Use updatedAt instead of overwriting createdAt

[zackrw]

I noticed the existing approach updates createdAt with each vercel KV payload:

So I updated it to only set createdAt if the record doesn't exist yet:

(Coincidentally both values end in 902 here 🙂)

I didn't figure out how to do this in a single request, but that would be even better. I also added explicit types to get TS and Redis onboard with adding createdAt to the payload conditionally.

The other change I am suggesting is moving from hmset to hset. I think the behavior is the same but Redis says hmset is deprecated: https://redis.io/commands/hmset/ ... I may be missing something if that is intentional though.

[vercel]

@zackrw is attempting to deploy a commit to the Vercel Team on Vercel.

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