diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 479a40268..f8c36f55f 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -4825,7 +4825,10 @@ paths:
       tags:
         - Measurements
       summary: Delete a measurement
-      description: Soft-deletes the row (tombstone) so paired clients can reconcile the deletion.
+      description: "Soft-deletes the row (tombstone) so paired clients can reconcile the deletion. A blood-pressure systolic
+        or diastolic takes the rest of its reading with it: the other half and the pulse with the same source and the
+        identical `measuredAt`, tombstoned in the same transaction with the same `deletedAt`, each with its own
+        `syncVersion` bump. A pulse is deleted on its own."
       parameters:
         - in: path
           name: id
@@ -4936,7 +4939,8 @@ paths:
       description: Soft-deletes (tombstones) up to 200 of the caller's measurement rows in one call, mirroring the
         single-DELETE contract. Idempotent via the `Idempotency-Key` header; rate-limited
         `measurements:bulk-delete:<userId>`. Forged / foreign / already-deleted ids are silently skipped — `deleted` is
-        the count of rows actually tombstoned. The deletions surface in `/api/sync/changes` as tombstones.
+        the count of rows actually tombstoned, which includes the rest of any blood-pressure reading a selected systolic
+        or diastolic belongs to (as on the single DELETE). The deletions surface in `/api/sync/changes` as tombstones.
       parameters:
         - *a6
       requestBody:
@@ -4965,7 +4969,10 @@ paths:
       description: Un-tombstones up to 200 of the caller's soft-deleted measurement rows in one call — the delete-Undo
         counterpart to `/api/measurements/bulk-delete`. Idempotent via the `Idempotency-Key` header; rate-limited
         `measurements:restore:<userId>`. Forged / foreign / not-deleted ids are silently skipped — `restored` is the
-        count of rows actually un-tombstoned. The restored rows re-surface in `/api/sync/changes` as upserts.
+        count of rows actually un-tombstoned. A blood-pressure systolic or diastolic also restores the rows of its
+        reading that were deleted with it (same source, identical `measuredAt` and `deletedAt`), so naming one half
+        undoes the whole reading; a row deleted at another moment stays deleted. The restored rows re-surface in
+        `/api/sync/changes` as upserts.
       parameters:
         - *a6
       requestBody:
diff --git a/docs/codex-protocol-spec.md b/docs/codex-protocol-spec.md
index de74b0198..67b45d4bb 100644
--- a/docs/codex-protocol-spec.md
+++ b/docs/codex-protocol-spec.md
@@ -631,10 +631,10 @@ Confirmed-rejected slugs (despite the source-tree references in the table above)
 Confirmed-accepted slugs on a ChatGPT Plus subscription (per `available_in_plans` in `models.json`):
 
 - `gpt-5.6-terra` — HealthLog's default (first chain entry) as of 2026-10-24; the backend rejected `gpt-5.5` and everything below it that day. `gpt-5.6-luna` and `gpt-5.6-sol` are its siblings on the same line
-- `gpt-6-sol`, `gpt-6.1-sol`, `gpt-6-luna`, `gpt-6-astra` — the gpt-6 line, listed in `models.json` since 2026-09-22 (`gpt-6.1-sol` the catalog default since 2026-09-29). The catalog names `gpt-6-sol` as the upgrade of `gpt-5.6-terra` and `gpt-5.6-sol`, and `gpt-6-luna` as that of `gpt-5.6-luna`. Every gpt-6 slug lists `input_modalities: ["text", "image"]` and the same reasoning presets as the gpt-5.6 line (`low` to `max`, sol and astra also `ultra`). The presets omit `none`, as they do for `gpt-5.5`, which a live probe on 2026-10-06 showed accepts it; HealthLog sends `none` for "off" on the gpt-6 line too and learns a refusal per slug. The gpt-6 slugs were not probed against a live backend when they joined the chain
-- `gpt-5.5` — the default from 2026-06 until 2026-10-24
-- `gpt-5.4` / `gpt-5.4-mini` / `gpt-5.2` — accepted per plan
-- `gpt-5.3-codex` — was the default (verified 2026-05-09); the backend rotated off the `-codex` line on 2026-06-02 and this slug is now only accepted intermittently, so it sits on a late chain rung
+- `gpt-6-sol`, `gpt-6.1-sol`, `gpt-6-luna`, `gpt-6-astra` — the gpt-6 line, listed in `models.json` since 2026-09-22 (`gpt-6.1-sol` the catalog default since 2026-09-29). The catalog names `gpt-6-sol` as the upgrade of `gpt-5.6-terra` and `gpt-5.6-sol`, and `gpt-6-luna` as that of `gpt-5.6-luna`. Every gpt-6 slug lists `input_modalities: ["text", "image"]` and the same reasoning presets as the gpt-5.6 line (`low` to `max`, sol and astra also `ultra`). The presets omit `none`, as they do for `gpt-5.5`, which a live probe on 2026-10-06 showed accepts it; HealthLog sends `none` for "off" on the gpt-6 line too and learns a refusal per slug. A live check on 2026-10-24 found the account's own list (`GET /backend-api/codex/models?client_version=…`) offering `gpt-6.1-sol`, `gpt-6-astra`, `gpt-6-sol`, `gpt-6-luna` and the `gpt-5.6` line, all with `input_modalities: ["text", "image"]`. From a HealthLog container with its stored sign-in, `gpt-6.1-sol`, `gpt-6-sol` and `gpt-6-luna` each answered text and read a lab-report image correctly. `gpt-6.1-sol` refuses `reasoning.effort: "none"` and names `low` as its lowest effort, which the client learns and steps up to on the same slug; the other two accept `none`
+- `gpt-5.5` — the default from 2026-06 until 2026-10-24, kept as the last chain rung while plans differ
+
+Retired for ChatGPT sign-in (OpenAI's Codex models page): `gpt-5.2` and `gpt-5.3-codex` on 2026-05-26, `gpt-5.4` and `gpt-5.4-mini` on 2026-08-31, `gpt-5.5` on 2026-10-14 at 19:00 UTC. The backend answers each of them with 400 `model_not_found`, "The '<slug>' model is not supported when using Codex with a ChatGPT account.", which the client reads as a reason to try the next slug.
 
 The `codex-rs/tui/src/model_migration.rs` references to `gpt-5-codex` etc. are _migration prompts_ shown to existing users — they are NOT the slugs sent on the wire after migration. The wire slugs come from `models.json`. Always cross-check `models.json` (`gh api repos/openai/codex/contents/codex-rs/models-manager/models.json`) before picking a default.
 
@@ -662,6 +662,8 @@ Every default rung must be a model family the reasoning, sampling and vision gat
 
 The shipped constant in `src/lib/ai/codex-slug-chain.ts` is authoritative; when the upstream rotates again, that file moves first and this listing follows.
 
+A fixed chain goes stale. From 2026-10-14, when GPT-5.5 retired, every model on the chain HealthLog shipped then was retired, and every Codex request answered 503 "all configured Codex slugs were rejected" until the chain was updated or `CODEX_MODEL` was set by hand. Reading the account's live list (`GET /backend-api/codex/models`, as the Codex CLI does) would avoid this.
+
 The chain is overridable via the env var `CODEX_MODEL_FALLBACK_CHAIN` (comma-separated). The first env-var-named slug supersedes `CODEX_MODEL`; if both are set, `CODEX_MODEL` is folded into position 0 and de-duplicated.
 
 **Trigger condition** (when to walk to the next slug):
diff --git a/src/__tests__/labs-module-ai-gate-guard.test.ts b/src/__tests__/labs-module-ai-gate-guard.test.ts
index d798e69ef..70ca38c36 100644
--- a/src/__tests__/labs-module-ai-gate-guard.test.ts
+++ b/src/__tests__/labs-module-ai-gate-guard.test.ts
@@ -65,6 +65,8 @@ const NOT_MODEL_INPUT: Record<string, string> = {
     "links stored rows to their biomarker; no model is involved",
   "src/lib/jobs/lab-biomarker-backfill.ts#enqueueBootTimeLabBiomarkerBackfill":
     "finds the accounts whose rows need linking; no model is involved",
+  "src/lib/jobs/lab-document-date-repair.ts#candidateQuery":
+    "finds document lab values filed at their confirmation moment to re-date them; no model is involved",
   "src/lib/jobs/soft-delete-retention.ts#SOFT_DELETE_RETENTION":
     "purges rows past the trash window; no model is involved",
   "src/lib/insights/correlation-channel-series.ts#fetchLabDraws":
diff --git a/src/app/api/documents/inbound/[id]/confirm/route.ts b/src/app/api/documents/inbound/[id]/confirm/route.ts
index 564af8e62..919398228 100644
--- a/src/app/api/documents/inbound/[id]/confirm/route.ts
+++ b/src/app/api/documents/inbound/[id]/confirm/route.ts
@@ -43,7 +43,8 @@ async function confirmDocument(
 
   const document = await prisma.inboundDocument.findFirst({
     where: { id, userId: user.id, deletedAt: null },
-    select: { id: true },
+    // The two dates date a value that states none of its own.
+    select: { id: true, reportDate: true, documentDate: true },
   });
   if (!document) {
     return apiError("Document not found", 404, {
@@ -94,10 +95,15 @@ async function confirmDocument(
     try {
       // v1.43 — an OBSERVATION may name the marker the person chose
       // on the review screen; the label is then remembered as its alias.
-      const ref = await commitApprovedFact(user.id, fact, {
-        biomarkerId: decision.biomarkerId,
-        rememberAlias: decision.rememberAlias,
-      });
+      const ref = await commitApprovedFact(
+        user.id,
+        fact,
+        {
+          biomarkerId: decision.biomarkerId,
+          rememberAlias: decision.rememberAlias,
+        },
+        document,
+      );
       await prisma.extractedFact.update({
         where: { id: fact.id },
         data: {
diff --git a/src/app/api/measurements/[id]/route.ts b/src/app/api/measurements/[id]/route.ts
index 84e18c624..be24ec3a2 100644
--- a/src/app/api/measurements/[id]/route.ts
+++ b/src/app/api/measurements/[id]/route.ts
@@ -23,6 +23,7 @@ import {
 } from "@/lib/measurements/apple-health-mirror";
 import { invalidateUserMeasurements } from "@/lib/cache/invalidate";
 import { afterMeasurementMutation } from "@/lib/rollups/after-measurement-mutation";
+import { bloodPressureSiblings } from "@/lib/measurements/blood-pressure-reading";
 import { Prisma, type MeasurementType } from "@/generated/prisma/client";
 import { NextRequest } from "next/server";
 import { z } from "zod";
@@ -237,18 +238,45 @@ export const DELETE = apiHandler(
     // (see `measurements/route.ts:100`), so the row is invisible to
     // normal reads from this point on. A row that is already tombstoned
     // re-bumps `syncVersion` harmlessly (idempotent re-delete).
-    await prisma.measurement.update({
-      where: { id },
-      data: {
-        deletedAt: new Date(),
-        syncVersion: { increment: 1 },
-      },
+    //
+    // A systolic or diastolic takes the rest of its reading with it (the
+    // other half and the cuff's pulse, `bloodPressureSiblings`), in the same
+    // transaction and with the same `deletedAt`, which is how the restore
+    // route knows to bring them back together. Each sibling bumps its own
+    // `syncVersion`, so a paired client sees every row's tombstone.
+    const deletedAt = new Date();
+    const siblings = await prisma.$transaction(async (tx) => {
+      const found = await bloodPressureSiblings(
+        tx,
+        user.id,
+        [existing],
+        "live",
+      );
+      await tx.measurement.update({
+        where: { id },
+        data: { deletedAt, syncVersion: { increment: 1 } },
+      });
+      if (found.length > 0) {
+        await tx.measurement.updateMany({
+          where: {
+            id: { in: found.map((s) => s.id) },
+            userId: user.id,
+            deletedAt: null,
+          },
+          data: { deletedAt, syncVersion: { increment: 1 } },
+        });
+      }
+      return found;
     });
 
     await auditLog("measurement.delete", {
       userId: user.id,
       ipAddress: getClientIp(request),
-      details: { measurementId: id, type: existing.type },
+      details: {
+        measurementId: id,
+        type: existing.type,
+        readingRows: siblings.length,
+      },
     });
 
     annotate({
@@ -269,7 +297,10 @@ export const DELETE = apiHandler(
     // the rollup row when the day's measurement count goes to zero).
     await afterMeasurementMutation(
       user.id,
-      [{ type: existing.type, measuredAt: existing.measuredAt }],
+      [
+        { type: existing.type, measuredAt: existing.measuredAt },
+        ...siblings.map((s) => ({ type: s.type, measuredAt: s.measuredAt })),
+      ],
       { source: "manual" },
     );
 
diff --git a/src/app/api/measurements/bulk-delete/__tests__/route.test.ts b/src/app/api/measurements/bulk-delete/__tests__/route.test.ts
index b41d53ccb..f546f195d 100644
--- a/src/app/api/measurements/bulk-delete/__tests__/route.test.ts
+++ b/src/app/api/measurements/bulk-delete/__tests__/route.test.ts
@@ -10,15 +10,19 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { NextRequest } from "next/server";
 
