Okey i have too much time right now so here is what i did:
- I installed trackercfg
- Added one of my albums to nowatchfolders
- Opened media player and looked albums. Everything there
- Close all apps (except trackercfg)
- Tapped trackerxfgs top menu and chose save
- Tapped top menu and chose "rebuild databases"
- opened xterm and run command top
- Watched tracker processes to go from 10-60 % cpu for about ~5-7 minutes and after that thumbnailerd process kicked in and did same thing (i do have very little media on my N900 so if you have full of video&audio the tracker process could probably run for 30 minutes at least)
- After those processes went away I opened media player and there was no album what i added to no watchfolder

So...Just for you