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Build a very simple magento extension that should be able to do the following :
1- Set the value of an attribute based on the combined quantity of a configurable product.
2-The combined quantity of a configurable product is the sum of quantities of its children.
3-The extension should allow you in the backend to control its behavior that includes setting the threshold and the attribute values.
4-The extension can be triggered from a cron job
Set the values of the attribute adwords_labels as follow:
if (combined quantity >= 7) = high
if (combined quantity >= 4) = mid
if (combined quantity <= 4) = low
The extension should have a run button in the backend for manual runs.
Of course everything should be open source.