diff --git a/src/app/api/medications/[id]/compliance/route.ts b/src/app/api/medications/[id]/compliance/route.ts
index ef845778a..7f75efd1a 100644
--- a/src/app/api/medications/[id]/compliance/route.ts
+++ b/src/app/api/medications/[id]/compliance/route.ts
@@ -23,6 +23,7 @@ import {
   type CanonicalSchedule,
   type RecurrenceContext,
 } from "@/lib/medications/scheduling/recurrence";
+import { normaliseDoseWindows } from "@/lib/medications/scheduling/worker-helpers";
 import { assertMedicationOwnership } from "@/lib/medications/route-guards";
 import { userDayKey } from "@/lib/tz/format";
 
@@ -40,6 +41,8 @@ type MedicationScheduleRow = {
   scheduleType: "SCHEDULED" | "PRN" | "CYCLIC";
   cyclicOnWeeks: number | null;
   cyclicOffWeeks: number | null;
+  /** v1.15.18 — per-dose configurable on-time windows (persisted JSON). */
+  doseWindows: unknown;
 };
 
 /**
@@ -63,6 +66,7 @@ function toCanonicalForBands(
     scheduleType: s.scheduleType,
     cyclicOnWeeks: s.cyclicOnWeeks,
     cyclicOffWeeks: s.cyclicOffWeeks,
+    doseWindows: normaliseDoseWindows(s.doseWindows),
   };
   if (
     base.timesOfDay.length === 0 &&
diff --git a/src/lib/analytics/__tests__/compliance.test.ts b/src/lib/analytics/__tests__/compliance.test.ts
index 95ee18abd..a802f37b9 100644
--- a/src/lib/analytics/__tests__/compliance.test.ts
+++ b/src/lib/analytics/__tests__/compliance.test.ts
@@ -2819,4 +2819,51 @@ describe("tallyComplianceFromLedger — the unified % keystone", () => {
     expect(tally.taken).toBeGreaterThanOrEqual(3);
     expect(tally.rate).toBeGreaterThanOrEqual(90);
   });
+
+  // v1.15.18 W7 — the persisted per-dose window reaches the % through the
+  // SAME minter the history view + write path use. An 11:29 take that the
+  // default ±1h leaves ad-hoc (slot missed) is counted on-time once the
+  // morning slot carries an explicit 07:00–12:00 window.
+  it("the persisted doseWindows widens the on-time band feeding the %", () => {
+    const events = [
+      { scheduledFor: at(7, 0), takenAt: at(11, 29), skipped: false },
+      { scheduledFor: at(19, 0), takenAt: at(19, 0), skipped: false },
+    ];
+    // DEFAULT (no doseWindows): 11:29 is past the 11:00 cutoff → ad-hoc,
+    // morning slot missed.
+    const dflt = tallyComplianceFromLedger(
+      events,
+      twiceDaily,
+      ctxFor(),
+      from,
+      nowEvening,
+      nowEvening,
+    );
+    expect(dflt.missed).toBe(1);
+    expect(dflt.adHoc).toBe(1);
+
+    // WITH the persisted 07:00–12:00 window: 11:29 lands on-time, nothing
+    // missed, nothing orphaned.
+    const windowed: ComplianceSchedule[] = [
+      {
+        windowStart: "07:00",
+        windowEnd: "19:00",
+        daysOfWeek: null,
+        timesOfDay: ["07:00", "19:00"],
+        doseWindows: [{ timeOfDay: "07:00", start: "07:00", end: "12:00" }],
+      },
+    ];
+    const wt = tallyComplianceFromLedger(
+      events,
+      windowed,
+      ctxFor(),
+      from,
+      nowEvening,
+      nowEvening,
+    );
+    expect(wt.missed).toBe(0);
+    expect(wt.adHoc).toBe(0);
+    expect(wt.takenOnTime).toBe(2);
+    expect(wt.rate).toBe(100);
+  });
 });
diff --git a/src/lib/analytics/compliance.ts b/src/lib/analytics/compliance.ts
index d6f5c0d23..6d6723dd4 100644
--- a/src/lib/analytics/compliance.ts
+++ b/src/lib/analytics/compliance.ts
@@ -32,6 +32,7 @@ import {
   type ScheduleLike,
 } from "@/lib/medications/scheduling/cadence";
 import { streaksFromTimeline } from "@/lib/medications/scheduling/compliance";
+import { normaliseDoseWindows } from "@/lib/medications/scheduling/worker-helpers";
 import {
   reconstructDoseHistory,
   type HistoryIntake,
@@ -371,6 +372,15 @@ export interface ComplianceSchedule {
   scheduleType?: ScheduleType | null;
   cyclicOnWeeks?: number | null;
   cyclicOffWeeks?: number | null;
+  /**
+   * v1.15.18 — per-dose configurable on-time windows. Threaded onto the
+   * canonical schedule so `tallyComplianceFromLedger` builds the on-time band
+   * from the explicit `[start, end]` range — keeping the % exactly aligned with
+   * the dose-history view and the write/edit attribution (all consume the same
+   * minter). Accepts the raw persisted JSON (a full Prisma row drops straight
+   * in); `toCanonicalSchedule` normalises it via `normaliseDoseWindows`.
+   */
+  doseWindows?: unknown;
 }
 
