diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47aa92854..21e9d0264 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,25 @@
 
 ## [Unreleased]
 
+## [1.32.12] — 2026-07-24
+
+A mood you log late in the evening now lands on the day you logged it, in your
+own timezone, both on the dashboard and in the Coach's mood view.
+
+- **Your late-night mood stays on the right day.** The pre-computed mood history
+  used to file each entry by its UTC date, so a mood logged after dark in a
+  timezone that runs ahead of or behind UTC could jump to the neighbouring day
+  once the nightly rebuild ran. Every mood now files under the calendar day it
+  was logged in your own timezone, matching the raw entry list.
+- **The dashboard and the Coach agree.** The daily mood series behind the
+  dashboard tile and the Coach's mood view now read the same day for an entry as
+  the entry list does, so a value no longer shifts by a day when the faster
+  pre-computed path takes over from the live one.
+- **The correction applies itself.** On upgrade the pre-computed mood history is
+  cleared and rebuilt under the corrected keying. While it rebuilds, mood reads
+  fall back to the live calculation, which was already correct, so there is no
+  window where the wrong day is shown.
+
 ## [1.32.11] — 2026-07-24
 
 Signing in to the iOS app on a self-hosted domain now runs through your own web
diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 9f3624014..6d294958d 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.32.11
+  version: 1.32.12
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.
 
diff --git a/package.json b/package.json
index 0104458fe..7263d8e93 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.32.11",
+  "version": "1.32.12",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "PolyForm-Noncommercial-1.0.0",
   "homepage": "https://healthlog.dev",
diff --git a/prisma/migrations/0269_rebuild_mood_rollups_tz/migration.sql b/prisma/migrations/0269_rebuild_mood_rollups_tz/migration.sql
new file mode 100644
index 000000000..01b679aab
--- /dev/null
+++ b/prisma/migrations/0269_rebuild_mood_rollups_tz/migration.sql
@@ -0,0 +1,18 @@
+-- v1.32.12 — mood rollup timezone re-key.
+--
+-- The mood rollup writer used to bucket on the UTC truncation of
+-- `mood_logged_at`, so a mood logged late in the evening (or after
+-- midnight) in a non-UTC timezone landed on the wrong calendar day.
+-- The writer now keys every bucket on the canonical per-row
+-- `mood_entries."date"` label instead, byte-identical to the live
+-- fallback and to the day the user logged the mood in their own zone.
+--
+-- Data-only migration: no schema change. `MoodEntryRollup` is a derived
+-- cache, fully reconstructible from `mood_entries` at any time. Emptying
+-- the table drops every stale UTC-keyed row; the app then serves correct
+-- data through the live `date`-keyed fallback until the rollups are
+-- rebuilt, and the boot-time full-backfill worker
+-- (`enqueueBootTimeMoodRollupBackfill` → delete-then-refold) re-mints
+-- every mood-owning user's buckets under the new keying. No mood data is
+-- touched.
+DELETE FROM "mood_entry_rollups";
diff --git a/public/sw.js b/public/sw.js
index 00e69c754..64fa96d62 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -36,7 +36,7 @@ try {
 // v1.4.38.4 → v1.4.42. Do not hand-edit; bump `package.json` and rebuild.
 const CACHE_VERSION =
   (typeof self !== "undefined" && self.__APP_VERSION__) ||
-  /* @sw-version-fallback */ "v1.32.11";
+  /* @sw-version-fallback */ "v1.32.12";
 const STATIC_CACHE = `healthlog-static-${CACHE_VERSION}`;
 const PAGE_CACHE = `healthlog-pages-${CACHE_VERSION}`;
 // v1.18.6 — read-only data cache for a curated allowlist of safe GET `/api/*`
diff --git a/src/app/api/integrations/moodlog/webhook/route.ts b/src/app/api/integrations/moodlog/webhook/route.ts
index 7d5445811..6dc89846e 100644
--- a/src/app/api/integrations/moodlog/webhook/route.ts
+++ b/src/app/api/integrations/moodlog/webhook/route.ts
@@ -133,7 +133,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
     // webhook 200 response (the rollup is a cache tier, the source-of-
     // truth is the mood_entries write that already committed).
     try {
-      await recomputeMoodBucketsForEntry(user.id, moodLoggedAt);
+      await recomputeMoodBucketsForEntry(user.id, entry.date);
     } catch (rollupErr) {
       getEvent()?.addWarning(
         "Mood rollup recompute failed: " +
diff --git a/src/app/api/mood-entries/[id]/route.ts b/src/app/api/mood-entries/[id]/route.ts
index 7e7639a1d..48269ba1a 100644
--- a/src/app/api/mood-entries/[id]/route.ts
+++ b/src/app/api/mood-entries/[id]/route.ts
@@ -247,13 +247,16 @@ export const PUT = apiHandler(
     // (user, day) tuples) so we fan them out in parallel. Best-
     // effort: rollup failures must not surface as 5xx.
     try {
-      const targets = new Set<number>([entry.moodLoggedAt.getTime()]);
-      if (existing.moodLoggedAt.getTime() !== entry.moodLoggedAt.getTime()) {
-        targets.add(existing.moodLoggedAt.getTime());
+      // v1.32.12 — key on the `date` label. When the update moved the
+      // entry across a local-day boundary its `date` changed, so both
+      // the old and new labels need a recompute (independent buckets).
+      const targets = new Set<string>([entry.date]);
+      if (existing.date !== entry.date) {
+        targets.add(existing.date);
       }
       await Promise.all(
-        Array.from(targets).map((t) =>
-          recomputeMoodBucketsForEntry(user.id, new Date(t)),
+        Array.from(targets).map((label) =>
+          recomputeMoodBucketsForEntry(user.id, label),
         ),
       );
     } catch (rollupErr) {
@@ -324,7 +327,7 @@ export const DELETE = apiHandler(
     // deleted entry's bucket; the recompute helper handles the
     // "now-empty day → drop the rollup row" branch internally.
     try {
-      await recomputeMoodBucketsForEntry(user.id, existing.moodLoggedAt);
+      await recomputeMoodBucketsForEntry(user.id, existing.date);
     } catch (rollupErr) {
       annotate({
         meta: {
diff --git a/src/app/api/mood-entries/bulk-delete/__tests__/route.test.ts b/src/app/api/mood-entries/bulk-delete/__tests__/route.test.ts
index c81a4d768..f90b842bc 100644
--- a/src/app/api/mood-entries/bulk-delete/__tests__/route.test.ts
+++ b/src/app/api/mood-entries/bulk-delete/__tests__/route.test.ts
@@ -110,11 +110,11 @@ describe("POST /api/mood-entries/bulk-delete", () => {
   });
 
