diff --git a/src/__tests__/client-route-zod-guard.test.ts b/src/__tests__/client-route-zod-guard.test.ts
index e50290239..ad2f39e9a 100644
--- a/src/__tests__/client-route-zod-guard.test.ts
+++ b/src/__tests__/client-route-zod-guard.test.ts
@@ -1,5 +1,6 @@
 /**
- * The documents vault and the Coach load no schema library in the browser.
+ * The documents vault, the Coach and the metric pages load no schema library
+ * in the browser.
  *
  * Both routes reached zod through a constant: the list of document kinds, the
  * bulk limit, the attachment cap, the Coach data clusters, a conversation
@@ -121,6 +122,11 @@ describe("client routes without the schema library", () => {
     "src/app/documents/page.tsx",
     "src/app/coach/page.tsx",
     "src/app/coach/conversations/page.tsx",
+    // The metric sub-pages read the plausibility band through the value
+    // domain (`src/lib/measurements/value-ranges.ts`), and the values list
+    // checks its segment against the type label map.
+    "src/app/insights/pulse/page.tsx",
+    "src/app/insights/values/[type]/page.tsx",
   ]) {
     it(`${route} ships no zod in its static client graph`, () => {
       const hits = clientZodImports(route);
diff --git a/src/app/insights/values/[type]/page.tsx b/src/app/insights/values/[type]/page.tsx
index e54f9868c..0f9c25633 100644
--- a/src/app/insights/values/[type]/page.tsx
+++ b/src/app/insights/values/[type]/page.tsx
@@ -8,8 +8,8 @@ import {
   INSIGHTS_OVERVIEW,
   resolveValuesBackHref,
 } from "@/lib/insights/values-back-link";
-import { measurementTypeEnum } from "@/lib/validations/measurement";
 import { MEASUREMENT_TYPE_LABEL_KEYS } from "@/components/measurements/measurement-list-meta";
+import { MEASUREMENT_TYPE_LABEL_KEYS as EVERY_MEASUREMENT_TYPE } from "@/lib/measurements/type-label-keys";
 import { BackLink } from "@/components/ui/back-link";
 import { MeasurementList } from "@/components/measurements/measurement-list";
 import { SubPageShell } from "@/components/insights/sub-page-shell";
@@ -38,8 +38,11 @@ export default function InsightsMetricValuesPage({
   const searchParams = useSearchParams();
 
   // Reject any segment that is not a real MeasurementType so a typo'd
-  // deep-link 404s instead of mounting a blank list.
-  if (!measurementTypeEnum.options.includes(type as never)) {
+  // deep-link 404s instead of mounting a blank list. The leaf label map is
+  // typed `Record<MeasurementType, string>`, so the compiler holds it to
+  // exactly the enum, and it answers the question without pulling the
+  // measurement schemas, and Zod, into the page.
+  if (!Object.hasOwn(EVERY_MEASUREMENT_TYPE, type)) {
     notFound();
   }
 
diff --git a/src/lib/measurements/plausibility-gate.ts b/src/lib/measurements/plausibility-gate.ts
index d079f5391..5fe8197da 100644
--- a/src/lib/measurements/plausibility-gate.ts
+++ b/src/lib/measurements/plausibility-gate.ts
@@ -1,7 +1,7 @@
 /**
  * The ingest-side half of the app's plausibility domain.
  *
- * `VALUE_RANGES` in `@/lib/validations/measurement` is the band the
+ * `VALUE_RANGES` in `@/lib/measurements/value-ranges` is the band the
  * application declares a metric can occupy — PULSE 20–300, WEIGHT 1–500,
  * SLEEP_DURATION 0–1440 minutes. Every path a person can drive enforces it:
  * the measurement routes, the batch endpoint, the CSV and Apple-export
@@ -46,7 +46,7 @@
  */
 import { annotate, getEvent } from "@/lib/logging/context";
 import { isPlausibleMetricValue } from "@/lib/measurements/value-domain";
-import { VALUE_RANGES } from "@/lib/validations/measurement";
+import { VALUE_RANGES } from "@/lib/measurements/value-ranges";
 
 /**
  * Stable meta key the tally lands under. Pinned so dashboards can count it
diff --git a/src/lib/measurements/value-domain.ts b/src/lib/measurements/value-domain.ts
index 1ae492854..eb0021bcd 100644
--- a/src/lib/measurements/value-domain.ts
+++ b/src/lib/measurements/value-domain.ts
@@ -10,7 +10,7 @@
  *      same question, two answers. The fact is a property of the METRIC, not
  *      of the surface that renders it, so it belongs beside the metric — and
  *      it is already declared there: `VALUE_RANGES` in
- *      `@/lib/validations/measurement` is the app-wide plausibility domain
+ *      `@/lib/measurements/value-ranges` is the app-wide plausibility domain
  *      every ingest path validates against, and its `min` IS the metric's
  *      floor. Nothing new to maintain; this module only reads it. Two types
  *      declare a genuinely signed floor (`ANS_CHARGE`,
@@ -30,7 +30,7 @@
  * real quantity too, but a step is indivisible, so the metric is read as a
  * count and rendered as one.