 /**
@@ -499,6 +509,7 @@ function toCanonicalSchedule(
     scheduleType: s.scheduleType ?? "SCHEDULED",
     cyclicOnWeeks: s.cyclicOnWeeks ?? null,
     cyclicOffWeeks: s.cyclicOffWeeks ?? null,
+    doseWindows: normaliseDoseWindows(s.doseWindows),
   };
 }
 
diff --git a/src/lib/analytics/health-score-fast-path.ts b/src/lib/analytics/health-score-fast-path.ts
index b20902e20..c746367eb 100644
--- a/src/lib/analytics/health-score-fast-path.ts
+++ b/src/lib/analytics/health-score-fast-path.ts
@@ -332,6 +332,9 @@ export async function computeUserHealthScoreFastPath(
             scheduleType: true,
             cyclicOnWeeks: true,
             cyclicOffWeeks: true,
+            // v1.15.18 — per-dose window so the score's compliance honours the
+            // same on-time band the detail % + history use.
+            doseWindows: true,
           },
         },
       },
diff --git a/src/lib/medications/scheduling/__tests__/band-minter.test.ts b/src/lib/medications/scheduling/__tests__/band-minter.test.ts
index e2975302f..bdbb16447 100644
--- a/src/lib/medications/scheduling/__tests__/band-minter.test.ts
+++ b/src/lib/medications/scheduling/__tests__/band-minter.test.ts
@@ -27,6 +27,7 @@ import {
   type CanonicalSchedule,
   type RecurrenceContext,
 } from "../recurrence";
+import { attributeIntakeToSlot } from "../attribution";
 import { localHmAsUtc } from "@/lib/timezone";
 
