Is the phone application source available?

I recently dusted off my Jolla 1 and updated to the latest Sailfish release. One of the reasons I had stopped using the phone was related to the call history. There is no easy way to clear the call history. I'm aware of the "commhistory-tool deleteall" command. As far as I can tell, this does not work reliably. So, since Jolla doesn't appear to have resources to add this feature to the Phone App, I'm volunteering to try. So where can I get the code? Github does not seem to have anything apart from some SDK tools.