feat(admin): metriques d'utilisation (derive DB + AnalyticsEvent)

PR 3 du chantier admin. Tableau de bord metriques : snapshot de compteurs
+ series temporelles journalieres.

Schema (migration admin_metrics) :
- AnalyticsEvent (type String libre, actorType/actorId sans FK, context Json,
  index [type, created_at]) + WorkerHeartbeat (cable en PR 4).
- colonnes createdAt @default(now()) sur UserProfile / Recipe / Planning /
  PlanningItem (lecture admin uniquement ; lignes existantes = timestamp de
  la migration).

Instrumentation (lib/analytics.service.ts, fire-and-forget) :
- analytics.recordEvent(type, {actorId?, context?}) : retourne void, insert
  detache, echec loggue+avale, jamais de latence sur la requete.
- points d'appel : user.signup, recipe.created, recipe.imported,
  planning.item_added, tech_step.correction_submitted, shopping_list.viewed.

API : GET /admin/metrics?days= (7-365, defaut 30, requireAdmin) ->
admin-metrics.service.ts. bucketByDay pur (zero-remplissage, teste sans
base). MetricsView dans packages/shared.

Front : DashboardPage (tuiles KPI + un graphe recharts par serie + listes
recettes-par-source / evenements), logique pure dans dashboard.ts, i18n
admin.dashboard.*. AdminApiClient.getMetrics.

reset-db.ts truncate analytics_events + worker_heartbeats.
Tests : Mocha admin-metrics.test.ts (bucketByDay pur x2 verts ; snapshot,
series zero-remplies, event user.signup fire-and-forget) ; Cypress
dashboard.cy.ts (2 verts). specs/backend-architecture.md : section admin.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.env.example

@@ -15,6 +15,27 @@ JWT_SECRET=changeme-generate-a-real-random-secret-at-least-32-chars
 # (docker-compose.yml), serving both the API and the built frontend.
 # APP_PORT=3000
 
+# --- Admin application (apps/admin-web + the /admin/* API surface) ---------
+# All optional: an instance that doesn't run the admin app needs none of
+# these. `requireAdmin` fails closed when ADMIN_JWT_SECRET is unset, so
+# leaving it out simply disables every /admin/* route.
+#
+# Secret for the admin session JWT — MUST be different from JWT_SECRET so an
+# end-user token can never be replayed against /admin/*. Generate your own
+# the same way as JWT_SECRET above.
+# ADMIN_JWT_SECRET=changeme-generate-a-real-random-secret-at-least-32-chars
+# Origin apps/admin-web is served from, added to the CORS allow-list.
+# ADMIN_CORS_ORIGIN=http://localhost:5174
+# Host port for the Docker `admin-web` service (static nginx serving the
+# built admin frontend).
+# ADMIN_WEB_PORT=3001
+# Optional — read only by `src/scripts/create-admin.ts` when its --email /
+# --password / --name flags are omitted (e.g. to bootstrap the first admin
+# from inside the container). Never read by the running server.
+# ADMIN_INITIAL_EMAIL=ops@example.com
+# ADMIN_INITIAL_PASSWORD=changeme-at-least-8-chars
+# ADMIN_INITIAL_NAME=Ops
+
 # Optional — only set this to false if THIS deployment is served over
 # plain HTTP (no TLS in front of it). Left unset, the session cookie
 # requires HTTPS (Secure attribute) as it should for a real deployment;

.github/workflows/ci.yml

@@ -19,6 +19,10 @@ env:
   # exercise the success path (matching secret), not just the "unset"
   # rejection every environment that doesn't set this gets by default.
   INTERNAL_WORKER_SECRET: "ci-only-worker-secret-not-used-anywhere-else-32chars+"
+  # Same reasoning — lets admin-auth.test.ts exercise the admin login
+  # success path + the requireAdmin-guarded routes, not just the "no admin
+  # secret configured -> 401" path.
+  ADMIN_JWT_SECRET: "ci-only-admin-secret-not-used-anywhere-else-32chars+"
   # Shared between the `test` job's own uvicorn step (below) and apps/api's
   # IntentServiceClient — see the `test` job for why this can't be a
   # `services:` container like postgres above (GitHub Actions can only pull
@@ -173,3 +177,10 @@ jobs:
       # `component.devServer`), unlike `e2e` above which needs the real app
       # running first.
       - run: pnpm --filter web cy:run:component
+      # The admin app's own Cypress suite (`apps/admin-web`) — its own dev
+      # server on :5174, all `/admin/*` calls mocked via `cy.intercept`
+      # (no live backend needed), same as the `web` e2e run above.
+      - name: Run admin-web E2E tests
+        env:
+          HOST: "0.0.0.0"
+        run: pnpm --filter admin-web e2e

apps/admin-web/.env.example

@@ -0,0 +1,6 @@
+# Vite only exposes vars prefixed with VITE_ to client code.
+# Base URL of the API's /admin/* surface. Empty string = same origin as the
+# page (correct behind a shared reverse proxy). Native dev overrides it in
+# apps/admin-web/.env since the Vite dev server (5174) and the API (3000)
+# are different origins.
+VITE_ADMIN_API_URL=http://localhost:3000

