diff --git a/src/lib/insights/__tests__/recovery-score.test.ts b/src/lib/insights/__tests__/recovery-score.test.ts
index a705d9191..ac2b39a51 100644
--- a/src/lib/insights/__tests__/recovery-score.test.ts
+++ b/src/lib/insights/__tests__/recovery-score.test.ts
@@ -68,16 +68,17 @@ beforeEach(() => {
 });
 
 describe("recovery-score helpers", () => {
-  it("keys the day + externalId by the UTC calendar day", () => {
-    expect(recoveryDayKey(NOW)).toBe("2026-06-02");
+  it("scores the PREVIOUS UTC day (cron fires in the small hours)", () => {
+    // NOW is 2026-06-02 → the scored day is the just-completed 2026-06-01.
+    expect(recoveryDayKey(NOW)).toBe("2026-06-01");
     expect(recoveryExternalId(NOW)).toBe(
-      `${RECOVERY_SCORE_EXTERNAL_ID_PREFIX}2026-06-02`,
+      `${RECOVERY_SCORE_EXTERNAL_ID_PREFIX}2026-06-01`,
     );
   });
 
-  it("anchors the canonical timestamp at noon UTC on the scored day", () => {
+  it("anchors the canonical timestamp at noon UTC on the scored (previous) day", () => {
     expect(recoveryMeasuredAt(NOW).toISOString()).toBe(
-      "2026-06-02T12:00:00.000Z",
+      "2026-06-01T12:00:00.000Z",
     );
   });
 });
@@ -96,7 +97,7 @@ describe("persistRecoveryScore", () => {
       userId: "user-1",
       type: "RECOVERY_SCORE",
       source: "COMPUTED",
-      externalId: "recovery:2026-06-02",
+      externalId: "recovery:2026-06-01",
     });
     expect(arg.create).toMatchObject({
       userId: "user-1",
@@ -104,7 +105,7 @@ describe("persistRecoveryScore", () => {
       source: "COMPUTED",
       value: 72,
       unit: "score",
-      externalId: "recovery:2026-06-02",
+      externalId: "recovery:2026-06-01",
     });
     expect(arg.update).toMatchObject({ value: 72 });
   });
diff --git a/src/lib/insights/__tests__/score-row.test.ts b/src/lib/insights/__tests__/score-row.test.ts
new file mode 100644
index 000000000..63c4fb4f6
--- /dev/null
+++ b/src/lib/insights/__tests__/score-row.test.ts
@@ -0,0 +1,148 @@
+/**
+ * v1.10.0 QA — shared score-row helpers.
+ *
+ * Pins the "score the PREVIOUS UTC day" contract (the cron fires ~03 UTC, so
+ * scoring the current UTC day would miss a just-completed day's data), the
+ * noon-UTC measuredAt, the prefixed externalId, the idempotent upsert, and
+ * the cohort tally / one-bad-user-does-not-block-the-rest guarantee of
+ * `runScoreBatch`.
+ */
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+const annotateMock = vi.fn();
+vi.mock("@/lib/logging/context", () => ({
+  annotate: (...args: unknown[]) => annotateMock(...args),
+}));
+
+import {
+  scoreDayKey,
+  scoreMeasuredAt,
+  scoreExternalId,
+  upsertScoreRow,
+  runScoreBatch,
+} from "../score-row";
+
+beforeEach(() => vi.clearAllMocks());
+
+describe("scoreDayKey — previous UTC day", () => {
+  it("a 03:00 UTC run scores the prior calendar day", () => {
+    // 04:45 Europe/Berlin (summer) ≈ 02:45 UTC; a 03:00 UTC tick is the cron
+    // moment. The scored day must be the day that just ended.
+    const now = new Date("2026-06-02T03:00:00Z");
+    expect(scoreDayKey(now)).toBe("2026-06-01");
+  });
+
+  it("crosses a month boundary correctly", () => {
+    const now = new Date("2026-07-01T02:50:00Z");
+    expect(scoreDayKey(now)).toBe("2026-06-30");
+  });
+
+  it("crosses a year boundary correctly", () => {
+    const now = new Date("2027-01-01T03:00:00Z");
+    expect(scoreDayKey(now)).toBe("2026-12-31");
+  });
+});
+
