Foundation for bounded watch-history loading (slice B part 2). A deep
history references many monthly chunks; under a NIP-46 remote signer each
uncached chunk decrypt is a serialized published relay RPC, so decrypting
them all up front blocks the first render and risks the relay rate limit.
manager.fetch now:
- sorts chunk events newest-first by created_at, so the decrypt budget is
spent on the most recent history;
- accepts a chunkDecryptLimit option that caps how many *uncached*,
genuinely-encrypted chunks are decrypted per fetch. Cached/plaintext
chunks are always decrypted (they cost no RPC) and never count against
the limit. Default is Infinity -> no behavior change for existing
callers;
- returns deferredChunkCount so a caller can tell more history is
available on demand (re-fetching with a larger limit reuses the chunk
cache, so only the newly requested older chunks cost RPCs).
Test: two uncached nip44 chunks (newest + older) with chunkDecryptLimit:1
asserts only the newest is decrypted (1 RPC), deferredChunkCount is 1, and
only the newest chunk's items appear. Mutation-verified against both
removing the cap and removing the newest-first sort.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
