In practise, 'it depends'. It may be that it's simple enough to delete everything, or it may be that you anonymise, rather than actually delete. E.g. if you have a `users` table with:

`id, name, email_address`

You could simply blank out everything apart from `id`.

Regarding logs, it might be worth thinking about whether you actually need them to contain personally identifying information (e.g. IP addresses, usernames) - if not, just don't log them.