public static function handle_submission($contact_form)
{
    $submission = WPCF7_Submission::get_instance();
    if (!$submission) return;

    $data = $submission->get_posted_data();

    $insert = [
        'kindname'     => sanitize_text_field($data['Kindname'] ?? ''),
        'geburtsdatum' => sanitize_text_field($data['Geburtsdatum'] ?? ''),
        'elternname'   => sanitize_text_field($data['Elternname'] ?? ''),
        'woche'        => sanitize_text_field($data['Woche'] ?? ''),
        'email'        => sanitize_email($data['Email'] ?? ''),
        'telefon'      => sanitize_text_field($data['Telefon'] ?? ''),
        'nk'           => sanitize_text_field($data['NK'] ?? ''),
        'nktelefon'    => sanitize_text_field($data['NKTelefon'] ?? ''),
        'allergien'    => sanitize_textarea_field($data['Allergien'] ?? ''),
        'sonstiges'    => sanitize_textarea_field($data['Sonstiges'] ?? ''),
        'sepa'         => !empty($data['SEPA']) ? 1 : 0,
        'bildrechte'   => !empty($data['Bildrechte']) ? 1 : 0,
    ];

    $insert['status'] = FCM_DB::calculate_status($insert['woche']);

    FCM_DB::insert($insert);

    FCM_Mail::send($insert);
}