CREATE TABLE IF NOT EXISTS t_todo (
    todo_id BIGINT AUTO_INCREMENT PRIMARY KEY,
    content VARCHAR(200) NOT NULL,
    owner_id BIGINT NOT NULL,
    owner_name VARCHAR(100) NOT NULL,
    creator_id BIGINT NOT NULL,
    creator_name VARCHAR(100) NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT '待处理',
    created_at_utc DATETIME(3) NOT NULL,
    operated_at_utc DATETIME(3) NOT NULL,
    handle_remark VARCHAR(500) NULL,
    INDEX idx_todo_owner_status (owner_id, status),
    INDEX idx_todo_operated (operated_at_utc)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户待办事项';