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A series is a unique data source you are measuring. For example, if you are measuring four temperature sensors, that's four series (imagine data streaming from the source).
A data point is a unique reading in a series (ie. a timestamp, value pair). If you are sampling a temperature sensor once per minute, you will have 1440 data points/day for that series.
(1 sample/min * 60 mins * 24 hours = 1440 data points/day)
Your total storage is a function of the number of series you are measuring, how often you sample them, and how long you'd like to keep the data. For example, if you are measuring ten series at a sample rate of once per minute, you will create roughly 432,000 new data points per month.
(1 sample/min * 60mins * 24 hours * 30 days * 10 series = 432,000 data points/month)
It costs $1 for every 1 million total data points in storage per month. The Production database plan includes 100 million data points, so you won't receive additional charges until you store more than 100 million data points.
Your data points are stored forever. However, since TempoDB charges for total data points stored, you may wish to archive or downsample your older data. TempoDB fully supports this and provides tools to help you manage your data storage.
You can stop using TempoDB at any time and have all of your data exported in CSV, JSON, or SQL format.