feat(monitoring): add stats counters API and public status page

Add GET /api/stats exposing cumulative counters (feeds created/deleted,
emails received/rejected, recent date-times) plus live values (active
feeds, active WebSub subscriptions). Counters persist in a stats:counters
KV singleton and are incremented at the email-processing chokepoint and
feed create/delete paths. Replace the / → /admin redirect with a public
status page rendering these figures with a link to the admin.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CLAUDE.md

@@ -32,7 +32,9 @@ Single Cloudflare Worker built with Hono. Routes:
 
 | Method                               | Path                                                                   | Purpose |
 | ------------------------------------ | ---------------------------------------------------------------------- | ------- |
+| `GET /`                              | Public status page (monitoring counters + link to admin)               |
 | `POST /api/inbound`                  | Webhook from ForwardEmail; IP-allowlisted to their MX sources          |
+| `GET /api/stats`                     | Public monitoring counters (JSON)                                      |
 | `GET /rss/:feedId`                   | Public RSS 2.0 feed                                                    |
 | `GET /atom/:feedId`                  | Public Atom feed (with WebSub hub header)                              |
 | `GET /entries/:feedId/:entryId`      | Individual email HTML view                                             |
@@ -56,6 +58,8 @@ src/
     entries.ts              # Single email HTML view
     files.ts                # R2 attachment serving
     hub.ts                  # WebSub hub
+    home.tsx                # Public status page (GET /)
+    stats.ts                # Monitoring counters API (GET /api/stats)
     admin.tsx               # Admin UI entrypoint (hono/jsx)
     admin/                  # Admin sub-modules
       feeds.tsx             # Feeds CRUD UI
@@ -99,6 +103,7 @@ All data lives in the `EMAIL_STORAGE` KV namespace:
 | `feed:<feedId>:metadata`         | `{ emails: Array<{ key, subject, receivedAt, size?, attachmentIds? }> }` |
 | `feed:<feedId>:<timestamp>`      | Full `EmailData`                                                         |
 | `websub:<feedId>:<callbackHash>` | `WebSubSubscription`                                                     |
+| `stats:counters`                 | `Counters` (cumulative monitoring counters singleton)                    |
 
 `src/lib/storage.ts` contains key-builder helpers — use them; don't inline key strings in routes.
 

README.md

@@ -41,6 +41,7 @@ Common path:
 2. The Worker resolves the feed from the recipient address and stores the email in KV.
 3. `https://yourdomain.com/rss/:feedId` renders RSS from stored items.
 4. `/admin` provides feed management and email deletion.
+5. `https://yourdomain.com/` shows a public status page with monitoring counters and a link to the admin.
 
 Main routes:
 
@@ -50,6 +51,27 @@ Main routes:
 - `src/routes/atom.ts`: Atom feed rendering
 - `src/routes/files.ts`: attachment file serving from R2
 - `src/routes/admin.ts`: admin UI + feed CRUD
+- `src/routes/home.tsx`: public status page (`GET /`)
+- `src/routes/stats.ts`: monitoring counters API (`GET /api/stats`)
+
+### Monitoring
+
+`GET /api/stats` returns JSON counters (public, no auth) for uptime/monitoring tools:
+
+| Field                         | Meaning                                                  |
+| ----------------------------- | -------------------------------------------------------- |
+| `active_feeds`                | Feeds currently configured (live)                        |
+| `feeds_created`               | Total feeds ever created (cumulative)                    |
+| `feeds_deleted`               | Total feeds ever deleted (cumulative)                    |
+| `emails_received`             | Total emails ingested successfully (cumulative)          |
+| `emails_rejected`             | Total emails rejected during validation (cumulative)     |
+| `websub_subscriptions_active` | Active WebSub subscriptions (live)                       |
+| `last_email_at`               | ISO 8601 date-time of the last ingested email            |
+| `last_feed_created_at`        | ISO 8601 date-time of the last feed creation             |
+| `first_seen`                  | ISO 8601 date-time the instance first recorded a counter |
+
+The same figures are rendered on the public status page at `GET /`. Cumulative counters
+are persisted in the `EMAIL_STORAGE` KV under the `stats:counters` key.
 
 ## Requirements
 

src/config/constants.ts

@@ -21,3 +21,6 @@ export const MAX_LEASE_SECONDS = 30 * 24 * 3600; // 30 days
 
 /** KV key for the global feed list. */
 export const FEEDS_LIST_KEY = "feeds:list";
+
+/** KV key for the monitoring counters singleton. */
+export const STATS_KEY = "stats:counters";

src/index.ts

@@ -6,6 +6,8 @@ import { handle as handleAtom } from "./routes/atom";
 import { handle as handleAdmin } from "./routes/admin";
 import { handle as handleEntry } from "./routes/entries";
 import { handle as handleFiles } from "./routes/files";
+import { handle as handleStats } from "./routes/stats";
+import { handle as handleHome } from "./routes/home";
 import { hubRouter } from "./routes/hub";
 import { handleCloudflareEmail } from "./lib/cloudflare-email";
 import { Env } from "./types";
@@ -15,6 +17,7 @@ import {
   purgeExpiredFeeds,
   removeFeedsFromListBulk,
 } from "./routes/admin/helpers";
+import { bumpCounters } from "./utils/stats";
 import { FORWARD_EMAIL_IPS_CACHE_TTL_MS } from "./config/constants";
 
 type AppEnv = { Bindings: Env };
@@ -137,6 +140,9 @@ api.use("/inbound", async (c, next) => {
 // API routes (inbound webhook)
 api.post("/inbound", handleInbound);
 
+// Public monitoring stats (JSON)
+api.get("/stats", handleStats);
+
 // RSS feed routes (public)
 rss.get("/:feedId", handleRSS);
 
@@ -164,8 +170,8 @@ app.route("/hub", hubRouter);
 // Health check endpoint for monitoring
 app.get("/health", (c) => c.json({ status: "ok", timestamp: Date.now() }));
 
-// Root path redirects to admin dashboard
+// Public status page (counters + link to admin)
-app.get("/", (c) => c.redirect("/admin"));
+app.get("/", handleHome);
 
 // Catch-all for 404s
 app.all("*", (c) => c.text("Not Found", 404));
@@ -192,6 +198,9 @@ export default {
     }
     if (expiredIds.length > 0) {
       await removeFeedsFromListBulk(env.EMAIL_STORAGE, expiredIds);
+      await bumpCounters(env.EMAIL_STORAGE, {
+        feeds_deleted: expiredIds.length,
+      });
       logger.info("Feed TTL cleanup", { deleted: expiredIds.length });
     }
   },

src/lib/email-processor.test.ts

@@ -6,6 +6,7 @@ import {
   ProcessEmailInput,
   RawAttachment,
 } from "./email-processor";
+import { getCounters } from "../utils/stats";
 
 const VALID_FEED_ID = "apple.mountain.42";
 const VALID_TO = `${VALID_FEED_ID}@test.getmynews.app`;
@@ -467,3 +468,31 @@ describe("processEmail — attachments", () => {
     expect(mockR2._has(oldAttachmentId)).toBe(false);
   });
 });
+
+describe("processEmail — monitoring counters", () => {
+  it("increments emails_received and sets last_email_at on success", async () => {
+    const env = createMockEnv();
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({}),
+    );
+
+    await processEmail(makeInput(), env as any);
+
+    const counters = await getCounters(env.EMAIL_STORAGE as any);
+    expect(counters.emails_received).toBe(1);
+    expect(counters.emails_rejected).toBe(0);
+    expect(counters.last_email_at).toBeDefined();
+  });
+
+  it("increments emails_rejected when validation fails", async () => {
+    const env = createMockEnv();
+
+    // No feed config → 404 rejection
+    await processEmail(makeInput(), env as any);
+
+    const counters = await getCounters(env.EMAIL_STORAGE as any);
+    expect(counters.emails_rejected).toBe(1);
+    expect(counters.emails_received).toBe(0);
+  });
+});

src/lib/email-processor.ts

@@ -7,6 +7,7 @@ import {
   FeedMetadata,
 } from "../types";
 import { notifySubscribers } from "../utils/websub";
+import { bumpCounters } from "../utils/stats";
 import { logger } from "./logger";
 import { FEED_MAX_BYTES } from "../config/constants";
 
