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There is. For example, four months ago [0] they've accidentally stumbled upon about an explicitly documented quirk of SQLite file format.

[0] https://news.ycombinator.com/item?id=45101854

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I stumbled on the lock page myself when I was experimenting with writing a sqlite vfs. It's been years since I abandoned the project so I don't recall much including why I was using the sqlitePager but I do recall the lockpage being one of the first things I found where I needed to skip sending page 262145 w/ 4096 byte pages to the pager when attempting to write the metadata for a 1TB database.

I'm surprised they didn't have any extreme tests with a lot of data that would've found this earlier. Though achieving the reliability and test coverage of sqlite is a tough task. Does make the beta label very appropriate.

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