feat(api): add unauthenticated health endpoints

Add GET /api/v1/health/live and GET /api/v1/health/ready per ADR 0044.

- live returns a fixed 200 {"status":"live"} whenever the process serves.
- ready returns 200 {"status":"ready"} only when module startup has
  completed (and shutdown has not begun) and a database ping succeeds
  within 2s; otherwise a fixed 503 {"code":"NOT_READY"}.
- The ping runs on the shared pool as one simple-protocol message with
  a transaction-local statement_timeout, so PostgreSQL cancels a stalled
  statement; the pool discards the connection on failure.
- At most one ping is ever unsettled: probes share its outcome and, once
  its deadline passes, answer 503 immediately until it settles.
- Both routes set Cache-Control: no-store, accept GET only (405 with
  Allow: GET otherwise, HEAD included), never resolve a principal, and
  are mounted in app.ts beside, never inside, /api/v1/modules/.
- createApiApp gains a required `health` option; startApi supplies it
  and clears module readiness when shutdown begins.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/api/tests/api-http.integration.ts

@@ -27,6 +27,12 @@ import { Client, type QueryResultRow } from "pg";
 import { afterAll, describe, expect, it, vi } from "vitest";
 import type { ClientAddressConfigInput } from "../src/client-address.js";
 import { createApiRuntimeConfig } from "../src/config.js";
+import { createApiDatabase } from "../src/database.js";
+import {
+  HEALTH_LIVE_PATH,
+  HEALTH_READY_PATH,
+  READINESS_DATABASE_TIMEOUT_MS,
+} from "../src/health-routes.js";
 import {
   MODULE_UI_CACHE_CONTROL,
   MODULE_UI_CONTENT_TYPE,
@@ -2977,6 +2983,56 @@ describe.sequential("live API — published module UI artifact", () => {
   });
 });
 
+describe.sequential("live API — health", () => {
+  it("answers liveness and readiness with 200 against a migrated disposable PostgreSQL", async () => {
+    const database = await createDisposableDatabase("health");
+    await applyCoreMigrations(database.url);
+    const running = await startMigratedApi(database.url);
+    try {
+      const origin = apiOrigin(running);
+
+      const live = await fetch(`${origin}${HEALTH_LIVE_PATH}`);
+      expect(live.status).toBe(200);
+      expect(live.headers.get("cache-control")).toBe("no-store");
+      expect(await live.json()).toEqual({ status: "live" });
+
+      const ready = await fetch(`${origin}${HEALTH_READY_PATH}`);
+      expect(ready.status).toBe(200);
+      expect(ready.headers.get("cache-control")).toBe("no-store");
+      expect(await ready.json()).toEqual({ status: "ready" });
+    } finally {
+      await running.shutdown();
+    }
+  });
+
+  it("pings through the shared pool, and PostgreSQL itself cancels a statement that outlives the ping's transaction-local timeout", async () => {
+    const database = await createDisposableDatabase("health_ping");
+    const handle = createApiDatabase(database.url);
+    try {
+      await expect(handle.ping(READINESS_DATABASE_TIMEOUT_MS)).resolves.toBeUndefined();
+    } finally {
+      await handle.close();
+    }
+
+    // The ping's exact statement shape, with a statement that cannot finish inside its timeout: the
+    // server cancels it (query_canceled) long before the sleep would end, on a client that has no
+    // client-side timeout of its own.
+    const client = new Client({ connectionString: database.url });
+    await client.connect();
+    try {
+      const startedAt = Date.now();
+      await expect(
+        client.query(
+          "BEGIN READ ONLY; SET LOCAL statement_timeout = 50; SELECT pg_sleep(5); COMMIT",
+        ),
+      ).rejects.toMatchObject({ code: "57014" });
+      expect(Date.now() - startedAt).toBeLessThan(2_000);
+    } finally {
+      await client.end();
+    }
+  });
+});
+
 describe.sequential("live API — public signup is disabled by default", () => {
   it("rejects sign-up with a stable sanitized 400 when publicSignupEnabled is not set, creating no user row", async () => {
     const database = await createDisposableDatabase("signup_disabled");

