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When you update metadata in a book, record, the database records that, writes to the OPF as a backup, just in case, and leaves the original alone. ANY time you send the book anywhere -- email, save to disk, send to device, download via calibre content server, it updates all metadata fields that the format supports in the process. If you must see that in your original copy too, Polish ebooks can manually start that process, but depending on how many books you have, it will take quite some time...
There really is no need. It never leaves calibre without the update.
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