Compuware AJAX edition does allow for comparisons, long term, analysis, and CI integration for a view of builds and features over time. There is a license associated with that functionality as well as linking the Browser side PurePaths all the way back to SQL..
http://apmblog.compuware.com/2012/09/11/top-performance-mistakes-when-moving-from-test-to-production-supersized-content-2/
