Optimize `upload_visit_images` by offloading I/O while preserving thread safety and security#714

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jules-1540687093843833633-3d8ca3aa

Commits on Apr 30, 2026

perf(backend): optimize upload_visit_images to use threadpool safely\n\n- Offloaded synchronous file I/O writes to the threadpool via `save_images`.\n- Preserved SQLAlchemy thread safety by keeping…
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