On Windows, iReal Pro keeps automatic Library Snapshots, so you can roll your whole library back to an earlier state.

 

Restoring a snapshot overwrites the current library and saves the current one first, so you can undo it. Use it to recover a song that is not in the Trash, an old playlist order, or a song from before your edits. Find it in Settings > Utilities.

 

For more, see Back up and restore your library on the iReal Pro website.