if the pessimistic listener doesn't work, maybe he could do something like 
this:

* create an event listener to grab the sql executes
* wrap the execute in try/except with a savepoint

savepoint()
while True :
    try:
        execute()
        break
    except:  
        rollback()
        fails += 1
        if fails >= FAIL_MAX:
           raise MaxFailsError()

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