The longterm persistent data will newe be stored to the PLC since the PLC storage is not designed for such purpose. So right now, you will only see the values in the graph since the load of the page. In the future, the graph widget might be able to read the data from the online DB but that's just an idea.
The tutorial on the KB is written as a step by step guide which covers all steps that need to be done in order to make it work. What do you mean by "key value pairs"? If you are getting an error when trying to login to the DB viewer and filled incorrect credentials, then there is no data yet in the database. Check in the System status while in Debug mode that there are actually data sent to the DB. Also, make sure that the Network settings are correct so that the PLC has a connection to the Internet and can resolve DNS names.