old_contents: 
  # Third-Party
  from django_filters.rest_framework.backends import DjangoFilterBackend
  from dry_rest_permissions.generics import DRYPermissionFiltersBase
  
  
  class CoalesceFilterBackend(DjangoFilterBackend):
      """Support Ember Data coalesceFindRequests."""
  
      def filter_queryset(self, request, queryset, view):
          raw = request.query_params.get('filter[id]')
          if raw:
              ids = raw.split(',')
              view.pagination_class = None
              queryset = queryset.filter(id__in=ids)
          return queryset
  
  
  class ScoreFilterBackend(DRYPermissionFiltersBase):
      def filter_list_queryset(self, request, queryset, view):
          """Limit all requests to superuser."""
          if request.user.is_authenticated():
              if request.user.is_staff:
                  return queryset.all()
              # else:
              #     return queryset.filter(
              #         song__appearance__entry__entity__officers__person__user=request.user,
              #     )
          return queryset.none()
  
new_contents: 
  # Third-Party
  from django_filters.rest_framework.backends import DjangoFilterBackend
  
  
  class CoalesceFilterBackend(DjangoFilterBackend):
      """Support Ember Data coalesceFindRequests."""
  
      def filter_queryset(self, request, queryset, view):
          raw = request.query_params.get('filter[id]')
          if raw:
              ids = raw.split(',')
              view.pagination_class = None
              queryset = queryset.filter(id__in=ids)
          return queryset
  
subject: Remove unused score filter backend