   it("collapses the rollup recompute to the unique day set, not per-row", async () => {
-    // 3 deleted rows across 2 distinct UTC days → 2 recomputes.
+    // 3 deleted rows across 2 distinct date labels → 2 recomputes.
     vi.mocked(prisma.moodEntry.findMany).mockResolvedValue([
-      { moodLoggedAt: new Date("2026-01-01T08:00:00Z") },
-      { moodLoggedAt: new Date("2026-01-01T22:00:00Z") },
-      { moodLoggedAt: new Date("2026-01-02T09:00:00Z") },
+      { date: "2026-01-01" },
+      { date: "2026-01-01" },
+      { date: "2026-01-02" },
     ] as never);
     vi.mocked(prisma.moodEntry.updateMany).mockResolvedValue({
       count: 3,
diff --git a/src/app/api/mood-entries/bulk-delete/route.ts b/src/app/api/mood-entries/bulk-delete/route.ts
index 4f0616be3..96e8c301b 100644
--- a/src/app/api/mood-entries/bulk-delete/route.ts
+++ b/src/app/api/mood-entries/bulk-delete/route.ts
@@ -75,7 +75,7 @@ async function postBulkDelete(request: NextRequest): Promise<Response> {
   // it is from the mutation below — no existence leak.
   const affected = await prisma.moodEntry.findMany({
     where: { id: { in: ids }, userId: user.id, deletedAt: null },
-    select: { moodLoggedAt: true },
+    select: { date: true },
   });
 
   // Soft-delete (tombstone) in one statement. The `where` pins `userId`
@@ -101,21 +101,19 @@ async function postBulkDelete(request: NextRequest): Promise<Response> {
     // v1.4.34 IW-G — bust per-user mood + achievements + analytics caches.
     invalidateUserMood(user.id);
 
-    // v1.4.39 W-MOOD — collapse the deleted rows to the unique
-    // `(user, dayStart)` set BEFORE recomputing so a bulk delete spanning
-    // one day fires one recompute, not one per row. Best-effort — a
-    // populator hiccup never fails the user's delete.
-    const touchedDayStarts = new Set<number>();
+    // v1.32.12 — collapse the deleted rows to the unique set of `date`
+    // labels BEFORE recomputing so a bulk delete spanning one local day
+    // fires one recompute, not one per row, and keys byte-identically to
+    // the stored `MoodEntry.date`. Best-effort — a populator hiccup
+    // never fails the user's delete.
+    const touchedLabels = new Set<string>();
     for (const row of affected) {
-      const d = row.moodLoggedAt;
-      touchedDayStarts.add(
-        Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()),
-      );
+      touchedLabels.add(row.date);
     }
     try {
       await Promise.all(
-        Array.from(touchedDayStarts).map((t) =>
-          recomputeMoodBucketsForEntry(user.id, new Date(t)),
+        Array.from(touchedLabels).map((label) =>
+          recomputeMoodBucketsForEntry(user.id, label),
         ),
       );
     } catch (rollupErr) {
diff --git a/src/app/api/mood-entries/bulk/route.ts b/src/app/api/mood-entries/bulk/route.ts
index 0ff709b63..9076ab551 100644
--- a/src/app/api/mood-entries/bulk/route.ts
+++ b/src/app/api/mood-entries/bulk/route.ts
@@ -432,23 +432,20 @@ async function postBulk(request: NextRequest): Promise<Response> {
   // unique `(user, dayStart)` set first to bound the recompute count.
   // Best-effort: rollup failures must not surface as 5xx.
   if (inserted > 0 || duplicates > 0) {
-    const touchedDayStarts = new Set<number>();
+    // v1.32.12 — collapse to the unique set of `date` labels touched by
+    // this batch (the same per-row `moodDateKey` the insert used), so
+    // the rollup keys byte-identically to the stored `MoodEntry.date`.
+    const touchedLabels = new Set<string>();
     for (let i = 0; i < entries.length; i++) {
       const status = results[i]?.status;
       if (status === "inserted" || status === "duplicate") {
-        const d = entries[i].moodLoggedAt;
-        const dayStart = Date.UTC(
-          d.getUTCFullYear(),
-          d.getUTCMonth(),
-          d.getUTCDate(),
-        );
-        touchedDayStarts.add(dayStart);
+        touchedLabels.add(moodDateKey(entries[i].moodLoggedAt, tz));
       }
     }
     try {
       await Promise.all(
-        Array.from(touchedDayStarts).map((t) =>
-          recomputeMoodBucketsForEntry(user.id, new Date(t)),
+        Array.from(touchedLabels).map((label) =>
+          recomputeMoodBucketsForEntry(user.id, label),
         ),
       );
     } catch (rollupErr) {
diff --git a/src/app/api/mood-entries/restore/__tests__/route.test.ts b/src/app/api/mood-entries/restore/__tests__/route.test.ts
index 51772d529..7ff413f63 100644
--- a/src/app/api/mood-entries/restore/__tests__/route.test.ts
+++ b/src/app/api/mood-entries/restore/__tests__/route.test.ts
@@ -111,11 +111,11 @@ describe("POST /api/mood-entries/restore", () => {
   });
 
   it("collapses the mood rollup recompute to the unique day set, not per-row", async () => {
-    // 3 restored rows across 2 distinct UTC days → 2 recomputes.
+    // 3 restored rows across 2 distinct date labels → 2 recomputes.
     vi.mocked(prisma.moodEntry.findMany).mockResolvedValue([
-      { moodLoggedAt: new Date("2026-01-01T08:00:00Z") },
-      { moodLoggedAt: new Date("2026-01-01T20:00:00Z") },
-      { moodLoggedAt: new Date("2026-01-02T09:00:00Z") },
+      { date: "2026-01-01" },
+      { date: "2026-01-01" },
+      { date: "2026-01-02" },
     ] as never);
     vi.mocked(prisma.moodEntry.updateMany).mockResolvedValue({
       count: 3,
diff --git a/src/app/api/mood-entries/restore/route.ts b/src/app/api/mood-entries/restore/route.ts
index fd4ab345b..3146061c3 100644
--- a/src/app/api/mood-entries/restore/route.ts
+++ b/src/app/api/mood-entries/restore/route.ts
@@ -76,7 +76,7 @@ async function postRestore(request: NextRequest): Promise<Response> {
   // is from the mutation below — no existence leak.
   const affected = await prisma.moodEntry.findMany({
     where: { id: { in: ids }, userId: user.id, deletedAt: { not: null } },
-    select: { moodLoggedAt: true },
+    select: { date: true },
   });
 
