title: Problems with postgres database in redmine after change in password
body: <p>First, I'm a total newbie and I guess that's why this error occurred in the first place.
  A colleague of mine stopped working and so I had to take over administrative stuff as the <code>redmine</code> we use and making backups.
  So I wanted to schedule these backups automatically. Somewhere on the way I changed <code>/etc/postgresql/9.1/main/pg_hba.conf</code> for user postgres (that's the one for the redmine database.
  from <code>local all postgress peer</code> to <code>local all postgress trust</code> so I could run a shell program in crontab. This worked but then redmine doesn't work anymore. I get this:</p>
  
  <blockquote>
    <p>FATAL: password authentication failed for user "postgres" FATAL:
    password authentication failed for user "postgres" (PG::Error)</p>
  </blockquote>
  
  <p>On this the error site for redmine. I changed everything back and restarted everything, but it did't work. 
  Then I used an older backup to restore but still.
  So, now I have no idea whats wrong. Maybe someone can help me.
  Thanks.
  Barbara</p>