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Putting key back in the key-DB to be reused

After removing an expired link, we can put the key back in the key-DB to be reused.

does it make sense to reuse keys? they a link that someone created could suddenly redirect to some other url.

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Agreed, shortened URL retrieved from old content (forum posts via archives, old tweet or anything else), would now point to something different from the original link. Whoever stumble upon that link would have no way to know it is not the original content they are looking for.
IMO an error message saying the link has expired is better, but then why would the links expire in the first place if we don’t overwrite them?

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