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PUT /api/measurements/[id] was the one write surface that skipped the per-type plausibility bands — POST, batch, CSV import, Apple export, Telegram and MCP all enforce VALUE_RANGES — so an implausible edited value flowed unchecked into rollups, the health score, the BP gates and the Coach snapshot. The route now validates the new value against the row's own type after the lookup and returns the standard multi-issue 422 envelope on violation. Value edits on server-owned sources (anything outside WRITABLE_MEASUREMENT_SOURCES: connector, import, computed rows) are refused with 409 and the stable errorCode measurement.update.server_owned_source — editing a provider-attributed number forges a reading the server never received. Timestamp and note edits stay allowed, and the edit sheet shows a localised message for the new code. The schema's generic min(0).max(500000) bound is dropped: the per-type band is stricter where it matters, and min(0) blocked legitimate edits of the signed types (ANS_CHARGE, BODY_TEMPERATURE_DEVIATION). Route tests cover out-of-range 422, negative signed-type accept, the server-owned 409, a timestamp-only edit on a server-owned row, and the happy path. The PUT endpoint is not part of the published OpenAPI surface — the generated contract is unchanged.