I found a hidden photos library on my external harddrive where also my main photos library lives. It's called .100s-Mediathek.photoslibrary. My mac is set to German, Mediathek translates to "photoslibrary". When I open the package, it contains some photos and videos from an import, along with other files just as a normal photo library. I'm on MacOS High Sierra.

What is it for, where does it come from and is it safe to delete it?

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