Shipped an internal API cost dashboard for our team

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One page showing what each service spent yesterday.

We were surprised by a bill, then spent a week working out which service caused it. Now every call is tagged with a service name and the dashboard shows cost per service per day, with a line for the seven-day average.

Cursor wrote the ingestion and the charts. The real work was the tagging, because two services shared a key and there was no way to split them after the fact. We had to rotate keys before any of the numbers meant anything.