/**
  * Creates a new palette.
  * @param integer $warehouseId	Warehouse ID
  */
 private function create($warehouseId)
 {
     $number = Palette::getMaxNumber($warehouseId) + 1;
     $sql = "INSERT INTO " . Database::getTableName('palettes') . " (number, warehouse) VALUES(?, ?)";
     $id = Database::getInstance()->sql("insertPalette", $sql, 'ii', [$number, $warehouseId], false);
     $this->id = $id;
     $this->warehouseId = $warehouseId;
     Log::debug('Added palette #' . $this->id);
 }