-- Bootstrap SQL for local-dev Postgres, applied on FIRST boot only
-- (Postgres image runs files in /docker-entrypoint-initdb.d once,
-- when the data volume is empty).
--
-- Implements the role + schema layout from ADR-0013 (Audit trail,
-- separated Postgres schema, append-only by Postgres role grants).
-- Production deployment manifests (future infrastructure ADR) will
-- replicate the same layout with real service accounts; in dev the
-- default `portal` user (created automatically from POSTGRES_USER)
-- is the schema owner, and the audit roles are granted to it for
-- testing role-based access patterns locally.

-- ---------------------------------------------------------------- Audit roles
-- NOLOGIN: these are permission containers, not login users. The BFF
-- connects as a login user that has been GRANTed the role.
CREATE ROLE audit_owner NOLOGIN;
CREATE ROLE audit_writer NOLOGIN;
CREATE ROLE audit_reader NOLOGIN;
CREATE ROLE audit_archiver NOLOGIN;

-- ---------------------------------------------------------------- Audit schema
-- Owned by audit_owner so DEFAULT PRIVILEGES below take effect for
-- every future table created under the schema (Prisma migration etc.).
CREATE SCHEMA audit AUTHORIZATION audit_owner;

GRANT USAGE ON SCHEMA audit TO audit_writer, audit_reader, audit_archiver;

-- ---------------------------------------------------------------- Append-only contract
-- ADR-0013 §"Append-only by role grants":
--   audit_writer   → INSERT only
--   audit_reader   → SELECT only
--   audit_archiver → DELETE only (used to prune past retention)
--   nobody         → UPDATE, TRUNCATE
ALTER DEFAULT PRIVILEGES FOR ROLE audit_owner IN SCHEMA audit
  GRANT INSERT ON TABLES TO audit_writer;

ALTER DEFAULT PRIVILEGES FOR ROLE audit_owner IN SCHEMA audit
  GRANT SELECT ON TABLES TO audit_reader;

ALTER DEFAULT PRIVILEGES FOR ROLE audit_owner IN SCHEMA audit
  GRANT DELETE ON TABLES TO audit_archiver;

-- ---------------------------------------------------------------- Dev convenience
-- The dev superuser (created by Postgres from POSTGRES_USER, default
-- `portal` but overridable in infra/local/.env) bypasses these grants
-- anyway, but granting the audit roles explicitly lets us test
-- role-based access with `SET ROLE audit_writer;` etc. from a psql
-- session against the dev DB.
--
-- `current_user` resolves at script execution time to whoever is
-- running the init SQL — i.e. the superuser created from POSTGRES_USER,
-- whatever its name happens to be. Hard-coding `portal` here was
-- wrong: it broke any setup where the contributor changed
-- POSTGRES_USER in their .env.
--
-- Production never grants all four roles to one user.
GRANT audit_owner, audit_writer, audit_reader, audit_archiver TO current_user;
