The 'sysevent' table logged 'Logout' events triggered by the 'guest' user.
This happens when the user session times-out then the system logs this logout event in the 'sysevent' table. The system logs-out the users due to session inactivity or whatever the other reasons, it triggers the logout event with the guest user profile.
If the user leaves the session in an inactive state for more than the defined 'glide.ui.session_timeout' minutes then the system triggers the logout event and logs this activity in 'sysevent' table.
The 'Parm1' in the record is the user ID of the logged-out user.
Few other scenarios are discussed in KB0724410