docs(planning): record v1.4.20.1 hotfix wave

New `.planning/phase-v1421-hotfix-report.md` summarises the six
fixes (Daily Briefing regenerate · Coach day-level snapshot · Coach
prompt update · streaming-bubble dedup · drawer header · sources rail
scope picker), the test-count delta (2026 → 2036 unit), the
token-budget impact of the day-level snapshot (~190 → ~3000 tokens
per full-scope turn), and a recommendation to ship as a v1.4.20.1
hotfix.

STATE.md grows a Phase F section + status block tracking the six
commits on develop. Includes prettier polish across the touched
coach surfaces (sources-rail, drawer, message-thread, snapshot,
chat route).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -85,17 +85,17 @@ ships behind a feature flag and unlocks independently.
       action row + suggested-prompt strip; Daily Briefing card mounts
       full-width below the hero)
 - [x] New `src/components/insights/{hero-strip,daily-briefing,
-      suggested-prompts}.tsx`
+    suggested-prompts}.tsx`
 - [x] Extend `aiInsightResponseSchema` with `dailyBriefing`
       (`paragraph`, `keyFindings[]`)
 - [x] PROMPT_VERSION bump 4.19.0 → 4.20.0
 - [~] Apple Health gated tiles — descoped per `phase-D-v1419-product-
-      lead-review.md` decision. The 4-vitals tile row from the artboard
+    lead-review.md` decision. The 4-vitals tile row from the artboard
-      uses BP / Weight / Pulse / Mood (all data already in the app);
+  uses BP / Weight / Pulse / Mood (all data already in the app);
-      HRV / Sleep / Resting-HR tiles defer to v1.5 / iOS app. The B1
+  HRV / Sleep / Resting-HR tiles defer to v1.5 / iOS app. The B1
-      tile row itself (Vitals at-a-glance) is deferred to a later
+  tile row itself (Vitals at-a-glance) is deferred to a later
-      B-phase since it duplicates the per-section status cards below
+  B-phase since it duplicates the per-section status cards below
-      — see B1 report for the rationale.
+  — see B1 report for the rationale.
 - Detailed report: `.planning/phase-B1-v1420-report.md` (the older
   `phase-B1-report.md` is from the v1.4.18 achievements marathon)
 
@@ -108,7 +108,7 @@ commit.
 
 - [x] New `POST /api/insights/chat` SSE-streaming endpoint
 - [x] New `GET /api/insights/chat` (list) + `GET/DELETE
-      /api/insights/chat/[id]` (single + delete)
+    /api/insights/chat/[id]` (single + delete)
 - [x] New Prisma `CoachConversation` + `CoachMessage` + `CoachUsage`
       (encrypted content, GDPR cascade)
 - [x] Source-chip provenance attached to every assistant message
@@ -130,14 +130,14 @@ commit.
 - [x] New `src/lib/insights/correlations.ts` (Pearson + weekday-ANOVA;
       n >= 14 + p < 0.05 surfacing gate)
 - [x] New `src/components/insights/{correlation-card,correlation-row,
-      trends-row,trend-annotation}.tsx`
+    trends-row,trend-annotation}.tsx`
 - [x] Confidence interval via Fisher z-transform; conservative
       phrasing locked in by code-review convention
 - [x] PROMPT_VERSION 4.20.0 → 4.20.1; new `trendAnnotations` block
       on the AI response schema (nullable + optional for legacy
       payloads)
 - [x] `/api/analytics` now emits `correlations: {bpCompliance,
-      moodPulse, weightWeekday}` server-side
+    moodPulse, weightWeekday}` server-side
 - [x] `<CorrelationRow>` + `<TrendsRow>` mounted on `/insights`
       between Daily Briefing and the Advisor card
 - Detailed report: `.planning/phase-B3-report.md`
@@ -175,14 +175,14 @@ commit.
 
