It's simple. Delete all of your posts and messages. Change your password to a random one which you aren't going to remember. Effectively, deleting your account. Not that it makes much difference if we are assuming that the hacker has a full dump of the site. As he will have that information regardless if you delete your account or not.
Have you ever tried to delete posts on this forum? It takes forever for each one. If you have hundreds or thousands of posts, it would be an impossible task. You'd need to write a script to do it or something.
It takes a few seconds for each post. besides, you don't have thousands of posts. If you did you would be unlikely to want to delete all of them. Allowing people to delete content with ease wouldn't benefit the forum. There would be a lot of information missing, malicious users would be abusing it and theymos would likely have to restore a lot of content deleted by malicious users.
So because _I_ don't have thousands of posts, it's irrelevant? As for "If you did you would be unlikely to want to delete all of them" you are wrong, plain and simple. There are many people with hundreds and thousands of posts that would like a simple way to delete them.
This forum is a cesspit and I no longer want any of my personally identifying information associated with it, which is why I use this account for general banter and bullshit I don't care too much about. I made the mistake of signing up with my normal user name a long time ago and participating in this forum at that time. I no longer want any of that information associated with this forum, but there's no easy way to go about deleting it. Many of us old schoolers feel the same way and most of the important people have left this forum long ago or use throw away accounts like I do. We'd rather not be associated with the scam infested troll shitfest this place has become, but we're kinda stuck.