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Re:Ask HN: Schema aware partial relational database copy wit... by acemarke on Saturday February 12, 2022 @11:52AM (#30314177)
I suspect you're looking for https://github.com/Wisser/Jailer .

(I'd seen it before as well, couldn't remember the name immediately, and googled for `sql database subset relation export tool` to find it again.)

Re:Ask HN: Schema aware partial relational database copy wit... by omairinam on Friday February 25, 2022 @01:57PM (#30470789)
Yes. That was it. Thanks @acemarke.