That is just for overriding the location of metadata.db -- it was in the original script so I left it in. Unless you create it it is ignored, so why not?
It allows you to store the metadata.db on the local HDD/SSD for faster performance.
http://manual.calibre-ebook.com/cust...ment-variables
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CALIBRE_OVERRIDE_DATABASE_PATH - allows you to specify the full path to metadata.db. Using this variable you can have metadata.db be in a location other than the library folder. Useful if your library folder is on a networked drive that does not support file locking.
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