apps/api/tests/app.test.ts

@@ -25,6 +25,7 @@ import {
 } from "../src/app.js";
 import { AUTH_REQUEST_MAX_BODY_BYTES } from "../src/body-limits.js";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { emptyModuleConfiguration } from "./support/in-memory-module-configuration.js";
 import { emptyModuleLifecycle } from "./support/in-memory-module-lifecycle.js";
 import { emptyModuleStorage } from "./support/in-memory-module-storage.js";
@@ -104,6 +105,7 @@ function createAuthWiringApp(runtime: EkklesiaIdentityRuntime) {
     moduleConfiguration: emptyModuleConfiguration(),
     moduleStorage: emptyModuleStorage(),
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     moduleServices: fakeModuleServices(),
     authorization: fakeAuthorization({}),
     runtime,
@@ -121,6 +123,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -355,6 +358,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -378,6 +382,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -403,6 +408,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -430,6 +436,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -457,6 +464,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -481,6 +489,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -507,6 +516,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime,
@@ -530,6 +540,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
         runtime,
@@ -555,6 +566,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
         runtime,
@@ -587,6 +599,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
         runtime,
@@ -620,6 +633,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
         runtime,
@@ -658,6 +672,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime: fakeRuntime(),
@@ -678,6 +693,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime: fakeRuntime(),
@@ -700,6 +716,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime: fakeRuntime(),
@@ -721,6 +738,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime: fakeRuntime(),
@@ -740,6 +758,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime: fakeRuntime(),
@@ -766,6 +785,7 @@ describe("Ekklesia API Hono application", () => {
       moduleConfiguration: emptyModuleConfiguration(),
       moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
+      health: readyHealth(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
       runtime: fakeRuntime(),
@@ -795,6 +815,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({ evaluator: { authorize: evaluatorAuthorize } }),
         runtime: fakeRuntime(),
@@ -827,6 +848,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({
           evaluator: { authorize: evaluatorAuthorize },
@@ -850,6 +872,7 @@ describe("Ekklesia API Hono application", () => {
         moduleConfiguration: emptyModuleConfiguration(),
         moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
+        health: readyHealth(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
         runtime: fakeRuntime(),

apps/api/tests/dashboard-routes.test.ts

@@ -27,6 +27,7 @@ import { createApiApp } from "../src/app.js";
 import { DASHBOARD_NAVIGATION_PATH } from "../src/dashboard-routes.js";
 import { MODULE_UI_INVENTORY_PATH } from "../src/module-ui-inventory.js";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import {
   createInMemoryModuleLifecycleStore,
   moduleLifecycleSnapshotFor,
@@ -139,6 +140,7 @@ async function install(options: InstallOptions = {}): Promise<{ app: Hono }> {
   const app = createApiApp({
     authorization: { evaluator, registry: composePlatformPermissionRegistry(modules), store },
     dashboard: createInMemoryDashboardStore(options.configuration ?? {}),
+    health: readyHealth(),
     moduleRoutes: Object.freeze([]),
     moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
     moduleServices: Object.freeze({

apps/api/tests/health-routes.test.ts

@@ -0,0 +1,371 @@
+import {
+  ANONYMOUS_PRINCIPAL,
+  type ModuleDatabase,
+  type ModuleRouteHandler,
+  type ModuleRuntimeServices,
+  parsePermissionId,
+  type RegisteredModuleHttpRoute,
+} from "@ekklesia/contracts";
+import {
+  type AuthorizationEvaluator,
+  type AuthorizationStore,
+  createPermissionRegistry,
+} from "@ekklesia/core/authorization";
+import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
+import {
+  createModuleUiPublicationRegistry,
+  EMPTY_MODULE_REALTIME_REGISTRY,
+} from "@ekklesia/core/modules";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { createApiApp } from "../src/app.js";
+import {
+  type ApiHealthOptions,
+  HEALTH_LIVE_PATH,
+  HEALTH_READY_PATH,
+  READINESS_DATABASE_TIMEOUT_MS,
+} from "../src/health-routes.js";
+import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { emptyModuleConfiguration } from "./support/in-memory-module-configuration.js";
+import { emptyModuleLifecycle } from "./support/in-memory-module-lifecycle.js";
+import { emptyModuleStorage } from "./support/in-memory-module-storage.js";
+
+const trustedOrigin = "https://dashboard.example.test";
+const modulePermission = parsePermissionId("health.status.read");
+
+/** What a real driver failure can carry, and what must therefore never reach a response. */
+const DRIVER_FAILURE_DETAIL =
+  "connect ECONNREFUSED postgresql://ekklesia:[email protected]:5432/ekklesia SELECT 1";
+
+function fakeRuntime(): EkklesiaIdentityRuntime {
+  return {
+    handleAuthRequest: vi.fn(),
+    resolvePrincipal: vi.fn().mockResolvedValue(ANONYMOUS_PRINCIPAL),
+  };
+}
+
+function fakeStore(): AuthorizationStore {
+  return {
+    createGrant: vi.fn(),
+    grantPlatformOwner: vi.fn(),
+    hasActiveGrant: vi.fn().mockResolvedValue(false),
+    isPlatformOwner: vi.fn().mockResolvedValue(false),
+    listGrantsForUser: vi.fn().mockResolvedValue({ grants: [] }),
+    revokeGrant: vi.fn(),
+    revokePlatformOwner: vi.fn(),
+  };
+}
+
+function fakeModuleServices(): ModuleRuntimeServices {
+  return Object.freeze({ database: Object.freeze({}) as unknown as ModuleDatabase });
+}
+
+function healthOptions(overrides: Partial<ApiHealthOptions> = {}) {
+  return {
+    checkDatabase: vi.fn<() => Promise<void>>().mockResolvedValue(undefined),
+    isModuleStartupComplete: vi.fn<() => boolean>().mockReturnValue(true),
+    ...overrides,
+  };
+}
+
+function buildApp(
+  health: ApiHealthOptions,
+  moduleRoutes: readonly RegisteredModuleHttpRoute[] = Object.freeze([]),
+) {
+  const evaluator: AuthorizationEvaluator = {
+    authorize: vi.fn().mockResolvedValue({ allowed: true }),
+  };
+  const runtime = fakeRuntime();
+  const app = createApiApp({
+    authorization: {
+      evaluator,
+      registry: createPermissionRegistry([
+        { baseline: "public", description: "Test permission.", id: modulePermission },
+      ]),
+      store: fakeStore(),
+    },
+    moduleRoutes,
+    moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
+    moduleServices: fakeModuleServices(),
+    moduleUi: createModuleUiPublicationRegistry([]),
+    moduleLifecycle: emptyModuleLifecycle(),
+    moduleConfiguration: emptyModuleConfiguration(),
+    moduleStorage: emptyModuleStorage(),
+    dashboard: createInMemoryDashboardStore(),
+    health,
+    runtime,
+    trustedOrigins: [trustedOrigin],
+  });
+  return { app, evaluator, runtime };
+}
+
+/** Resolves once every already-queued microtask has run, using the real `setImmediate` — the only
+ * timer functions these tests fake are `setTimeout` and `clearTimeout`. */
+function drainMicrotasks(): Promise<void> {
+  return new Promise((resolve) => setImmediate(resolve));
+}
+
+/** Whether `promise` settled with no fake time advanced at all: "promptly", made exact. */
+async function settlesWithoutWaiting(promise: Response | Promise<Response>): Promise<boolean> {
+  let settled = false;
+  void Promise.resolve(promise).then(
+    () => {
+      settled = true;
+    },
+    () => {
+      settled = true;
+    },
+  );
+  await drainMicrotasks();
+  return settled;
+}
+
+async function expectNotReady(response: Response): Promise<void> {
+  expect(response.status).toBe(503);
+  expect(response.headers.get("cache-control")).toBe("no-store");
+  expect(await response.json()).toEqual({ code: "NOT_READY" });
+}
+
+afterEach(() => {
+  vi.useRealTimers();
+});
+
+describe("GET /api/v1/health/live", () => {
+  it("returns 200 with a fixed body and Cache-Control: no-store", async () => {
+    const health = healthOptions();
+    const { app } = buildApp(health);
+
+    const response = await app.request(HEALTH_LIVE_PATH);
+
+    expect(response.status).toBe(200);
+    expect(response.headers.get("cache-control")).toBe("no-store");
+    expect(response.headers.get("content-type")).toMatch(/^application\/json/u);
+    expect(await response.json()).toEqual({ status: "live" });
+  });
+
+  it("does not consult the database or module startup, so it stays 200 while readiness is 503", async () => {
+    const health = healthOptions({
+      checkDatabase: vi.fn().mockRejectedValue(new Error(DRIVER_FAILURE_DETAIL)),
+      isModuleStartupComplete: vi.fn().mockReturnValue(false),
+    });
+    const { app } = buildApp(health);
+
+    const response = await app.request(HEALTH_LIVE_PATH);
+
+    expect(response.status).toBe(200);
+    expect(health.checkDatabase).not.toHaveBeenCalled();
+    expect(health.isModuleStartupComplete).not.toHaveBeenCalled();
+  });
+});
+
+describe("GET /api/v1/health/ready", () => {
+  it("returns 200 with a fixed body when the database answers and module startup completed", async () => {
+    const health = healthOptions();
+    const { app } = buildApp(health);
+
+    const response = await app.request(HEALTH_READY_PATH);
+
+    expect(response.status).toBe(200);
+    expect(response.headers.get("cache-control")).toBe("no-store");
+    expect(await response.json()).toEqual({ status: "ready" });
+    expect(health.checkDatabase).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns a fixed 503 when the database query fails, carrying nothing from the failure", async () => {
+    const health = healthOptions({
+      checkDatabase: vi.fn().mockRejectedValue(new Error(DRIVER_FAILURE_DETAIL)),
+    });
+    const { app } = buildApp(health);
+
+    const response = await app.request(HEALTH_READY_PATH);
+    const text = await response.clone().text();
+
+    await expectNotReady(response);
+    for (const fragment of ["ECONNREFUSED", "hunter2", "db.internal", "SELECT", "Error"]) {
+      expect(text).not.toContain(fragment);
+    }
+  });
+
+  it("treats a check that throws synchronously exactly like one that rejects", async () => {
+    const health = healthOptions({
+      checkDatabase: vi.fn(() => {
+        throw new Error(DRIVER_FAILURE_DETAIL);
+      }),
+    });
+    const { app } = buildApp(health);
+
+    await expectNotReady(await app.request(HEALTH_READY_PATH));
+  });
+
+  it("returns 503 without touching the database before module startup completed", async () => {
+    const health = healthOptions({ isModuleStartupComplete: vi.fn().mockReturnValue(false) });
+    const { app } = buildApp(health);
+
+    await expectNotReady(await app.request(HEALTH_READY_PATH));
+    expect(health.checkDatabase).not.toHaveBeenCalled();
+  });
+
+  it("returns 503 when shutdown began while the database query was in flight", async () => {
+    let startupComplete = true;
+    const health = healthOptions({
+      checkDatabase: vi.fn(async () => {
+        startupComplete = false;
+      }),
+      isModuleStartupComplete: () => startupComplete,
+    });
+    const { app } = buildApp(health);
+
+    await expectNotReady(await app.request(HEALTH_READY_PATH));
+  });
+
+  it("starts a fresh check for each sequential probe rather than caching a success", async () => {
+    const health = healthOptions();
+    const { app } = buildApp(health);
+
+    await app.request(HEALTH_READY_PATH);
+    await app.request(HEALTH_READY_PATH);
+
+    expect(health.checkDatabase).toHaveBeenCalledTimes(2);
+  });
+
+  it("reports ready for a slow query that still answers inside the bound", async () => {
+    vi.useFakeTimers({ toFake: ["setTimeout", "clearTimeout"] });
+    let answer: () => void = () => undefined;
+    const health = healthOptions({
+      checkDatabase: vi.fn(
+        () =>
+          new Promise<void>((resolve) => {
+            answer = resolve;
+          }),
+      ),
+    });
+    const { app } = buildApp(health);
+
+    const pending = app.request(HEALTH_READY_PATH);
+    await vi.advanceTimersByTimeAsync(READINESS_DATABASE_TIMEOUT_MS - 1);
+    answer();
+
+    expect((await pending).status).toBe(200);
+  });
+});
+
+describe("readiness never piles up database checks", () => {
+  it("keeps exactly one check in flight for a query that never settles, while every probe answers 503 promptly", async () => {
+    vi.useFakeTimers({ toFake: ["setTimeout", "clearTimeout"] });
+    const health = healthOptions({
+      checkDatabase: vi.fn(() => new Promise<void>(() => undefined)),
+    });
+    const { app } = buildApp(health);
+
+    // Probes arriving inside the first check's window share it and its single deadline.
+    const first = app.request(HEALTH_READY_PATH);
+    const concurrent = app.request(HEALTH_READY_PATH);
+    await drainMicrotasks();
+    expect(health.checkDatabase).toHaveBeenCalledTimes(1);
+
+    await vi.advanceTimersByTimeAsync(READINESS_DATABASE_TIMEOUT_MS);
+    await expectNotReady(await first);
+    await expectNotReady(await concurrent);
+
+    // After the deadline the query is still unsettled: no new check starts, and each probe answers
+    // without waiting out another bound.
+    for (let probe = 0; probe < 20; probe += 1) {
+      const pending = app.request(HEALTH_READY_PATH);
+      expect(await settlesWithoutWaiting(pending)).toBe(true);
+      await expectNotReady(await pending);
+    }
+    expect(health.checkDatabase).toHaveBeenCalledTimes(1);
+  });
+
+  it("starts a new check only once the timed-out query has actually settled", async () => {
+    vi.useFakeTimers({ toFake: ["setTimeout", "clearTimeout"] });
+    let settleHungQuery: (error: Error) => void = () => undefined;
+    const checkDatabase = vi
+      .fn<() => Promise<void>>()
+      .mockImplementationOnce(
+        () =>
+          new Promise<void>((_resolve, reject) => {
+            settleHungQuery = reject;
+          }),
+      )
+      .mockResolvedValue(undefined);
+    const { app } = buildApp(healthOptions({ checkDatabase }));
+
+    const first = app.request(HEALTH_READY_PATH);
+    await vi.advanceTimersByTimeAsync(READINESS_DATABASE_TIMEOUT_MS);
+    await expectNotReady(await first);
+    await expectNotReady(await app.request(HEALTH_READY_PATH));
+    expect(checkDatabase).toHaveBeenCalledTimes(1);
+
+    // The database cancels the abandoned statement; the next probe may finally ask again.
+    settleHungQuery(new Error(DRIVER_FAILURE_DETAIL));
+    await drainMicrotasks();
+
+    const recovered = await app.request(HEALTH_READY_PATH);
+    expect(recovered.status).toBe(200);
+    expect(checkDatabase).toHaveBeenCalledTimes(2);
+  });
+});
+
+describe("health route boundaries", () => {
+  it.each([
+    HEALTH_LIVE_PATH,
+    HEALTH_READY_PATH,
+  ])("%s accepts GET only, answering every other method with a fixed 405 and never checking readiness", async (path) => {
+    const health = healthOptions();
+    const { app } = buildApp(health);
+
+    for (const method of ["HEAD", "POST", "PUT", "PATCH", "DELETE"]) {
+      const response = await app.request(path, { method });
+      expect(response.status, method).toBe(405);
+      expect(response.headers.get("allow")).toBe("GET");
+      expect(response.headers.get("cache-control")).toBe("no-store");
+      expect(await response.text()).toBe("");
+    }
+    expect(health.checkDatabase).not.toHaveBeenCalled();
+    expect(health.isModuleStartupComplete).not.toHaveBeenCalled();
+  });
+
+  it.each([
+    HEALTH_LIVE_PATH,
+    HEALTH_READY_PATH,
+  ])("%s is unauthenticated: it never resolves a principal or evaluates authorization, even with a cookie", async (path) => {
+    const { app, evaluator, runtime } = buildApp(healthOptions());
+
+    const response = await app.request(path, {
+      headers: { Cookie: "better-auth.session_token=anything", Origin: trustedOrigin },
+    });
+
+    expect(response.status).toBe(200);
+    expect(runtime.resolvePrincipal).not.toHaveBeenCalled();
+    expect(runtime.handleAuthRequest).not.toHaveBeenCalled();
+    expect(evaluator.authorize).not.toHaveBeenCalled();
+  });
+
+  it('cannot be shadowed by a module, even one whose id is "health"', async () => {
+    const moduleHandler = vi.fn<ModuleRouteHandler>(
+      async () => new Response("module", { status: 200 }),
+    );
+    const moduleRoutes = ["/live", "/ready"].map(
+      (path) =>
+        Object.freeze({
+          bodyMode: "buffered",
+          handler: moduleHandler,
+          maxBodyBytes: 1024,
+          method: "GET",
+          moduleId: "health",
+          path,
+          permission: modulePermission,
+        }) as RegisteredModuleHttpRoute,
+    );
+    const { app } = buildApp(healthOptions(), moduleRoutes);
+
+    expect(await (await app.request(HEALTH_LIVE_PATH)).json()).toEqual({ status: "live" });
+    expect(await (await app.request(HEALTH_READY_PATH)).json()).toEqual({ status: "ready" });
+    expect(moduleHandler).not.toHaveBeenCalled();
+
+    // The module's own routes still live where every module route lives, and only there.
+    const moduleResponse = await app.request("/api/v1/modules/health/ready");
+    expect(await moduleResponse.text()).toBe("module");
+    expect(moduleHandler).toHaveBeenCalledTimes(1);
+  });
+});