+describe("scoreMeasuredAt / scoreExternalId", () => {
+  const now = new Date("2026-06-02T03:00:00Z");
+  it("anchors the row at noon UTC on the scored (previous) day", () => {
+    expect(scoreMeasuredAt(now).toISOString()).toBe("2026-06-01T12:00:00.000Z");
+  });
+  it("builds the prefixed externalId over the scored day", () => {
+    expect(scoreExternalId("recovery:", now)).toBe("recovery:2026-06-01");
+    expect(scoreExternalId("strain:", now)).toBe("strain:2026-06-01");
+  });
+});
+
+describe("upsertScoreRow", () => {
+  it("upserts on the (userId, type, COMPUTED, externalId) key with the prev-day stamp", async () => {
+    const upsert = vi.fn().mockResolvedValue({});
+    const prisma = {
+      measurement: { upsert },
+    } as unknown as Parameters<typeof upsertScoreRow>[0];
+    const now = new Date("2026-06-02T03:00:00Z");
+
+    await upsertScoreRow(prisma, {
+      userId: "u1",
+      type: "RECOVERY_SCORE",
+      externalIdPrefix: "recovery:",
+      score: 77,
+      now,
+    });
+
+    const arg = upsert.mock.calls[0][0];
+    expect(arg.where.userId_type_source_externalId).toEqual({
+      userId: "u1",
+      type: "RECOVERY_SCORE",
+      source: "COMPUTED",
+      externalId: "recovery:2026-06-01",
+    });
+    expect(arg.create).toMatchObject({
+      type: "RECOVERY_SCORE",
+      source: "COMPUTED",
+      value: 77,
+      unit: "score",
+      externalId: "recovery:2026-06-01",
+    });
+    expect(arg.create.measuredAt.toISOString()).toBe(
+      "2026-06-01T12:00:00.000Z",
+    );
+    expect(arg.update).toEqual({
+      value: 77,
+      measuredAt: arg.create.measuredAt,
+    });
+  });
+});
+
+describe("runScoreBatch", () => {
+  const NOW = new Date("2026-06-02T03:00:00Z");
+
+  it("tallies stored vs insufficient and annotates", async () => {
+    const persist = vi
+      .fn()
+      .mockResolvedValueOnce({ outcome: "stored" })
+      .mockResolvedValueOnce({ outcome: "insufficient" })
+      .mockResolvedValueOnce({ outcome: "stored" });
+
+    const result = await runScoreBatch(
+      ["a", "b", "c"],
+      NOW,
+      persist,
+      "insights.recovery.compute",
+    );
+
+    expect(result).toEqual({
+      considered: 3,
+      stored: 2,
+      insufficient: 1,
+      errored: 0,
+    });
+    expect(annotateMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        action: expect.objectContaining({ name: "insights.recovery.compute" }),
+      }),
+    );
+  });
+
+  it("counts a per-user error and keeps processing the cohort", async () => {
+    const persist = vi
+      .fn()
+      .mockRejectedValueOnce(new Error("boom"))
+      .mockResolvedValueOnce({ outcome: "stored" });
+
+    const result = await runScoreBatch(["a", "b"], NOW, persist, "x.compute");
+
+    expect(result).toEqual({
+      considered: 2,
+      stored: 1,
+      insufficient: 0,
+      errored: 1,
+    });
+  });
+
+  it("passes the run `now` through to the persist function", async () => {
+    const persist = vi.fn().mockResolvedValue({ outcome: "stored" });
+    await runScoreBatch(["a"], NOW, persist, "x.compute");
+    expect(persist).toHaveBeenCalledWith("a", NOW);
+  });
+});
diff --git a/src/lib/insights/__tests__/strain-score.test.ts b/src/lib/insights/__tests__/strain-score.test.ts
index 1b26a91f5..4be24fe01 100644
--- a/src/lib/insights/__tests__/strain-score.test.ts
+++ b/src/lib/insights/__tests__/strain-score.test.ts
@@ -28,16 +28,18 @@ beforeEach(() => {
 });
 
