fix(rectification): bind default session model

frontend/supabase/migrations/20260811040000_rectification_session_default_model.sql

@@ -0,0 +1,49 @@
+begin;
+
+create or replace function public.default_rectification_chat_session_model()
+returns trigger
+language plpgsql
+security definer
+set search_path = ''
+as $$
+begin
+  if new.session_type = 'birth_time_rectification' and new.model_id is null then
+    select c.model_id into new.model_id
+    from public.model_config_versions v
+    join public.model_configs c on c.id = v.config_id
+    join public.model_providers p on p.id = v.provider_id
+    where v.status = 'published'
+      and v.enabled
+      and v.is_default
+      and p.enabled
+    limit 1;
+  end if;
+  return new;
+end
+$$;
+
+revoke all on function public.default_rectification_chat_session_model() from public, anon, authenticated;
+
+drop trigger if exists chat_sessions_default_rectification_model on public.chat_sessions;
+create trigger chat_sessions_default_rectification_model
+before insert or update of session_type, model_id on public.chat_sessions
+for each row execute function public.default_rectification_chat_session_model();
+
+with default_model as (
+  select c.model_id
+  from public.model_config_versions v
+  join public.model_configs c on c.id = v.config_id
+  join public.model_providers p on p.id = v.provider_id
+  where v.status = 'published'
+    and v.enabled
+    and v.is_default
+    and p.enabled
+  limit 1
+)
+update public.chat_sessions s
+set model_id = default_model.model_id
+from default_model
+where s.session_type = 'birth_time_rectification'
+  and s.model_id is null;
+
+commit;

frontend/tests/rectification-v9-database.test.ts

@@ -101,6 +101,23 @@ test("v9 open is atomic, idempotent and resumes instead of duplicating", { skip:
       where id = '${userId}';
     `);
 
+    fixture.psql(`
+      with provider as (
+        insert into public.model_providers (code, name, provider_type, encrypted_api_key, enabled)
+        values ('v9-test', 'V9 Test', 'openai', 'test-ciphertext', true)
+        returning id
+      ), config as (
+        insert into public.model_configs (model_id)
+        values ('v9-default-model')
+        returning id
+      )
+      insert into public.model_config_versions (
+        config_id, version, provider_id, label, provider_model, enabled, is_default, status, published_at
+      )
+      select config.id, 1, provider.id, 'V9 Default', 'gpt-test', true, true, 'published', now()
+      from config cross join provider;
+    `);
+
     const service = createLocalPostgresDataClient(
       fixture.connectionUrl("service_runtime", "service-runtime-test-password"),
       null,
@@ -134,6 +151,10 @@ test("v9 open is atomic, idempotent and resumes instead of duplicating", { skip:
       fixture.psql(`select count(*) from public.chat_sessions where user_id = '${userId}'`),
       "1",
     );
+    assert.equal(
+      fixture.psql(`select model_id || ':' || model_config_version from public.chat_sessions where id = '${sessionId}'`),
+      "v9-default-model:1",
+    );
     assert.equal(
       fixture.psql(
         `select count(*) from public.agentic_rectification_open_ledger where user_id = '${userId}'`,