PostgreSQL has a powerful introspection API which allows us to ask it all about
a database - what schemas, tables, columns, constraints, indexes, functions,
comments, etc it has - and we use this information to construct the GraphQL
schema automatically. You provide the list of schemas to inspect via the
pgSchemas setting, e.g.
If you're interested to see how we do this, the introspection query can be found in our GitHub.