"Back to the Future" in BOINC!

I was using the calendar function of my PC to check a date in March, and it messed up the 'statistics' tab view of BOINC Manager.

I double-clicked the time display at the lower right of the screen, bringing up the calendar window. Then I advanced the month to see March. Now March 27 was highlighted instead of February 27. After seeing what I needed of March, I set the view back to February and closed the calendar window.

Later, I clicked the 'statistics' tab of BOINC Manager to see the 'statistics' view, which I usually have set to the 'All projects (sum)' mode. Instead of seeing the usual plot spanning the last 30 days, I saw one straight line for each project, jumping from February 26 to March 27!

I think what happened was that BOINC Manager updated its statistics data while the calendar was set a month ahead. I didn't realize that I had changed the system date, since I didn't click 'OK' with the wrong date. BOINC Manager apparently then recorded the latest totals for March 27, and then purged the 'old' data that was more than 30 days older than March 27.

Now it has recorded totals for February 27, so that the plot jumps from February 26 forward to March 27, and then back to February 27. Like this:



Is there some way for me to restore the statistics data and view? I found files such as statistics_www.primegrid.com.xml in the BOINC folder, but these appear to be only reporting files, not a files that I can change to change the data. I have been saving 'screen shots' of these plots every half-month, and this is messing up my records.