Given that there are a limited number of aggregation levels available for reporting, one alternative would be to use the GUI to schedule a daily report for each aggregation level of the previous day's data and have that report automatically emailed to you. Then all you have to do is to process the incoming data files (which are CSV btw, so they process a lot faster than the XML reports from the API), and store the data. When your client does his queries and selects his options, you don't have to get the data from Google - you just query your local database. The cost is zero because there are no API calls. This also solves the ongoing problem of not knowing when it is safe to pull the previous day's data from Google via the API, since the report is a push report and Google is determining when to send it to you.
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