[tshaddox]

If you were going to enforce a maximum size so that you could sort on the client, I bet you could just use an integer and rewrite the entire sequence from 1 to N on every reorder operation. Unless you were expecting to have way more writes than reads, which is a little hard to imagine.

[eatonphil]

> so that you could sort on the client

You could probably also sort in the database with a recursive cte or with PL/pgSQL.

[tshaddox]

Indeed, but AFAIK that is still much slower than sorting on an indexed integer column, which probably means you still need to enforce a maximum list length.