@carstenhaubold, @mohini1329 I have created an example where the RowID is handled and reset and applied from within the Pandas dataframe.
I think it would be good to mention the handling of the RowIDs somehwere in then Python documentation. And also one should be aware that if you copy a dataframe the index might also be resetted. So we should be careful with that.
What would be great is a Counter node that would support Long (integers) to handle very large data sets.