Performance + correctness fixes from the campaign's verified perf-correctness
audit (the two server-query findings — comprehensive-generate + boot-discovery
distinct — are deferred to a careful separate perf release):
- format-locale built a fresh Intl.DateTimeFormat/NumberFormat per call
(main-thread stall across every history list). Routed through the existing
process-wide formatter-cache keyed on locale + options (timeZone + hour-cycle
in the key); output byte-identical.
- measurement-list rendered every row twice (desktop table + mobile cards, one
CSS-hidden), unvirtualized. Now renders one layout via the SSR-safe
useIsMobile(md) hook; row markup + every data-slot unchanged.
- moodDependentKeys omitted dashboardSnapshot(), so a mood write left the
dashboard tile/score stale ~120s (server cache was already correct). Added it.
- register first-user admin was a count-then-create race (two concurrent
first sign-ups could both become ADMIN). Now an advisory lock + in-transaction
re-count makes first-admin atomic; P2002 maps to 409 instead of 500.
Regression test per fix. No migration (0243 still free).
Theme provider now initializes to the SSR-stable default and reconciles
the stored preference in a mount effect instead of reading localStorage
in the useState initializer — closes the same React #418 hydration seam
the sidebar already fixed (the inline script still handles the pre-paint
class, so no FOUC). Add a process-wide Intl formatter cache and route the
per-row workout/medication list helpers through it so a formatter is
constructed once per (locale, options) rather than once per row per
render.
Marc-André Bombeck