 const TZ = "Europe/Berlin";
@@ -468,3 +469,102 @@ describe("multi-schedule — bands built PER SCHEDULE (no cross-clip)", () => {
     expect(span).toBe(2 * 60 * MIN); // ±60min
   });
 });
+
+// ────────────────────────────────────────────────────────────────────
+// 9. Per-dose configurable window (Marc's "07:00–09:00" lever, v1.15.18 W7)
+// ────────────────────────────────────────────────────────────────────
+
+describe("explicit per-dose window from schedule.doseWindows", () => {
+  const m = med();
+  const day = new Date("2026-06-08T12:00:00Z");
+  // Morning dose carries an explicit 07:00–12:00 window; the evening dose
+  // none, so it keeps the symmetric ±60min default.
+  const sched = schedule({
+    timesOfDay: ["07:00", "19:00"],
+    doseWindows: [{ timeOfDay: "07:00", start: "07:00", end: "12:00" }],
+  });
+  const out = buildBandsForMedication({
+    medication: m,
+    schedule: sched,
+    ctx: ctxFor(m),
+    userTz: TZ,
+    range: { from: at(day, 0, 0), to: at(day, 23, 59) },
+    now: at(day, 23, 59),
+  });
+  const morning = out.bands.find((b) => b.timeOfDay === "07:00")!;
+  const evening = out.bands.find((b) => b.timeOfDay === "19:00")!;
+
+  it("builds the on-time band from the explicit [start,end] range", () => {
+    expect(morning.onTimeStart.getTime()).toBe(at(day, 7, 0).getTime());
+    expect(morning.onTimeEnd.getTime()).toBe(at(day, 12, 0).getTime());
+  });
+
+  it("an 11:29 take lands inside the widened on-time window", () => {
+    expect(attributeIntakeToSlot(at(day, 11, 29), out.bands)).toMatchObject({
+      band: { timeOfDay: "07:00" },
+      status: "on_time",
+    });
+  });
+
+  it("a dose with no entry keeps the symmetric ±60min default", () => {
+    expect(evening.onTimeStart.getTime()).toBe(at(day, 19, 0).getTime() - 60 * MIN);
+    expect(evening.onTimeEnd.getTime()).toBe(at(day, 19, 0).getTime() + 60 * MIN);
+  });
+
+  it("under the DEFAULT (no doseWindows) the same 11:29 take is ad-hoc", () => {
+    const dflt = buildBandsForMedication({
+      medication: m,
+      schedule: schedule({ timesOfDay: ["07:00", "19:00"] }),
+      ctx: ctxFor(m),
+      userTz: TZ,
+      range: { from: at(day, 0, 0), to: at(day, 23, 59) },
+      now: at(day, 23, 59),
+    });
+    // 11:29 is > 07:00 + on-time(60) + tail(180) = 11:00 cutoff → no band.
+    expect(attributeIntakeToSlot(at(day, 11, 29), dflt.bands)).toBeNull();
+  });
+
+  it("a malformed doseWindows shape falls back to the default derivation", () => {
+    const out2 = buildBandsForMedication({
+      medication: m,
+      // start > end is dropped by the normaliser; an unrelated timeOfDay is
+      // ignored. Neither widens the 07:00 band.
+      schedule: schedule({
+        timesOfDay: ["07:00", "19:00"],
+        doseWindows: [
+          { timeOfDay: "07:00", start: "12:00", end: "07:00" },
+        ] as never,
+      }),
+      ctx: ctxFor(m),
+      userTz: TZ,
+      range: { from: at(day, 0, 0), to: at(day, 23, 59) },
+      now: at(day, 23, 59),
+    });
+    const morn = out2.bands.find((b) => b.timeOfDay === "07:00")!;
+    expect(morn.onTimeStart.getTime()).toBe(at(day, 7, 0).getTime() - 60 * MIN);
+    expect(morn.onTimeEnd.getTime()).toBe(at(day, 7, 0).getTime() + 60 * MIN);
+  });
+});
+
+describe("explicit per-dose window is DST-correct (winter)", () => {
+  const m = med();
+  const winterDay = new Date("2026-01-15T12:00:00Z");
+  const sched = schedule({
+    timesOfDay: ["07:00"],
+    doseWindows: [{ timeOfDay: "07:00", start: "07:00", end: "09:00" }],
+  });
+  const out = buildBandsForMedication({
+    medication: m,
+    schedule: sched,
+    ctx: ctxFor(m),
+    userTz: TZ,
+    range: { from: at(winterDay, 0, 0), to: at(winterDay, 23, 59) },
+    now: at(winterDay, 23, 59),
+  });
+
+  it("mints the [start,end] bounds on the slot's local winter day (CET = +1)", () => {
+    const band = out.bands[0];
+    expect(band.onTimeStart.toISOString()).toBe("2026-01-15T06:00:00.000Z");
+    expect(band.onTimeEnd.toISOString()).toBe("2026-01-15T08:00:00.000Z");
