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perf: denormalize content-warning filter to manga_content_warnings

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The content-warning include/exclude filter (and its count) ran a correlated
page_content_warnings->pages->chapters join per candidate manga — O(mangas *
pages) on every filtered list. Add a manga_content_warnings(manga_id, warning)
table holding each manga's deduped warning union, maintained by triggers that
recompute an affected manga's set (delete+reinsert of the tiny five-label set,
robust across page/chapter/manga cascade deletes), backfilled in the migration.
The filter is now a single indexed lookup.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-07-11 14:24:31 +02:00
parent d749b56d58
commit c11df3182c
6 changed files with 150 additions and 11 deletions
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12
backend/src/repo/manga.rs
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@@ -144,17 +144,13 @@ const FILTER_WHERE: &str = r#"
AND NOT EXISTS (
SELECT 1 FROM unnest($6::text[]) AS req(w)
WHERE NOT EXISTS (
SELECT 1 FROM page_content_warnings pw
JOIN pages p ON p.id = pw.page_id
JOIN chapters c ON c.id = p.chapter_id
WHERE c.manga_id = mangas.id AND pw.warning = req.w
SELECT 1 FROM manga_content_warnings mcw
WHERE mcw.manga_id = mangas.id AND mcw.warning = req.w
)
)
AND NOT EXISTS (
SELECT 1 FROM page_content_warnings pw
JOIN pages p ON p.id = pw.page_id
JOIN chapters c ON c.id = p.chapter_id
WHERE c.manga_id = mangas.id AND pw.warning = ANY($7::text[])
SELECT 1 FROM manga_content_warnings mcw
WHERE mcw.manga_id = mangas.id AND mcw.warning = ANY($7::text[])
)
"#;