diff --git a/messages/de.json b/messages/de.json
index 94ffa09ed..8084f470b 100644
--- a/messages/de.json
+++ b/messages/de.json
@@ -2987,5 +2987,9 @@
     "buttonSnoozeOneHour": "🕐 1h",
     "buttonSnoozeThreeHours": "🕐 3h",
     "buttonSkip": "⏭ Überspringen"
+  },
+  "moodReminders": {
+    "dailyTitle": "Stimmung erfassen",
+    "dailyBody": "Wie geht es dir heute?"
   }
 }
diff --git a/messages/en.json b/messages/en.json
index cc8043984..84e4fea2d 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -2987,5 +2987,9 @@
     "buttonSnoozeOneHour": "🕐 1h",
     "buttonSnoozeThreeHours": "🕐 3h",
     "buttonSkip": "⏭ Skip"
+  },
+  "moodReminders": {
+    "dailyTitle": "Log your mood",
+    "dailyBody": "How are you feeling today?"
   }
 }
diff --git a/messages/es.json b/messages/es.json
index e4cdb79c9..65cb0d819 100644
--- a/messages/es.json
+++ b/messages/es.json
@@ -2987,5 +2987,9 @@
     "buttonSnoozeOneHour": "🕐 1h",
     "buttonSnoozeThreeHours": "🕐 3h",
     "buttonSkip": "⏭ Omitir"
+  },
+  "moodReminders": {
+    "dailyTitle": "Registrar el ánimo",
+    "dailyBody": "¿Cómo te sientes hoy?"
   }
 }
diff --git a/messages/fr.json b/messages/fr.json
index 1917e8ff6..3cdfe68da 100644
--- a/messages/fr.json
+++ b/messages/fr.json
@@ -2987,5 +2987,9 @@
     "buttonSnoozeOneHour": "🕐 1h",
     "buttonSnoozeThreeHours": "🕐 3h",
     "buttonSkip": "⏭ Ignorer"
+  },
+  "moodReminders": {
+    "dailyTitle": "Enregistrer votre humeur",
+    "dailyBody": "Comment vous sentez-vous aujourdhui ?"
   }
 }
diff --git a/messages/it.json b/messages/it.json
index 8c0c39723..12d69c952 100644
--- a/messages/it.json
+++ b/messages/it.json
@@ -2987,5 +2987,9 @@
     "buttonSnoozeOneHour": "🕐 1h",
     "buttonSnoozeThreeHours": "🕐 3h",
     "buttonSkip": "⏭ Salta"
+  },
+  "moodReminders": {
+    "dailyTitle": "Registra il tuo umore",
+    "dailyBody": "Come ti senti oggi?"
   }
 }
diff --git a/messages/pl.json b/messages/pl.json
index 87d5ad7dc..7afc2bf37 100644
--- a/messages/pl.json
+++ b/messages/pl.json
@@ -2987,5 +2987,9 @@
     "buttonSnoozeOneHour": "🕐 1h",
     "buttonSnoozeThreeHours": "🕐 3h",
     "buttonSkip": "⏭ Pomiń"
+  },
+  "moodReminders": {
+    "dailyTitle": "Zapisz nastrój",
+    "dailyBody": "Jak się dzisiaj czujesz?"
   }
 }
diff --git a/prisma/migrations/0069_v054_mood_reminder/migration.sql b/prisma/migrations/0069_v054_mood_reminder/migration.sql
new file mode 100644
index 000000000..5550a94ef
--- /dev/null
+++ b/prisma/migrations/0069_v054_mood_reminder/migration.sql
@@ -0,0 +1,39 @@
+-- v0.5.4 ios-coord — daily mood reminder.
+--
+-- Two additions:
+--   1. `users.mood_reminder_enabled` — per-user opt-in flag. Default
+--      `false` because mood capture is an emotionally-loaded surface;
+--      we never want a fresh-install user to receive a 22:00 nudge
+--      without first toggling the preference in Settings.
+--   2. `mood_reminder_dispatches` — per-(user, local date) ledger
+--      enforcing one push per day. Unique constraint doubles as the
+--      idempotency anchor for parallel workers + cron re-ticks inside
+--      the 22:00 window (cron fires every 15 min).
+--
+-- Both additions are additive — existing rows stay on the
+-- "opt-out-of-everything" path byte-identical to v1.4.38 behaviour.
+ALTER TABLE "users"
+  ADD COLUMN IF NOT EXISTS "mood_reminder_enabled" BOOLEAN NOT NULL DEFAULT FALSE;
+
+CREATE TABLE IF NOT EXISTS "mood_reminder_dispatches" (
+    "id" TEXT NOT NULL,
+    "user_id" TEXT NOT NULL,
+    "date" TEXT NOT NULL,
+    "dispatched_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "mood_reminder_dispatches_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS "mood_reminder_dispatches_user_id_date_key"
+  ON "mood_reminder_dispatches"("user_id", "date");
+
+CREATE INDEX IF NOT EXISTS "mood_reminder_dispatches_user_id_dispatched_at_idx"
+  ON "mood_reminder_dispatches"("user_id", "dispatched_at");
+
+DO $$ BEGIN
+  ALTER TABLE "mood_reminder_dispatches"
+    ADD CONSTRAINT "mood_reminder_dispatches_user_id_fkey"
+    FOREIGN KEY ("user_id") REFERENCES "users"("id")
+    ON DELETE CASCADE ON UPDATE CASCADE;
+EXCEPTION
+  WHEN duplicate_object THEN NULL;
+END $$;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 824bb8bf9..52d63f97a 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -198,6 +198,17 @@ model User {
   // a full refresh on the next pair".
   lastSyncedAt DateTime? @map("last_synced_at")
 
+  // v0.5.4 ios-coord — daily mood-reminder opt-in.
+  //
+  // When `true` the reminder worker dispatches a `MOOD_REMINDER`
+  // notification at 22:00 in the user's local timezone if no
+  // `MoodEntry` row exists for the local date yet. Default `false`
+  // because mood capture is an emotional surface — the user has to
+  // explicitly opt in from Settings → Notifications before the
+  // server starts nudging them. The dedup is handled by the
+  // `MoodReminderDispatch` table (one row per user + local date).
