diff --git a/frontend/supabase/migrations/20260717020000_birth_time_journey.sql b/frontend/supabase/migrations/20260717020000_birth_time_journey.sql
new file mode 100644
index 00000000..495cce2d
--- /dev/null
+++ b/frontend/supabase/migrations/20260717020000_birth_time_journey.sql
@@ -0,0 +1,211 @@
+begin;
+
+alter table public.profiles
+  add column if not exists reported_birth_time time without time zone,
+  add column if not exists active_birth_time time without time zone,
+  add column if not exists birth_time_source text,
+  add column if not exists birth_time_period text,
+  add column if not exists birth_time_clue text,
+  add column if not exists uncertainty_before_minutes integer,
+  add column if not exists uncertainty_after_minutes integer,
+  add column if not exists birth_time_status text,
+  add column if not exists rectification_confidence numeric(5, 2),
+  add column if not exists rectification_case_id uuid;
+
+update public.profiles
+set
+  reported_birth_time = coalesce(reported_birth_time, birth_time),
+  active_birth_time = coalesce(active_birth_time, birth_time),
+  birth_time_source = coalesce(birth_time_source, 'legacy_import'),
+  birth_time_status = coalesce(birth_time_status, 'confirmed')
+where birth_time is not null;
+
+alter table public.profiles
+  drop constraint if exists profiles_birth_time_source_check,
+  drop constraint if exists profiles_birth_time_period_check,
+  drop constraint if exists profiles_birth_time_status_check,
+  drop constraint if exists profiles_uncertainty_before_range,
+  drop constraint if exists profiles_uncertainty_after_range,
+  drop constraint if exists profiles_rectification_confidence_range;
+
+alter table public.profiles
+  add constraint profiles_birth_time_source_check check (
+    birth_time_source is null or birth_time_source in (
+      'hospital_record',
+      'family_exact',
+      'approximate',
+      'period_only',
+      'unknown',
+      'legacy_import'
+    )
+  ),
+  add constraint profiles_birth_time_period_check check (
+    birth_time_period is null or birth_time_period in (
+      'early_morning',
+      'morning',
+      'afternoon',
+      'evening',
+      'late_night'
+    )
+  ),
+  add constraint profiles_birth_time_status_check check (
+    birth_time_status is null or birth_time_status in (
+      'reported',
+      'assessing',
+      'rectifying',
+      'candidate',
+      'confirmed'
+    )
+  ),
+  add constraint profiles_uncertainty_before_range check (
+    uncertainty_before_minutes is null or uncertainty_before_minutes between 0 and 720
+  ),
+  add constraint profiles_uncertainty_after_range check (
+    uncertainty_after_minutes is null or uncertainty_after_minutes between 0 and 720
+  ),
+  add constraint profiles_rectification_confidence_range check (
+    rectification_confidence is null or rectification_confidence between 0 and 100
+  );
+
+create table if not exists public.birth_time_rectification_cases (
+  id uuid primary key default gen_random_uuid(),
+  user_id uuid not null references auth.users(id) on delete cascade,
+  status text not null default 'assessing' check (
+    status in ('assessing', 'rectifying', 'candidate', 'confirmed')
+  ),
+  reported_date date not null,
+  reported_time time without time zone,
+  reported_period text,
+  source text not null,
+  uncertainty_before_minutes integer,
+  uncertainty_after_minutes integer,
+  questionnaire jsonb not null default '{}'::jsonb check (jsonb_typeof(questionnaire) = 'object'),
+  journey_snapshot jsonb not null default '{}'::jsonb check (jsonb_typeof(journey_snapshot) = 'object'),
+  answers jsonb not null default '{}'::jsonb check (jsonb_typeof(answers) = 'object'),
+  candidate_scan jsonb not null default '{}'::jsonb check (jsonb_typeof(candidate_scan) = 'object'),
+  scoring_result jsonb not null default '{}'::jsonb check (jsonb_typeof(scoring_result) = 'object'),
+  candidate_start time without time zone,
