It takes as long as it does to finish researching whether or not it should be in the DB, the details behind it, and someone getting off their lazy ass and taking the 2 minutes it takes to add it. I've been hesitant to add things until our transition, as that should be occurring shortly, and I don't want to add the possibility of losing data in that table - not that it's really a valid concern, as we'd just need to take a new import of the table if it was missing.
EDIT: Looks valid to me. Huge thread on AssemblerGames about it with tons of details:
http://www.assemblergames...13-includes-an-unknow-one