GitHub user JackieTien97 added a comment to the discussion: Support IoTDB as 
Time Series Storage

For IoTDB, old data still remain too. For example, if we decicde use level2 to 
represent the version of the device, like `root.db.version1.d1` and we can 
write data of that device into `root.db.version1.d1(time, s1, s2, s3)`. 

If version of that device upgrades to version2, we will generate another 
device(same as influx, it will generate another new seriesKey) called 
`root.db.version2.d2`, then we can write data into this new device 
`root.db.version2.d1(time, s1, s2, s3)`.
Old data of version1 are still in `root.db.version1.d1`.

GitHub link: 
https://github.com/apache/streampipes/discussions/2857#discussioncomment-9492085

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