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wladdy - bit of hack - but, perhaps you put the path in a custom column ex post facto.
- You would use the calibredb set_metadata command in script of some sort.
- You'd need to devise a way to 'match' the book id with the path, a csv catalog might assist in doing that.
- And then use Bulk Metadata Edit->Search and Result to extract values out of the custom column into target columns - eg author, series, publisher etc -
- You might be able to do all of the above in the calibredb set_metadata script - depends on the folder tree, and your scripting proficiency.
An alternative might be use an advanced file renamer to pre/ap-pend the folder path into the format file names and use a suitable template in Add Books to pull it apart into relevant metadata columns.
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eschwartz - seems that the oft discussed 'feature' to inject the original path into a custom column on adding a book would be useful here.
BR