Hello,
Thanks for calling Symantec. (Case # 05593826)
I would suggest you to first disable the logging of Syslog from SEPM, then delete the logs OR take a backup (just in case) before deletion.
You can also try editing the firewall policies to disable logging for any rules where this is no longer needed.
OR
Secondly you can try the following steps - In SEPM >> Admin >> Servers >> localhost >> Edit Database Properties >> Log Settings
Change the 50,000 entries change that to 10,000 or 5000
The traffic Logs would be set for 60 days change that to 10 days
Then it should bring down the size.
Regards,