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When I manage my ebooks in calibre, I want to keep track which files/formats are the original files I added to calibre and which ones are converted by calibre from the original file, to ensure that I never lose my original files.
I can recognize a book created by calibre from the creator metadata, so I want to automatically create a tag "Converted EPUB" if a .epub file created by calibre is added to my library/created by conversion (and similar tags for the other formats).
I also need a way to automatically remove the "Converted <format>" tag if the corresponding format is deleted from the database.
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