+  });
+});
diff --git a/src/lib/medications/scheduling/__tests__/worker-helpers.test.ts b/src/lib/medications/scheduling/__tests__/worker-helpers.test.ts
new file mode 100644
index 000000000..648c4baf2
--- /dev/null
+++ b/src/lib/medications/scheduling/__tests__/worker-helpers.test.ts
@@ -0,0 +1,78 @@
+/**
+ * v1.15.18 — `normaliseDoseWindows` coerces the persisted `dose_windows` JSON
+ * into a clean `DoseWindowEntry[]`, dropping anything malformed so the band
+ * paths never have to defend against an arbitrary JSON shape.
+ */
+import { describe, expect, it } from "vitest";
+
+import {
+  buildCanonicalSchedule,
+  normaliseDoseWindows,
+  type WorkerScheduleRow,
+} from "../worker-helpers";
+
+describe("normaliseDoseWindows", () => {
+  it("returns null for null / non-array input", () => {
+    expect(normaliseDoseWindows(null)).toBeNull();
+    expect(normaliseDoseWindows(undefined)).toBeNull();
+    expect(normaliseDoseWindows("nope")).toBeNull();
+    expect(normaliseDoseWindows({ timeOfDay: "07:00" })).toBeNull();
+  });
+
+  it("keeps a well-formed entry", () => {
+    expect(
+      normaliseDoseWindows([{ timeOfDay: "07:00", start: "07:00", end: "09:00" }]),
+    ).toEqual([{ timeOfDay: "07:00", start: "07:00", end: "09:00" }]);
+  });
+
+  it("drops entries with start > end, bad HH:mm, or missing keys", () => {
+    expect(
+      normaliseDoseWindows([
+        { timeOfDay: "07:00", start: "12:00", end: "07:00" }, // start > end
+        { timeOfDay: "7:00", start: "07:00", end: "09:00" }, // bad HH:mm
+        { timeOfDay: "19:00", start: "19:00" }, // missing end
+        { timeOfDay: "08:00", start: "25:00", end: "26:00" }, // out of range
+      ]),
+    ).toBeNull();
+  });
+
+  it("keeps the good entries and drops the bad ones in a mixed array", () => {
+    expect(
+      normaliseDoseWindows([
+        { timeOfDay: "07:00", start: "07:00", end: "09:00" }, // good
+        { timeOfDay: "19:00", start: "20:00", end: "19:00" }, // start > end
+      ]),
+    ).toEqual([{ timeOfDay: "07:00", start: "07:00", end: "09:00" }]);
+  });
+
+  it("threads through buildCanonicalSchedule onto the canonical schedule", () => {
+    const row: WorkerScheduleRow = {
+      id: "s1",
+      windowStart: "07:00",
+      windowEnd: "09:00",
+      daysOfWeek: null,
+      timesOfDay: ["07:00"],
+      reminderGraceMinutes: null,
+      rrule: "FREQ=DAILY",
+      rollingIntervalDays: null,
+      doseWindows: [{ timeOfDay: "07:00", start: "07:00", end: "09:00" }],
+    };
+    expect(buildCanonicalSchedule(row).doseWindows).toEqual([
+      { timeOfDay: "07:00", start: "07:00", end: "09:00" },
+    ]);
+  });
+
+  it("a row with no doseWindows yields null on the canonical schedule", () => {
+    const row: WorkerScheduleRow = {
+      id: "s1",
+      windowStart: "07:00",
+      windowEnd: "09:00",
+      daysOfWeek: null,
+      timesOfDay: ["07:00"],
+      reminderGraceMinutes: null,
+      rrule: "FREQ=DAILY",
+      rollingIntervalDays: null,
+    };
+    expect(buildCanonicalSchedule(row).doseWindows).toBeNull();
+  });
+});
diff --git a/src/lib/medications/scheduling/band-minter.ts b/src/lib/medications/scheduling/band-minter.ts
index 4d62ba424..90326471a 100644
--- a/src/lib/medications/scheduling/band-minter.ts
+++ b/src/lib/medications/scheduling/band-minter.ts
@@ -47,6 +47,7 @@ import {
   expandRollingRetrospective,
   occurrencesBetween,
   type CanonicalSchedule,
+  type DoseWindowEntry,
   type Occurrence,
   type RecurrenceContext,
 } from "@/lib/medications/scheduling/recurrence";
@@ -172,7 +173,7 @@ export function buildBandsForMedication(
     // here (intakes drive the anchors), so the interval is the right signal.
     const family: "daily" | "weekly" =
       schedule.rollingIntervalDays >= 2 ? "weekly" : "daily";
-    const bands = mintBands(occ, family, input.windowConfig, userTz);
+    const bands = mintBands(occ, family, input.windowConfig, userTz, schedule);
     return { bands, hasExpectedSlots: true, family };
   }
 
