Is it possible to query from a workflow the table "nms:broadLogUser"?
I managed to send an email to a user and that schema seems to be containing those specific broadlogs (see the OOB target mapping 'mapUser', into the storage section).
Is it possible to create a dedicated schema for the tracking? I cannot see an OOB tracking schema for Users.
You will not be able to see broadLog resource: it is private resource.
You can find any delivery related data in a workflow by using Profile as your resource.
You can use Query activity and defint filter something like this: