fixed flag main

public/userarea/update_mapping_flag.php

@@ -46,7 +46,7 @@ try {
         $stmt = $pdo->prepare("
             SELECT COUNT(*) 
             FROM template_mapping 
-            WHERE template_id = ? AND main_field = 1 AND id != ?
+            WHERE template_id = ? AND main_field = '1' AND id != ?
         ");
         $stmt->execute([$templateId, $mappingId]);
         $count = (int)$stmt->fetchColumn();
@@ -76,8 +76,9 @@ try {
         $uncheckedOthers = $stmt->rowCount() > 0;
     }
 
+    $bindValue = ($field === 'main_field') ? (string)$value : $value;
     $stmt = $pdo->prepare("UPDATE template_mapping SET {$field} = ? WHERE id = ?");
-    $result = $stmt->execute([$value, $mappingId]);
+    $result = $stmt->execute([$bindValue, $mappingId]);
 
     if (!$result) {
         $pdo->rollBack();