Imagine a system that could do this in CI/CD pipelines:

1) first, run all the tests on a tiny DB as usual 2) extract queries 3) run them against full-size DB branch/thin clone (thin provisioning, CoW; PII is not there of course, wiped out for security/compliance) -- auto-guessing parms, that's the trickiest part, but assume it's solved 4) collect all the details about performance, focusing on IO numbers (rows, block read/writes) 5) if some queries are off – say, you forgot LIMIT – post a warning, block the change, do not allow deploying it, letting backend dev fix it.

This would be proactive. And it's becoming possible with modern tools.