Connection to PostgreSQL

dotnet user-secrets init
dotnet user-secrets "ConnectionStrings:Connection" "Host=myserver;Username=mylogin;Password=mypass;Database=mydatabase;Port=5432"

OR

Initialize user-secrets dotnet user-secrets init

Then go to %APPDATA%\Microsoft\UserSecrets\<user_secrets_id>\secrets.json

Add

{
  "ConnectionStrings": {
	"Connection": "Host=myserver;Username=mylogin;Password=mypass;Database=mydatabase;Port=5432"
  }
}