It is possible to drag 'n drop rows to change their order, but if you order by some column this "index order" is lost. I need some way to prioritize rows, with the most important at the top. I can do this by adding a column of type number, and manually enter the index for each row, but this is rather cumbersome.
What I need is some autonumbering system that updates an (could be hidden) index column with the order of the rows, and then the ability to sort by this column later on.