Change Post Cutoff (All Forums) ?

[Mink_]

My webhost went down for a full month, and when I finally managed to restore my database, all of the posts were from before the cutoff, so none of them showed... however, I have something along the lines of 30 different cats/forums, and I don't want to set the cutoff for each of them individually. Has someone cooked up an SQL query to change the cutoff date on ALL forums to -1 (Aka Show All)?

Thanks for reading! :D