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Originally Posted by BetterRed
Would that mean every item listed in the Manage categories tool would have a link field similar to Authors, viz?
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Yes
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I thought adding columns to calibre's database tables was off-limits because of the potential impact on the databases in the wild.
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As Kovid mentioned, there have been many. With my change we are up to version 26.
There are always risks when changing the schema because reverting to a previous calibre release (before the change) might not work. I don't think this change will do that, but it might.
In addition, anyone who reads the upgraded tables using SELECT * expecting to get the old number of values will have problems. As I said when I taught a database course way-back-when, don't do that. Always select only the columns you need.