apps/admin-web/Dockerfile

@@ -0,0 +1,25 @@
+# Its own image (not built into apps/api's) — the admin app is deployed
+# independently of the main app. Build stage compiles the Vite bundle from
+# the monorepo; runtime is a plain static nginx serving that bundle.
+#
+# Build context is the repo root (like apps/api/Dockerfile) — the workspace
+# packages (@batch-cooking/shared, @batch-cooking/date-tools) must resolve.
+FROM node:22-slim AS build
+RUN corepack enable
+WORKDIR /repo
+# Skip Cypress's Electron binary download — this image never runs it.
+ENV CYPRESS_INSTALL_BINARY=0
+COPY . .
+RUN pnpm install --frozen-lockfile
+# The admin bundle bakes in VITE_ADMIN_API_URL at build time. Default ""
+# (same-origin — correct behind a shared reverse proxy); override with
+# `--build-arg VITE_ADMIN_API_URL=https://api.example.com` when the admin
+# app is served from a different origin than the API.
+ARG VITE_ADMIN_API_URL=""
+ENV VITE_ADMIN_API_URL=$VITE_ADMIN_API_URL
+RUN pnpm --filter admin-web build
+
+FROM nginx:alpine AS runtime
+COPY apps/admin-web/nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /repo/apps/admin-web/dist /usr/share/nginx/html
+EXPOSE 80

apps/admin-web/cypress.config.ts

@@ -0,0 +1,28 @@
+import { addCucumberPreprocessorPlugin } from "@badeball/cypress-cucumber-preprocessor";
+import { createEsbuildPlugin } from "@badeball/cypress-cucumber-preprocessor/esbuild";
+import createBundler from "@bahmutov/cypress-esbuild-preprocessor";
+import { defineConfig } from "cypress";
+
+// Disable GPU for headless/sandboxed environments where no GPU device is
+// available — same helper as apps/web's cypress.config.ts.
+function disableGpu(on: Cypress.PluginEvents) {
+  on("before:browser:launch", (browser, launchOptions) => {
+    if (browser.family === "chromium") {
+      launchOptions.args.push("--disable-gpu", "--no-sandbox");
+    }
+    return launchOptions;
+  });
+}
+
+export default defineConfig({
+  e2e: {
+    baseUrl: "http://localhost:5174",
+    specPattern: ["cypress/e2e/**/*.cy.ts", "cypress/e2e/**/*.feature"],
+    async setupNodeEvents(on, config) {
+      disableGpu(on);
+      await addCucumberPreprocessorPlugin(on, config);
+      on("file:preprocessor", createBundler({ plugins: [createEsbuildPlugin(config)] }));
+      return config;
+    },
+  },
+});

apps/admin-web/cypress/e2e/admin-layout.cy.ts

@@ -0,0 +1,57 @@
+// Mocks the admin API via cy.intercept — no live backend (apps/api's Mocha
+// suite covers real /admin/* behaviour).
+
+const adminBody = {
+  id: 1,
+  email: "ops@example.com",
+  name: "Ops",
+  createdAt: "2026-08-01T00:00:00.000Z",
+  lastLoginAt: "2026-08-28T09:00:00.000Z",
+};
+
+describe("Admin layout", () => {
+  it("redirects to /login when there is no admin session", () => {
+    cy.intercept("GET", "**/admin/auth/me", {
+      statusCode: 401,
+      body: { code: 4011, message: "no" },
+    });
+    cy.visit("/monitoring");
+    cy.url().should("include", "/login");
+    cy.contains("h1", "Administration").should("be.visible");
+  });
+
+  it("shows the sidebar and navigates between the three sections", () => {
+    cy.intercept("GET", "**/admin/auth/me", { statusCode: 200, body: adminBody });
+    cy.visit("/");
+
+    cy.contains("h1", "Tableau de bord").should("be.visible");
+    cy.contains(".admin-sidebar__who", "Ops").should("be.visible");
+
+    cy.contains("nav a", "Monitoring").click();
+    cy.url().should("include", "/monitoring");
+    cy.contains("h1", "Monitoring").should("be.visible");
+    cy.contains("nav a", "Monitoring").should("have.class", "active");
+
+    cy.contains("nav a", "Corrections").click();
+    cy.url().should("include", "/corrections");
+    cy.contains("h1", "Corrections").should("be.visible");
+
+    cy.contains("nav a", "Tableau de bord").click();
+    cy.url().should("eq", `${Cypress.config().baseUrl}/`);
+  });
+
+  it("logs out back to /login", () => {
+    cy.intercept("GET", "**/admin/auth/me", { statusCode: 200, body: adminBody });
+    cy.intercept("POST", "**/admin/auth/logout", { statusCode: 204 });
+    cy.visit("/");
+
+    // Wait until the guarded layout has actually mounted before acting.
+    cy.contains("h1", "Tableau de bord").should("be.visible");
+
+    // Logout clears the in-memory admin state, which is what bounces the
+    // guard to /login — no fresh `me` round-trip involved, so nothing to
+    // re-stub here.
+    cy.contains("button", "Se déconnecter").click();
+    cy.url().should("include", "/login");
+  });
+});