-vi.mock("@/lib/db", () => ({
-  prisma: {
+vi.mock("@/lib/db", () => {
+  const prisma = {
     measurement: {
       findMany: vi.fn(),
       updateMany: vi.fn(),
     },
     auditLog: { create: vi.fn() },
-  },
-}));
+    // The read and the write run in one transaction; the stub hands the
+    // callback the same mocked client.
+    $transaction: vi.fn(async (fn: (tx: unknown) => unknown) => fn(prisma)),
+  };
+  return { prisma };
+});
 
 vi.mock("@/lib/auth/session", () => ({ getSession: vi.fn() }));
 vi.mock("@/lib/auth/audit", () => ({
@@ -113,8 +117,16 @@ describe("POST /api/measurements/bulk-delete", () => {
   it("soft-deletes only owned, non-tombstoned rows and returns that count", async () => {
     // Caller asked for 3 ids but only 2 are owned + live.
     vi.mocked(prisma.measurement.findMany).mockResolvedValue([
-      { type: "WEIGHT", measuredAt: new Date("2026-01-01T08:00:00Z") },
-      { type: "WEIGHT", measuredAt: new Date("2026-01-01T20:00:00Z") },
+      {
+        id: "m1",
+        type: "WEIGHT",
+        measuredAt: new Date("2026-01-01T08:00:00Z"),
+      },
+      {
+        id: "m2",
+        type: "WEIGHT",
+        measuredAt: new Date("2026-01-01T20:00:00Z"),
+      },
     ] as never);
     vi.mocked(prisma.measurement.updateMany).mockResolvedValue({
       count: 2,
@@ -129,7 +141,9 @@ describe("POST /api/measurements/bulk-delete", () => {
     // never 404s, it's just excluded from the count.
     const call = vi.mocked(prisma.measurement.updateMany).mock.calls[0][0];
     expect(call.where).toMatchObject({
-      id: { in: ["m1", "m2", "foreign"] },
+      // The write names the rows the scoped read found, never the
+      // forged id the caller sent.
+      id: { in: ["m1", "m2"] },
       userId: "user-1",
       deletedAt: null,
     });
diff --git a/src/app/api/measurements/bulk-delete/route.ts b/src/app/api/measurements/bulk-delete/route.ts
index 03ea9abc3..16e2a22ee 100644
--- a/src/app/api/measurements/bulk-delete/route.ts
+++ b/src/app/api/measurements/bulk-delete/route.ts
@@ -7,6 +7,8 @@
  *
  * Soft-deletes (tombstones) every owned, not-already-deleted row in one
  * `updateMany` — matching the single-DELETE iOS tombstone contract. A
+ * selected blood-pressure half takes the rest of its reading with it, as the
+ * single DELETE does, and `deleted` counts every row tombstoned. A
  * forged / foreign id is a silent no-op (never a 404 existence leak): the
  * mutation `where` pins `userId` so it only ever touches the caller's rows.
  *
@@ -26,6 +28,7 @@ import { withIdempotency } from "@/lib/idempotency";
 import { checkRateLimit } from "@/lib/rate-limit";
 import { invalidateUserMeasurements } from "@/lib/cache/invalidate";
 import { afterMeasurementMutation } from "@/lib/rollups/after-measurement-mutation";
+import { bloodPressureSiblings } from "@/lib/measurements/blood-pressure-reading";
 import type { MeasurementType } from "@/generated/prisma/client";
 
 const MAX_IDS_PER_BATCH = 200;
@@ -73,17 +76,27 @@ async function postBulkDelete(request: NextRequest): Promise<Response> {
   // a status-insight cache drop. Ownership-scoped + `deletedAt: null` so
   // a forged / foreign / already-tombstoned id is excluded here exactly
   // as it is from the mutation below — no existence leak.
-  const affected = await prisma.measurement.findMany({
-    where: { id: { in: ids }, userId: user.id, deletedAt: null },
-    select: { type: true, measuredAt: true },
-  });
+  //
+  // A selected systolic or diastolic brings the rest of its reading (the
+  // other half and the cuff's pulse, `bloodPressureSiblings`) into the same
+  // statement, so the shared `deletedAt` lets the restore route bring the
+  // reading back whole.
+  const { affected, count } = await prisma.$transaction(async (tx) => {
+    const selected = await tx.measurement.findMany({
+      where: { id: { in: ids }, userId: user.id, deletedAt: null },
+      select: { id: true, type: true, source: true, measuredAt: true },
+    });
+    const siblings = await bloodPressureSiblings(tx, user.id, selected, "live");
+    const rowIds = [...selected, ...siblings].map((row) => row.id);
 
-  // Soft-delete (tombstone) in one statement. The `where` pins `userId`
-  // so a forged id for another user is silently a no-op; `deletedAt: null`
-  // keeps the count honest (an already-tombstoned id doesn't re-count).
-  const { count } = await prisma.measurement.updateMany({
-    where: { id: { in: ids }, userId: user.id, deletedAt: null },
-    data: { deletedAt: now, syncVersion: { increment: 1 } },
+    // Soft-delete (tombstone) in one statement. The `where` pins `userId`
+    // so a forged id for another user is silently a no-op; `deletedAt: null`
+    // keeps the count honest (an already-tombstoned id doesn't re-count).
+    const { count } = await tx.measurement.updateMany({
+      where: { id: { in: rowIds }, userId: user.id, deletedAt: null },
+      data: { deletedAt: now, syncVersion: { increment: 1 } },
+    });
+    return { affected: [...selected, ...siblings], count };
   });
 
   await auditLog("measurement.delete.bulk", {
diff --git a/src/app/api/measurements/restore/__tests__/route.test.ts b/src/app/api/measurements/restore/__tests__/route.test.ts
index 0fa7e8427..73ce2540e 100644
--- a/src/app/api/measurements/restore/__tests__/route.test.ts
+++ b/src/app/api/measurements/restore/__tests__/route.test.ts
@@ -10,15 +10,19 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { NextRequest } from "next/server";
 
-vi.mock("@/lib/db", () => ({
-  prisma: {
+vi.mock("@/lib/db", () => {
+  const prisma = {
     measurement: {
       findMany: vi.fn(),
       updateMany: vi.fn(),
     },
     auditLog: { create: vi.fn() },
-  },
-}));
+    // The read and the write run in one transaction; the stub hands the
+    // callback the same mocked client.
+    $transaction: vi.fn(async (fn: (tx: unknown) => unknown) => fn(prisma)),
+  };
+  return { prisma };
+});
 
 vi.mock("@/lib/auth/session", () => ({ getSession: vi.fn() }));
 vi.mock("@/lib/auth/audit", () => ({
@@ -110,8 +114,16 @@ describe("POST /api/measurements/restore", () => {
   it("un-tombstones only owned, tombstoned rows and returns that count", async () => {
     // Caller asked for 3 ids but only 2 are owned + tombstoned.
     vi.mocked(prisma.measurement.findMany).mockResolvedValue([
-      { type: "WEIGHT", measuredAt: new Date("2026-01-01T08:00:00Z") },
-      { type: "WEIGHT", measuredAt: new Date("2026-01-01T20:00:00Z") },
+      {
+        id: "m1",
+        type: "WEIGHT",
+        measuredAt: new Date("2026-01-01T08:00:00Z"),
+      },
+      {
+        id: "m2",
+        type: "WEIGHT",
+        measuredAt: new Date("2026-01-01T20:00:00Z"),
+      },
     ] as never);
     vi.mocked(prisma.measurement.updateMany).mockResolvedValue({
       count: 2,
@@ -126,7 +138,9 @@ describe("POST /api/measurements/restore", () => {
     // forged / live id never 404s, it's just excluded from the count.
     const call = vi.mocked(prisma.measurement.updateMany).mock.calls[0][0];
     expect(call.where).toMatchObject({
-      id: { in: ["m1", "m2", "foreign"] },
+      // The write names the rows the scoped read found, never the
+      // forged id the caller sent.
+      id: { in: ["m1", "m2"] },
       userId: "user-1",
       deletedAt: { not: null },
     });
diff --git a/src/app/api/measurements/restore/route.ts b/src/app/api/measurements/restore/route.ts
index 3c2a7b92d..62aeab9a7 100644
--- a/src/app/api/measurements/restore/route.ts
+++ b/src/app/api/measurements/restore/route.ts
@@ -28,6 +28,7 @@ import { withIdempotency } from "@/lib/idempotency";
 import { checkRateLimit } from "@/lib/rate-limit";
 import { invalidateUserMeasurements } from "@/lib/cache/invalidate";
 import { afterMeasurementMutation } from "@/lib/rollups/after-measurement-mutation";
+import { bloodPressureSiblings } from "@/lib/measurements/blood-pressure-reading";
 import type { MeasurementType } from "@/generated/prisma/client";
 
 const MAX_IDS_PER_BATCH = 200;
@@ -73,17 +74,39 @@ async function postRestore(request: NextRequest): Promise<Response> {
   // a status-insight cache drop. Ownership-scoped + `deletedAt != null`
   // so a forged / foreign / never-deleted id is excluded here exactly as
   // it is from the mutation below — no existence leak.
-  const affected = await prisma.measurement.findMany({
-    where: { id: { in: ids }, userId: user.id, deletedAt: { not: null } },
-    select: { type: true, measuredAt: true },
-  });
+  //
+  // A blood-pressure half brings back the rows of its reading that were
+  // tombstoned in the same statement (identical `deletedAt`,
+  // `bloodPressureSiblings`), so an undo that names only the row the person
+  // tapped restores the reading the delete took. A row deleted on its own,
+  // at another moment, stays deleted.
+  const { affected, count } = await prisma.$transaction(async (tx) => {
+    const selected = await tx.measurement.findMany({
+      where: { id: { in: ids }, userId: user.id, deletedAt: { not: null } },
+      select: {
+        id: true,
+        type: true,
+        source: true,
+        measuredAt: true,
+        deletedAt: true,
+      },
+    });
+    const siblings = await bloodPressureSiblings(
+      tx,
+      user.id,
+      selected,
+      "deletedWith",
+    );
+    const rowIds = [...selected, ...siblings].map((row) => row.id);
 
-  // Un-tombstone in one statement. The `where` pins `userId` so a forged
-  // id for another user is silently a no-op; `deletedAt: { not: null }`
-  // keeps the count honest (a live row doesn't re-count).
-  const { count } = await prisma.measurement.updateMany({
-    where: { id: { in: ids }, userId: user.id, deletedAt: { not: null } },
-    data: { deletedAt: null, syncVersion: { increment: 1 } },
+    // Un-tombstone in one statement. The `where` pins `userId` so a forged
+    // id for another user is silently a no-op; `deletedAt: { not: null }`
+    // keeps the count honest (a live row doesn't re-count).
+    const { count } = await tx.measurement.updateMany({
+      where: { id: { in: rowIds }, userId: user.id, deletedAt: { not: null } },
+      data: { deletedAt: null, syncVersion: { increment: 1 } },
+    });
+    return { affected: [...selected, ...siblings], count };
   });
 
   await auditLog("measurement.restore", {
diff --git a/src/lib/ai/__tests__/codex-reasoning.test.ts b/src/lib/ai/__tests__/codex-reasoning.test.ts
index ac022be44..a4609130e 100644
--- a/src/lib/ai/__tests__/codex-reasoning.test.ts
+++ b/src/lib/ai/__tests__/codex-reasoning.test.ts
@@ -137,6 +137,49 @@ describe("Codex reasoning request", () => {
     expect(body.include).toEqual([]);
     expect(result.reasoning?.downgradedTo).toBeUndefined();
   });
+
+  it("on a slug that refuses none, steps up to its lowest effort and stays on the slug", async () => {
+    // gpt-6.1-sol, a rung on the default list, refuses "none" (seen 2026-10-24).
+    // That refusal is about the effort, not the model: no walk to the next slug.
+    const refusal = JSON.stringify({
+      error: {
+        message:
+          "Unsupported value: 'none' is not supported with the 'gpt-6.1-sol' model. Supported values are: 'low', 'medium', 'high', 'xhigh', and 'max'.",
+        type: "invalid_request_error",
+        param: "reasoning.effort",
+        code: "unsupported_value",
+      },
+    });
+    const mock = vi
+      .fn()
+      .mockResolvedValueOnce(errorResponse(400, refusal))
+      .mockImplementation(async () =>
+        sseResponse(fixture("codex-after-tool.sse")),
+      );
+    vi.stubGlobal("fetch", mock);
+    const c = new CodexClient({
+      accessToken: "test-token",
+      accountId: "acct-test",
+      onTokenRefresh: vi
+        .fn()
+        .mockResolvedValue({ accessToken: "x", accountId: "acct-test" }),
+      slugChain: ["gpt-6.1-sol", "gpt-6-sol"],
+    });
+
+    await c.generateCompletion(
+      params({ reasoning: { effort: "off", summaries: false } }),
+    );
+    expect(sentBody(mock, 0).reasoning).toEqual({ effort: "none" });
+    expect(sentBody(mock, 1).model).toBe("gpt-6.1-sol");
+    expect(sentBody(mock, 1).reasoning).toEqual({ effort: "low" });
+
+    await c.generateCompletion(
+      params({ reasoning: { effort: "off", summaries: false } }),
+    );
+    expect(mock).toHaveBeenCalledTimes(3);
+    expect(sentBody(mock, 2).model).toBe("gpt-6.1-sol");
+    expect(sentBody(mock, 2).reasoning).toEqual({ effort: "low" });
+  });
 });
 
 describe("Codex reasoning stream", () => {
diff --git a/src/lib/ai/__tests__/codex-slug-fallback.test.ts b/src/lib/ai/__tests__/codex-slug-fallback.test.ts
index 860cbfd39..6ac75d8a3 100644
--- a/src/lib/ai/__tests__/codex-slug-fallback.test.ts
+++ b/src/lib/ai/__tests__/codex-slug-fallback.test.ts
@@ -91,6 +91,48 @@ describe("Codex slug fallback chain", () => {
     clearCodexSlugCache();
   });
 
