Merging to sites/I'd's? (no replies)

I am using piwik with Wordpress integration and reports are working.
But one day the data mining didn't work anymore, maybe from changing users password and new api key. Now I have two site ID's in the back office for one site. The old one till change and the new one since change. So my reports won't show the full time/year development.
Is it possible to merge both site ID's for a continuing reporting?
Best
Stefan