I'm using Nhibernate and Fluent Nhibernate.

I fell into the trap I think a lot of new users fall for, and ended up with all my varchar columns at 255 chars. For politic reasons far too boring to go into, there was immediately data in these fields that I'm not supposed too delete (boo) so I need to update the column lengths without dropping and re-creating tables.

However if I apply a convention for string length to the Fluent configuration, and use the NHibernate UpdateSchema method, only new tables seem to get the new varchar length. Is this correct and is there a way to apply this to the existing tables??