📝 Use FastAPI lifespan instead of startup event #1687
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Replace deprecated FastAPI startup events in tutorial examples with lifespan context managers, keeping on_startup() as a helper for tests and documentation consistency.
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This updates the FastAPI tutorial examples to use the modern
FastAPI lifespan API instead of the deprecated startup event.
The
on_startup()function is intentionally kept as a plain helperand reused by the lifespan context manager, so that existing tutorial
tests can continue to call it directly without relying on the ASGI
lifecycle.
No behavioral changes are introduced, and all tests pass.