 Wave B closed the Insights redesign across 5 phases on `develop`:
 
-| Phase | Theme                                      | Commits   | Test count delta (unit / int) |
+| Phase | Theme                                      | Commits | Test count delta (unit / int) |
-| ----- | ------------------------------------------ | --------- | ----------------------------- |
+| ----- | ------------------------------------------ | ------- | ----------------------------- |
-| B1    | Hero strip + Daily Briefing + Suggested    | 5         | 1672 → 1753 (+81) / 67 → 67   |
+| B1    | Hero strip + Daily Briefing + Suggested    | 5       | 1672 → 1753 (+81) / 67 → 67   |
-| B2    | AI Coach drawer (B2a backend + B2b UI)     | 5 + 4     | 1753 → 1833 (+80) / 67 → 78   |
+| B2    | AI Coach drawer (B2a backend + B2b UI)     | 5 + 4   | 1753 → 1833 (+80) / 67 → 78   |
-| B3    | Correlation discovery + Trends row + AI    | 5         | 1833 → 1907 (+74) / 78 → 78   |
+| B3    | Correlation discovery + Trends row + AI    | 5       | 1833 → 1907 (+74) / 78 → 78   |
-| B4    | Weekly Report + Storyboard + Mobile passes | 5         | 1907 → 1975 (+68) / 78 → 78   |
+| B4    | Weekly Report + Storyboard + Mobile passes | 5       | 1907 → 1975 (+68) / 78 → 78   |
-| B5    | Personal Health Score                      | 5         | 1975 → 2026 (+51) / 78 → 81   |
+| B5    | Personal Health Score                      | 5       | 1975 → 2026 (+51) / 78 → 81   |
-|       | **Cumulative**                             | **29**    | **+354 / +14**                |
+|       | **Cumulative**                             | **29**  | **+354 / +14**                |
 
 Test count: 1672 → 2026 unit (+354), 67 → 81 integration (+14).
 Test files 217 → 237. typecheck clean every phase; lint
@@ -225,7 +225,7 @@ Test files 217 → 237. typecheck clean every phase; lint
       JSON-LD `softwareVersion` 1.4.20 + 3 new featureList entries)
 - [x] `docs/audit/v1420-summary.md` (release brief, `7f9ae21`)
 - [x] v1.5 plan refreshed — see `.planning/phase-D-v1420-product-
-      lead-review.md`
+    lead-review.md`
 
 ---
 
@@ -295,6 +295,45 @@ Test files 217 → 237. typecheck clean every phase; lint
   `coach-chat.test.ts` "round-trips" (not introduced by Phase-D —
   consistent re-runs pass). Phase E (release v1.4.20) unblocked.
 
+## Phase F — v1.4.20.1 hotfix
+
+Triggered by Marc's testing of the new Insights/Coach surface in
+production after v1.4.20 went live. Five issues captured in
+`feedback_v1420_post_deploy_bugs.md` — landed across six atomic
+commits on `develop`. No tag yet; maintainer decides whether to ship
+as v1.4.20.1 or bundle into v1.4.21.
+
+- [x] Daily Briefing regenerate produces a non-empty briefing
+      (`/api/insights/generate` now uses `getStrictInsightsSystemPrompt`
+      so GROUND RULE 8 reaches the model — `7921ffc`)
+- [x] Coach snapshot ships day-level readings with weekday labels
+      and a per-day medication-adherence row (`ed61b17`)
+- [x] Coach system prompt instructs the model to use the timeline
+      block for day-specific or weekday-specific questions
+      (`2143377`)
+- [x] Streaming bubble clears once the persisted twin lands —
+      message-thread render-time dedup keyed on `messageId`
+      (`f07e35b`)
+- [x] Drawer header settings cog moved to the left side so Radix
+      Sheet's close-X no longer overlaps it (`ddb2914`)
+- [x] Sources rail grows per-source checkboxes + window selector;
+      scope flows through `useSendCoachMessage` to the chat request
+      body and into `buildCoachSnapshot` (`08fd411`)
+- [x] Detailed report: `.planning/phase-v1421-hotfix-report.md`
+
+## Status block — F (v1.4.20.1 hotfix)
+
+- 2026-05-10 (post-deploy) — Hotfix complete. Six commits on
+  `develop` (`7921ffc` → `08fd411`). Test counts: 2026 → 2036 unit
+  (+10 net across snapshot + message-thread + sources-rail tests).
+  Integration tests unchanged at 81 — coach-chat.test.ts still 5/5.
+  typecheck + lint clean (13 baseline warnings unchanged). Token-
+  budget impact of the day-level snapshot: ~190 → ~3000 tokens per
+  full-scope turn; the new scope picker is the relief valve, single-
+  source narrowed turns land around 600-700 tokens. v1.4.21 should
+  watch usage and consider trimming `DAILY_TIMELINE_DAYS` from 14 to
+  10 if heavy users start hitting the 25k/day cap.
+
 ## Status block — B5 (v1.4.20)
 
