Deletion reach

The set of derivatives a deletion request can actually reach and destroy. Embeddings, summaries, classifications, extracted entities, behavioral profiles, and training corpora are all derived from a source, and each one is inside the reach only if engineering connects it back to the source row that a person can ask to have erased. A derivative outside the reach converts a reversible act into a permanent one on the subject’s behalf and without telling them, which yields the rule the term exists to carry: if the derivative cannot be deleted, it must not be created. The test is applied before the derivative is built, by writing down how it dies, because a system that discovers the question when a person exercises a right has already made the answer no.