fix(backup): carry the aggregation provenance through backup and restore

The disaster-recovery backup selected every Measurement scalar except the
aggregation fields, so a restore brought every `stats:` aggregate back with no
provenance and the Apple Health authority ladder came back flat: an export.xml
source-day estimate could then overwrite a native HealthKit statistic.

`aggregationProvenance` now rides the select, the disaster-recovery
serialization, the payload schema and the restore mapping, following
`externalSourceVersion` exactly — including staying out of the reduced
portable shape, which carries the human-readable subset only. The schema field
is optional, so every backup written before this parses unchanged.

Restoring one of those older backups no longer recreates the ambiguity
migration 0263 repaired: an Apple Health row under a `stats:` identity with no
provenance comes back as LEGACY_UNKNOWN, the sentinel the cumulative drain
already writes in that situation, so a native sync or archive reprocess can
repair it. The gate is scoped as 0263 scoped its backfill — other providers
mint `stats:` identities for their cumulative dailies and have never carried
provenance, and ordinary point rows keep NULL.

src/lib/export/__tests__/full-backup-payload.test.ts

@@ -204,6 +204,7 @@ function installSectionMocks() {
     notesEncrypted: measurementNote,
     externalId: "oura-stage-deep",
     externalSourceVersion: "oura-v3",
+    aggregationProvenance: "HEALTHKIT_STATISTICS",
     glucoseContext: null,
     sleepStage: "DEEP",
     rhythmClassification: null,
@@ -297,6 +298,7 @@ describe("buildFullBackupPayload disaster-recovery mode", () => {
           notesEncrypted: Buffer.from(measurementNote).toString("base64"),
           externalId: "oura-stage-deep",
           externalSourceVersion: "oura-v3",
+          aggregationProvenance: "HEALTHKIT_STATISTICS",
           glucoseContext: null,
           sleepStage: "DEEP",
           rhythmClassification: null,
@@ -371,3 +373,72 @@ describe("buildFullBackupPayload disaster-recovery mode", () => {
     ).rejects.toBe(failure);
   });
 });
+
+/**
+ * `aggregationProvenance` is what stops an export.xml source-day estimate from
+ * overwriting a native HealthKit statistic. A disaster-recovery backup that
+ * drops it restores a flattened authority ladder, so it rides the select and
+ * the disaster-recovery serialization the same way `externalSourceVersion`
+ * does — and stays out of the reduced portable shape, also like
+ * `externalSourceVersion`.
+ *
+ * Mutation check: drop `aggregationProvenance: true` from the select, or drop
+ * the field from the disaster-recovery arm, and the first two cases go red.
+ */
+describe("buildFullBackupPayload — aggregation provenance", () => {
+  it("selects the provenance column", async () => {
+    installSectionMocks();
+    const prisma = makePrisma();
+
+    await buildFullBackupPayload(prisma as never, "user-1", {
+      purpose: "disaster-recovery",
+      exportedAt: new Date("2026-07-20T00:00:00.000Z"),
+    });
+
+    expect(mocks.iterateMeasurementPages).toHaveBeenCalledWith(
+      prisma,
+      expect.anything(),
+      expect.objectContaining({ aggregationProvenance: true }),
+    );
+  });
+
+  it("carries the provenance into the disaster-recovery payload", async () => {
+    installSectionMocks();
+    const prisma = makePrisma();
+
+    const { payload } = await buildFullBackupPayload(
+      prisma as never,
+      "user-1",
+      {
+        purpose: "disaster-recovery",
+        exportedAt: new Date("2026-07-20T00:00:00.000Z"),
+      },
+    );
+
+    const rows = payload.measurements as Array<Record<string, unknown>>;
+    expect(rows[0]).toHaveProperty(
+      "aggregationProvenance",
+      "HEALTHKIT_STATISTICS",
+    );
+  });
+
+  it("leaves the provenance out of the reduced portable shape", async () => {
+    installSectionMocks();
+    const prisma = makePrisma();
+
+    const { payload } = await buildFullBackupPayload(
+      prisma as never,
+      "user-1",
+      {
+        purpose: "portable-export",
+        exportedAt: new Date("2026-07-20T00:00:00.000Z"),
+      },
+    );
+
+    const rows = payload.measurements as Array<Record<string, unknown>>;
+    // The portable arm carries the human-readable subset only — no
+    // externalSourceVersion, no glucoseContext, and no provenance either.
+    expect(rows[0]).not.toHaveProperty("aggregationProvenance");
+    expect(rows[0]).not.toHaveProperty("externalSourceVersion");
+  });
+});

src/lib/export/full-backup-payload.ts

@@ -83,6 +83,7 @@ export async function buildFullBackupPayload(
           notesEncrypted: true,
           externalId: true,
           externalSourceVersion: true,
+          aggregationProvenance: true,
           glucoseContext: true,
           sleepStage: true,
           rhythmClassification: true,
@@ -112,6 +113,7 @@ export async function buildFullBackupPayload(
                     : null,
                   externalId: measurement.externalId,
                   externalSourceVersion: measurement.externalSourceVersion,
+                  aggregationProvenance: measurement.aggregationProvenance,
                   glucoseContext: measurement.glucoseContext,
                   sleepStage: measurement.sleepStage,
                   rhythmClassification: measurement.rhythmClassification,

src/lib/onboarding/goals.ts

@@ -6,9 +6,11 @@
  * personalization signal: which dashboard tiles get promoted to the
  * top and made visible. Goals are NOT a clinical target store — the
  * targets surface (`/api/insights/targets`) is fully derived from
- * height/age/gender + clinical references. Their only leverage is
- * (a) dashboard tile pinning (here) and (b) reminder suggestions
- * (read by the reminders panel from `User.onboardingGoals`).
+ * height/age/gender + clinical references. Their only leverage is the
+ * one-time dashboard tile pinning below, applied by
+ * `/api/onboarding/step` while the layout is still unset. Nothing else
+ * reads `User.onboardingGoals` — the column is collected, seeded from
+ * once, and then inert.
  *
  * One home for the slug enum so the API validation
  * (`/api/onboarding/step`), the client picker, and the seeding all

src/lib/validations/backup.ts

@@ -43,6 +43,7 @@ import {
   InjectionSite,
   IntakeAttributionSource,
   IntakeSource,
+  MeasurementAggregationProvenance,
   MeasurementSource,
   MeasurementType,
   MedicationCategory,
@@ -86,6 +87,12 @@ const measurementSchema = z
     notesEncrypted: base64BytesSchema.nullable().optional(),
     externalId: z.string().nullable().optional(),
     externalSourceVersion: z.string().nullable().optional(),
+    // Authority of a `stats:` aggregate. `.optional()` keeps every backup
+    // written before this field rode the payload parseable.
+    aggregationProvenance: z
+      .enum(MeasurementAggregationProvenance)
+      .nullable()
+      .optional(),
     glucoseContext: z.enum(GlucoseContext).nullable().optional(),
     sleepStage: z.enum(SleepStage).nullable().optional(),
     rhythmClassification: z.enum(RhythmClassification).nullable().optional(),