text: CREATE TABLE IF NOT EXISTS `{$DB_PREFIX}{$TABLE_NAME}` (
      `reference` INT UNSIGNED NOT NULL,
      `postcode` INT UNSIGNED NOT NULL,
      `origin` INT UNSIGNED NOT NULL,
      `volume` float unsigned NOT NULL,
      `weight` float unsigned NOT NULL,
      `value` float unsigned NOT NULL,
      `price` float NOT NULL,
      `date` datetime NOT NULL,
      PRIMARY KEY (`reference`,`postcode`,`origin`,`volume`,`weight`,`value`),
      UNIQUE KEY `quote` (`reference`,`postcode`,`origin`,`volume`,`weight`,`value`)
  )