+  it("an account without the head of the default list walks on to the next rung", async () => {
+    const origModel = process.env.CODEX_MODEL;
+    const origChain = process.env.CODEX_MODEL_FALLBACK_CHAIN;
+    delete process.env.CODEX_MODEL;
+    delete process.env.CODEX_MODEL_FALLBACK_CHAIN;
+    try {
+      // The exact refusal a ChatGPT sign-in gets for a retired model.
+      const mockFetch = vi
+        .fn()
+        .mockResolvedValueOnce(
+          rejectionResponse(
+            400,
+            '{"detail":"The \'gpt-5.6-terra\' model is not supported when using Codex with a ChatGPT account.","error":{"type":"invalid_request_error","code":"model_not_found"}}',
+          ),
+        )
+        .mockResolvedValueOnce(sseSuccessResponse());
+      vi.stubGlobal("fetch", mockFetch);
+
+      const client = new CodexClient({
+        accessToken: "test",
+        accountId: "acct",
+        onTokenRefresh,
+      });
+      await client.generateCompletion(
+        singleUserTurn({ system: "s", user: "u" }),
+      );
+
+      expect(client.getLastDiagnostics()?.attempted).toEqual([
+        "gpt-5.6-terra",
+        "gpt-6-sol",
+      ]);
+      expect(client.getLastDiagnostics()?.workingSlug).toBe("gpt-6-sol");
+      expect(getCachedCodexSlug()).toBe("gpt-6-sol");
+    } finally {
+      if (origModel === undefined) delete process.env.CODEX_MODEL;
+      else process.env.CODEX_MODEL = origModel;
+      if (origChain === undefined)
+        delete process.env.CODEX_MODEL_FALLBACK_CHAIN;
+      else process.env.CODEX_MODEL_FALLBACK_CHAIN = origChain;
+    }
+  });
+
   it("first slug succeeds — uses head-of-chain and caches it", async () => {
     const mockFetch = vi.fn().mockResolvedValue(sseSuccessResponse());
     vi.stubGlobal("fetch", mockFetch);
@@ -340,6 +382,14 @@ describe("Codex slug fallback chain", () => {
     ).toBe(true);
     expect(helper(400, '{"error":{"code":"model_not_found"}}')).toBe(true);
     expect(helper(400, "model gpt-5 does not exist")).toBe(true);
+    // The refusal a ChatGPT sign-in got for gpt-5.5 after its retirement
+    // (seen 2026-10-24).
+    expect(
+      helper(
+        400,
+        '{"detail":"The \'gpt-5.5\' model is not supported when using Codex with a ChatGPT account.","error":{"type":"invalid_request_error","code":"model_not_found"}}',
+      ),
+    ).toBe(true);
     expect(helper(404, "anything")).toBe(true);
     expect(helper(500, "internal error")).toBe(false);
     expect(helper(429, "rate limited")).toBe(false);
@@ -360,6 +410,17 @@ describe("Codex slug fallback chain", () => {
       "gpt-5.6-sol",
       "gpt-5.5",
     ]);
+    // OpenAI retired these from Codex for ChatGPT sign-in: 5.2 and 5.3-Codex
+    // on 2026-05-26, 5.4 and 5.4 mini on 2026-08-31. A retired rung costs
+    // every account that reaches it a refused request.
+    for (const retired of [
+      "gpt-5.4",
+      "gpt-5.4-mini",
+      "gpt-5.3-codex",
+      "gpt-5.2",
+    ]) {
+      expect(__test.DEFAULT_SLUG_FALLBACK_CHAIN).not.toContain(retired);
+    }
   });
 
   it("DEFAULT_SLUG_FALLBACK_CHAIN holds only slugs every family gate recognises", () => {
diff --git a/src/lib/ai/__tests__/gateway-unswitchable-reasoning.test.ts b/src/lib/ai/__tests__/gateway-unswitchable-reasoning.test.ts
index 8e415bd80..329363eab 100644
--- a/src/lib/ai/__tests__/gateway-unswitchable-reasoning.test.ts
+++ b/src/lib/ai/__tests__/gateway-unswitchable-reasoning.test.ts
@@ -45,16 +45,22 @@ interface SeenRequest {
  * `always`: the thought fills the ceiling whatever the effort (gpt-oss, GLM).
  * `answers-unreasoned`: the same, except asked with `none` it answers
  * (Gemma 4 on Ollama).
+ * `answers-with-room`: ignores the effort and answers once the ceiling leaves
+ * it the `high` thinking room (GLM 5.3 behind a gateway, #1276).
  */
-let mode: "always" | "answers-unreasoned" = "always";
+let mode: "always" | "answers-unreasoned" | "answers-with-room" = "always";
 let server: http.Server;
 let origin: string;
 let seen: SeenRequest[] = [];
 
 const ANSWER = JSON.stringify({ summary: "Steady." });
 
-function reply(effort: unknown) {
-  const answers = mode === "answers-unreasoned" && effort === "none";
+function reply(effort: unknown, maxTokens: unknown) {
+  const answers =
+    (mode === "answers-unreasoned" && effort === "none") ||
+    (mode === "answers-with-room" &&
+      typeof maxTokens === "number" &&
+      maxTokens >= 12_000);
   return {
     id: "chatcmpl-1279",
     object: "chat.completion",
@@ -87,7 +93,14 @@ beforeAll(async () => {
         maxTokens: body.max_tokens ?? body.max_completion_tokens,
       });
       res.writeHead(200, { "Content-Type": "application/json" });
-      res.end(JSON.stringify(reply(body.reasoning_effort)));
+      res.end(
+        JSON.stringify(
+          reply(
+            body.reasoning_effort,
+            body.max_tokens ?? body.max_completion_tokens,
+          ),
+        ),
+      );
     });
   });
   await new Promise<void>((r) => server.listen(0, "127.0.0.1", r));
@@ -210,3 +223,77 @@ describe.each([
     });
   },
 );
+
+/** A daily briefing call as the chain runner hands it to a client. */
+function briefingParams(unattended: boolean): CompletionParams {
+  return {
+    ...singleUserTurn({
+      system: "You write the daily briefing.",
+      user: "Snapshot: …",
+      maxTokens: 300,
+      timeoutMs: 30_000,
+      responseFormat: "json",
+    }),
+    reasoning: { effort: "medium", summaries: false },
+    ...(unattended ? { unattended: true } : {}),
+  };
+}
+
+describe.each([
+  ["the OpenAI-compatible gateway", gateway],
+  ["the Local client", local],
+] as const)(
+  "#1276 — %s, background work for a model that cannot be switched down",
+  (_, make) => {
+    it("gives the #1267 repeat the High room, and answers on the first call", async () => {
+      mode = "answers-with-room";
+      const result = await make().generateCompletion(briefingParams(true));
+
+      expect(result.content).toBe(ANSWER);
+      // Two requests, the call's budget: medium at its own room, then the
+      // repeat with `none` and the High room the reply showed it needs.
+      expect(seen).toEqual([
+        { reasoningEffort: "medium", maxTokens: 4396 },
+        { reasoningEffort: "none", maxTokens: 12_300 },
+      ]);
+      // Every later background call starts with the High room.
+      seen = [];
+      await make().generateCompletion(briefingParams(true));
+      expect(seen).toEqual([{ reasoningEffort: "none", maxTokens: 12_300 }]);
+    });
+
+    it("gives a status card, which asks no level, the same room", async () => {
+      mode = "answers-with-room";
+      const result = await make().generateCompletion({
+        ...statusParams(),
+        unattended: true,
+      });
+      expect(result.content).toBe(ANSWER);
+      expect(seen.map((s) => s.maxTokens)).toEqual([300, 12_300]);
+    });
+
+    it("keeps the High room once even `none` is learned useless, and stays at one request", async () => {
+      const err = (await make()
+        .generateCompletion(briefingParams(true))
+        .catch((e) => e)) as Record<string, unknown>;
+      expect(err.kind).toBe("reasoning_only");
+      expect(seen.map((s) => s.maxTokens)).toEqual([4396, 12_300]);
+      seen = [];
+      await make()
+        .generateCompletion(briefingParams(true))
+        .catch(() => {});
+      expect(seen).toEqual([{ reasoningEffort: "medium", maxTokens: 12_300 }]);
+    });
+
+    it("leaves a call a person is reading at the room of its level", async () => {
+      await make()
+        .generateCompletion(briefingParams(false))
+        .catch(() => {});
+      seen = [];
+      await make()
+        .generateCompletion(briefingParams(false))
+        .catch(() => {});
+      expect(seen).toEqual([{ reasoningEffort: "medium", maxTokens: 4396 }]);
+    });
+  },
+);
diff --git a/src/lib/ai/__tests__/provider-runner-background-bench.test.ts b/src/lib/ai/__tests__/provider-runner-background-bench.test.ts
index e17e9c558..c7efb8110 100644
--- a/src/lib/ai/__tests__/provider-runner-background-bench.test.ts
+++ b/src/lib/ai/__tests__/provider-runner-background-bench.test.ts
@@ -272,3 +272,29 @@ describe("#1279: background work and a benched provider", () => {
     expect((err as AllProvidersFailedError).tokensSpent).toBe(5400);
   });
 });
+
+describe("#1276 — the runner marks background calls", () => {
+  class Recorder implements AIProvider {
+    readonly type = "openai-compatible" as const;
+    seen: CompletionParams[] = [];
+    async generateCompletion(p: CompletionParams): Promise<CompletionResult> {
+      this.seen.push(p);
+      return { content: "{}", tokensUsed: 1 } as CompletionResult;
+    }
+  }
+
+  it.each([
+    ["job", true],
+    ["coach", undefined],
+  ] as const)("a %s walk carries unattended: %s", async (surface, expected) => {
+    const instance = new Recorder();
+    await walk(
+      surface,
+      `u-unattended-${surface}`,
+      "openai-compatible",
+      instance,
+      createInMemoryProviderHealthLedger(),
+    );
+    expect(instance.seen[0]?.unattended).toBe(expected);
+  });
+});
diff --git a/src/lib/ai/local-client.ts b/src/lib/ai/local-client.ts
index 6af86a14c..4fbe52d6b 100644
--- a/src/lib/ai/local-client.ts
+++ b/src/lib/ai/local-client.ts
@@ -27,11 +27,10 @@ import {
   noteReasoningSeen,
   refusesReasoningField,
 } from "./reasoning/dialect-cache";
-import { uncontrolledThinkingRoom } from "./reasoning/levels";
 import {
   askAgainUnreasoned,
   knownReasoner,
-  reasonsUnasked,
+  uncontrolledCallThinkingRoom,
   repeatUnreasoned,
 } from "./reasoning/answerless";
 import {
@@ -149,11 +148,10 @@ export class LocalOpenAICompatibleClient implements AIProvider {
     // `none` sent for Off or after the #1267 lesson must not leave it the
     // bare answer budget to think in. A call without a level gets the `low`
     // room once the model has shown it reasons unasked.
-    const thinkingTokens = params.reasoning
-      ? uncontrolledThinkingRoom(params.reasoning.effort)
-      : reasonsUnasked(this.reasoningDialectKey())
-        ? uncontrolledThinkingRoom("off")
-        : 0;
+    const thinkingTokens = uncontrolledCallThinkingRoom(
+      this.reasoningDialectKey(),
+      params,
+    );
     const body = JSON.stringify({
       model: this.config.model,
       messages,
diff --git a/src/lib/ai/openai-client.ts b/src/lib/ai/openai-client.ts
index feb6efd5c..1e144ac2c 100644
--- a/src/lib/ai/openai-client.ts
+++ b/src/lib/ai/openai-client.ts
@@ -21,15 +21,12 @@ import {
 import {
   askAgainUnreasoned,
   knownReasoner,
-  reasonsUnasked,
+  uncontrolledCallThinkingRoom,
   repeatUnreasoned,
 } from "./reasoning/answerless";
 import { RequestHops } from "./request-hops";
 import { learnFromRefusal } from "./wire-refusal";
-import {
-  REASONING_THINKING_BUDGET,
-  uncontrolledThinkingRoom,
-} from "./reasoning/levels";
+import { REASONING_THINKING_BUDGET } from "./reasoning/levels";
 import {
   answerOf,
   isOpenRouterEndpoint,
@@ -573,19 +570,15 @@ export class OpenAIClient implements AIProvider {
    * included, and a `none` sent for the person's Off or after the #1267
    * lesson must not leave it the bare answer budget to think in. Without a
    * level of its own, a call gets the `low` room once the model has shown it
-   * reasons unasked.
+   * reasons unasked, and background work the `high` room once the model has
+   * answered with reasoning alone (`unattendedThinkingRoom`).
    */
   private thinkingRoom(
     params: CompletionParams,
     wire: OpenAIReasoningWire,
   ): number {
     if (this.isGateway) {
-      if (params.reasoning) {
-        return uncontrolledThinkingRoom(params.reasoning.effort);
-      }
-      return reasonsUnasked(this.reasoningDialectKey())
-        ? uncontrolledThinkingRoom("off")
-        : 0;
+      return uncontrolledCallThinkingRoom(this.reasoningDialectKey(), params);
     }
     if (wire.kind === "none" || wire.effort === "none") return 0;
     const level = levelOfWireEffort(wire.effort);
diff --git a/src/lib/ai/provider-runner.ts b/src/lib/ai/provider-runner.ts
index 684853b5c..2aafb360d 100644
--- a/src/lib/ai/provider-runner.ts
+++ b/src/lib/ai/provider-runner.ts
@@ -743,14 +743,17 @@ export async function runStreamingRawCompletionWithFallback(
     onDelta: (delta: string) => void;
   },
 ): Promise<RunRawWithFallbackResult> {
+  // #1276 — a job walk is background work; stamped here, not per call site.
+  const params: CompletionParams =
+    args.surface === "job" ? { ...args.params, unattended: true } : args.params;
   return runRawChain(
     args,
     // Prefer the provider's streaming wire; fall back to the buffered call for
     // providers (cloud clients today) that do not implement streaming.
     (candidate) =>
       candidate.instance.generateCompletionStream
-        ? candidate.instance.generateCompletionStream(args.params, args.onDelta)
-        : candidate.instance.generateCompletion(args.params),
+        ? candidate.instance.generateCompletionStream(params, args.onDelta)
+        : candidate.instance.generateCompletion(params),
     (candidate) => ({
       ai_chain_streamed: Boolean(candidate.instance.generateCompletionStream),
     }),
@@ -789,7 +792,9 @@ export interface RunRawWithFallbackResult {
 export async function runRawCompletionWithFallback(
   args: ChainWalkArgs,
 ): Promise<RunRawWithFallbackResult> {
+  const params: CompletionParams =
+    args.surface === "job" ? { ...args.params, unattended: true } : args.params;
   return runRawChain(args, (candidate) =>
-    candidate.instance.generateCompletion(args.params),
+    candidate.instance.generateCompletion(params),
   );
 }
diff --git a/src/lib/ai/reasoning/answerless.ts b/src/lib/ai/reasoning/answerless.ts
index bcf2a2e18..492a94e3f 100644
--- a/src/lib/ai/reasoning/answerless.ts
+++ b/src/lib/ai/reasoning/answerless.ts
@@ -36,6 +36,11 @@ import {
   rememberReasoningDialect,
   type ReasoningDialectKey,
 } from "./dialect-cache";
+import {
+  REASONING_THINKING_BUDGET,
+  uncontrolledThinkingRoom,
+  type ReasoningLevel,
+} from "./levels";
 
