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…alled on a model instance (a row of the table is updated or a new row is added) or when `delete` is called on a model instance (a row of the table is deleted), a signal is issued and the `invalidate_cache` …
…ation — and I could afford it on a part-time waitressing salary. This time, I had the good sense to grab my chance at college with both hands. I got my degree and I got to live my dream: I became a teache…