1. Add column update_at_utc of type datetime2.
2. When inserting, update_at_utc = GETDATEUTC()
3. When retrieving, order by update_at_utc
4. When moving a row in the queue, for example between rows 3 and 4, simply take average of update_at_utc of these rows and use it to set update_at_utc of the row being moved.

1. Remember update_at_utc of the row N places lower down
2. For all rows between the current and the new position: assign row's update_at_utc to the preceding row's update_at_utc
3. Assign update_at_utc of the row being moved to the date remembered in point 1 above.