 /**
  * What the client does next with an answerless reply.
@@ -137,6 +142,49 @@ export function reasonsUnasked(key: ReasoningDialectKey): boolean {
   );
 }
 
+/**
+ * #1276 — the thinking room of an unattended call (`CompletionParams.unattended`)
+ * to a model that has answered with reasoning alone (`reasonsUnasked`): at
+ * least the `high` room the Coach gets on High. Background work asks for
+ * `medium` at most, and a model that cannot be switched down (GLM behind
+ * vLLM) spends all of it thinking and answers nothing, the daily briefing's
+ * `reasoning_only`. The room applies from the #1267 repeat with `none` on:
+ * one call may send two requests (`request-hops.ts`), and a once-a-day job
+ * meets an expired lesson every morning, so the room has to ride on the
+ * repeat or the first job of the day never gets it. A ceiling, not a charge:
+ * a model that does stop at `none` never touches it, one that does not
+ * thinks as long as it does either way and reaches the answer. Every call a
+ * person is reading keeps `room`.
+ */
+export function unattendedThinkingRoom(
+  key: ReasoningDialectKey,
+  room: number,
+  unattended: boolean | undefined,
+): number {
+  return unattended && reasonsUnasked(key)
+    ? Math.max(room, REASONING_THINKING_BUDGET.high)
+    : room;
+}
+
+/**
+ * #1276 — the thinking room of one call on a wire whose reasoning switch the
+ * client cannot verify (a gateway, a local server): by the call's level, not
+ * by what the wire says, the `low` room for a call without a level once the
+ * model has shown it reasons unasked, and the `high` room for background work
+ * once it has answered with reasoning alone (`unattendedThinkingRoom`).
+ */
+export function uncontrolledCallThinkingRoom(
+  key: ReasoningDialectKey,
+  params: { reasoning?: { effort: ReasoningLevel }; unattended?: boolean },
+): number {
+  const room = params.reasoning
+    ? uncontrolledThinkingRoom(params.reasoning.effort)
+    : reasonsUnasked(key)
+      ? uncontrolledThinkingRoom("off")
+      : 0;
+  return unattendedThinkingRoom(key, room, params.unattended);
+}
+
 /**
  * #1276 — true when the model has shown it reasons, for a request that did
  * (`asked`) or did not ask it to: a lesson that says it reasons unasked, or a
diff --git a/src/lib/ai/types.ts b/src/lib/ai/types.ts
index 4dcbdc1bf..f4a78a27a 100644
--- a/src/lib/ai/types.ts
+++ b/src/lib/ai/types.ts
@@ -383,6 +383,14 @@ export interface CompletionParams {
    * client sends exactly what it sent before the field existed.
    */
   reasoning?: { effort: ReasoningLevel; summaries: boolean };
+  /**
+   * #1276 — no person reads this reply as it streams: the call runs as
+   * background work. Set by the chain runner for every `"job"` walk, never by
+   * a call site. The gateway and local clients give such a call the `high`
+   * thinking room once its model has answered with reasoning alone
+   * (`unattendedThinkingRoom`); nothing else reads it.
+   */
+  unattended?: boolean;
   /**
    * v1.41.2 — a stable key for calls that resend the same prompt prefix (the
    * rounds of one Coach turn, the turns of one conversation). Providers that
diff --git a/src/lib/documents/__tests__/commit.test.ts b/src/lib/documents/__tests__/commit.test.ts
index 591ebae47..81deb22dd 100644
--- a/src/lib/documents/__tests__/commit.test.ts
+++ b/src/lib/documents/__tests__/commit.test.ts
@@ -12,6 +12,7 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 vi.mock("@/lib/db", () => ({
   prisma: {
     labResult: { create: vi.fn() },
+    illnessEpisode: { create: vi.fn() },
   },
 }));
 
@@ -27,8 +28,16 @@ import { commitApprovedFact, FactCommitError } from "@/lib/documents/commit";
 import { prisma } from "@/lib/db";
 import { resolveOrMintBiomarker } from "@/lib/labs/biomarker-store";
 import { decryptFactData } from "@/lib/documents/store";
-import type { ExtractedFact } from "@/generated/prisma/client";
+import type {
+  ExtractedFact,
+  IllnessEpisode,
+  LabResult,
+} from "@/generated/prisma/client";
 import { userDayKey } from "@/lib/tz/format";
+import type {
+  ConditionFactData,
+  ObservationFactData,
+} from "@/lib/validations/inbound-documents";
 
 function observationFact(): ExtractedFact {
   return {
@@ -213,3 +222,181 @@ describe("commitApprovedFact — OBSERVATION unit integrity", () => {
     ).resolves.toEqual({ recordType: "labResult", recordId: "lr-2" });
   });
 });
+
+describe("commitApprovedFact — OBSERVATION date when the value states none", () => {
+  // A lab report that prints the collection date once in its header carries
+  // no date beside each value. Mutation check: drop the document day from
+  // `takenAt` → the report-date, filing-date and impossible-date cases file
+  // the reading under today.
+  function undated(effectiveDate: string | null = null) {
+    const data: ObservationFactData = {
+      label: "Ferritin",
+      code: null,
+      codeSystem: null,
+      value: 80,
+      valueText: null,
+      unit: "ng/mL",
+      referenceLow: null,
+      referenceHigh: null,
+      effectiveDate,
+    };
+    vi.mocked(decryptFactData).mockReturnValue(data);
+    vi.mocked(resolveOrMintBiomarker).mockResolvedValue({
+      id: "bm-3",
+      name: "Ferritin",
+      unit: "ng/mL",
+      lowerBound: null,
+      upperBound: null,
+      panel: null,
+      analyteKey: null,
+    });
+    vi.mocked(prisma.labResult.create).mockResolvedValue({
+      id: "lr-3",
+    } as LabResult);
+  }
+
+  /** The dates as the confirm route reads them off the stored document. */
+  function dates(reportDate: string | null, documentDate: string | null) {
+    return {
+      // An older report date sits at UTC midnight, newer ones at noon UTC.
+      reportDate: reportDate ? new Date(`${reportDate}T00:00:00.000Z`) : null,
+      documentDate: documentDate
+        ? new Date(`${documentDate}T12:00:00.000Z`)
+        : null,
+    };
+  }
+
+  function storedTakenAt(): Date {
+    return vi.mocked(prisma.labResult.create).mock.calls[0]![0].data
+      .takenAt as Date;
+  }
+
+  it("keeps the value's own date", async () => {
+    undated("2021-03-04");
+
+    await commitApprovedFact(
+      "user-1",
+      observationFact(),
+      {},
+      dates("2021-03-01", "2026-10-20"),
+    );
+
+    expect(storedTakenAt().toISOString()).toBe("2021-03-04T12:00:00.000Z");
+  });
+
+  it("takes the report date the document states over its filing date", async () => {
+    undated();
+
+    await commitApprovedFact(
+      "user-1",
+      observationFact(),
+      {},
+      dates("2021-03-01", "2026-10-20"),
+    );
+
+    expect(storedTakenAt().toISOString()).toBe("2021-03-01T12:00:00.000Z");
+  });
+
+  it("takes the filing date when the document states no report date", async () => {
+    undated();
+
+    await commitApprovedFact(
+      "user-1",
+      observationFact(),
+      {},
+      dates(null, "2021-02-15"),
+    );
+
+    expect(storedTakenAt().toISOString()).toBe("2021-02-15T12:00:00.000Z");
+  });
+
+  it.each([
+    ["not a date", "March 2021"],
+    ["a day the month does not have", "2021-02-30"],
+    ["a month that does not exist", "2021-13-01"],
+  ])(
+    "reads a value whose own date is %s as undated",
+    async (_label, effectiveDate) => {
+      undated(effectiveDate);
+
+      await commitApprovedFact(
+        "user-1",
+        observationFact(),
+        {},
+        dates("2021-03-01", null),
+      );
+
+      // Not 2 March for 30 February, and no Invalid Date for month 13.
+      expect(storedTakenAt().toISOString()).toBe("2021-03-01T12:00:00.000Z");
+    },
+  );
+
+  it("files the reading under now when neither the value nor the document has a date", async () => {
+    undated();
+
+    const before = Date.now();
+    await commitApprovedFact(
+      "user-1",
+      observationFact(),
+      {},
+      dates(null, null),
+    );
+    const after = Date.now();
+
+    const takenAt = storedTakenAt().getTime();
+    expect(takenAt).toBeGreaterThanOrEqual(before);
+    expect(takenAt).toBeLessThanOrEqual(after);
+  });
+});
+
+describe("commitApprovedFact — CONDITION onset", () => {
+  // The onset goes through the same stated-day check as a lab value's date.
+  function condition(onsetDate: string | null) {
+    const data: ConditionFactData = {
+      label: "Iron deficiency",
+      code: null,
+      codeSystem: null,
+      clinicalStatus: null,
+      verificationStatus: null,
+      onsetDate,
+    };
+    vi.mocked(decryptFactData).mockReturnValue(data);
+    vi.mocked(prisma.illnessEpisode.create).mockResolvedValue({
+      id: "ep-1",
+    } as IllnessEpisode);
+  }
+
+  function conditionFact(): ExtractedFact {
+    return {
+      id: "fact-2",
+      factType: "CONDITION",
+      dataEncrypted: new Uint8Array(),
+    } as unknown as ExtractedFact;
+  }
+
+  function storedOnset(): Date {
+    return vi.mocked(prisma.illnessEpisode.create).mock.calls[0]![0].data
+      .onsetAt as Date;
+  }
+
+  it("keeps a stated onset day", async () => {
+    condition("2021-03-04");
+
+    await commitApprovedFact("user-1", conditionFact());
+
+    expect(storedOnset().toISOString()).toBe("2021-03-04T12:00:00.000Z");
+  });
+
+  it("files an onset that is not a real day under now, not an invalid date", async () => {
+    // 2021-13-01 used to become an invalid date that failed the whole confirm.
+    condition("2021-13-01");
+
+    const before = Date.now();
+    await commitApprovedFact("user-1", conditionFact());
+    const after = Date.now();
+
+    const onset = storedOnset().getTime();
+    expect(onset).toBeGreaterThanOrEqual(before);
+    expect(onset).toBeLessThanOrEqual(after);
+  });
+});
diff --git a/src/lib/documents/commit.ts b/src/lib/documents/commit.ts
index db39f3d31..97633752b 100644
--- a/src/lib/documents/commit.ts
+++ b/src/lib/documents/commit.ts
@@ -44,7 +44,11 @@ import type {
   MedicationStatementFactData,
   ObservationFactData,
 } from "@/lib/validations/inbound-documents";
-import { dateOnlyAtNoonUtc, isDateOnlyKey } from "@/lib/tz/date-only";
+import {
+  dateOnlyAtNoonUtc,
+  dateOnlyKey,
+  isCalendarDateKey,
+} from "@/lib/tz/date-only";
 
