upgrade matrice with files

public/userarea/update_mescola_lot_qty.php

@@ -0,0 +1,33 @@
+<?php
+include('include/headscript.php');
+header('Content-Type: application/json');
+
+$id = isset($_POST['id']) ? (int)$_POST['id'] : 0;
+$qty = isset($_POST['qty']) ? (float)$_POST['qty'] : null;
+
+if ($id <= 0 || $qty === null) {
+    echo json_encode(['success' => false, 'message' => 'Invalid input']);
+    exit;
+}
+
+if ($qty < 0) {
+    echo json_encode(['success' => false, 'message' => 'Quantity cannot be negative']);
+    exit;
+}
+
+$db = DBHandlerSelect::getInstance();
+$pdo = $db->getConnection();
+
+try {
+    $stmt = $pdo->prepare("UPDATE mescole_supplier_lots SET qty = ? WHERE id = ?");
+    $stmt->execute([$qty, $id]);
+
+    if ($stmt->rowCount() === 0) {
+        echo json_encode(['success' => false, 'message' => 'No rows updated (id not found?)']);
+        exit;
+    }
+
+    echo json_encode(['success' => true]);
+} catch (PDOException $e) {
+    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
+}