on downloads I asked where qtdone stores user's data

the answer was: the database should be at:/home/user/.qtdone.db.sqlite

Thanks Ville but but but...
I'm lost - I've looked in /home/user/ for .qtdone.db.sqlite and can't find it!
I've used n900 fileman, case & Cute and see nothing at all, in MyDocs, root dir, anywhere
I've repopulated the .qtdone file with dummy data and can't find that too.
where oh where is it?