diff --git a/src/app/api/mood/analytics/__tests__/route.test.ts b/src/app/api/mood/analytics/__tests__/route.test.ts
new file mode 100644
index 000000000..7f80be156
--- /dev/null
+++ b/src/app/api/mood/analytics/__tests__/route.test.ts
@@ -0,0 +1,336 @@
+/**
+ * v1.4.39 W-MOOD — integration coverage for the rollup-tier read swap
+ * in `/api/mood/analytics`.
+ *
+ * Pins the parity contract the audit at
+ * `.planning/round-v1438-perf-analysis.md` §2.3 calls for: the
+ * response shape stays byte-identical when the rollup tier is warm,
+ * and falls back to the legacy live walk once when a legacy account
+ * has mood entries but no rollup rows yet.
+ *
+ * The fast path consumes `prisma.moodEntryRollup.findMany`; the
+ * coverage fallback consumes `prisma.moodEntry.findMany` (legacy
+ * shape). Both branches go through the `cached(caches.moodAnalytics)`
+ * LRU so the second read in a test must observe the same response.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("@/lib/db", () => ({
+  prisma: {
+    moodEntry: {
+      findMany: vi.fn(),
+      findFirst: vi.fn().mockResolvedValue(null),
+    },
+    moodEntryRollup: {
+      findMany: vi.fn(),
+      findFirst: vi.fn().mockResolvedValue(null),
+    },
+    $queryRawUnsafe: vi.fn().mockResolvedValue([]),
+  },
+}));
+
+vi.mock("@/lib/auth/session", () => ({ getSession: vi.fn() }));
+
+vi.mock("@/lib/auth/audit", () => ({
+  auditLog: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("@/lib/logging/transports", () => ({ emitIfSampled: vi.fn() }));
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("next/headers", () => ({
+  headers: vi.fn(async () => ({ get: () => null })),
+  cookies: vi.fn(async () => ({
+    get: () => undefined,
+    set: () => {},
+    delete: () => {},
+  })),
+}));
+
+// Stub the warm-up helper so test runs don't fire the real
+// `recomputeUserMoodRollups` aggregate. The warm-up is fire-and-
+// forget on the route so its return value is irrelevant for parity.
+vi.mock("@/lib/mood/rollups", async () => {
+  const actual = await vi.importActual<typeof import("@/lib/mood/rollups")>(
+    "@/lib/mood/rollups",
+  );
+  return {
+    ...actual,
+    ensureUserMoodRollupsFresh: vi.fn().mockResolvedValue({ recomputed: false }),
+  };
+});
+
+import { GET } from "../route";
+import { prisma } from "@/lib/db";
+import { getSession } from "@/lib/auth/session";
+import { __resetAllCachesForTests } from "@/lib/cache/server-cache";
+
+const SESSION_USER = {
+  id: "user-mood-1",
+  username: "marc",
+  role: "USER" as const,
+  timezone: "Europe/Berlin",
+  heightCm: 180,
+  dateOfBirth: new Date("1980-01-01T00:00:00Z"),
+  sourcePriorityJson: null,
+};
+
+const SESSION_OK = {
+  session: { id: "sess-1", expiresAt: new Date(Date.now() + 3_600_000) },
+  user: SESSION_USER as never,
+};
+
+const callGet = GET as unknown as (...args: never[]) => Promise<Response>;
+
+interface MoodAnalyticsBody {
+  data: {
+    entries: Array<{ date: string; score: number; samples: number }>;
+    summary: {
+      count: number;
+      latest: number | null;
+      min: number | null;
+      max: number | null;
+      mean: number | null;
+    };
+  };
+}
+
+beforeEach(() => {
+  vi.resetAllMocks();
+  __resetAllCachesForTests();
+  vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+  vi.mocked(prisma.moodEntry.findMany).mockResolvedValue([] as never);
+  vi.mocked(prisma.moodEntryRollup.findMany).mockResolvedValue([] as never);
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("GET /api/mood/analytics", () => {
+  it("returns an empty envelope for a brand-new user with zero rollups and zero raw entries", async () => {
+    // Both branches return an empty result: rollup tier empty, raw
+    // mood-entry table empty. The legacy `entries` array is also
+    // empty so the response is identical to the pre-swap shape.
