with recursive todo_list_sorted as (
  	select
  		*
  	from
  		todo_list tl1 where prev_id is null
  	union all
  	select
  		tl1.*	
  	from
  		todo_list tl1
  	join
  		todo_list_sorted tl2 on tl1.prev_id = tl2.id
  )
  select * from todo_list_sorted