  */
-import { VALUE_RANGES } from "@/lib/validations/measurement";
+import { VALUE_RANGES } from "@/lib/measurements/value-ranges";
 
 /**
  * Decimal places used for a metric with no discreteness constraint — the
diff --git a/src/lib/measurements/value-ranges.ts b/src/lib/measurements/value-ranges.ts
new file mode 100644
index 000000000..e37d1eba7
--- /dev/null
+++ b/src/lib/measurements/value-ranges.ts
@@ -0,0 +1,259 @@
+/**
+ * The plausibility band each measurement type may occupy, and the check every
+ * ingest path runs against it. Zod-free on purpose: the value-domain facts
+ * (`value-domain.ts`) read the band on the client, and this module keeps that
+ * read from pulling the measurement schemas, and Zod with them, into every
+ * metric page. `@/lib/validations/measurement` re-exports both for the
+ * server-side writers.
+ */
+
+// Plausible ranges per measurement type
+export const VALUE_RANGES: Record<string, { min: number; max: number }> = {
+  WEIGHT: { min: 1, max: 500 },
+  BLOOD_PRESSURE_SYS: { min: 40, max: 300 },
+  BLOOD_PRESSURE_DIA: { min: 20, max: 200 },
+  PULSE: { min: 20, max: 300 },
+  BODY_FAT: { min: 1, max: 80 },
+  // Minutes (v1.4.23 unit change). Per-stage rows can run from a few
+  // seconds (a brief awakening) to 600+ minutes (a long IN_BED block),
+  // so the upper bound covers a 24-hour day.
+  SLEEP_DURATION: { min: 0, max: 1440 },
+  ACTIVITY_STEPS: { min: 0, max: 200000 },
+  BLOOD_GLUCOSE: { min: 20, max: 800 }, // mg/dL — covers severe hypo to severe hyperglycemia
+  TOTAL_BODY_WATER: { min: 5, max: 100 }, // kg of water — adults typically 30–55 kg
+  BONE_MASS: { min: 0.5, max: 8 }, // kg — adult plausibility (typical 2.5–4.5 kg)
+  // Pulse oximetry (SpO2). BTS Guideline 2017 + ATS clinical practice put the
+  // healthy resting range at 95–100%. We accept down to 50% so a faulty-sensor
+  // critically-low reading still gets logged for the doctor to see; below 50%
+  // is incompatible with sustained life and almost certainly a sensor glitch.
+  OXYGEN_SATURATION: { min: 50, max: 100 },
+  // ── v1.4.23 Apple Health ranges ──
+  // HRV SDNN ms — Apple's own "high HRV" threshold sits ~80 ms; lows can
+  // reach 5–10 ms in stressed/sick samples. 200 ms is a generous upper
+  // bound for unusually relaxed athletic windows.
+  HEART_RATE_VARIABILITY: { min: 1, max: 200 },
+  // Resting HR bpm — endurance athletes can reach the high 30s; severe
+  // tachycardia caps below 220.
+  RESTING_HEART_RATE: { min: 25, max: 220 },
+  // Active energy kcal/sample — a daily-rollup sample tops out around
+  // 6–8000 kcal even for ultra-endurance days.
+  ACTIVE_ENERGY_BURNED: { min: 0, max: 10000 },
+  // Flights — vertical-feet/3 ≈ flights; cap generous.
+  FLIGHTS_CLIMBED: { min: 0, max: 1000 },
+  // Walking/running distance per sample (metres). 200 km covers an
+  // ultra-marathon or a multi-stage day.
+  WALKING_RUNNING_DISTANCE: { min: 0, max: 200000 },
+  // VO2 max mL/(kg·min) — elite endurance hovers ~85; sedentary floor ~10.
+  VO2_MAX: { min: 5, max: 100 },
+  // Body temperature °C — survivable lows ~28; severe hyperthermia ~45.
+  BODY_TEMPERATURE: { min: 28, max: 45 },
+  // ── v1.4.25 W5d Withings full coverage ──
+  // Fat-free mass kg — adult plausibility, ~30 kg (small adult) to 120 kg
+  // (large lean athlete). Same bounds as weight minus a fat-mass floor.
+  FAT_FREE_MASS: { min: 10, max: 250 },
+  // Fat mass kg — pairs with FAT_FREE_MASS so totals reconcile to weight.
+  FAT_MASS: { min: 0, max: 250 },
+  // Muscle mass kg — sub-component of fat-free mass; widest sensible bound.
+  MUSCLE_MASS: { min: 5, max: 200 },
+  // Skin temperature °C — surface temps run cooler than core. ScanWatch's
+  // dermal sensor reports a relative offset that lands in the 25–40 °C
+  // band; treat anything outside as a sensor glitch.
+  SKIN_TEMPERATURE: { min: 20, max: 45 },
+  // Pulse-wave velocity m/s — clinical ranges sit ~4–15 m/s. Higher
+  // numbers indicate stiffer arteries (cardiovascular risk).
+  PULSE_WAVE_VELOCITY: { min: 1, max: 30 },
+  // Vascular age in years — Withings derives this from PWV + chronological
+  // age; the value is a "biological age" not a chronological one. Hard cap
+  // at 130 because that's the human longevity record.
+  VASCULAR_AGE: { min: 10, max: 130 },
+  // Visceral fat rating 1–12 (Withings' own scale; not a percent).
