Okidoki! I just found out that the “bb_” in the “bb_favorites” key is indeed the table prefix of your bbPress installation. That’s good news since this fixes the problems with the Post Notification plugin (if I manage to change the table prefix of a live install).
Unfortunately I was not yet able to find an answer to my second question. That’s probably where you’ll have to jump in for me.
Thanks again (in advance)!