VoIP Detective has a free version that you can use without time limit.  The PRO (paid) version adds more features and unlimited data retention.  As a bonus, you can pull CUCM, CUBE, and Webex Calling into the same app.You can get more information her...

VoIP Detective call reporting can do this through the "endpoint utilization" report.  You can see more here:VoIP Detective Endpoint Utilization Report 

CUCM will purge the oldest data - once that data is gone then it's gone, you cannot recreate it.  If you need to keep data that long, you should look into a third party reporting solution.  VoIP Detective has a free version that you can try, and ther...

You can restart the CDR services without CLI access - it's done using the Unified Serviceability section of CUCM.It's not uncommon for these services to need to be reset, but I would not expect it to need restarting every two weeks.  It could be that...

Take a look at the VoIP Detective Webex reporting.  The team report is designed to do exactly what you are looking for - email a report of select users / numbers at a set schedule.