Also, I changed from a separate file to a single line R script because it is difficult to determine the location of the R script to execute it when the module will be shipped as a package or run in production.

You got your wish by inlining the R call inside of Python.

Yes, for history I do not believe we have an easy answer for SWH (and the world at large) to consume. We may have approximations; I'll check with Gabor and others.

Nicholas: Sadly, one can't. I kinda/sorta have that implicitly as I have been running CRANberries since 2007 or so.