Event when batch done?

[svdo]

Now that we have implemented batches of jobs, we were wondering what your thoughts are about adding some sort of "done" event. In other words, yoltq being able to notify you when all jobs belonging to a certain batch are done, i.e. no longer in progress but either finished or errored. Given the multi-threaded nature of yoltq, how do you feel this could/should be implemented? Do you think this is a good idea in the first place? Thank you!