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* fix: prevent worker death during document upload by using run_coroutine_threadsafe Replace asyncio.run() with asyncio.run_coroutine_threadsafe() in save_docs_to_vector_db() to prevent uvicorn worker health check failures. The issue: asyncio.run() creates a new event loop and blocks the thread completely, preventing the worker from responding to health checks during long-running embedding operations (>5 seconds default timeout). The fix: Schedule the async embedding work on the main event loop using run_coroutine_threadsafe(). This keeps the main loop responsive to health check pings while the sync caller waits for the result. Changes: - main.py: Store main event loop reference in app.state.main_loop at startup - retrieval.py: Use run_coroutine_threadsafe() instead of asyncio.run() https://claude.ai/code/session_01UQSYvSTkXb57sFb7M85Kcw * add env var --------- Co-authored-by: Claude <noreply@anthropic.com>