I was looking through the database and was just wondering, where are the forum posts saved? I see the comments there, but not the forum posts. I get spamming time after time, and it's just easier to delete them directly from the database.
Removing posts directly from the database can be a tricky job if you're not sure what you're doing as they will be keyed to threads which are held in a separate table as well as other variables like thread_lastuser, etc.