GRASS: Reset 'cat' column?

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I've got a regular polygon file that looks like this:



Unfortunately, this file stems from a v.overlay so that the 'cat' values are are a bit messed up. I would like them e.g. to start in the upper left corner and increase from left to right and top to bottom.

How is that possible?I already tried renaming and updating the columns, but somehow this is never allowed as is touches (of course) the 'cat' column.



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