showing quesiton-keys instead of ids

common.php

@@ -893,6 +893,12 @@ function qdb_question_local_id(string $questionID, ?string $questionnaireID = nu
     return $pos !== false ? substr($questionID, $pos + 2) : $questionID;
 }
 
+/** Column / export header: stable question key, else local id (q1, q2, …). */
+function qdb_question_column_label(array $config, string $defaultText, string $questionID, ?string $questionnaireID = null): string {
+    $key = qdb_question_key($config, $defaultText);
+    return $key !== '' ? $key : qdb_question_local_id($questionID, $questionnaireID);
+}
+
 function qdb_make_question_id(string $questionnaireID, string $localId): string {
     return $questionnaireID . '__' . $localId;
 }