Account for different DB Prefixes

Just a heads up you should update your wc_delete_orders function to account for different database prefixes.

    public function wc_delete_orders() {
      global $wpdb;
      $ran = true;
      $sql = "DELETE FROM " . $wpdb->prefix . "woocommerce_order_itemmeta";
      $sql = "DELETE FROM " . $wpdb->prefix . "woocommerce_order_items";
      $sql = "DELETE FROM " . $wpdb->prefix . "posts WHERE post_type = 'shop_order'";
      $rows = $wpdb->query( $sql );

      if( false !== $rows ) {
        $this->deleted = $rows;
        //add_action( 'admin_notices', array( $this, 'admin_notice_success' ) );
      }
    }