logiclooptech.devFastAPI Session Leak Detection: How to Find and Fix Long-Running SQLAlchemy Sessions in Production?You deploy your FastAPI app.Everything looks healthy. Latency is low.Memory usage is stable.Health checks are green. Then two days later: • Database CPU spikes• Requests start timing out• Logs show QueuePool limit reached• Restarting pods “fixes” it…...3d ago·4 min read
logiclooptech.devWhy Your FastAPI App Works Locally But Fails in ProductionThe most dangerous phrase in software engineering is: “But it works on my machine.” On your laptop, everything feels perfect. Your FastAPI service runs on a MacBook with plenty of RAM, near-zero latency, and one user: you.Tests pass. Endpoints resp...5d ago·4 min read
logiclooptech.devWhy Uvicorn Health Checks Fail Under Load (And How to Fix It Properly)You deploy your FastAPI app to Kubernetes (or ECS).You configure a liveness probe on /health.Everything looks green. Then traffic spikes. Pods start restarting. CrashLoopBackOff. You check logs: No Python exceptions No OOM CPU high, but not maxed ...Feb 11·4 min read
logiclooptech.devFastAPI in Production: The Complete Deployment Guide (Docker, Workers, Scaling & Best Practices)You built a blazing-fast FastAPI service locally.Tests pass. Swagger looks clean. Latency is beautiful. Then you deploy it. And suddenly the real problems begin. Workers crash without warning.Connections exhaust.Latency spikes even though CPU looks i...Feb 6·6 min read
logiclooptech.devHow Many Uvicorn Workers Do You Actually Need? (FastAPI Performance Guide)You deploy your FastAPI app. Docker builds successfully.Health checks pass.Traffic starts flowing. Then comes the question every backend engineer eventually asks: “How many workers should I run?” Pick a number too low, and your server sits idle whi...Feb 4·5 min read
