Sprint removed by YoUTrack

On Friday evening, all our Issues lost their Sprint!!! In the comments, it is said
YouTrack 21 Aug 2020 21:40
Sprints: KW 34 - 24.08.2020
- I need to set this information back: How can I do that?
- Why did that Happend?
1 comment
Official comment

We've investigated this issue in a private support request and came to the conclusion that someone has changed the settings of the "Sprints" custom field values.

There are two options on how to get the values back:

1) By rolling back to a backup made before the changes.

2) Via a custom REST API script that would check the history of the affected issues and get the "Sprints" values back.

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