I am using QuasarMX full on Jolla phone (version 2.0.1267 on latest SFOS)

my db seems corrupted because I cannot play a file anymore: there is a locked symbol attached to all songs.
I have uninstall the app but seems that something is not removed because when I re-install the app, the db is still here and all my songs are locked again.

I have tried to look for something in /usr/share/ but I do not find that f---- database

Anybody knows where to look and reset that db??
I have used that great sw for years and I am sad to be blocked now