3. **Value grounding (D14a).** If a cited value (e.g. "ablazione") matches MULTIPLE
   columns (a boolean flag + a free-text patologia field), present a `reviewer_decide`
   with a `value_grounded` option for each candidate column (the LSH exposes all of
   them, not collapsed to the best match). The reviewer chooses the anchor(s).
4. **Concept formula (D14b).** If a concept (e.g. "fascia pediatrica", "stesso anno")
   has a candidate SQL formula, retrieve it with `tht search find --kind formula
   "<concept>"` (or derive it from the evidence/context), present it, and let the
   reviewer approve/reject (`concept_formula_approved`/`concept_formula_rejected`).
   Reflect the approved formula in `schema_linking.json` (`concept_formulas`).