postgresql: FATAL: password authentication failed for user “douglas”

The SQL you are running does not match the user you are attempting to use.

You will need to create the user if it does not exist:

CREATE USER douglas WITH PASSWORD 'vamointer';

or if it does exist, change that user’s password instead.

ALTER USER douglas WITH PASSWORD 'vamointer';

Once you have done that you should have more luck. You may need to assign permissions to that user as well.