async def METHOD_NAME(app, id_list: List[str]):
    """
    Remove multiple diff files given a list of change IDs (`id_list`).
    :param app: the application object
    :param id_list: a list of change IDs to remove diff files for
    """
    data_path = get_config_from_app(app).data_path
    for change_id in id_list:
        otu_id, otu_version = change_id.split(".")
        path = join_diff_path(data_path, otu_id, otu_version)
        try:
            await to_thread(os.remove, path)
        except FileNotFoundError:
            pass