Update properties of zodb objects from a celery task via pyramid_celery not working

So in my content system (based on substanced) I set the name of the zodb 
content item programatically based on the values of other properties of 
that object. Some of the child elements of this content item are named 
based on their parent. I need to programitically update the names of the 
children too. 
If I do this from within the set function of the Property of the parent 
object then it works but it is slow. Instead I am trying to run it 
afterwards using celery. I use very similar code but it doesn't update the 
child object name. Any ideas?

The code I am using to update the zodb object is

                 new_name = 
agent_artifact_ref_name_calc_value(content_ob.__parent__, struct_ref)
                 struct_artifact_ref = get_properties(content_ob, registry)
                 struct_artifact_ref[u'name'] = new_name
                 setattr(content_ob, 'name', new_name)
                 transaction.commit
   
Indexing the zodb is slow so it is deferred and the deferred process is run 
by supervisor which is run every 5 seconds.

The celery task to update the children is run from an event which is 
triggered after the parent object is updated.  I have delayed this task so 
that it is run after the parent object is re-indexed.  I can pick the 
correct child objects by querying the catalog. I then update the names of 
the objects. In substanced changing the name of an object is equivalent to 
a remove and then an add. Changing the name of the child object triggers 
all the reindex methods for the catalog but doesn't seem to pick up the 
change in the name.

Any ideas?

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