public static String padUserId(String userId) {
        if (!StringUtils.isNumeric(userId)) {
            return userId;
        }
        return StringUtils.leftPad(userId, 6, '0');
    }
Add 0 in front of the job number

@param userId employee ID
@return modified job number
chat2db-server/chat2db-server-tools/chat2db-server-tools-common/src/main/java/ai/chat2db/server/tools/common/util/EasyStringUtils.java