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KS2 attainment has 1.2M rows in long format. As a view, the pivot was re-executed inline for every downstream model (intermediate → fact), causing fact_ks2_performance CREATE TABLE to run for 18+ minutes. Materializing as tables means the pivot runs once during staging, and downstream models read from a pre-computed ~16k-row result. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>