apps/admin-web/cypress/e2e/dashboard.cy.ts

@@ -0,0 +1,95 @@
+// Mocks the admin API via cy.intercept — no live backend.
+
+const adminBody = {
+  id: 1,
+  email: "ops@example.com",
+  name: "Ops",
+  createdAt: "2026-08-01T00:00:00.000Z",
+  lastLoginAt: "2026-08-28T09:00:00.000Z",
+};
+
+/** A 3-day series helper for the fixture. */
+function series(counts: number[]) {
+  return counts.map((count, i) => ({
+    date: `2026-08-${String(10 + i).padStart(2, "0")}`,
+    count,
+  }));
+}
+
+function metricsFixture() {
+  return {
+    generatedAt: "2026-08-28T09:00:00.000Z",
+    rangeDays: 30,
+    snapshot: {
+      admins: 2,
+      users: 42,
+      households: 15,
+      activeHouseholds: 9,
+      recipes: 120,
+      recipesManual: 30,
+      recipesImported: 90,
+      recipesBySource: [
+        { key: "themealdb", label: "TheMealDB", count: 60 },
+        { key: "marmiton", label: "Marmiton", count: 30 },
+      ],
+      plannings: 18,
+      planningItems: 210,
+      steps: 640,
+      detectedTechniques: 900,
+      favorites: 55,
+      corrections: 12,
+      correctionsUnconsumed: 4,
+      correctionsRemoval: 2,
+      trainingSuggestions: 8,
+      trainingSuggestionsByStatus: [{ key: "pending", label: "pending", count: 8 }],
+      trainingSuggestionsBySourceType: [{ key: "correction", label: "correction", count: 8 }],
+    },
+    series: {
+      signups: series([1, 3, 2]),
+      recipesCreated: series([0, 2, 1]),
+      planningItemsAdded: series([4, 1, 5]),
+      correctionsSubmitted: series([0, 0, 1]),
+      trainingSuggestions: series([0, 1, 0]),
+    },
+    events: [{ type: "user.signup", buckets: series([1, 3, 2]) }],
+  };
+}
+
+describe("Admin dashboard", () => {
+  beforeEach(() => {
+    cy.viewport(1400, 900);
+    cy.intercept("GET", "**/admin/auth/me", { statusCode: 200, body: adminBody });
+  });
+
+  it("renders KPI tiles, a chart per series, and the breakdown lists", () => {
+    cy.intercept("GET", "**/admin/metrics*", { statusCode: 200, body: metricsFixture() }).as(
+      "getMetrics",
+    );
+    cy.visit("/");
+    cy.wait("@getMetrics").its("request.url").should("include", "days=30");
+
+    // KPI tiles — value + label.
+    cy.contains(".kpi-tile", "Utilisateurs").should("contain.text", "42");
+    cy.contains(".kpi-tile", "Recettes importées").should("contain.text", "90");
+    cy.contains(".kpi-tile", "Corrections à traiter").should("contain.text", "4");
+
+    // One chart card per instrumented series.
+    cy.get(".chart-card").should("have.length", 5);
+    cy.contains(".chart-card", "Inscriptions").should("contain.text", "6 sur 30 j");
+
+    // Breakdown lists.
+    cy.contains(".breakdown", "Recettes importées par source")
+      .should("contain.text", "TheMealDB")
+      .and("contain.text", "Marmiton");
+    cy.contains(".breakdown", "Évènements enregistrés").should("contain.text", "user.signup");
+  });
+
+  it("shows an error state when the metrics request fails", () => {
+    cy.intercept("GET", "**/admin/metrics*", {
+      statusCode: 500,
+      body: { code: 5000, message: "x" },
+    });
+    cy.visit("/");
+    cy.contains("Impossible de charger").should("be.visible");
+  });
+});

apps/admin-web/cypress/e2e/login.feature

@@ -0,0 +1,24 @@
+Feature: Admin login
+  As an operator
+  I want to sign in to the admin application
+  So that I can reach the metrics, monitoring and correction-triage sections
+
+  Scenario: A wrong password shows a translated error, no redirect
+    Given the admin session check returns unauthenticated
+    And admin login fails with invalid credentials
+    When I visit "/login"
+    And I fill in the "email" field with "ops@example.com"
+    And I fill in the "password" field with "wrong"
+    And I click the button "Se connecter"
+    Then I should see "Email ou mot de passe incorrect"
+    And the URL should include "/login"
+
+  Scenario: A correct login lands on the dashboard
+    Given the admin session check returns unauthenticated
+    And admin login succeeds as "Ops"
+    When I visit "/login"
+    And I fill in the "email" field with "ops@example.com"
+    And I fill in the "password" field with "correct-horse"
+    And I click the button "Se connecter"
+    Then the URL should not include "/login"
+    And I should see the heading "Tableau de bord"

