How to validate data?

I'm an SWE (**not a data scientist**) and trying to build a generic data validation tool (or find appropriate tools to adopt) for my company.

I started looking into libraries such as Great Expectations, Pydantic, etc.. And they all seem promising, but I don't think they solve the issue of validating *changes in data* (as far as I can tell). They seem to be good at validating that data is within an expected range, of an expected type, etc., but …

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