+  moodReminderEnabled Boolean @default(false) @map("mood_reminder_enabled")
+
   // v1.4.25 W6c — Doctor-report section toggles.
   // Shape:
   //   { "bp": boolean,
@@ -267,6 +278,12 @@ model User {
   // granularity from the measurement write hooks; WEEK/MONTH/YEAR
   // are enqueued through pg-boss for the worker to fold.
   measurementRollups     MeasurementRollup[]
+  // v0.5.4 ios-coord — per-day dedup ledger for MOOD_REMINDER pushes.
+  // One row per (user, local date) the worker has nudged. Prevents
+  // a second push when the cron rechecks the same hour later in the
+  // 22:00 window (the cron fires every 15 min — without the ledger
+  // a user could see three pushes back-to-back).
+  moodReminderDispatches MoodReminderDispatch[]
 
   @@map("users")
 }
@@ -1173,6 +1190,27 @@ model MoodEntry {
   @@map("mood_entries")
 }
 
+// ─── Mood Reminder Dispatch Ledger (v0.5.4 ios-coord) ─────
+//
+// Idempotency guard for the daily 22:00 MOOD_REMINDER push. The
+// reminder cron fires every 15 min — when it lands inside the 22:00
+// window the handler looks up `(userId, date)` here and bails if a row
+// already exists, so the user sees exactly one nudge per local day.
+// `date` is a YYYY-MM-DD string anchored to the user's timezone at
+// dispatch time (same encoding convention as MoodEntry.date).
+model MoodReminderDispatch {
+  id           String   @id @default(cuid())
+  userId       String   @map("user_id")
+  date         String // YYYY-MM-DD anchored to user.timezone
+  dispatchedAt DateTime @default(now()) @map("dispatched_at")
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([userId, date])
+  @@index([userId, dispatchedAt])
+  @@map("mood_reminder_dispatches")
+}
+
 // ─── Integration Status (v1.4.15) ─────────────────────────
 //
 // Per-(user, integration) row that captures the most recent sync attempt
diff --git a/src/lib/jobs/__tests__/mood-reminder.test.ts b/src/lib/jobs/__tests__/mood-reminder.test.ts
new file mode 100644
index 000000000..d6b633105
--- /dev/null
+++ b/src/lib/jobs/__tests__/mood-reminder.test.ts
@@ -0,0 +1,382 @@
+/**
+ * v0.5.4 ios-coord — mood-reminder dispatcher unit tests.
+ *
+ * Pins the contract that motivated the v0.5.4 server-side patch:
+ *   - Opt-in gating: `moodReminderEnabled = false` ⇒ never dispatch.
+ *   - Window gating: only fires inside the 22:00 local-time hour.
+ *   - Logged-today skip: a `MoodEntry` row for the local date short-
+ *     circuits the dispatch.
+ *   - Idempotency: a `MoodReminderDispatch` row blocks a second push
+ *     for the same (user, date) — even when the cron re-ticks inside
+ *     the same 22:00 window.
+ *   - Locale: title + body come from `messages/{de,en}.json` and fall
+ *     back to the app default when the user's locale is null/unknown.
+ *
+ * The tests stub the Prisma surface manually to keep this file free of
+ * a testcontainer boot.
+ */
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+import {
+  buildMoodReminderPayload,
+  evaluateMoodReminderWindow,
+  runMoodReminderTick,
+  MOOD_REMINDER_LOCAL_HOUR,
+} from "../mood-reminder";
+import type { NotificationPayload } from "@/lib/notifications/types";
+
+type DispatchFn = (payload: NotificationPayload) => Promise<void>;
+
+interface FakePrismaState {
+  candidates: Array<{
+    id: string;
+    timezone: string;
+    locale: string | null;
+    moodReminderEnabled: boolean;
+  }>;
+  moodEntries: Array<{ userId: string; date: string }>;
+  dispatches: Array<{ userId: string; date: string }>;
+  /** Force the next `moodReminderDispatch.create` to throw P2002. */
+  raceUserIds: Set<string>;
+}
+
+function makePrisma(state: FakePrismaState) {
+  return {
+    user: {
+      findMany: vi.fn(
+        async ({ where }: { where: { moodReminderEnabled: boolean } }) => {
+          return state.candidates.filter(
+            (c) => c.moodReminderEnabled === where.moodReminderEnabled,
+          );
+        },
+      ),
+    },
+    moodEntry: {
+      findFirst: vi.fn(
+        async ({ where }: { where: { userId: string; date: string } }) => {
+          return (
+            state.moodEntries.find(
+              (m) => m.userId === where.userId && m.date === where.date,
+            ) ?? null
+          );
+        },
+      ),
+    },
+    moodReminderDispatch: {
+      findUnique: vi.fn(
+        async ({
+          where,
+        }: {
+          where: { userId_date: { userId: string; date: string } };
+        }) => {
+          return (
+            state.dispatches.find(
+              (d) =>
+                d.userId === where.userId_date.userId &&
+                d.date === where.userId_date.date,
+            ) ?? null
+          );
+        },
+      ),
+      create: vi.fn(
+        async ({ data }: { data: { userId: string; date: string } }) => {
+          if (state.raceUserIds.has(data.userId)) {
+            // Mirrors the Prisma `P2002` shape closely enough that the
+            // handler's substring match (`includes("P2002")`) catches it.
