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Louis King
6804fc0b99
Fix dashboard pages stalling under rapid navigation, plus reduce the cost
of the heaviest dashboard endpoint.
SPA request cancellation: apiGet never passed an AbortSignal, so navigating
away left a page's in-flight requests running — the homepage alone fires
three (/stats + two charts), the slowest being /stats. Under rapid
navigation these piled up, holding browser connections and API threadpool
threads, so the page actually wanted queued behind stale work; a late
resolver could also clobber the new page's DOM.
- api.js: apiGet accepts an optional { signal } and forwards it to fetch;
export isAbortError().
- router.js: each navigation gets an AbortController; the previous one is
aborted at the start of _handleRoute and its signal is passed to the page
handler. A navigation-generation guard stops a superseded route from
hiding the loader for the page that replaced it.
- app.js: pageHandler swallows AbortError (an intentional cancel is not an
error).
- all 11 page modules: thread params.signal into on-load apiGet calls and
guard their catch blocks with isAbortError.
dashboard/stats consolidation: collapse the 11 sequential COUNT(*) queries
into 4 using portable conditional aggregation (func.sum(case(...))) for
nodes, messages, advertisements, and user profiles. Responses are
unchanged.
Docs: extend the v0.12 "Read-Path Query Optimisations" note and add a
"Dashboard Navigation Responsiveness" note (front-end only, no action
required).
Tests: add test_stats_time_bucket_counts asserting the active/today/24h/7d
buckets. SPA bundles are gitignored and rebuilt by the Docker/CI build, so
only committed source changed; the esbuild build was run locally to
validate the JS.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>