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Clearing all recents of a given content type fired N concurrent IPC calls, each opening its own implicit transaction in the recently_viewed table. For users with hundreds of recently-watched VOD/series rows this added real overhead even though the UI updates optimistically. Add a new DB_REMOVE_RECENT_ITEMS_BATCH path end-to-end: - removeRecentItemsBatch() Drizzle op: one transaction, one prepared statement reused per row - Wire through worker → IPC handler → preload → window.electron typings → DatabaseService - UnifiedRecentDataService.removeRecentItemsBatch() groups items by source. Xtream items go through the new batch IPC. M3U/Stalker items still go per-playlist because they update a JSON column on the playlist row, not the recently_viewed table — but they now run in parallel with the Xtream batch via a single Promise.all. - Single call site updated: unified-collection-page "Clear all of type" confirmation handler. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> Entire-Checkpoint: 4bfb62f988b7