Queued Notifications table should have a notifications_id column

I am currently debugging an issue in regards some emails not being sent.

sent_time appears NULL for  many of the queuednotifications entries and they seem  to stay like that.

For debugging and reporting purposes,I think that  the queued notifications table should also contain the notifications_id information as currently is very hard to know which notification type generated the queued entry.

I think that notifications_id would be more important that notification_template, because we can find out the template from notifications_id but not the other way around.