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The restore_database command requires that the book files are still physically in the library. Are they? Use the file explorer for your system and go to the folder/directory that contained calibre's library. You should see a bunch of folders named for authors. Inside those folders should be more folders named for titles. Inside these second-level folders should be various files. Do you have these?
If the files aren't there, then unless you have a backup of your library somewhere, you are out of luck.
If the files are there, then is there a file named metadata.db in the same folder as the one containing all the authors' names?
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