 - 2026-05-10T17:45+02:00 — B5 complete. Personal Health Score

.planning/phase-v1421-hotfix-report.md

@@ -0,0 +1,167 @@
+# Phase v1.4.20.1 — hotfix report
+
+Date: 2026-05-10 (post-v1.4.20 deploy).
+Triggered by Marc's testing of the new Insights/Coach surface in
+production. Five issues captured in
+`feedback_v1420_post_deploy_bugs.md`; all six commits below land on
+`develop` with no tag — the maintainer decides whether to ship as a
+v1.4.20.1 hotfix or bundle into v1.4.21.
+
+## Issue 1 — Daily Briefing regenerate produced nothing
+
+**Diagnosis.** `/api/insights/generate` was still calling the legacy
+`getInsightsSystemPrompt` from `src/lib/insights/prompt.ts`, which
+returns the v1.4.5 `{changed, stable, drivers, …}` shape and never
+asks the model for a `dailyBriefing`. The B1 phase shipped GROUND
+RULE 8 (emit dailyBriefing when the snapshot has signal) on
+`getStrictInsightsSystemPrompt` in
+`src/lib/ai/prompts/insight-generator.ts`, but the route never
+adopted it. Re-runs from the hero strip therefore stored a payload
+with no briefing block and the `<DailyBriefing>` card painted its
+empty state forever.
+
+**Fix.** Switch the route to `getStrictInsightsSystemPrompt(locale)`.
+The route's existing `validated.success ? validated.data : parsed`
+fall-through and the strict schema's `passthrough()` mean the change
+is back-compat for cached legacy blobs. Commit `7921ffc`.
+
+## Issue 2 — Coach felt generic, couldn't answer day questions
+
+**Diagnosis.** `buildCoachSnapshot` shipped only aggregated
+statistics (mean, slope, SD, range, count) per metric. A turn that
+asked "why was BP higher on Monday?" had no day-level rows and the
+model fell back to apologetic aggregate-only phrasing — Marc's
+actual reply was "from the snapshot I cannot isolate the specific
+Monday because no day-specific individual values with weekday are
+included." Two layers of fix needed: snapshot must carry the data;
+prompt must tell the model to use it.
+
+**Primary fix (commit `ed61b17`).** Extend `buildCoachSnapshot` to
+fold in a `timeline.recent` block (one row per UTC day for the last
+14 days, each tagged with weekday) and a `timeline.weekly` block
+(ISO-week buckets covering days 15..N). Pair systolic + diastolic
+into one BP row per day; drop half-measured days so the model never
+fabricates a complement. Pull per-day medication adherence rows from
+`MedicationIntakeEvent`. Add an optional `scope` field to
+`coachChatRequestSchema` (sources + window) so a future picker can
+narrow without breaking existing clients.
+
+**Secondary fix (commit `2143377`).** Add a DAY-LEVEL READINGS
+section to both EN and DE Coach system prompts: explain the timeline
+shape; instruct the model to answer day-specific or weekday-specific
+questions out of `timeline.recent` and to cite the actual reading
+with date + weekday; tell the model to acknowledge missing days
+plainly and offer the closest available day; let older weekday
+questions fall back to `timeline.weekly`.
+
+## Issue 3 — Duplicate assistant reply in display
+
+**Diagnosis.** After SSE `done` the streaming hook keeps
+`streaming.content` populated to support the in-flight render path,
+then fires a TanStack invalidate that pulls the persisted assistant
+message into `conversation.messages`. Until the next `send` reset
+the message thread therefore rendered the assistant reply twice.
+Marc noticed the duplicate cleared on drawer close + reopen — the
+persisted state was correct, the bug was purely client-side render
+overlap.
+
+**Fix.** Suppress the streaming bubble at render time as soon as the
+persisted twin lands. The match keys on `streaming.messageId`,
+which the SSE `done` frame fills in once the row is on disk; mid-
+stream the field is null so the in-flight bubble stays visible.
+Commit `f07e35b`.
+
+## Issue 4 — Settings cog vs Sheet close-X collision
+
+**Diagnosis.** Radix Sheet paints its default close-X at absolute
+top-4 right-4. The v1.4.20 drawer header parked the settings cog
+inside the right-edge button cluster, so the close-X overlay
+visually swallowed the cog — the icon still rendered but read as
