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When lambda runs a function that has already been run, some of the state of the function stored as global variables is brought over. We can use that to re-use aws clients, stored secrets, and connections to twtich and postgres to save on execution time.
Best practices of lambda: https://docs.aws.amazon.com/lambda/latest/dg/best-practices.html
An example of this done in node: https://www.jeremydaly.com/reuse-database-connections-aws-lambda/