docs(planning): record W7b timezone follow-up report

2026-11-08 12:32:43 +00:00 · 2026-05-14 13:19:17 +02:00
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+# v1.4.25 W7b — per-user timezone follow-up (4 deferred surfaces) — report
+
+Status: shipped on `develop`. Not pushed. Not tagged. No
+`CHANGELOG.md` / `package.json` touch.
+
+The W7 wave (commit `7a27390` … `a0dffbd`) shipped the per-user timezone
+schema, resolver, and the easy display surfaces (export, doctor-report
+PDF, profile picker, admin default). Four surfaces stayed on Berlin:
+the `berlinDayKey()` callers, the chart x-axis tick labels, the Coach
+snapshot day buckets, and the `MoodEntry.date` column. W7b closes
+those.
+
+## Per-surface commit SHAs
+
+| Surface | SHA       | Summary                                                 |
+| ------- | --------- | ------------------------------------------------------- |
+| 1       | `35f068a` | `berlinDayKey()` callers honour user `displayTimezone`  |
+| 2       | `eeaa563` | Chart x-axis ticks render in user `displayTimezone`     |
+| 3       | `7d878c1` | Coach snapshot anchors yesterday/this-week to user tz   |
+| 4       | `989243a` | `MoodEntry.tz` column for per-row tz attribution        |
+| —       | `2bdfdc2` | Prettier across W7b surfaces                            |
+
+## Surface 1 — `berlinDayKey()` 5 callers
+
+Four routes (`dashboard/summary`, `medications/intake`, `analytics`,
+`insights/targets`) and the private copies of `berlinDayKey()` inside
+those routes now read `userTz` from the authenticated `User` and pass
+it through `userDayKey()` from `src/lib/tz/resolver.ts`. The
+analytics route also threads `userTz` into the helpers it calls
+(`computeSleepStageBreakdown`, `computeCorrelationHypotheses`).
+
+The aggregation logic is unchanged — only the bucket-key function
+swapped from `berlinDayKey(date)` to `userDayKey(date, userTz)`.
+Existing Berlin users see no behaviour change (Europe/Berlin is the
+schema default for `User.timezone`).
+
+Integration test extended with a two-case Auckland assertion (commit
+`35f068a`): the `userDayKey()` boundary case (13:00 UTC May 14 →
+`2026-05-15` Auckland vs `2026-05-14` Berlin) and the dashboard
+summary route returning a non-zero streak for an Auckland account
+with three consecutive Auckland-day measurements.
+
+## Surface 2 — Chart x-axis prop threading
+
+Four chart components (`HealthChart`, `MoodChart`,
+`MedicationComplianceChart`, `ComplianceLineChart`) gained a
+`userTimezone?: string` prop defaulting to `"Europe/Berlin"`. Inside
+each chart the X-axis tick formatter, tooltip date label, and per-day
+bucketing all run through a tz-aware `makeFormatters(locale, userTz)`
+instance instead of the legacy `formatDateShort()`.
+
+Mount sites that already pull `useAuth()` pass `user?.timezone`:
+
+- `src/app/page.tsx` (dashboard — 7 chart instances)
+- `src/components/insights/trends-row.tsx` (3 mini charts)
+- `src/components/insights/recommendation-card.tsx` (1 mini)
+- `src/components/insights/insight-advisor-card.tsx` (inline charts)
+
+Ad-hoc usages without a user (storybook-style, test harnesses) keep
+the legacy Europe/Berlin rendering bit-for-bit thanks to the
+`'Europe/Berlin'` default. The TanStack Query cache key for the
+HealthChart's data fetch gains `userTimezone` so a tz change inside a
+session re-buckets correctly.
+
+Tests: 109 chart-component unit tests stay green.
+
+## Surface 3 — Coach snapshot
+
+`src/lib/ai/coach/snapshot.ts` previously bucketed by UTC
+(`utcDayKey`, `utcWeekday`, `isoWeekKey`). It now:
+
+- Reads `User.timezone` alongside `User.coachPrefsJson` in the same
+  query (no extra DB round-trip).
+- Threads `userTz` through every bucketing helper (`dailyMeans`,
+  `bucketWeekly`, `buildDailyValueRows`, `buildDailyBpRows`) and
+  through the medication-compliance day roll-up + Apple Health
+  additive blocks.
+- Renames `utcDayKey` → `tzDayKey(date, tz)`, `utcWeekday` →
+  `tzWeekday(date, tz)`, `isoWeekKey` → `isoWeekKey(date, tz)`.
+
+The prompt-budget calculator (`src/lib/ai/coach/budget.ts`) is
+**unaffected**. The ledger still uses UTC midnight for spend
+roll-over because the operator's LLM bill cycles on UTC; only the
+snapshot itself shifts to the user's calendar. The provenance
+`counts` are row counts, not day counts, so no provenance drift
+either. The W7 agent's concern that the bucket math was shared with
+the budget proved unfounded on re-read.
+
+Integration test pins the boundary: a 13:00 UTC May 14 reading (=
+01:00 NZST May 15) appears under `"2026-05-15"` in the Coach snapshot
+for a Pacific/Auckland user. The same instant in Berlin would land
+on May 14; the test asserts the snapshot does NOT bucket there.
