ALTER TABLE `employee_letters`
ADD COLUMN `contract_start_date` DATE NULL DEFAULT NULL AFTER `updated_at`;

ALTER TABLE `employee_additional_details`
ADD COLUMN `second_probation_period` TEXT NULL DEFAULT NULL;


ALTER TABLE `employee_additional_details`
ADD COLUMN `approver_1` INTEGER NULL DEFAULT 0;

ALTER TABLE `employee_additional_details`
ADD COLUMN `approver_2` INTEGER NULL DEFAULT 0;





