Turn on postgres logging (Configured in /var/lib/pgsql/data/postgresql. Conf and grep for "ERROR REPORTING AND LOGGING"). Or you might want to take the SQL and run it yourself to see what error happens.
It could be a constraint thats failing because of your update.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.