+    const res = await callGet();
+    expect(res.status).toBe(200);
+    const body = (await res.json()) as MoodAnalyticsBody;
+    expect(body.data.entries).toEqual([]);
+    expect(body.data.summary.count).toBe(0);
+    expect(body.data.summary.latest).toBeNull();
+    expect(body.data.summary.min).toBeNull();
+    expect(body.data.summary.max).toBeNull();
+    expect(body.data.summary.mean).toBeNull();
+  });
+
+  it("consumes the rollup tier when DAY rows exist and skips the raw findMany", async () => {
+    // One DAY-rollup row per calendar day, three days running.
+    vi.mocked(prisma.moodEntryRollup.findMany).mockResolvedValue([
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-08T00:00:00.000Z"),
+        count: 1,
+        mean: 4,
+        minScore: 4,
+        maxScore: 4,
+        sd: null,
+        computedAt: new Date(),
+      },
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-09T00:00:00.000Z"),
+        count: 1,
+        mean: 5,
+        minScore: 5,
+        maxScore: 5,
+        sd: null,
+        computedAt: new Date(),
+      },
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-10T00:00:00.000Z"),
+        count: 2,
+        mean: 4.5,
+        minScore: 4,
+        maxScore: 5,
+        sd: 0.5,
+        computedAt: new Date(),
+      },
+    ] as never);
+
+    const res = await callGet();
+    expect(res.status).toBe(200);
+
+    // The raw `moodEntry.findMany` must not fire on the fast path.
+    expect(prisma.moodEntry.findMany).not.toHaveBeenCalled();
+
+    const body = (await res.json()) as MoodAnalyticsBody;
+    expect(body.data.entries).toEqual([
+      { date: "2026-05-08", score: 4, samples: 1 },
+      { date: "2026-05-09", score: 5, samples: 1 },
+      { date: "2026-05-10", score: 4.5, samples: 2 },
+    ]);
+    expect(body.data.summary.count).toBe(3);
+    expect(body.data.summary.latest).toBe(4.5);
+    expect(body.data.summary.min).toBe(4);
+    expect(body.data.summary.max).toBe(5);
+  });
+
+  it("falls back to the live findMany once when the rollup tier is empty but mood entries exist", async () => {
+    // Coverage-fallback: legacy account with raw entries but no
+    // rollup coverage yet. The route runs the legacy walk once;
+    // the warm-up helper is supposed to fire asynchronously
+    // (stubbed above).
+    vi.mocked(prisma.moodEntryRollup.findMany).mockResolvedValue([] as never);
+    vi.mocked(prisma.moodEntry.findMany).mockResolvedValue([
+      {
+        date: "2026-05-08",
+        score: 4,
+        moodLoggedAt: new Date("2026-05-08T12:00:00.000Z"),
+      },
+      {
+        date: "2026-05-09",
+        score: 5,
+        moodLoggedAt: new Date("2026-05-09T12:00:00.000Z"),
+      },
+    ] as never);
+
+    const res = await callGet();
+    expect(res.status).toBe(200);
+
+    // Live fallback fired exactly once.
+    expect(prisma.moodEntry.findMany).toHaveBeenCalledTimes(1);
+
+    const body = (await res.json()) as MoodAnalyticsBody;
+    expect(body.data.entries).toEqual([
+      { date: "2026-05-08", score: 4, samples: 1 },
+      { date: "2026-05-09", score: 5, samples: 1 },
+    ]);
+    expect(body.data.summary.count).toBe(2);
+    expect(body.data.summary.latest).toBe(5);
+  });
+
+  it("serves the cached envelope on a warm read without touching the DB", async () => {
+    // First read populates the cache.
+    vi.mocked(prisma.moodEntryRollup.findMany).mockResolvedValue([
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-10T00:00:00.000Z"),
+        count: 1,
+        mean: 4,
+        minScore: 4,
+        maxScore: 4,
+        sd: null,
+        computedAt: new Date(),
+      },
+    ] as never);
+
+    const first = await callGet();
+    expect(first.status).toBe(200);
+    expect(prisma.moodEntryRollup.findMany).toHaveBeenCalledTimes(1);
+
+    // Second read hits the LRU and never touches Prisma again.
