ProcessLog implicit fail should update the DB :status field.

[duffyjp]

The status getter is customized to return "Fail" if a process has exceeded 24 hours. The :status field remains "Started" however, so querying for failed records is not straight forward.

The 24 hour rule is arbitrary, and should probably belong in the host app's customization if anywhere.

We could write a more complex :failed scope, but the status field wouldn't be updated. A class method that does the field maintenance then executes the same where(status: 'Fail') is what I'm leaning towards.