- Celery workers use NullPool to avoid "Future attached to a different
loop" errors from stale pooled async connections across asyncio.run()
calls. FastAPI keeps regular pool (single event loop, safe to reuse).
- Skip pgvector similarity search when no conversation history exists
(first message) — saves ~3s embedding + query overhead.
- Wrap pgvector retrieval in try/except to prevent DB errors from
blocking the LLM response.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adolfo Delorenzo
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