def get_default_streams_for_realm(realm_id: int) -> List[Stream]:
    return [default.stream for default in DefaultStream.objects.select_related().filter(realm_id=realm_id)]
def get_default_streams_for_realm(realm_id: int) -> List[Stream]:
    return [default.stream for default in DefaultStream.objects.select_related().filter(realm_id=realm_id)]