apps/api/tests/lifecycle.test.ts

@@ -36,6 +36,11 @@ import { PermissionRegistryError } from "@ekklesia/core/authorization";
 import { createApiApp } from "../src/app.js";
 import { createApiRuntimeConfig } from "../src/config.js";
 import { DisplayHostAssetError } from "../src/display-host-assets.js";
+import {
+  HEALTH_LIVE_PATH,
+  HEALTH_READY_PATH,
+  READINESS_DATABASE_TIMEOUT_MS,
+} from "../src/health-routes.js";
 import { installShutdownSignalHandlers, startApi } from "../src/server.js";
 
 function validConfig() {
@@ -447,6 +452,36 @@ describe("Ekklesia API shutdown lifecycle", () => {
     expect(poolEnd).toHaveBeenCalledTimes(1);
   });
 
+  it("answers readiness with one bounded ping on the shared pool, and turns it 503 the moment shutdown begins", async () => {
+    const query = emptyQuery();
+    poolConstructor.mockImplementation(function fakePool() {
+      return { end: vi.fn().mockResolvedValue(undefined), on: vi.fn(), query };
+    });
+    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
+    mockSuccessfulServe();
+
+    const running = await startApi(validConfig());
+    query.mockClear();
+
+    const ready = await running.app.request(HEALTH_READY_PATH);
+    expect(ready.status).toBe(200);
+    expect(query).toHaveBeenCalledTimes(1);
+    // The statement timeout is server-side and scoped to this one transaction, so PostgreSQL itself
+    // cancels a stalled ping rather than the route merely abandoning it.
+    expect(query).toHaveBeenCalledWith(
+      `BEGIN READ ONLY; SET LOCAL statement_timeout = ${READINESS_DATABASE_TIMEOUT_MS}; SELECT 1; COMMIT`,
+    );
+
+    const shutdown = running.shutdown();
+    const draining = await running.app.request(HEALTH_READY_PATH);
+    expect(draining.status).toBe(503);
+    expect(await draining.json()).toEqual({ code: "NOT_READY" });
+    // Draining is not dead: liveness still answers while in-flight requests finish.
+    expect((await running.app.request(HEALTH_LIVE_PATH)).status).toBe(200);
+    expect(query).toHaveBeenCalledTimes(1);
+    await shutdown;
+  });
+
   it("keeps shutdown idempotent for calls made after the first has already resolved", async () => {
     const poolEnd = vi.fn().mockResolvedValue(undefined);
     poolConstructor.mockImplementation(function fakePool() {

apps/api/tests/module-configuration-routes.test.ts

@@ -35,6 +35,7 @@ import { CORE_MUTATION_MAX_BODY_BYTES } from "../src/body-limits.js";
 import { MODULE_CONFIGURATION_PATH } from "../src/module-configuration-routes.js";
 import { MODULE_LIFECYCLE_PATH } from "../src/module-lifecycle-routes.js";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import {
   createFakeModuleSecretSource,
   createInMemoryModuleConfigurationStore,
@@ -189,6 +190,7 @@ async function install(options: InstallOptions = {}): Promise<Installation> {
       store: authorizationStore,
     },
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     moduleConfiguration: {
       bootSettings,
       discoveredModules: modules,

apps/api/tests/module-display-routes.test.ts

@@ -38,6 +38,7 @@ import { moduleRealtimeBaseUrl } from "../src/module-realtime-routes.js";
 import { MODULE_UI_INVENTORY_PATH } from "../src/module-ui-inventory.js";
 import { moduleDisplayUiArtifactUrl } from "../src/module-ui-routes.js";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { moduleConfigurationOptionFor } from "./support/in-memory-module-configuration.js";
 import {
   createInMemoryModuleLifecycleStore,
@@ -198,6 +199,7 @@ async function install(options: InstallOptions): Promise<Installation> {
       store: fakeAuthorizationStore(),
     },
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     ...(moduleUi.listDisplays().length > 0 && options.withAssets !== false
       ? { displayHostAssets: options.assets ?? displayHostAssets }
       : {}),