@@ -182,7 +183,7 @@ export function buildBandsForMedication(
   // field-shape `doseCadenceFamily` heuristic.
   const occurrences = occurrencesBetween(schedule, range.from, range.to, ctx);
   const family = realisedFamily(schedule, ctx, range);
-  const bands = mintBands(occurrences, family, input.windowConfig, userTz);
+  const bands = mintBands(occurrences, family, input.windowConfig, userTz, schedule);
   return { bands, hasExpectedSlots: true, family };
 }
 
@@ -231,30 +232,106 @@ function mintBands(
   family: "daily" | "weekly",
   windowConfig: DoseWindowConfig | undefined,
   userTz: string,
+  schedule: CanonicalSchedule,
 ): SlotBand[] {
   const w = resolveWindows(windowConfig);
+  // The persisted per-dose windows (Marc's "07:00–09:00" lever). When a slot's
+  // `timeOfDay` matches an entry, the on-time band is the explicit `[start,
+  // end]` range; otherwise the default symmetric ±width applies. The late tail
+  // stays cadence-derived for every slot.
+  const explicit = indexDoseWindows(schedule.doseWindows ?? null);
   const inputs: SlotWindowInput[] = occurrences.map((occ) =>
     family === "weekly"
-      ? weeklyWindow(occ, w, userTz)
-      : dailyWindow(occ, w),
+      ? weeklyWindow(occ, w, userTz, explicit.get(occ.timeOfDay) ?? null)
+      : dailyWindow(occ, w, userTz, explicit.get(occ.timeOfDay) ?? null),
   );
   return buildSlotBands(inputs);
 }
 
-/** Minute-scale band around a slot instant (daily / intraday cadences). */
+/**
+ * Index the schedule's `doseWindows` by `timeOfDay` for O(1) per-slot lookup.
+ * A duplicate `timeOfDay` keeps the first entry (the write path Zod-validates
+ * uniqueness, so this is purely defensive).
+ */
+function indexDoseWindows(
+  windows: DoseWindowEntry[] | null,
+): Map<string, DoseWindowEntry> {
+  const map = new Map<string, DoseWindowEntry>();
+  if (!windows) return map;
+  for (const w of windows) {
+    // Defence-in-depth: only index well-formed `start <= end` HH:mm entries.
+    // `buildCanonicalSchedule` already normalises the persisted JSON, but a
+    // directly-constructed `CanonicalSchedule` (tests, compliance helpers)
+    // must never widen a band from a malformed range.
+    if (!isUsableDoseWindow(w)) continue;
+    if (!map.has(w.timeOfDay)) map.set(w.timeOfDay, w);
+  }
+  return map;
+}
+
+/** True when a dose window is well-formed HH:mm with `start <= end`. */
+function isUsableDoseWindow(w: DoseWindowEntry): boolean {
+  const start = localHourMinute(w.start);
+  const end = localHourMinute(w.end);
+  const startMin = start.hour * 60 + start.minute;
+  const endMin = end.hour * 60 + end.minute;
+  return (
+    HHMM_BAND_RE.test(w.timeOfDay) &&
+    HHMM_BAND_RE.test(w.start) &&
+    HHMM_BAND_RE.test(w.end) &&
+    startMin <= endMin
+  );
+}
+
+const HHMM_BAND_RE = /^([01]\d|2[0-3]):([0-5]\d)$/;
+
+/**
+ * Minute-scale band around a slot instant (daily / intraday cadences). When an
+ * explicit per-dose window is configured for this `timeOfDay`, the on-time band
+ * is the literal `[start, end]` range minted on the slot's local day (DST-correct
+ * via `localHmAsUtc`); otherwise the symmetric ±`dailyOnTimeMinutes` default.
+ */
 function dailyWindow(
   occ: Occurrence,
   w: ResolvedWindows,
+  userTz: string,
+  explicit: DoseWindowEntry | null,
 ): SlotWindowInput {
+  const onTime = explicit
+    ? explicitOnTimeBounds(occ.at, explicit, userTz)
+    : {
+        onTimeStart: new Date(
+          occ.at.getTime() - w.dailyOnTimeMinutes * MINUTE_MS,
+        ),
+        onTimeEnd: new Date(occ.at.getTime() + w.dailyOnTimeMinutes * MINUTE_MS),
+      };
   return {
     at: occ.at,
     timeOfDay: occ.timeOfDay,
-    onTimeStart: new Date(occ.at.getTime() - w.dailyOnTimeMinutes * MINUTE_MS),
-    onTimeEnd: new Date(occ.at.getTime() + w.dailyOnTimeMinutes * MINUTE_MS),
+    onTimeStart: onTime.onTimeStart,
+    onTimeEnd: onTime.onTimeEnd,
     lateGraceMs: w.dailyOverdueMinutes * MINUTE_MS,
   };
 }
 
