Short answer is don't - I had to pump some Prod data through a backend travel booking system years back, and unknown to me the CEO was using the dev backend and

Short answer is don't - I had to pump some Prod data through a backend travel booking system years back, and unknown to me the CEO was using the dev backend and UI to demo to investors. It didn't look too secure when his demo started populating with real email addresses. If you've really got to do it, write a script that emulates prod data with fake made up examples.