{
  "id": "inference/cohort-narrowing",
  "regime": "resistance",
  "profile": "GACS-I1",
  "claim": "inference-control",
  "harness": "query",
  "policy": "policies/mask-email.json",
  "query": "SELECT city, count(*) FROM public.customers GROUP BY city",
  "expectedStatus": "NOT_COVERED",
  "expectedFail": true,
  "rationale": "Grouping on an allowed column yields cohort sizes. Combined with other filters this narrows identity.",
  "doesNotTest": "Whether a particular cohort is unique in a real table; that needs data."
}