old_contents: from django.conf import settings
  from corehq.doctypemigrations.migrator import Migrator
  
  users_migration = Migrator(
      slug='user_db_migration',
      source_db_name=None,
      target_db_name=settings.NEW_USERS_GROUPS_DB,
      doc_types=(
          'Group',
          'DeleteGroupRecord',
          'UserRole',
          'AdminUserRole',
          'CommCareUser',
          'WebUser',
          'Invitation',
          'DomainInvitation',
          'DomainRemovalRecord',
          'OrgRemovalRecord',
      )
  )
  
  
  def get_migrator_by_slug(slug):
      return Migrator.instances[slug]
  
  
  def get_migrator_slugs():
      return sorted(Migrator.instances.keys())
  
new_contents: from django.conf import settings
  from corehq.doctypemigrations.migrator import Migrator
  
  users_migration = Migrator(
      slug='user_db_migration',
      source_db_name=None,
      target_db_name=settings.NEW_USERS_GROUPS_DB,
      doc_types=(
          'Group',
          'DeleteGroupRecord',
          'UserRole',
          'AdminUserRole',
          'CommCareUser',
          'WebUser',
          'Invitation',
          'DomainInvitation',
          'DomainRemovalRecord',
          'OrgRemovalRecord',
      )
  )
  
  fixtures_migration = Migrator(
      slug='fixtures',
      source_db_name=None,
      target_db_name=settings.NEW_FIXTURES_DB,
      doc_types=(
          'FixtureDataType',
          'FixtureDataItem',
          'FixtureOwnership',
      )
  )
  
  
  def get_migrator_by_slug(slug):
      return Migrator.instances[slug]
  
  
  def get_migrator_slugs():
      return sorted(Migrator.instances.keys())
  
subject: add fixtures doctypemigration