/^$/d
/^--/d
/^CREATE EXTENSION IF NOT EXISTS plpgsql /d
/^COMMENT ON EXTENSION plpgsql /d
/^COMMENT ON EXTENSION btree_gist /d
/^SET default_with_oids /d
/^SET default_table_access_method /d
/^SET idle_in_transaction_session_timeout /d
/^    AS integer$/d

s/ IMMUTABLE / /

s/ timestamp(6) / timestamp /