@@ -248,8 +249,15 @@ export async function processEmail(
   ctx?: ExecutionContext,
 ): Promise<Response> {
   const validation = await validateEmail(input, env);
-  if (!validation.ok) return validation.response;
+  if (!validation.ok) {
+    await bumpCounters(env.EMAIL_STORAGE, { emails_rejected: 1 });
+    return validation.response;
+  }
 
   await storeEmail(validation.feedId, input, env, ctx);
+  await bumpCounters(env.EMAIL_STORAGE, {
+    emails_received: 1,
+    last_email_at: new Date().toISOString(),
+  });
   return new Response("Email processed successfully", { status: 200 });
 }

src/routes/admin/feeds.tsx

@@ -2,6 +2,7 @@ import { Hono } from "hono";
 import { z } from "zod";
 import { Env, FeedConfig, FeedMetadata } from "../../types";
 import { generateFeedId } from "../../utils/id-generator";
+import { bumpCounters } from "../../utils/stats";
 import { waitUntilSafe } from "../../utils/worker";
 import { feedRssUrl, feedEmailAddress } from "../../utils/urls";
 import { logger } from "../../lib/logger";
@@ -191,6 +192,11 @@ feedsRouter.post("/create", async (c) => {
       expiresAt,
     );
 
+    await bumpCounters(emailStorage, {
+      feeds_created: 1,
+      last_feed_created_at: new Date().toISOString(),
+    });
+
     if (isJson) {
       return c.json({
         feedId,
@@ -528,7 +534,10 @@ feedsRouter.post("/:feedId/delete", async (c) => {
 
   try {
     await deleteFeedFast(emailStorage, feedId);
-    await removeFeedFromList(emailStorage, feedId);
+    const removed = await removeFeedFromList(emailStorage, feedId);
+    if (removed) {
+      await bumpCounters(emailStorage, { feeds_deleted: 1 });
+    }
 
     waitUntilSafe(
       c,
@@ -658,6 +667,9 @@ feedsRouter.post("/bulk-delete", async (c) => {
       }
 
       const deletedFeedIds = await removeFeedsFromListBulk(emailStorage, okIds);
+      if (deletedFeedIds.length > 0) {
+        await bumpCounters(emailStorage, { feeds_deleted: deletedFeedIds.length });
+      }
 
       const removed = new Set(deletedFeedIds);
       okIds.forEach((feedId) => {
@@ -707,6 +719,9 @@ feedsRouter.post("/bulk-delete", async (c) => {
     }
 
     const deletedFeedIds = await removeFeedsFromListBulk(emailStorage, okIds);
+    if (deletedFeedIds.length > 0) {
+      await bumpCounters(emailStorage, { feeds_deleted: deletedFeedIds.length });
+    }
 
     return c.redirect(
       `${redirectBase}&message=bulkDeleted&count=${deletedFeedIds.length}`,

src/routes/admin/ui.tsx

@@ -8,10 +8,11 @@ const designSystem = [variablesCss, layoutCss, componentsCss, utilitiesCss].join
 
 type LayoutProps = {
   title: string;
+  label?: string;
   children: import("hono/jsx").Child;
 };
 
-export const Layout = ({ title, children }: LayoutProps) => {
+export const Layout = ({ title, label = "admin", children }: LayoutProps) => {
   return (
     <html>
       <head>
@@ -38,7 +39,7 @@ export const Layout = ({ title, children }: LayoutProps) => {
           <a href="https://kill-the.news/" class="site-header-logo" target="_blank" rel="noopener">
             kill-the-news
           </a>
-          <span class="site-header-label">admin</span>
+          <span class="site-header-label">{label}</span>
         </header>
         {children}
         <footer class="site-footer">

