Django and Mezzanine troubleshooting

Inherited a Mezzanine site built by someone else at work. Having trouble with the file.

We have two sites and each uses a different local_settings file. One file works great, and the other doesn’t seem to upload any changes to the site.

My questions are:

Will the file throw an error if it doesn’t match the database criteria when you deploy with fabric?
Does the USER part of have to match the USER on the database local_settings?
AND to make changes to, I have to manually restart the development server. How do I do that?