   // Un-tombstone in one statement. The `where` pins `userId` so a forged
@@ -102,20 +102,18 @@ async function postRestore(request: NextRequest): Promise<Response> {
     // Bust per-user mood + achievements + analytics caches.
     invalidateUserMood(user.id);
 
-    // Collapse the restored rows to the unique `(user, dayStart)` set
-    // BEFORE recomputing — mirrors the bulk-delete path. Best-effort: a
+    // v1.32.12 — collapse the restored rows to the unique set of `date`
+    // labels BEFORE recomputing — mirrors the bulk-delete path and keys
+    // byte-identically to the stored `MoodEntry.date`. Best-effort: a
     // populator hiccup never fails the user's restore.
-    const touchedDayStarts = new Set<number>();
+    const touchedLabels = new Set<string>();
     for (const row of affected) {
-      const d = row.moodLoggedAt;
-      touchedDayStarts.add(
-        Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()),
-      );
+      touchedLabels.add(row.date);
     }
     try {
       await Promise.all(
-        Array.from(touchedDayStarts).map((t) =>
-          recomputeMoodBucketsForEntry(user.id, new Date(t)),
+        Array.from(touchedLabels).map((label) =>
+          recomputeMoodBucketsForEntry(user.id, label),
         ),
       );
     } catch (rollupErr) {
diff --git a/src/app/api/mood-entries/route.ts b/src/app/api/mood-entries/route.ts
index 47725d78d..11820d872 100644
--- a/src/app/api/mood-entries/route.ts
+++ b/src/app/api/mood-entries/route.ts
@@ -334,7 +334,7 @@ async function postMoodEntry(request: NextRequest) {
     // Best-effort: a failure here must not surface as a 5xx to the
     // user, the rollup is a cache tier, not a write-path invariant.
     try {
-      await recomputeMoodBucketsForEntry(user.id, moodLoggedAt);
+      await recomputeMoodBucketsForEntry(user.id, date);
     } catch (rollupErr) {
       annotate({
         meta: {
diff --git a/src/lib/analytics/mood-series.ts b/src/lib/analytics/mood-series.ts
index 6076602f4..676eb62e4 100644
--- a/src/lib/analytics/mood-series.ts
+++ b/src/lib/analytics/mood-series.ts
@@ -43,12 +43,14 @@ export interface MoodDailySeries {
 }
 
 /**
- * Format a UTC `Date` as a YYYY-MM-DD label. The rollup tier anchors on
- * UTC midnight (same convention as the measurement rollup tier). For
- * tenants within ±3 h of UTC (Berlin year-round) the label agrees with
- * the local wall-clock day on every entry whose timestamp doesn't
- * straddle the UTC boundary — i.e. every realistic mood log. v1.5
- * per-user-tz bucketing (audit P7) closes the DST fall-back-night gap.
+ * Format a rollup `bucketStart` as a YYYY-MM-DD label from its UTC
+ * calendar parts. Since v1.32.12 the mood rollup writer stores
+ * `bucketStart` as the UTC-midnight encoding of the canonical per-row
+ * `MoodEntry.date` label, so reading the UTC parts back yields exactly
+ * that label — byte-identical to the live `entry.date` fallback below,
+ * across every timezone and DST boundary. (Before v1.32.12 the writer
+ * UTC-truncated `mood_logged_at`, which shifted the day for any local
+ * mood straddling the UTC boundary; that gap is now closed.)
  */
 function utcDayLabel(d: Date): string {
   const yyyy = d.getUTCFullYear();
diff --git a/src/lib/jobs/reminder/register-rollup.ts b/src/lib/jobs/reminder/register-rollup.ts
index 2c51a2c10..1b9a0ae01 100644
--- a/src/lib/jobs/reminder/register-rollup.ts
+++ b/src/lib/jobs/reminder/register-rollup.ts
@@ -498,8 +498,16 @@ export async function registerRollupQueues(
       for (const job of jobs) {
         const { userId } = job.data;
         try {
-          const { rowsUpserted, durationMs } =
-            await recomputeUserMoodRollups(userId);
+          // v1.32.12 — delete-then-refold. Empties the user's rollup
+          // rows before refolding so the boot backfill is self-cleaning
+          // against any row minted under an older keying (e.g. a
+          // rolling-deploy old-container write during the swap window).
+          // The brief empty window serves correct data via the live
+          // `entry.date` fallback.
+          const { rowsUpserted, durationMs } = await recomputeUserMoodRollups(
+            userId,
+            { replace: true },
+          );
           workerLog(
             "info",
             `[mood-rollup-full-backfill] user=${userId} rows=${rowsUpserted} duration=${durationMs}ms`,
diff --git a/src/lib/mcp/writes.ts b/src/lib/mcp/writes.ts
index d27114742..daa79b28e 100644
--- a/src/lib/mcp/writes.ts
+++ b/src/lib/mcp/writes.ts
@@ -563,7 +563,7 @@ export async function logMcpMood(input: {
 
   // Best-effort rollup refresh — a cache tier, never a write-path invariant.
   try {
-    await recomputeMoodBucketsForEntry(input.userId, moodLoggedAt);
+    await recomputeMoodBucketsForEntry(input.userId, date);
   } catch (rollupErr) {
     getEvent()?.addMeta(
       "mcp_mood_rollup_failed",
diff --git a/src/lib/mood/create-from-telegram.ts b/src/lib/mood/create-from-telegram.ts
index c475ffb89..b8512f798 100644
--- a/src/lib/mood/create-from-telegram.ts
+++ b/src/lib/mood/create-from-telegram.ts
@@ -101,7 +101,7 @@ export async function logTelegramMood(input: {
 