 describe("strain-score helpers", () => {
-  it("keys the day + externalId by the UTC calendar day", () => {
-    expect(strainDayKey(NOW)).toBe("2026-06-02");
+  it("scores the PREVIOUS UTC day (cron fires in the small hours)", () => {
+    // NOW is 2026-06-02 → the scored day is the just-completed 2026-06-01,
+    // whose workouts + active-energy total are settled.
+    expect(strainDayKey(NOW)).toBe("2026-06-01");
     expect(strainExternalId(NOW)).toBe(
-      `${STRAIN_SCORE_EXTERNAL_ID_PREFIX}2026-06-02`,
+      `${STRAIN_SCORE_EXTERNAL_ID_PREFIX}2026-06-01`,
     );
   });
 
-  it("anchors the canonical timestamp at noon UTC", () => {
+  it("anchors the canonical timestamp at noon UTC on the scored (previous) day", () => {
     expect(strainMeasuredAt(NOW).toISOString()).toBe(
-      "2026-06-02T12:00:00.000Z",
+      "2026-06-01T12:00:00.000Z",
     );
   });
 
@@ -176,7 +178,7 @@ describe("persistStrainScore", () => {
       userId: "user-1",
       type: "STRAIN_SCORE",
       source: "COMPUTED",
-      externalId: "strain:2026-06-02",
+      externalId: "strain:2026-06-01",
     });
     expect(arg.create).toMatchObject({
       type: "STRAIN_SCORE",
diff --git a/src/lib/insights/__tests__/stress-score.test.ts b/src/lib/insights/__tests__/stress-score.test.ts
index 8d8ce2e8b..1427c4723 100644
--- a/src/lib/insights/__tests__/stress-score.test.ts
+++ b/src/lib/insights/__tests__/stress-score.test.ts
@@ -14,6 +14,9 @@ const computeVitalsBaselineMock = vi.fn();
 vi.mock("@/lib/insights/derived/baseline", () => ({
   computeVitalsBaseline: (...args: unknown[]) =>
     computeVitalsBaselineMock(...args),
+  loadBaselineProfile: vi
+    .fn()
+    .mockResolvedValue({ ageYears: null, sex: "MALE", heightCm: 180 }),
 }));
 
 import {
@@ -57,16 +60,18 @@ beforeEach(() => {
 });
 
 describe("stress-score helpers", () => {
-  it("keys the day + externalId by the UTC calendar day", () => {
-    expect(stressDayKey(NOW)).toBe("2026-06-02");
+  it("scores the PREVIOUS UTC day (cron fires in the small hours)", () => {
+    // NOW is 2026-06-02 → the scored day is the just-completed 2026-06-01,
+    // whose intra-day SDNN set is complete rather than a few hours old.
+    expect(stressDayKey(NOW)).toBe("2026-06-01");
     expect(stressExternalId(NOW)).toBe(
-      `${STRESS_SCORE_EXTERNAL_ID_PREFIX}2026-06-02`,
+      `${STRESS_SCORE_EXTERNAL_ID_PREFIX}2026-06-01`,
     );
   });
 
-  it("anchors the canonical timestamp at noon UTC on the scored day", () => {
+  it("anchors the canonical timestamp at noon UTC on the scored (previous) day", () => {
     expect(stressMeasuredAt(NOW).toISOString()).toBe(
-      "2026-06-02T12:00:00.000Z",
+      "2026-06-01T12:00:00.000Z",
     );
   });
 });
@@ -107,13 +112,13 @@ describe("persistStressScore", () => {
       userId: "user-1",
       type: "STRESS_SCORE",
       source: "COMPUTED",
-      externalId: "stress:2026-06-02",
+      externalId: "stress:2026-06-01",
     });
     expect(arg.create).toMatchObject({
       type: "STRESS_SCORE",
       source: "COMPUTED",
       unit: "score",
-      externalId: "stress:2026-06-02",
+      externalId: "stress:2026-06-01",
     });
   });
 
diff --git a/src/lib/insights/derived/baseline.ts b/src/lib/insights/derived/baseline.ts
index 3da330ec4..aa46ba120 100644
--- a/src/lib/insights/derived/baseline.ts
+++ b/src/lib/insights/derived/baseline.ts
@@ -28,8 +28,9 @@
  * statistics helpers below are exported so the unit test can assert the
  * composed-bucket baseline matches the raw-DAY baseline within tolerance.
  */
-import type { MeasurementType } from "@/generated/prisma/client";
+import type { MeasurementType, PrismaClient } from "@/generated/prisma/client";
 import { prisma } from "@/lib/db";
+import { getAgeFromDateOfBirth } from "@/lib/analytics/pulse-targets";
 import {
   probeRollupCoverage,
   type RollupCoverageMap,
@@ -79,6 +80,33 @@ export interface BaselineProfile {
   heightCm?: number | null;
 }
 
+/**
+ * Build the `BaselineProfile` the baseline engine + readiness blend need from
+ * the `User` row. This is the one loader the persisting score engines and the
+ * live `/api/insights/derived` route share — previously each inlined a
+ * byte-identical `findUnique` + gender-narrow + `getAgeFromDateOfBirth`. The
+ * `prisma` arg is the caller's client (the nightly worker passes its shared
+ * connection; the route passes the request client) so both reads hit one
+ * pool. `now` is unused here but accepted so a future age-as-of-date refinement
+ * is a one-line change in this single place.
+ */
+export async function loadBaselineProfile(
+  prisma: PrismaClient,
+  userId: string,
+): Promise<BaselineProfile> {
+  const user = await prisma.user.findUnique({
+    where: { id: userId },
+    select: { dateOfBirth: true, gender: true, heightCm: true },
+  });
+  const sex =
+    user?.gender === "MALE" || user?.gender === "FEMALE" ? user.gender : null;
+  return {
+    ageYears: getAgeFromDateOfBirth(user?.dateOfBirth ?? null),
+    sex,
+    heightCm: user?.heightCm ?? null,
+  };
+}
+
 export interface VitalsBaselineOpts {
   /** Which vital to baseline. */
   type: MeasurementType;
@@ -155,7 +183,7 @@ export function buildBaselineBand(
  * live-SQL fallback on a coverage miss. Returns the series plus the
  * provenance source the read resolved against.
  */
-async function readDayMeanSeries(
+export async function readDayMeanSeries(
   userId: string,
   type: MeasurementType,
   windowDays: number,
diff --git a/src/lib/insights/recovery-score.ts b/src/lib/insights/recovery-score.ts
index aa470df68..40db18a88 100644
--- a/src/lib/insights/recovery-score.ts
+++ b/src/lib/insights/recovery-score.ts
@@ -36,40 +36,43 @@
  * pg-boss job in `src/lib/jobs/recovery-score.ts`.
  */
 import type { PrismaClient } from "@/generated/prisma/client";
-import { getAgeFromDateOfBirth } from "@/lib/analytics/pulse-targets";
 import {
   computeReadiness,
   type ReadinessValue,
 } from "@/lib/insights/derived/readiness";
-import type { BaselineProfile } from "@/lib/insights/derived/baseline";
+import {
+  loadBaselineProfile,
+  type BaselineProfile,
+} from "@/lib/insights/derived/baseline";
+import {
+  scoreDayKey,
+  scoreExternalId,
+  scoreMeasuredAt,
+  upsertScoreRow,
+} from "@/lib/insights/score-row";
 import type { Derived } from "@/lib/insights/derived/types";
 