+            throw new Error(
+              "Invalid `prisma.moodReminderDispatch.create()` invocation: " +
+                "Unique constraint failed on the fields: (`user_id`,`date`). " +
+                "code: P2002",
+            );
+          }
+          state.dispatches.push(data);
+          return { id: `dispatch-${state.dispatches.length}`, ...data };
+        },
+      ),
+    },
+  };
+}
+
+beforeEach(() => {
+  vi.useRealTimers();
+});
+
+describe("evaluateMoodReminderWindow", () => {
+  it("returns fire=false when the user is opted out", () => {
+    const at22 = new Date("2026-05-17T20:00:00Z"); // 22:00 Europe/Berlin
+    const r = evaluateMoodReminderWindow(
+      { timezone: "Europe/Berlin", moodReminderEnabled: false },
+      at22,
+    );
+    expect(r.fire).toBe(false);
+    expect(r.localDate).toBeNull();
+  });
+
+  it("fires inside the 22:00 hour and returns the local date string", () => {
+    const at22 = new Date("2026-05-17T20:00:00Z"); // 22:00 Europe/Berlin (CEST)
+    const r = evaluateMoodReminderWindow(
+      { timezone: "Europe/Berlin", moodReminderEnabled: true },
+      at22,
+    );
+    expect(r.fire).toBe(true);
+    expect(r.localDate).toBe("2026-05-17");
+    expect(r.localHour).toBe(MOOD_REMINDER_LOCAL_HOUR);
+  });
+
+  it("does NOT fire at 21:59 local time (off-by-one guard)", () => {
+    const at2159 = new Date("2026-05-17T19:59:00Z"); // 21:59 Europe/Berlin
+    const r = evaluateMoodReminderWindow(
+      { timezone: "Europe/Berlin", moodReminderEnabled: true },
+      at2159,
+    );
+    expect(r.fire).toBe(false);
+    expect(r.localHour).toBe(21);
+  });
+
+  it("does NOT fire at 23:00 local time (window end)", () => {
+    const at23 = new Date("2026-05-17T21:00:00Z"); // 23:00 Europe/Berlin
+    const r = evaluateMoodReminderWindow(
+      { timezone: "Europe/Berlin", moodReminderEnabled: true },
+      at23,
+    );
+    expect(r.fire).toBe(false);
+    expect(r.localHour).toBe(23);
+  });
+
+  it("respects a non-Berlin timezone (America/New_York is 6h behind in DST)", () => {
+    // 02:00 UTC on 2026-05-18 = 22:00 EDT on 2026-05-17 (UTC-4 during DST).
+    const utc = new Date("2026-05-18T02:00:00Z");
+    const r = evaluateMoodReminderWindow(
+      { timezone: "America/New_York", moodReminderEnabled: true },
+      utc,
+    );
+    expect(r.fire).toBe(true);
+    expect(r.localDate).toBe("2026-05-17");
+  });
+});
+
+describe("buildMoodReminderPayload", () => {
+  it("returns German strings for locale=de", () => {
+    const p = buildMoodReminderPayload("de");
+    expect(p.title).toBe("Stimmung erfassen");
+    expect(p.body).toBe("Wie geht es dir heute?");
+  });
+
+  it("returns English strings for locale=en", () => {
+    const p = buildMoodReminderPayload("en");
+    expect(p.title).toBe("Log your mood");
+    expect(p.body).toBe("How are you feeling today?");
+  });
+
+  it("falls back to the app default for null / unknown locales", () => {
+    const p1 = buildMoodReminderPayload(null);
+    const p2 = buildMoodReminderPayload("zz-ZZ");
+    // Both should resolve to the same content (the app default).
+    expect(p1.title).toBe(p2.title);
+    expect(p1.title.length).toBeGreaterThan(0);
+  });
+});
+
+describe("runMoodReminderTick", () => {
+  // 22:00 Europe/Berlin (CEST) ⇒ 20:00 UTC.
+  const inWindow = new Date("2026-05-17T20:00:00Z");
+  // 21:00 Europe/Berlin (CEST) ⇒ 19:00 UTC.
+  const outOfWindow = new Date("2026-05-17T19:00:00Z");
+
+  it("dispatches MOOD_REMINDER for opted-in users in the 22:00 window", async () => {
+    const state: FakePrismaState = {
+      candidates: [
+        {
+          id: "u-1",
+          timezone: "Europe/Berlin",
+          locale: "de",
+          moodReminderEnabled: true,
+        },
+      ],
+      moodEntries: [],
+      dispatches: [],
+      raceUserIds: new Set(),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    const summary = await runMoodReminderTick(prisma as never, inWindow, {
+      dispatch,
+    });
+
+    expect(summary.dispatched).toBe(1);
+    expect(summary.inWindow).toBe(1);
+    expect(dispatch).toHaveBeenCalledTimes(1);
+    const firstCall = dispatch.mock.calls[0];
+    if (!firstCall) throw new Error("dispatch was not called");
+    const call = firstCall[0];
+    expect(call.eventType).toBe("MOOD_REMINDER");
+    expect(call.userId).toBe("u-1");
+    expect(call.title).toBe("Stimmung erfassen");
+    expect(call.message).toBe("Wie geht es dir heute?");
+    expect(call.metadata?.localDate).toBe("2026-05-17");
+    expect(typeof call.metadata?.scheduledAt).toBe("string");
+    expect(state.dispatches).toHaveLength(1);
+    expect(state.dispatches[0]).toEqual({ userId: "u-1", date: "2026-05-17" });
+  });
+
+  it("does NOT dispatch for users outside the 22:00 window", async () => {
+    const state: FakePrismaState = {
+      candidates: [
+        {
+          id: "u-1",
+          timezone: "Europe/Berlin",
+          locale: "de",
+          moodReminderEnabled: true,
+        },
+      ],
+      moodEntries: [],
+      dispatches: [],
+      raceUserIds: new Set(),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    const summary = await runMoodReminderTick(prisma as never, outOfWindow, {
+      dispatch,
+    });
+
+    expect(summary.dispatched).toBe(0);
+    expect(summary.skippedOutsideWindow).toBe(1);
+    expect(dispatch).not.toHaveBeenCalled();
+  });
+
+  it("never reads moodReminderEnabled=false users (opt-in gating)", async () => {
+    const state: FakePrismaState = {
+      candidates: [], // Prisma `where` already filters; we assert the call shape
+      moodEntries: [],
+      dispatches: [],
+      raceUserIds: new Set(),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    await runMoodReminderTick(prisma as never, inWindow, { dispatch });
+
+    expect(prisma.user.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({ where: { moodReminderEnabled: true } }),
+    );
+  });
+
+  it("skips users who already logged a mood for the local date", async () => {
+    const state: FakePrismaState = {
+      candidates: [
+        {
+          id: "u-1",
+          timezone: "Europe/Berlin",
+          locale: "de",
+          moodReminderEnabled: true,
+        },
+      ],
+      moodEntries: [{ userId: "u-1", date: "2026-05-17" }],
+      dispatches: [],
+      raceUserIds: new Set(),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    const summary = await runMoodReminderTick(prisma as never, inWindow, {
+      dispatch,
+    });
+
+    expect(summary.dispatched).toBe(0);
+    expect(summary.skippedAlreadyLogged).toBe(1);
+    expect(dispatch).not.toHaveBeenCalled();
+    expect(state.dispatches).toHaveLength(0);
+  });
+
+  it("idempotency: a second tick inside the same window does not re-send", async () => {
+    const state: FakePrismaState = {
+      candidates: [
+        {
+          id: "u-1",
+          timezone: "Europe/Berlin",
+          locale: "de",
+          moodReminderEnabled: true,
+        },
+      ],
+      moodEntries: [],
+      // Existing dispatch row blocks the push.