   // Best-effort rollup refresh — a cache tier, never a write-path invariant.
   try {
-    await recomputeMoodBucketsForEntry(input.userId, moodLoggedAt);
+    await recomputeMoodBucketsForEntry(input.userId, date);
   } catch (rollupErr) {
     getEvent()?.addMeta(
       "telegram_mood_rollup_failed",
diff --git a/src/lib/rollups/__tests__/mood-rollups.test.ts b/src/lib/rollups/__tests__/mood-rollups.test.ts
index d7f4d6e4f..a46ddeccc 100644
--- a/src/lib/rollups/__tests__/mood-rollups.test.ts
+++ b/src/lib/rollups/__tests__/mood-rollups.test.ts
@@ -83,7 +83,9 @@ import {
   enqueueMoodRollupRecompute,
   ensureUserMoodRollupsFresh,
   recomputeMoodBucketsForEntry,
+  recomputeUserMoodRollups,
 } from "../mood-rollups";
+import { moodDateKey } from "@/lib/mood/date-key";
 
 beforeEach(() => {
   queryRaw.mockReset();
@@ -119,16 +121,14 @@ describe("recomputeMoodBucketsForEntry", () => {
     getGlobalBossMock.mockReturnValue({ send: bossSend });
     bossSend.mockResolvedValue("job-id");
 
-    await recomputeMoodBucketsForEntry(
-      "user-1",
-      new Date("2026-05-10T14:30:00.000Z"),
-    );
+    await recomputeMoodBucketsForEntry("user-1", "2026-05-10");
 
     expect(executeRaw).toHaveBeenCalledTimes(2);
     const insertBinds = bindValues(executeRaw.mock.calls[0]);
     expect(insertBinds).toContain("user-1");
-    // bucket_start is bound twice (INSERT row + INSERT SELECT predicate
-    // are both inside the same CTE shape via the same parameter).
+    // v1.32.12 — the aggregate WHERE keys on the `date` label string,
+    // and `bucket_start` is that label's UTC-midnight instant.
+    expect(insertBinds).toContain("2026-05-10");
     const dayStart = new Date("2026-05-10T00:00:00.000Z");
     expect(
       (insertBinds.filter((b) => b instanceof Date) as Date[]).some(
@@ -152,10 +152,7 @@ describe("recomputeMoodBucketsForEntry", () => {
   it("issues the paired DELETE so a fully-cleared day removes its row", async () => {
     getGlobalBossMock.mockReturnValue(null);
 
-    await recomputeMoodBucketsForEntry(
-      "user-1",
-      new Date("2026-05-10T14:30:00.000Z"),
-    );
+    await recomputeMoodBucketsForEntry("user-1", "2026-05-10");
 
     // The DELETE always fires; its NOT EXISTS predicate matches zero
     // rows on the populated-day branch and matches the row on the
@@ -169,14 +166,8 @@ describe("recomputeMoodBucketsForEntry", () => {
   it("is idempotent under re-run for the same (user, day)", async () => {
     getGlobalBossMock.mockReturnValue(null);
 
-    await recomputeMoodBucketsForEntry(
-      "user-1",
-      new Date("2026-05-10T14:30:00.000Z"),
-    );
-    await recomputeMoodBucketsForEntry(
-      "user-1",
-      new Date("2026-05-10T14:30:00.000Z"),
-    );
+    await recomputeMoodBucketsForEntry("user-1", "2026-05-10");
+    await recomputeMoodBucketsForEntry("user-1", "2026-05-10");
 
     expect(executeRaw).toHaveBeenCalledTimes(4);
     // Bind values for the INSERT statement match across both runs.
@@ -197,14 +188,8 @@ describe("recomputeMoodBucketsForEntry", () => {
     getGlobalBossMock.mockReturnValue(null);
 
     await Promise.all([
-      recomputeMoodBucketsForEntry(
-        "user-1",
-        new Date("2026-05-10T14:30:00.000Z"),
-      ),
-      recomputeMoodBucketsForEntry(
-        "user-1",
-        new Date("2026-05-10T14:30:00.000Z"),
-      ),
+      recomputeMoodBucketsForEntry("user-1", "2026-05-10"),
+      recomputeMoodBucketsForEntry("user-1", "2026-05-10"),
     ]);
     // 2 callers × 2 statements (INSERT + DELETE) each.
     expect(executeRaw).toHaveBeenCalledTimes(4);
@@ -226,10 +211,7 @@ describe("recomputeMoodBucketsForEntry", () => {
     });
     getGlobalBossMock.mockReturnValue({ send: () => enqueueGate });
 
-    await recomputeMoodBucketsForEntry(
-      "user-1",
-      new Date("2026-05-10T14:30:00.000Z"),
-    );
+    await recomputeMoodBucketsForEntry("user-1", "2026-05-10");
 
     // The helper has resolved even though the boss.send promise is
     // still pending. Resolve it after the assertion so the test does
@@ -239,6 +221,202 @@ describe("recomputeMoodBucketsForEntry", () => {
   });
 });
 