 /** The per-day idempotency-key prefix for a stored Recovery score row. */
 export const RECOVERY_SCORE_EXTERNAL_ID_PREFIX = "recovery:";
 
 /**
- * The UTC calendar day a `now` falls in, as `YYYY-MM-DD`. The Recovery
- * series is one row per UTC day — the same day-keying the rollup tier and
- * the daily-mean consolidation use, so the score lines up with the buckets
- * it summarises.
+ * The UTC calendar day a Recovery run scores — the PREVIOUS day relative to
+ * `now` (the cron fires in the small hours; the just-completed day is the one
+ * with a full signal set). Delegates to the shared `scoreDayKey` so all three
+ * score engines agree on the day stamp.
  */
 export function recoveryDayKey(now: Date): string {
-  return now.toISOString().slice(0, 10);
+  return scoreDayKey(now);
 }
 
-/** The full `externalId` for a given day's Recovery score row. */
+/** The full `externalId` for a given run's Recovery score row. */
 export function recoveryExternalId(now: Date): string {
-  return `${RECOVERY_SCORE_EXTERNAL_ID_PREFIX}${recoveryDayKey(now)}`;
+  return scoreExternalId(RECOVERY_SCORE_EXTERNAL_ID_PREFIX, now);
 }
 
-/**
- * The canonical timestamp a stored Recovery row carries: noon UTC on the
- * scored day. Noon (not midnight) keeps the row inside its own UTC day under
- * any reasonable display-timezone offset, mirroring the daily-stats
- * convention so a chart never mis-buckets the point at a day boundary.
- */
+/** The canonical timestamp a stored Recovery row carries (noon UTC, scored day). */
 export function recoveryMeasuredAt(now: Date): Date {
-  return new Date(`${recoveryDayKey(now)}T12:00:00.000Z`);
+  return scoreMeasuredAt(now);
 }
 
 export interface RecoveryComputeResult {
@@ -101,25 +104,16 @@ export async function computeRecoveryScore(
 }
 
 /**
- * Build the `BaselineProfile` the readiness blend needs from the user row —
- * the same shape the live `/api/insights/derived` route builds. `prisma` is
- * the (worker) client so the job shares one connection.
+ * Build the `BaselineProfile` the readiness blend needs from the user row.
+ * Thin alias over the shared `loadBaselineProfile` so the existing callers /
+ * tests keep their name; `prisma` is the (worker) client so the job shares one
+ * connection.
  */
 export async function loadRecoveryProfile(
   prisma: PrismaClient,
   userId: string,
 ): Promise<BaselineProfile> {
-  const user = await prisma.user.findUnique({
-    where: { id: userId },
-    select: { dateOfBirth: true, gender: true, heightCm: true },
-  });
-  const sex =
-    user?.gender === "MALE" || user?.gender === "FEMALE" ? user.gender : null;
-  return {
-    ageYears: getAgeFromDateOfBirth(user?.dateOfBirth ?? null),
-    sex,
-    heightCm: user?.heightCm ?? null,
-  };
+  return loadBaselineProfile(prisma, userId);
 }
 
 export interface PersistRecoveryResult {
@@ -147,31 +141,12 @@ export async function persistRecoveryScore(
     return { outcome: "insufficient", score: null };
   }
 
-  const externalId = recoveryExternalId(now);
-  const measuredAt = recoveryMeasuredAt(now);
-
-  await prisma.measurement.upsert({
-    where: {
-      userId_type_source_externalId: {
-        userId,
-        type: "RECOVERY_SCORE",
-        source: "COMPUTED",
-        externalId,
-      },
-    },
-    create: {
-      userId,
-      type: "RECOVERY_SCORE",
-      source: "COMPUTED",
-      value: score,
-      unit: "score",
-      measuredAt,
-      externalId,
-    },
-    update: {
-      value: score,
-      measuredAt,
-    },
+  await upsertScoreRow(prisma, {
+    userId,
+    type: "RECOVERY_SCORE",
+    externalIdPrefix: RECOVERY_SCORE_EXTERNAL_ID_PREFIX,
+    score,
+    now,
   });
 