 /** A per-fact commit failure the caller maps to a per-fact 422 entry. */
 export class FactCommitError extends Error {
@@ -61,14 +65,41 @@ export interface CommittedRecordRef {
   recordId: string;
 }
 
+/** A stated day, or null when it is not a real calendar date. */
+export function statedDay(date: string | null): string | null {
+  return date && isCalendarDateKey(date) ? date : null;
+}
+
 /**
  * A stated YYYY-MM-DD as the instant a date-only value is stored at (noon
- * UTC), or now when the document states none. UTC midnight read back as the
+ * UTC), else the fallback day, else now. UTC midnight read back as the
  * previous day anywhere west of UTC.
  */
-function statedDateOrNow(date: string | null): Date {
-  if (date && isDateOnlyKey(date)) return dateOnlyAtNoonUtc(date);
-  return new Date();
+function statedDateOrNow(
+  date: string | null,
+  fallback: string | null = null,
+): Date {
+  const day = statedDay(date) ?? fallback;
+  return day ? dateOnlyAtNoonUtc(day) : new Date();
+}
+
+/** The two dates a stored document carries, as the confirm route reads them. */
+export interface FactDocumentDates {
+  reportDate: Date | null;
+  documentDate: Date | null;
+}
+
+/**
+ * The day a value from this document took place when it states none of its
+ * own: the report date the model read off the document, else the document's
+ * filing date, the same order the day view and the timeline place a document
+ * by. A lab report that prints the collection date once in its header carries
+ * no date beside each value, and every reading used to be filed under the day
+ * it was confirmed.
+ */
+export function documentDay(dates: FactDocumentDates | null): string | null {
+  const day = dates?.reportDate ?? dates?.documentDate ?? null;
+  return day ? dateOnlyKey(day) : null;
 }
 
 /**
@@ -84,6 +115,7 @@ async function commitObservation(
   userId: string,
   data: ObservationFactData,
   choice: ObservationChoice = {},
+  fallbackDay: string | null = null,
 ): Promise<CommittedRecordRef> {
   const isQualitative = typeof data.value !== "number";
   // A numeric reading needs a unit so the catalog has something to mint with —
@@ -228,7 +260,7 @@ async function commitObservation(
       sourceReferenceLow: storedSourceLow,
       sourceReferenceHigh: storedSourceHigh,
       sourceReferenceText: isQualitative ? null : sourceText,
-      takenAt: statedDateOrNow(data.effectiveDate),
+      takenAt: statedDateOrNow(data.effectiveDate, fallbackDay),
       source: "DOCUMENT",
       noteEncrypted: null,
     },
@@ -317,12 +349,18 @@ export async function commitApprovedFact(
   userId: string,
   fact: ExtractedFact,
   choice: ObservationChoice = {},
+  documentDates: FactDocumentDates | null = null,
 ): Promise<CommittedRecordRef> {
   // Decrypt the staged payload at confirm time to write it into the normal
   // structured store. Fail-closed: a bad key id throws and aborts the commit.
   const data = decryptFactData(fact.dataEncrypted);
   if (fact.factType === "OBSERVATION") {
-    return commitObservation(userId, data as ObservationFactData, choice);
+    return commitObservation(
+      userId,
+      data as ObservationFactData,
+      choice,
+      documentDay(documentDates),
+    );
   }
   if (fact.factType === "CONDITION") {
     return commitCondition(userId, data as ConditionFactData);
diff --git a/src/lib/jobs/__tests__/queue-policy-tables.test.ts b/src/lib/jobs/__tests__/queue-policy-tables.test.ts
index 7a728b6fb..41c5b2f3d 100644
--- a/src/lib/jobs/__tests__/queue-policy-tables.test.ts
+++ b/src/lib/jobs/__tests__/queue-policy-tables.test.ts
@@ -112,6 +112,15 @@ describe("maintenance group queue policies", () => {
     expectPolicy("maintenance", queue, policy);
   });
 
