Getting number of processed messages of all productions

Hi!

Is there any simple way to query data about processed messages in all Ensemble productions?
What I ultimately would like to do is to periodically export that data to another system and run statistics on it.

I've been digging around in the SQL tables view and Ens.MessageHeader seems to contain most of what I'm after.
Using ODBC I could access that table view and query data, but only for one namespace per DSN it seems.

Can Ens.MessageHeader from different namespaces be mapped into a single namespace so that it can be accessed with ODBC?
Or is there a better way to access this data than to use the ODBC interface?

Thanks
Andreas