   return { outcome: "stored", score };
diff --git a/src/lib/insights/score-row.ts b/src/lib/insights/score-row.ts
new file mode 100644
index 000000000..09b6ebce6
--- /dev/null
+++ b/src/lib/insights/score-row.ts
@@ -0,0 +1,149 @@
+/**
+ * v1.10.0 — computed scores (WX-C/E). Shared score-row helpers.
+ *
+ * The three nightly score engines (Recovery / Stress / Strain) all file one
+ * `COMPUTED` Measurement row per user per scored day, keyed by the same
+ * day-stamp triplet (a `prefix:YYYY-MM-DD` externalId, a noon-UTC
+ * `measuredAt`, the UTC day key) and written through the same idempotent
+ * `(userId, type, source, externalId)` upsert. Before this module each engine
+ * carried a byte-identical copy of that triplet + upsert, differing only by
+ * the `prefix` / `type` literal.
+ *
+ * SCORED DAY = THE PREVIOUS UTC DAY. The crons fire ~03:xx UTC (04:45–04:55
+ * Europe/Berlin). At that moment the CURRENT UTC day is only a few hours old:
+ * the Strain engine would miss the just-completed day's workouts and the
+ * Stress engine would see a near-empty intra-day SDNN set and gate as
+ * `insufficient`. Every engine therefore scores the day that just ENDED —
+ * `now − 1 day` — resolved once, here, so the externalId / measuredAt / day
+ * key can never drift between the three.
+ *
+ * `scoreDayKey` / `scoreMeasuredAt` / `scoreExternalId` are pure (no Prisma)
+ * so the engines' day-stamp tests can drive them directly; `upsertScoreRow`
+ * takes the (worker) client.
+ */
+import type { MeasurementType, PrismaClient } from "@/generated/prisma/client";
+import { annotate } from "@/lib/logging/context";
+
+const MS_PER_DAY = 24 * 60 * 60 * 1000;
+
+/**
+ * The UTC calendar day a score run scores — the PREVIOUS day relative to
+ * `now`. The cron runs in the small hours; the just-completed day is the one
+ * with a full set of signals, so we resolve `now − 1 day` and take its UTC
+ * `YYYY-MM-DD`. Resolved in ONE place so all three engines agree.
+ */
+export function scoreDayKey(now: Date): string {
+  return new Date(now.getTime() - MS_PER_DAY).toISOString().slice(0, 10);
+}
+
+/**
+ * The canonical timestamp a stored score row carries: noon UTC on the scored
+ * (previous) day. Noon (not midnight) keeps the row inside its own UTC day
+ * under any reasonable display-timezone offset, mirroring the daily-stats
+ * convention so a chart never mis-buckets the point at a day boundary.
+ */
+export function scoreMeasuredAt(now: Date): Date {
+  return new Date(`${scoreDayKey(now)}T12:00:00.000Z`);
+}
+
+/**
+ * The full per-day idempotency-key `externalId` for a score row:
+ * `prefix:YYYY-MM-DD` over the scored (previous) day. `prefix` carries its
+ * own trailing colon (`recovery:` / `stress:` / `strain:`).
+ */
+export function scoreExternalId(prefix: string, now: Date): string {
+  return `${prefix}${scoreDayKey(now)}`;
+}
+
+/**
+ * Upsert one user's score row for the scored day. Idempotent on the
+ * `(userId, type, source = COMPUTED, externalId)` key so a re-fired cron tick
+ * (or a manual re-run) overwrites the day's row in place rather than minting a
+ * duplicate. The three engines differ only by `type` + `externalId` prefix;
+ * everything else (source, unit, the noon-UTC `measuredAt`) is shared.
+ */
+export async function upsertScoreRow(
+  prisma: PrismaClient,
+  args: {
+    userId: string;
+    type: MeasurementType;
+    externalIdPrefix: string;
+    score: number;
+    now: Date;
+  },
+): Promise<void> {
+  const externalId = scoreExternalId(args.externalIdPrefix, args.now);
+  const measuredAt = scoreMeasuredAt(args.now);
+
+  await prisma.measurement.upsert({
+    where: {
+      userId_type_source_externalId: {
+        userId: args.userId,
+        type: args.type,
+        source: "COMPUTED",
+        externalId,
+      },
+    },
+    create: {
+      userId: args.userId,
+      type: args.type,
+      source: "COMPUTED",
+      value: args.score,
+      unit: "score",
+      measuredAt,
+      externalId,
+    },
+    update: {
+      value: args.score,
+      measuredAt,
+    },
+  });
+}
+
+/** The tally every score pass returns. */
+export interface ScoreBatchResult {
+  considered: number;
+  stored: number;
+  insufficient: number;
+  errored: number;
+}
+
+/**
+ * Run one score pass over a candidate cohort. Each user is scored
+ * independently through `persistFn`; a single user's error is recorded and
+ * the pass continues (one bad account never blocks the cohort). Emits the
+ * pass tally under `actionName`. This is the identical loop the three nightly
+ * jobs each carried — only the persist function + the annotate action name
+ * differed.
+ */
+export async function runScoreBatch(
+  userIds: string[],
+  now: Date,
+  persistFn: (
+    userId: string,
+    now: Date,
+  ) => Promise<{ outcome: "stored" | "insufficient" }>,
+  actionName: string,
+): Promise<ScoreBatchResult> {
+  let stored = 0;
+  let insufficient = 0;
+  let errored = 0;
+  for (const userId of userIds) {
+    try {
+      const result = await persistFn(userId, now);
+      if (result.outcome === "stored") stored += 1;
+      else insufficient += 1;
+    } catch {
+      errored += 1;
+    }
+  }
+
+  annotate({
+    action: {
+      name: actionName,
+      details: { considered: userIds.length, stored, insufficient, errored },
+    },
+  });
+
+  return { considered: userIds.length, stored, insufficient, errored };
+}
diff --git a/src/lib/insights/strain-score.ts b/src/lib/insights/strain-score.ts
index f572a2540..3bc69f476 100644
--- a/src/lib/insights/strain-score.ts
+++ b/src/lib/insights/strain-score.ts
@@ -47,7 +47,13 @@
  * from the nightly pg-boss job in `src/lib/jobs/strain-score.ts`.
  */
 import type { MeasurementType, PrismaClient } from "@/generated/prisma/client";
-import { getAgeFromDateOfBirth } from "@/lib/analytics/pulse-targets";
+import { loadBaselineProfile } from "@/lib/insights/derived/baseline";
+import {
+  scoreDayKey,
+  scoreExternalId,
+  scoreMeasuredAt,
+  upsertScoreRow,
+} from "@/lib/insights/score-row";
 
