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Where Databases Fit in the Always-Valid Domain Model

Vladimir Khorikov asks an important question:

Today, we’ll talk about an important question: how does the application database fit into the concept of Always-Valid Domain Model?

In other words, is the database part of the always-valid boundary or should you consider it an external system and validate all data coming from it?

Pre-read, my answer was no, databases are part of the external world and your domain model needs to validate every time because who knows what weirdo did something to your data while it slept.

Post-read, well, you’ll have to read to find out.

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