We encountered a problem during an export/import in a Zope 3 based application 
that resulted in something not being importable. This is from our very first 
Zope 3 based application, and I stumbled across some very old adapter/utility 
registrations that I thought I had cleared out. There are references to 
`zope.interface.adapter.Null` which haven't been around for years. This is in 
an old `LocalAdapterRegistry` which, again, I thought I had removed along time 
ago. These objects and what they reference are not part of our normal object 
graph, and I was surprised to see them.

Given an oid, how can I trace what references that object/oid? There is 
something in our normal object hierarchy retaining a reference, but I don't 
know how to find it, and imagine that trying to investigate/load the objects 
from the ZODB level will help me find the culprit.

Are there low level deletion tools in the ZODB to delete individual objects?

For more information about ZODB, see the ZODB Wiki:

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