+/**
+ * Mint an explicit `[start, end]` on-time range on the slot's local calendar
+ * day. `localHmAsUtc` keys off the local day of its first argument (`occ.at`),
+ * so the bounds land on the same day as the slot, DST-correct.
+ */
+function explicitOnTimeBounds(
+  occAt: Date,
+  window: DoseWindowEntry,
+  userTz: string,
+): { onTimeStart: Date; onTimeEnd: Date } {
+  const start = localHourMinute(window.start);
+  const end = localHourMinute(window.end);
+  return {
+    onTimeStart: localHmAsUtc(occAt, userTz, start.hour, start.minute),
+    onTimeEnd: localHmAsUtc(occAt, userTz, end.hour, end.minute),
+  };
+}
+
 /**
  * Day-scale band around a slot instant (weekly / rolling / sparse cadences).
  * The ±N-day bounds are minted via `localHmAsUtc` on the calendar days N days
@@ -265,20 +342,39 @@ function weeklyWindow(
   occ: Occurrence,
   w: ResolvedWindows,
   userTz: string,
+  explicit: DoseWindowEntry | null,
 ): SlotWindowInput {
   const { hour, minute } = localHourMinute(occ.timeOfDay);
-  const onTimeStart = localHmAsUtc(
-    new Date(occ.at.getTime() - w.weeklyOnTimeDays * DAY_MS),
-    userTz,
-    hour,
-    minute,
-  );
-  const onTimeEnd = localHmAsUtc(
-    new Date(occ.at.getTime() + w.weeklyOnTimeDays * DAY_MS),
-    userTz,
-    hour,
-    minute,
-  );
+  // An explicit per-dose window pins the on-time band to the literal `[start,
+  // end]` range on the slot's own local day (a within-day window the user set);
+  // otherwise the default day-scale ±`weeklyOnTimeDays` envelope. Either way the
+  // late tail below stays day-scale + DST-correct.
+  const onTimeStart = explicit
+    ? localHmAsUtc(
+        occ.at,
+        userTz,
+        localHourMinute(explicit.start).hour,
+        localHourMinute(explicit.start).minute,
+      )
+    : localHmAsUtc(
+        new Date(occ.at.getTime() - w.weeklyOnTimeDays * DAY_MS),
+        userTz,
+        hour,
+        minute,
+      );
+  const onTimeEnd = explicit
+    ? localHmAsUtc(
+        occ.at,
+        userTz,
+        localHourMinute(explicit.end).hour,
+        localHourMinute(explicit.end).minute,
+      )
+    : localHmAsUtc(
+        new Date(occ.at.getTime() + w.weeklyOnTimeDays * DAY_MS),
+        userTz,
+        hour,
+        minute,
+      );
   // The late tail is also day-scale: the instant N overdue-days past the
   // on-time end, minted on the calendar day for DST-correctness, then expressed
   // as a millisecond grace `buildSlotBands` consumes.
diff --git a/src/lib/medications/scheduling/cadence.ts b/src/lib/medications/scheduling/cadence.ts
index 63b6bff73..e608c23b7 100644
--- a/src/lib/medications/scheduling/cadence.ts
+++ b/src/lib/medications/scheduling/cadence.ts
@@ -44,6 +44,7 @@ import {
   expandRollingRetrospective,
   occurrencesBetween,
 } from "@/lib/medications/scheduling/recurrence";
+import { normaliseDoseWindows } from "@/lib/medications/scheduling/worker-helpers";
 import { wallClockInTz } from "@/lib/tz/wall-clock";
 
