Scaling as the number of events gets large

[palfrey]

Current design assumes all nodes have every event since the beginning of time. I’m considering options like “history nodes” which are rarer but store all events, assuming that complete rebuilds of data are relatively rare events and that the other nodes store the last “some decently large N events”. This causes a bunch of problems with the AP properties possible so far, but might be an acceptable trade-off (allowing also for very large values of N if you want a large amount of local storage)