A least-squares slope per day over readings minutes apart explodes: three
blood-pressure readings in one sitting, the only ones of the week, fitted
thousands of mmHg per day, and the dashboard tile printed seven days of it
as the 7-day trend. The 30-day fallback had the same flaw.
A window now earns a slope only when its readings fall on at least three
UTC days whose first and last lie at least half the window apart (4 days
for the 7-day window, 15 for the 30-day one). The rule lives once in
window-confidence.ts and gates every path that publishes a windowed trend:
trendSlope (summarize and its callers), the rollup composition and the
live REGR_SLOPE fallback of the summaries slice and the comprehensive
aggregator, and the per-bucket slope of folded week, month and year
buckets. Slope, direction and confidence are present or absent together.
The fit itself stays over individual readings, as the window means do.
The parity snapshots change only where the fixture falls short of the
rule: a weekly body-fat series has two days in its 7-day window, and a
ten-day oxygen-saturation series spans nine days of its 30-day window.
The pulse and per-metric status snapshots read the latest 365 rows, which
for a dense pulse stream is a few hours, so their 30-day figures were
computed over part of one day; they now read at least the last 30 days.
The general overview read the newest 5000 rows across every type, so a
dense stream crowded the other types out within days; it now reads the
latest 365 of each type with one index descent per type. The sleep summary
in the analytics slice read one year of stage rows, so its all-time count
and its year-ago average fell short; it now walks the whole history in
chunks.
Output of `node scripts/strip-planning-tags.mjs --write`: 3,157 comment
lines in 1,308 files lose the work-item identifier at their head. Release
versions and issue references stay; nothing outside comment text
changes, which the script checks per file against a comment-free
printout. healthlog/no-planning-tags is enabled at error level with this
commit, so the tree it lands on is clean.
Quality-leap release between two HealthKit milestones. The headline is a P0 hotfix for the `/api/analytics` 500 that broke the Insights mother page for any account with more than a few thousand measurements: the six per-metric status helpers were spreading the entire numeric history into `Math.min` / `Math.max`, which trips a stack overflow once a single argument list exceeds the V8 spread cap. Both the surfaced symptom and the latent risk in five sibling helpers were folded onto a reduce-based min/max path.
Around that hotfix landed a deep polish pass: the Insights mother page now defers three below-the-fold blocks behind `next/dynamic` to trim the cold mount cost, the analytics endpoint gained a `?slice=summaries` slim slice that the per-metric sub-pages now ride, the Coach snapshot builder picked up a 60 s LRU keyed on `(userId, scope)`, the Settings shell consolidated three duplicate copies of the about / notifications / about-dropdown surfaces, the navigation strip dropped a redundant "Home" group label and a colliding "Notifications" sibling, every icon-only button on the medications and admin surfaces gained an accessible name, every Progress bar gained one too, three pages had their heading hierarchy repaired to a sequential h1 → h2 → h3, the mobile Coach FAB now hides while a chart tooltip is open so it cannot occlude the read-out, and the auth shell normalised every authenticated route to a single `max-w-screen-xl` container.
Also lands the Apple App Site Association handler at `/.well-known/apple-app-site-association` on every host that fronts the app, advertising the iOS bundle's App ID prefix (S8WDX4W5KX.dev.healthlog.app) under `webcredentials.apps` so the passkey ceremony shares cleanly between the web origin and the iOS app.
The release closes nineteen issues from a five-surface audit + a runtime bug-hunt pass, plus six follow-up tracks of polish across the affected surfaces.
Marc-André Bombeck