* Allow the system user to update job columns, even if the job is "locked"

* Allow the system user to update job columns, even if the job is "locked"
* Once the job process completes, automatically mark "job.running = false" and set "job.finished_at" if not set
* Exclude jobs from the queue where the "success" field is already set
* Consider a pipeline to be failed if any of the component jobs are marked as failed