+  VISCERAL_FAT: { min: 0, max: 30 },
+  // ── v1.4.25 W8d Apple Health server-prep ──
+  // Audio exposure dBA — Apple's "loud audio" warning sits at 80 dBA;
+  // concerts run 100–115 dBA; 140 dBA is the pain threshold. The floor
+  // of 30 dBA covers a quiet bedroom; anything below is silence and
+  // almost certainly a sensor artefact.
+  AUDIO_EXPOSURE_ENV: { min: 30, max: 140 },
+  // Headphone audio caps slightly below the open-air upper edge because
+  // sealed-driver listening physically cannot reach a concert PA's SPL.
+  AUDIO_EXPOSURE_HEADPHONE: { min: 30, max: 140 },
+  // Time in daylight (minutes/day) — full 24-hour window. Outdoor work
+  // tops the range; sedentary indoor days sit near 0.
+  TIME_IN_DAYLIGHT: { min: 0, max: 1440 },
+  // ── v1.5.5 iOS-coord additions ──
+  // Respiratory rate breaths/min — adult range ~12-20 at rest; severe
+  // distress can spike past 40; bradypnea floor ~4. Generous bounds.
+  RESPIRATORY_RATE: { min: 3, max: 60 },
+  // BMI kg/m² — sub-12 is starvation-class, 70 covers extreme obesity.
+  // Outside the band is almost certainly a height-or-weight typo.
+  BODY_MASS_INDEX: { min: 8, max: 70 },
+  // Lean body mass kg — adult plausibility, ~25 kg (small adult) to
+  // 150 kg (extreme lean athlete). Same shape as FAT_FREE_MASS.
+  LEAN_BODY_MASS: { min: 10, max: 250 },
+  // Walking heart rate average bpm — endurance athletes can sit in
+  // the high 70s while walking; ailing or post-stimulant readings can
+  // touch 200. Same upper bound as the spot PULSE / RESTING_HEART_RATE.
+  WALKING_HEART_RATE_AVERAGE: { min: 30, max: 220 },
+  // Gait percent (0-100). Apple ships these as 0..1 fractions; after
+  // the ×100 server-side scaling the canonical band is 0..100.
+  WALKING_ASYMMETRY: { min: 0, max: 100 },
+  WALKING_DOUBLE_SUPPORT: { min: 0, max: 100 },
+  // Same ×100-scaled 0..100 percent as its two gait siblings above. The
+  // entry was simply missing; the map is the app's plausibility domain AND
+  // (via `value-domain.ts`) the answer to "can this metric be negative",
+  // so an omission reads as "unknown" on both questions.
+  WALKING_STEADINESS: { min: 0, max: 100 },
+  // ── v1.5.5 iOS-coord follow-up — raw-SI gait pair ──
+  // Step length (metres) — adult walking sits around 0.5–0.8 m; the
+  // 0.1 floor captures shuffling gait and the 2.0 ceiling covers
+  // unusually tall sprinters without catching obvious sensor noise.
+  WALKING_STEP_LENGTH: { min: 0.1, max: 2.0 },
+  // Walking speed (m/s) — healthy adult casual gait ≈ 1.2–1.4 m/s;
+  // brisk walking tops out near 2.2 m/s before transitioning to a
+  // run. The 0.1 floor captures a very slow shuffle; 3.0 covers
+  // race-walking record territory.
+  WALKING_SPEED: { min: 0.1, max: 3.0 },
+  // ── v1.10.0 — additive HealthKit signals (WX-A) ──
+  // Cardio recovery (bpm) — the one-minute HR drop after peak exertion.
+  // Trained athletes can drop 50+ bpm; an unfit or autonomically
+  // impaired recovery sits in the single digits. 0 is a flat (poor)
+  // recovery; 100 is a generous ceiling beyond any plausible reading.
+  CARDIO_RECOVERY: { min: 0, max: 100 },
+  // Wrist temperature (°C) — overnight skin-side reading. Runs cooler
+  // than core; the 30–42 band covers the plausible nighttime range and
+  // rejects obvious sensor glitches. Same shape as SKIN_TEMPERATURE.
+  WRIST_TEMPERATURE: { min: 30, max: 42 },
+  // Fall count — a daily tally. A handful in a bad day is plausible;
+  // 50 is a generous ceiling that still catches a runaway sensor.
+  FALL_COUNT: { min: 0, max: 50 },
+  // Six-minute-walk distance (metres). Healthy adults walk ~400–700 m;
+  // the 50 m floor captures severe impairment and the 1000 m ceiling
+  // covers an unusually fit reading without admitting sensor noise.
+  SIX_MINUTE_WALK_DISTANCE: { min: 50, max: 1000 },
+  // Stair gait speed (m/s) — slower than level walking. Adult stair
+  // ascent sits around 0.4–0.7 m/s, descent slightly faster. The 0.05
+  // floor captures a very slow climb; 2.0 is well above any sustained
+  // stair pace and rejects a free-fall artefact.
+  STAIR_ASCENT_SPEED: { min: 0.05, max: 2.0 },
+  STAIR_DESCENT_SPEED: { min: 0.05, max: 2.0 },
+  // Breathing-disturbance index (count). A per-night index; 0 is an
+  // undisturbed night and the 1000 ceiling is generous headroom over
+  // any plausible severe-apnea night.
