Line 315 is the one that opens the database connection. It seems pretty clear that the error is that the username/password you have configured for the database isn't working for some reason.
Is it possible that when you go to the site you're actually still going to the old server? It does take time for a domain name change to take effect. ETA:...or maybe it looked like it was working yesterday because it was still going to the old site, but the new site was never really working?
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