+describe("mood rollup keying — canonical MoodEntry.date label (v1.32.12)", () => {
+  // Each case is a boundary-straddling local mood. `moodDateKey` mints
+  // the label the WRITE path stores in `MoodEntry.date` and every live
+  // fallback keys on. The rollup writer must key its bucket on that SAME
+  // label — the UTC truncation of `moodLoggedAt` (the old bug) lands the
+  // entry on the wrong calendar day. All inputs are absolute instants +
+  // named zones, so the assertions hold under TZ=UTC.
+  const cases: Array<{
+    name: string;
+    moodLoggedAt: string;
+    tz: string;
+    expectedLabel: string;
+    straddles: boolean;
+  }> = [
+    {
+      name: "23:30 America/New_York straddles the UTC boundary forward",
+      moodLoggedAt: "2026-05-11T03:30:00.000Z", // 23:30 EDT on 2026-05-10
+      tz: "America/New_York",
+      expectedLabel: "2026-05-10",
+      straddles: true,
+    },
+    {
+      name: "00:30 Europe/Berlin straddles the UTC boundary back",
+      moodLoggedAt: "2026-05-09T22:30:00.000Z", // 00:30 CEST on 2026-05-10
+      tz: "Europe/Berlin",
+      expectedLabel: "2026-05-10",
+      straddles: true,
+    },
+    {
+      name: "legacy tz-null row anchors to Europe/Berlin",
+      moodLoggedAt: "2026-05-09T22:30:00.000Z",
+      tz: "",
+      expectedLabel: "2026-05-10",
+      straddles: true,
+    },
+    {
+      name: "DST fall-back night (Europe/Berlin, 2025-10-26) straddles forward",
+      moodLoggedAt: "2025-10-25T23:30:00.000Z", // 01:30 CEST on 2025-10-26
+      tz: "Europe/Berlin",
+      expectedLabel: "2025-10-26",
+      straddles: true,
+    },
+  ];
+
+  function utcLabel(d: Date): string {
+    return d.toISOString().slice(0, 10);
+  }
+
+  it.each(cases)(
+    "keys on the local date label, not the UTC day of moodLoggedAt — $name",
+    async ({ moodLoggedAt, tz, expectedLabel, straddles }) => {
+      getGlobalBossMock.mockReturnValue(null);
+      const at = new Date(moodLoggedAt);
+
+      // Parity: the label the write path stored (fallback key) is exactly
+      // what the hook keys on.
+      const label = moodDateKey(at, tz);
+      expect(label).toBe(expectedLabel);
+
+      await recomputeMoodBucketsForEntry("user-1", label);
+
+      const insertBinds = executeRaw.mock.calls[0].slice(1);
+      // Bucket keyed on the label string...
+      expect(insertBinds).toContain(expectedLabel);
+      // ...and bucket_start is that label's UTC midnight, which reads
+      // back as exactly the stored label (byte-identical to the fallback).
+      const bucketStart = insertBinds.find((b) => b instanceof Date) as Date;
+      expect(bucketStart.toISOString()).toBe(`${expectedLabel}T00:00:00.000Z`);
+      expect(utcLabel(bucketStart)).toBe(label);
+
+      // The OLD (buggy) UTC-truncation of moodLoggedAt lands on a
+      // different calendar day for every straddling entry.
+      const buggyUtcDay = new Date(
+        Date.UTC(at.getUTCFullYear(), at.getUTCMonth(), at.getUTCDate()),
+      );
+      expect(utcLabel(buggyUtcDay) !== expectedLabel).toBe(straddles);
+      if (straddles) {
+        expect(bucketStart.getTime()).not.toBe(buggyUtcDay.getTime());
+      }
+    },
+  );
+});
+
+describe("runMoodRollupAggregate keys on the date label (v1.32.12)", () => {
+  it('groups by m."date" (never mood_logged_at) and binds day labels', async () => {
+    // Mutation guard: reverting the GROUP BY / WHERE back to
+    // date_trunc(..., m."mood_logged_at") fails one of these assertions.
+    getGlobalBossMock.mockReturnValue(null);
+    queryRawUnsafe.mockResolvedValue([]);
+
+    await recomputeUserMoodRollups("user-1", {
+      granularities: ["DAY"],
+      from: new Date("2021-05-10T00:00:00.000Z"),
+      to: new Date("2026-05-10T12:00:00.000Z"),
+    });
+
+    expect(queryRawUnsafe).toHaveBeenCalledTimes(1);
+    const [sql, ...binds] = queryRawUnsafe.mock.calls[0] as [
+      string,
+      ...unknown[],
+    ];
+    expect(sql).toContain('m."date"');
+    expect(sql).not.toContain("mood_logged_at");
+    // Window bounds are lexicographic YYYY-MM-DD labels; the upper bound
+    // rounds up past a mid-day `to` so today's label is still folded.
+    expect(binds).toEqual(["user-1", "2021-05-10", "2026-05-11"]);
+  });
+
+  it("folds WEEK/MONTH/YEAR by the local label's calendar bucket", async () => {
+    getGlobalBossMock.mockReturnValue(null);
+    queryRawUnsafe.mockResolvedValue([]);
+
+    await recomputeUserMoodRollups("user-1", {
+      granularities: ["WEEK", "MONTH", "YEAR"],
+      from: new Date("2026-05-04T00:00:00.000Z"),
+      to: new Date("2026-05-11T00:00:00.000Z"),
+    });
+
+    for (const call of queryRawUnsafe.mock.calls) {
+      const sql = call[0] as string;
+      // The coarser tiers cast the label column to a date before
+      // truncating — never touch mood_logged_at.
+      expect(sql).toContain('m."date"::date');
+      expect(sql).not.toContain("mood_logged_at");
+    }
+  });
+});
+
+describe("recomputeUserMoodRollups replace (delete-then-refold, v1.32.12)", () => {
+  it("empties the folded granularities before refolding when replace:true", async () => {
+    getGlobalBossMock.mockReturnValue(null);
+    queryRawUnsafe.mockResolvedValue([]);
+    deleteMany.mockResolvedValue({ count: 0 });
+
+    await recomputeUserMoodRollups("user-1", {
+      granularities: ["DAY", "WEEK"],
+      replace: true,
+    });
+
+    expect(deleteMany).toHaveBeenCalledTimes(1);
+    expect(deleteMany).toHaveBeenCalledWith({
+      where: { userId: "user-1", granularity: { in: ["DAY", "WEEK"] } },
+    });
+  });
+
+  it("does NOT delete when replace is unset (per-bucket async fold)", async () => {
+    getGlobalBossMock.mockReturnValue(null);
+    queryRawUnsafe.mockResolvedValue([]);
+
+    await recomputeUserMoodRollups("user-1", { granularities: ["WEEK"] });
+
+    expect(deleteMany).not.toHaveBeenCalled();
+  });
+
+  it("is idempotent — refolding twice upserts the identical bucket key + stats", async () => {
+    getGlobalBossMock.mockReturnValue(null);
+    deleteMany.mockResolvedValue({ count: 0 });
+    const aggRow = {
+      bucket_start: new Date("2026-05-10T00:00:00.000Z"),
+      count: BigInt(3),
+      mean: 4.2,
+      min_score: 3,
+      max_score: 5,
+      sd: 0.5,
+    };
+    queryRawUnsafe.mockResolvedValue([aggRow]);
+    upsert.mockResolvedValue({});
+
+    await recomputeUserMoodRollups("user-1", {
+      granularities: ["DAY"],
+      replace: true,
+    });
+    const first = upsert.mock.calls.map((c) => c[0] as Record<string, unknown>);
+    upsert.mockClear();
+    await recomputeUserMoodRollups("user-1", {
+      granularities: ["DAY"],
+      replace: true,
+    });
+    const second = upsert.mock.calls.map(
+      (c) => c[0] as Record<string, unknown>,
+    );
+
+    expect(first).toHaveLength(1);
+    expect(second).toHaveLength(1);
+    // Same bucket key + same folded stats across both rebuilds (only the
+    // computedAt wall-clock differs, which we don't compare).
+    expect(first[0].where).toEqual(second[0].where);
+    expect((first[0].create as { count: number }).count).toBe(
+      (second[0].create as { count: number }).count,
+    );
+    expect((first[0].create as { mean: number }).mean).toBe(
+      (second[0].create as { mean: number }).mean,
+    );
+  });
+});
+
 describe("enqueueMoodRollupRecompute", () => {
   it("is a silent no-op when no boss is attached", async () => {
     getGlobalBossMock.mockReturnValue(null);
diff --git a/src/lib/rollups/mood-rollups.ts b/src/lib/rollups/mood-rollups.ts
index c840db4b7..78596eea9 100644
--- a/src/lib/rollups/mood-rollups.ts
+++ b/src/lib/rollups/mood-rollups.ts
@@ -16,11 +16,19 @@
  * to a bounded `prisma.moodEntryRollup.findMany` with the daily mean
  * already materialised.
  *
+ * Keying (v1.32.12): every bucket is keyed on the canonical per-row
+ * `MoodEntry.date` label (minted at write time by `moodDateKey` under
+ * the row's own `tz`), NOT the UTC truncation of `mood_logged_at`. The
+ * rollup is therefore byte-identical to every live `entry.date`
+ * fallback, and a late-evening / after-midnight local mood lands on the
+ * calendar day the user logged it in their timezone. `bucket_start`
+ * stores that label as its UTC-midnight instant.
+ *
  * Write hooks:
  *   - Every mood-entry create/update/delete fires
- *     `recomputeMoodBucketsForEntry`. The DAY pass runs inline
- *     (cheap — single `(user, day)` aggregate) so the next read sees
- *     the fresh row without waiting on pg-boss.
+ *     `recomputeMoodBucketsForEntry(userId, dateLabel)`. The DAY pass
+ *     runs inline (cheap — single `(user, day-label)` aggregate) so the
+ *     next read sees the fresh row without waiting on pg-boss.
  *   - WEEK / MONTH / YEAR are enqueued onto `mood-rollup-recompute`
  *     for the worker to fold. No current reader consumes them; the
  *     buckets exist so future cross-granularity readers ship without
@@ -70,6 +78,36 @@ export const MOOD_ROLLUP_FULL_BACKFILL_QUEUE = "mood-rollup-full-backfill";
 /** Boot-fold worker concurrency. Serial so we don't crowd the pool. */
 export const MOOD_ROLLUP_FULL_BACKFILL_CONCURRENCY = 1;
 
