_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