+    const second = await callGet();
+    expect(second.status).toBe(200);
+    expect(prisma.moodEntryRollup.findMany).toHaveBeenCalledTimes(1);
+
+    const firstBody = (await first.json()) as MoodAnalyticsBody;
+    const secondBody = (await second.json()) as MoodAnalyticsBody;
+    expect(secondBody).toEqual(firstBody);
+  });
+
+  it("emits byte-identical entries + summary shape between rollup tier and live fallback for the same canonical data", async () => {
+    // Same one-entry-per-day series, surfaced once via the rollup
+    // tier and once via the legacy live walk. Response shape is
+    // expected to be byte-compatible — the rollup carries the
+    // pre-aggregated daily mean which is precisely what
+    // aggregateDailyAverages would produce from a single entry
+    // per day.
+    const canonicalEntries = [
+      {
+        date: "2026-05-08",
+        score: 3,
+        moodLoggedAt: new Date("2026-05-08T12:00:00.000Z"),
+      },
+      {
+        date: "2026-05-09",
+        score: 4,
+        moodLoggedAt: new Date("2026-05-09T12:00:00.000Z"),
+      },
+      {
+        date: "2026-05-10",
+        score: 5,
+        moodLoggedAt: new Date("2026-05-10T12:00:00.000Z"),
+      },
+    ];
+
+    // Live-fallback request first (rollup empty + raw populated).
+    vi.mocked(prisma.moodEntryRollup.findMany).mockResolvedValue([] as never);
+    vi.mocked(prisma.moodEntry.findMany).mockResolvedValue(
+      canonicalEntries as never,
+    );
+    const liveRes = await callGet();
+    const liveBody = (await liveRes.json()) as MoodAnalyticsBody;
+
+    // Bust the cache before the rollup-tier read so the second call
+    // re-evaluates the read path with the rollup populated.
+    __resetAllCachesForTests();
+
+    vi.mocked(prisma.moodEntryRollup.findMany).mockResolvedValue([
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-08T00:00:00.000Z"),
+        count: 1,
+        mean: 3,
+        minScore: 3,
+        maxScore: 3,
+        sd: null,
+        computedAt: new Date(),
+      },
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-09T00:00:00.000Z"),
+        count: 1,
+        mean: 4,
+        minScore: 4,
+        maxScore: 4,
+        sd: null,
+        computedAt: new Date(),
+      },
+      {
+        userId: "user-mood-1",
+        granularity: "DAY",
+        bucketStart: new Date("2026-05-10T00:00:00.000Z"),
+        count: 1,
+        mean: 5,
+        minScore: 5,
+        maxScore: 5,
+        sd: null,
+        computedAt: new Date(),
+      },
+    ] as never);
+    const rollupRes = await callGet();
+    const rollupBody = (await rollupRes.json()) as MoodAnalyticsBody;
+
+    // `entries` shape — date / score / samples — must be byte-identical.
+    expect(rollupBody.data.entries).toEqual(liveBody.data.entries);
+    // Summary core stats must match (count / min / max / mean /
+    // latest). Slope windows depend on Date.now() so we don't compare
+    // those — they are deterministic for the same input and the
+    // input is identical here.
+    expect(rollupBody.data.summary.count).toBe(liveBody.data.summary.count);
+    expect(rollupBody.data.summary.latest).toBe(liveBody.data.summary.latest);
+    expect(rollupBody.data.summary.min).toBe(liveBody.data.summary.min);
+    expect(rollupBody.data.summary.max).toBe(liveBody.data.summary.max);
+    expect(rollupBody.data.summary.mean).toBe(liveBody.data.summary.mean);
+  });
+});
diff --git a/src/lib/mood/__tests__/rollups.test.ts b/src/lib/mood/__tests__/rollups.test.ts
new file mode 100644
index 000000000..8239eb9a2
--- /dev/null
+++ b/src/lib/mood/__tests__/rollups.test.ts
@@ -0,0 +1,398 @@
+/**
+ * v1.4.39 W-MOOD — unit tests for the persistent mood-rollup
+ * populator.
