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Validic captures a maximum of 7 30 days of Dexcom historical data. This would be the 7 30 days prior to the Dexcom user first syncing to Validic. While Dexcom may be able to have more than 7 30 days of historical data, Validic chose to only pull in 7 30 days due to the sheer volume of intraday data that would have to be captured, stored, and then made available in the Inform API.
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If a patient fully disconnects Dexcom from their Validic user and then reconnects that same user within 7 30 days, it is highly likely that the data pulled in upon reconnection will contact duplicate data that you have already received. Normally you would use the Validic "id" and "checksum" to check for data you may have already consumed. This will not work for the Dexcom CGM data. You would want to check the "time" and "value" pairs of the records to check for possible duplicates.
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