One number, four answers: reconciling four divergent hit-rate pipelines over 46,139 settled predictions

<p>Every analytics platform eventually ships a number nobody can trace. Ours was the hit rate. It appeared in four places — the model table, the leaderboard, the per-competition rollup, the daily stats cron — and they disagreed by as much as 17 percentage points on the same model, on the same day, reading the same database. This is that story, with the numbers. Every figure below is the output of

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