What you might be looking for exists in the Evt_NS_Item_Management table in your Symantec_CMDB database. This table highlights the action (e.g., Run, Delete, Modify, ...) taken against an object in the NS (e.g., Filter, Collection, Report, ...) and by whom. You will likely have to disregard records where the User field equals your SMP admin account.
SELECT [_id]
,[_ResourceGuid]
,[_eventTime]
,[_forward]
,[ItemGuid]
,[ItemName]
,[ItemAttributes]
,[User]
,[Action]
,[ItemClassGuid]
,[ResourceTypeGuid]
,[Description]
FROM [Symantec_CMDB_Prod].[dbo].[Evt_NS_Item_Management]
ORDER BY
_eventTime DESC