Yeah, if you put it in post and it's working that's OK. If it's only for the first post you really should have put it in thread, but the only issue is that it takes up a bit more database space.
I'm kind of surprised that it's working because I think the default when you add fields to the Thread_firstpost datamanager is to have them be thread table fields. But again, as long as it's working for you, it doesn't matter.
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