- part_scraper_service.ts: new CACHE_TTL_HOURS (24), isCategoryStale() checks the most recent scrapedAt for a given ComponentType's mapped category, ensureFreshCategory() re-scrapes it synchronously if missing or stale (errors are logged, not thrown, so search still falls back to whatever is already cached) - ScrapedPartsController#index: when a typeId filter is provided, the corresponding category cache is refreshed eagerly if stale before querying results. Free-text searches without a typeId skip this to avoid re-scraping every mapped category on every keystroke - 'node ace scrape:parts' still refreshes everything at once on demand - 4 new tests covering staleness detection (missing cache, <24h, >24h) and that unmapped types never trigger a scrape/network call