@Duy Tran - A reference to the TableAPI you've built brought me here. Absolutely wonderful job with the article, and even a better job with building a scalable data system that enforces standardization.

Although you've underscored the importance of having the standardized metadata by way of defining interfaces and APIs rather than custom code, I'll still say one can't stress on that point enough. I'm curious to know about the testing and quality frameworks you've used or have you built your own?