+  BREATHING_DISTURBANCES: { min: 0, max: 1000 },
+  // ── v1.10.0 — categorical events (WX-B) ──
+  // EVENT rows carry a fixed `value = 1` (one fired event). The range pins
+  // the value so a malformed ingest (value 0, or a stray sensor number)
+  // is rejected rather than stored as a phantom event.
+  IRREGULAR_RHYTHM_NOTIFICATION: { min: 1, max: 1 },
+  HIGH_HEART_RATE_EVENT: { min: 1, max: 1 },
+  LOW_HEART_RATE_EVENT: { min: 1, max: 1 },
+  WALKING_STEADINESS_EVENT: { min: 1, max: 1 },
+  BREATHING_DISTURBANCE_EVENT: { min: 1, max: 1 },
+  // Loud-listening event flag (env + headphone). One fired event per row, so
+  // the floor is 1 — a non-event is not stored. The entry was missing from
+  // the map entirely, which let ANY number through ingest, including a
+  // negative one. The ceiling stays generous rather than pinned at 1 like the
+  // five events above: this type is written only by the iOS client and
+  // nothing in this repo asserts the exact value, so the floor is the part
+  // that is certain.
+  AUDIO_EXPOSURE_EVENT: { min: 1, max: 1000 },
+  // ── v1.10.0 — computed scores (WX-C) ──
+  // Server-derived 0–100 scores. The plausibility band pins them to the
+  // score range so a malformed store (a stray negative or > 100) is rejected.
+  RECOVERY_SCORE: { min: 0, max: 100 },
+  STRESS_SCORE: { min: 0, max: 100 },
+  STRAIN_SCORE: { min: 0, max: 100 },
+  // ── v1.11.0 — WHOOP-native score classes ──
+  // RMSSD HRV (ms). Lows reach single digits in stressed samples. RMSSD runs
+  // higher than SDNN in relaxed, well-trained sleepers, and nightly readings
+  // above 200 ms are real (#1110), so the ceiling sits at 300 ms.
+  HRV_RMSSD: { min: 1, max: 300 },
+  // Day / workout strain on WHOOP's bounded 0–21 scale.
+  DAY_STRAIN: { min: 0, max: 21 },
+  WORKOUT_STRAIN: { min: 0, max: 21 },
+  // Sleep quality percentages (0–100).
+  SLEEP_PERFORMANCE: { min: 0, max: 100 },
+  SLEEP_EFFICIENCY: { min: 0, max: 100 },
+  SLEEP_CONSISTENCY: { min: 0, max: 100 },
+  // Recommended sleep duration in minutes — 0..1440 covers the 24-hour day.
+  SLEEP_NEED: { min: 0, max: 1440 },
+  // Day energy expenditure in kJ — 50 000 kJ (~12 000 kcal) is a generous
+  // ceiling over any plausible ultra-endurance day.
+  ENERGY_EXPENDITURE_KJ: { min: 0, max: 50000 },
+  // ── v1.12.8 — WHOOP cycle + sleep coverage completion ──
+  // Daily average / max heart rate bpm — same plausibility band as the
+  // spot PULSE: endurance athletes touch the 30s at rest, severe
+  // tachycardia caps below 300.
+  AVERAGE_HEART_RATE: { min: 20, max: 300 },
+  MAX_HEART_RATE: { min: 20, max: 300 },
+  // Per-night sleep disturbance count — 0 is an undisturbed night; 200 is a
+  // generous ceiling over any plausible severely-fragmented night.
+  SLEEP_DISTURBANCE_COUNT: { min: 0, max: 200 },
+  // ── v1.17.1 — Polar Nightly Recharge + Training Load Pro components ──
+  // ANS charge is a baseline-relative autonomic deviation that can run
+  // negative; a generous symmetric ±100 band covers any plausible reading.
+  // Cardio Load is a non-negative cumulative-strain figure; 1000 is a generous
+  // ceiling over any plausible single-day training load.
+  ANS_CHARGE: { min: -100, max: 100 },
+  CARDIO_LOAD: { min: 0, max: 1000 },
+  // ── v1.17.1 — Oura coverage completion ──
+  // Sleep Score (0–100), same band as the other score classes.
+  SLEEP_SCORE: { min: 0, max: 100 },
+  // Body-temperature deviation (°C) — a signed nightly offset centred on 0.
+  // Oura clamps its own display near ±1 °C; ±5 °C is a generous band that
+  // rejects an obvious sensor glitch while keeping every real illness /
+  // luteal-phase swing.
+  BODY_TEMPERATURE_DEVIATION: { min: -5, max: 5 },
+  // ── v1.19.0 — Oura resilience ──
+  // Ordinal level scale: 1 (limited) … 5 (exceptional). The closed encoding
+  // never falls outside this band.
+  RESILIENCE: { min: 1, max: 5 },
+  // ── v1.25 — clinical-signals wave ──
+  // PHQ-9 total 0–27, GAD-7 total 0–21 — server-derived from the screener.
+  PHQ9_SCORE: { min: 0, max: 27 },
+  GAD7_SCORE: { min: 0, max: 21 },
+  // ── v1.27.9 — screening scores. WHO-5 reported percentage 0–100 (raw × 4),
+  // SCI total 0–32 — both server-derived, higher = better.
