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How to connect GraphQL and PostgreSQL

GraphQL has mutations, Postgres has INSERT; GraphQL has queries, Postgres has SELECT's; etc., etc.. I haven't found an example showing how you could use both in a project, for example passing all the queries from front end (React, Relay) in GraphQL, but to a actually store the data in Postgres.

Does anyone know what Facebook is using as DB and how it's connected with GraphQL?

Is the only option of storing data in Postgres right now to build custom "adapters" that take the GraphQL query and convert it into SQL?