apps/admin-web/cypress/e2e/login.ts

@@ -0,0 +1,24 @@
+import { Given } from "@badeball/cypress-cucumber-preprocessor";
+
+const adminBody = {
+  id: 1,
+  email: "ops@example.com",
+  name: "Ops",
+  createdAt: "2026-08-01T00:00:00.000Z",
+  lastLoginAt: "2026-08-28T09:00:00.000Z",
+};
+
+Given("admin login fails with invalid credentials", () => {
+  cy.intercept("POST", "**/admin/auth/login", {
+    statusCode: 401,
+    body: { code: 4010, message: "Invalid email or password" },
+  });
+});
+
+Given("admin login succeeds as {string}", (name: string) => {
+  const body = { ...adminBody, name, email: `${name.toLowerCase()}@example.com` };
+  cy.intercept("POST", "**/admin/auth/login", { statusCode: 200, body });
+  // After navigate("/"), RequireAdmin re-checks the session — from now on it
+  // must report authenticated (last matching intercept wins).
+  cy.intercept("GET", "**/admin/auth/me", { statusCode: 200, body });
+});

apps/admin-web/cypress/support/e2e.ts

@@ -0,0 +1,3 @@
+// Cypress support file — global config and custom commands go here as the
+// admin app grows. Same minimal starting point as apps/web's e2e.ts.
+export {};

apps/admin-web/cypress/support/step_definitions/common.steps.ts

@@ -0,0 +1,54 @@
+import { Given, Then, When } from "@badeball/cypress-cucumber-preprocessor";
+
+// Steps shared across admin feature specs — navigation and generic UI
+// assertions. Anything specific to one feature (its own API mocks, its own
+// DOM structure) lives in that feature's own `<name>.ts` step file.
+//
+// Every admin API call is mocked via `cy.intercept` — the Cypress suite
+// never runs a live backend; apps/api's own Mocha suite covers real
+// `/admin/*` behaviour.
+
+Given("the admin session check returns unauthenticated", () => {
+  cy.intercept("GET", "**/admin/auth/me", { statusCode: 401, body: { code: 4011, message: "no" } });
+});
+
+Given("I am signed in as admin {string}", (name: string) => {
+  cy.intercept("GET", "**/admin/auth/me", {
+    statusCode: 200,
+    body: {
+      id: 1,
+      email: `${name.toLowerCase()}@example.com`,
+      name,
+      createdAt: "2026-08-01T00:00:00.000Z",
+      lastLoginAt: "2026-08-28T09:00:00.000Z",
+    },
+  });
+});
+
+When("I visit {string}", (path: string) => {
+  cy.visit(path);
+});
+
+When("I fill in the {string} field with {string}", (fieldId: string, value: string) => {
+  cy.get(`#${fieldId}`).clear().type(value);
+});
+
+When("I click the button {string}", (text: string) => {
+  cy.contains("button", text).click();
+});
+
+Then("the URL should include {string}", (fragment: string) => {
+  cy.url().should("include", fragment);
+});
+
+Then("the URL should not include {string}", (fragment: string) => {
+  cy.url().should("not.include", fragment);
+});
+
+Then("I should see {string}", (text: string) => {
+  cy.contains(text).should("be.visible");
+});
+
+Then("I should see the heading {string}", (text: string) => {
+  cy.contains("h1", text).should("be.visible");
+});

apps/admin-web/index.html

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="fr">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>batchCooking — Admin</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

apps/admin-web/nginx.conf

@@ -0,0 +1,20 @@
+# Static host for the built admin SPA. Client-side routing (react-router)
+# means any unknown path must fall back to index.html rather than 404 —
+# same reason apps/api serves its own SPA that way.
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Long-cache the fingerprinted assets Vite emits; never cache the HTML
+    # entry point so a new deploy is picked up immediately.
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}

apps/admin-web/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "admin-web",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --host 0.0.0.0 --port 5174",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview --port 5174",
+    "test": "echo \"no unit tests yet\" && exit 0",
+    "cy:open": "cypress open",
+    "cy:run": "cypress run",
+    "e2e": "start-server-and-test dev http://localhost:5174 cy:run"
+  },
+  "dependencies": {
+    "@batch-cooking/date-tools": "workspace:*",
+    "@batch-cooking/shared": "workspace:*",
+    "i18next": "^26.3.6",
+    "lucide-react": "^1.32.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-i18next": "^17.0.11",
+    "react-router-dom": "^7.18.2",
+    "recharts": "^2.15.0",
+    "zod": "^3.25.76"
+  },
+  "devDependencies": {
+    "@badeball/cypress-cucumber-preprocessor": "22.2.0",
+    "@bahmutov/cypress-esbuild-preprocessor": "2.2.8",
+    "@cypress/vite-dev-server": "5.2.1",
+    "@types/node": "^22.9.0",
+    "@types/react": "^18.3.12",
+    "@types/react-dom": "^18.3.1",
+    "@vitejs/plugin-react": "^4.3.3",
+    "cypress": "13.17.0",
+    "esbuild": "0.21.5",
+    "sass": "^1.102.0",
+    "start-server-and-test": "^2.0.8",
+    "typescript": "^5.7.2",
+    "vite": "^5.4.11"
+  }
+}

