View and rest is_new flag in transformations

Related products: Transformations and RAW

If the transformation fails/there was a bug, and it did not process some rows correctly, I often need to do a backfill. I would like an easier option to run the transformation on the full data instead of changing the variable name/manually updating the transformation.
Being able to see the value of the is_new flag and also being able to reset it would be great