Remember which search terms I have already looked at and decided to keep

When I review search terms I make three kinds of decision: this is junk (add a negative), this is good (maybe add it as a keyword), and this is fine as it's (do nothing). The first two leave a trace. The third leaves nothing, so next month the same term is back in the list looking exactly as unreviewed as it did before, and I make the same decision again. Across a big account that's most of my review time spent re-deciding things I already decided. What I would like is for "I have looked at this and it's fine" to be a recordable outcome, so the list I see is the terms I haven't yet judged rather than every term that exists. Ideally with an expiry, because a term I judged fine at 3 clicks might deserve another look at 300.