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This PR adds a configurable option for a registration rate limiter. It does not include any rate limits for registration.
It updates some of the config files. Let me know if that's unwanted, happy to pull it out.
Why?
Most developers would reach for recaptcha/etc for their registration protection needs, but I'm doing something that cannot make external service calls.
The next best option seems to be a rate limiter based on the MaxMind database's ASN information. But there's no nice way to add a limiter to the registration route right now!