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What is the difference between "event_time" and "datetime"?

event_time is the timestamp that the Ardexa Agent picked up the given message and will always be UTC.  event_time is present for all records in the Ardexa system.

On some devices monitored by the Ardexa Agent, instead of giving a raw reading when a request is made, they will provide a list of cached readings.  This is where datetime is used.  datetime is when the device being monitored took a reading, and event_time is when the Ardexa Agent picked up that reading for transmission to the cloud.

Therefore, where available, datetime is the actual time the measurement was taken.

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