That is a bit of a drastic solution! You have deleted the database that Calibre uses to store all it's metadata and to track what books are in it's library. However if it was so badly corrupted that it was stopping Calibre from loading I guess it might have been the only way forward.
There is an option in Calibre under Library->Library Maintenance that can rebuild the library database from the underlying files stored in the Calibre library folder.
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