+  WHO5_SCORE: { min: 0, max: 100 },
+  SCI_SCORE: { min: 0, max: 32 },
+  // ── v1.44 — the minute rings and mindful minutes are bounded by the day;
+  // a row is one sample or one day's total, never more than 1440 minutes.
+  EXERCISE_MINUTES: { min: 0, max: 1440 },
+  STAND_MINUTES: { min: 0, max: 1440 },
+  MINDFUL_MINUTES: { min: 0, max: 1440 },
+  // Stood hours: 1 per hour sample, at most 24 on a day's total.
+  STAND_HOURS: { min: 0, max: 24 },
+  // State of Mind valence: HealthKit's closed −1..1 scale.
+  STATE_OF_MIND_VALENCE: { min: -1, max: 1 },
+  // AFib burden as a percent of the week, after the ×100 scaling. A client
+  // that already scaled sends 2 for 2 %, which lands at 200 and is refused.
+  AFIB_BURDEN: { min: 0, max: 100 },
+  // ── v1.44 — room climate. CO2: outdoor air sits near 420 ppm and a closed
+  // bedroom can pass 3000; consumer sensors top out at 5000–10000 ppm.
+  INDOOR_CO2: { min: 0, max: 10000 },
+  // Indoor air °C: a cold cellar to an overheated attic.
+  INDOOR_TEMPERATURE: { min: -20, max: 60 },
+  // Relative humidity, percent.
+  INDOOR_HUMIDITY: { min: 0, max: 100 },
+  // Grip strength kg — a child can read in the single digits, an elite athlete
+  // tops ~90 kg; 120 is a generous ceiling that still rejects sensor noise.
+  GRIP_STRENGTH: { min: 0, max: 120 },
+  // Pain NRS — the validated 0–10 scale; the closed band pins the integer.
+  PAIN_NRS: { min: 0, max: 10 },
+  // Waist circumference cm — paediatric lows ~30, severe obesity ~250.
+  WAIST_CIRCUMFERENCE: { min: 30, max: 250 },
+  // Waist-to-height ratio — dimensionless; healthy ~0.4–0.5, the band is
+  // generous either side to admit any plausible body habitus.
+  WAIST_TO_HEIGHT: { min: 0.2, max: 1.5 },
+};
+
+export function validateMeasurementRange(
+  type: string,
+  value: number,
+): string | null {
+  const range = VALUE_RANGES[type];
+  if (range && (value < range.min || value > range.max)) {
+    return `Value must be between ${range.min} and ${range.max}`;
+  }
+  return null;
+}
diff --git a/src/lib/validations/measurement.ts b/src/lib/validations/measurement.ts
index fa6a5692b..93f9322de 100644
--- a/src/lib/validations/measurement.ts
+++ b/src/lib/validations/measurement.ts
@@ -243,256 +243,14 @@ export const USER_CORRECTABLE_MEASUREMENT_SOURCES = [
 // display transform can read it without pulling Zod into every chart route.
 export { getUnitForType } from "@/lib/measurements/unit-map";
 
-// Plausible ranges per measurement type
-export const VALUE_RANGES: Record<string, { min: number; max: number }> = {
-  WEIGHT: { min: 1, max: 500 },
-  BLOOD_PRESSURE_SYS: { min: 40, max: 300 },
-  BLOOD_PRESSURE_DIA: { min: 20, max: 200 },
-  PULSE: { min: 20, max: 300 },
-  BODY_FAT: { min: 1, max: 80 },
-  // Minutes (v1.4.23 unit change). Per-stage rows can run from a few
-  // seconds (a brief awakening) to 600+ minutes (a long IN_BED block),
-  // so the upper bound covers a 24-hour day.
-  SLEEP_DURATION: { min: 0, max: 1440 },
-  ACTIVITY_STEPS: { min: 0, max: 200000 },
-  BLOOD_GLUCOSE: { min: 20, max: 800 }, // mg/dL — covers severe hypo to severe hyperglycemia
-  TOTAL_BODY_WATER: { min: 5, max: 100 }, // kg of water — adults typically 30–55 kg
-  BONE_MASS: { min: 0.5, max: 8 }, // kg — adult plausibility (typical 2.5–4.5 kg)
-  // Pulse oximetry (SpO2). BTS Guideline 2017 + ATS clinical practice put the
-  // healthy resting range at 95–100%. We accept down to 50% so a faulty-sensor
-  // critically-low reading still gets logged for the doctor to see; below 50%
-  // is incompatible with sustained life and almost certainly a sensor glitch.
-  OXYGEN_SATURATION: { min: 50, max: 100 },
-  // ── v1.4.23 Apple Health ranges ──
-  // HRV SDNN ms — Apple's own "high HRV" threshold sits ~80 ms; lows can
-  // reach 5–10 ms in stressed/sick samples. 200 ms is a generous upper
-  // bound for unusually relaxed athletic windows.
-  HEART_RATE_VARIABILITY: { min: 1, max: 200 },
-  // Resting HR bpm — endurance athletes can reach the high 30s; severe
-  // tachycardia caps below 220.
-  RESTING_HEART_RATE: { min: 25, max: 220 },
-  // Active energy kcal/sample — a daily-rollup sample tops out around
-  // 6–8000 kcal even for ultra-endurance days.