+      dispatches: [{ userId: "u-1", date: "2026-05-17" }],
+      raceUserIds: new Set(),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    const summary = await runMoodReminderTick(prisma as never, inWindow, {
+      dispatch,
+    });
+
+    expect(summary.dispatched).toBe(0);
+    expect(summary.skippedAlreadyDispatched).toBe(1);
+    expect(dispatch).not.toHaveBeenCalled();
+  });
+
+  it("idempotency: lost P2002 race is swallowed as 'already dispatched'", async () => {
+    const state: FakePrismaState = {
+      candidates: [
+        {
+          id: "u-1",
+          timezone: "Europe/Berlin",
+          locale: "de",
+          moodReminderEnabled: true,
+        },
+      ],
+      moodEntries: [],
+      dispatches: [],
+      raceUserIds: new Set(["u-1"]),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    const summary = await runMoodReminderTick(prisma as never, inWindow, {
+      dispatch,
+    });
+
+    expect(summary.dispatched).toBe(0);
+    expect(summary.skippedAlreadyDispatched).toBe(1);
+    expect(dispatch).not.toHaveBeenCalled();
+  });
+
+  it("dispatches per-user with their own locale (DE + EN mix)", async () => {
+    const state: FakePrismaState = {
+      candidates: [
+        {
+          id: "u-de",
+          timezone: "Europe/Berlin",
+          locale: "de",
+          moodReminderEnabled: true,
+        },
+        {
+          id: "u-en",
+          timezone: "Europe/Berlin",
+          locale: "en",
+          moodReminderEnabled: true,
+        },
+      ],
+      moodEntries: [],
+      dispatches: [],
+      raceUserIds: new Set(),
+    };
+    const prisma = makePrisma(state);
+    const dispatch = vi.fn<DispatchFn>(async () => {});
+
+    const summary = await runMoodReminderTick(prisma as never, inWindow, {
+      dispatch,
+    });
+
+    expect(summary.dispatched).toBe(2);
+    expect(dispatch).toHaveBeenCalledTimes(2);
+    const titles = dispatch.mock.calls.map((c) => {
+      const [payload] = c;
+      return payload?.title ?? "";
+    });
+    expect(titles).toContain("Stimmung erfassen");
+    expect(titles).toContain("Log your mood");
+  });
+});
diff --git a/src/lib/jobs/mood-reminder.ts b/src/lib/jobs/mood-reminder.ts
new file mode 100644
index 000000000..9ad52ca8a
--- /dev/null
+++ b/src/lib/jobs/mood-reminder.ts
@@ -0,0 +1,235 @@
+/**
+ * v0.5.4 ios-coord — daily mood-reminder dispatcher.
+ *
+ * The reminder cron fires every 15 minutes (same cadence as the
+ * medication-reminder loop in `reminder-worker.ts`). When the cron lands
+ * inside the 22:00 hour in a user's local timezone, this module:
+ *
+ *   1. Skips users who haven't opted in (`User.moodReminderEnabled = false`).
+ *   2. Skips users who already logged a mood entry for the local date.
+ *   3. Skips users who already received a mood reminder today
+ *      (idempotency via `MoodReminderDispatch` row).
+ *   4. Dispatches a `MOOD_REMINDER` notification with a locale-aware
+ *      title + body and records the dispatch ledger row in the same
+ *      transaction so a concurrent worker can't double-fire.
+ *
+ * Why a separate module instead of folding it into reminder-worker.ts:
+ * the worker is already 1800 LOC. Splitting the mood-reminder logic out
+ * keeps the test surface focused and lets the unit tests run without
+ * booting pg-boss.
+ */
+import type { PrismaClient } from "@/generated/prisma/client";
+import { getServerTranslator } from "@/lib/i18n/server-translator";
+import type { Locale } from "@/lib/i18n/config";
+import { defaultLocale } from "@/lib/i18n/config";
+import { getLocalDateParts } from "@/lib/timezone";
+import { dispatchNotification } from "@/lib/notifications/dispatcher";
+
+/**
+ * Hour of day (in the user's local timezone) at which the mood reminder
+ * should fire. 22:00 is late enough that a "did you forget to log?" nudge
+ * lands in the user's wind-down window without colliding with dinner or
+ * the medication-reminder hot path.
+ *
+ * Exported so the unit tests can pin the contract without scraping the
+ * handler internals.
+ */
+export const MOOD_REMINDER_LOCAL_HOUR = 22;
+
+/**
+ * Minimal user shape needed to decide whether to dispatch. Defined
+ * explicitly so the handler can run against either the global Prisma
+ * client or the per-worker singleton without re-deriving the type.
+ */
+export interface MoodReminderCandidate {
+  id: string;
+  timezone: string;
+  locale: string | null;
+  moodReminderEnabled: boolean;
+}
+
+export interface MoodReminderSummary {
+  candidatesScanned: number;
+  inWindow: number;
+  dispatched: number;
+  skippedAlreadyLogged: number;
+  skippedAlreadyDispatched: number;
+  skippedOutsideWindow: number;
+}
+
+function resolveLocale(locale: string | null | undefined): Locale {
+  return locale === "en" || locale === "de" ? locale : defaultLocale;
+}
+
+/**
+ * Pure decision predicate: should the worker fire a mood reminder for
+ * this user at this instant?
