Osma A on Nostr: Ah, you did mention that. But Mastodon Client API is insufficient - it retains ...

Ah, you did mention that. But Mastodon Client API is insufficient - it retains enforced timestamp ordering and actually makes it worse by switching from origin timestamps to receipt timestamps. There's no synchronization API for "send me what I have not seen", let alone one that would accept any sort of "and here's my preference of what to see first" parameters.