I don't remember exactly what I did. It was days ago, I just didn't post anything just to make sure it wasn't a placebo effect.

I can see a rm -rf .smartsearch/ as user in the history, but IIRC I dit tracker-processes -r, not sure. Anyway, by deleting smartsearch folder messages and stuff remained intact. The search application still works ok.

DISCLAIMER: This is not going to make your N9 faster, don't go deleting things every day, read my previous posts in this thread to understand what it solved. My N9 had a serious problem in that it started lagging and havind degrading functionality about a day after reboot, and that was probably caused by a corrupt database or corrupt emmc. One symptom was high CPU usage of msgsrvr intermittently.