Calibre has a 'Restore recently deleted' (AKA trash can) feature.
The deleted epubs are in a '.caltrash' directory in the library. They'll automatically be purged after a configurable number of days (14 by default?). I assume only if Calibre is running. (And if that library is open?)
If you invoke the 'Remove books' > 'Restore recently deleted' action, there's a 'Clear' button on the dialog to empty the trash immediately. You can also set the 'number of days' to 'on close'.
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