Well, its complicated. There is a notification but there is “fork in the code”
At the moment I have a backfill job that does not notify and an inline job that does notify.
The job of the backfill it to fill out any holes in the badge system. Clearly we don’t want to notify every backfilled badge cause we would flood our most precious users with notifications.
So to work around this issue I will get the backfill to notify under certain conditions (badge would have been awarded in last week OR if its a silver and up badge.)
Sorry about the rough edges in the badge system, its a very complicated piece of work.