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e867dea55f
I did an experiment to see if DenormalizedRelation would need the LastModified stuff, since it takes heavy advantage of row-level bloom filters. It turns out that there are a huge number of completely not-found rows being fetched per second that LastModified would save us from doing a round trip for. Since LastModified is shared between several relations in a single request, and CommentVote, Save, and Hide will be denormalized soon, this should give us a good amount of savings in the long run.