fix: db_insert_mplogx bug

apps/enm/tasks.py

@@ -60,6 +60,8 @@ def db_insert_mplogx():
         cursor.execute(
             "select id, val, tag_code, update_time from tag_value where id > %s order by id, update_time", (last_tag_id))
         rows = cursor.fetchall()  # 获取数据后保存至本地
+        if rows:
+            last_tag_id = rows[-1][0]
         MyThread(target=db_insert_mplogx_batch, args=(rows,)).start()
         update_sysconfig({'enm': {'last_tag_id': last_tag_id}})