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The lambda doesn't have a schedule within because doing so would split the concerns poorly; rather you would hit this lambda on your own schedule.

Ah, so you ping the lambda to have it ping the coded in website?

.. as a service!

Or you could invoke the lambda on a schedule using Cloudwatch

Yup! Didn't want to include the TF to do the scheduling (for simplicity) but I could add it if people want.