+unclickable.
+
+**Fix.** Move the cog to the left side, immediately after the
+gradient avatar, so the right edge is reserved for Radix's close-X
+alone. Add `pr-12 / sm:pr-14` padding to the header so the New chat
+button can never slide under the close-X on narrower viewports
+either. Commit `ddb2914`.
+
+## Issue 5 — Sources rail had no toggle UI
+
+**Diagnosis.** The Sources rail listed BP / Weight / Pulse / Mood /
+Compliance as a static legend. Marc wanted per-source checkboxes
+(include/exclude) plus a window selector (last 7d / 30d / 90d /
+all-time) feeding the next Coach turn.
+
+**Fix (commit `08fd411`).** Wire the controls all the way down:
+`<SourcesRail>` grows `scope` + `onScopeChange` props with real
+checkboxes (36px touch target; 60% opacity when excluded) and a
+`<Select>` for the window. `<CoachDrawer>` owns the scope state
+(resets each mount per the v1.4.20.1 plan) and forwards picked
+scope through `useSendCoachMessage` to the chat request body. The
+payload only ships when the user has narrowed away from the all-
+source last30days default — server can tell "no opinion" from
+"intentionally narrow". `buildCoachSnapshot` already accepted the
+optional `CoachScope` from the previous commit; it now flows end-
+to-end. New i18n key `insights.coach.windowLabel` in EN+DE.
+
+## Test count delta
+
+- 2026 → 2036 unit tests (+10 net).
+- 6 new tests in `src/lib/ai/coach/__tests__/snapshot.test.ts`
+  covering empty input, day-level BP rows, scope.sources filter,
+  scope.window narrowing, default scope, mood-only path.
+- 2 new tests in
+  `src/components/insights/coach-panel/__tests__/message-thread.test.tsx`
+  pinning the streaming-bubble dedup behaviour (suppress when
+  persisted twin lands; keep when still streaming).
+- 2 new tests in
+  `src/components/insights/coach-panel/__tests__/sources-rail.test.tsx`
+  pinning the checkbox count + scope-driven active state.
+
+Integration suite green; `tests/integration/coach-chat.test.ts` still
+passes 5/5 with the route changes.
+
+## Token-budget impact of the day-level snapshot
+
+Aggregates-only snapshot before: ~760 bytes JSON ≈ 190 tokens.
+Day-level snapshot after, full 5-source 30-day window: ~12 KB JSON
+≈ 3000 tokens. Delta is roughly +2800 tokens per turn. The
+`MAX_TOKENS_PER_USER_PER_DAY = 25_000` cap therefore drops a heavy
+user from ~13 turns/day to ~8 turns/day. The new scope picker is
+the relief valve: a single-source, last-7-days narrowed turn lands
+around ~600-700 tokens. v1.4.21 should consider reducing the
+`DAILY_TIMELINE_DAYS` constant from 14 → 10 if heavy users start
+hitting the cap; usage data will tell.
+
+## Dispatch recommendation
+
+Ship as **v1.4.20.1 hotfix** rather than bundling into v1.4.21.
+Reasoning:
+
+- Issue 1 is a regression of the v1.4.20 headline feature — Daily
+  Briefing was the centerpiece of the Insights redesign and it
+  hasn't been working since the tag.
+- Issue 3 is a render bug that makes every Coach interaction look
+  broken to a first-time user.
+- Issues 2, 4, 5 are quality-bar items that, taken together, fix the
+  "Coach feels impersonal" perception that undercuts the AI-Insights-
+  as-differentiator product principle.
+- The diff is contained: 8 files touched across 6 commits, no
+  schema migration, no new dependencies, no breaking API change
+  (`scope` is additive optional). All 2036 unit tests + the
+  coach-chat integration suite green.
+
+The runtime risk of holding the fixes for v1.4.21 is that production
+keeps shipping a broken Daily Briefing. A patch tag here is exactly
+what the conservative-semver memory expects.
+
+## What was not fixed
+
+Nothing was deferred — all five issues have a working fix on
+`develop`. One follow-up worth tracking in v1.4.21:
+
+- The +2800 tokens/turn snapshot delta is at the upper end of what
+  the 25k/day budget tolerates for power users. v1.4.21 should
+  watch real usage and either trim `DAILY_TIMELINE_DAYS` from 14 to
+  10, or add a "summarise-when-narrow" path that drops the
+  `timeline.weekly` block when the window is `last7days`.