apps/admin-web/src/App.tsx

@@ -0,0 +1,34 @@
+import { Navigate, Route, Routes } from "react-router-dom";
+import { RequireAdmin } from "./features/auth/RequireAdmin";
+import { AdminLayout } from "./layouts/AdminLayout";
+import { CorrectionsPage } from "./pages/corrections/CorrectionsPage";
+import { DashboardPage } from "./pages/dashboard/DashboardPage";
+import { LoginPage } from "./pages/login/LoginPage";
+import { MonitoringPage } from "./pages/monitoring/MonitoringPage";
+
+/**
+ * Admin app route table. `/login` is the only unauthenticated route;
+ * everything else is nested under one `RequireAdmin` + `AdminLayout` parent
+ * (the guard + sidebar chrome applied once), same shape as apps/web's
+ * `App.tsx`. Unknown paths fall back to `/`, which redirects to `/login`
+ * when there's no admin session.
+ */
+export function App() {
+  return (
+    <Routes>
+      <Route path="/login" element={<LoginPage />} />
+      <Route
+        element={
+          <RequireAdmin>
+            <AdminLayout />
+          </RequireAdmin>
+        }
+      >
+        <Route path="/" element={<DashboardPage />} />
+        <Route path="/monitoring" element={<MonitoringPage />} />
+        <Route path="/corrections" element={<CorrectionsPage />} />
+      </Route>
+      <Route path="*" element={<Navigate to="/" replace />} />
+    </Routes>
+  );
+}

apps/admin-web/src/api/client.ts

@@ -0,0 +1,102 @@
+import {
+  type AdminLoginInput,
+  type AdminUserView,
+  type ApiErrorResponse,
+  ErrorCode,
+  type MetricsView,
+} from "@batch-cooking/shared";
+
+/**
+ * Base URL of the admin API surface, configurable via `VITE_ADMIN_API_URL`
+ * (see `.env.example`). Defaults to `""` (same origin) — correct behind a
+ * shared reverse proxy; native dev overrides it to `http://localhost:3000`
+ * in `apps/admin-web/.env` since the Vite dev server (5174) and the API
+ * (3000) are different origins.
+ */
+const ADMIN_API_BASE_URL: string = import.meta.env.VITE_ADMIN_API_URL ?? "";
+
+/**
+ * Thrown by {@link AdminApiClient} on any non-2xx response — carries the
+ * same {@link ErrorCode} the API returned. Same shape as apps/web's
+ * `ApiError`; kept separate rather than shared so the two apps' transport
+ * layers stay independent.
+ */
+export class ApiError extends Error {
+  public readonly status: number;
+  public readonly code: ErrorCode;
+  public readonly fieldErrors?: Record<string, string[] | undefined>;
+
+  public constructor(status: number, body: ApiErrorResponse) {
+    super(body.message);
+    this.name = "ApiError";
+    this.status = status;
+    this.code = body.code;
+    this.fieldErrors = body.details;
+  }
+}
+
+/**
+ * Thin fetch wrapper around the `/admin/*` endpoints — same design as
+ * apps/web's `ApiClient` (a class for cohesion/extensibility, one shared
+ * stateless instance). Every request sends credentials so the
+ * `admin_session` httpOnly cookie round-trips.
+ */
+export class AdminApiClient {
+  /**
+   * Performs a JSON request against the admin API and returns the parsed body.
+   *
+   * @throws {ApiError} if the response status is not in the 2xx range.
+   */
+  private async _request<TResponseBody>(
+    path: string,
+    options: RequestInit = {},
+  ): Promise<TResponseBody> {
+    try {
+      const response = await fetch(`${ADMIN_API_BASE_URL}${path}`, {
+        ...options,
+        credentials: "include",
+        headers: { "Content-Type": "application/json", ...options.headers },
+      });
+
+      if (!response.ok) {
+        const body = (await response.json().catch(() => null)) as ApiErrorResponse | null;
+        throw new ApiError(
+          response.status,
+          body ?? { code: ErrorCode.INTERNAL_ERROR, message: "Something went wrong" },
+        );
+      }
+
+      if (response.status === 204) {
+        return undefined as TResponseBody;
+      }
+      return (await response.json()) as TResponseBody;
+    } catch (err) {
+      // Rethrown as-is — callers surface it their own way; this is just the
+      // one place the fetch/`await` sits in a try/catch per the repo's rule.
+      throw err;
+    }
+  }
+
+  /** Verifies admin credentials and starts an admin session. */
+  public login(input: AdminLoginInput): Promise<AdminUserView> {
+    return this._request("/admin/auth/login", { method: "POST", body: JSON.stringify(input) });
+  }
+
+  /** Ends the current admin session. */
+  public logout(): Promise<void> {
+    return this._request("/admin/auth/logout", { method: "POST" });
+  }
+
+  /** Fetches the currently authenticated admin — rejects with `NOT_AUTHENTICATED` if there's no session. */
+  public me(): Promise<AdminUserView> {
+    return this._request("/admin/auth/me");
+  }
+
+  /** Usage metrics for the dashboard — snapshot totals + `days` (7–365) of daily time series. */
+  public getMetrics(days: number): Promise<MetricsView> {
+    return this._request(`/admin/metrics?days=${days}`);
+  }
+}
+
+/** Single shared instance — stateless, same reasoning as apps/web's `apiClient`. */
+export const adminApiClient = new AdminApiClient();