 /** The per-day idempotency-key prefix for a stored Strain score row. */
 export const STRAIN_SCORE_EXTERNAL_ID_PREFIX = "strain:";
@@ -70,19 +76,25 @@ export const STRAIN_TRIMP_REFERENCE = 150;
  */
 export const STRAIN_ACTIVE_ENERGY_REFERENCE = 600;
 
-/** The UTC calendar day a `now` falls in, as `YYYY-MM-DD`. */
+/**
+ * The UTC calendar day a Strain run scores — the PREVIOUS day relative to
+ * `now`. The cron fires in the small hours; scoring the just-ended day is what
+ * lets the engine see that day's completed workouts + active-energy total
+ * rather than a few hours of the current day. Delegates to the shared
+ * `scoreDayKey` so all three engines agree.
+ */
 export function strainDayKey(now: Date): string {
-  return now.toISOString().slice(0, 10);
+  return scoreDayKey(now);
 }
 
-/** The full `externalId` for a given day's Strain score row. */
+/** The full `externalId` for a given run's Strain score row. */
 export function strainExternalId(now: Date): string {
-  return `${STRAIN_SCORE_EXTERNAL_ID_PREFIX}${strainDayKey(now)}`;
+  return scoreExternalId(STRAIN_SCORE_EXTERNAL_ID_PREFIX, now);
 }
 
-/** Noon UTC on the scored day — same convention as the other scores. */
+/** Noon UTC on the scored (previous) day — same convention as the other scores. */
 export function strainMeasuredAt(now: Date): Date {
-  return new Date(`${strainDayKey(now)}T12:00:00.000Z`);
+  return scoreMeasuredAt(now);
 }
 
 /** Tanaka 2001 age-predicted maximum heart rate. */
@@ -274,15 +286,13 @@ export async function loadStrainInputs(
   userId: string,
   now: Date,
 ): Promise<{ profile: StrainProfile; hrRest: number | null }> {
-  const user = await prisma.user.findUnique({
-    where: { id: userId },
-    select: { dateOfBirth: true, gender: true },
-  });
-  const sex =
-    user?.gender === "MALE" || user?.gender === "FEMALE" ? user.gender : null;
+  // Reuse the shared profile loader, then narrow to the Strain profile
+  // (age + sex; height is not a TRIMP input). One loader for all three
+  // engines + the derived route.
+  const base = await loadBaselineProfile(prisma, userId);
   const profile: StrainProfile = {
-    ageYears: getAgeFromDateOfBirth(user?.dateOfBirth ?? null),
-    sex,
+    ageYears: base.ageYears,
+    sex: base.sex,
   };
 
   // Most recent resting-HR reading within a 30-day window — the HRrest input
@@ -330,31 +340,12 @@ export async function persistStrainScore(
     return { outcome: "insufficient", score: null, reason };
   }
 
