"As a Client Developer, I want to know how many API calls I made during a particular period, so I can plan for the future."

We've got a visualization in the Developer Portal prototype. The Dev Portal is implemented with MediaWiki within our network, and could have access to a global data store. Doesn't need to be exact logs, just number of calls in the time period. Currently the period (hours? days?) and number of calls per period (50? 500,000) is unspecified. Reasonable to only keep these logs for 90 days, like other private (?) data.