+/**
+ * Format a `Date` as a `YYYY-MM-DD` label from its UTC calendar parts.
+ * Used to convert a bucket-window bound (always a UTC-midnight instant,
+ * or `now` for the full fold) into the lexicographic day label the
+ * `mood_entries."date"` column carries.
+ */
+function utcDateLabel(d: Date): string {
+  const yyyy = d.getUTCFullYear();
+  const mm = String(d.getUTCMonth() + 1).padStart(2, "0");
+  const dd = String(d.getUTCDate()).padStart(2, "0");
+  return `${yyyy}-${mm}-${dd}`;
+}
+
+/**
+ * Exclusive upper day-label for a window `to` bound. A `to` that lands
+ * exactly on UTC midnight already IS the exclusive boundary (e.g. a
+ * `bucketSpan` week's next-Monday). A `to` mid-day (the full-fold's
+ * `new Date()`) rounds up to the following midnight so the day
+ * containing `to` is still folded — a plain UTC-slice of `now` would
+ * drop today's label under the half-open `< toLabel` filter.
+ */
+function exclusiveUpperLabel(to: Date): string {
+  const midnight = startOfUtcDay(to);
+  const boundary =
+    to.getTime() === midnight.getTime()
+      ? midnight
+      : new Date(midnight.getTime() + 24 * 60 * 60 * 1000);
+  return utcDateLabel(boundary);
+}
+
 /** Payload the worker queue carries. */
 export interface MoodRollupRecomputePayload {
   userId: string;
@@ -135,6 +173,16 @@ export async function recomputeUserMoodRollups(
     granularities?: RollupGranularity[];
     from?: Date;
     to?: Date;
+    /**
+     * Delete the user's existing rollup rows for the folded
+     * granularities before refolding. Used by the boot-time
+     * full-backfill worker (§ rebuild): it makes the fold
+     * self-cleaning against any row minted under an older keying
+     * (e.g. a rolling-deploy old-container write) rather than merely
+     * upserting over it. Left off for the per-bucket async fold, which
+     * targets a narrow window and must not wipe neighbouring buckets.
+     */
+    replace?: boolean;
   } = {},
 ): Promise<{ rowsUpserted: number; durationMs: number }> {
   const startedAt = Date.now();
@@ -143,6 +191,16 @@ export async function recomputeUserMoodRollups(
   const from = opts.from ?? fiveYearsAgo;
   const to = opts.to ?? new Date();
 
