I've had my Clara for a few years and had a Kobo Aura before that and the only database corruption I ever experienced was running firmware 4.31. And I never worry about whether a book is open or anything else.
From 4.31, I downgraded to 4.30 and things were good. When 4.32 came up I upgraded to that and things have been good. Poor 4.31. There was just something off there.
Since my one database issue, I have set up Kobo Utilities to back up on every connection.
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