src/app/api/insights/chat/route.ts

@@ -143,12 +143,7 @@ async function handleChatRequest(request: NextRequest): Promise<Response> {
       { status: 422 },
     );
   }
-  const {
+  const { conversationId, message, locale: bodyLocale, scope } = parsed.data;
-    conversationId,
-    message,
-    locale: bodyLocale,
-    scope,
-  } = parsed.data;
 
   await enforceBudget(userId);
 

src/components/insights/coach-panel/__tests__/sources-rail.test.tsx

@@ -53,9 +53,8 @@ describe("<SourcesRail>", () => {
 
   it("renders a checkbox per row + a window selector trigger", () => {
     const html = render(<SourcesRail />);
-    const checkboxes = (
+    const checkboxes = (html.match(/data-slot="coach-sources-checkbox"/g) ?? [])
-      html.match(/data-slot="coach-sources-checkbox"/g) ?? []
+      .length;
-    ).length;
     expect(checkboxes).toBe(5);
     expect(html).toContain('data-slot="coach-sources-window-trigger"');
   });

src/components/insights/coach-panel/coach-drawer.tsx

@@ -258,10 +258,7 @@ export function CoachDrawer({
           }
           sourcesRail={
             sourcesRail ?? (
-              <SourcesRail
+              <SourcesRail scope={scope} onScopeChange={setScope} />
-                scope={scope}
-                onScopeChange={setScope}
-              />
             )
           }
           thread={

src/components/insights/coach-panel/message-thread.tsx

@@ -67,9 +67,7 @@ export function MessageThread({
     messages.some((m) => m.id === streaming.messageId);
   const streamingActive =
     !streamingPersisted &&
-    (!!streaming?.inProgress ||
+    (!!streaming?.inProgress || !!streaming?.content || !!streaming?.errorCode);
-      !!streaming?.content ||
-      !!streaming?.errorCode);
 
   // Track scroll position so we don't yank the viewport when the user
   // is browsing earlier turns.