+  if (opts.replace) {
+    // Empty the folded granularities first so the refold below is the
+    // only source of truth. With zero rows in place every read for this
+    // user falls back to the live `date`-keyed walk (correct data) for
+    // the brief window until the fold lands.
+    await prisma.moodEntryRollup.deleteMany({
+      where: { userId, granularity: { in: granularities } },
+    });
+  }
+
   let rowsUpserted = 0;
 
   for (const granularity of granularities) {
@@ -174,7 +232,7 @@ export async function recomputeUserMoodRollups(
  */
 export async function recomputeMoodBucketsForEntry(
   userId: string,
-  moodLoggedAt: Date,
+  dateLabel: string,
 ): Promise<void> {
   const client = prisma;
   // DAY pass — synchronous. v1.4.39 hotfix (QA F-H-02): one atomic SQL
@@ -183,8 +241,15 @@ export async function recomputeMoodBucketsForEntry(
   // could interleave A-SELECT → B-SELECT → B-UPSERT (correct) →
   // A-UPSERT (stale N-1). The trailing DELETE handles the "all entries
   // for the day were removed" case in the same shot.
-  const dayStart = startOfUtcDay(moodLoggedAt);
-  const dayEnd = new Date(dayStart.getTime() + 24 * 60 * 60 * 1000);
+  //
+  // v1.32.12: the bucket is keyed on the canonical per-row `date` label
+  // (`MoodEntry.date`, minted at write time via `moodDateKey` under the
+  // row's own `tz`), NOT the UTC truncation of `mood_logged_at`. This
+  // makes the rollup byte-identical to every live fallback (which keys
+  // on `entry.date`) and puts a late-evening / after-midnight local
+  // mood on the calendar day the user logged it in their own timezone.
+  // `bucket_start` encodes the label as its UTC midnight instant.
+  const bucketStart = new Date(`${dateLabel}T00:00:00.000Z`);
   await client.$executeRaw`
     WITH aggregate AS (
       SELECT
@@ -194,17 +259,16 @@ export async function recomputeMoodBucketsForEntry(
         MAX(m."score")::integer                      AS max_score,
         STDDEV_POP(m."score")::double precision      AS sd
       FROM "mood_entries" m
-      WHERE m."user_id"        = ${userId}
-        AND m."deleted_at"     IS NULL
-        AND m."mood_logged_at" >= ${dayStart}
-        AND m."mood_logged_at" <  ${dayEnd}
+      WHERE m."user_id"    = ${userId}
+        AND m."deleted_at" IS NULL
+        AND m."date"       = ${dateLabel}
     )
     INSERT INTO "mood_entry_rollups"
       ("user_id", "granularity", "bucket_start", "count", "mean", "min_score", "max_score", "sd", "computed_at")
     SELECT
       ${userId},
       'DAY',
-      ${dayStart},
+      ${bucketStart},
       aggregate.count,
       aggregate.mean,
       aggregate.min_score,
@@ -225,14 +289,13 @@ export async function recomputeMoodBucketsForEntry(
     DELETE FROM "mood_entry_rollups"
     WHERE "user_id"      = ${userId}
       AND "granularity"  = 'DAY'
-      AND "bucket_start" = ${dayStart}
+      AND "bucket_start" = ${bucketStart}
       AND NOT EXISTS (
         SELECT 1
         FROM "mood_entries" m
-        WHERE m."user_id"        = ${userId}
-          AND m."deleted_at"     IS NULL
-          AND m."mood_logged_at" >= ${dayStart}
-          AND m."mood_logged_at" <  ${dayEnd}
+        WHERE m."user_id"    = ${userId}
+          AND m."deleted_at" IS NULL
+          AND m."date"       = ${dateLabel}
       )
   `;
 
@@ -246,7 +309,7 @@ export async function recomputeMoodBucketsForEntry(
   // captures any pg-boss failure.
   void Promise.all(
     ASYNC_GRANULARITIES.map((granularity) => {
-      const { from, to } = bucketSpan(moodLoggedAt, granularity);
+      const { from, to } = bucketSpan(dateLabel, granularity);
       return enqueueMoodRollupRecompute({
         userId,
         granularity,
@@ -527,13 +590,21 @@ export async function enqueueBootTimeMoodRollupBackfill(
 // ─── internals ────────────────────────────────────────────
 
 /**
- * Pull the raw aggregates from Postgres. Groups by
- * `date_trunc(<granularity>, mood_logged_at)` and folds the stats
- * with `STDDEV_POP`. The `date_trunc` unit literal must be inlined
- * because Postgres rejects a parameterised expression in a GROUP BY;
- * the value comes from a closed enum (DATE_TRUNC_UNIT) so there's no
- * injection surface — we still assert against the whitelist before
- * splicing.
+ * Pull the raw aggregates from Postgres. Groups by the local calendar
+ * bucket of the canonical `MoodEntry.date` label —
+ * `date_trunc(<granularity>, m."date"::date)` — so a day belongs to the
+ * week / month / year of its *local* label, not the UTC instant of its
+ * `mood_logged_at`. `bucket_start` is the label's UTC-midnight encoding
+ * (`::timestamptz` under the UTC session), byte-identical to the DAY
+ * hook and to every live `entry.date` fallback (v1.32.12).
+ *
+ * The `date_trunc` unit literal must be inlined because Postgres rejects
+ * a parameterised expression in a GROUP BY; the value comes from a
+ * closed enum (DATE_TRUNC_UNIT) so there's no injection surface — we
+ * still assert against the whitelist before splicing. The window bounds
+ * are the `date` column's lexicographic day labels (YYYY-MM-DD sorts as
+ * the calendar day), so a boundary-straddling entry can never fall out
+ * of its own recompute window.
  */
 async function runMoodRollupAggregate(
   client: PrismaTxOrClient,
@@ -548,28 +619,28 @@ async function runMoodRollupAggregate(
   if (!["day", "week", "month", "year"].includes(truncUnit)) {
     throw new Error(`unexpected granularity: ${input.granularity}`);
   }
-  const dateTrunc = `date_trunc('${truncUnit}', m."mood_logged_at")`;
+  const bucketExpr = `date_trunc('${truncUnit}', m."date"::date)::timestamptz`;
 
   const sql = `
     SELECT
-      ${dateTrunc}                                              AS bucket_start,
+      ${bucketExpr}                                             AS bucket_start,
       COUNT(*)                                                  AS count,
       AVG(m."score")::double precision                          AS mean,
       MIN(m."score")::integer                                   AS min_score,
       MAX(m."score")::integer                                   AS max_score,
       STDDEV_POP(m."score")::double precision                   AS sd
     FROM mood_entries m
-    WHERE m."user_id"        = $1
-      AND m."deleted_at"     IS NULL
-      AND m."mood_logged_at" >= $2
-      AND m."mood_logged_at" <  $3
-    GROUP BY ${dateTrunc}
+    WHERE m."user_id"    = $1
+      AND m."deleted_at" IS NULL
+      AND m."date"       >= $2
+      AND m."date"       <  $3
+    GROUP BY ${bucketExpr}
   `;
   return client.$queryRawUnsafe<MoodRollupRow[]>(
     sql,
     input.userId,
-    input.from,
-    input.to,
+    utcDateLabel(input.from),
+    exclusiveUpperLabel(input.to),
   );
 }
 
