There has been a lot of buzz around having PostgreSQL for ASP.NET Core 3.1 web apps. But Configuring Identity Server 4 with PostgreSQL is a real challenge. I've made a simple video to configure the ASP.NET Core 3.1 based Web application that uses AngualrJS as front end with Single Page App capabilities with Identity Server 4 talking to the PostgreSQL database. Check out this Video tutorial on how to do that in detail http://bit.ly/2EkotL5 You can access the entire code here on github http://bit.ly/35okpFj