This endpoint allows adding a set of users defined by
args.drillConditions to existing transactional message of _id specified in
Note that existing notification must be active (or Scheduled in dashboard,
result.status & 2 > 0) and transactional (
tx === true).
Users are added to the queue right away, meaning scheduling part is done during request processing, not in a detached job way as in
Returned object shows how much push notifications has been added to the sending queue (
total) as well as closest date on which they'll start being sent (