diff --git a/tests/integration/integration-status.test.ts b/tests/integration/integration-status.test.ts
new file mode 100644
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+++ b/tests/integration/integration-status.test.ts
@@ -0,0 +1,260 @@
+/**
+ * v1.4.15 Phase B2 — IntegrationStatus end-to-end (real Postgres).
+ *
+ * The unit suite (`src/lib/integrations/__tests__/status.test.ts`)
+ * mocks Prisma. This file lights up the real driver so we lock in the
+ * upsert + concurrent-write story AND prove that every sync failure
+ * writes one `AuditLog` row with the documented schema:
+ *
+ *   action  : "integrations.sync.failed"
+ *   userId  : <subject>
+ *   details : { integration, kind, errorCode, message,
+ *               attemptNumber, state }
+ *
+ * The dispatcher is mocked at module level so we don't actually hit
+ * Telegram while testing — the assertion is on the alerting side
+ * effects, not the network.
+ */
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+// Crypto reads `ENCRYPTION_KEY` lazily on first encrypt(). vitest does
+// NOT load the dev `.env`, so we seed a deterministic 32-byte test key
+// before any `@/lib/integrations/status` import — that module wraps
+// `encrypt()` for the `lastError` column.
+process.env.ENCRYPTION_KEY ??=
+  "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef";
+
+import { getPrismaClient, truncateAllTables } from "./setup";
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+// The dispatcher would otherwise try to read encrypted channel
+// configs and call sendViaTelegram. We're not testing that path —
+// B3 owns it. Stub returns void so the helper's await chain
+// resolves cleanly.
+vi.mock("@/lib/notifications/dispatcher", () => ({
+  dispatchNotification: vi.fn().mockResolvedValue(undefined),
+}));
+
+import {
+  recordSyncFailure,
+  recordSyncSuccess,
+  markReauthRequired,
+  markDisconnected,
+  markReconnected,
+  isReauthRequired,
+  getIntegrationStatus,
+} from "@/lib/integrations/status";
+import { dispatchNotification } from "@/lib/notifications/dispatcher";
+
+const TEST_USER_ID = "user-integration-status-e2e";
+
+beforeEach(async () => {
+  await truncateAllTables(getPrismaClient());
+  await getPrismaClient().user.create({
+    data: {
+      id: TEST_USER_ID,
+      username: "int-status-test",
+      email: "int-status@example.test",
+    },
+  });
+  vi.mocked(dispatchNotification).mockClear();
+});
+
+describe("IntegrationStatus end-to-end", () => {
+  it("recordSyncFailure writes an integration_statuses row AND a matching AuditLog entry", async () => {
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "withings",
+      kind: "transient",
+      message: "Withings refresh error: 503 - upstream",
+      errorCode: "503",
+    });
+
+    const status = await getPrismaClient().integrationStatus.findUnique({
+      where: {
+        userId_integration: {
+          userId: TEST_USER_ID,
+          integration: "withings",
+        },
+      },
+    });
+    expect(status).not.toBeNull();
+    expect(status!.state).toBe("error_transient");
+    expect(status!.consecutiveFailures).toBe(1);
+    expect(status!.lastAttemptAt).toBeInstanceOf(Date);
+    expect(status!.lastError).toBeTruthy();
+    // Encrypted at rest — must NOT be the plaintext message.
+    expect(status!.lastError).not.toContain("Withings refresh error");
+
+    const audits = await getPrismaClient().auditLog.findMany({
+      where: { action: "integrations.sync.failed", userId: TEST_USER_ID },
+    });
+    expect(audits).toHaveLength(1);
+    const detailsParsed = JSON.parse(audits[0].details ?? "{}");
+    expect(detailsParsed).toMatchObject({
+      integration: "withings",
+      kind: "transient",
+      errorCode: "503",
+      message: "Withings refresh error: 503 - upstream",
+      attemptNumber: 1,
+      state: "error_transient",
+    });
+  });
+
+  it("getIntegrationStatus returns plaintext error after roundtrip (decryption succeeds)", async () => {
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "moodlog",
+      kind: "transient",
+      message: "moodLog sync HTTP 502",
+      errorCode: "http_502",
+    });
+    const snapshot = await getIntegrationStatus(TEST_USER_ID, "moodlog");
+    expect(snapshot.state).toBe("error_transient");
+    expect(snapshot.lastError).toBe("moodLog sync HTTP 502");
+    expect(snapshot.consecutiveFailures).toBe(1);
+  });
+
+  it("recordSyncSuccess clears the streak, resets state, and (importantly) does NOT write an audit row", async () => {
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "withings",
+      kind: "transient",
+      message: "transient blip",
+    });
+    await recordSyncSuccess(TEST_USER_ID, "withings");
+
+    const status = await getPrismaClient().integrationStatus.findUnique({
+      where: {
+        userId_integration: { userId: TEST_USER_ID, integration: "withings" },
+      },
+    });
+    expect(status!.state).toBe("connected");
+    expect(status!.consecutiveFailures).toBe(0);
+    expect(status!.lastError).toBeNull();
+    expect(status!.lastSuccessAt).toBeInstanceOf(Date);
+
+    // Successes are NOT audited (would be too noisy — design choice).
