I've done the transformation layer in the small to keep components running during a re-write/refactor. Create a new structure and write some code (in the DB or

I've done the transformation layer in the small to keep components running during a re-write/refactor. Create a new structure and write some code (in the DB or otherwise) to make the new structure look like the old structure long enough to eventually replace that old code. I can't imagine doing that as an independent step towards a rewrite.