The SongKong database contains:
Details of every file loaded into SongKong
Details of changes made to songs by SongKong
Cached copies of releases and artists downloaded from MusicBrainz and Discogs
From time to time you may want to clear out the database, reasons could be:
To reclaim hard drive space
To force SongKong to retrieve new versions of data from MusicBrainz and Discogs
To delete changes history, so future Undo Fixes will only undo up to this point.
Support has requested you do this to fix a problem with the database