42 GraphQL was a Façade of the 42 REST API, using GraphQL.
42 REST API was very slow and not easily understable.
The idea here was to wrap it in a GraphQL Schema, and cache resources in a Redis cache for faster responses.
GraphQL permits to reduce heavily number of REST API calls, as server response maps the client query, which resulted in a really fast API.
This was done without access to the database, only upon the public REST API.