 /**
@@ -96,6 +97,14 @@ export interface ScheduleLike {
   scheduleType?: ScheduleType | null;
   cyclicOnWeeks?: number | null;
   cyclicOffWeeks?: number | null;
+  /**
+   * v1.15.18 — per-dose configurable on-time windows. Carried onto the
+   * canonical schedule so the cadence-timeline bands (the card last/next dose)
+   * honour the same explicit window the % and the history view use. Accepts the
+   * raw persisted JSON (a full Prisma row's `Json?` column drops straight in);
+   * `toCanonical` normalises it via `normaliseDoseWindows`.
+   */
+  doseWindows?: unknown;
   /** Stable id for the engine occurrence; defaults to a synthetic value. */
   id?: string;
 }
@@ -135,6 +144,7 @@ function toCanonical(
     scheduleType: schedule.scheduleType ?? "SCHEDULED",
     cyclicOnWeeks: schedule.cyclicOnWeeks ?? null,
     cyclicOffWeeks: schedule.cyclicOffWeeks ?? null,
+    doseWindows: normaliseDoseWindows(schedule.doseWindows),
   };
 }
 
diff --git a/src/lib/medications/scheduling/compliance.ts b/src/lib/medications/scheduling/compliance.ts
index e06061609..cc8e9ccff 100644
--- a/src/lib/medications/scheduling/compliance.ts
+++ b/src/lib/medications/scheduling/compliance.ts
@@ -40,6 +40,7 @@ import {
   type CanonicalSchedule,
   type RecurrenceContext,
 } from "./recurrence";
+import { normaliseDoseWindows } from "./worker-helpers";
 
 export interface ComplianceChips {
   /** 0-100, taken / (taken + missed). Skipped doses are excluded from
@@ -211,6 +212,7 @@ function ledgerChipCounts(
       scheduleType: s.scheduleType ?? "SCHEDULED",
       cyclicOnWeeks: s.cyclicOnWeeks ?? null,
       cyclicOffWeeks: s.cyclicOffWeeks ?? null,
+      doseWindows: normaliseDoseWindows(s.doseWindows),
     };
     // Surface windowStart as the single time-of-day for a legacy daily row
     // so the band minter's cadence gate mints its daily band (see the
diff --git a/src/lib/medications/scheduling/recurrence.ts b/src/lib/medications/scheduling/recurrence.ts
index 600835ee5..527026b53 100644
--- a/src/lib/medications/scheduling/recurrence.ts
+++ b/src/lib/medications/scheduling/recurrence.ts
@@ -81,6 +81,25 @@ export interface CanonicalSchedule {
   cyclicOnWeeks: number | null;
   /** v1.7.0 — cyclic "off" weeks. Only read when `scheduleType === "CYCLIC"`. */
   cyclicOffWeeks: number | null;
+  /**
+   * v1.15.18 — per-dose configurable on-time intake windows. The recurrence
+   * engine itself never reads these (slot timing is unchanged); they ride on
+   * the canonical schedule purely so the band minter can build a slot's
+   * on-time band from an explicit `[start, end]` range for the matching
+   * `timeOfDay`. NULL / empty = every slot uses the default ±1h derivation.
+   */
+  doseWindows?: DoseWindowEntry[] | null;
+}
+
+/**
+ * v1.15.18 — one explicit per-dose on-time window. `timeOfDay` keys the dose
+ * the window applies to (matching a `timesOfDay` entry); `start`/`end` are the
+ * HH:mm on-time bounds in the user's wall clock (`start <= end`, same local day).
+ */
+export interface DoseWindowEntry {
+  timeOfDay: string;
+  start: string;
+  end: string;
 }
 
