Workflow node history broken relationship - deleted user

The workflow_node_history table appears to be transactional in concept, but stores primarily indexes that reference other tables. Specifically, i'm talking about the 'uid' field which becomes useless when the drupal user it references is deleted.

I'm requesting a feature to store also the name / username of the user in the workflow_node_history table. Ideally a serialized value containing the login name, first name, last name and email address. But, really just a human readable name to handle the case where a user is deleted would be sufficient.

Thanks!