Same as selecting 'Settings' > 'Clean-up Database' with Subsonic web GUI
Subsonic stores information about all media files ever encountered. By cleaning up the database,
information about files that are no longer in your media collection is permanently removed.
returns True if initiated successfully, False otherwise
scanMediaFolders
Same as selecting 'Settings' > 'Scan media folders now' with Subsonic web GUI
Refreshes Subsonic media database.
returns True if initiated successfully, False otherwise
Add 2 unofficial API calls:
cleanupDatabase