-  const externalId = strainExternalId(now);
-  const measuredAt = strainMeasuredAt(now);
-
-  await prisma.measurement.upsert({
-    where: {
-      userId_type_source_externalId: {
-        userId,
-        type: "STRAIN_SCORE",
-        source: "COMPUTED",
-        externalId,
-      },
-    },
-    create: {
-      userId,
-      type: "STRAIN_SCORE",
-      source: "COMPUTED",
-      value: score,
-      unit: "score",
-      measuredAt,
-      externalId,
-    },
-    update: {
-      value: score,
-      measuredAt,
-    },
+  await upsertScoreRow(prisma, {
+    userId,
+    type: "STRAIN_SCORE",
+    externalIdPrefix: STRAIN_SCORE_EXTERNAL_ID_PREFIX,
+    score,
+    now,
   });
 
   return { outcome: "stored", score, reason };
diff --git a/src/lib/insights/stress-score.ts b/src/lib/insights/stress-score.ts
index 46eecc18d..471371608 100644
--- a/src/lib/insights/stress-score.ts
+++ b/src/lib/insights/stress-score.ts
@@ -48,10 +48,18 @@
  * `src/lib/jobs/stress-score.ts`.
  */
 import type { MeasurementType, PrismaClient } from "@/generated/prisma/client";
-import { getAgeFromDateOfBirth } from "@/lib/analytics/pulse-targets";
-import { computeVitalsBaseline } from "@/lib/insights/derived/baseline";
+import {
+  computeVitalsBaseline,
+  loadBaselineProfile,
+} from "@/lib/insights/derived/baseline";
 import { scoreDeviation } from "@/lib/insights/derived/readiness";
 import type { BaselineProfile } from "@/lib/insights/derived/baseline";
+import {
+  scoreDayKey,
+  scoreExternalId,
+  scoreMeasuredAt,
+  upsertScoreRow,
+} from "@/lib/insights/score-row";
 
 /** The per-day idempotency-key prefix for a stored Stress score row. */
 export const STRESS_SCORE_EXTERNAL_ID_PREFIX = "stress:";
@@ -68,23 +76,24 @@ export const STRESS_MIN_INTRADAY_SAMPLES = 3;
 
 const MS_PER_DAY = 24 * 60 * 60 * 1000;
 
-/** The UTC calendar day a `now` falls in, as `YYYY-MM-DD`. */
-export function stressDayKey(now: Date): string {
-  return now.toISOString().slice(0, 10);
-}
-
-/** The full `externalId` for a given day's Stress score row. */
-export function stressExternalId(now: Date): string {
-  return `${STRESS_SCORE_EXTERNAL_ID_PREFIX}${stressDayKey(now)}`;
-}
-
 /**
- * The canonical timestamp a stored Stress row carries: noon UTC on the
- * scored day — same day-keying convention as the Recovery score so the
- * series lines up with the buckets it summarises.
+ * The UTC calendar day a Stress run scores — the PREVIOUS day relative to
+ * `now`. The cron fires in the small hours; scoring the just-ended day is what
+ * gives the intra-day SDNN set a full day of samples instead of a near-empty
+ * few hours. Delegates to the shared `scoreDayKey` so all three engines agree.
  */
+export function stressDayKey(now: Date): string {
+  return scoreDayKey(now);
+}
+
+/** The full `externalId` for a given run's Stress score row. */
+export function stressExternalId(now: Date): string {
+  return scoreExternalId(STRESS_SCORE_EXTERNAL_ID_PREFIX, now);
+}
+
+/** The canonical timestamp a stored Stress row carries (noon UTC, scored day). */
 export function stressMeasuredAt(now: Date): Date {
-  return new Date(`${stressDayKey(now)}T12:00:00.000Z`);
+  return scoreMeasuredAt(now);
 }
 
 /**
@@ -198,24 +207,15 @@ export async function computeStressScore(
 }
 
 /**
- * Build the `BaselineProfile` the SDNN baseline needs from the user row —
- * the same shape the live `/api/insights/derived` route builds.
+ * Build the `BaselineProfile` the SDNN baseline needs from the user row. Thin
+ * alias over the shared `loadBaselineProfile` so callers / tests keep the
+ * name.
  */
 export async function loadStressProfile(
   prisma: PrismaClient,
   userId: string,
 ): Promise<BaselineProfile> {
-  const user = await prisma.user.findUnique({
-    where: { id: userId },
-    select: { dateOfBirth: true, gender: true, heightCm: true },
-  });
-  const sex =
-    user?.gender === "MALE" || user?.gender === "FEMALE" ? user.gender : null;
-  return {
-    ageYears: getAgeFromDateOfBirth(user?.dateOfBirth ?? null),
-    sex,
-    heightCm: user?.heightCm ?? null,
-  };
+  return loadBaselineProfile(prisma, userId);
 }
 
 export interface PersistStressResult {
@@ -252,31 +252,12 @@ export async function persistStressScore(
     return { outcome: "insufficient", score: null, reason };
   }
 