-  ACTIVE_ENERGY_BURNED: { min: 0, max: 10000 },
-  // Flights — vertical-feet/3 ≈ flights; cap generous.
-  FLIGHTS_CLIMBED: { min: 0, max: 1000 },
-  // Walking/running distance per sample (metres). 200 km covers an
-  // ultra-marathon or a multi-stage day.
-  WALKING_RUNNING_DISTANCE: { min: 0, max: 200000 },
-  // VO2 max mL/(kg·min) — elite endurance hovers ~85; sedentary floor ~10.
-  VO2_MAX: { min: 5, max: 100 },
-  // Body temperature °C — survivable lows ~28; severe hyperthermia ~45.
-  BODY_TEMPERATURE: { min: 28, max: 45 },
-  // ── v1.4.25 W5d Withings full coverage ──
-  // Fat-free mass kg — adult plausibility, ~30 kg (small adult) to 120 kg
-  // (large lean athlete). Same bounds as weight minus a fat-mass floor.
-  FAT_FREE_MASS: { min: 10, max: 250 },
-  // Fat mass kg — pairs with FAT_FREE_MASS so totals reconcile to weight.
-  FAT_MASS: { min: 0, max: 250 },
-  // Muscle mass kg — sub-component of fat-free mass; widest sensible bound.
-  MUSCLE_MASS: { min: 5, max: 200 },
-  // Skin temperature °C — surface temps run cooler than core. ScanWatch's
-  // dermal sensor reports a relative offset that lands in the 25–40 °C
-  // band; treat anything outside as a sensor glitch.
-  SKIN_TEMPERATURE: { min: 20, max: 45 },
-  // Pulse-wave velocity m/s — clinical ranges sit ~4–15 m/s. Higher
-  // numbers indicate stiffer arteries (cardiovascular risk).
-  PULSE_WAVE_VELOCITY: { min: 1, max: 30 },
-  // Vascular age in years — Withings derives this from PWV + chronological
-  // age; the value is a "biological age" not a chronological one. Hard cap
-  // at 130 because that's the human longevity record.
-  VASCULAR_AGE: { min: 10, max: 130 },
-  // Visceral fat rating 1–12 (Withings' own scale; not a percent).
-  VISCERAL_FAT: { min: 0, max: 30 },
-  // ── v1.4.25 W8d Apple Health server-prep ──
-  // Audio exposure dBA — Apple's "loud audio" warning sits at 80 dBA;
-  // concerts run 100–115 dBA; 140 dBA is the pain threshold. The floor
-  // of 30 dBA covers a quiet bedroom; anything below is silence and
-  // almost certainly a sensor artefact.
-  AUDIO_EXPOSURE_ENV: { min: 30, max: 140 },
-  // Headphone audio caps slightly below the open-air upper edge because
-  // sealed-driver listening physically cannot reach a concert PA's SPL.
-  AUDIO_EXPOSURE_HEADPHONE: { min: 30, max: 140 },
-  // Time in daylight (minutes/day) — full 24-hour window. Outdoor work
-  // tops the range; sedentary indoor days sit near 0.
-  TIME_IN_DAYLIGHT: { min: 0, max: 1440 },
-  // ── v1.5.5 iOS-coord additions ──
-  // Respiratory rate breaths/min — adult range ~12-20 at rest; severe
-  // distress can spike past 40; bradypnea floor ~4. Generous bounds.
-  RESPIRATORY_RATE: { min: 3, max: 60 },
-  // BMI kg/m² — sub-12 is starvation-class, 70 covers extreme obesity.
-  // Outside the band is almost certainly a height-or-weight typo.
-  BODY_MASS_INDEX: { min: 8, max: 70 },
-  // Lean body mass kg — adult plausibility, ~25 kg (small adult) to
-  // 150 kg (extreme lean athlete). Same shape as FAT_FREE_MASS.
-  LEAN_BODY_MASS: { min: 10, max: 250 },
-  // Walking heart rate average bpm — endurance athletes can sit in
-  // the high 70s while walking; ailing or post-stimulant readings can
-  // touch 200. Same upper bound as the spot PULSE / RESTING_HEART_RATE.
-  WALKING_HEART_RATE_AVERAGE: { min: 30, max: 220 },
-  // Gait percent (0-100). Apple ships these as 0..1 fractions; after
-  // the ×100 server-side scaling the canonical band is 0..100.
-  WALKING_ASYMMETRY: { min: 0, max: 100 },
-  WALKING_DOUBLE_SUPPORT: { min: 0, max: 100 },
-  // Same ×100-scaled 0..100 percent as its two gait siblings above. The
-  // entry was simply missing; the map is the app's plausibility domain AND
-  // (via `value-domain.ts`) the answer to "can this metric be negative",
-  // so an omission reads as "unknown" on both questions.
-  WALKING_STEADINESS: { min: 0, max: 100 },
-  // ── v1.5.5 iOS-coord follow-up — raw-SI gait pair ──
-  // Step length (metres) — adult walking sits around 0.5–0.8 m; the
-  // 0.1 floor captures shuffling gait and the 2.0 ceiling covers
-  // unusually tall sprinters without catching obvious sensor noise.