+ *
+ * Returns the local YYYY-MM-DD date string when the answer is "fire";
+ * returns `null` when the answer is "skip" — covers both
+ * "outside-window" and "opt-out". Callers branch on the return value.
+ *
+ * Pulled out as a pure helper so the unit tests can pin the
+ * window-boundary contract (21:59 → null, 22:00 → date, 22:59 → date,
+ * 23:00 → null) without touching the DB.
+ */
+export function evaluateMoodReminderWindow(
+  user: Pick<MoodReminderCandidate, "timezone" | "moodReminderEnabled">,
+  now: Date,
+): { fire: boolean; localDate: string | null; localHour: number } {
+  if (!user.moodReminderEnabled) {
+    return { fire: false, localDate: null, localHour: -1 };
+  }
+  const parts = getLocalDateParts(now, user.timezone || "Europe/Berlin");
+  const inWindow = parts.hour === MOOD_REMINDER_LOCAL_HOUR;
+  const isoDate = `${parts.year.toString().padStart(4, "0")}-${parts.month
+    .toString()
+    .padStart(2, "0")}-${parts.day.toString().padStart(2, "0")}`;
+  return {
+    fire: inWindow,
+    localDate: inWindow ? isoDate : null,
+    localHour: parts.hour,
+  };
+}
+
+/**
+ * Build the localised title + body for the mood reminder push. Pulled
+ * out so a future template change doesn't require re-running the whole
+ * handler in tests.
+ */
+export function buildMoodReminderPayload(locale: string | null | undefined): {
+  title: string;
+  body: string;
+} {
+  const t = getServerTranslator(resolveLocale(locale)).t;
+  return {
+    title: t("moodReminders.dailyTitle"),
+    body: t("moodReminders.dailyBody"),
+  };
+}
+
+/**
+ * Run one mood-reminder cron tick. Iterates every user with
+ * `moodReminderEnabled = true`, checks the per-user local-time window,
+ * and dispatches a `MOOD_REMINDER` notification when warranted.
+ *
+ * The dedup ledger (`MoodReminderDispatch`) is the idempotency anchor:
+ * the `(userId, date)` unique constraint guarantees that two parallel
+ * workers (or a re-tick inside the same hour) won't double-fire.
+ *
+ * Returns a summary so the worker can attach it to the wide-event for
+ * the observability dashboards.
+ */
+export async function runMoodReminderTick(
+  prisma: PrismaClient,
+  now: Date,
+  options: {
+    dispatch?: typeof dispatchNotification;
+  } = {},
+): Promise<MoodReminderSummary> {
+  const dispatchImpl = options.dispatch ?? dispatchNotification;
+
+  const summary: MoodReminderSummary = {
+    candidatesScanned: 0,
+    inWindow: 0,
+    dispatched: 0,
+    skippedAlreadyLogged: 0,
+    skippedAlreadyDispatched: 0,
+    skippedOutsideWindow: 0,
+  };
+
+  const candidates = await prisma.user.findMany({
+    where: { moodReminderEnabled: true },
+    select: {
+      id: true,
+      timezone: true,
+      locale: true,
+      moodReminderEnabled: true,
+    },
+  });
+
+  for (const user of candidates) {
+    summary.candidatesScanned += 1;
+    const decision = evaluateMoodReminderWindow(
+      {
+        timezone: user.timezone,
+        moodReminderEnabled: user.moodReminderEnabled,
+      },
+      now,
+    );
+
+    if (!decision.fire || !decision.localDate) {
+      summary.skippedOutsideWindow += 1;
+      continue;
+    }
+
+    summary.inWindow += 1;
+
+    // Already nudged today? The dedup row is the source of truth — if
+    // a previous tick succeeded, this branch swallows the work. We
+    // check before the MoodEntry lookup because the ledger query is
+    // strictly cheaper (single indexed row) than scanning today's
+    // mood entries.
+    const existingDispatch = await prisma.moodReminderDispatch.findUnique({
+      where: { userId_date: { userId: user.id, date: decision.localDate } },
+      select: { id: true },
+    });
+    if (existingDispatch) {
+      summary.skippedAlreadyDispatched += 1;
+      continue;
+    }
+
+    // Skip when the user already logged a mood for the local date. Same
+    // anchoring convention as `MoodEntry.date` (YYYY-MM-DD in the user's
+    // current timezone). Legacy rows that pre-date the `tz` column are
+    // already pinned to Europe/Berlin via the storage convention; here
+    // we accept whatever `date` string the row carries because the
+    // user-experience contract is "I logged today, don't nudge me".
+    const existingMood = await prisma.moodEntry.findFirst({
+      where: { userId: user.id, date: decision.localDate },
+      select: { id: true },
+    });
+    if (existingMood) {
+      summary.skippedAlreadyLogged += 1;
+      continue;
+    }
+
+    // Reserve the dedup row FIRST so a parallel worker that races us
+    // hits the unique-constraint violation and bails before fanning a
+    // duplicate push. We catch the P2002 unique-violation path
+    // explicitly because a "lost the race" outcome is not a worker
+    // error — it's the idempotency contract doing its job.
+    try {
+      await prisma.moodReminderDispatch.create({
+        data: { userId: user.id, date: decision.localDate },
+      });
+    } catch (err: unknown) {
+      // Prisma encodes unique-violation as `code === 'P2002'`. Detect
+      // by string-includes rather than instanceof so this module
+      // doesn't pull in the Prisma runtime types just for the guard.