+ *
+ * `prisma` is mocked at the module level so we can pin:
+ *   - the DAY-bucket sync recompute writes through the upsert path,
+ *   - `recomputeMoodBucketsForEntry` is idempotent under re-run,
+ *   - `enqueueMoodRollupRecompute` calls `boss.send` with the
+ *     documented queue + singleton-key shape, and is a silent no-op
+ *     when no boss is attached,
+ *   - `ensureUserMoodRollupsFresh` short-circuits on fresh data and
+ *     dedups concurrent callers onto one in-flight promise,
+ *   - the boot-time backfill discovers users with mood entries but
+ *     no rollup coverage and enqueues one job per uncovered user.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+// vi.mock factories run BEFORE module-level statements due to hoisting,
+// so the mock fns must live inside the factory closure. We re-export
+// them through `vi.hoisted` so the test body can reach them after.
+const mocks = vi.hoisted(() => ({
+  queryRaw: vi.fn(),
+  queryRawUnsafe: vi.fn(),
+  upsert: vi.fn(),
+  deleteMany: vi.fn(),
+  findFirst: vi.fn(),
+  findMany: vi.fn(),
+  findFirstMoodEntry: vi.fn(),
+  bossSend: vi.fn(),
+  getGlobalBossMock: vi.fn(),
+}));
+
+vi.mock("@/lib/db", () => ({
+  prisma: {
+    $queryRaw: mocks.queryRaw,
+    $queryRawUnsafe: mocks.queryRawUnsafe,
+    moodEntryRollup: {
+      upsert: mocks.upsert,
+      deleteMany: mocks.deleteMany,
+      findFirst: mocks.findFirst,
+      findMany: mocks.findMany,
+    },
+    moodEntry: {
+      findFirst: mocks.findFirstMoodEntry,
+    },
+  },
+}));
+
+vi.mock("@/lib/jobs/boss-instance", () => ({
+  getGlobalBoss: () => mocks.getGlobalBossMock(),
+}));
+
+vi.mock("@/lib/logging/context", () => ({
+  annotate: vi.fn(),
+}));
+
+import { annotate } from "@/lib/logging/context";
+
+const {
+  queryRaw,
+  queryRawUnsafe,
+  upsert,
+  deleteMany,
+  findFirst,
+  findFirstMoodEntry,
+  bossSend,
+  getGlobalBossMock,
+} = mocks;
+// `findMany` is wired in so indirect lookups don't throw; the
+// populator tests below exercise the `$queryRawUnsafe` + upsert
+// paths so the reference stays unused inside this file.
+void mocks.findMany;
+void queryRaw;
+
+import {
+  MOOD_ROLLUP_FULL_BACKFILL_QUEUE,
+  MOOD_ROLLUP_RECOMPUTE_QUEUE,
+  _resetEnsureUserMoodRollupsFreshInFlightForTests,
+  enqueueBootTimeMoodRollupBackfill,
+  enqueueMoodRollupRecompute,
+  ensureUserMoodRollupsFresh,
+  recomputeMoodBucketsForEntry,
+} from "../rollups";
+
+beforeEach(() => {
+  queryRaw.mockReset();
+  queryRawUnsafe.mockReset();
+  upsert.mockReset();
+  deleteMany.mockReset();
+  findFirst.mockReset();
+  mocks.findMany.mockReset();
+  findFirstMoodEntry.mockReset();
+  bossSend.mockReset();
+  getGlobalBossMock.mockReset();
+  // v1.4.39 — clear the per-userId in-flight map so a previous
+  // test's resolved promise does not short-circuit the next test.
+  _resetEnsureUserMoodRollupsFreshInFlightForTests();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("recomputeMoodBucketsForEntry", () => {
+  it("upserts the DAY rollup synchronously and enqueues WEEK/MONTH/YEAR", async () => {
+    queryRawUnsafe.mockResolvedValueOnce([
+      {
+        bucket_start: new Date("2026-05-10T00:00:00.000Z"),
+        count: BigInt(3),
+        mean: 4.0,
+        min_score: 3,
+        max_score: 5,
+        sd: 0.82,
+      },
+    ]);
+    getGlobalBossMock.mockReturnValue({ send: bossSend });
+    bossSend.mockResolvedValue("job-id");
+
+    await recomputeMoodBucketsForEntry(
+      "user-1",
+      new Date("2026-05-10T14:30:00.000Z"),
+    );
+
+    // DAY pass — single upsert against the rollup table.
