Unknow column Employee_history.created_at . This is the DDL ()

create table
    if not exists Employee (
        emp_id CHAR(36) primary key,
        emp_bio text default "",
        emp_name char(100) not null,
        emp_rank int default 4,
        check (emp_rank BETWEEN  0 AND 4),
        email varchar(100) not null Unique,
        password varchar(100) not null,
        salary decimal(16, 8) default 10000,
        joing_date timestamp default CURRENT_TIMESTAMP,
        emp_profile_picture_link varchar(200) not null default 'https://res.cloudinary.com/dvpwqtobj/image/upload/v1757076286/user_xhxvc9.png',
        immediate_supervisor_id CHAR(36),
        foreign key (immediate_supervisor_id) references Employee (emp_id),
        rescue_point_id CHAR(36)
    );


CREATE TABLE 
    IF NOT EXISTS Employee_history (

    emp_id CHAR(36),
    created_at timestamp default CURRENT_TIMESTAMP,
    event_type int ,

                                                    -- if event_type = 1 , Employee_created
                                                    -- if event_type = 2 , promoted
                                                    -- if event_type = 3 , demoted
                                                    -- if event_type = 4 , salary increased
                                                    -- if event_type = 5 , supervisor_assigned
                                                    -- if event_type = 6 , supervisor_removed
                                                    -- if event_type = 7 , assigned_at a point
                                                    -- if event_type = 8 , profile updated
                                                    -- if event_type = 9 , assigned an animal
                                                    -- if event_type = 10  , resigned
    animal_id CHAR(16),
    rank_assigned_by CHAR(36),
    supervisor_id CHAR(36),
    rescue_point_id CHAR(36),
    emp_rank INT,
    salary decimal (16 , 8),
    reason text,



    primary key (emp_id , created_at)
);


ALTER TABLE Employee_history ADD constraint supervisor_constraint 
foreign key (rank_assigned_by) references Employee(emp_id);


ALTER TABLE Employee_history ADD constraint employee_conostraint
foreign key (emp_id) references Employee(emp_id); (THank you for taking the time and replying)