Currently Listening and Pinned start from the person's own rows (#249)

coalesce(s.position, 0) > 5 and coalesce(s.flagged, false) hid from Postgres that a match needs
a row of entry_state, so it kept the outer join and scanned every item: Currently Listening read
all 574,000 (74,733 blocks from disk), 970 ms of its 1.3 s. s.position > 5 and s.flagged mean the
same, a missing row being neither, and let it start from the person's own rows: 2.2 ms, and
Pinned 32 ms to 2.3 (EXPLAIN ANALYZE, BUFFERS on production, read only). Unread keeps its
coalesce: no row is unread.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ipx/CHANGELOG.md

@@ -18,6 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Feeds are fetched accepting brotli and zstd as well as gzip (#244).
 - On Postgres the daemon keeps all twenty of its database connections open, so a page load no longer waits for new ones, 80-330 ms each: the feed list and item lists took 0.3-1.6 s now and then, where their queries take 5-30 ms (#241).
 
+- Currently Listening and the Pinned filter answer in a few milliseconds: they read every item on the server, 1.3 s for Currently Listening (#249).
+
 ### Added
 
 - The page's report of how long a list took to show after a click (`list_shown`, with the view and filter) is logged under that click's trace (#246).