+  candidate_end time without time zone,
+  algorithm_version text not null default 'birth-time-journey-v1',
+  ayanamsa text not null default 'lahiri',
+  node_mode text not null default 'true',
+  confirmed_time time without time zone,
+  confirmed_at timestamptz,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now()
+);
+
+alter table public.profiles
+  drop constraint if exists profiles_rectification_case_id_fkey,
+  add constraint profiles_rectification_case_id_fkey
+    foreign key (rectification_case_id)
+    references public.birth_time_rectification_cases(id)
+    on delete set null;
+
+create or replace function public.guard_birth_time_journey()
+returns trigger
+language plpgsql
+set search_path = ''
+as $$
+begin
+  if old.reported_birth_time is not null
+     and new.reported_birth_time is distinct from old.reported_birth_time then
+    raise exception 'reported_birth_time_is_immutable';
+  end if;
+
+  if new.active_birth_time is distinct from old.active_birth_time then
+    new.birth_time := new.active_birth_time;
+  elsif new.birth_time is distinct from old.birth_time then
+    new.active_birth_time := new.birth_time;
+  end if;
+
+  if new.reported_birth_time is null and new.birth_time is not null then
+    new.reported_birth_time := new.birth_time;
+  end if;
+  if new.birth_time_source is null and new.birth_time is not null then
+    new.birth_time_source := 'legacy_import';
+  end if;
+  if new.birth_time_status is null and new.active_birth_time is not null then
+    new.birth_time_status := 'confirmed';
+  end if;
+
+  return new;
+end;
+$$;
+
+drop trigger if exists profiles_guard_birth_time_journey on public.profiles;
+create trigger profiles_guard_birth_time_journey
+before update of birth_time, reported_birth_time, active_birth_time on public.profiles
+for each row execute function public.guard_birth_time_journey();
+
+alter table public.birth_time_rectification_cases enable row level security;
+
+drop policy if exists birth_time_cases_select_own on public.birth_time_rectification_cases;
+create policy birth_time_cases_select_own
+on public.birth_time_rectification_cases
+for select to authenticated
+using ((select auth.uid()) = user_id);
+
+drop policy if exists birth_time_cases_insert_own on public.birth_time_rectification_cases;
+create policy birth_time_cases_insert_own
+on public.birth_time_rectification_cases
+for insert to authenticated
+with check ((select auth.uid()) = user_id);
+
+drop policy if exists birth_time_cases_update_own on public.birth_time_rectification_cases;
+create policy birth_time_cases_update_own
+on public.birth_time_rectification_cases
+for update to authenticated
+using ((select auth.uid()) = user_id)
+with check ((select auth.uid()) = user_id);
+
+revoke all on table public.birth_time_rectification_cases from anon, authenticated, service_role;
+grant all on table public.birth_time_rectification_cases to service_role;
+grant select on table public.birth_time_rectification_cases to authenticated;
+grant insert (
+  id,
+  user_id,
+  status,
+  reported_date,
+  reported_time,
+  reported_period,
+  source,
+  uncertainty_before_minutes,
+  uncertainty_after_minutes,
+  questionnaire,
+  journey_snapshot,
+  answers,
+  candidate_scan,
+  scoring_result,
+  candidate_start,
+  candidate_end,
+  updated_at
+) on table public.birth_time_rectification_cases to authenticated;
+grant update (
+  status,
+  questionnaire,
+  journey_snapshot,
+  answers,
+  candidate_scan,
+  scoring_result,
+  candidate_start,
+  candidate_end,
+  confirmed_time,
+  confirmed_at,
+  updated_at
+) on table public.birth_time_rectification_cases to authenticated;
+
+grant update (
+  reported_birth_time,
+  active_birth_time,
+  birth_time_source,
+  birth_time_period,
+  birth_time_clue,
+  uncertainty_before_minutes,
+  uncertainty_after_minutes,
+  birth_time_status,
+  rectification_confidence,
+  rectification_case_id
