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## Summary Adds an opt-in newest-first order to bridge search, so clients can offer "Most recent" alongside relevance. - `buzz-search`: `SearchQuery` gains `sort: SearchSort`. `Relevance` keeps the existing `ts_rank_cd` ordering. `Newest` orders hits by `created_at DESC, id`, and `page` steps through that order. Newest skips the exact-profile-lexeme prioritization, which only applies to relevance ranking. - Bridge `POST /query`: search filters accept `search_sort: "newest"`. When the field is missing or has another value, results stay in relevance order. Community scope, channel intersection and per-hit authorization are unchanged. - NIP-11 lists `buzz-search-sort` in `supported_extensions`. Clients only send the field to relays that advertise it, so they never get relevance results labelled as newest. - WebSocket NIP-50 search stays relevance-only. `NOSTR.md` documents the bridge extension. ### Related issue N/A ### Testing - New Postgres integration test `newest_sort_pages_by_time_then_id_within_scope`. It pages a channel in newest order, including an equal-timestamp tie split across a page boundary and a newer hit outside the channel scope. It checks that the pages join up in `(created_at desc, id asc)` order and that relevance still ranks the strongest match first. - Unit tests: - `bridge_search_sort_extension_selects_newest_only_when_named` - `advertises_nip_cl_and_search_sort_extensions` - Ran the buzz-search Postgres integration suite, the relay `nip11` and `bridge_search` unit tests, `cargo fmt --check`, and `cargo clippy -p buzz-search -p buzz-relay --all-targets -D warnings` on Linux. - Local relay exercised through signed `POST /query`: - NIP-11 lists `buzz-search-sort`. - Relevance and newest return different orders. - Newest pages 1–3 return 25 hits with no gaps or duplicates, including same-second ties across page boundaries. - A non-member gets no hits from a private channel; a member gets all of them. - Client integration is in a companion block/buzz-app change. It was exercised end to end against this relay through the production broker: switching sort, paging, scope changes and capability fallback. Deployment note: clients only offer newest sorting after a relay with this change advertises `buzz-search-sort`. --------- Signed-off-by: Kalvin Chau <kalvin@block.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>