Redmine

Thank for authors, We use redmine in project mangement. It's a great project.
Here is the user story how we use it,

1. When a thing appear need someone to do, anybody create an issue(aka. ticket) and assign to (person A).
2. When (person A) done the job, he will reply the status update and changed the assignee to another (person B) to verify.
3. The (person B) done verify, he will reply the status update and close the ticket.

Here is the question,
In the end of month, (person A) need to calculate how he performance for the job.
So he need a UI to search the ticket whom through him.

The filter UI currently can search "status", "(currently) assignee" ... but no history assignee options.
Can you provide this feature for us?