+    expect(upsert).toHaveBeenCalledTimes(1);
+    const upsertArg = upsert.mock.calls[0][0];
+    expect(upsertArg.where.userId_granularity_bucketStart.userId).toBe(
+      "user-1",
+    );
+    expect(upsertArg.where.userId_granularity_bucketStart.granularity).toBe(
+      "DAY",
+    );
+    expect(upsertArg.create.count).toBe(3);
+    expect(upsertArg.create.mean).toBe(4);
+    expect(upsertArg.create.minScore).toBe(3);
+    expect(upsertArg.create.maxScore).toBe(5);
+    expect(upsertArg.create.sd).toBeCloseTo(0.82);
+
+    // WEEK / MONTH / YEAR — three enqueues against the worker queue.
+    expect(bossSend).toHaveBeenCalledTimes(3);
+    for (const call of bossSend.mock.calls) {
+      expect(call[0]).toBe(MOOD_ROLLUP_RECOMPUTE_QUEUE);
+      expect(call[1].userId).toBe("user-1");
+      expect(["WEEK", "MONTH", "YEAR"]).toContain(call[1].granularity);
+    }
+  });
+
+  it("deletes the DAY row when the post-mutation aggregate is empty", async () => {
+    // Post-delete recompute: the day now has zero mood rows.
+    queryRawUnsafe.mockResolvedValueOnce([]);
+    getGlobalBossMock.mockReturnValue(null);
+
+    await recomputeMoodBucketsForEntry(
+      "user-1",
+      new Date("2026-05-10T14:30:00.000Z"),
+    );
+
+    expect(deleteMany).toHaveBeenCalledTimes(1);
+    expect(deleteMany.mock.calls[0][0].where.userId).toBe("user-1");
+    expect(deleteMany.mock.calls[0][0].where.granularity).toBe("DAY");
+    expect(upsert).not.toHaveBeenCalled();
+  });
+
+  it("is idempotent under re-run for the same (user, day)", async () => {
+    // Two consecutive calls with the same aggregate output should
+    // result in two upserts that both carry the same payload — the
+    // composite PK absorbs the second write into a no-op refresh on
+    // the database side, but the populator must keep firing the
+    // upsert each time (no in-memory dedup) so a real Postgres-side
+    // change is picked up on the next call.
+    const aggregate = [
+      {
+        bucket_start: new Date("2026-05-10T00:00:00.000Z"),
+        count: BigInt(2),
+        mean: 4.5,
+        min_score: 4,
+        max_score: 5,
+        sd: 0.5,
+      },
+    ];
+    queryRawUnsafe.mockResolvedValue(aggregate);
+    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"),
+    );
+
+    expect(upsert).toHaveBeenCalledTimes(2);
+    const firstPayload = upsert.mock.calls[0][0].create;
+    const secondPayload = upsert.mock.calls[1][0].create;
+    expect(firstPayload.count).toBe(secondPayload.count);
+    expect(firstPayload.mean).toBe(secondPayload.mean);
+    expect(firstPayload.minScore).toBe(secondPayload.minScore);
+    expect(firstPayload.maxScore).toBe(secondPayload.maxScore);
+  });
+});
+
+describe("enqueueMoodRollupRecompute", () => {
+  it("is a silent no-op when no boss is attached", async () => {
+    getGlobalBossMock.mockReturnValue(null);
+    await enqueueMoodRollupRecompute({
+      userId: "user-1",
+      granularity: "WEEK",
+      from: new Date("2026-05-04T00:00:00.000Z"),
+      to: new Date("2026-05-11T00:00:00.000Z"),
+    });
+    expect(bossSend).not.toHaveBeenCalled();
+  });
+
+  it("sends with the documented queue + singleton-key shape", async () => {
+    getGlobalBossMock.mockReturnValue({ send: bossSend });
+    bossSend.mockResolvedValue("job-1");
+    const from = new Date("2026-05-04T00:00:00.000Z");
+    await enqueueMoodRollupRecompute({
+      userId: "user-9",
