Better late than never :-)
I stumbled on this thread and would like to share the possibility how to clean the traps on the SIM server. If you have lots of traps coming in the SIM server store all the traps as files under the "HP\Systems Insight Manager\traps" folder. And even if you restart the SIM or the entire server it will still pickup and process all traps in the folder until they are all done. So how to clean.
- HPSIM stop
- Rename traps folder
- Create a new traps folder
- HPSIM start
- Delete the old traps folder at you convenience
Best of luck