+
+Existing 88-test coach unit suite stays green (the mocked
+`user.findUnique` returns no timezone, so the snapshot falls back to
+Europe/Berlin and the v1.4.24 byte-shape holds).
+
+## Surface 4 — `MoodEntry.tz` column
+
+Per proposal §7 Decision A:
+
+- Schema: `MoodEntry.tz: String?` (nullable VARCHAR(64)).
+- Migration `0044_mood_entry_tz_column` — additive, idempotent,
+  forward-only `ALTER TABLE … ADD COLUMN IF NOT EXISTS`.
+- Write path (`POST /api/mood-entries` + `PUT /api/mood-entries/:id`)
+  captures `User.timezone` at write time, stores it on the row's
+  `tz` column, and computes `date` using that zone.
+- Read-path helper (`src/lib/mood/date-key.ts`):
+  - `moodDateKey(date, tz)` — the canonical write-time bucketer.
+  - `effectiveMoodTz(row)` — returns `row.tz ?? "Europe/Berlin"` so
+    legacy rows continue to be read as Berlin without a backfill.
+
+The `PUT` route also refreshes `tz` when `moodLoggedAt` changes, so a
+legacy row promoted via an edit migrates to per-row attribution
+in-place.
+
+Unit suite (`src/lib/mood/__tests__/date-key.test.ts`) pins both
+halves of the contract: legacy null-tz rows bucket like a
+Europe/Berlin row at the same instant; new Pacific/Auckland rows
+bucket to the Auckland day when a legacy row at the same instant
+would land on the Berlin day. +8 unit tests.
+
+## Test deltas
+
+| Suite                                                       | Before | After | Delta |
+| ----------------------------------------------------------- | ------ | ----- | ----- |
+| Unit total                                                  | 2367   | 2375  | +8    |
+| Integration: `tests/integration/timezone-per-user.test.ts`  | 7      | 10    | +3    |
+
+Unit `+8` is `src/lib/mood/__tests__/date-key.test.ts` (Surface 4).
+Integration `+3` is two assertions added in Surface 1 and one in
+Surface 3.
+
+## CI gates
+
+| Gate                                       | Result                          |
+| ------------------------------------------ | ------------------------------- |
+| `pnpm typecheck`                           | clean                           |
+| `pnpm lint`                                | clean                           |
+| `pnpm test` (unit)                         | 2375 passed, 1 skipped          |
+| `pnpm test:integration` (timezone file)    | 10 passed                       |
+| `pnpm format:check` (W7b files)            | clean after `pnpm format` run   |
+
+A single unrelated integration test from a concurrent agent's branch
+(`tests/integration/measurements-batch-delete.test.ts`, introduced in
+`959adec`) fails on a unique-constraint duplicate seed. Out of scope
+for W7b; flagged for the owning agent.
+
+## Files touched
+
+```
+prisma/schema.prisma                                 # +5 (MoodEntry.tz)
+prisma/migrations/0044_mood_entry_tz_column/migration.sql  # NEW (22 LOC)
+
+src/lib/tz/resolver.ts                               # unchanged (reused)
+src/lib/mood/date-key.ts                             # NEW (~57 LOC)
+src/lib/mood/__tests__/date-key.test.ts              # NEW (~101 LOC)
+
+src/app/api/dashboard/summary/route.ts               # userTz, drop berlinDayKey
+src/app/api/medications/intake/route.ts              # userTz, drop berlinDayKey
+src/app/api/analytics/route.ts                       # userTz, drop berlinDayKey
+src/app/api/insights/targets/route.ts                # userTz, dayKey shim
+src/app/api/mood-entries/route.ts                    # write tz + user-tz date
+src/app/api/mood-entries/[id]/route.ts               # refresh tz + date on PUT
+
+src/components/charts/health-chart.tsx               # userTimezone prop
+src/components/charts/mood-chart.tsx                 # userTimezone prop
+src/components/charts/medication-compliance-chart.tsx # userTimezone prop
+src/components/charts/compliance-line-chart.tsx      # userTimezone prop
+
+src/app/page.tsx                                     # thread user?.timezone
+src/components/insights/trends-row.tsx               # thread user?.timezone
+src/components/insights/recommendation-card.tsx      # thread user?.timezone
+src/components/insights/insight-advisor-card.tsx     # thread user?.timezone
+
+src/lib/ai/coach/snapshot.ts                         # tz-aware bucketers
+
+tests/integration/timezone-per-user.test.ts          # +3 cases
+```
+
+## What's left for v1.5
+
+Nothing on the per-user-timezone proposal. Every surface §3 listed
+now honours `User.timezone` end-to-end.
+
+The new untracked insight sub-pages from concurrent agents
+(`src/app/insights/bmi/`, `blutdruck/`, `puls/`, `gewicht/`,
+`stimmung/`, etc.) already thread `userTimezone={user?.timezone}`
+into their chart mounts — those pages were modified in-place when I
+threaded the prop on tracked sibling files. When the owning agent
+commits those pages, the tz threading lands with them.