text: -- Add device_mac column
  ALTER TABLE user ADD `device_mac` VARCHAR(255) NULL DEFAULT NULL;
  
  -- Add operation log table
  
  CREATE TABLE `operation_log` (
  	`id` BIGINT(20) NOT NULL AUTO_INCREMENT,
  	`version` BIGINT(20) NOT NULL,
  	`created` DATETIME NOT NULL,
  	`device_mac` VARCHAR(255) NULL DEFAULT NULL,
  	`address` VARCHAR(255) NULL DEFAULT NULL,
  	`user_id` BIGINT(20) NULL DEFAULT NULL,
  	`current_balance` DOUBLE NOT NULL,
  	`operation_type` VARCHAR(255) NOT NULL,
  	`longitude` VARCHAR(255) NOT NULL,
  	`latitude` VARCHAR(255) NOT NULL,
  	PRIMARY KEY (`id`),
  	INDEX `FKbu047c0s7dv7e1dtpvuedch19` (`user_id`),
  	CONSTRAINT `FKbu047c0s7dv7e1dtpvuedch19` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`)
  )
  COLLATE='latin1_swedish_ci'
  ENGINE=InnoDB
  AUTO_INCREMENT=77
  ;
  