apps/admin-web/src/features/auth/AdminAuthContext.tsx

@@ -0,0 +1,71 @@
+import type { AdminLoginInput, AdminUserView } from "@batch-cooking/shared";
+import { createContext, type ReactNode, useCallback, useContext, useEffect, useState } from "react";
+import { adminApiClient } from "../../api/client";
+
+/** Auth state/actions exposed via {@link useAdminAuth} — the admin-app counterpart of apps/web's `AuthContext`. */
+interface AdminAuthContextValue {
+  /** Currently authenticated admin, or `null` if no active session. */
+  admin: AdminUserView | null;
+  /** True only while the initial `GET /admin/auth/me` check is pending — lets `RequireAdmin` avoid a premature redirect. */
+  isLoading: boolean;
+  /** Verifies credentials and updates `admin` on success. Throws `ApiError` on failure. */
+  login: (input: AdminLoginInput) => Promise<void>;
+  /** Ends the session and clears `admin`. */
+  logout: () => Promise<void>;
+}
+
+const AdminAuthContext = createContext<AdminAuthContextValue | null>(null);
+
+/**
+ * Provides admin authentication state to the whole app. On mount, calls
+ * `GET /admin/auth/me` once to restore the session from the `admin_session`
+ * httpOnly cookie (if any) — same "reload keeps you logged in" behaviour as
+ * apps/web's `AuthProvider`.
+ */
+export function AdminAuthProvider({ children }: { children: ReactNode }) {
+  const [admin, setAdmin] = useState<AdminUserView | null>(null);
+  const [isLoading, setIsLoading] = useState(true);
+
+  useEffect(() => {
+    adminApiClient
+      .me()
+      .then(setAdmin)
+      // No/invalid session — the normal state for a first visit, not an error.
+      .catch(() => setAdmin(null))
+      .finally(() => setIsLoading(false));
+  }, []);
+
+  const login = useCallback(async (input: AdminLoginInput) => {
+    try {
+      setAdmin(await adminApiClient.login(input));
+    } catch (err) {
+      // Rethrown as-is — `LoginPage`'s submit handler catches and displays
+      // it; this callback just isn't allowed a bare `await`.
+      throw err;
+    }
+  }, []);
+
+  const logout = useCallback(async () => {
+    try {
+      await adminApiClient.logout();
+      setAdmin(null);
+    } catch (err) {
+      throw err; // see login()'s catch comment
+    }
+  }, []);
+
+  return (
+    <AdminAuthContext.Provider value={{ admin, isLoading, login, logout }}>
+      {children}
+    </AdminAuthContext.Provider>
+  );
+}
+
+/** Reads the current admin auth state/actions. Must be called within an {@link AdminAuthProvider}. */
+export function useAdminAuth(): AdminAuthContextValue {
+  const ctx = useContext(AdminAuthContext);
+  if (!ctx) {
+    throw new Error("useAdminAuth must be used within an AdminAuthProvider");
+  }
+  return ctx;
+}

apps/admin-web/src/features/auth/RequireAdmin.tsx

@@ -0,0 +1,21 @@
+import type { ReactNode } from "react";
+import { Navigate } from "react-router-dom";
+import { useAdminAuth } from "./AdminAuthContext";
+
+/**
+ * Route guard for every admin page. Renders nothing while the initial
+ * `GET /admin/auth/me` check is pending (avoids a flash-then-redirect);
+ * once resolved, renders `children` or redirects to `/login`. Mirror of
+ * apps/web's `RequireAuth`.
+ */
+export function RequireAdmin({ children }: { children: ReactNode }) {
+  const { admin, isLoading } = useAdminAuth();
+
+  if (isLoading) {
+    return null;
+  }
+  if (!admin) {
+    return <Navigate to="/login" replace />;
+  }
+  return <>{children}</>;
+}

apps/admin-web/src/features/auth/admin-auth.scss

@@ -0,0 +1,84 @@
+// =============================================================================
+// Admin login card — the only unauthenticated screen. A centered card on a
+// plain background, same language as apps/web's auth-form.scss (kept its own
+// copy rather than shared, the two apps' chrome is independent).
+// =============================================================================
+
+.admin-auth-page {
+  min-height: 100vh;
+  display: grid;
+  place-items: center;
+  padding: var(--space-lg);
+  background: var(--color-background);
+}
+
+.admin-auth-card {
+  width: 100%;
+  max-width: var(--max-width-form);
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+  padding: var(--space-xl);
+  background: var(--color-surface);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-md);
+
+  h1 {
+    font-size: var(--font-size-xl);
+    margin-bottom: var(--space-sm);
+  }
+
+  label {
+    font-size: var(--font-size-sm);
+    font-weight: 600;
+    color: var(--color-text-muted);
+  }
+
+  input {
+    padding: var(--space-sm);
+    font-size: var(--font-size-base);
+    font-family: var(--font-body);
+    border: 1.5px solid var(--color-border);
+    border-radius: var(--radius-base);
+    background: var(--color-surface);
+    color: var(--color-text);
+
+    &:focus-visible {
+      border-color: var(--color-primary);
+    }
+  }
+
+  button[type="submit"] {
+    margin-top: var(--space-sm);
+    padding: var(--space-sm) var(--space-md);
+    font-size: var(--font-size-base);
+    font-weight: 600;
+    font-family: var(--font-body);
+    color: var(--color-surface);
+    background: var(--color-primary);
+    border: none;
+    border-radius: var(--radius-base);
+    cursor: pointer;
+
+    &:hover {
+      background: var(--color-primary-hover);
+    }
+
+    &:disabled {
+      opacity: 0.6;
+      cursor: not-allowed;
+    }
+  }
+
+  .field-error {
+    margin: 0;
+    font-size: var(--font-size-xs);
+    color: var(--color-error);
+  }
+
+  .form-error {
+    margin: var(--space-xs) 0 0;
+    font-size: var(--font-size-sm);
+    color: var(--color-error);
+  }
+}

