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_school_sitemap_rows tested only the latest year's row, which quietly dropped every school with results in its history but a null row for the most recent year — a school that stopped reporting, or whose figures were suppressed for small-cohort disclosure. The Mallard Academy (150367) is the case that caught it: real KS2 results for 2015-16 through 2018-19, then null rows from 2022-23 on. Its detail page shows all four years; the sitemap omitted it. Sampling 40 of the 2,206 excluded schools found 4 like this, so roughly 220 real pages were being withheld. Publishable is now a property of the school, computed across every row, while lastmod still comes from the latest row so the most recent Ofsted date wins. The field list is a module constant shared with _has_publishable_data so the two checks cannot drift. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015mWQnpye9F299NVRCCSRvj