Well a quick way of doing this is make a datagrid overview for the Admin.
In select a column and set the aggergate function to count. That way Mendix counts the records:
If you want the data to be user specific, you can add a searchfilter for this. If the Admin searches on the user the datagrid will show all the created objects by this user and show the count.
I think I would try to set a one to many association between the account and journal entities, set the association after the journal commit and use an aggregate /count function in the account grid to show the count. Not sure if aggregate count works on associations tough