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I don't Jepsen has any relevance to embedded (in-process) databases, nor to any single-node databases. The properties its testing for are related to network partition tolerance.

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But the tool that jepsen uses to check whether a schedule is serializable would still be useful for any database that supports concurrent operations.

I agree with that. For example, Jepsen has analyzed non-replicated PostgreSQL: https://jepsen.io/analyses/postgresql-12.3

There are plenty of mistakes you can make in single-process code while implementing transactions.

Agreed.

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