+      const message = err instanceof Error ? err.message : String(err);
+      if (message.includes("P2002") || message.includes("Unique constraint")) {
+        summary.skippedAlreadyDispatched += 1;
+        continue;
+      }
+      throw err;
+    }
+
+    const { title, body } = buildMoodReminderPayload(user.locale);
+
+    await dispatchImpl({
+      eventType: "MOOD_REMINDER",
+      userId: user.id,
+      title,
+      message: body,
+      metadata: {
+        scheduledAt: now.toISOString(),
+        localDate: decision.localDate,
+      },
+    });
+
+    summary.dispatched += 1;
+  }
+
+  return summary;
+}
diff --git a/src/lib/jobs/reminder-worker.ts b/src/lib/jobs/reminder-worker.ts
index fe422d7a0..b03c24c62 100644
--- a/src/lib/jobs/reminder-worker.ts
+++ b/src/lib/jobs/reminder-worker.ts
@@ -83,6 +83,7 @@ import {
   getPhaseMessage,
   getPhaseKeyboard,
 } from "@/lib/jobs/reminder-phases";
+import { runMoodReminderTick } from "@/lib/jobs/mood-reminder";
 import { withBackgroundEvent } from "@/lib/logging/background";
 import { assertSubsystemEnabled } from "@/lib/process-type";
 import { runOffhostBackup } from "@/lib/jobs/offhost-backup";
@@ -179,6 +180,17 @@ const FEEDBACK_AGGREGATOR_CRON = "0 4 * * *";
 // fall to the drain.
 const DRAIN_CUMULATIVE_QUEUE = "drain-per-sample-cumulative";
 const DRAIN_CUMULATIVE_CRON = "45 3 * * *";
+// v0.5.4 ios-coord — daily mood-reminder cron.
+//
+// Runs every 15 minutes so the handler can pick up users whose local
+// time has just crossed 22:00 across any IANA timezone without having
+// to schedule one cron entry per zone. The handler short-circuits when
+// the user's local hour isn't 22, so the 15-min cadence translates to
+// ~4 ticks-per-hour × 1 actual-dispatch-window-per-user = at most one
+// push per user per day. Idempotency is enforced by the
+// `MoodReminderDispatch` ledger inside the handler.
+const MOOD_REMINDER_QUEUE = "mood-reminder-check";
+const MOOD_REMINDER_CRON = "*/15 * * * *";
 // v1.4.38 — the per-sample cutoff hours constant now lives on the
 // helper module so the worker, the admin route, and the CLI all read
 // the same source of truth. Re-export pulled in alongside
@@ -281,6 +293,10 @@ interface GeoBackfillPayload {
   triggeredAt: string;
 }
 
+interface MoodReminderPayload {
+  triggeredAt: string;
+}
+
 // Re-export timezone utilities under local names for backward compatibility
 const getUserTodayBounds = getUserTodayBoundsUtil;
 const getDayOfWeekInTz = getDayOfWeekInTzUtil;
@@ -559,6 +575,17 @@ async function handleReminderCheck(jobs: Job<ReminderCheckPayload>[]) {
               med.user.locale,
             );
 
+            // v0.5.4 — surface the window-start as an ISO 8601 string so
+            // the iOS notification handler can pin a "snooze 15 min"
+            // action against the actual schedule slot rather than the
+            // wall-clock moment APNs delivered. Computed in UTC from the
+            // user's localised window-start; mirrors the RED-phase
+            // `scheduledFor` field on the intake event.
+            const [winH, winM] = schedule.windowStart.split(":").map(Number);
+            const scheduledAtIso = new Date(
+              todayStart.getTime() + winH * 3600000 + winM * 60000,
+            ).toISOString();
+
             evt.addMeta(
               "notification_phase",
               `${currentPhase}:${med.name}:${schedule.windowStart}-${schedule.windowEnd}`,
@@ -575,6 +602,7 @@ async function handleReminderCheck(jobs: Job<ReminderCheckPayload>[]) {
                   scheduleId: schedule.id,
                   phase: currentPhase,
                   date: localDateStr,
+                  scheduledAt: scheduledAtIso,
                   replyMarkup: keyboard,
                 },
               });
@@ -717,9 +745,7 @@ async function handleWithingsActivitySync(
  * activity handler: per-user when the webhook fires, full-iteration
  * when the cron ticks.
  */
-async function handleWithingsSleepSync(
-  jobs: Job<WithingsSleepSyncPayload>[],
-) {
+async function handleWithingsSleepSync(jobs: Job<WithingsSleepSyncPayload>[]) {
   await withBackgroundEvent("job.withings_sleep_sync", async (evt) => {
     const prisma = getWorkerPrisma();
     try {
@@ -1107,6 +1133,39 @@ async function handleMoodLogSync(jobs: Job<MoodLogSyncPayload>[]) {
   });
 }
 
+/**
+ * v0.5.4 ios-coord — daily mood-reminder dispatcher.
+ *
+ * Delegates the dispatch decision to `runMoodReminderTick` in
+ * `mood-reminder.ts` so the unit tests can exercise the logic without
+ * spinning up pg-boss. The handler is a thin shim that wires the worker
+ * Prisma singleton + the wide-event sink to the pure function.
+ */
+async function handleMoodReminderCheck(jobs: Job<MoodReminderPayload>[]) {
+  void jobs;
+  await withBackgroundEvent("job.mood_reminder", async (evt) => {
+    const prisma = getWorkerPrisma();
+    try {
+      const summary = await runMoodReminderTick(prisma, new Date());
+      evt.setBackground({
+        task_name: "job.mood_reminder",
+        result: {
+          candidates_scanned: summary.candidatesScanned,
+          in_window: summary.inWindow,
+          dispatched: summary.dispatched,
+          skipped_already_logged: summary.skippedAlreadyLogged,
+          skipped_already_dispatched: summary.skippedAlreadyDispatched,
+          skipped_outside_window: summary.skippedOutsideWindow,
+        },
+      });
+    } catch (err) {
+      evt.setError(err);
+      recordError();
+      throw err;
+    }
+  });
+}
+
 async function handleRateLimitCleanup(jobs: Job<RateLimitCleanupPayload>[]) {
   void jobs;
   await withBackgroundEvent("job.rate_limit_cleanup", async (evt) => {
@@ -1248,8 +1307,10 @@ async function handlePrDetection(
       // users in that case. The push-suppression flag is irrelevant
       // for the cron path (the dispatcher's per-user opt-in handles
       // the loud/quiet decision once the row is written).