+      granularity: "WEEK",
+      from,
+      to: new Date("2026-05-11T00:00:00.000Z"),
+    });
+    expect(bossSend).toHaveBeenCalledTimes(1);
+    const [queue, payload, opts] = bossSend.mock.calls[0];
+    expect(queue).toBe(MOOD_ROLLUP_RECOMPUTE_QUEUE);
+    expect(payload.userId).toBe("user-9");
+    expect(payload.granularity).toBe("WEEK");
+    expect(payload.from).toBe(from.toISOString());
+    expect(opts.singletonKey).toBe(`user-9|WEEK|${from.toISOString()}`);
+  });
+});
+
+describe("ensureUserMoodRollupsFresh", () => {
+  it("is a no-op when the user has no mood entries", async () => {
+    findFirst.mockResolvedValueOnce(null);
+    findFirstMoodEntry.mockResolvedValueOnce(null);
+    const result = await ensureUserMoodRollupsFresh("user-1");
+    expect(result.recomputed).toBe(false);
+    expect(queryRawUnsafe).not.toHaveBeenCalled();
+  });
+
+  it("is a no-op when the rollup is already ahead of the newest mood entry", async () => {
+    const rollupAt = new Date("2026-05-10T12:00:00.000Z");
+    const entryAt = new Date("2026-05-10T11:00:00.000Z");
+    findFirst.mockResolvedValueOnce({ computedAt: rollupAt });
+    findFirstMoodEntry.mockResolvedValueOnce({
+      updatedAt: entryAt,
+      moodLoggedAt: entryAt,
+    });
+    const result = await ensureUserMoodRollupsFresh("user-1");
+    expect(result.recomputed).toBe(false);
+    expect(queryRawUnsafe).not.toHaveBeenCalled();
+  });
+
+  it("triggers a DAY-window recompute when stale", async () => {
+    const rollupAt = new Date("2026-05-10T10:00:00.000Z");
+    const entryAt = new Date("2026-05-10T12:00:00.000Z");
+    findFirst.mockResolvedValueOnce({ computedAt: rollupAt });
+    findFirstMoodEntry.mockResolvedValueOnce({
+      updatedAt: entryAt,
+      moodLoggedAt: entryAt,
+    });
+    queryRawUnsafe.mockResolvedValueOnce([]);
+    const result = await ensureUserMoodRollupsFresh("user-1");
+    expect(result.recomputed).toBe(true);
+    expect(queryRawUnsafe).toHaveBeenCalledTimes(1);
+  });
+
+  it("swallows populator errors so the read path never fails", async () => {
+    findFirst.mockRejectedValueOnce(new Error("pool exhausted"));
+    findFirstMoodEntry.mockRejectedValueOnce(new Error("pool exhausted"));
+    const consoleSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    const result = await ensureUserMoodRollupsFresh("user-1");
+    expect(result.recomputed).toBe(false);
+    consoleSpy.mockRestore();
+  });
+
+  it("dedups concurrent callers for the same userId onto one in-flight promise", async () => {
+    const rollupAt = new Date("2026-05-10T10:00:00.000Z");
+    const entryAt = new Date("2026-05-10T12:00:00.000Z");
+    findFirst.mockResolvedValue({ computedAt: rollupAt });
+    findFirstMoodEntry.mockResolvedValue({
+      updatedAt: entryAt,
+      moodLoggedAt: entryAt,
+    });
+    queryRawUnsafe.mockResolvedValue([]);
+
+    const [a, b, c] = await Promise.all([
+      ensureUserMoodRollupsFresh("user-1"),
+      ensureUserMoodRollupsFresh("user-1"),
+      ensureUserMoodRollupsFresh("user-1"),
+    ]);
+    expect(a.recomputed).toBe(true);
+    expect(b.recomputed).toBe(true);
+    expect(c.recomputed).toBe(true);
+    expect(queryRawUnsafe).toHaveBeenCalledTimes(1);
+    expect(findFirst).toHaveBeenCalledTimes(1);
+    expect(findFirstMoodEntry).toHaveBeenCalledTimes(1);
+  });
+
+  it("annotates the failure when the inner recompute throws", async () => {
+    const rollupAt = new Date("2026-05-10T10:00:00.000Z");
