Get Redmine-Issues via REST API restricted by 'updated_by' grouped on 'updated_on'

Question

Considering Redmine REST API and http://theadmin.org/articles/redmine-query-reference I found no way to access the 'updated by/on' criteria of an issue.

So, is there any other possibiltiy to build a query that returns all issues that

• where updated by me
• group by day_of(updated_on)

Update

Actualy this SQL-Query on the Redmine-Database does what I want, but that is - obviously - no solid solution

select DATE(created_on), GROUP_CONCAT(DISTINCT journalized_id ORDER BY journalized_id ASC SEPARATOR ',') 
from journals where user_id = <my user id> and journalized_type = 'Issue'
group by DATE(created_on) order by created_on desc;