While we are a bit on this topic: is there a alternative to calibre [1] for managing a shitload (50000+) of ebooks which is still performant? Specially ebooks w

While we are a bit on this topic: is there a alternative to calibre [1] for managing a shitload (50000+) of ebooks which is still performant? Specially ebooks which have no ISBN (PDF, whitepapers, etc) which only information about them is in their EXIF file data. [1] https://calibre-ebook.com https://calibre-ebook.com