How do I clear/delete Roon's Database

I know this sounds weird but what is the best method to clear or delete Roon’s history database. I am setting up a pc for a friend with roon and played a lot of stuff from my HDD that he does not have and used my tidal account. So when I hand off to him I prefer the database is clean.

Remove all the extra watched folders and leave the default one there. Make sure there is nothing in the default watched location. Close and re-open Roon. Go To Settings, Go to Setup, at the Library Maintenance. Check all that apply and then hit Clean Library. Should clean out all the old stuff. Also, make sure your Tidal account has been removed.

Thank you Daniel, I knew I could just reinstall but there had to be another way.