-  WALKING_STEP_LENGTH: { min: 0.1, max: 2.0 },
-  // Walking speed (m/s) — healthy adult casual gait ≈ 1.2–1.4 m/s;
-  // brisk walking tops out near 2.2 m/s before transitioning to a
-  // run. The 0.1 floor captures a very slow shuffle; 3.0 covers
-  // race-walking record territory.
-  WALKING_SPEED: { min: 0.1, max: 3.0 },
-  // ── v1.10.0 — additive HealthKit signals (WX-A) ──
-  // Cardio recovery (bpm) — the one-minute HR drop after peak exertion.
-  // Trained athletes can drop 50+ bpm; an unfit or autonomically
-  // impaired recovery sits in the single digits. 0 is a flat (poor)
-  // recovery; 100 is a generous ceiling beyond any plausible reading.
-  CARDIO_RECOVERY: { min: 0, max: 100 },
-  // Wrist temperature (°C) — overnight skin-side reading. Runs cooler
-  // than core; the 30–42 band covers the plausible nighttime range and
-  // rejects obvious sensor glitches. Same shape as SKIN_TEMPERATURE.
-  WRIST_TEMPERATURE: { min: 30, max: 42 },
-  // Fall count — a daily tally. A handful in a bad day is plausible;
-  // 50 is a generous ceiling that still catches a runaway sensor.
-  FALL_COUNT: { min: 0, max: 50 },
-  // Six-minute-walk distance (metres). Healthy adults walk ~400–700 m;
-  // the 50 m floor captures severe impairment and the 1000 m ceiling
-  // covers an unusually fit reading without admitting sensor noise.
-  SIX_MINUTE_WALK_DISTANCE: { min: 50, max: 1000 },
-  // Stair gait speed (m/s) — slower than level walking. Adult stair
-  // ascent sits around 0.4–0.7 m/s, descent slightly faster. The 0.05
-  // floor captures a very slow climb; 2.0 is well above any sustained
-  // stair pace and rejects a free-fall artefact.
-  STAIR_ASCENT_SPEED: { min: 0.05, max: 2.0 },
-  STAIR_DESCENT_SPEED: { min: 0.05, max: 2.0 },
-  // Breathing-disturbance index (count). A per-night index; 0 is an
-  // undisturbed night and the 1000 ceiling is generous headroom over
-  // any plausible severe-apnea night.
-  BREATHING_DISTURBANCES: { min: 0, max: 1000 },
-  // ── v1.10.0 — categorical events (WX-B) ──
-  // EVENT rows carry a fixed `value = 1` (one fired event). The range pins
-  // the value so a malformed ingest (value 0, or a stray sensor number)
-  // is rejected rather than stored as a phantom event.
-  IRREGULAR_RHYTHM_NOTIFICATION: { min: 1, max: 1 },
-  HIGH_HEART_RATE_EVENT: { min: 1, max: 1 },
-  LOW_HEART_RATE_EVENT: { min: 1, max: 1 },
-  WALKING_STEADINESS_EVENT: { min: 1, max: 1 },
-  BREATHING_DISTURBANCE_EVENT: { min: 1, max: 1 },
-  // Loud-listening event flag (env + headphone). One fired event per row, so
-  // the floor is 1 — a non-event is not stored. The entry was missing from
-  // the map entirely, which let ANY number through ingest, including a
-  // negative one. The ceiling stays generous rather than pinned at 1 like the
-  // five events above: this type is written only by the iOS client and
-  // nothing in this repo asserts the exact value, so the floor is the part
-  // that is certain.
-  AUDIO_EXPOSURE_EVENT: { min: 1, max: 1000 },
-  // ── v1.10.0 — computed scores (WX-C) ──
-  // Server-derived 0–100 scores. The plausibility band pins them to the
-  // score range so a malformed store (a stray negative or > 100) is rejected.
-  RECOVERY_SCORE: { min: 0, max: 100 },
-  STRESS_SCORE: { min: 0, max: 100 },
-  STRAIN_SCORE: { min: 0, max: 100 },
-  // ── v1.11.0 — WHOOP-native score classes ──
-  // RMSSD HRV (ms). Lows reach single digits in stressed samples. RMSSD runs
-  // higher than SDNN in relaxed, well-trained sleepers, and nightly readings
-  // above 200 ms are real (#1110), so the ceiling sits at 300 ms.
-  HRV_RMSSD: { min: 1, max: 300 },
-  // Day / workout strain on WHOOP's bounded 0–21 scale.
-  DAY_STRAIN: { min: 0, max: 21 },
-  WORKOUT_STRAIN: { min: 0, max: 21 },
-  // Sleep quality percentages (0–100).
-  SLEEP_PERFORMANCE: { min: 0, max: 100 },
-  SLEEP_EFFICIENCY: { min: 0, max: 100 },
-  SLEEP_CONSISTENCY: { min: 0, max: 100 },
-  // Recommended sleep duration in minutes — 0..1440 covers the 24-hour day.
-  SLEEP_NEED: { min: 0, max: 1440 },
-  // Day energy expenditure in kJ — 50 000 kJ (~12 000 kcal) is a generous
-  // ceiling over any plausible ultra-endurance day.
