如果需要最新的数据，则需要手动删除这些文件。
You'll need to delete these files manually if the most recent data is required.
只要不手动删除这些数据，它们就会永远保留在性能数据库中。
Data remains in the performance database forever unless you delete it manually.
现在，要避免此错误，您需要在删除歌曲以前手动删除对它的引用。
For now, to avoid this error, you need to remove references to a song manually before deleting it.
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