Slice 1 of search-core (docs/discovery/05, MVP): replace date-only ordering with
ts_rank_cd relevance ranking (Npgsql RankCoverDensity) when a free-text query is
present, recency as a tiebreaker; browse-only requests (no query) keep today's
date-descending order unchanged. Upgrade plainto_tsquery -> websearch_to_tsquery
so quotes ("exact phrase"), OR, and -exclusions work as users already expect
from web search boxes.
Verified: ranking SQL semantics (plain/phrase/exclusion/ts_rank_cd score) checked
directly against a live Postgres instance, not just Npgsql's docs. Added a
regression test locking the date-order fallback path (the one behaviour testable
without a live Postgres, matching this repo's existing no-Testcontainers
convention -- see AuthEndpointsTests.TestAppFactory). All 40 tests pass; full
Release build clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cesnimda