text: create table scheduled_tasks (
    task_name varchar(40) not null,
    task_instance varchar(40) not null,
    task_data blob,
    execution_time timestamp(6) not null,
    picked BOOLEAN not null,
    picked_by varchar(50),
    last_success timestamp(6) null,
    last_failure timestamp(6) null,
    last_heartbeat timestamp(6) null,
    version BIGINT not null,
    PRIMARY KEY (task_name, task_instance)
  )