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+# Phase W-MED — v1.4.39 medication-compliance rollup tier
+
+## Directive
+
+Eliminate the 3.2 s cold mount on
+`/api/medications/intake?scope=compliance` (`.planning/round-v1438-perf-analysis.md`
+§2.5 + §5 P4) by materialising a persistent
+`medication_compliance_rollups` ledger keyed
+`(userId, medicationId, day)` where `day` is `YYYY-MM-DD` anchored to
+the user's IANA timezone.
+
+## Scope
+
+Owned file set:
+
+- `src/lib/medications/compliance-rollups.ts` (NEW)
+- `src/lib/medications/__tests__/compliance-rollups.test.ts` (NEW)
+- `src/app/api/medications/intake/route.ts`
+- `src/app/api/medications/intake/__tests__/route.test.ts`
+- `src/app/api/medications/intake/bulk/route.ts`
+- `src/app/api/medications/[id]/intake/route.ts`
+- `src/app/api/medications/[id]/intake/[eventId]/route.ts`
+- `src/app/api/medications/[id]/intake/import/route.ts`
+- `src/app/api/medications/[id]/intake/purge/route.ts`
+- `src/app/api/ingest/medication/route.ts`
+- `src/app/api/telegram/webhook/route.ts`
+- `src/app/api/admin/backups/[id]/restore/route.ts`
+- `src/lib/jobs/reminder-worker.ts`
+
+`prisma/schema.prisma` + `prisma/migrations/0071_v1439_medication_compliance_rollups`
+were read-only inputs from the prerequisite commit `0d33f91d`.
+
+## Commits
+
+| SHA | Commit |
+|---|---|
+| `83d96a98` | `feat(medication-compliance-rollups): writer and reader helpers` |
+| `227eb69b` | `perf(medications-intake): consume compliance rollup tier` |
+| `7657b848` | `test(medication-compliance-rollups): hook, reader, and tz parity` |
+| `8e29c3ab` | `feat(medication-compliance-rollups): boot-time backfill queue` |
+
+## Test delta
+
+| Surface | Before | After |
+|---|---|---|
+| `src/lib/medications/__tests__/compliance-rollups.test.ts` | — | **+16 tests** (NEW) |
+| `src/app/api/medications/intake/__tests__/route.test.ts` | 8 | **10** (+2 cases pinning the rollup read swap + live fallback) |
+| `pnpm test src/lib src/app/api` aggregate | 3 530 | **3 547** (+17) |
+
+## Self-review
+
+- Re-read `compliance-rollups.ts` end-to-end after wiring: the writer
+  handles 23-/25-hour DST days via `startOfDayUtcInTz(nextDayKey, …)`
+  rather than a naive `+86_400_000`. Verified by inspection that
+  Berlin fall-back at 2025-10-26 produces a 25-hour window and Berlin
+  spring-forward at 2025-03-30 a 23-hour window.
+- Empty-window case deletes the rollup row rather than leaving a
+  stale `(scheduled, taken, skipped)` tuple from a now-deleted event.
+- Bulk + import paths collapse per-row hooks to one recompute per
+  distinct `(medicationId, dayKey)` pair so a 500-row batch costs at
+  most ~20-50 rollup folds rather than 500.
+- Coverage-probe fallback fires the boot-backfill enqueue in the
+  background; current request still returns a byte-identical live
+  response so no front-end can observe a hiccup during the
+  cold-mount converge.
+- Writer is best-effort wrapped in
+  `recomputeMedicationComplianceForEvent` so a populator hiccup never
+  rolls back the parent intake-event write.
+- `git status` clean across all four commits; no W-MOOD / W-SUM /
+  W-WMY / W-SINCE files staged.
+
+## Performance expectation
+
+Per the audit's §2.5 + §5 P4 estimate:
+
+- Cold mount on `/api/medications/intake?scope=compliance`:
+  **3.2 s → ~200 ms** on Marc's tenant once the boot backfill has
+  converged. The dominant cost was a pool-stall on the unbounded
+  event findMany; reading 7-30 indexed rows from the rollup tier
+  collapses to a single millisecond-class query.
+- Warm-cache hit (15-minute LRU) unchanged at < 50 ms.
+- First request post-deploy is the live-fallback path (~3.2 s) until
+  the worker boot's discovery enqueue folds the trailing 90 days;
+  subsequent requests land on the rollup tier.
+
+## Deferred
+
+- **`health-score-fast-path.ts` consumer integration** — out of
+  scope for W-MED per task directive (collision with W-WMY). The
+  per-active-medication × intake-event fan-out inside
+  `computeUserHealthScoreFastPath` (`health-score-fast-path.ts:267-303`)
+  still pays the live cost. Follow-up phase (v1.4.40 or W-MED-2)
+  should swap that branch onto `readMedicationCompliance` for the
+  same tier reuse. Estimated saving: 1-2 s on the analytics full-slice
+  cold path.
+- **Per-user-tz bucketing for non-Berlin tenants** — `day` is
+  string-anchored to the user's tz, which already removes the
+  `isNearUtc(userTz)` blocker that gates the measurement-rollup
+  fast-paths. No additional v1.5 work needed on the medication
+  tier specifically.
+- **WEEK / MONTH / YEAR compliance rollups** — Marc's audit
+  (§2 + §5 P6) flags that no consumer reads multi-granularity
+  buckets yet; the medication tier follows the same shape, daily
+  granularity only. Future quarter-window analytics could fold the
+  WEEK/MONTH/YEAR tier off the daily ledger.