History Layer There are 5 access data layers introduced in my elder post Building Sensor Network: with BigClown: Current, History, Integration, Machine Learning, Reporting. And we have already utilized the first one and the last one in the post IoT Doorbell: with BigClown. Now it is the time to look into the History layer.
Time series database Storing, maintaining and accessing historical data is always expensive, so it is worth spending some time on finding the most effective way how to cope with that.
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