TudorandClaude Opus 4.8
8a9ba30cc2
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The KS2 SATs chart drew a single national-average line spanning the full height of each subject's chart area, positioned at the national *expected* value. But the area stacks two bars — Expected and Exceeding — and the higher-standard/greater-depth national is a very different, much lower figure (e.g. reading higher standard ~29% vs expected ~75%). So the line crossed the Exceeding bar at the wrong place, making every school's exceeding result look far below national when it wasn't. The per-subject higher-standard nationals were already computed in the fact_ks2_national_averages mart; they just weren't serialized. Fix: - backend: add reading_high_pct, writing_gd_pct (writing = greater depth) and maths_high_pct to the national-averages payload. - SchoolDetailView: pass a nationalExceedingPct per subject, mapping writing to the greater-depth figure. - SatsChart: replace the single full-height line with a national marker on each bar's own track (coral tick + "nat X%" in the bar header), so Expected and Exceeding each sit against the correct benchmark. KS2 only; the secondary Attainment 8 chart already uses one line for one measure and is untouched. Verified: tsc --noEmit, next build, and backend pytest (national averages marts, incl. a new test guarding the per-subject nationals). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB