diff --git a/frontend/src/app/api/account/route.ts b/frontend/src/app/api/account/route.ts
index 2d7040a3..0a8daad6 100644
--- a/frontend/src/app/api/account/route.ts
+++ b/frontend/src/app/api/account/route.ts
@@ -11,6 +11,12 @@ type ProfilePatchPayload = {
   name?: unknown;
   birth_date?: unknown;
   birth_time?: unknown;
+  reported_birth_time?: unknown;
+  birth_time_source?: unknown;
+  birth_time_period?: unknown;
+  birth_time_clue?: unknown;
+  uncertainty_before_minutes?: unknown;
+  uncertainty_after_minutes?: unknown;
   country_code?: unknown;
   province_code?: unknown;
   city_code?: unknown;
@@ -20,6 +26,9 @@ type ProfilePatchPayload = {
   timezone_offset?: unknown;
 };
 
+const birthTimeSources = ["hospital_record", "family_exact", "approximate", "period_only", "unknown", "legacy_import"] as const;
+const birthTimePeriods = ["early_morning", "morning", "afternoon", "evening", "late_night"] as const;
+
 function nullableString(value: unknown) {
   return typeof value === "string" && value.trim() ? value.trim() : null;
 }
@@ -28,6 +37,14 @@ function nullableNumber(value: unknown) {
   return typeof value === "number" && Number.isFinite(value) ? value : null;
 }
 
+function nullableInteger(value: unknown) {
+  return typeof value === "number" && Number.isInteger(value) ? value : null;
+}
+
+function nullableChoice(value: unknown, choices: readonly string[]) {
+  return typeof value === "string" && choices.includes(value) ? value : null;
+}
+
 function isMissingProfileColumn(error: { code?: string; message?: string } | null) {
   const message = error?.message?.toLowerCase() ?? "";
   return error?.code === "PGRST204"
@@ -88,6 +105,12 @@ export async function PATCH(request: Request) {
       name: nullableString(payload.name),
       birth_date: nullableString(payload.birth_date),
       birth_time: nullableString(payload.birth_time),
+      reported_birth_time: nullableString(payload.reported_birth_time),
+      birth_time_source: nullableChoice(payload.birth_time_source, birthTimeSources),
+      birth_time_period: nullableChoice(payload.birth_time_period, birthTimePeriods),
+      birth_time_clue: nullableString(payload.birth_time_clue),
+      uncertainty_before_minutes: nullableInteger(payload.uncertainty_before_minutes),
+      uncertainty_after_minutes: nullableInteger(payload.uncertainty_after_minutes),
       country_code: nullableString(payload.country_code),
       province_code: nullableString(payload.province_code),
       city_code: nullableString(payload.city_code),
diff --git a/frontend/supabase/migrations/20260718103000_profile_birth_time_declaration_grants.sql b/frontend/supabase/migrations/20260718103000_profile_birth_time_declaration_grants.sql
new file mode 100644
index 00000000..efb82d22
--- /dev/null
+++ b/frontend/supabase/migrations/20260718103000_profile_birth_time_declaration_grants.sql
@@ -0,0 +1,21 @@
+begin;
+
+grant insert (
+  reported_birth_time,
+  birth_time_source,
+  birth_time_period,
+  birth_time_clue,
+  uncertainty_before_minutes,
+  uncertainty_after_minutes
+) on table public.profiles to service_role;
+
+grant select (
+  reported_birth_time,
+  birth_time_source,
+  birth_time_period,
+  birth_time_clue,
+  uncertainty_before_minutes,
+  uncertainty_after_minutes
+) on table public.profiles to service_role;
+
+commit;
diff --git a/frontend/tests/profile-persistence.test.ts b/frontend/tests/profile-persistence.test.ts
index 8fbd5007..7f69eda7 100644
--- a/frontend/tests/profile-persistence.test.ts
+++ b/frontend/tests/profile-persistence.test.ts
@@ -20,6 +20,42 @@ test("account route can fall back when coordinate columns are not deployed", ()
   assert.match(source, /PGRST204|42703|schema cache|column/i);
 });
 
+test("account route persists the birth-time declaration before assessment", () => {
+  // Given: the birthday step submits a reported time and its source metadata.
+  const source = readFileSync(new URL("../src/app/api/account/route.ts", import.meta.url), "utf8");
+  const declarationColumns = [
+    "reported_birth_time",
+    "birth_time_source",
+    "birth_time_period",
+    "birth_time_clue",
+    "uncertainty_before_minutes",
+    "uncertainty_after_minutes",
+  ] as const;
+
+  // When: /api/account builds the profile upsert.
+  // Then: every declaration field must cross the route boundary instead of being dropped.
+  for (const column of declarationColumns) {
+    assert.match(source, new RegExp(`${column}:\\s*nullable`), `${column} is not persisted`);
+  }
+  assert.match(source, /birthTimeSources\s*=\s*\[[\s\S]*"legacy_import"/);
+});
+
+test("service role can insert and read birth-time declaration columns during profile upsert", () => {
+  // Given: onboarding creates the profile before the birthday declaration is known.
+  const migration = readFileSync(
+    new URL(
+      "../supabase/migrations/20260718103000_profile_birth_time_declaration_grants.sql",
+      import.meta.url,
+    ),
+    "utf8",
+  );
+
+  // When: the existing profile is upserted after the birthday step.
+  // Then: PostgREST may insert and read all declaration columns used by that upsert.
+  assert.match(migration, /grant\s+insert\s*\([\s\S]*reported_birth_time[\s\S]*birth_time_source[\s\S]*uncertainty_after_minutes[\s\S]*\)\s*on\s+table\s+public\.profiles\s+to\s+service_role/i);
+  assert.match(migration, /grant\s+select\s*\([\s\S]*reported_birth_time[\s\S]*birth_time_source[\s\S]*uncertainty_after_minutes[\s\S]*\)\s*on\s+table\s+public\.profiles\s+to\s+service_role/i);
+});
+
 test("service role can read every column used by account profile upserts", () => {
   // Given: the least-privilege grant omitted two columns submitted by /api/account.
   const migration = readFileSync(