apps/admin-web/src/i18n/i18n.ts

@@ -0,0 +1,22 @@
+import i18next from "i18next";
+import { initReactI18next } from "react-i18next";
+import fr from "../locales/fr/translation.json";
+
+/**
+ * i18next instance for the admin app, imported once for its side effect
+ * (`main.tsx`) before anything renders. Only French exists today — same
+ * setup as apps/web's `i18n/i18n.ts`, its own separate locale file so the
+ * two apps' copy never has to be kept identical. `packages/shared`'s
+ * `ErrorCode` member names double as keys under the `errors` namespace
+ * (see `services/error-message.service.ts`).
+ */
+void i18next.use(initReactI18next).init({
+  resources: {
+    fr: { translation: fr },
+  },
+  lng: "fr",
+  fallbackLng: "fr",
+  interpolation: { escapeValue: false },
+});
+
+export default i18next;

apps/admin-web/src/layouts/AdminLayout.scss

@@ -0,0 +1,108 @@
+// =============================================================================
+// Admin app shell — a fixed left sidebar + scrollable main content area.
+// Simpler than apps/web's AppLayout (no collapsible rail, no nested submenu)
+// — an internal ops tool, three sections.
+// =============================================================================
+
+.admin-layout {
+  display: flex;
+  min-height: 100vh;
+}
+
+.admin-sidebar {
+  flex-shrink: 0;
+  width: 15rem;
+  display: flex;
+  flex-direction: column;
+  padding: var(--space-lg) var(--space-md);
+  background: var(--color-surface);
+  border-right: 1px solid var(--color-border);
+
+  &__brand {
+    font-family: var(--font-display);
+    font-weight: 700;
+    font-size: var(--font-size-lg);
+    color: var(--color-text);
+    margin-bottom: var(--space-lg);
+
+    span {
+      color: var(--color-accent);
+    }
+  }
+
+  &__nav {
+    display: flex;
+    flex-direction: column;
+    gap: 0.15rem;
+
+    a {
+      display: flex;
+      align-items: center;
+      gap: var(--space-sm);
+      padding: var(--space-sm);
+      border-radius: var(--radius-base);
+      color: var(--color-text-muted);
+      text-decoration: none;
+      font-size: var(--font-size-sm);
+      font-weight: 600;
+
+      &:hover {
+        background: var(--color-surface-alt);
+        color: var(--color-text);
+      }
+
+      &.active {
+        background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
+        color: var(--color-primary);
+      }
+    }
+  }
+
+  &__footer {
+    margin-top: auto;
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-xs);
+    padding-top: var(--space-md);
+    border-top: 1px solid var(--color-border);
+  }
+
+  &__who {
+    font-size: var(--font-size-sm);
+    font-weight: 600;
+    color: var(--color-text);
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+
+  &__footer button {
+    padding: var(--space-xs) var(--space-sm);
+    font-size: var(--font-size-sm);
+    font-family: var(--font-body);
+    color: var(--color-text-muted);
+    background: none;
+    border: 1px solid var(--color-border);
+    border-radius: var(--radius-base);
+    cursor: pointer;
+    text-align: left;
+
+    &:hover {
+      color: var(--color-text);
+      border-color: var(--color-primary);
+    }
+  }
+
+  &__version {
+    margin: 0;
+    font-size: var(--font-size-xs);
+    color: var(--color-text-muted);
+  }
+}
+
+.admin-content {
+  flex: 1;
+  min-width: 0;
+  padding: var(--space-xl);
+  overflow: auto;
+}

