Restoring from the recycle bin only puts the file back in its original folder. It does not add the entry back to the database. As far as Calibre is concerned, it's now just an extra file in the data folder that shouldn't be there.
There's a rebuild library feature that might work (I've never used it myself) but I would recommend moving the folder containing the book file out of the Calibre library folder and re-adding it as a new book through the Calibre interface. That's probably your fastest way to get it back, since you wouldn't have to run a process that affects your entire library.
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