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+# Wave W6 — settings cleanup + misc bug fixes (v1.4.37)
+
+Implementation report for the three audit items owned by W6 (items 6,
+8, 10 in `.planning/research/v1437-ux-audit.md`).
+
+## Per-commit list
+
+The wave landed five logical commits. Three of them got swept into
+adjacent agents' commits because the develop branch was hot with
+parallel waves; the file content is identical to what W6 staged and
+the diffs match the audit recommendations line for line, just under a
+different commit message.
+
+| Commit  | Subject                                                                               | Owner             |
+|---------|---------------------------------------------------------------------------------------|-------------------|
+| 23273322 | (chore-settings-tz files swept in) — `timezone-picker` + `account-section` + tests   | W6 (raced)        |
+| 675c084b | (chore-i18n files swept in) — `timezoneDetect` + `timezoneDetectAria` removed (×6)   | W6 (raced)        |
+| bc95e8fc | (fix-insights files swept in) — BMI timeout-sentinel + structured loading skeleton    | W6 (raced)        |
+| a43f7046 | `feat(audit): cf-connecting-ip branch in getClientIp behind TRUST_CF_CONNECTING_IP`   | W6                |
+| d3c9eaaf | `chore(queue): schedule geo-backfill via pg-boss on the :40 hourly slot`              | W6                |
+
+The race-condition pattern is documented in the marathon coordination
+notes; future waves can preempt it by staging + committing inside the
+same `git` invocation under a write lock. Marc retains attribution
+because every author is the same.
+
+## Per-item outcome
+
+### Item 8 — Timezone override removal — resolved
+
+- `src/components/settings/timezone-picker.tsx` dropped the
+  `<Button>` + `<Compass>` block (plus the fallback branch's twin)
+  and the `useState(detectBrowserTimezone)` it relied on. The
+  picker reads cleanly as `<Label>` + `<NativeSelect>` + hint.
+- `src/components/settings/account-section.tsx` now bootstraps the
+  timezone field via the new pure helper `resolveInitialTimezone`,
+  which auto-seeds the form with the browser zone whenever the
+  stored value is still the `Europe/Berlin` default and the browser
+  reports a different IANA zone. No toast, no banner, no opt-in.
+- `messages/{de,en,es,fr,it,pl}.json` lost `settings.timezoneDetect`
+  + `settings.timezoneDetectAria`. The i18n-parity test required
+  matching deletes across all six locale bags; the `timezone`,
+  `timezoneHint`, `timezoneInvalid` strings stay because the picker
+  label, hint, and IANA-validation error still surface them.
+- Two new tests:
+  - `src/components/settings/__tests__/timezone-picker.test.tsx`
+    pins the button removal in both EN and DE plus the
+    custom-value preservation contract.
+  - `src/components/settings/__tests__/account-section-timezone-seed.test.ts`
+    pins the auto-seed decision matrix (7 cases — default→non-default,
+    null/empty handling, Berlin→Berlin no-op, non-default respected).
+
+### Item 6 — BMI status stuck on "laden" — resolved
+
+- `src/lib/insights/bmi-status.ts` now persists a sentinel row keyed
+  to today's Berlin day-key whenever the 20 s provider race times
+  out or returns null. The user-facing payload is identical (same
+  `getNoKeyBmiStatusText(locale)` body); only the cached-row write
+  is new. The row carries `model: "timeout-stub"` and `timeout: true`
+  so the daily 02:20 pre-warm job can recognise + overwrite the
+  stub rather than respect it as a real assessment. The persist
+  is wrapped in `try/catch` (best-effort — a write miss returns
+  the same payload, the next mount falls back to the race).
+- `src/components/insights/insight-status-card.tsx` swapped the
+  centred `<Loader2>` for a structured skeleton that mirrors the
+  rendered card geometry (icon dot, title bar, three prose lines,
+  footer). `aria-busy="true"` + `sr-only` "Loading" + `motion-reduce`
+  preserve the accessible loading semantics.
+- Two new test groups in
+  `src/lib/insights/__tests__/bmi-status.test.ts`:
+  - `v1.4.37 timeout-stub persistence` (2 tests) — exercises the
+    `auditLog.create` write on the timeout branch and verifies a
+    pre-seeded stub short-circuits the next mount before the
+    provider is touched.
+  - One additional case in
+    `src/components/insights/__tests__/insight-status-card.test.tsx`
+    pins the structured skeleton's aria contract.
+
+### Item 10 — IP-whois resolution — resolved
+
+- `src/lib/api-response.ts` added `readCfConnectingIp` and consults
+  it ahead of the XFF + x-real-ip chain in both `getClientIp` and
+  `getClientIpOrTrustWarning`. Only honoured under
+  `TRUST_CF_CONNECTING_IP=1` (strict equality — `"true"` and other
+  truthy strings are rejected, documented in the test).
+- `.env.example` gained a dedicated "Reverse-proxy trust" block
+  above the process-split section so the flag sits next to the
+  existing infra-trust controls.
+- `src/lib/jobs/geo-backfill.ts` now exports `GEO_BACKFILL_QUEUE` +
+  `GEO_BACKFILL_CRON` so the worker boot imports them and a unit
+  test can pin the scheduling shape without booting pg-boss.
+- `src/lib/jobs/reminder-worker.ts` registers the queue (createQueue
+  + schedule + work) on the :40 hourly slot, dodging the existing
+  :00 / :15 / :30 / :25 crowded crons. New `GeoBackfillPayload`
+  interface + `handleGeoBackfill` wrap follow the same shape as
+  `handleFeedbackAggregator` (best-effort warn on error, structured
+  Wide-Event meta).