+  // One-shot repairs on a fixed singleton key: a boot during a run must be
+  // able to queue the next pass, so only queued duplicates collapse.
+  it.each([["lab-document-date-repair", "short"]])(
+    "%s is %s",
+    (queue, policy) => {
+      expectPolicy("maintenance", queue, policy);
+    },
+  );
+
   it("environment-fetch is deliberately left on standard", () => {
     // Its explicit-range backfill sends with no key at all, on purpose, so any
     // policy would collapse two different requested date ranges onto the shared
diff --git a/src/lib/jobs/lab-document-date-repair-queue.ts b/src/lib/jobs/lab-document-date-repair-queue.ts
new file mode 100644
index 000000000..34ccea6e6
--- /dev/null
+++ b/src/lib/jobs/lab-document-date-repair-queue.ts
@@ -0,0 +1,10 @@
+/**
+ * The queue facts of `lab-document-date-repair.ts`: its name and its one
+ * singleton key. They live apart from the job so the worker registry and the
+ * boot discovery can read them without loading it.
+ */
+export const LAB_DOCUMENT_DATE_REPAIR_QUEUE = "lab-document-date-repair";
+
+/** One pass covers every account, so there is only ever one job. */
+export const LAB_DOCUMENT_DATE_REPAIR_SINGLETON_KEY =
+  "lab-document-date-repair";
diff --git a/src/lib/jobs/lab-document-date-repair.ts b/src/lib/jobs/lab-document-date-repair.ts
new file mode 100644
index 000000000..57edb24e5
--- /dev/null
+++ b/src/lib/jobs/lab-document-date-repair.ts
@@ -0,0 +1,234 @@
+/**
+ * One-shot repair: lab values confirmed from a document before the confirm
+ * step learned to date an undated value by its document.
+ *
+ * A lab report usually prints the collection date once, in its header. The
+ * extraction stores that date on the document (`reportDate`) and leaves each
+ * value's own date empty, and the confirm step used to file such a value
+ * under the moment it was confirmed. The confirm step now takes the
+ * document's day (`documentDay` in `src/lib/documents/commit.ts`); this pass
+ * moves the values it filed wrongly before, by the same rule.
+ *
+ * A value is moved only when every link in the chain is certain:
+ *   - the lab result was written by the document confirm path
+ *     (`source = 'DOCUMENT'`, which no other writer sets) and is live;
+ *   - exactly one APPROVED observation fact names it as its committed record,
+ *     so the document it came from is known;
+ *   - its `takenAt` still sits within a few seconds of its own `createdAt`,
+ *     which is what a value filed under its confirmation moment looks like
+ *     (both were stamped in the same create). A value the person re-dated
+ *     since, or one that carried its own date, sits elsewhere;
+ *   - the staged fact states no calendar date of its own (decrypted here;
+ *     SQL cannot see it);
+ *   - the document has a report date, else a filing date, and that day is
+ *     not the day the value is filed under in the owner's time zone. A value
+ *     really taken on the day it was confirmed stays where it is.
+ *
+ * The moved value lands at noon UTC on the document's day, the anchor every
+ * date-only lab value uses. Idempotent: a moved value no longer sits at its
+ * creation moment, so a second run finds nothing, and a boot with nothing to
+ * repair costs one query.
+ */
+import type { Job } from "pg-boss";
+
+import { Prisma, type PrismaClient } from "@/generated/prisma/client";
+import { activeAccountSql } from "@/lib/account-deletion/active-account";
+import { invalidateUserHealthScore } from "@/lib/cache/invalidate";
+import { prisma as defaultPrisma } from "@/lib/db";
+import { documentDay, statedDay } from "@/lib/documents/commit";
+import { decryptFactData } from "@/lib/documents/store";
+import { getGlobalBoss } from "@/lib/jobs/boss-instance";
+import { jobDone, jobFailed, type JobOutcome } from "@/lib/jobs/job-outcome";
+import { workerLog } from "@/lib/jobs/reminder/shared";
+import { annotate } from "@/lib/logging/context";
+import { withBackgroundEvent } from "@/lib/logging/background";
+import { dateOnlyAtNoonUtc } from "@/lib/tz/date-only";
+import { userDayKey } from "@/lib/tz/format";
+import { resolveUserTimezone } from "@/lib/tz/resolver";
+import type { ObservationFactData } from "@/lib/validations/inbound-documents";
+
+import {
+  LAB_DOCUMENT_DATE_REPAIR_QUEUE,
+  LAB_DOCUMENT_DATE_REPAIR_SINGLETON_KEY,
+} from "./lab-document-date-repair-queue";
+
+/**
+ * How far `takenAt` may sit from `createdAt` and still count as the moment of
+ * confirmation. The two are stamped a few milliseconds apart in one create; a
+ * few seconds leaves room for a clock step and nothing a person would type.
+ */
+const CONFIRM_MOMENT_TOLERANCE_SECONDS = 5;
+
+interface CandidateRow {
+  id: string;
+  userId: string;
+  takenAt: Date;
+  dataEncrypted: Uint8Array;
+  reportDate: Date | null;
+  documentDate: Date | null;
+}
+
+/**
+ * The SQL half of the rule. `limit` turns it into the boot's existence
+ * check. `.planning/v1.46.2-fragments/lab-repair-count.sql` is the same
+ * predicate as a read-only count.
+ */
+function candidateQuery(limit: number | null): Prisma.Sql {
+  // The day comparison runs here as well as in the repair, so a value that
+  // really was taken on its confirmation day drops out of the boot check and
+  // the pass converges to an empty set. A zone Postgres does not know is read
+  // as UTC rather than failing the query; the repair re-checks every row in
+  // the zone the app resolves.
+  return Prisma.sql`
+    WITH "known_zones" AS (SELECT "name" FROM pg_timezone_names)
+    SELECT r."id",
+           r."user_id"       AS "userId",
+           r."taken_at"      AS "takenAt",
+           f."data_encrypted" AS "dataEncrypted",
+           d."report_date"   AS "reportDate",
+           d."document_date" AS "documentDate"
+    FROM "lab_results" r
+    JOIN "extracted_facts" f
+      ON f."committed_record_id" = r."id"
+     AND f."committed_record_type" = 'labResult'
+     AND f."status" = 'APPROVED'
+     AND f."fact_type" = 'OBSERVATION'
+     AND f."user_id" = r."user_id"
+    JOIN "inbound_documents" d
+      ON d."id" = f."document_id"
+     AND d."user_id" = r."user_id"
+    JOIN "users" u ON u."id" = r."user_id"
+    WHERE r."source" = 'DOCUMENT'
+      AND r."deleted_at" IS NULL
+      AND abs(extract(epoch FROM (r."taken_at" - r."created_at"))) <= ${CONFIRM_MOMENT_TOLERANCE_SECONDS}
+      AND COALESCE(d."report_date", d."document_date") IS NOT NULL
+      AND to_char(COALESCE(d."report_date", d."document_date"), 'YYYY-MM-DD')
+          <> to_char(
+               (r."taken_at" AT TIME ZONE 'UTC') AT TIME ZONE (
+                 CASE WHEN u."timezone" IN (SELECT "name" FROM "known_zones")
+                      THEN u."timezone" ELSE 'UTC' END
+               ),
+               'YYYY-MM-DD'
+             )
+      AND (
+        SELECT count(*) FROM "extracted_facts" other
+        WHERE other."committed_record_id" = r."id"
+          AND other."committed_record_type" = 'labResult'
+      ) = 1
+      AND ${activeAccountSql('r."user_id"')}
+    ORDER BY r."id"
+    ${limit === null ? Prisma.empty : Prisma.sql`LIMIT ${limit}`}
+  `;
+}
+
+export interface LabDocumentDateRepairResult {
+  /** Rows the SQL predicate returned. */
+  scanned: number;
+  /** Rows moved to their document's day. */
+  updated: number;
+  /** Rows left alone: an own date, or already on the document's day. */
+  unchanged: number;
+}
+
+/** The repair itself, across every account. */
+export async function repairUndatedDocumentLabValues(
+  prisma: PrismaClient = defaultPrisma,
+): Promise<LabDocumentDateRepairResult> {
+  const rows = await prisma.$queryRaw<CandidateRow[]>(candidateQuery(null));
+  const touchedUsers = new Set<string>();
+  let updated = 0;
+  let unchanged = 0;
+
+  for (const row of rows) {
+    const data = decryptFactData(row.dataEncrypted) as ObservationFactData;
+    // A value with a date of its own is never touched, whatever its row says.
+    if (statedDay(data.effectiveDate ?? null) !== null) {
+      unchanged += 1;
+      continue;
+    }
+    const day = documentDay({
+      reportDate: row.reportDate,
+      documentDate: row.documentDate,
+    });
+    const tz = await resolveUserTimezone(row.userId);
+    if (!day || userDayKey(row.takenAt, tz) === day) {
+      unchanged += 1;
+      continue;
+    }
+    // Conditional on the value read: a re-date that landed since the read
+    // wins over the repair.
+    const moved = await prisma.labResult.updateMany({
+      where: {
+        id: row.id,
+        userId: row.userId,
+        takenAt: row.takenAt,
+        deletedAt: null,
+      },
+      data: { takenAt: dateOnlyAtNoonUtc(day) },
+    });
+    if (moved.count === 0) {
+      unchanged += 1;
+      continue;
+    }
+    updated += 1;
+    touchedUsers.add(row.userId);
+  }
+
+  for (const userId of touchedUsers) invalidateUserHealthScore(userId);
+  return { scanned: rows.length, updated, unchanged };
+}
+
+/** The queue handler: one run over every account. */
+export async function handleLabDocumentDateRepair(
+  _jobs: Job<Record<string, never>>[],
+  prisma: PrismaClient = defaultPrisma,
+): Promise<JobOutcome> {
+  return withBackgroundEvent("job.lab_document_date_repair", async () => {
+    let result: LabDocumentDateRepairResult;
+    try {
+      result = await repairUndatedDocumentLabValues(prisma);
+    } catch (err) {
+      workerLog("error", "[lab-document-date-repair] failed", err);
+      return jobFailed("lab document date repair failed", err);
+    }
+    workerLog(
+      "info",
+      `[lab-document-date-repair] scanned=${result.scanned} updated=${result.updated} unchanged=${result.unchanged}`,
+    );
+    annotate({
+      action: { name: "labs.documentDate.repair" },
+      meta: { ...result },
+    });
+    return jobDone({
+      candidates_scanned: result.scanned,
+      updated: result.updated,
+      unchanged: result.unchanged,
+    });
+  });
+}
+
+/**
+ * Boot discovery: one existence query, and the one job only when there is
+ * something to repair.
+ */
+export async function enqueueBootTimeLabDocumentDateRepair(
+  prisma: PrismaClient = defaultPrisma,
+): Promise<{ enqueued: boolean; error: string | null }> {
+  const boss = getGlobalBoss();
+  if (!boss) return { enqueued: false, error: null };
+  try {
+    const any = await prisma.$queryRaw<CandidateRow[]>(candidateQuery(1));
+    if (any.length === 0) return { enqueued: false, error: null };
+    const id = await boss.send(
+      LAB_DOCUMENT_DATE_REPAIR_QUEUE,
+      {},
+      { singletonKey: LAB_DOCUMENT_DATE_REPAIR_SINGLETON_KEY, retryLimit: 2 },
+    );
+    return { enqueued: id !== null, error: null };
+  } catch (err) {
+    return {
+      enqueued: false,
+      error: err instanceof Error ? err.message : String(err),
+    };
+  }
+}
diff --git a/src/lib/jobs/queue-runtime.ts b/src/lib/jobs/queue-runtime.ts
index 49fc6d154..7d6a3ae9d 100644
--- a/src/lib/jobs/queue-runtime.ts
+++ b/src/lib/jobs/queue-runtime.ts
@@ -485,6 +485,9 @@ export const QUEUE_RUNTIME: Readonly<Record<string, QueueRuntime>> = {
     },
     why: "One account's folded means, a day at a time; stops at three quarters of the default expiry and sends a follow-up that resumes at the next day.",
   },
+  "lab-document-date-repair": short(
+    "Reads the document lab values still filed at their confirmation moment, a handful per account, and moves each with one update.",
+  ),
   "measurement-maintenance": {
     runtime: "long",
     expireInSeconds: MEASUREMENT_MAINTENANCE_SEND_OPTIONS.expireInSeconds,
diff --git a/src/lib/jobs/registry/maintenance-discovery.ts b/src/lib/jobs/registry/maintenance-discovery.ts
index c0f2c41e2..2de44262a 100644
--- a/src/lib/jobs/registry/maintenance-discovery.ts
+++ b/src/lib/jobs/registry/maintenance-discovery.ts
@@ -77,6 +77,15 @@ export const MAINTENANCE_DISCOVERY: readonly BootDiscovery[] = [
         await import("@/lib/jobs/measurement-fold-repair")
       ).enqueueBootTimeMeasurementFoldRepair(),
   },
+  // Converges to nothing once the misdated values are moved; a boot with
+  // none costs one query.
+  {
+    name: "lab-document-date-repair",
+    run: async () =>
+      (
+        await import("@/lib/jobs/lab-document-date-repair")
+      ).enqueueBootTimeLabDocumentDateRepair(),
+  },
   // Self-limiting and idempotent; a boot with no backlog costs one query.
   {
     name: "compaction-tombstone-purge",
diff --git a/src/lib/jobs/registry/maintenance-repairs.ts b/src/lib/jobs/registry/maintenance-repairs.ts
new file mode 100644
index 000000000..2d3224e86
--- /dev/null
+++ b/src/lib/jobs/registry/maintenance-repairs.ts
@@ -0,0 +1,25 @@
+/**
+ * One-shot data repairs of the maintenance group, kept beside
+ * `maintenance.ts` so that file stays under the size ratchet. Each is sent
+ * by its boot discovery in `maintenance-discovery.ts` only while it has
+ * something to repair.
+ */
+import { LAB_DOCUMENT_DATE_REPAIR_QUEUE } from "@/lib/jobs/lab-document-date-repair-queue";
+
+import { defineJob, type JobDefinition } from "./define-job";
+
+export const MAINTENANCE_REPAIR_JOBS: readonly JobDefinition[] = [
+  // Document lab values filed under their confirmation moment.
+  defineJob({
+    queue: LAB_DOCUMENT_DATE_REPAIR_QUEUE,
+    policy: {
+      policy: "short",
+      reason:
+        "Fixed singleton key; collapse queued duplicates only, so a boot during a run can queue the next one.",
+    },
+    work: { localConcurrency: 1 },
+    load: async () =>
+      (await import("@/lib/jobs/lab-document-date-repair"))
+        .handleLabDocumentDateRepair,
+  }),
+];
diff --git a/src/lib/jobs/registry/maintenance.ts b/src/lib/jobs/registry/maintenance.ts
index 587123022..574d48352 100644
--- a/src/lib/jobs/registry/maintenance.ts
+++ b/src/lib/jobs/registry/maintenance.ts
@@ -202,6 +202,7 @@ import {
 } from "@/lib/medications/intake-slot-dedup";
 
