Reduce number of concurrent jobs in namespace
the idea is to reduce the number of pending jobs, currently we have > 200,000 jobs, from a lot of different datasets.

And as it seems like a cause of the issues with the queue is that concurrent backfill processes run at the same time for the same dataset, we reduce the concurrency drastically to 1 job per namespace (we don't have a way to limit per dataset, for now)
Reduce number of concurrent jobs in namespace: the idea is to reduce the number of pending jobs, currently we have > 200,000 jobs, from a lot of different datasets.

And as it seems like a cause of the issues with the queue is that concurrent backfill processes run at the same time for the same dataset, we reduce the concurrency drastically to 1 job per namespace (we don't have a way to limit per dataset, for now)