Updating relationships
Actually, to clarify, I want to be able to query and get:
widget,batch,instruction,tool
A,66,1,WidgetStomper
A,66,2,WidgetPresser
A,99,3,WidgetHeater
A,99,4,WidgetFreezer
I really want to be able to see what tool each widget has gone through, but
we only track what goes into a tool by batch.
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