fix db connection

@@ -11,6 +11,7 @@ import requests
 import traceback
 from collections import Counter
 from datetime import datetime, date
+from django import db
 from django.utils import timezone
 from django.core.management import BaseCommand
 from multiprocessing import Process, Queue, Manager, Lock
@@ -731,6 +732,7 @@ class Command(BaseCommand, LoggerMixin):
     # EDMS异常：下载异常-->回队列-->邮件；上传异常-->重新上传队列-->邮件
     # 算法异常：第一道异常-->识别失败-->邮件；第二道异常-->识别失败-->邮件
     def handle(self, *args, **kwargs):
+        db.close_old_connections()
         lock = Lock()
         with Manager() as manager:
             error_list = manager.list()