Django正在用我的DATABASES设置做一些奇怪的事情

I want to switch db backends from django_pyodbc to sqlite in order to make sure my custom user model works before I start messing around with my db. So I commented out the DATABASES setting and put in a new one which uses sqlite. I've done this before (on this project as well) with no problems, but now I have no idea what's going on.I want to switch db backends from django_pyodbc