Remove Depends(get_session) from POST /metadata/reindex endpoint to prevent database connections from being held during N embedding API calls.
This endpoint is CRITICAL as it loops through ALL knowledge bases and calls embed_knowledge_base_metadata() for each one. With the original code, a single connection would be held for the entire duration (potentially minutes for large deployments), completely exhausting the pool.
The Knowledges.get_knowledge_bases() function manages its own short-lived session, releasing the connection before the embedding loop begins.
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