Database compression is also working here. Thanks for the speedy fix.
For churn, my calibre Intake library might suffer from churn, my calibre Main library has relatively few changes done to it but neither of those have anything to do with the Kobo database compression. From my notes, the maximum compression was when I copied my entire library to my Clara HD (it's storage was updated to 124GB) and the database grew to over 1GB. At that point compressing the database did not show any size change. I then deleted 14,000 books and the database resized to about 230MB after the vacuum operation.
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