-  const externalId = stressExternalId(now);
-  const measuredAt = stressMeasuredAt(now);
-
-  await prisma.measurement.upsert({
-    where: {
-      userId_type_source_externalId: {
-        userId,
-        type: "STRESS_SCORE",
-        source: "COMPUTED",
-        externalId,
-      },
-    },
-    create: {
-      userId,
-      type: "STRESS_SCORE",
-      source: "COMPUTED",
-      value: score,
-      unit: "score",
-      measuredAt,
-      externalId,
-    },
-    update: {
-      value: score,
-      measuredAt,
-    },
+  await upsertScoreRow(prisma, {
+    userId,
+    type: "STRESS_SCORE",
+    externalIdPrefix: STRESS_SCORE_EXTERNAL_ID_PREFIX,
+    score,
+    now,
   });
 
   return { outcome: "stored", score, reason };
diff --git a/src/lib/jobs/recovery-score.ts b/src/lib/jobs/recovery-score.ts
index 316d2bec4..08918f274 100644
--- a/src/lib/jobs/recovery-score.ts
+++ b/src/lib/jobs/recovery-score.ts
@@ -21,8 +21,8 @@
  * comment guards against).
  */
 import type { PrismaClient } from "@/generated/prisma/client";
-import { annotate } from "@/lib/logging/context";
 import { persistRecoveryScore } from "@/lib/insights/recovery-score";
+import { runScoreBatch } from "@/lib/insights/score-row";
 
 export const RECOVERY_SCORE_QUEUE = "recovery-score-compute";
 
@@ -101,30 +101,10 @@ export async function runRecoveryScore(
 
   const userIds = await findRecoveryScoreCandidates(prisma, now, cap);
 
-  let stored = 0;
-  let insufficient = 0;
-  let errored = 0;
-  for (const userId of userIds) {
-    try {
-      const result = await persistRecoveryScore(prisma, userId, now);
-      if (result.outcome === "stored") stored += 1;
-      else insufficient += 1;
-    } catch {
-      errored += 1;
-    }
-  }
-
-  annotate({
-    action: {
-      name: "insights.recovery.compute",
-      details: {
-        considered: userIds.length,
-        stored,
-        insufficient,
-        errored,
-      },
-    },
-  });
-
-  return { considered: userIds.length, stored, insufficient, errored };
+  return runScoreBatch(
+    userIds,
+    now,
+    (userId, runNow) => persistRecoveryScore(prisma, userId, runNow),
+    "insights.recovery.compute",
+  );
 }
diff --git a/src/lib/jobs/strain-score.ts b/src/lib/jobs/strain-score.ts
index 364f306c9..4415ffb48 100644
--- a/src/lib/jobs/strain-score.ts
+++ b/src/lib/jobs/strain-score.ts
@@ -18,8 +18,8 @@
  * unregistered queue silently never drains.
  */
 import type { PrismaClient } from "@/generated/prisma/client";
-import { annotate } from "@/lib/logging/context";
 import { persistStrainScore } from "@/lib/insights/strain-score";
+import { runScoreBatch } from "@/lib/insights/score-row";
 
 export const STRAIN_SCORE_QUEUE = "strain-score-compute";
 
@@ -95,25 +95,10 @@ export async function runStrainScore(
 
   const userIds = await findStrainScoreCandidates(prisma, now, cap);
 
-  let stored = 0;
-  let insufficient = 0;
-  let errored = 0;
-  for (const userId of userIds) {
-    try {
-      const result = await persistStrainScore(prisma, userId, now);
-      if (result.outcome === "stored") stored += 1;
-      else insufficient += 1;
-    } catch {
-      errored += 1;
-    }
-  }
-
-  annotate({
-    action: {
-      name: "insights.strain.compute",
-      details: { considered: userIds.length, stored, insufficient, errored },
-    },
-  });
-
-  return { considered: userIds.length, stored, insufficient, errored };
+  return runScoreBatch(
+    userIds,
+    now,
+    (userId, runNow) => persistStrainScore(prisma, userId, runNow),
+    "insights.strain.compute",
+  );
 }
diff --git a/src/lib/jobs/stress-score.ts b/src/lib/jobs/stress-score.ts
index 9f7accffb..2064a9ddc 100644
--- a/src/lib/jobs/stress-score.ts
+++ b/src/lib/jobs/stress-score.ts
@@ -19,8 +19,8 @@
  * unregistered queue silently never drains.
  */
 import type { PrismaClient } from "@/generated/prisma/client";
-import { annotate } from "@/lib/logging/context";
 import { persistStressScore } from "@/lib/insights/stress-score";
+import { runScoreBatch } from "@/lib/insights/score-row";
 
 export const STRESS_SCORE_QUEUE = "stress-score-compute";
 
@@ -85,25 +85,10 @@ export async function runStressScore(
 
   const userIds = await findStressScoreCandidates(prisma, now, cap);
 
-  let stored = 0;
-  let insufficient = 0;
-  let errored = 0;
-  for (const userId of userIds) {
-    try {
-      const result = await persistStressScore(prisma, userId, now);
-      if (result.outcome === "stored") stored += 1;
-      else insufficient += 1;
-    } catch {
-      errored += 1;
-    }
-  }
-
-  annotate({
-    action: {
-      name: "insights.stress.compute",
-      details: { considered: userIds.length, stored, insufficient, errored },
-    },
-  });
-
-  return { considered: userIds.length, stored, insufficient, errored };
+  return runScoreBatch(
+    userIds,
+    now,
+    (userId, runNow) => persistStressScore(prisma, userId, runNow),
+    "insights.stress.compute",
+  );
 }