After several tests on the data in 2008-03, it was required to revert to the original data from PORIAZ / old hust kvalobs. Four easy steps:

$ cd /metno/kvalobs/scratch
$ psql kvalobs
$ delete from data where obstime>'2008-02-28' and obstime<'2008-04-01';
##### Assuming that /metno/kvalobs/scratch/data-200803 is in place ...
$ \copy data FROM data-200803/data-200803.dat WITH DELIMITER AS '|'