test(anamnesis): drive the life circumstances, AUDIT-C and its backup through real Postgres and the manage matrix

src/app/api/anamnesis/facts/[id]/route.ts

@@ -16,7 +16,7 @@ import {
   correctLifeFact,
   removeHealthProfileFact,
 } from "@/lib/profile/health-facts";
-import { dayStartUtc } from "@/lib/profile/life-derived";
+import { dateOnlyAtNoonUtc } from "@/lib/tz/date-only";
 import {
   validateCorrectedFactValue,
   type HealthProfileFactKind,
@@ -63,7 +63,7 @@ export const PATCH = apiHandler(
     // circumstances (v1.43, #614).
     const now = new Date();
     const validFrom = parsed.data.validFrom
-      ? dayStartUtc(parsed.data.validFrom)
+      ? dateOnlyAtNoonUtc(parsed.data.validFrom)
       : undefined;
     let corrected: { id: string; kind: string } | null;
     if (isLifeFactKind(current.kind)) {

src/app/api/anamnesis/facts/route.ts

@@ -17,7 +17,7 @@ import {
   createLifeFact,
   readHealthProfileFacts,
 } from "@/lib/profile/health-facts";
-import { dayStartUtc } from "@/lib/profile/life-derived";
+import { dateOnlyAtNoonUtc } from "@/lib/tz/date-only";
 import { factWriteSchema } from "@/lib/validations/life-circumstances";
 
 /**
@@ -51,7 +51,7 @@ async function postFact(request: NextRequest): Promise<Response> {
 
   const now = new Date();
   const validFrom = parsed.data.validFrom
-    ? dayStartUtc(parsed.data.validFrom)
+    ? dateOnlyAtNoonUtc(parsed.data.validFrom)
     : undefined;
   try {
     const input = parsed.data;

src/lib/ai/coach/about-me.ts

@@ -27,6 +27,7 @@
  * Server-only — reads `@/lib/db`.
  */
 import { prisma } from "@/lib/db";
+import { userDayKey } from "@/lib/tz/format";
 import { getEvent } from "@/lib/logging/context";
 import { decryptFromBytes, encryptToBytes } from "@/lib/ai/coach/bytes-codec";
 import {
@@ -508,6 +509,8 @@ export interface LifeFactForPrompt {
 export interface AuditCForPrompt {
   totalScore: number;
   takenAt: Date;
+  /** The zone the entry was taken in, for its calendar day. */
+  tz: string;
   cutoff: number | null;
   aboveCutoff: boolean | null;
 }
@@ -624,7 +627,7 @@ export function composeLifeCircumstancesText(
     lines.push(
       `${L.auditC}: ${fill(L.auditCValue, {
         score: auditC.totalScore,
-        date: auditC.takenAt.toISOString().slice(0, 10),
+        date: userDayKey(auditC.takenAt, auditC.tz),
       })}${verdict}`,
     );
   }
@@ -645,12 +648,12 @@ async function loadAuditCForPrompt(
   const audit = await prisma.mentalHealthAssessment.findFirst({
     where: { userId, instrument: "AUDIT_C", deletedAt: null },
     orderBy: [{ takenAt: "desc" }, { id: "desc" }],
-    select: { totalScore: true, takenAt: true, locale: true },
+    select: { totalScore: true, takenAt: true, locale: true, tz: true },
   });
   if (!audit) return null;
   const user = await prisma.user.findUnique({
     where: { id: userId },
-    select: { gender: true, locale: true },
+    select: { gender: true, locale: true, timezone: true },
   });
   const cutoff = auditCCutoff(
     audit.locale,
@@ -660,6 +663,7 @@ async function loadAuditCForPrompt(
   return {
     totalScore: audit.totalScore,
     takenAt: audit.takenAt,
+    tz: audit.tz ?? user?.timezone ?? "UTC",
     cutoff: cutoff?.value ?? null,
     aboveCutoff: cutoff ? audit.totalScore >= cutoff.value : null,
   };

src/lib/profile/life-derived.ts

@@ -62,11 +62,6 @@ export const LIFE_KIND_AI_SECTION: Readonly<
 export const REVIEW_AFTER_DAYS = 365;
 const MS_PER_DAY = 86_400_000;
 
-/** UTC midnight of a `YYYY-MM-DD` calendar day. */
-export function dayStartUtc(day: string): Date {
-  return new Date(`${day}T00:00:00.000Z`);
-}
-
 /** Whether an instant is at least `REVIEW_AFTER_DAYS` before `now`. */
 export function isReviewDue(at: Date | null, now: Date): boolean {
   return (

src/lib/validations/life-circumstances.ts

@@ -249,7 +249,7 @@ const validFromDay = z.iso
   .date()
   .optional()
   .describe(
-    "The calendar day the answer holds from (UTC midnight). Omitted, it holds from now. Never later than today; an earlier day than the end of the previous answer of the same kind starts at that end instead.",
+    "The calendar day the answer holds from, stored at noon UTC like every date-only value. Omitted, it holds from now. Never later than today; an earlier day than the end of the previous answer of the same kind starts at that end instead.",
   );
 
 /**