+    const entryAt = new Date("2026-05-10T12:00:00.000Z");
+    findFirst.mockResolvedValueOnce({ computedAt: rollupAt });
+    findFirstMoodEntry.mockResolvedValueOnce({
+      updatedAt: entryAt,
+      moodLoggedAt: entryAt,
+    });
+    queryRawUnsafe.mockRejectedValueOnce(new Error("deadlock detected"));
+
+    const consoleSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+
+    const result = await ensureUserMoodRollupsFresh("user-1");
+
+    expect(result.recomputed).toBe(false);
+    expect(annotate).toHaveBeenCalledWith({
+      meta: {
+        mood_rollup_refresh_failed: true,
+        mood_rollup_refresh_error: "deadlock detected",
+      },
+    });
+    expect(consoleSpy).toHaveBeenCalled();
+    consoleSpy.mockRestore();
+  });
+});
+
+describe("enqueueBootTimeMoodRollupBackfill", () => {
+  it("is a silent no-op when no boss is attached", async () => {
+    getGlobalBossMock.mockReturnValue(null);
+    const result = await enqueueBootTimeMoodRollupBackfill();
+    expect(result).toEqual({ enqueued: 0, skipped: 0, error: null });
+    expect(queryRaw).not.toHaveBeenCalled();
+    expect(bossSend).not.toHaveBeenCalled();
+  });
+
+  it("enqueues one full-fold job per user with mood entries but no rollups", async () => {
+    getGlobalBossMock.mockReturnValue({ send: bossSend });
+    queryRaw.mockResolvedValueOnce([
+      { id: "user-a" },
+      { id: "user-b" },
+      { id: "user-c" },
+    ]);
+    bossSend
+      .mockResolvedValueOnce("job-a")
+      .mockResolvedValueOnce("job-b")
+      .mockResolvedValueOnce("job-c");
+
+    const result = await enqueueBootTimeMoodRollupBackfill();
+
+    expect(result).toEqual({ enqueued: 3, skipped: 0, error: null });
+    expect(bossSend).toHaveBeenCalledTimes(3);
+    for (const call of bossSend.mock.calls) {
+      expect(call[0]).toBe(MOOD_ROLLUP_FULL_BACKFILL_QUEUE);
+    }
+    expect(bossSend.mock.calls[0][2].singletonKey).toBe(
+      "mood-boot-backfill|user-a",
+    );
+    expect(bossSend.mock.calls[1][2].singletonKey).toBe(
+      "mood-boot-backfill|user-b",
+    );
+    expect(bossSend.mock.calls[2][2].singletonKey).toBe(
+      "mood-boot-backfill|user-c",
+    );
+  });
+
+  it("counts a `boss.send` returning null as 'skipped' (singleton coalesce)", async () => {
+    getGlobalBossMock.mockReturnValue({ send: bossSend });
+    queryRaw.mockResolvedValueOnce([{ id: "user-a" }, { id: "user-b" }]);
+    bossSend.mockResolvedValueOnce(null).mockResolvedValueOnce("job-b");
+
+    const result = await enqueueBootTimeMoodRollupBackfill();
+
+    expect(result).toEqual({ enqueued: 1, skipped: 1, error: null });
+  });
+
+  it("returns the error message when the discovery query throws", async () => {
+    getGlobalBossMock.mockReturnValue({ send: bossSend });
+    queryRaw.mockRejectedValueOnce(new Error("pool exhausted"));
+
+    const result = await enqueueBootTimeMoodRollupBackfill();
+
+    expect(result.enqueued).toBe(0);
+    expect(result.error).toBe("pool exhausted");
+    expect(bossSend).not.toHaveBeenCalled();
+  });
+
+  it("returns { enqueued: 0 } when no users need backfill", async () => {
+    getGlobalBossMock.mockReturnValue({ send: bossSend });
+    queryRaw.mockResolvedValueOnce([]);
+
+    const result = await enqueueBootTimeMoodRollupBackfill();
+
+    expect(result).toEqual({ enqueued: 0, skipped: 0, error: null });
+    expect(bossSend).not.toHaveBeenCalled();
+  });
+});