diff --git a/src/__tests__/service-worker.test.ts b/src/__tests__/service-worker.test.ts
index 7c2a56db0..ec749ab7b 100644
--- a/src/__tests__/service-worker.test.ts
+++ b/src/__tests__/service-worker.test.ts
@@ -45,6 +45,8 @@ class FakeCache {
   putDelay: Promise<void> | undefined;
   onPut: (() => void) | undefined;
   keysError: Error | undefined;
+  addAllResponse:
+    ((request: Request) => Promise<Response> | Response) | undefined;
 
   private keyOf(request: RequestInfo | URL): string {
     if (typeof request === "string") return new URL(request, ORIGIN).href;
@@ -65,7 +67,13 @@ class FakeCache {
 
   async addAll(urls: string[]): Promise<void> {
     for (const url of urls) {
-      this.map.set(this.keyOf(url), new Response(`precached:${url}`));
+      const request = new Request(new URL(url, ORIGIN), {
+        credentials: "same-origin",
+      });
+      const response = this.addAllResponse
+        ? await this.addAllResponse(request)
+        : new Response(`precached:${url}`);
+      this.map.set(this.keyOf(request), response);
     }
   }
 
@@ -199,6 +207,16 @@ async function dispatchActivate(harness: SwHarness): Promise<void> {
   await settled;
 }
 
+async function dispatchInstall(harness: SwHarness): Promise<void> {
+  let settled: Promise<unknown> = Promise.resolve();
+  harness.listeners.get("install")!({
+    waitUntil: (p: Promise<unknown>) => {
+      settled = p;
+    },
+  });
+  await settled;
+}
+
 function dispatchNavigationFetch(
   harness: SwHarness,
   path: string,
@@ -474,6 +492,43 @@ describe("sw.js — activate", () => {
   });
 });
 
+describe("sw.js — authenticated install cache isolation", () => {
+  it("never requests or stores signed-in root HTML while retaining public immutable assets", async () => {
+    const harness = bootServiceWorker();
+    const statics = await harness.cacheStorage.open(CURRENT_STATIC_CACHE);
+    const requested: Request[] = [];
+    const healthSentinel = "PRIVATE_DASHBOARD_WEIGHT_81_7_KG";
+    statics.addAllResponse = async (request) => {
+      requested.push(request);
+      return new Response(
+        new URL(request.url).pathname === "/"
+          ? `<html><body>${healthSentinel}</body></html>`
+          : `public-asset:${new URL(request.url).pathname}`,
+      );
+    };
+
+    await dispatchInstall(harness);
+
+    expect
+      .soft(requested.map((request) => new URL(request.url).pathname))
+      .not.toContain("/");
+    expect
+      .soft(requested.every((request) => request.credentials === "same-origin"))
+      .toBe(true);
+    const cachedBodies = await Promise.all(
+      [...statics.map.values()].map((response) => response.clone().text()),
+    );
+    expect.soft(cachedBodies.join("\n")).not.toContain(healthSentinel);
+    expect(await statics.match(`${ORIGIN}/logo-192.png`)).toBeDefined();
+
+    const offline = await dispatchNavigationFetch(harness, "/");
+    const offlineBody = await offline.text();
+    expect.soft(offline.status).toBe(503);
+    expect.soft(offlineBody).toContain("Offline");
+    expect(offlineBody).not.toContain(healthSentinel);
+  });
+});
+
 describe("sw.js — networkFirst offline fallback", () => {
   it("never serves a shell cached under a previous CACHE_VERSION", async () => {
     const harness = bootServiceWorker();
diff --git a/src/__tests__/sw-security-hardening.test.ts b/src/__tests__/sw-security-hardening.test.ts
index 4814e6f76..a587f28ce 100644
--- a/src/__tests__/sw-security-hardening.test.ts
+++ b/src/__tests__/sw-security-hardening.test.ts
@@ -79,6 +79,17 @@ describe("public/sw.js offline fallback locale neutrality (F-7, 2026-05-16)", ()
   });
 });
 
+describe("public/sw.js authenticated install isolation (SEC-02)", () => {
+  it("precaches public immutable assets but never the authenticated root route", () => {
+    const sw = readSw();
+    const precache = /const PRECACHE_URLS = \[([^\]]+)\]/.exec(sw)?.[1];
+
+    expect(precache).toBeDefined();
+    expect.soft(precache).not.toMatch(/["']\/["']/);
+    expect(precache).toMatch(/\/(?:logo|icons)\/?[^"']*\.(?:png|svg)/);
+  });
+});
+
 describe("public/manifest.json PWA identity hygiene (F-7, 2026-05-16)", () => {
   it("declares an explicit scope, id, and display_override", () => {
     const raw = readFileSync(MANIFEST_PATH, "utf-8");
diff --git a/src/lib/pwa/__tests__/query-persister.test.ts b/src/lib/pwa/__tests__/query-persister.test.ts
index b0400670b..e8451186e 100644
--- a/src/lib/pwa/__tests__/query-persister.test.ts
+++ b/src/lib/pwa/__tests__/query-persister.test.ts
@@ -2,6 +2,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { QueryClient } from "@tanstack/react-query";
 
 import {
+  clearOfflineCachesForSessionEnd,
   clearPersistedQueryCache,
   isPersistableKey,
   restorePersistedQueryCache,
@@ -86,6 +87,51 @@ describe("persister degrades gracefully without IndexedDB", () => {
   });
 });
 
+describe("session-end CacheStorage cleanup", () => {
+  const originalCaches = (globalThis as { caches?: CacheStorage }).caches;
+
+  afterEach(() => {
+    if (originalCaches === undefined) {
+      delete (globalThis as { caches?: CacheStorage }).caches;
+    } else {
+      (globalThis as { caches?: CacheStorage }).caches = originalCaches;
+    }
+  });
+
+  it("deletes current and legacy HealthLog static/page/data caches only", async () => {
+    const cacheNames = [
+      "healthlog-static-v1.34.0",
+      "healthlog-static-v1.15.20",
+      "healthlog-pages-v1.34.0",
+      "healthlog-pages-v1.15.20",
+      "healthlog-data-v1.34.0",
+      "healthlog-data-v1.15.20",
+      "unrelated-app-static-v7",
+      "workbox-precache-healthlog",
+    ];
+    const deleted: string[] = [];
+    (globalThis as { caches?: CacheStorage }).caches = {
+      keys: async () => cacheNames,
+      delete: async (name: string) => {
+        deleted.push(name);
+        return true;
+      },
+    } as CacheStorage;
+
+    await clearOfflineCachesForSessionEnd();
+
+    expect
+      .soft(deleted.sort())
+      .toEqual(
+        cacheNames
+          .filter((name) => /^healthlog-(?:static|pages|data)-/.test(name))
+          .sort(),
+      );
+    expect(deleted).not.toContain("unrelated-app-static-v7");
+    expect(deleted).not.toContain("workbox-precache-healthlog");
+  });
+});
+
 describe("persister round-trips through a fake IndexedDB", () => {
   const original = (globalThis as { indexedDB?: unknown }).indexedDB;