src/routes/home.tsx

@@ -0,0 +1,57 @@
+import { Context } from "hono";
+import { Env } from "../types";
+import { getStats } from "../utils/stats";
+import { Layout } from "./admin/ui";
+
+function formatDateTime(iso?: string): string {
+  if (!iso) return "Never";
+  const date = new Date(iso);
+  if (Number.isNaN(date.getTime())) return "Never";
+  return date.toISOString().replace("T", " ").replace(/\.\d+Z$/, " UTC");
+}
+
+export async function handle(c: Context<{ Bindings: Env }>): Promise<Response> {
+  const stats = await getStats(c.env);
+
+  const cards: Array<{ label: string; value: string | number; time?: boolean }> =
+    [
+      { label: "Active feeds", value: stats.active_feeds },
+      { label: "Feeds created", value: stats.feeds_created },
+      { label: "Feeds deleted", value: stats.feeds_deleted },
+      { label: "Emails received", value: stats.emails_received },
+      { label: "Emails rejected", value: stats.emails_rejected },
+      { label: "WebSub subscribers", value: stats.websub_subscriptions_active },
+      { label: "Last email", value: formatDateTime(stats.last_email_at), time: true },
+      { label: "Last feed created", value: formatDateTime(stats.last_feed_created_at), time: true },
+      { label: "Online since", value: formatDateTime(stats.first_seen), time: true },
+    ];
+
+  return c.html(
+    <Layout title="Status" label="status">
+      <div class="container fade-in">
+        <div class="header-with-actions">
+          <div class="header-title">
+            <h1>kill-the-news</h1>
+            <p>Instance status &amp; monitoring</p>
+          </div>
+          <div class="header-actions">
+            <a href="/admin" class="button">
+              Go to admin
+            </a>
+          </div>
+        </div>
+
+        <div class="stats-grid">
+          {cards.map((card) => (
+            <div class="card stat-card">
+              <span class={`stat-value${card.time ? " stat-value-time" : ""}`}>
+                {card.value}
+              </span>
+              <span class="stat-label">{card.label}</span>
+            </div>
+          ))}
+        </div>
+      </div>
+    </Layout>,
+  );
+}

src/routes/stats.test.ts

@@ -0,0 +1,66 @@
+import { describe, it, expect } from "vitest";
+import worker from "../index";
+import { createMockEnv } from "../test/setup";
+import { bumpCounters } from "../utils/stats";
+import { FEEDS_LIST_KEY } from "../config/constants";
+import type { Env, StatsResponse } from "../types";
+
+function req(path: string, init: RequestInit = {}): Request {
+  return new Request(`https://test.getmynews.app${path}`, init);
+}
+
+describe("GET /api/stats", () => {
+  it("returns zeroed stats for a fresh instance", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const res = await worker.fetch(req("/api/stats"), env);
+    expect(res.status).toBe(200);
+    const body = (await res.json()) as StatsResponse;
+    expect(body).toMatchObject({
+      feeds_created: 0,
+      feeds_deleted: 0,
+      emails_received: 0,
+      emails_rejected: 0,
+      active_feeds: 0,
+      websub_subscriptions_active: 0,
+    });
+  });
+
+  it("reflects persisted counters and live values", async () => {
+    const env = createMockEnv() as unknown as Env;
+    await env.EMAIL_STORAGE.put(
+      FEEDS_LIST_KEY,
+      JSON.stringify({ feeds: [{ id: "a", title: "A" }] }),
+    );
+    await env.EMAIL_STORAGE.put("websub:a:hash", "{}");
+    await bumpCounters(env.EMAIL_STORAGE, {
+      emails_received: 3,
+      emails_rejected: 1,
+      feeds_created: 1,
+    });
+
+    const res = await worker.fetch(req("/api/stats"), env);
+    const body = (await res.json()) as StatsResponse;
+    expect(body.active_feeds).toBe(1);
+    expect(body.websub_subscriptions_active).toBe(1);
+    expect(body.emails_received).toBe(3);
+    expect(body.emails_rejected).toBe(1);
+    expect(body.feeds_created).toBe(1);
+  });
+});
+
+describe("GET / (public status page)", () => {
+  it("returns an HTML status page with counters and an admin link", async () => {
+    const env = createMockEnv() as unknown as Env;
+    await bumpCounters(env.EMAIL_STORAGE, { emails_received: 7 });
+
+    const res = await worker.fetch(req("/"), env);
+    expect(res.status).toBe(200);
+    expect(res.headers.get("Content-Type")).toContain("text/html");
+
+    const html = await res.text();
+    expect(html).toContain('href="/admin"');
+    expect(html).toContain("Active feeds");
+    expect(html).toContain("Emails received");
+    expect(html).toContain("7");
+  });
+});

src/routes/stats.ts

@@ -0,0 +1,7 @@
+import { Context } from "hono";
+import { Env } from "../types";
+import { getStats } from "../utils/stats";
+
+export async function handle(c: Context<{ Bindings: Env }>): Promise<Response> {
+  return c.json(await getStats(c.env));
+}

src/styles/components.css

@@ -1010,3 +1010,36 @@ table.table code {
   opacity: 0.6;
   pointer-events: none;
 }
+
+/* Status page — stat cards grid */
+.stats-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
+  gap: var(--spacing-md);
+  margin-bottom: var(--spacing-lg);
+}
+
+.stat-card {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-xs);
+  margin-bottom: 0;
+}
+
+.stat-value {
+  font-size: 2rem;
+  font-weight: 700;
+  color: var(--color-primary);
+  line-height: 1.1;
+}
+
+.stat-value-time {
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--color-text-primary);
+}
+
+.stat-label {
+  font-size: 0.85rem;
+  color: var(--color-text-secondary);
+}

src/types/index.ts

@@ -69,6 +69,23 @@ export interface FeedListItem {
   expires_at?: number; // Cached from FeedConfig to avoid per-feed KV reads
 }
 