src/components/insights/coach-panel/sources-rail.tsx

@@ -82,7 +82,10 @@ export interface SourcesRailProps {
    * the controls still render but stay read-only — keeps the legend
    * surface stable for callers that don't yet wire scope through.
    */
-  onScopeChange?: (next: { sources: CoachScopeSource[]; window: CoachScopeWindow }) => void;
+  onScopeChange?: (next: {
+    sources: CoachScopeSource[];
+    window: CoachScopeWindow;
+  }) => void;
 }
 
 interface SourceRow {

src/lib/ai/coach/__tests__/snapshot.test.ts

@@ -27,7 +27,11 @@ const featuresMock = extractFeatures as unknown as ReturnType<typeof vi.fn>;
 /**
  * Helper: produce a measurement row N days before "now" at 09:00 UTC.
  */
-function daysAgo(n: number, value: number, type: string): {
+function daysAgo(
+  n: number,
+  value: number,
+  type: string,
+): {
   type: string;
   value: number;
   measuredAt: Date;

src/lib/ai/coach/snapshot.ts

@@ -53,15 +53,7 @@ const DEFAULT_SOURCES: ReadonlyArray<CoachScopeSource> = [
   "compliance",
 ];
 
-const WEEKDAY_KEYS = [
+const WEEKDAY_KEYS = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"] as const;
-  "Sun",
-  "Mon",
-  "Tue",
-  "Wed",
-  "Thu",
-  "Fri",
-  "Sat",
-] as const;
 
 function windowToDays(window: CoachScopeWindow): number {
   switch (window) {
@@ -163,7 +155,9 @@ function bucketWeekly(
   return Array.from(grouped.entries())
     .map(([weekISO, values]) => ({
       weekISO,
-      mean: Math.round((values.reduce((s, v) => s + v, 0) / values.length) * 10) / 10,
+      mean:
+        Math.round((values.reduce((s, v) => s + v, 0) / values.length) * 10) /
+        10,
       count: values.length,
     }))
     .sort((a, b) => a.weekISO.localeCompare(b.weekISO));
@@ -177,8 +171,7 @@ function buildDailyValueRows(
   const grouped = dailyMeans(recent);
   return Array.from(grouped.entries())
     .map(([date, info]) => {
-      const mean =
+      const mean = info.values.reduce((s, v) => s + v, 0) / info.values.length;
-        info.values.reduce((s, v) => s + v, 0) / info.values.length;
       return {
         date,
         weekday: utcWeekday(info.date),
@@ -206,10 +199,8 @@ function buildDailyBpRows(
   for (const [day, info] of sysByDay) {
     const dia = diaByDay.get(day);
     if (!dia) continue;
-    const sysMean =
+    const sysMean = info.values.reduce((s, v) => s + v, 0) / info.values.length;
-      info.values.reduce((s, v) => s + v, 0) / info.values.length;
+    const diaMean = dia.values.reduce((s, v) => s + v, 0) / dia.values.length;
-    const diaMean =
-      dia.values.reduce((s, v) => s + v, 0) / dia.values.length;
     out.push({
       date: day,
       weekday: utcWeekday(info.date),
@@ -310,10 +301,12 @@ export async function buildCoachSnapshot(
       : [];
 
   const byType = (t: string) =>
-    measurementRows.filter((r) => r.type === t).map((r) => ({
+    measurementRows
-      measuredAt: r.measuredAt,
+      .filter((r) => r.type === t)
-      value: r.value,
+      .map((r) => ({
-    }));
+        measuredAt: r.measuredAt,
+        value: r.value,
+      }));
 
   if (wantsBp && features.bloodPressure) {
     const sysRows = byType("BLOOD_PRESSURE_SYS");
@@ -405,9 +398,7 @@ export async function buildCoachSnapshot(
       // Per-day adherence rate within the recent window. Older days
       // collapse into a single weekly bucket.
       const recent = intakeRows.filter((r) => r.scheduledFor >= recentCutoff);
-      const olderRows = intakeRows.filter(
+      const olderRows = intakeRows.filter((r) => r.scheduledFor < recentCutoff);
-        (r) => r.scheduledFor < recentCutoff,
-      );
       const recentByDay = new Map<
         string,
         { date: Date; total: number; taken: number }