Database connections kept open; a click's wait is measured (#241, #245, #246)

#241: on production, All Subscriptions' query runs in 31 ms, unread oldest-first in 30, the
feed list's count in 5, generic plans included (EXPLAIN ANALYZE, BUFFERS, read only), against
0.3-1.6 s in ipx. A new Postgres connection takes 80-330 ms to open, and a page load asks for
more than are idle: four of six slow loads came as the pool grew (3 to 6, 2 to 6, 3 to 5, 6 to
8), and 20 requests at once took a median 414 ms while the pool grew from 8 to 20. The daemon
and the directory's server now keep their whole pool open (min = max); a command such as `ipx
status`, and the tests, which share the server's 100 connections, open as they need.

#246: the page reports list_shown, the ms from asking for a list to drawing it, with the view
and filter, under the click's trace; background refreshes are not timed. Timings skip report()'s
once-a-minute limit, which is for errors in a loop. A dashboard panel and table, and the prod
check, read it.

#245: the load test's browse scenario subscribes by OPML and leaves the Directory, which is
ipx-directory's since #204, to it.

CLAUDE.md records the owner's leave to EXPLAIN (ANALYZE, BUFFERS) any query on production,
read only.

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

crates/directory/src/main.rs

@@ -92,7 +92,7 @@ async fn serve(path: &std::path::Path) -> Result<()> {
         .ok()
         .filter(|u| !u.trim().is_empty())
         .with_context(|| format!("{} is not set: the directory needs a database URL", cfg.database_url_env))?;
-    let store = Store::open(&url).await.context("opening the database")?;
+    let store = Store::open(&url, true).await.context("opening the database")?;
     let dir = Directory::new(store, vec![])?;
     let dropped = dir.set_tokens(tokens).await?;