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优化

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truewhile
2026-09-03 16:53:12 +08:00
parent 4150d03852
commit c702a68cfb
24 changed files with 691 additions and 168 deletions
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internal/database/schema_migration.go
+9 -1
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@@ -60,8 +60,16 @@ func ensurePostgresColumnCompatibility(db *gorm.DB) error {
func ensurePerformanceIndexes(db *gorm.DB) error {
statements := []string{
// 完整多级排序索引：媒体库分页与首页预览的 ORDER BY
// (release_date, year, updated_at, created_at, id) DESC 与索引列完全一致，
// LIMIT 分页沿索引顺序直取，免去对整库行做临时 B-tree 排序。
`CREATE INDEX IF NOT EXISTS idx_media_library_recent_active ON media(library_id, release_date DESC, year DESC, updated_at DESC, created_at DESC, id DESC) WHERE deleted_at IS NULL`,
// 计数覆盖索引：首页 CountByLibraries 的 GROUP BY library_id + nsfw 谓词
// 全部落在索引键/部分索引条件上，纯索引扫描即可完成，不回表。
`CREATE INDEX IF NOT EXISTS idx_media_library_nsfw_active ON media(library_id, nsfw) WHERE deleted_at IS NULL`,
// 旧的两键前缀索引被上面的完整排序索引完全覆盖，删除以降低写放大。
`DROP INDEX IF EXISTS idx_media_library_release_active`,
`CREATE INDEX IF NOT EXISTS idx_media_library_created_active ON media(library_id, created_at DESC) WHERE deleted_at IS NULL`,
`CREATE INDEX IF NOT EXISTS idx_media_library_release_active ON media(library_id, release_date DESC, year DESC) WHERE deleted_at IS NULL`,
`CREATE INDEX IF NOT EXISTS idx_media_library_episode_active ON media(library_id, season_num, episode_num, created_at DESC) WHERE deleted_at IS NULL`,
`CREATE INDEX IF NOT EXISTS idx_media_library_root_active ON media(library_id, library_root_id) WHERE deleted_at IS NULL`,
`CREATE INDEX IF NOT EXISTS idx_media_series_active ON media(series_id, season_num, episode_num) WHERE deleted_at IS NULL`,