(I remembered "new user" so was able to get a search to work...)
Good catch. But strictly speaking that wasn't doing development in the repl, but repairing data. The live server is the only place you can repair data on the live server.
Yep. That's the kind of thing which is fun for hn but wouldn't be a good idea at all on a financial system -- where you optimize for least bad likely worst case, not best best case.