+    const successAudits = await getPrismaClient().auditLog.findMany({
+      where: { action: "integrations.sync.success" },
+    });
+    expect(successAudits).toHaveLength(0);
+  });
+
+  it("crossing the default threshold (3) dispatches an admin Telegram alert exactly once per burst", async () => {
+    // Seed an admin user so the alert resolution finds at least one
+    // recipient. The dispatcher itself is stubbed.
+    await getPrismaClient().user.create({
+      data: {
+        id: "admin-int-status-test",
+        username: "admin-int-status",
+        email: "admin@example.test",
+        role: "ADMIN",
+      },
+    });
+
+    // 3 consecutive failures in the same burst.
+    for (let i = 0; i < 3; i++) {
+      await recordSyncFailure({
+        userId: TEST_USER_ID,
+        integration: "withings",
+        kind: "transient",
+        message: "Withings refresh error: 503 - upstream",
+        errorCode: "503",
+      });
+    }
+
+    // Exactly one alert (on the 3rd failure crossing threshold).
+    expect(dispatchNotification).toHaveBeenCalledTimes(1);
+    const payload = vi.mocked(dispatchNotification).mock.calls[0][0];
+    expect(payload.eventType).toBe("SYSTEM_ALERT");
+    expect(payload.userId).toBe("admin-int-status-test");
+
+    // alertedAt is stamped — a 4th failure inside the 24h window must
+    // NOT page again.
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "withings",
+      kind: "transient",
+      message: "Withings refresh error: 503 - upstream",
+    });
+    expect(dispatchNotification).toHaveBeenCalledTimes(1);
+
+    // After a single success, a fresh streak starts and the next
+    // burst is allowed to alert again.
+    await recordSyncSuccess(TEST_USER_ID, "withings");
+    for (let i = 0; i < 3; i++) {
+      await recordSyncFailure({
+        userId: TEST_USER_ID,
+        integration: "withings",
+        kind: "transient",
+        message: "Withings refresh error: 503 - upstream",
+      });
+    }
+    expect(dispatchNotification).toHaveBeenCalledTimes(2);
+  });
+
+  it("kind=reauth_required parks the integration so isReauthRequired() returns true", async () => {
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "moodlog",
+      kind: "reauth_required",
+      message: "moodLog sync HTTP 401",
+      errorCode: "http_401",
+    });
+    expect(await isReauthRequired(TEST_USER_ID, "moodlog")).toBe(true);
+    expect(await isReauthRequired(TEST_USER_ID, "withings")).toBe(false);
+  });
+
+  it("markReconnected clears the parked state without writing a fresh success", async () => {
+    await markReauthRequired(TEST_USER_ID, "withings", "invalid_grant");
+    expect(await isReauthRequired(TEST_USER_ID, "withings")).toBe(true);
+
+    await markReconnected(TEST_USER_ID, "withings");
+    expect(await isReauthRequired(TEST_USER_ID, "withings")).toBe(false);
+
+    const row = await getPrismaClient().integrationStatus.findUnique({
+      where: {
+        userId_integration: { userId: TEST_USER_ID, integration: "withings" },
+      },
+    });
+    expect(row!.state).toBe("connected");
+    // No fresh lastSuccessAt — that's the next sync's job.
+    expect(row!.lastSuccessAt).toBeNull();
+  });
+
+  it("markDisconnected wipes the error state but leaves the row as a tombstone", async () => {
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "moodlog",
+      kind: "transient",
+      message: "blip",
+    });
+    await markDisconnected(TEST_USER_ID, "moodlog");
+    const row = await getPrismaClient().integrationStatus.findUnique({
+      where: {
+        userId_integration: { userId: TEST_USER_ID, integration: "moodlog" },
+      },
+    });
+    expect(row!.state).toBe("disconnected");
+    expect(row!.lastError).toBeNull();
+    expect(row!.consecutiveFailures).toBe(0);
+  });
+
+  it("CASCADE delete on User removes the IntegrationStatus row", async () => {
+    await recordSyncFailure({
+      userId: TEST_USER_ID,
+      integration: "withings",
+      kind: "transient",
+      message: "blip",
+    });
+    await getPrismaClient().user.delete({ where: { id: TEST_USER_ID } });
+    const remaining = await getPrismaClient().integrationStatus.findMany({
+      where: { userId: TEST_USER_ID },
+    });
+    expect(remaining).toHaveLength(0);
+  });
+});