geseronta
It's going to be virtually impossible via the database as you have to think about so many relations, etc. I mean just think about the attachments (files) that can be attached to each entry; some are even inline within the content HTML, etc. which you'd need to manually lookup each time. If you delete a file that's being referenced somewhere you'll get endless errors, Tickets not loading, etc. There are many more nuances to think about and to account for that it's never, ever recommended. Basically, deleting records manually via the database is literally the worst thing you can do.
Cheers.