diff --git a/src/__tests__/managed-profile-contract.test.ts b/src/__tests__/managed-profile-contract.test.ts
new file mode 100644
index 000000000..67ef25d37
--- /dev/null
+++ b/src/__tests__/managed-profile-contract.test.ts
@@ -0,0 +1,26 @@
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+
+const root = process.cwd();
+
+describe("managed-profile contract", () => {
+  it("requires a cookie-backed fresh MFA proof for creation", async () => {
+    const source = await readFile(
+      path.join(root, "src/app/api/managed-profiles/route.ts"),
+      "utf8",
+    );
+
+    expect(source).toContain("requireFreshMfa");
+    expect(source).not.toContain("requireFreshMfaIfEnrolled");
+  });
+
+  it("does not publish an emancipation API surface", async () => {
+    const source = await readFile(
+      path.join(root, "prisma/schema.prisma"),
+      "utf8",
+    );
+
+    expect(source.toLowerCase()).not.toContain("emancipation");
+  });
+});
diff --git a/tests/integration/managed-profile-lifecycle.test.ts b/tests/integration/managed-profile-lifecycle.test.ts
new file mode 100644
index 000000000..564412b04
--- /dev/null
+++ b/tests/integration/managed-profile-lifecycle.test.ts
@@ -0,0 +1,160 @@
+import { NextRequest } from "next/server";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { cookieJar, headerJar } from "./mock-next-headers";
+import { getPrismaClient, truncateAllTables } from "./setup";
+
+vi.mock("next/headers", async () => {
+  const { cookieJar, headerJar } = await import("./mock-next-headers");
+  return {
+    headers: vi.fn(async () => ({
+      get: (name: string) => headerJar.get(name.toLowerCase()) ?? null,
+    })),
+    cookies: vi.fn(async () => ({
+      get: (name: string) => {
+        const value = cookieJar.get(name);
+        return value ? { name, value } : undefined;
+      },
+      set: (name: string, value: string) => {
+        cookieJar.set(name, value);
+      },
+      delete: (name: string) => {
+        cookieJar.delete(name);
+      },
+    })),
+  };
+});
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+let sequence = 0;
+
+async function signInWithFreshMfa() {
+  const suffix = sequence++;
+  const prisma = getPrismaClient();
+  const guardian = await prisma.user.create({
+    data: {
+      username: `guardian-${suffix}`,
+      email: `guardian-${suffix}@example.test`,
+      totpConfirmedAt: new Date(),
+    },
+  });
+  const session = await prisma.session.create({
+    data: {
+      userId: guardian.id,
+      expiresAt: new Date(Date.now() + 60 * 60 * 1000),
+      mfaVerifiedAt: new Date(),
+    },
+  });
+  cookieJar.set("healthlog_session", session.id);
+  return guardian;
+}
+
+function createRequest(body: unknown): NextRequest {
+  return new NextRequest("http://localhost/api/managed-profiles", {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify(body),
+  });
+}
+
+beforeEach(async () => {
+  await truncateAllTables(getPrismaClient());
+  cookieJar.clear();
+  headerJar.clear();
+});
+
+afterEach(async () => {
+  const prisma = getPrismaClient();
+  await prisma.$executeRawUnsafe(
+    'DROP TRIGGER IF EXISTS managed_profile_creation_failure ON "account_grants"',
+  );
+  await prisma.$executeRawUnsafe(
+    "DROP FUNCTION IF EXISTS fail_managed_profile_creation()",
+  );
+});
+
+describe("managed profile lifecycle (real Postgres)", () => {
+  it("creation records a complete DOB and one accepted non-expiring Guardian grant", async () => {
+    const guardian = await signInWithFreshMfa();
+    const { POST } = await import("@/app/api/managed-profiles/route");
+
+    const response = await POST(
+      createRequest({
+        displayName: "Managed profile",
+        dateOfBirth: "2012-03-04",
+        locale: "de",
+        timezone: "Europe/Zurich",
+      }),
+    );
+    expect(response.status).toBe(201);
+
+    const body = await response.json();
+    const profile = await getPrismaClient().user.findUniqueOrThrow({
+      where: { id: body.data.id },
+    });
+    expect(profile.username).toMatch(/^managed-/);
+    expect(profile.username).not.toContain("Managed profile");
+    expect(profile.email).toBeNull();
+    expect(profile.passwordHash).toBeNull();
+    expect(profile.dateOfBirth?.toISOString().slice(0, 10)).toBe("2012-03-04");
+    expect(profile.locale).toBe("de");
+    expect(profile.timezone).toBe("Europe/Zurich");
+    expect(profile.managedProfileAt).not.toBeNull();
+
+    const grant = await getPrismaClient().accountGrant.findFirstOrThrow({
+      where: { grantorId: profile.id, granteeId: guardian.id },
+    });
+    expect(grant.access).toBe("MANAGE");
+    expect(grant.acceptedAt).not.toBeNull();
+    expect(grant.expiresAt).toBeNull();
+  });
+
+  it("creation accepts an absent DOB without fabricating one", async () => {
+    await signInWithFreshMfa();
+    const { POST } = await import("@/app/api/managed-profiles/route");
+
+    const response = await POST(
+      createRequest({
+        displayName: "No birth date",
+        locale: "en",
+        timezone: "UTC",
+      }),
+    );
+    expect(response.status).toBe(201);
+    const body = await response.json();
+    const profile = await getPrismaClient().user.findUniqueOrThrow({
+      where: { id: body.data.id },
+    });
+    expect(profile.dateOfBirth).toBeNull();
+  });
+
+  it("rolls the profile back when creating its Guardian grant fails", async () => {
+    await signInWithFreshMfa();
+    const prisma = getPrismaClient();
+    await prisma.$executeRawUnsafe(
+      "CREATE FUNCTION fail_managed_profile_creation() RETURNS trigger LANGUAGE plpgsql AS $$ BEGIN RAISE EXCEPTION 'managed profile grant failure'; END; $$",
+    );
+    await prisma.$executeRawUnsafe(
+      'CREATE TRIGGER managed_profile_creation_failure BEFORE INSERT ON "account_grants" FOR EACH ROW EXECUTE FUNCTION fail_managed_profile_creation()',
+    );
+
+    const { POST } = await import("@/app/api/managed-profiles/route");
+    const response = await POST(
+      createRequest({
+        displayName: "Must roll back",
+        locale: "en",
+        timezone: "UTC",
+      }),
+    );
+    expect(response.status).toBe(500);
+    expect(
+      await prisma.user.count({
+        where: { managedProfileAt: { not: null } },
+      }),
+    ).toBe(0);
+    expect(await prisma.accountGrant.count()).toBe(0);
+  });
+});