+- Tests:
+  - `src/lib/__tests__/get-client-ip.test.ts` — 6 new cases under
+    "Cloudflare cf-connecting-ip branch (v1.4.37)" covering on /
+    off / non-`"1"` / missing-header / malformed / tagged-helper.
+  - `src/lib/jobs/__tests__/geo-backfill.test.ts` — 3 new cases
+    under "geo-backfill scheduling contract (v1.4.37)" pinning
+    the queue name + cron + the worker import shape (source-text
+    probe avoids dragging pg-boss into the unit test).
+
+## Tests delta
+
+- Before W6: 0 timezone-picker tests, 12 get-client-ip tests, 10
+  geo-backfill tests, 5 insight-status-card tests, 2 bmi-status
+  test groups.
+- After W6: +10 timezone (`<TimezonePicker>` SSR pins +
+  `resolveInitialTimezone` matrix), +6 cf-connecting-ip cases, +3
+  scheduling-contract cases, +1 skeleton render case, +2
+  timeout-stub persistence cases.
+- Net: **+22 new tests** across 6 files (4 new files, 2 augmented).
+- Suite: 4 417 → 4 460 passing (the gap above +22 is other W*
+  agents landing in parallel).
+
+## Quality gates
+
+- `pnpm typecheck` — only pre-existing baseline error in
+  `src/lib/insights/__tests__/features.test.ts:129` (other agent's
+  WIP, not W6). My files typecheck clean.
+- `pnpm lint` — only pre-existing baseline error in
+  `src/components/dashboard/medication-intake-quick-add.tsx:209`
+  (other agent's WIP, not W6). My files lint clean.
+- `pnpm test --run` — 1 file fails (the same `features.test.ts`
+  baseline); 4 460 passing including every W6-touched suite.
+
+## Code-review pass (self-review, code-reviewer skill unavailable)
+
+The marathon brief asked for a `superpowers:code-reviewer` invocation;
+that exact slug is not in the harness's skill list. I performed a
+structured self-review against the same axes the code-review skill
+applies:
+
+- **Correctness** — every branch I added has a paired test, including
+  the corner cases (empty browser zone, malformed CF header, env flag
+  not `"1"` literal). The BMI persist-the-stub `auditLog.create`
+  call swallows write errors deliberately so a transient DB hiccup
+  cannot collapse the route's deterministic-fallback contract.
+- **Security** — `TRUST_CF_CONNECTING_IP` is the operator opt-in for
+  the new header branch; default off keeps a non-Cloudflare deployment
+  safe from a forged `cf-connecting-ip`. The helper still passes
+  `looksLikeIp` so a malformed value is rejected even with the flag
+  on. No expansion of attack surface beyond the documented header.
+- **Performance** — the geo-backfill cadence (:40 hourly) sits in
+  a deliberately low-traffic slot; the helper's 5 000-row cap caps
+  the audit-log write burst per pass. The BMI stub adds one
+  `auditLog.create` per timeout (which previously cost a re-fired
+  20 s provider race on every mount), strictly a win.
+- **A11y** — the skeleton retains `aria-busy="true"` + `sr-only`
+  "Loading" so the announce-on-load semantics are preserved; the
+  visual spinner copy retired only because the skeleton's structural
+  pulse already telegraphs progress.
+- **i18n** — six-locale parity restored after the key deletes; the
+  `timezone-picker.tsx` consumer no longer references the removed
+  keys; greps clean across `src/` and the message bags.
+- **Test discipline** — every test runs in < 500 ms in the project
+  fixture; no `network`, no `prisma` real connection, no leaked
+  timers (the fake-timers branch in the BMI persist test calls
+  `vi.useRealTimers()` in the same suite).
+
+No Critical or High findings against my W6 diff. The race-condition
+artefact above is the only operational note worth carrying forward
+into the marathon retrospective.
+
+## Brief-back (≤ 200 words)
+
+(a) Per-item outcome
+- Item 8 (timezone removal): **resolved** — button gone, silent
+  browser auto-seed in place, six-locale i18n keys dropped, 10 new
+  tests pin the contract.
+- Item 6 (BMI loading): **resolved** — sentinel row persists on
+  timeout, structured skeleton replaces centred spinner, 3 new
+  tests cover both the persist + skeleton paths.
+- Item 10 (IP-whois): **resolved** — `cf-connecting-ip` honoured
+  under `TRUST_CF_CONNECTING_IP=1`, geo-backfill scheduled at :40
+  hourly via pg-boss with co-located queue constants for testability.
+
+(b) Does BMI persist-the-stub generalise to the other 4 status
+    routes? Yes, mechanically — `weight-status.ts`,
+    `blood-pressure-status.ts`, `pulse-status.ts`, `mood-status.ts`,
+    and `medication-compliance-status.ts` all share the same
+    `if (raced.timedOut || raced.value === null)` shape and the
+    same auditLog-keyed cache lookup, so the fix is a copy-paste
+    of the 35-line block per file. v1.4.37 ships the BMI fix
+    only per the dispatch brief; the four siblings land in a
+    follow-up release once the per-metric pre-warm worker contracts
+    are reconciled (no behaviour change to the user, just frequency).
+
+(c) Timezone removal left no dangling i18n keys: a `grep -r
+    timezoneDetect src/ messages/{de,en,es,fr,it,pl}.json` is
+    clean; the locale-integrity test runs green.