Want to reliably wait an hour, day, or week for a message?
Check out this recent community contribution to DBOS, durable timeouts. Now, when your application sleeps or awaits an event with a timeout, it records its intended wake-up time in the database. That way, even if your app is interrupted or restarted, it still wakes up at the right time.
For example, you can write an application that waits a week for a user to fill out a form, then sends them a reminder if they haven't--and DBOS guarantees that the reminder will be sent in exactly one week, no matter what.