Querying History of Test Case Automation Engine

Hi,

I'm attempting to produce some reports to track our progress as we go about automating our test cases.

As part of this, I would like to retrieve the history of the AUTOMATION_ENGINE_NAME field of test cases.  However, changes to this do not appear to stored in SpiraTestEntities.R_HistoryDetails.  If I change that field then run the query below then there are no results listed when AUTOMATION_ENGINE_NAME is changed:

select value H from SpiraTestEntities.R_HistoryDetails as H
order by H.CHANGE_DATE desc

Is there a recommended way to query changes to the AUTOMATION_ENGINE_NAME? 

Ultimately I'd like to generate a count of cases that have had their AUTOMATION_ENGINE_NAME set, per day.