CREATE TABLE si_managers (
	id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
	name VARCHAR(255) NOT NULL UNIQUE
) ENGINE=InnoDB;

ALTER TABLE si_inspections ADD COLUMN manager_id INT DEFAULT NULL;
ALTER TABLE si_inspections ADD KEY idx_manager_id (manager_id);
ALTER TABLE si_inspections ADD FOREIGN KEY fk_manager (manager_id) REFERENCES si_managers (id);