= phenomenon =
Requests to https://apps.stg.fedoraproject.org/tagger result in a 500 error.

= background analysis =

The /etc/httpd/logs/error_log shows the following:

{{{
<class 'sqlalchemy.exc.OperationalError'>: (OperationalError) FATAL: password authentication failed for user "fedoratagger"
}}}

The sqlalchemy url in /etc/fedoratagger/production.ini is

{{{
sqlalchemy.url = postgres://fedoratagger:<snip>@db-community.stg/fedoratagger
}}}

I'm not sure what db tagger was pointed at before when it was running on
community01.dev, but it worked then.

= implementation recommendation =

Setup credentials for a 'fedoratagger' user and db on db02.stg.