调度中心日志自动清理功能：调度中心新增配置项（"xxl.job.logretentiondays"）日志保存天数，过期日志自动清理；解决海量日志情况下日志表慢SQL问题；限制大于等于7时生效，否则关闭清理功能，默认为30；

doc/XXL-JOB官方文档.md

     ### xxl-job, i18n (default empty as chinese, "en" as english)
     xxl.job.i18n=
     
+    ## xxl-job, 调度线程池最大线程配置
+    xxl.job.triggerpool.fast.max=200
+    xxl.job.triggerpool.slow.max=100
+    
+    ### xxl-job, 日志保存天数，过期日志自动清理；限制大于等于7时生效，否则，如-1，关闭自动清理功能；
+    xxl.job.logretentiondays=30
+    
     
 
 #### 步骤二：部署项目：
 - 21、调度中心回调API服务改为restful方式；
 - 22、调度中心日志删除优化，改为分页获取ID并根据ID删除的方式，避免批量删除海量日志导致死锁问题；
 - 23、调度报表优化：新增日志报表的存储表，三天内的任务日志会以每分钟一次的频率异步同步至报表中；任务报表仅读取报表数据，极大提升加载速度；
-- 24、[ing]调度日志优化：支持设置日志保留天数，过期日志天维度记录报表，并清理；调度报表汇总实时数据和报表；
+- 24、调度中心日志自动清理功能：调度中心新增配置项（"xxl.job.logretentiondays"）日志保存天数，过期日志自动清理；解决海量日志情况下日志表慢SQL问题；限制大于等于7时生效，否则关闭清理功能，默认为30；
+
 
 
 

xxl-job-admin/src/main/java/com/xxl/job/admin/core/conf/XxlJobAdminConfig.java

     @Value("${xxl.job.triggerpool.slow.max}")
     private int triggerPoolSlowMax;
 
+    @Value("${xxl.job.logretentiondays}")
+    private int logretentiondays;
+
     // dao, service
 
     @Resource
         return triggerPoolSlowMax;
     }
 
+    public int getLogretentiondays() {
+        if (logretentiondays < 7) {
+            return -1;  // Limit greater than or equal to 7, otherwise close
+        }
+        return logretentiondays;
+    }
+
     public XxlJobLogDao getXxlJobLogDao() {
         return xxlJobLogDao;
     }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/thread/JobLogReportHelper.java

 
 import java.util.Calendar;
 import java.util.Date;
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
             @Override
             public void run() {
 
-                // monitor
+                // last clean log time
+                long lastCleanLogTime = 0;
+
+
                 while (!toStop) {
+
+                    // 1、log-report refresh: refresh log report in 3 days
                     try {
 
-                        // refresh log report in 3 days
                         for (int i = 0; i < 3; i++) {
 
                             // today
                         }
                     }
 
+                    // 2、log-clean: switch open & once each day
+                    if (XxlJobAdminConfig.getAdminConfig().getLogretentiondays()>0
+                            && System.currentTimeMillis() - lastCleanLogTime > 24*60*60*1000) {
+
+                        // expire-time
+                        Calendar expiredDay = Calendar.getInstance();
+                        expiredDay.add(Calendar.DAY_OF_MONTH, -1 * XxlJobAdminConfig.getAdminConfig().getLogretentiondays());
+                        expiredDay.set(Calendar.HOUR_OF_DAY, 0);
+                        expiredDay.set(Calendar.MINUTE, 0);
+                        expiredDay.set(Calendar.SECOND, 0);
+                        expiredDay.set(Calendar.MILLISECOND, 0);
+                        Date clearBeforeTime = expiredDay.getTime();
+
+                        // clean expired log
+                        List<Long> logIds = null;
+                        do {
+                            logIds = XxlJobAdminConfig.getAdminConfig().getXxlJobLogDao().findClearLogIds(0, 0, clearBeforeTime, 0, 1000);
+                            if (logIds!=null && logIds.size()>0) {
+                                XxlJobAdminConfig.getAdminConfig().getXxlJobLogDao().clearLog(logIds);
+                            }
+                        } while (logIds!=null && logIds.size()>0);
+
+                        // update clean time
+                        lastCleanLogTime = System.currentTimeMillis();
+                    }
+
                     try {
                         TimeUnit.MINUTES.sleep(1);
                     } catch (Exception e) {