How does lifecycle differ for global vs path operation dependencies?

WHAT IT TESTS: Whether you know FastAPI dependencies resolve per-request and that scoping matters for expensive work. ANSWER OUTLINE: First, both run per-request, but a global dep runs for every request to any endpoint while a path-local dep runs only for that route. Second, expensive setup inside a dependency blocks the request, so heavy work belongs in a lifespan event or cached module singleton, with the dependency acting as a lightweight accessor. RED FLAG: Claiming global deps run once at startup or are cached across requests.