Sounds like a pretty great idea, executing queries on production is a necessary but scary flow below a certain company size, until you can afford to be slow about it.

Got a question: presumably this adds a trigger, that adds some amount of extra work to every query, achieving a benefit for the relatively negligible number of manual queries. Makes me wonder about the performance impact of that trigger?

An article about some performance characteristics in the docs would help a lot to assuage that concern.