relay a has some set of notes relay b had another set of notes How do you sync these relays efficiently? Also from a client perspective: how do i query and download notes i don’t already have efficiently. No longer do we need to download tons of redundant data.

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You wouldn't even bother. Random sample a smaller set and average for a quick answer that's good enough for the accuracy you want at the moment. If you want to know more exactly, take a larger data set and sample that based on how much time and resources you have. No?