apps/api/tests/module-http-routes.test.ts

@@ -23,6 +23,7 @@ import {
 } from "@ekklesia/core/modules";
 import { describe, expect, it, vi } from "vitest";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { createApiApp } from "../src/app.js";
 import {
   canonicalizeVaryHeader,
@@ -123,6 +124,7 @@ function buildModuleApp(options: {
     moduleConfiguration: emptyModuleConfiguration(),
     moduleStorage: emptyModuleStorage(),
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     runtime,
     trustedOrigins: options.trustedOrigins ?? [trustedOrigin],
   });

apps/api/tests/module-lifecycle-routes.test.ts

@@ -33,6 +33,7 @@ import { CORE_MUTATION_MAX_BODY_BYTES } from "../src/body-limits.js";
 import { MODULE_LIFECYCLE_PATH } from "../src/module-lifecycle-routes.js";
 import { MODULE_UI_INVENTORY_PATH } from "../src/module-ui-inventory.js";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { createInMemoryModuleLifecycleStore } from "./support/in-memory-module-lifecycle.js";
 import { moduleConfigurationOptionFor } from "./support/in-memory-module-configuration.js";
 import { moduleStorageOptionFor } from "./support/in-memory-module-storage.js";
@@ -171,6 +172,7 @@ async function install(options: InstallOptions = {}): Promise<Installation> {
       store: authorizationStore,
     },
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     moduleConfiguration: moduleConfigurationOptionFor(modules),
     moduleStorage: moduleStorageOptionFor(modules),
     moduleLifecycle: {

apps/api/tests/module-ui-host-e2e.test.ts

@@ -36,6 +36,7 @@ import {
 } from "@ekklesia/shell";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { createApiApp } from "../src/app.js";
 import { createDisplayHostAssets } from "../src/display-host-assets.js";
 import {
@@ -288,6 +289,7 @@ async function startHarness(options: HarnessOptions = {}): Promise<Harness> {
     moduleConfiguration: moduleConfigurationOptionFor(modules),
     moduleStorage: moduleStorageOptionFor(modules),
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     runtime,
     trustedOrigins: ["https://dashboard.example.test"],
   });

apps/api/tests/module-ui-inventory.test.ts

@@ -25,6 +25,7 @@ import {
 import type { Hono } from "hono";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { createApiApp } from "../src/app.js";
 import { moduleApiBaseUrl } from "../src/module-http-routes.js";
 import { moduleRealtimeBaseUrl } from "../src/module-realtime-routes.js";
@@ -208,6 +209,7 @@ async function install(options: InstallOptions): Promise<Installation> {
     moduleConfiguration: moduleConfigurationOptionFor(modules),
     moduleStorage: moduleStorageOptionFor(modules),
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     runtime,
     trustedOrigins: [trustedOrigin],
   });

apps/api/tests/module-ui-routes.test.ts

@@ -21,6 +21,7 @@ import { Window } from "happy-dom";
 import type { Hono } from "hono";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
+import { readyHealth } from "./support/ready-health.js";
 import { createApiApp } from "../src/app.js";
 import { createDisplayHostAssets } from "../src/display-host-assets.js";
 import {
@@ -255,6 +256,7 @@ async function install(
     moduleConfiguration: moduleConfigurationOptionFor(modules),
     moduleStorage: moduleStorageOptionFor(modules),
     dashboard: createInMemoryDashboardStore(),
+    health: readyHealth(),
     runtime,
     trustedOrigins: [trustedOrigin],
   });

apps/api/tests/support/ready-health.ts

@@ -0,0 +1,10 @@
+import type { ApiHealthOptions } from "../../src/health-routes.js";
+
+/** Readiness inputs for a composition whose tests do not exercise health: the database answers and
+ * module startup has completed. Health behavior itself is tested in `../health-routes.test.ts`. */
+export function readyHealth(): ApiHealthOptions {
+  return {
+    checkDatabase: async () => undefined,
+    isModuleStartupComplete: () => true,
+  };
+}