+// Cumulative monitoring counters (persisted as a KV singleton)
+export interface Counters {
+  feeds_created: number;
+  feeds_deleted: number;
+  emails_received: number;
+  emails_rejected: number;
+  last_email_at?: string; // ISO 8601
+  last_feed_created_at?: string; // ISO 8601
+  first_seen?: string; // ISO 8601 — first time counters were written (instance start)
+}
+
+// Monitoring API response: persisted counters + live-computed values
+export interface StatsResponse extends Counters {
+  active_feeds: number;
+  websub_subscriptions_active: number;
+}
+
 // WebSub (PubSubHubbub) subscription configuration
 export interface WebSubSubscription {
   callbackUrl: string;

src/utils/stats.test.ts

@@ -0,0 +1,122 @@
+import { describe, it, expect } from "vitest";
+import { createMockEnv } from "../test/setup";
+import {
+  getCounters,
+  bumpCounters,
+  countKeysByPrefix,
+  getStats,
+} from "./stats";
+import { STATS_KEY, FEEDS_LIST_KEY } from "../config/constants";
+import { Env } from "../types";
+
+describe("stats helper", () => {
+  it("returns zeroed counters when nothing is stored", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const counters = await getCounters(env.EMAIL_STORAGE);
+    expect(counters).toMatchObject({
+      feeds_created: 0,
+      feeds_deleted: 0,
+      emails_received: 0,
+      emails_rejected: 0,
+    });
+    expect(counters.first_seen).toBeUndefined();
+  });
+
+  it("accumulates numeric deltas across bumps", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const kv = env.EMAIL_STORAGE;
+
+    await bumpCounters(kv, { emails_received: 1 });
+    await bumpCounters(kv, { emails_received: 2, emails_rejected: 1 });
+    await bumpCounters(kv, { feeds_created: 1, feeds_deleted: 3 });
+
+    const counters = await getCounters(kv);
+    expect(counters.emails_received).toBe(3);
+    expect(counters.emails_rejected).toBe(1);
+    expect(counters.feeds_created).toBe(1);
+    expect(counters.feeds_deleted).toBe(3);
+  });
+
+  it("overwrites date-time fields and sets first_seen once", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const kv = env.EMAIL_STORAGE;
+
+    await bumpCounters(kv, {
+      emails_received: 1,
+      last_email_at: "2026-01-01T00:00:00.000Z",
+    });
+    const first = await getCounters(kv);
+    const firstSeen = first.first_seen;
+    expect(firstSeen).toBeDefined();
+    expect(first.last_email_at).toBe("2026-01-01T00:00:00.000Z");
+
+    await bumpCounters(kv, {
+      emails_received: 1,
+      last_email_at: "2026-02-02T00:00:00.000Z",
+    });
+    const second = await getCounters(kv);
+    expect(second.last_email_at).toBe("2026-02-02T00:00:00.000Z");
+    expect(second.first_seen).toBe(firstSeen);
+  });
+
+  it("counts keys by prefix", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const kv = env.EMAIL_STORAGE;
+    await kv.put("websub:a:1", "{}");
+    await kv.put("websub:a:2", "{}");
+    await kv.put("feed:x:config", "{}");
+
+    expect(await countKeysByPrefix(kv, "websub:")).toBe(2);
+    expect(await countKeysByPrefix(kv, "missing:")).toBe(0);
+  });
+
+  it("getStats combines persisted counters with live values", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const kv = env.EMAIL_STORAGE;
+
+    await kv.put(
+      FEEDS_LIST_KEY,
+      JSON.stringify({
+        feeds: [
+          { id: "a", title: "A" },
+          { id: "b", title: "B" },
+        ],
+      }),
+    );
+    await kv.put("websub:a:1", "{}");
+    await bumpCounters(kv, { emails_received: 5, feeds_created: 2 });
+
+    const stats = await getStats(env);
+    expect(stats.active_feeds).toBe(2);
+    expect(stats.websub_subscriptions_active).toBe(1);
+    expect(stats.emails_received).toBe(5);
+    expect(stats.feeds_created).toBe(2);
+  });
+
+  it("never throws on a failing KV (counters are best-effort)", async () => {
+    const brokenKv = {
+      get: async () => {
+        throw new Error("kv down");
+      },
+      put: async () => {
+        throw new Error("kv down");
+      },
+    } as unknown as KVNamespace;
+
+    await expect(
+      bumpCounters(brokenKv, { emails_received: 1 }),
+    ).resolves.toBeUndefined();
+    expect(await getCounters(brokenKv)).toMatchObject({ emails_received: 0 });
+    expect(await countKeysByPrefix(brokenKv, "websub:")).toBe(0);
+  });
+
+  it("persists under the stats KV key", async () => {
+    const env = createMockEnv() as unknown as Env;
+    const kv = env.EMAIL_STORAGE;
+    await bumpCounters(kv, { feeds_created: 1 });
+    const raw = (await kv.get(STATS_KEY, { type: "json" })) as {
+      feeds_created: number;
+    };
+    expect(raw.feeds_created).toBe(1);
+  });
+});

