install.php occured after adding a database user

Good day all,

After not working on my site for a while I logged on and did some cosmetic work through the dashboard. The next morning I was greeted by an error establishing a connection to the database which showed up on all three of my devices.

Following the advice of a support article from my hosting company i attempted to resolve the problem by creating a new database user and editing the wp-config.php to accept the new user. When I logged on the site again both through the main site and the wp-admin I was directed to mysite/install.php. This happens every time i log on and from any device.

I have spoken to my hosting companies customer service multiple times and tried looking for a solution to the problem and so far have found none. All the site’s files are still there and I can’t seem to find anything wrong. Before this incident I had made no backup of the site, and as my faith in my host’s automated backup begins to waver I find myself increasingly concerned that I might loose all my hard work.

Does anyone know of a solution, potential problem I have overlooked or at the very least a way to ensure my site will not be lost?

Thank you.