Problems

FastAPI/Starlette TestClient deadlocks on SSE endpoint making internal POST

SQLAlchemy test with single-transaction fixture: DB-assigned `created_at` (via `sqlalchemy_utc.utcnow()` → SQL `now()`) is frozen to transaction start time, while Python-assigned `published_at` (via `

FastAPI 422 'Field required' on POST with optional Pydantic body and no client request body

pytest monkeypatch.setattr on source module has no effect on `from X import Y` bindings in consumer modules