I guess I should ask the question, is "Once you have booted Rockbox successfully even once, you should voice your concerns in other forums" at all confusing? I thought I made it pretty clear where "installation" ends.
As to your database concern, it's the .tcd files in the .rockbox folder, but re-initializing deletes it before rebuilding it.
Use of the database falls under "Playback and Playlists" though of course, as the guidelines say, if you're at all uncertain post to General Discussion.
Could you point out where the guidelines were unclear as to whether this belonged in this section, or was it simply a case of having not read all of them yet?