Afaik, volumio2 is directly using MPD’s library.
You can find it by looking at the config file /etc/mpd.conf . It currently points to /var/lib/mpd/tag_cache.
If you use an mpd client such as Auremo, you can see and search all of your tracks because the music folders are symlinked to MPD’s music directory.
Not sure if there is a volumio DB somewhere, but I could not find it in the /data directory where everything else is kept.
Basically you want to access settings, right?
We don’t store them anymore in db, but rather in individual json config files.
You will find what you look for in
Cannot see the cif / samba network mounts in that config. Are the individual network shares stored in different json? I have a corrupt one with a space in it
which refuses to show on gui and no other shares show ass a result. So need to find the right config file.