We’ve got a local db in nostr:npub1pu3vqm4vzqpxsnhuc684dp2qaq6z69sf65yte4p39spcucv5lzmqswtfch, it works well. There is an issue where we can’t tell relays which events we don’t want. If we used the strfry syncing protocol then we could efficiently only request a subset of events.

What scuttlebutt does is use a signature chain which lets you request messages with id over x sequence number.