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- Graceful shutdown: SIGTERM/SIGINT handlers drain HTTP, stop workers, close DB - Thumbnail caching: disk-cached thumbnails with immutable Cache-Control headers - Worker thread pool: Piscina offloads Sharp processing off the main event loop - Persistent Python dispatcher: pre-imports ML libraries, eliminates cold-start latency - Tool page registry: declarative tool-to-component mapping replaces 750-line switch - File store cleanup: remove dead derived fields, stable files array reference - Job persistence: progress written to SQLite jobs table, stale jobs recovered on startup