// today's reading
Mercury squares your pipeline today, Cancer. A model you've been defending through three refactors is showing data drift in production—the features that drove your baseline are degrading faster than expected. Before you blame the dataset, check your random seed consistency across training checkpoints and your most recent A/B test logs; the drift may be real, but the precision/recall trade-off in your evaluation might be masking underfitting in the new cohort.