Rank Meta audience segments and suggest where budget should go

Ranks the segments of one audience dimension against the account average on the metric that matches the objective: ROAS where revenue exists, otherwise cost per result. Says which segments are worth more budget, which are dragging, and which are simply too small to judge. Use when: the user wants a decision, not a table — "who should we target", "what should we cut". Do not use it as authority to exclude a demographic without the user's agreement: special ad categories forbid some exclusions outright, and a narrow exclusion often raises costs everywhere else. Do not act on a segment with almost no spend; those keep a neutral verdict on purpose. Returns the ranking with each segment's share of spend, how far it is from the average, and a one-line recommendation. It writes nothing: applying a change is meta_update_ad_set. Rows Meta labels "unknown" are excluded from the ranking and reported separately.