src/utils/stats.ts

@@ -0,0 +1,84 @@
+import { Counters, Env, StatsResponse } from "../types";
+import { STATS_KEY } from "../config/constants";
+import { logger } from "../lib/logger";
+import { listAllFeeds } from "../routes/admin/helpers";
+
+const EMPTY_COUNTERS: Counters = {
+  feeds_created: 0,
+  feeds_deleted: 0,
+  emails_received: 0,
+  emails_rejected: 0,
+};
+
+export async function getCounters(kv: KVNamespace): Promise<Counters> {
+  try {
+    const stored = (await kv.get(STATS_KEY, {
+      type: "json",
+    })) as Counters | null;
+    return { ...EMPTY_COUNTERS, ...(stored || {}) };
+  } catch (error) {
+    logger.error("Error reading counters", { error: String(error) });
+    return { ...EMPTY_COUNTERS };
+  }
+}
+
+/**
+ * Read-modify-write the counters singleton. KV has no atomic increment, so
+ * concurrent invocations can lose updates — accepted given KV's eventual
+ * consistency and this app's low volume (see email-processor.ts storeEmail).
+ * Never throws: counter failures must not break ingestion or admin flows.
+ */
+export async function bumpCounters(
+  kv: KVNamespace,
+  changes: Partial<Omit<Counters, "first_seen">>,
+): Promise<void> {
+  try {
+    const current = await getCounters(kv);
+
+    current.feeds_created += changes.feeds_created ?? 0;
+    current.feeds_deleted += changes.feeds_deleted ?? 0;
+    current.emails_received += changes.emails_received ?? 0;
+    current.emails_rejected += changes.emails_rejected ?? 0;
+    if (changes.last_email_at) current.last_email_at = changes.last_email_at;
+    if (changes.last_feed_created_at)
+      current.last_feed_created_at = changes.last_feed_created_at;
+    if (!current.first_seen) current.first_seen = new Date().toISOString();
+
+    await kv.put(STATS_KEY, JSON.stringify(current));
+  } catch (error) {
+    logger.error("Error updating counters", { error: String(error) });
+  }
+}
+
+export async function countKeysByPrefix(
+  kv: KVNamespace,
+  prefix: string,
+): Promise<number> {
+  let total = 0;
+  let cursor: string | undefined;
+  try {
+    do {
+      const listed = await kv.list({ prefix, cursor, limit: 1000 });
+      total += listed.keys.length;
+      cursor = listed.list_complete ? undefined : listed.cursor;
+    } while (cursor);
+  } catch (error) {
+    logger.error("Error counting keys", { prefix, error: String(error) });
+  }
+  return total;
+}
+
+export async function getStats(env: Env): Promise<StatsResponse> {
+  const kv = env.EMAIL_STORAGE;
+  const [counters, feeds, websubCount] = await Promise.all([
+    getCounters(kv),
+    listAllFeeds(kv),
+    countKeysByPrefix(kv, "websub:"),
+  ]);
+
+  return {
+    ...counters,
+    active_feeds: feeds.length,
+    websub_subscriptions_active: websubCount,
+  };
+}