@@ -627,44 +698,49 @@ async function persistMoodRollupRows(
 }
 
 /**
- * Span of the bucket containing `moodLoggedAt` at the given
- * granularity. Mirrors `measurement-rollups` so the WEEK / MONTH /
- * YEAR fold queries select the same set of rows the read-side
- * `date_trunc` would group on.
+ * Span of the bucket containing the calendar day `dateLabel`
+ * (`YYYY-MM-DD`, a `MoodEntry.date` value) at the given granularity.
+ * The window bounds are UTC-midnight instants of the local label
+ * boundaries; `runMoodRollupAggregate` converts them back to day labels
+ * for its `m."date"` range filter, so the fold selects exactly the rows
+ * whose label falls in this bucket — the local calendar week / month /
+ * year, not the UTC span of a `mood_logged_at` instant (v1.32.12).
  */
 function bucketSpan(
-  moodLoggedAt: Date,
+  dateLabel: string,
   granularity: RollupGranularity,
 ): { from: Date; to: Date } {
+  // Anchor at the label's UTC midnight; its UTC calendar parts ARE the
+  // label's parts, so the existing UTC date math below is exact.
+  const anchor = new Date(`${dateLabel}T00:00:00.000Z`);
   switch (granularity) {
     case "DAY": {
-      const from = startOfUtcDay(moodLoggedAt);
-      return { from, to: new Date(from.getTime() + 24 * 60 * 60 * 1000) };
+      return {
+        from: anchor,
+        to: new Date(anchor.getTime() + 24 * 60 * 60 * 1000),
+      };
     }
     case "WEEK": {
-      const day = startOfUtcDay(moodLoggedAt);
       // Postgres ISO week: Monday is day 1. JS getUTCDay(): Sunday=0.
-      const dayOfWeek = day.getUTCDay();
+      const dayOfWeek = anchor.getUTCDay();
       const mondayOffset = (dayOfWeek + 6) % 7;
-      const from = new Date(day.getTime() - mondayOffset * 24 * 60 * 60 * 1000);
+      const from = new Date(
+        anchor.getTime() - mondayOffset * 24 * 60 * 60 * 1000,
+      );
       return { from, to: new Date(from.getTime() + 7 * 24 * 60 * 60 * 1000) };
     }
     case "MONTH": {
       const from = new Date(
-        Date.UTC(moodLoggedAt.getUTCFullYear(), moodLoggedAt.getUTCMonth(), 1),
+        Date.UTC(anchor.getUTCFullYear(), anchor.getUTCMonth(), 1),
       );
       const to = new Date(
-        Date.UTC(
-          moodLoggedAt.getUTCFullYear(),
-          moodLoggedAt.getUTCMonth() + 1,
-          1,
-        ),
+        Date.UTC(anchor.getUTCFullYear(), anchor.getUTCMonth() + 1, 1),
       );
       return { from, to };
     }
     case "YEAR": {
-      const from = new Date(Date.UTC(moodLoggedAt.getUTCFullYear(), 0, 1));
-      const to = new Date(Date.UTC(moodLoggedAt.getUTCFullYear() + 1, 0, 1));
+      const from = new Date(Date.UTC(anchor.getUTCFullYear(), 0, 1));
+      const to = new Date(Date.UTC(anchor.getUTCFullYear() + 1, 0, 1));
       return { from, to };
     }
   }
diff --git a/src/lib/tz/start-of-utc-day.ts b/src/lib/tz/start-of-utc-day.ts
index eb9cc53be..f5b1306a4 100644
--- a/src/lib/tz/start-of-utc-day.ts
+++ b/src/lib/tz/start-of-utc-day.ts
@@ -1,17 +1,19 @@
 /**
- * UTC-anchored start-of-day truncation shared by the measurement +
- * mood rollup writers.
+ * UTC-anchored start-of-day truncation used by the measurement rollup
+ * writer.
  *
- * Both rollup tables store TIMESTAMPTZ bucket starts. Anchoring on the
- * UTC calendar day (rather than the user's local day) keeps the bucket
- * key deterministic across timezone-shifting consumers — the same
- * convention `date_trunc('day', measured_at AT TIME ZONE 'UTC')` would
- * produce on the read side. The display surfaces re-bucket into the
- * user's timezone via `userDayKey()` from `./format`.
+ * The measurement rollup table stores TIMESTAMPTZ bucket starts.
+ * Anchoring on the UTC calendar day (rather than the user's local day)
+ * keeps the bucket key deterministic across timezone-shifting consumers
+ * — the same convention `date_trunc('day', measured_at AT TIME ZONE
+ * 'UTC')` would produce on the read side. The display surfaces re-bucket
+ * into the user's timezone via `userDayKey()` from `./format`.
  *
- * v1.4.40 W-GHOSTS consolidated two byte-identical local copies
- * (`src/lib/measurements/rollups.ts` + `src/lib/mood/rollups.ts`) into
- * this module so future writers cannot drift independently.
+ * v1.4.40 W-GHOSTS consolidated two byte-identical local copies into
+ * this module so future writers cannot drift independently. Note the
+ * mood rollup writer no longer anchors here: since v1.32.12 it keys on
+ * the canonical per-row `MoodEntry.date` label, so a mood lands on the
+ * user's own local day rather than the UTC day of `mood_logged_at`.
  */
 export function startOfUtcDay(d: Date): Date {
   return new Date(