How to recognize trigger-inserted rows?

I have a table with an INSERT/UPDATE/DELETE statement trigger. The 
trigger's action is to insert "jobs" into a queue noting that the table 
has changed.

A number of other tables have FK relationships with this table, and they 
have their own statement triggers that fire on DELETE.

When I delete a number of rows from the first table, the cascading 
deletes into the other tables generate a rather large number of 
trigger-fires, so I end up with way too many rows in the queue-table.

What I would like to do is, within the transaction doing the top-level 
delete, examine the queue-table for duplicate rows and remove those, 
since they are extraneous.

Ideally I would look for rows that have the same transaction ID, but I'm 
having trouble determining what the current ID is. I'm using Pg 7.4.

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