> select * from subscriptions where account_id=28;
id | callback_url | secret | expires_at | confirmed | account_id | created_at | updated_at | last_successful_delivery_at | domain
----+--------------+--------+------------+-----------+------------+------------+------------+-----------------------------+--------
(0 rows)
あれれ？
@zundan account_id は、購読なのであなたのIDです。