feat(db): also reject TRUNCATE on audit_log (statement-level trigger)

crates/db/migrations/0001_audit_log.sql

@@ -26,3 +26,7 @@ $$ LANGUAGE plpgsql;
 CREATE TRIGGER audit_log_immutable
     BEFORE UPDATE OR DELETE ON audit_log
     FOR EACH ROW EXECUTE FUNCTION audit_log_reject_mutation();
+
+CREATE TRIGGER audit_log_no_truncate
+    BEFORE TRUNCATE ON audit_log
+    FOR EACH STATEMENT EXECUTE FUNCTION audit_log_reject_mutation();