A better way to do this type of thing on the endpoint would be to use the client compliance API and just query on the state of an action.
See: https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/Tivoli%20Endpoint%20Manager/page/Client%20Compliance%20API for some information on the API and see if it would work for you.
The information is in the ActionHistory.db file yes, but the form of it can change between releases and to be honest explaining that wonderful status string (which is the same as a report generates) is pretty tough.