouchAppsPreindexPlugin
  from django.conf import settings
  
  CouchAppsPreindexPlugin.register('couchapps', __file__, {
      'form_question_schema': 'meta',
      'schemas_by_xmlns_or_case_type': 'meta',
      'export_instances_by_domain': 'meta',
      'export_instances_by_is_daily_saved': 'meta',
      'receiverwrapper': 'receiverwrapper',
      'users_extra': (settings.USERS_GROUPS_DB, settings.NEW_USERS_GROUPS_DB),
      'deleted_users_by_username': settings.USERS_GROUPS_DB,
      'all_docs': (
          None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta',
          settings.NEW_DOMAINS_DB, settings.NEW_APPS_DB),
      'by_domain_doc_type_date': (
          None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta',
          settings.NEW_DOMAINS_DB, settings.NEW_APPS_DB),
      'last_modified': (settings.USERS_GROUPS_DB, settings.DOMAINS_DB, settings.NEW_APPS_DB),
  
      'app_translations_by_popularity': settings.NEW_APPS_DB,
      'exports_forms_by_app': settings.NEW_APPS_DB,
      'forms_by_app_info': settings.NEW_APPS_DB,
      'apps_with_submissions': settings.NEW_APPS_DB,
      'saved_apps_auto_generated': settings.NEW_APPS_DB,
      'global_app_config_by_app_id': settings.NEW_APPS_DB,
  })
  
subject: Remove a few empty apps views from the main db