hellohassan

you can schedule to script to regularly delete the new nodes, since node id is incremental, you can delete any node id above <last nodeid>, you can also use the filter of manually added, discovery imported

Extract from alert details link, I am using this. ${SQL:SELECT RIGHT('${N=Alerting;M=AlertDetailsUrl}',LEN('${N=Alerting;M=AlertDetailsUrl}')-CHARINDEX('AAT','${N=Alerting;M=AlertDetailsUrl}')-3)}