text: create table paragraph (
    id bigint unsigned not null auto_increment
  , notebook_id bigint unsigned not null
  , notebook_history_id bigint unsigned not null
  , code text not null
  , result text not null
  , created_at timestamp not null default current_timestamp
  , updated_at timestamp not null default current_timestamp on update current_timestamp
  , primary key (id)
  );
  
  alter table paragraph add index paragraph_0001 (
    notebook_id
  , notebook_history_id
  );
  