-      const payloadUserId = (job.data as PrDetectionPayload | undefined)?.userId;
-      const silent = (job.data as PrDetectionPayload | undefined)?.silent ?? false;
+      const payloadUserId = (job.data as PrDetectionPayload | undefined)
+        ?.userId;
+      const silent =
+        (job.data as PrDetectionPayload | undefined)?.silent ?? false;
       const userIds: string[] = payloadUserId
         ? [payloadUserId]
         : (await p.user.findMany({ select: { id: true } })).map((u) => u.id);
@@ -1560,6 +1621,11 @@ export async function startReminderWorker() {
     // this entry the drain schedule silently no-ops and the
     // per-sample APPLE_HEALTH rows never collapse.
     DRAIN_CUMULATIVE_QUEUE,
+    // v0.5.4 ios-coord — mood-reminder cron tick. Same pg-boss v12
+    // createQueue contract as the drain queue above; without this
+    // entry the every-15-min schedule silently no-ops and the
+    // dispatcher never fires.
+    MOOD_REMINDER_QUEUE,
   ];
 
   for (const q of allQueues) {
@@ -1573,11 +1639,7 @@ export async function startReminderWorker() {
   try {
     await reconcileOrphanImportJobs();
   } catch (err) {
-    workerLog(
-      "error",
-      "Failed to reconcile orphan ImportJob rows",
-      err,
-    );
+    workerLog("error", "Failed to reconcile orphan ImportJob rows", err);
   }
 
   // Schedule recurring cron jobs
@@ -1620,6 +1682,11 @@ export async function startReminderWorker() {
     // rows into one row per day per type. Slots between the
     // audit-log cleanup (03:15) and the feedback aggregator (04:00).
     [DRAIN_CUMULATIVE_QUEUE, DRAIN_CUMULATIVE_CRON],
+    // v0.5.4 ios-coord — every-15-min tick for the daily mood reminder.
+    // The handler short-circuits unless the candidate user's local
+    // time is the 22:00 hour, so the cron costs ~one user-row scan
+    // per tick for the entire opted-in cohort.
+    [MOOD_REMINDER_QUEUE, MOOD_REMINDER_CRON],
   ];
 
   for (const [name, cron] of schedules) {
@@ -1727,6 +1794,15 @@ export async function startReminderWorker() {
     { localConcurrency: 1 },
     handleGeoBackfill,
   );
+  // v0.5.4 ios-coord — single-flight worker. localConcurrency=1 keeps
+  // two reminder ticks from interleaving against the same user row;
+  // the dedup ledger would still save us, but skipping the race here
+  // avoids spurious P2002 errors in the wide-event log.
+  await boss.work<MoodReminderPayload>(
+    MOOD_REMINDER_QUEUE,
+    { localConcurrency: 1 },
+    handleMoodReminderCheck,
+  );
   await boss.work<PrDetectionPayload>(
     PR_DETECTION_QUEUE,
     { localConcurrency: PR_DETECTION_CONCURRENCY },
diff --git a/src/lib/notifications/senders/__tests__/apns.test.ts b/src/lib/notifications/senders/__tests__/apns.test.ts
index bc73f7930..151677353 100644
--- a/src/lib/notifications/senders/__tests__/apns.test.ts
+++ b/src/lib/notifications/senders/__tests__/apns.test.ts
@@ -39,6 +39,8 @@ vi.mock("@parse/node-apn", () => {
     public threadId: string | undefined;
     public collapseId: string | undefined;
     public payload: unknown;
+    public category: string | undefined;
+    public mutableContent: boolean | undefined;
     constructor() {
       notificationCtorMock();
     }
@@ -419,4 +421,68 @@ describe("sendViaApns — dispatcher fan-out", () => {
     const note = sendMock.mock.calls[0][0];
     expect(note.alert.body).toBe("take meds");
   });
+
+  it("forwards eventType as aps.category so iOS renders action buttons", async () => {
+    // Wires the v0.5.4 contract: MEDICATION_REMINDER on the server must
+    // surface as `aps.category = "MEDICATION_REMINDER"` so iOS looks up
+    // the UNNotificationCategory the app registered at launch and
+    // renders Take / Snooze 15 / Skip on the lock-screen.
+    vi.mocked(prisma.device.findMany).mockResolvedValueOnce([
+      { id: "d1", apnsToken: "tok-a", apnsEnvironment: "sandbox" },
+    ] as never);
+    sendMock.mockResolvedValueOnce({ sent: [{ device: "tok-a" }], failed: [] });
+    await sendViaApns("u-1", {
+      title: "t",
+      message: "m",
+      eventType: "MEDICATION_REMINDER",
+      metadata: { medicationId: "med-1", scheduleId: "sched-1" },
+    });
+    const note = sendMock.mock.calls[0][0];
+    expect(note.category).toBe("MEDICATION_REMINDER");
+    expect(note.mutableContent).toBe(true);
+    expect(note.threadId).toBe("MEDICATION_REMINDER");
+    expect(note.payload.medicationId).toBe("med-1");
+    expect(note.payload.scheduleId).toBe("sched-1");
+    expect(note.payload.eventType).toBe("MEDICATION_REMINDER");
+  });
+
+  it("forwards MOOD_REMINDER eventType as aps.category too", async () => {
+    // SR-2 contract: the mood-reminder daily job emits this event-type;
+    // the iOS app registers a `MOOD_REMINDER` category whose only
+    // action opens the mood-entry sheet.
+    vi.mocked(prisma.device.findMany).mockResolvedValueOnce([
+      { id: "d1", apnsToken: "tok-a", apnsEnvironment: "sandbox" },
+    ] as never);
+    sendMock.mockResolvedValueOnce({ sent: [{ device: "tok-a" }], failed: [] });
+    await sendViaApns("u-1", {
+      title: "Stimmung erfassen",
+      message: "Wie geht es dir heute?",
+      eventType: "MOOD_REMINDER",
+      metadata: { scheduledAt: "2026-05-17T20:00:00.000Z" },
+    });
+    const note = sendMock.mock.calls[0][0];
+    expect(note.category).toBe("MOOD_REMINDER");
+    expect(note.threadId).toBe("MOOD_REMINDER");
+    expect(note.payload.scheduledAt).toBe("2026-05-17T20:00:00.000Z");
+  });
+
+  it("forwards explicit category override on sendApnsPush", async () => {
+    // Lower-level entry — directly setting `payload.category` must
+    // propagate to `note.category` so callers that bypass `sendViaApns`
+    // (e.g. an admin test endpoint) keep full control.
