Now, I've never used DBIC, but I'm guessing the problem is this... You call add_columns for the password column twice. The first time you supply a SQL data type; the second time you do not. I suppose what happens is that when a column already exists (the password column already exists the second time you add it), then add_columns overwrites the original definition for the column rather than updating it. So the password column's initial definition which includes a data type gets overwritten with a new definition which does not.

Thus you should be able to fix your issue by moving all the details for the password column from the second add_columns call up to where the password column is initially defined; and then ditching the second add_columns call.