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Run the Python cron job every five minutes. It checks the condition of all data sources. You don't need a server to do this, you can run this from your house!

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Maybe, but I guess I don't see why you're so worried about it. It works and it costs less to run than it would cost in electricity if he were running it from his house.

They are worried about it because they are tired of being sold bullshit.

(That is what I am inferring from their messages, not necessarily my own opinion)

The Lambda method seems like a more complex and unreasonable way to solve the problem. It's like using a hammer to tie your shoes.

This can literally run from his laptop whenever it's online. You don't need a fully fledged server to do this.

He doesn't have a "fully fledged server". He's sharing some servers with tens of thousands of other people. It's literally less hardware investment then a RPi let alone a laptop, and it's priced accordingly. And it runs even when his home computer isn't powered on or online.

That's like saying "I use this hammer to tie my shoes and it's good because now I have a hammer."

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