@mdo if lean is your goal, I would be looking at using a DBMS that is exposed as a Rest Web Service and using a Service Task and the HTTP-Connector to push data into your Database.
Here is a simple example that lets you build your data model through a UI: http://deployd.com
In just a few minutes you can deploy a Process that captures data through an Embedded Form and push the data through REST into your Database.
few links for reference: