fastapi @app.on_event decorator is deprecated

The deprecation warning for the on_event method in FastAPI suggests that it's better to use lifespan event handlers. FastAPI has introduced a more standardized way to handle startup and shutdown events using the lifespan context, which provides a cleaner and more consistent approach
The method "on_event" in class "FastAPI" is deprecated
on_event is deprecated, use lifespan event handlers instead.

Read more about it in the
Lifespan Context Manager: The lifespan function is now used as a context manager where you can place the code for both startup and shutdown events. It yields control back to the application in between the startup and shutdown.
More Flexible: This method is more flexible and aligns with Python's native context management patterns, making it easier to manage resources.
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