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Data is just crystallized business logic. Anemic databases aren’t a big deal when the database is just a persistence layer for a single app but, when you’re rewriting the application code or allowing BI queries directly against the database, designing a database as a service whose interface is stored procedures starts making data integrity much easier.

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Once you start having multiple data sources, business logic implemented in application code might be easier to reuse than business logic implemented in one of the data sources. For example: start with Postgres, then add ClickHouse to the mix. It might be easier to let the application handle access to both DBs, rather than write RLS policies in Postgres and then try to apply them to ClickHouse.

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