+) on table public.profiles to authenticated;
+
+commit;
diff --git a/tests/test_birth_time_journey_contract.py b/tests/test_birth_time_journey_contract.py
new file mode 100644
index 00000000..6afef082
--- /dev/null
+++ b/tests/test_birth_time_journey_contract.py
@@ -0,0 +1,94 @@
+import re
+from pathlib import Path
+
+
+MIGRATION = (
+    Path(__file__).resolve().parents[1]
+    / "frontend"
+    / "supabase"
+    / "migrations"
+    / "20260717020000_birth_time_journey.sql"
+)
+
+
+def _sql() -> str:
+    return re.sub(r"\s+", " ", MIGRATION.read_text(encoding="utf-8").lower()).strip()
+
+
+def test_birth_time_profile_contract_separates_reported_and_active_times() -> None:
+    sql = _sql()
+
+    for definition in (
+        "reported_birth_time time without time zone",
+        "active_birth_time time without time zone",
+        "birth_time_source text",
+        "birth_time_period text",
+        "birth_time_clue text",
+        "uncertainty_before_minutes integer",
+        "uncertainty_after_minutes integer",
+        "birth_time_status text",
+        "rectification_confidence numeric(5, 2)",
+        "rectification_case_id uuid",
+    ):
+        assert f"add column if not exists {definition}" in sql
+
+    assert "reported_birth_time = coalesce(reported_birth_time, birth_time)" in sql
+    assert "active_birth_time = coalesce(active_birth_time, birth_time)" in sql
+    assert "birth_time_source = coalesce(birth_time_source, 'legacy_import')" in sql
+    assert "birth_time_status = coalesce(birth_time_status, 'confirmed')" in sql
+    assert "old.reported_birth_time is not null" in sql
+    assert "new.reported_birth_time is distinct from old.reported_birth_time" in sql
+    assert "raise exception 'reported_birth_time_is_immutable'" in sql
+    assert "new.birth_time := new.active_birth_time" in sql
+
+
+def test_birth_time_profile_contract_constrains_deterministic_states() -> None:
+    sql = _sql()
+
+    for value in (
+        "hospital_record",
+        "family_exact",
+        "approximate",
+        "period_only",
+        "unknown",
+        "legacy_import",
+    ):
+        assert f"'{value}'" in sql
+
+    for value in ("reported", "assessing", "rectifying", "candidate", "confirmed"):
+        assert f"'{value}'" in sql
+
+    assert "uncertainty_before_minutes between 0 and 720" in sql
+    assert "uncertainty_after_minutes between 0 and 720" in sql
+    assert "rectification_confidence between 0 and 100" in sql
+
+
+def test_rectification_cases_are_owner_scoped_and_auditable() -> None:
+    sql = _sql()
+
+    assert "create table if not exists public.birth_time_rectification_cases" in sql
+    for definition in (
+        "id uuid primary key default gen_random_uuid()",
+        "user_id uuid not null references auth.users(id) on delete cascade",
+        "questionnaire jsonb not null default '{}'::jsonb",
+        "journey_snapshot jsonb not null default '{}'::jsonb",
+        "answers jsonb not null default '{}'::jsonb",
+        "candidate_scan jsonb not null default '{}'::jsonb",
+        "scoring_result jsonb not null default '{}'::jsonb",
+        "algorithm_version text not null default 'birth-time-journey-v1'",
+        "ayanamsa text not null default 'lahiri'",
+        "node_mode text not null default 'true'",
+        "confirmed_at timestamptz",
+    ):
+        assert definition in sql
+
+    assert "alter table public.birth_time_rectification_cases enable row level security" in sql
+    assert "birth_time_cases_select_own" in sql
+    assert "birth_time_cases_insert_own" in sql
+    assert "birth_time_cases_update_own" in sql
+    assert "using ((select auth.uid()) = user_id)" in sql
+    assert "with check ((select auth.uid()) = user_id)" in sql
+    assert "grant select on table public.birth_time_rectification_cases to authenticated" in sql
+    assert "grant insert" in sql
+    assert "grant update" in sql
+    assert "grant delete" not in sql