diff --git a/src/app/api/medications/[id]/intake/__tests__/route.test.ts b/src/app/api/medications/[id]/intake/__tests__/route.test.ts
index fc87a09b3..984f5fb73 100644
--- a/src/app/api/medications/[id]/intake/__tests__/route.test.ts
+++ b/src/app/api/medications/[id]/intake/__tests__/route.test.ts
@@ -96,7 +96,14 @@ import { getSession } from "@/lib/auth/session";
 
 const SESSION_OK = {
   session: { id: "sess-1", expiresAt: new Date(Date.now() + 3_600_000) },
-  user: { id: "user-1", username: "marc", role: "USER" as const },
+  user: {
+    id: "user-1",
+    username: "marc",
+    role: "USER" as const,
+    // Pin the user timezone so slot-instant resolution is deterministic
+    // regardless of the host TZ (CI runs in UTC, local in Europe/Berlin).
+    timezone: "Europe/Berlin",
+  },
 };
 
 const MED_OK = { id: "med-1", userId: "user-1" };
diff --git a/tests/integration/analytics-health-score.test.ts b/tests/integration/analytics-health-score.test.ts
index b6e8a5cea..cfaec655b 100644
--- a/tests/integration/analytics-health-score.test.ts
+++ b/tests/integration/analytics-health-score.test.ts
@@ -163,7 +163,12 @@ describe("GET /api/analytics — Health Score", () => {
       },
     });
     for (let i = 0; i < 30; i++) {
+      // Anchor the take to a fixed wall-clock instant that lands inside the
+      // 08:00–10:00 Berlin window (07:30 UTC ≈ 09:30 Berlin) so the slot
+      // matcher reads "on-time" deterministically regardless of host TZ —
+      // an unaligned `now - i*DAY` shifts its Berlin hour with the runner TZ.
       const scheduledFor = new Date(now - i * DAY);
+      scheduledFor.setUTCHours(7, 30, 0, 0);
       await prisma.medicationIntakeEvent.create({
         data: {
           userId: user.id,
@@ -283,7 +288,12 @@ describe("GET /api/analytics — Health Score", () => {
       },
     });
     for (let i = 0; i < 30; i++) {
+      // Anchor the take to a fixed wall-clock instant that lands inside the
+      // 08:00–10:00 Berlin window (07:30 UTC ≈ 09:30 Berlin) so the slot
+      // matcher reads "on-time" deterministically regardless of host TZ —
+      // an unaligned `now - i*DAY` shifts its Berlin hour with the runner TZ.
       const scheduledFor = new Date(now - i * DAY);
+      scheduledFor.setUTCHours(7, 30, 0, 0);
       await prisma.medicationIntakeEvent.create({
         data: {
           userId: user.id,
diff --git a/tests/integration/analytics-sleep-stages.test.ts b/tests/integration/analytics-sleep-stages.test.ts
index 983d06b6f..2b8fdd13d 100644
--- a/tests/integration/analytics-sleep-stages.test.ts
+++ b/tests/integration/analytics-sleep-stages.test.ts
@@ -100,7 +100,11 @@ describe("GET /api/analytics — sleep-stage aggregation", () => {
     // One night with the four iOS-16+ stages tagged. The analytics
     // route should surface a single Measurement-summary datapoint
     // (~480 minutes total) plus a per-stage breakdown.
-    const baseDate = new Date("2026-05-09T01:00:00.000Z");
+    // Anchor the night comfortably inside the route's trailing 30-day
+    // window (relative to `now`) so the test never drifts onto the
+    // window edge as the calendar advances or the host TZ shifts.
+    const baseDate = new Date(Date.now() - 5 * 24 * 60 * 60 * 1000);
+    baseDate.setUTCHours(1, 0, 0, 0);
     const stages: Array<{
       stage: "IN_BED" | "CORE" | "DEEP" | "REM";
       min: number;
diff --git a/tests/integration/medication-weekly-compliance.test.ts b/tests/integration/medication-weekly-compliance.test.ts
index 6ba684e23..11a9004c7 100644
--- a/tests/integration/medication-weekly-compliance.test.ts
+++ b/tests/integration/medication-weekly-compliance.test.ts
@@ -212,15 +212,20 @@ describe("weekly injectable compliance (Mounjaro 0% regression)", () => {
       rrule: "FREQ=WEEKLY;BYDAY=MO",
       windowStart: "07:30",
     });
-    // Log only 12 of the trailing 13 Mondays (skip the most recent).
+    // Take the most-recent Monday on time, then skip ONE older Monday
+    // (`lastMonday − 7d`, which sits 9 days before the pinned now — past
+    // the weekly 4-day overdue tail, so it counts as definitively missed
+    // rather than still-takeable) and take the 11 Mondays before it. The
+    // gap is a real, settled miss, not a head-of-window overdue slot.
+    await logWeeklyIntakes(id, lastMonday, 1);
     await logWeeklyIntakes(
       id,
-      new Date(lastMonday.getTime() - 7 * DAY_MS),
-      12,
+      new Date(lastMonday.getTime() - 14 * DAY_MS),
+      11,
     );
 
     const { compliance90 } = await readCompliance(id);
-    // 12 of 13 expected → ~92%, definitively non-zero and below 100.
+    // 12 taken of 13 expected → ~92%, definitively non-zero and below 100.
     expect(compliance90.rate).toBeGreaterThan(80);
     expect(compliance90.rate).toBeLessThan(100);
     expect(compliance90.missed).toBeGreaterThanOrEqual(1);