Audiobookshelf
When enabled, search results will be checked against Audiobookshelf and marked as downloaded if found to avoid duplicate requests. Will likely make search and recommendations slower as they are checked against ABS.
Note: This feature either checks if the ASIN has been added to the metadata of a book in ABS, or else it performs a best-effort matching of the book title and author. It may therefore miss some books that are already downloaded.