Thanks for the feedback, Igor! Caching the schema at build time is definitely a great way of decreasing cold-start time, but it also means you’ll need to rebuild for each schema change, (which is probably not a bad practice, anyway).

The user_id setting needs to be passed into withPostGraphileContext's pgSettings which will automatically set the variable for your queries, as I’ve done here. It is essentially doing the following for you:

BEGIN;
SET "user_id" = '${userId}';
-- GraphQL query from PostGraphile runs here
COMMIT;