I have found the table with the workspaces: 

>K2]..dbo]..com_K2_System_Workspace_SmartObject_NavigationSchemeData] 

I have also figured out that the deeplink with ../workspace/#?workspaceID=xxxx

does not work the first time and is then rerouted to the default workspace. It seems it requires a cookie, because the second time it does work. When you clear your cookies the issue re-occurs. 

I guess this is not fixable???