In the Zenoss eventsDB there is a table called 'details'. Maybe you wondered what this table contains. The detail table is used to store the extra fields of events that you see on the Detail tab when you click the magnifying glass on an event. These would include SNMP trap varbinds as well as any other fields you extract from events using event mapping rules.
Wouter posted a new tip explaining in greater detail what it is and how you might manage the size of the table: