agent foundation

lib/Service/CustomField/UserCustomFieldValueService.php

@@ -251,7 +251,8 @@ class UserCustomFieldValueService
         }
 
         $tenantIds = self::normalizeTenantIds($tenantIds);
-        // Always clean values that belong to tenants no longer assigned to the user.
+        // Always clean values for tenants no longer assigned — happens even when !$canEdit,
+        // because orphaned custom field data should not persist after tenant reassignment.
         if (!UserCustomFieldValueRepository::deleteByUserOutsideTenantIds($userId, $tenantIds)) {
             return ['ok' => false, 'errors' => [t('Custom field values can not be saved')]];
         }
@@ -454,6 +455,7 @@ class UserCustomFieldValueService
                 continue;
             }
 
+            // URL key prefixes: cf_ = single-value (select/boolean), cfm_ = multiselect, cfd_ = date range.
             if (preg_match('/^cf_([a-f0-9-]{36})$/', $key, $match)) {
                 $uuid = $match[1];
                 $definition = $definitionMapByUuid[$uuid] ?? null;