-  ENERGY_EXPENDITURE_KJ: { min: 0, max: 50000 },
-  // ── v1.12.8 — WHOOP cycle + sleep coverage completion ──
-  // Daily average / max heart rate bpm — same plausibility band as the
-  // spot PULSE: endurance athletes touch the 30s at rest, severe
-  // tachycardia caps below 300.
-  AVERAGE_HEART_RATE: { min: 20, max: 300 },
-  MAX_HEART_RATE: { min: 20, max: 300 },
-  // Per-night sleep disturbance count — 0 is an undisturbed night; 200 is a
-  // generous ceiling over any plausible severely-fragmented night.
-  SLEEP_DISTURBANCE_COUNT: { min: 0, max: 200 },
-  // ── v1.17.1 — Polar Nightly Recharge + Training Load Pro components ──
-  // ANS charge is a baseline-relative autonomic deviation that can run
-  // negative; a generous symmetric ±100 band covers any plausible reading.
-  // Cardio Load is a non-negative cumulative-strain figure; 1000 is a generous
-  // ceiling over any plausible single-day training load.
-  ANS_CHARGE: { min: -100, max: 100 },
-  CARDIO_LOAD: { min: 0, max: 1000 },
-  // ── v1.17.1 — Oura coverage completion ──
-  // Sleep Score (0–100), same band as the other score classes.
-  SLEEP_SCORE: { min: 0, max: 100 },
-  // Body-temperature deviation (°C) — a signed nightly offset centred on 0.
-  // Oura clamps its own display near ±1 °C; ±5 °C is a generous band that
-  // rejects an obvious sensor glitch while keeping every real illness /
-  // luteal-phase swing.
-  BODY_TEMPERATURE_DEVIATION: { min: -5, max: 5 },
-  // ── v1.19.0 — Oura resilience ──
-  // Ordinal level scale: 1 (limited) … 5 (exceptional). The closed encoding
-  // never falls outside this band.
-  RESILIENCE: { min: 1, max: 5 },
-  // ── v1.25 — clinical-signals wave ──
-  // PHQ-9 total 0–27, GAD-7 total 0–21 — server-derived from the screener.
-  PHQ9_SCORE: { min: 0, max: 27 },
-  GAD7_SCORE: { min: 0, max: 21 },
-  // ── v1.27.9 — screening scores. WHO-5 reported percentage 0–100 (raw × 4),
-  // SCI total 0–32 — both server-derived, higher = better.
-  WHO5_SCORE: { min: 0, max: 100 },
-  SCI_SCORE: { min: 0, max: 32 },
-  // ── v1.44 — the minute rings and mindful minutes are bounded by the day;
-  // a row is one sample or one day's total, never more than 1440 minutes.
-  EXERCISE_MINUTES: { min: 0, max: 1440 },
-  STAND_MINUTES: { min: 0, max: 1440 },
-  MINDFUL_MINUTES: { min: 0, max: 1440 },
-  // Stood hours: 1 per hour sample, at most 24 on a day's total.
-  STAND_HOURS: { min: 0, max: 24 },
-  // State of Mind valence: HealthKit's closed −1..1 scale.
-  STATE_OF_MIND_VALENCE: { min: -1, max: 1 },
-  // AFib burden as a percent of the week, after the ×100 scaling. A client
-  // that already scaled sends 2 for 2 %, which lands at 200 and is refused.
-  AFIB_BURDEN: { min: 0, max: 100 },
-  // ── v1.44 — room climate. CO2: outdoor air sits near 420 ppm and a closed
-  // bedroom can pass 3000; consumer sensors top out at 5000–10000 ppm.
-  INDOOR_CO2: { min: 0, max: 10000 },
-  // Indoor air °C: a cold cellar to an overheated attic.
-  INDOOR_TEMPERATURE: { min: -20, max: 60 },
-  // Relative humidity, percent.
-  INDOOR_HUMIDITY: { min: 0, max: 100 },
-  // Grip strength kg — a child can read in the single digits, an elite athlete
-  // tops ~90 kg; 120 is a generous ceiling that still rejects sensor noise.
-  GRIP_STRENGTH: { min: 0, max: 120 },
-  // Pain NRS — the validated 0–10 scale; the closed band pins the integer.
-  PAIN_NRS: { min: 0, max: 10 },
-  // Waist circumference cm — paediatric lows ~30, severe obesity ~250.
-  WAIST_CIRCUMFERENCE: { min: 30, max: 250 },
-  // Waist-to-height ratio — dimensionless; healthy ~0.4–0.5, the band is
-  // generous either side to admit any plausible body habitus.
-  WAIST_TO_HEIGHT: { min: 0.2, max: 1.5 },
-};
-
-export function validateMeasurementRange(
-  type: string,
-  value: number,
-): string | null {
-  const range = VALUE_RANGES[type];
-  if (range && (value < range.min || value > range.max)) {
-    return `Value must be between ${range.min} and ${range.max}`;
-  }
-  return null;
-}
+// The plausibility band per type, and its check, live in a Zod-free module so
+// the client's value-domain reads (the chart floor, the integer set) do not
+// pull Zod into every metric page.
+import { validateMeasurementRange } from "@/lib/measurements/value-ranges";
+export {
+  VALUE_RANGES,
+  validateMeasurementRange,
+} from "@/lib/measurements/value-ranges";
 
 export const createMeasurementSchema = z
   .object({