CREATE TABLE IF NOT EXISTS `runtel_tariff_$mid` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(255) DEFAULT NULL,
  `service_id` int(11) NOT NULL DEFAULT 0,
  `cost` decimal(12,2) NOT NULL,
  `config` text NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE IF NOT EXISTS `runtel_tariff_contract_$mid` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `contract_id` int(11) NOT NULL DEFAULT 0,
  `tariff_id` int(11) NOT NULL DEFAULT 0,
  `date_from` datetime NOT NULL,
  `date_to` datetime DEFAULT NULL,
  `config` text NOT NULL,
  PRIMARY KEY (`id`)
);

ALTER TABLE `runtel_tariff_contract_$mid` CHANGE COLUMN `date_from` `date_from` datetime NOT NULL, CHANGE COLUMN `date_to` `date_to` datetime DEFAULT NULL;