 import { MAINTENANCE_DISCOVERY } from "./maintenance-discovery";
+import { MAINTENANCE_REPAIR_JOBS } from "./maintenance-repairs";
 import {
   defineJob,
   type JobDefinition,
@@ -524,6 +525,7 @@ const jobs: readonly JobDefinition[] = [
       (await import("@/lib/jobs/measurement-fold-repair"))
         .handleMeasurementFoldRepair,
   }),
+  ...MAINTENANCE_REPAIR_JOBS,
   // The nightly check vacuums when dead rows pile up; the same singleton key
   // as the operator's run, so the two collapse.
   defineJob({
diff --git a/src/lib/jobs/subsystem-surface.ts b/src/lib/jobs/subsystem-surface.ts
index ea14eac89..419541cca 100644
--- a/src/lib/jobs/subsystem-surface.ts
+++ b/src/lib/jobs/subsystem-surface.ts
@@ -120,6 +120,7 @@ const subsystemSurface = {
   "health-connect-import": { audience: "account" },
   "compaction-tombstone-purge": { audience: "system" },
   "measurement-fold-repair": { audience: "system" },
+  "lab-document-date-repair": { audience: "system" },
   "measurement-maintenance": { audience: "system" },
   "pulse-day-mean": { audience: "system" },
   "medication-intake-import": { audience: "system" },
diff --git a/src/lib/measurements/blood-pressure-reading.ts b/src/lib/measurements/blood-pressure-reading.ts
new file mode 100644
index 000000000..589a7fb66
--- /dev/null
+++ b/src/lib/measurements/blood-pressure-reading.ts
@@ -0,0 +1,82 @@
+/**
+ * One blood-pressure reading is up to three rows: systolic, diastolic and
+ * the pulse the cuff measured with them. No column links them. What makes
+ * them one reading is how every writer stores it: the entry form, the MCP
+ * write, a Withings measure group and a HealthKit correlation all write the
+ * halves with the same source at the same instant, and the FHIR read pairs a
+ * diastolic onto its systolic by exactly that instant.
+ *
+ * So the rule here is the strict one: same owner, same source, identical
+ * `measuredAt`. The series and in-target reads pair more loosely (nearest
+ * diastolic within five minutes) because they only draw a point; a delete
+ * takes rows away, so it takes only the rows that can be nothing else.
+ *
+ * Deleting a systolic or a diastolic takes the whole reading with it.
+ * Deleting a pulse takes only the pulse: a pulse is also a value of its own,
+ * and removing one is no reason to remove a blood pressure.
+ */
+import type { MeasurementType, Prisma } from "@/generated/prisma/client";
+
+/** The types that anchor a reading: deleting one deletes the reading. */
+const BP_HALVES: ReadonlySet<string> = new Set([
+  "BLOOD_PRESSURE_SYS",
+  "BLOOD_PRESSURE_DIA",
+]);
+
+/** Every type a reading's rows can carry. */
+const BP_READING_TYPES: MeasurementType[] = [
+  "BLOOD_PRESSURE_SYS",
+  "BLOOD_PRESSURE_DIA",
+  "PULSE",
+];
+
+export interface ReadingAnchor {
+  id: string;
+  type: MeasurementType | string;
+  source: string;
+  measuredAt: Date;
+  deletedAt?: Date | null;
+}
+
+type MeasurementReader = {
+  measurement: Pick<Prisma.TransactionClient["measurement"], "findMany">;
+};
+
+export interface ReadingSibling {
+  id: string;
+  type: MeasurementType;
+  measuredAt: Date;
+}
+
+/**
+ * The other rows of the readings `rows` belong to, not counting `rows`
+ * themselves. `state: "live"` finds the rows a delete takes with it;
+ * `state: "deletedWith"` finds the rows that were tombstoned in the same
+ * statement as their anchor (the identical `deletedAt`), which is what a
+ * restore brings back with it, and never a row deleted on its own.
+ */
+export async function bloodPressureSiblings(
+  db: MeasurementReader,
+  userId: string,
+  rows: readonly ReadingAnchor[],
+  state: "live" | "deletedWith",
+): Promise<ReadingSibling[]> {
+  const anchors = rows.filter(
+    (r) => BP_HALVES.has(r.type) && (state === "live" || r.deletedAt),
+  );
+  if (anchors.length === 0) return [];
+  const found = await db.measurement.findMany({
+    where: {
+      userId,
+      id: { notIn: rows.map((r) => r.id) },
+      type: { in: BP_READING_TYPES },
+      OR: anchors.map((a) => ({
+        source: a.source as Prisma.MeasurementWhereInput["source"],
+        measuredAt: a.measuredAt,
+        deletedAt: state === "live" ? null : a.deletedAt,
+      })),
+    },
+    select: { id: true, type: true, measuredAt: true },
+  });
+  return found;
+}
diff --git a/src/lib/openapi/routes/measurements.ts b/src/lib/openapi/routes/measurements.ts
index c8a3dc8af..b04e40220 100644
--- a/src/lib/openapi/routes/measurements.ts
+++ b/src/lib/openapi/routes/measurements.ts
@@ -1055,7 +1055,7 @@ export const measurementPaths: NonNullable<ZodOpenApiObject["paths"]> = {
       tags: ["Measurements"],
       summary: "Delete a measurement",
       description:
-        "Soft-deletes the row (tombstone) so paired clients can reconcile the deletion.",
+        "Soft-deletes the row (tombstone) so paired clients can reconcile the deletion. A blood-pressure systolic or diastolic takes the rest of its reading with it: the other half and the pulse with the same source and the identical `measuredAt`, tombstoned in the same transaction with the same `deletedAt`, each with its own `syncVersion` bump. A pulse is deleted on its own.",
       requestParams: { path: z.object({ id: z.string() }) },
       responses: {
         ...recordRefusal(),
@@ -1145,7 +1145,7 @@ export const measurementPaths: NonNullable<ZodOpenApiObject["paths"]> = {
       tags: ["Measurements"],
       summary: "Bulk soft-delete measurements",
       description:
-        "Soft-deletes (tombstones) up to 200 of the caller's measurement rows in one call, mirroring the single-DELETE contract. Idempotent via the `Idempotency-Key` header; rate-limited `measurements:bulk-delete:<userId>`. Forged / foreign / already-deleted ids are silently skipped — `deleted` is the count of rows actually tombstoned. The deletions surface in `/api/sync/changes` as tombstones.",
+        "Soft-deletes (tombstones) up to 200 of the caller's measurement rows in one call, mirroring the single-DELETE contract. Idempotent via the `Idempotency-Key` header; rate-limited `measurements:bulk-delete:<userId>`. Forged / foreign / already-deleted ids are silently skipped — `deleted` is the count of rows actually tombstoned, which includes the rest of any blood-pressure reading a selected systolic or diastolic belongs to (as on the single DELETE). The deletions surface in `/api/sync/changes` as tombstones.",
       requestBody: {
         required: true,
         content: {
@@ -1176,7 +1176,7 @@ export const measurementPaths: NonNullable<ZodOpenApiObject["paths"]> = {
       tags: ["Measurements"],
       summary: "Restore soft-deleted measurements",
       description:
-        "Un-tombstones up to 200 of the caller's soft-deleted measurement rows in one call — the delete-Undo counterpart to `/api/measurements/bulk-delete`. Idempotent via the `Idempotency-Key` header; rate-limited `measurements:restore:<userId>`. Forged / foreign / not-deleted ids are silently skipped — `restored` is the count of rows actually un-tombstoned. The restored rows re-surface in `/api/sync/changes` as upserts.",
+        "Un-tombstones up to 200 of the caller's soft-deleted measurement rows in one call — the delete-Undo counterpart to `/api/measurements/bulk-delete`. Idempotent via the `Idempotency-Key` header; rate-limited `measurements:restore:<userId>`. Forged / foreign / not-deleted ids are silently skipped — `restored` is the count of rows actually un-tombstoned. A blood-pressure systolic or diastolic also restores the rows of its reading that were deleted with it (same source, identical `measuredAt` and `deletedAt`), so naming one half undoes the whole reading; a row deleted at another moment stays deleted. The restored rows re-surface in `/api/sync/changes` as upserts.",
       requestBody: {
         required: true,
         content: {
diff --git a/tests/integration/blood-pressure-reading-delete.test.ts b/tests/integration/blood-pressure-reading-delete.test.ts
new file mode 100644
index 000000000..d7f4028d9
--- /dev/null
+++ b/tests/integration/blood-pressure-reading-delete.test.ts
@@ -0,0 +1,198 @@
+/**
+ * Deleting one row of a blood-pressure reading deletes the reading, through
+ * the real routes against a real Postgres.
+ *
+ * Systolic, diastolic and the cuff's pulse are three rows with no link
+ * column; they are one reading because every writer stores them with the
+ * same source at the same instant. Deleting the systolic used to tombstone
+ * only the systolic and leave a diastolic and a pulse behind. Now the
+ * single DELETE and the bulk delete take the whole reading, every row bumps
+ * its own syncVersion (so the sync feed carries each tombstone), and the
+ * undo, which names only the row the person tapped, brings the whole
+ * reading back. A reading of another source at the same instant, a reading
+ * a minute later, and a pulse deleted on its own are left alone.
+ */
+import { NextRequest } from "next/server";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import { cookieJar, headerJar } from "./mock-next-headers";
+import { getPrismaClient, truncateAllTables } from "./setup";
+
+vi.mock("next/headers", async () => {
+  const { cookieJar, headerJar } = await import("./mock-next-headers");
+  return {
+    headers: vi.fn(async () => ({
+      get: (name: string) => headerJar.get(name.toLowerCase()) ?? null,
+    })),
+    cookies: vi.fn(async () => ({
+      get: (name: string) => {
+        const value = cookieJar.get(name);
+        return value ? { name, value } : undefined;
+      },
+      set: (name: string, value: string) => {
+        cookieJar.set(name, value);
+      },
+      delete: (name: string) => {
+        cookieJar.delete(name);
+      },
+    })),
+  };
+});
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+const USER = "user-bp-reading-delete";
+const AT = new Date("2026-10-20T07:30:00.000Z");
+const MINUTE_LATER = new Date(AT.getTime() + 60_000);
+
+beforeEach(async () => {
+  const prisma = getPrismaClient();
+  await truncateAllTables(prisma);
+  cookieJar.clear();
+  headerJar.clear();
+  await prisma.user.create({
+    data: {
+      id: USER,
+      username: "bp-reading-delete",
+      email: "bp-reading-delete@example.test",
+    },
+  });
+  const session = await prisma.session.create({
+    data: { userId: USER, expiresAt: new Date(Date.now() + 3_600_000) },
+  });
+  cookieJar.set("healthlog_session", session.id);
+
+  const row = (
+    id: string,
+    type: "BLOOD_PRESSURE_SYS" | "BLOOD_PRESSURE_DIA" | "PULSE",
+    value: number,
+    source: "MANUAL" | "WITHINGS",
+    measuredAt: Date,
+  ) => ({
+    id,
+    userId: USER,
+    type,
+    value,
+    unit: type === "PULSE" ? "bpm" : "mmHg",
+    source,
+    measuredAt,
+  });
+  await prisma.measurement.createMany({
+    data: [
+      // The reading under test.
+      row("sys", "BLOOD_PRESSURE_SYS", 128, "MANUAL", AT),
+      row("dia", "BLOOD_PRESSURE_DIA", 82, "MANUAL", AT),
+      row("pulse", "PULSE", 64, "MANUAL", AT),
+      // The same instant from another source: another reading.
+      row("w-sys", "BLOOD_PRESSURE_SYS", 131, "WITHINGS", AT),
+      row("w-dia", "BLOOD_PRESSURE_DIA", 84, "WITHINGS", AT),
+      // A minute later from the same source: another reading.
+      row("next-sys", "BLOOD_PRESSURE_SYS", 125, "MANUAL", MINUTE_LATER),
+      row("next-dia", "BLOOD_PRESSURE_DIA", 80, "MANUAL", MINUTE_LATER),
+      row("next-pulse", "PULSE", 62, "MANUAL", MINUTE_LATER),
+    ],
+  });
+});
+
+async function rows(): Promise<
+  Record<string, { deleted: boolean; syncVersion: number }>
+> {
+  const all = await getPrismaClient().measurement.findMany({
+    where: { userId: USER },
+    select: { id: true, deletedAt: true, syncVersion: true },
+  });
+  return Object.fromEntries(
+    all.map((r) => [
+      r.id,
+      { deleted: r.deletedAt !== null, syncVersion: r.syncVersion },
+    ]),
+  );
+}
+
+const deletedIds = async () =>
+  Object.entries(await rows())
+    .filter(([, r]) => r.deleted)
+    .map(([id]) => id)
+    .sort();
+
+async function deleteOne(id: string) {
+  const { DELETE } = await import("@/app/api/measurements/[id]/route");
+  const res = await DELETE(
+    new NextRequest(`http://localhost/api/measurements/${id}`, {
+      method: "DELETE",
+    }),
+    { params: Promise.resolve({ id }) },
+  );
+  expect(res.status).toBe(200);
+}
+
+async function post(path: "bulk-delete" | "restore", ids: string[]) {
+  const route =
+    path === "bulk-delete"
+      ? await import("@/app/api/measurements/bulk-delete/route")
+      : await import("@/app/api/measurements/restore/route");
+  const res = await route.POST(
+    new NextRequest(`http://localhost/api/measurements/${path}`, {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ ids }),
+    }),
+  );
+  expect(res.status).toBe(200);
+  return (await res.json()).data as { deleted?: number; restored?: number };
+}
+
+describe("deleting a blood-pressure reading", () => {
+  it("takes the other half and the pulse with the systolic, and the undo brings all three back", async () => {
+    await deleteOne("sys");
+
+    expect(await deletedIds()).toEqual(["dia", "pulse", "sys"]);
+    const after = await rows();
+    for (const id of ["sys", "dia", "pulse"]) {
+      expect(after[id]!.syncVersion).toBe(2);
+    }
+    for (const id of ["w-sys", "w-dia", "next-sys", "next-dia"]) {
+      expect(after[id]!.syncVersion).toBe(1);
+    }
+
+    // The undo names only the row that was tapped.
+    const { restored } = await post("restore", ["sys"]);
+    expect(restored).toBe(3);
+    expect(await deletedIds()).toEqual([]);
+  });
+
+  it("takes the systolic and the pulse with the diastolic", async () => {
+    await deleteOne("dia");
+    expect(await deletedIds()).toEqual(["dia", "pulse", "sys"]);
+  });
+
+  it("deletes a pulse on its own, and its undo leaves the reading as it was", async () => {
+    await deleteOne("pulse");
+    expect(await deletedIds()).toEqual(["pulse"]);
+    await post("restore", ["pulse"]);
+    expect(await deletedIds()).toEqual([]);
+  });
+
+  it("does the same for the bulk delete, and restores only what went in the same delete", async () => {
+    // The pulse of the second reading was deleted on its own earlier.
+    await deleteOne("next-pulse");
+
+    const { deleted } = await post("bulk-delete", ["sys", "next-dia"]);
+    expect(deleted).toBe(5);
+    expect(await deletedIds()).toEqual([
+      "dia",
+      "next-dia",
+      "next-pulse",
+      "next-sys",
+      "pulse",
+      "sys",
+    ]);
+
+    const { restored } = await post("restore", ["sys", "next-dia"]);
+    expect(restored).toBe(5);
+    // The pulse deleted at another moment stays deleted.
+    expect(await deletedIds()).toEqual(["next-pulse"]);
+  });
+});
diff --git a/tests/integration/document-undated-lab-value.test.ts b/tests/integration/document-undated-lab-value.test.ts
