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I would also love this, in the past I’ve used the H2 in-memory database for tests with Spring boot applications.

The Hibernate ORM handles configuring the H2 schema but they’re not fully compatible, so it means I have to be careful to not rely on Postgres-specific features. I generally am not testing database logic, just need a working persistence layer to get the tests running, but an in-memory Postgres implementation would be amazing.

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Although it's something I'd love to write, supporting it over a long time as pure FOSS would probably be a sad experience. I wonder what model could be used here. Maybe something like patreon or "sponsor a feature" with an open-source project? FOSS core + proprietary Java / .NET bindings because corps can pay?

Yeah, for sure this is the type of niche, high-effort work that would be used extensively by the closed-source world and yet struggle to find adequate support.

IIRC h2 supports a postgres compatibility mode. Though I'm not sure how feature complete it is.

http://h2database.com/html/features.html

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