Quite an interesting move on the buzz that (still) is GraphQL and in this case, Hasura have been quite inventive I think by building a cloud/local mechanism to generate GraphQL backends by pointing at (selectively!) PostgreSQL, MySQL and soon to be MS-SQL. Hasura also helps generate the fine-grained authentication too as well as offering a way to integrate business logic and more.
Some links to get you started:
Main Hasura SiteDirect link to the Hasura docsA cool learning with Jason; Serverless with Hasura (which looks cool and I actually need to watch myself!)
Episode 14 - Hasura GraphQL Engine