what kind of file has the extension ".json.db"? - json

I came across a file that have the following extension ".json.db"
I can't find what kind of file is it.
Any ideas.
thanks in advance for your help!

This extension is used by many different databases, run the command file my-file.json.db to try to figure out which one created it.
file is "a file type guesser"

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With such a few details no one rather than you can find what's wrong.
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And this is the url for one of the .wav files:
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