fix(stargifts): sync correct channel gift notifications

deploy/migrations/0150_channel_star_gift_notifications.down.sql

@@ -0,0 +1,9 @@
+DELETE FROM star_gift_user_message_refs refs
+USING peer_star_gifts gift
+WHERE gift.id = refs.saved_gift_id
+  AND gift.owner_peer_type = 'channel';
+
+COMMENT ON TABLE star_gift_user_message_refs IS
+    'Owner-local private service-message aliases to user-owned saved gift aggregates.';
+
+DROP TABLE IF EXISTS star_gift_channel_notification_jobs;