this is interesting! running tests on data is certainly a pain point for me, and there doesn't seem to be nearly the kind of infrastructure available as for, say, tests for code functionality.

Is this open source? Sending my data to a third party is a no-go, as is having a third-party connect to the database. Something part of a managed hosting service, though, or an add-on to an existing trusted hosted service that has gone through compliance (e.g. Heroku, AWS), would be more palatable.