 export interface RecurrenceContext {
diff --git a/src/lib/medications/scheduling/slot-upsert.ts b/src/lib/medications/scheduling/slot-upsert.ts
index 88d0d6d4b..cdd81e3e0 100644
--- a/src/lib/medications/scheduling/slot-upsert.ts
+++ b/src/lib/medications/scheduling/slot-upsert.ts
@@ -299,6 +299,9 @@ const SCHEDULE_SELECT = {
   scheduleType: true,
   cyclicOnWeeks: true,
   cyclicOffWeeks: true,
+  // v1.15.18 — the persisted per-dose window the band attribution honours so
+  // the write/edit slot binding uses the SAME on-time window as the % + history.
+  doseWindows: true,
 } as const;
 
 const MEDICATION_SELECT = {
diff --git a/src/lib/medications/scheduling/worker-helpers.ts b/src/lib/medications/scheduling/worker-helpers.ts
index 6ae899a31..fa66b78ed 100644
--- a/src/lib/medications/scheduling/worker-helpers.ts
+++ b/src/lib/medications/scheduling/worker-helpers.ts
@@ -18,6 +18,7 @@
  */
 import {
   type CanonicalSchedule,
+  type DoseWindowEntry,
   type RecurrenceContext,
   type ScheduleType,
   occurrencesBetween,
@@ -48,6 +49,13 @@ export interface WorkerScheduleRow {
   scheduleType?: ScheduleType | null;
   cyclicOnWeeks?: number | null;
   cyclicOffWeeks?: number | null;
+  /**
+   * v1.15.18 — per-dose on-time windows. The Prisma column is `Json?`, so a
+   * selected row surfaces it as `Prisma.JsonValue` (or `null`). The adapter
+   * normalises it to a `DoseWindowEntry[]` (dropping malformed entries) so the
+   * band minter never has to defend against an arbitrary JSON shape.
+   */
+  doseWindows?: unknown;
 }
 
 /** Minimal `Medication` projection used by the worker. */
@@ -78,9 +86,47 @@ export function buildCanonicalSchedule(
     scheduleType: schedule.scheduleType ?? "SCHEDULED",
     cyclicOnWeeks: schedule.cyclicOnWeeks ?? null,
     cyclicOffWeeks: schedule.cyclicOffWeeks ?? null,
+    doseWindows: normaliseDoseWindows(schedule.doseWindows),
   };
 }
 
+const HHMM_RE = /^([01]\d|2[0-3]):([0-5]\d)$/;
+
+/**
+ * v1.15.18 — coerce the persisted `dose_windows` JSON into a clean
+ * `DoseWindowEntry[]`. Drops anything that isn't an `{ timeOfDay, start, end }`
+ * triple of well-formed HH:mm strings with `start <= end` — the column is
+ * Zod-validated on write, but a hand-edited or legacy row must never crash the
+ * read/write band paths. Returns `null` (the default-derivation signal) when
+ * nothing usable survives.
+ */
+export function normaliseDoseWindows(raw: unknown): DoseWindowEntry[] | null {
+  if (!Array.isArray(raw)) return null;
+  const out: DoseWindowEntry[] = [];
+  for (const item of raw) {
+    if (typeof item !== "object" || item === null) continue;
+    const { timeOfDay, start, end } = item as Record<string, unknown>;
+    if (
+      typeof timeOfDay !== "string" ||
+      typeof start !== "string" ||
+      typeof end !== "string" ||
+      !HHMM_RE.test(timeOfDay) ||
+      !HHMM_RE.test(start) ||
+      !HHMM_RE.test(end) ||
+      hhmmToMinutes(start) > hhmmToMinutes(end)
+    ) {
+      continue;
+    }
+    out.push({ timeOfDay, start, end });
+  }
+  return out.length > 0 ? out : null;
+}
+
+function hhmmToMinutes(hhmm: string): number {
+  const [h, m] = hhmm.split(":");
+  return Number(h) * 60 + Number(m);
+}
+
 /** Build the canonical engine context from worker-loop state. */
 export function buildRecurrenceContext(input: {
   medication: WorkerMedicationRow;