Retrieving username in custom report

I'd like to make a report called something like 'My daily changes' for reviewing purposes. This would list all artifact changes made by 'me' (the one requesting the report) on the current date. This in order to summarize changes I have just made to submit to the review group, so they know what artifacts and changes to look at. 

The data itself is no problem, but I can't see a way to easily retrieve the name /ID of the user that has pressed the 'Generate Report' button.  Perhaps ESQL provides some function to retrieve the LDAP login name of the 'current user' but I really need the Spira user ID so I can filter the records using this.

If this is not available, consider this a feature request, which I think should not be too hard to implement (something like having a token {$UserId} in my query). I'm sure I could think of several other useful things to do with this (My Assigned Defects, My tasks, etc....)