FORSLAG-107: Fixed length of temp store key

web/modules/custom/hoeringsportal_citizen_proposal/src/Helper/WebformHelper.php

@@ -117,9 +117,16 @@ public function saveSurveyResponse(WebformInterface $webform, ContentEntityInter
 
  /**
  * Create temp store key.
+ *
+ * This key will have a user id prepended before being stored in the database
+ * table key_value_expire. The key name in this table allows at most 128
+ * character and for anonymous users a random session id with a length around
+ * 43 will be prepended (cf. Drupal\Core\TempStore\PrivateTempStore::set()).
+ * A webform id can be at most 32 characters which leaves us with at most
+ * 128-43-32 = 53 characters for our key prefix.
  */
  private function createTempStoreKey(WebformInterface $webform): string {
- return self::class . '_' . $webform->id();
+ return 'citizen_proposal_webform:' . $webform->id();
  }
 
  /**