def METHOD_NAME():
    """
    Returns a union set of valid filenames
    for log exports and users csv exports.
    These filenames are valid and will not be
    cleaned from log_exports_cleanup.
    """
    valid_logs_filenames = get_valid_logs_csv_filenames()
    valid_users_filenames = get_valid_users_csv_filenames()
    valid_filenames_set = valid_logs_filenames.union(valid_users_filenames)
    return valid_filenames_set