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Hi Alex: 1. We actually read the data from BigQuery and store a copy of the aggregate results. The way the data gets into BigQuery is up to you- but if you’re using our SDKs we have a

trackingCallback

method you can call. 2. The reason we ask for the event tracking first is that we can pre-populate the queries used. You can always change it at any point. (some of the schemas from some of the systems are complex)