fixed tested components

public/userarea/add_part_quick.php

@@ -0,0 +1,52 @@
+<?php
+header('Content-Type: application/json');
+
+ini_set('display_errors', 1);
+error_reporting(E_ALL);
+
+require_once(__DIR__ . '/include/headscript.php'); // così hai Auth + $iduserlogin + DBHandlerSelect
+
+try {
+    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+        throw new Exception('Invalid request method');
+    }
+
+    $iddatadb = isset($_POST['iddatadb']) ? (int)$_POST['iddatadb'] : 0;
+    $part_description = isset($_POST['part_description']) ? trim($_POST['part_description']) : '';
+
+    if ($iddatadb <= 0) {
+        throw new Exception('Missing iddatadb');
+    }
+
+    if ($part_description === '') {
+        throw new Exception('Part description is empty');
+    }
+
+    // (opzionale ma consigliato) limita lunghezza come da DB varchar(255)
+    if (mb_strlen($part_description) > 255) {
+        $part_description = mb_substr($part_description, 0, 255);
+    }
+
+    $db = DBHandlerSelect::getInstance();
+    $pdo = $db->getConnection();
+
+    // Insert minimal
+    $stmt = $pdo->prepare("
+        INSERT INTO identification_parts (iddatadb, part_number, part_description)
+        VALUES (?, 1, ?)
+    ");
+    $ok = $stmt->execute([$iddatadb, $part_description]);
+
+    if (!$ok) {
+        throw new Exception('Insert failed');
+    }
+
+    echo json_encode([
+        'success' => true,
+        'message' => 'Part added',
+        'id' => $pdo->lastInsertId()
+    ]);
+} catch (Exception $e) {
+    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
+}
+exit;