[BUG] Scheduled notifications calculate recipients immediately #190
Description
Describe the bug
Currently when sending a scheduled notification for topics/criteria the list of recipients is computed at the time that the notification is initially scheduled. This means that anyone who subscribes to a topic/updates data to meet criteria after the initial scheduling but before the scheduled send time will not receive the notification.
Expected behavior
We should delay the calculation of the recipient list until the time when the notification is meant to be sent to ensure that all matching users are targeted.