The Dataset That Said It Changed Every Day

Our rejection statistics page, The Bar, describes itself twice. Readers see the page. Machines also read a structured description of the dataset behind it, the kind search engines and AI systems use to decide what a page contains and how fresh it is.

That machine description stamped itself as revised today, every day, on every load. Nobody revised the data daily. The stamp was the current date written at render time, so a crawler arriving on any morning was told the dataset had changed that morning.

The visible page was already honest. Its recount line prints the real date the numbers last moved, and that date comes from the counting machinery itself. Only the invisible layer claimed more than it had.

We found it while fixing a neighboring defect in the same session: the dates our sitemap reports to crawlers had the opposite problem, standing still while pages changed. Reading every date on that path surfaced this one, moving without cause.

The rule that fixed it is the one our numbers hub already follows: the newest date we can prove, or nothing. The dataset description now carries the same recount date the page prints, and when no real stamp can be read it carries no date at all. An absent date is honest. An invented one is not.

No reader saw a false date on the page. Machines did, and machines quote us. That is why this correction is published rather than quietly shipped.