WorkflowPuger does not purge terminated Workflow

[digitalsigi]

Describe the bug I am using WorkflowPurger to cleanup old workflow persisted entries. Works fine as long as the have a CompletedTime. This seems to be not the case for WF with Status Terminated (3). I am using EF 5 and the default provider for it.

To Reproduce Steps to reproduce the behavior: Terminate Workflow with Exception and have .OnError(Terminate) in the Workflow definition.

Expected behavior I should be possible to purge a terminated Workflow with CompletedTime == null

Additional context Simple Suggestion: Allow a nullable datetime in Method PurgeWorkflows.