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Your SQLAlchemy test factory fails at random past 50 rows. Here's the one-line fix.

You write a test that seeds a hundred rows with a factory. It fails with IntegrityError: UNIQUE constraint failed: users.id . You run it again and i…

pythonsqlalchemypytesttesting
Dev.to Sep 27, 2026, 19:04 UTC
EN

📝 Ending Product Sales Without Breaking Sales History — Implementing Soft Deletes and Reducing Gemini API Usage in Flask

🍞 Introduction Hello from Japan! 🇯🇵 This article was originally published in Japanese on Qiita and has been translated and adapted for DEV Community…

pythonflaskpostgressqlalchemy
Dev.to Aug 2, 2026, 13:05 UTC
EN

Deep Dive: Resolving Asyncio Deadlocks and Memory Leaks in Python SQLAlchemy

The Hidden Traps of Asyncio + ORM in High-Concurrency Python Moving from synchronous Python to asyncio is a massive win for I/O-bound applications.…

pythonsqlalchemy
Dev.to Jun 9, 2026, 03:58 UTC
EN

Testing FastAPI + SQLAlchemy with Real PostgreSQL Fixtures: No More Mocking Misery

Testing FastAPI + SQLAlchemy with Real PostgreSQL Fixtures: No More Mocking Misery I spent three months debugging why a query worked in tests but fa…

fastapisqlalchemypostgrestesting
Dev.to May 23, 2026, 09:12 UTC

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