Programmatically adding custom columns
What is the interface to add custom columns? (stand-alone program run via "calibre-debug")
Background:
I'm trying to programmatically prepare and populate a full library and I have several non-standard info to handle.
If I understand it correctly I can stick arbitrary data to Metadata instances before I call "db.add_books(my_list)", but, in order for this to work the custom columns should already exist.
I would like to avoid creating them manually in the UI.
TiA!
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