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⚡ Bolt: Graph Entity Similarity Performance #483

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⚡ Bolt: Graph Entity Similarity Performance #483

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## 2024-05-23 - Synchronous Audit Logging Bottleneck
**Learning:** `ToolOrchestrator._audit_action` was performing synchronous file I/O (open/write/close) for every tool invocation. This introduced ~68ms latency per 1000 calls. Moving this to a background thread with `queue.Queue` reduced it to ~3ms (20x improvement).
**Action:** For high-frequency logging or audit trails, always use an asynchronous writer or background thread to decouple I/O latency from the main execution path.
## 2024-05-18 - Optimize GraphManager entity similarity
**Learning:** N+1 queries in SQLAlchemy async tasks severely degrade performance, especially when checking relationships for all entities. Using Common Table Expressions (CTEs) to perform intersections and group counts in a single SQL query avoids retrieving large quantities of data back to the application layer.
**Action:** Prioritize batching or joining data directly in SQL using CTEs instead of iterating over returned rows and executing individual queries for each entity comparison.
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