new file mode 100644
index 000000000..154bb4619
--- /dev/null
+++ b/tests/integration/document-undated-lab-value.test.ts
@@ -0,0 +1,222 @@
+/**
+ * A lab value without its own date, confirmed from a stored document, against
+ * a real Postgres and through the real confirm route.
+ *
+ * A lab report usually prints the collection date once, in its header. The
+ * extraction puts that date on the document (`reportDate`) and leaves each
+ * value's own date empty, so the confirm step has to date the value by its
+ * document. It used to file every such reading under the moment it was
+ * confirmed, so a report from years ago showed up as today's results.
+ *
+ * The route reads the document's two dates once and hands them to the commit
+ * step: the report date first, else the filing date (`documentDate`), the order
+ * the day view places a document by. A value's own date still wins, but only
+ * when it names a real calendar day.
+ */
+import { NextRequest } from "next/server";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import { cookieJar } from "./mock-next-headers";
+import { getPrismaClient, truncateAllTables } from "./setup";
+
+const USER_ID = "user-undated-lab-value";
+
+vi.mock("next/headers", async () => {
+  const { cookieJar, headerJar } = await import("./mock-next-headers");
+  return {
+    headers: vi.fn(async () => ({
+      get: (name: string) => headerJar.get(name.toLowerCase()) ?? null,
+    })),
+    cookies: vi.fn(async () => ({
+      get: (name: string) => {
+        const value = cookieJar.get(name);
+        return value ? { name, value } : undefined;
+      },
+      set: (name: string, value: string) => {
+        cookieJar.set(name, value);
+      },
+      delete: (name: string) => {
+        cookieJar.delete(name);
+      },
+    })),
+  };
+});
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+beforeEach(async () => {
+  await truncateAllTables(getPrismaClient());
+  cookieJar.clear();
+  const prisma = getPrismaClient();
+  await prisma.user.create({
+    data: {
+      id: USER_ID,
+      username: "undated-lab-value",
+      email: "undated-lab-value@example.test",
+      modulePreferencesJson: { inboundDocuments: true, labs: true },
+    },
+  });
+  const session = await prisma.session.create({
+    data: { userId: USER_ID, expiresAt: new Date(Date.now() + 3_600_000) },
+  });
+  cookieJar.set("healthlog_session", session.id);
+  for (const [name, unit] of [
+    ["Ferritin", "ng/mL"],
+    ["Glucose", "mmol/L"],
+    ["Haemoglobin", "g/L"],
+  ]) {
+    await prisma.biomarker.create({ data: { userId: USER_ID, name, unit } });
+  }
+});
+
+const noon = (day: string) => new Date(`${day}T12:00:00.000Z`);
+
+async function storedDocument(dates: {
+  reportDate: string | null;
+  documentDate: string | null;
+}) {
+  return getPrismaClient().inboundDocument.create({
+    data: {
+      userId: USER_ID,
+      filename: "befund.pdf",
+      mimeType: "application/pdf",
+      byteSize: 1024,
+      contentEncrypted: Buffer.from("stand-in for the stored bytes"),
+      status: "EXTRACTED",
+      reportDate: dates.reportDate ? noon(dates.reportDate) : null,
+      documentDate: dates.documentDate ? noon(dates.documentDate) : null,
+    },
+  });
+}
+
+async function stagedValue(
+  documentId: string,
+  label: string,
+  value: number,
+  unit: string,
+  effectiveDate: string | null,
+) {
+  const { encryptFactData, encryptFactProvenance } =
+    await import("@/lib/documents/store");
+  return getPrismaClient().extractedFact.create({
+    data: {
+      documentId,
+      userId: USER_ID,
+      factType: "OBSERVATION",
+      status: "PENDING",
+      confidence: 0.95,
+      needsReview: false,
+      dataEncrypted: encryptFactData({
+        label,
+        code: null,
+        codeSystem: null,
+        value,
+        valueText: null,
+        unit,
+        referenceLow: null,
+        referenceHigh: null,
+        referenceText: null,
+        effectiveDate,
+      }),
+      provenanceEncrypted: encryptFactProvenance({
+        sourceText: `${label} ${value} ${unit}`,
+        anchored: true,
+        sourceOffset: 0,
+        page: 0,
+        confidence: 0.95,
+      }),
+    },
+  });
+}
+
+async function confirm(documentId: string, factIds: string[]) {
+  const { POST } =
+    await import("@/app/api/documents/inbound/[id]/confirm/route");
+  const res = await POST(
+    new NextRequest(
+      `http://localhost/api/documents/inbound/${documentId}/confirm`,
+      {
+        method: "POST",
+        headers: { "content-type": "application/json" },
+        body: JSON.stringify({
+          decisions: factIds.map((factId) => ({ factId, action: "approve" })),
+        }),
+      },
+    ),
+    { params: Promise.resolve({ id: documentId }) },
+  );
+  expect(res.status).toBe(200);
+  const body = await res.json();
+  expect(body.data.failed).toEqual([]);
+  expect(body.data.approved).toHaveLength(factIds.length);
+  return body.data.approved as { factId: string; recordId: string }[];
+}
+
+async function takenAtOf(recordId: string) {
+  const row = await getPrismaClient().labResult.findUniqueOrThrow({
+    where: { id: recordId },
+  });
+  return row.takenAt.toISOString();
+}
+
+describe("an undated lab value is dated by its document", () => {
+  it("takes the report date over the filing date, keeps a value's own date, and ignores an impossible one", async () => {
+    const today = new Date().toISOString().slice(0, 10);
+    // Collection date printed once in the header; filed today (the upload-day
+    // default for documentDate).
+    const doc = await storedDocument({
+      reportDate: "2021-03-01",
+      documentDate: today,
+    });
+    const undated = await stagedValue(doc.id, "Ferritin", 80, "ng/mL", null);
+    const ownDate = await stagedValue(
+      doc.id,
+      "Glucose",
+      5.1,
+      "mmol/L",
+      "2021-02-20",
+    );
+    const impossible = await stagedValue(
+      doc.id,
+      "Haemoglobin",
+      142,
+      "g/L",
+      "2021-02-30",
+    );
+
+    const approved = await confirm(doc.id, [
+      undated.id,
+      ownDate.id,
+      impossible.id,
+    ]);
+    const recordOf = (factId: string) =>
+      approved.find((a) => a.factId === factId)!.recordId;
+
+    expect(await takenAtOf(recordOf(undated.id))).toBe(
+      "2021-03-01T12:00:00.000Z",
+    );
+    expect(await takenAtOf(recordOf(ownDate.id))).toBe(
+      "2021-02-20T12:00:00.000Z",
+    );
+    // Not 2 March: a day the month does not have is no date at all.
+    expect(await takenAtOf(recordOf(impossible.id))).toBe(
+      "2021-03-01T12:00:00.000Z",
+    );
+  });
+
+  it("takes the filing date when the document has no report date", async () => {
+    const doc = await storedDocument({
+      reportDate: null,
+      documentDate: "2021-02-15",
+    });
+    const undated = await stagedValue(doc.id, "Ferritin", 80, "ng/mL", null);
+
+    const [approved] = await confirm(doc.id, [undated.id]);
+
+    expect(await takenAtOf(approved!.recordId)).toBe(
+      "2021-02-15T12:00:00.000Z",
+    );
+  });
+});
diff --git a/tests/integration/lab-document-date-repair.test.ts b/tests/integration/lab-document-date-repair.test.ts
new file mode 100644
index 000000000..82c6aa086
--- /dev/null
+++ b/tests/integration/lab-document-date-repair.test.ts
@@ -0,0 +1,232 @@
+/**
+ * The one-shot repair of lab values a document confirm filed under the
+ * moment of confirmation (real Postgres).
+ *
+ * Before the confirm step dated an undated value by its document, such a
+ * value got `takenAt = now`, the same instant as its `createdAt`. The repair
+ * moves exactly those to the document's report date (else its filing date)
+ * at noon UTC, and leaves alone a value with a date of its own, a value that
+ * really was taken on its confirmation day in the owner's zone, one the
+ * person re-dated since, and one whose document has no date. A second run
+ * changes nothing.
+ */
+import { beforeEach, describe, expect, it } from "vitest";
+
+import { encryptFactData, encryptFactProvenance } from "@/lib/documents/store";
+import { repairUndatedDocumentLabValues } from "@/lib/jobs/lab-document-date-repair";
+import { getPrismaClient, truncateAllTables } from "./setup";
+
+const USER = "user-lab-document-date-repair";
+const noon = (day: string) => new Date(`${day}T12:00:00.000Z`);
+
+beforeEach(async () => {
+  const prisma = getPrismaClient();
+  await truncateAllTables(prisma);
+  await prisma.user.create({
+    data: {
+      id: USER,
+      username: "lab-date-repair",
+      email: "lab-date-repair@example.test",
+      timezone: "Europe/Berlin",
+    },
+  });
+});
+
+/**
+ * A document, one confirmed value from it and the fact that links the two,
+ * as the confirm route left them.
+ */
+async function confirmedValue(opts: {
+  id: string;
+  reportDate: string | null;
+  documentDate: string | null;
+  effectiveDate: string | null;
+  createdAt: Date;
+  takenAt: Date;
+}) {
+  const prisma = getPrismaClient();
+  const doc = await prisma.inboundDocument.create({
+    data: {
+      userId: USER,
+      filename: `${opts.id}.pdf`,
+      mimeType: "application/pdf",
+      byteSize: 1024,
+      contentEncrypted: Buffer.from("stand-in for the stored bytes"),
+      status: "CONFIRMED",
+      reportDate: opts.reportDate ? noon(opts.reportDate) : null,
+      documentDate: opts.documentDate ? noon(opts.documentDate) : null,
+    },
+  });
+  await prisma.labResult.create({
+    data: {
+      id: opts.id,
+      userId: USER,
+      analyte: "Ferritin",
+      value: 80,
+      unit: "ng/mL",
+      source: "DOCUMENT",
+      takenAt: opts.takenAt,
+      createdAt: opts.createdAt,
+    },
+  });
+  await prisma.extractedFact.create({
+    data: {
+      documentId: doc.id,
+      userId: USER,
+      factType: "OBSERVATION",
+      status: "APPROVED",
+      confidence: 0.95,
+      needsReview: false,
+      dataEncrypted: encryptFactData({
+        label: "Ferritin",
+        code: null,
+        codeSystem: null,
+        value: 80,
+        valueText: null,
+        unit: "ng/mL",
+        referenceLow: null,
+        referenceHigh: null,
+        referenceText: null,
+        effectiveDate: opts.effectiveDate,
+      }),
+      provenanceEncrypted: encryptFactProvenance({
+        sourceText: "Ferritin 80 ng/mL",
+        anchored: true,
+        sourceOffset: 0,
+        page: 0,
+        confidence: 0.95,
+      }),
+      committedRecordId: opts.id,
+      committedRecordType: "labResult",
+    },
+  });
+}
+
+async function takenAt(): Promise<Record<string, string>> {
+  const rows = await getPrismaClient().labResult.findMany({
+    where: { userId: USER },
+    select: { id: true, takenAt: true },
+  });
+  return Object.fromEntries(rows.map((r) => [r.id, r.takenAt.toISOString()]));
+}
+
+describe("lab document date repair", () => {
+  it("moves only values filed under their confirmation moment, and converges", async () => {
+    const confirmed = new Date("2026-10-20T08:00:00.123Z");
+
+    // Collection date in the header, value undated, filed at confirmation.
+    await confirmedValue({
+      id: "misdated",
+      reportDate: "2021-03-01",
+      documentDate: "2026-10-18",
+      effectiveDate: null,
+      createdAt: confirmed,
+      takenAt: confirmed,
+    });
+    // No report date: the filing date is the document's day.
+    await confirmedValue({
+      id: "misdated-filing-date",
+      reportDate: null,
+      documentDate: "2021-02-15",
+      effectiveDate: null,
+      createdAt: confirmed,
+      takenAt: new Date(confirmed.getTime() + 2),
+    });
+    // Its own date, even where the row looks like a confirmation moment.
+    await confirmedValue({
+      id: "own-date",
+      reportDate: "2021-03-01",
+      documentDate: null,
+      effectiveDate: "2021-02-20",
+      createdAt: confirmed,
+      takenAt: confirmed,
+    });
+    // Confirmed at 00:30 in Berlin on the report day itself: 22:30 UTC the
+    // evening before, which a UTC comparison would have moved.
+    const justAfterMidnight = new Date("2026-10-19T22:30:00.000Z");
+    await confirmedValue({
+      id: "taken-on-confirm-day",
+      reportDate: "2026-10-20",
+      documentDate: "2026-10-20",
+      effectiveDate: null,
+      createdAt: justAfterMidnight,
+      takenAt: justAfterMidnight,
+    });
+    // Re-dated by the person after the confirm.
+    await confirmedValue({
+      id: "re-dated",
+      reportDate: "2021-03-01",
+      documentDate: null,
+      effectiveDate: null,
+      createdAt: confirmed,
+      takenAt: new Date("2026-10-01T07:45:00.000Z"),
+    });
+    // A document with no date at all leaves nothing to move to.
+    await confirmedValue({
+      id: "undated-document",
+      reportDate: null,
+      documentDate: null,
+      effectiveDate: null,
+      createdAt: confirmed,
+      takenAt: confirmed,
+    });
+
+    const before = await takenAt();
+    const first = await repairUndatedDocumentLabValues(getPrismaClient());
+
+    expect(first.updated).toBe(2);
+    expect(await takenAt()).toEqual({
+      ...before,
+      misdated: "2021-03-01T12:00:00.000Z",
+      "misdated-filing-date": "2021-02-15T12:00:00.000Z",
+    });
+
+    const afterFirst = await takenAt();
+    const second = await repairUndatedDocumentLabValues(getPrismaClient());
+    expect(second.updated).toBe(0);
+    expect(await takenAt()).toEqual(afterFirst);
+  });
+
+  it("leaves a lab value alone when a second fact also names it", async () => {
+    const confirmed = new Date("2026-10-20T08:00:00.000Z");
+    await confirmedValue({
+      id: "linked-twice",
+      reportDate: "2021-03-01",
+      documentDate: null,
+      effectiveDate: null,
+      createdAt: confirmed,
+      takenAt: confirmed,
+    });
+    const prisma = getPrismaClient();
+    const second = await prisma.inboundDocument.create({
+      data: {
+        userId: USER,
+        filename: "other.pdf",
+        mimeType: "application/pdf",
+        byteSize: 1,
+        contentEncrypted: Buffer.from("x"),
+        reportDate: noon("2020-01-01"),
+      },
+    });
+    const fact = await prisma.extractedFact.findFirstOrThrow({
+      where: { committedRecordId: "linked-twice" },
+    });
+    await prisma.extractedFact.create({
+      data: {
+        documentId: second.id,
+        userId: USER,
+        factType: "OBSERVATION",
+        status: "APPROVED",
+        dataEncrypted: fact.dataEncrypted,
+        provenanceEncrypted: fact.provenanceEncrypted,
+        committedRecordId: "linked-twice",
+        committedRecordType: "labResult",
+      },
+    });
+
+    const result = await repairUndatedDocumentLabValues(prisma);
+
+    expect(result.updated).toBe(0);
+    expect((await takenAt())["linked-twice"]).toBe(confirmed.toISOString());
+  });
+});