+    setEnv(VALID_ENV);
+    sendMock.mockResolvedValueOnce({ sent: [{ device: "abc" }], failed: [] });
+    await sendApnsPush({
+      deviceToken: "abc",
+      environment: "sandbox",
+      payload: {
+        alert: { title: "t", body: "b" },
+        category: "CUSTOM_CATEGORY",
+        mutableContent: true,
+      },
+    });
+    const note = sendMock.mock.calls[0][0];
+    expect(note.category).toBe("CUSTOM_CATEGORY");
+    expect(note.mutableContent).toBe(true);
+  });
 });
diff --git a/src/lib/notifications/senders/apns.ts b/src/lib/notifications/senders/apns.ts
index aa4afeac2..cce0a0d20 100644
--- a/src/lib/notifications/senders/apns.ts
+++ b/src/lib/notifications/senders/apns.ts
@@ -40,6 +40,25 @@ export interface ApnsPayload {
   data?: Record<string, unknown>;
   /** APNs `aps.thread-id` — groups related alerts in Notification Center. */
   threadId?: string;
+  /**
+   * APNs `aps.category` — names a `UNNotificationCategory` registered by
+   * the iOS app at launch. The category drives the action-button row on
+   * the lock-screen / Notification Center entry. iOS HealthLog v0.5.3
+   * registers `MEDICATION_REMINDER` (Take / Snooze 15 / Skip) and
+   * `MOOD_REMINDER` (Log mood). Omit the field for plain alerts without
+   * actions.
+   */
+  category?: string;
+  /**
+   * Sets `aps.mutable-content = 1`. iOS routes the payload through the
+   * app's Notification Service Extension before the system renders it,
+   * giving the extension a chance to enrich the alert (e.g. download a
+   * thumbnail, decrypt a body). HealthLog doesn't ship an NSE yet, but
+   * the flag is cheap to set and a no-op without one — wiring it now
+   * means the iOS team can drop in an NSE later without a server-side
+   * roundtrip.
+   */
+  mutableContent?: boolean;
 }
 
 export interface ApnsSendInput {
@@ -229,6 +248,27 @@ export async function sendApnsPush(
   if (input.payload.threadId) {
     note.threadId = input.payload.threadId;
   }
+  if (input.payload.category) {
+    // node-apn's `category` setter writes through to `aps.category` —
+    // that's the key the iOS notification system reads to look up a
+    // `UNNotificationCategory` and render its action-button row. The
+    // category name is a plain string that must match an identifier
+    // registered by the iOS app at launch (see iOS HealthLog v0.5.3
+    // `NotificationCategories`).
+    //
+    // The cast is because node-apn 8.1's d.ts file omits the public
+    // setter (it only documents the matching `aps.category` field on
+    // the `Aps` interface), but the runtime setter on
+    // `apsProperties.js` writes the value through unchanged. We assign
+    // via the `category` setter rather than poking `note.aps.category`
+    // directly so we stay forward-compatible with future d.ts fixes.
+    (note as unknown as { category: string }).category = input.payload.category;
+  }
+  if (input.payload.mutableContent) {
+    // node-apn writes this through to `aps.mutable-content = 1`, which
+    // unlocks the iOS Notification Service Extension hook.
+    note.mutableContent = true;
+  }
   if (input.collapseId) {
     note.collapseId = input.collapseId;
   }
@@ -356,6 +396,17 @@ export async function sendViaApns(
           ...(payload.metadata ?? {}),
         },
         threadId: payload.eventType,
+        // The iOS app registers a `UNNotificationCategory` per event-type
+        // so the same string doubles as the category identifier. iOS
+        // ignores categories it doesn't know about, so adding the key
+        // here is safe for event-types that don't have an actionable
+        // category registered yet — they fall back to a plain alert.
+        category: payload.eventType,
+        // Future-proof for an iOS Notification Service Extension. iOS
+        // ignores the flag when no extension is registered, so it's a
+        // no-op on today's binary but unblocks NSE work without a
+        // server-side change.
+        mutableContent: true,
       },
       collapseId: payload.eventType,
     });
diff --git a/src/lib/notifications/types.ts b/src/lib/notifications/types.ts
index 241a6fac0..4b0bc9676 100644
--- a/src/lib/notifications/types.ts
+++ b/src/lib/notifications/types.ts
@@ -17,6 +17,12 @@ export const EVENT_TYPES = [
   // below) so a multi-year Apple Health backfill doesn't fire hundreds
   // of pushes during initial sync.
   "PERSONAL_RECORD",
+  // v0.5.4 ios-coord — daily mood-reminder nudge. Default OFF on the
+  // per-event policy (see DEFAULT_EVENT_PREFS) and additionally gated
+  // on the per-user `moodReminderEnabled` flag, so a user has to opt
+  // in twice before the server starts nudging them about an
+  // emotionally-loaded surface.
+  "MOOD_REMINDER",
 ] as const;
 export type EventType = (typeof EVENT_TYPES)[number];
 
@@ -38,6 +44,11 @@ export const EVENT_DEFAULT_ENABLED: Record<EventType, boolean> = {
   WITHINGS_SYNC_FAILED: true,
   SYSTEM_ALERT: true,
   PERSONAL_RECORD: false,
+  // v0.5.4 ios-coord — see note above on `EVENT_TYPES`. Default OFF
+  // is the safer posture: even if a future surface forgets to gate on
+  // `User.moodReminderEnabled`, this per-event default also has to be
+  // flipped on before the dispatcher will surface the channel.
+  MOOD_REMINDER: false,
 };
 
 export const CHANNEL_TYPE_LABELS: Record<ChannelType, string> = {