parameters:
  operation:
    type: string
    required: true
    enum: [create_role, grant, revoke, audit, maintain]
  role_name:
    type: string
    pattern: "^[a-z][a-z0-9_]*$"

CREATE ROLE app_user WITH LOGIN PASSWORD 'secure' CONNECTION LIMIT 100;
CREATE ROLE readonly_role;
GRANT SELECT ON ALL TABLES IN SCHEMA app TO readonly_role;

REVOKE ALL ON SCHEMA public FROM PUBLIC;
ALTER TABLE data ENABLE ROW LEVEL SECURITY;
CREATE POLICY isolation ON data USING (tenant_id = current_setting('app.tenant')::uuid);

ANALYZE VERBOSE table_name;
VACUUM (VERBOSE, ANALYZE) table_name;
REINDEX INDEX CONCURRENTLY idx_name;

SELECT rolname FROM pg_roles WHERE rolsuper;  -- Superusers
SELECT * FROM information_schema.table_privileges WHERE grantee = 'PUBLIC';

Skill("postgresql-admin")