I'm missing something.  I have a table where I want to react to changes to 
a particular field.  I'm trying to use the _after_update callback check for 
this.  However, using this it appears to me that I am only seeing the data 
values after the update.  I can't see what they were before the update so I 
don't know which fields we actually updated.  Is there a 'bef'ore' buffer 
available that I'm missing?  I'm trying to capture changes made using a 
smartgrid.  Any tips would be appreciated.

-Jim

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