fix(sync): let the server own updated_at on insert for cursor-pulled tables

server/supabase/migrations/20260927000037_server_owned_sync_timestamps.sql

@@ -0,0 +1,68 @@
+-- Server-owned sync timestamps.
+--
+-- The desktop mirror (SyncEngine.pullEntity) and the audio sync read every
+-- synced table with a (updated_at, id) keyset cursor and rewind it by only a
+-- minute. That cursor is only sound when updated_at is a server clock value
+-- for every write. moddatetime already owns it on UPDATE, but an INSERT kept
+-- whatever updated_at the client sent:
+--
+-- a) a row recorded offline at T0 and pushed a day later landed behind every
+--    other desktop's cursor and was never pulled there;
+-- b) a desktop whose clock ran ahead inserted rows in the future, pushed the
+--    other desktops' cursors ahead with them, and every server-stamped edit in
+--    that window was then skipped for good;
+-- c) restore_account_portability re-inserted archived updated_at values, so a
+--    desktop that already applied the delete tombstones never got the rows
+--    back.
+--
+-- From here on the server stamps updated_at on INSERT as well. user_templates
+-- had no UPDATE stamp at all (only its RPC set it), so it gets one too. The
+-- value is now(), the same clock moddatetime uses, so INSERT and UPDATE share
+-- one cursor timeline and the existing overlap window still covers late
+-- commits.
+
+BEGIN;
+
+CREATE OR REPLACE FUNCTION public.stamp_sync_timestamp_v1()
+RETURNS trigger
+LANGUAGE plpgsql
+SET search_path = ''
+AS $$
+BEGIN
+  NEW.updated_at := pg_catalog.now();
+  RETURN NEW;
+END;
+$$;
+
+REVOKE ALL ON FUNCTION public.stamp_sync_timestamp_v1() FROM PUBLIC, anon, authenticated;
+
+DO $$
+DECLARE
+  t text;
+BEGIN
+  FOREACH t IN ARRAY ARRAY[
+    'history',
+    'dictionary',
+    'meetings',
+    'meeting_memos',
+    'meeting_documents',
+    'custom_instructions',
+    'user_templates',
+    'knowledge_documents'
+  ]
+  LOOP
+    EXECUTE format('DROP TRIGGER IF EXISTS stamp_sync_insert_v1 ON public.%I', t);
+    EXECUTE format(
+      'CREATE TRIGGER stamp_sync_insert_v1 BEFORE INSERT ON public.%I '
+      'FOR EACH ROW EXECUTE FUNCTION public.stamp_sync_timestamp_v1()',
+      t
+    );
+  END LOOP;
+END $$;
+
+DROP TRIGGER IF EXISTS stamp_sync_update_v1 ON public.user_templates;
+CREATE TRIGGER stamp_sync_update_v1
+  BEFORE UPDATE ON public.user_templates
+  FOR EACH ROW EXECUTE FUNCTION public.stamp_sync_timestamp_v1();
+
+COMMIT;