# Celery Is Overkill: When to Use Redis Pub/Sub Instead Last month a client’s order‑processing pipeline started queuing **12 k jobs per minute** and the Celery workers began to stall, spilling un‑acked tasks into the broker and eventually crashing the whole service. The fix was only four lines of
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# Pydantic v2 Migration: What Actually Breaks and How to Fix It Fast Every Pydantic v2 migration I’ve seen in production has the same hidden bug: **stale validator caches** that silently corrupt data while the test suite stays green. The code looks fine, the API returns 200, but under load the pa
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# OpenTelemetry for FastAPI: Tracing Across Services Without the Overhead Nobody Warns You About Last month a client’s order‑service started timing out under a 5 k RPS load test. The stack trace showed a mysterious 150 ms pause inside the request handler – nothing in the business code changed. Af
