23 lines
792 B
SQL
23 lines
792 B
SQL
-- Denormalized "last aired episode date" on media_items. Maintained by
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-- the episode upsert path. Replaces the per-row correlated subquery in
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-- catalog/air_date_sql.go (audit 2026-05-01 §2.1, hot path #1).
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ALTER TABLE public.media_items
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ADD COLUMN IF NOT EXISTS last_air_date_at date;
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-- Backfill from existing episodes.
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UPDATE public.media_items mi
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SET last_air_date_at = sub.last_aired
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FROM (
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SELECT e.series_id, MAX(e.air_date) AS last_aired
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FROM public.episodes e
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WHERE e.air_date IS NOT NULL AND e.air_date <= CURRENT_DATE
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GROUP BY e.series_id
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) sub
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WHERE mi.content_id = sub.series_id
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AND mi.type = 'series';
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CREATE INDEX IF NOT EXISTS idx_media_items_last_air_date_at
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ON public.media_items USING btree (last_air_date_at DESC NULLS LAST)
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WHERE type = 'series';
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