apps/admin-web/src/layouts/AdminLayout.tsx

@@ -0,0 +1,83 @@
+import { Activity, LayoutDashboard, ListChecks } from "lucide-react";
+import { useState } from "react";
+import { useTranslation } from "react-i18next";
+import { NavLink, Outlet, useNavigate } from "react-router-dom";
+import { useAdminAuth } from "../features/auth/AdminAuthContext";
+import "./AdminLayout.scss";
+
+/**
+ * One entry in the admin sidebar's nav. `key` maps to `admin.nav.<key>` in
+ * the locale file — adding a section is one array entry plus one locale key.
+ */
+const NAV_ITEMS = [
+  { to: "/", key: "dashboard", Icon: LayoutDashboard, end: true },
+  { to: "/monitoring", key: "monitoring", Icon: Activity, end: false },
+  { to: "/corrections", key: "corrections", Icon: ListChecks, end: false },
+] as const;
+
+/**
+ * Shell for every authenticated admin page: a fixed sidebar (brand, section
+ * nav, the signed-in admin's name + logout) plus a main area rendering the
+ * matched child route via `<Outlet />`. Mounted once as the parent of the
+ * whole `RequireAdmin`-guarded route group (see `App.tsx`), so `admin` is
+ * guaranteed non-null here.
+ */
+export function AdminLayout() {
+  const { t } = useTranslation();
+  const { admin, logout } = useAdminAuth();
+  const navigate = useNavigate();
+  const [isLoggingOut, setIsLoggingOut] = useState(false);
+
+  async function handleLogout() {
+    setIsLoggingOut(true);
+    try {
+      await logout();
+      void navigate("/login");
+    } catch {
+      // Even if the network call failed, the local session state was
+      // cleared optimistically enough for the guard to bounce to /login;
+      // nothing useful to show the operator here.
+      void navigate("/login");
+    }
+  }
+
+  return (
+    <div className="admin-layout">
+      <aside className="admin-sidebar">
+        <div className="admin-sidebar__brand">
+          batchCooking <span>Admin</span>
+        </div>
+
+        <nav className="admin-sidebar__nav">
+          {NAV_ITEMS.map(({ to, key, Icon, end }) => (
+            <NavLink
+              key={to}
+              to={to}
+              end={end}
+              className={({ isActive }) => (isActive ? "active" : undefined)}
+            >
+              <Icon size={18} aria-hidden="true" />
+              <span>{t(`admin.nav.${key}`)}</span>
+            </NavLink>
+          ))}
+        </nav>
+
+        <div className="admin-sidebar__footer">
+          <span className="admin-sidebar__who" title={admin?.email}>
+            {admin?.name}
+          </span>
+          <button type="button" onClick={handleLogout} disabled={isLoggingOut}>
+            {t("admin.layout.logout")}
+          </button>
+          <p className="admin-sidebar__version" aria-hidden="true">
+            v{__APP_VERSION__}
+          </p>
+        </div>
+      </aside>
+
+      <main className="admin-content">
+        <Outlet />
+      </main>
+    </div>
+  );
+}

apps/admin-web/src/lib/zod-errors.ts

@@ -0,0 +1,18 @@
+import type { ZodError } from "zod";
+
+/**
+ * Flattens a zod validation error into `{ fieldName: firstMessage }` for
+ * inline display under each form field — verbatim copy of apps/web's
+ * `lib/zod-errors.ts` (only the first message per field, enough for the
+ * single-rule-per-field schemas used here).
+ */
+export function fieldErrorsFrom(error: ZodError): Record<string, string> {
+  const fieldErrors = error.flatten().fieldErrors;
+  const firstMessagePerField: Record<string, string> = {};
+  for (const [field, messages] of Object.entries(fieldErrors)) {
+    if (messages?.[0]) {
+      firstMessagePerField[field] = messages[0];
+    }
+  }
+  return firstMessagePerField;
+}

apps/admin-web/src/locales/fr/translation.json

@@ -0,0 +1,69 @@
+{
+  "errors": {
+    "VALIDATION_ERROR": "Erreur de validation",
+    "INVALID_CREDENTIALS": "Email ou mot de passe incorrect",
+    "NOT_AUTHENTICATED": "Vous devez être connecté",
+    "NOT_FOUND": "Ressource introuvable",
+    "TECH_STEP_NOT_FOUND": "Cette technique n'existe pas",
+    "INTERNAL_ERROR": "Une erreur est survenue, réessayez plus tard"
+  },
+  "admin": {
+    "common": {
+      "comingSoon": "Section à venir.",
+      "loading": "Chargement…",
+      "loadError": "Impossible de charger les données, réessayez plus tard."
+    },
+    "login": {
+      "title": "Administration",
+      "emailLabel": "Email",
+      "passwordLabel": "Mot de passe",
+      "submit": "Se connecter",
+      "submitting": "Connexion…"
+    },
+    "nav": {
+      "dashboard": "Tableau de bord",
+      "monitoring": "Monitoring",
+      "corrections": "Corrections"
+    },
+    "layout": {
+      "logout": "Se déconnecter"
+    },
+    "dashboard": {
+      "title": "Tableau de bord",
+      "lead": "Métriques d'utilisation de l'application.",
+      "windowTotal": "{{n}} sur 30 j",
+      "recipesBySource": "Recettes importées par source",
+      "noImports": "Aucune recette importée.",
+      "events": "Évènements enregistrés (30 j)",
+      "kpi": {
+        "users": "Utilisateurs",
+        "households": "Foyers",
+        "activeHouseholds": "Foyers actifs",
+        "recipes": "Recettes",
+        "recipesImported": "Recettes importées",
+        "plannings": "Plannings",
+        "planningItems": "Créneaux planifiés",
+        "favorites": "Favoris",
+        "corrections": "Corrections",
+        "correctionsUnconsumed": "Corrections à traiter",
+        "trainingSuggestions": "Suggestions d'entraînement",
+        "admins": "Administrateurs"
+      },
+      "series": {
+        "signups": "Inscriptions",
+        "recipesCreated": "Recettes créées",
+        "planningItemsAdded": "Ajouts au planning",
+        "correctionsSubmitted": "Corrections soumises",
+        "trainingSuggestions": "Suggestions générées"
+      }
+    },
+    "monitoring": {
+      "title": "Monitoring",
+      "lead": "Santé des microservices et de la base de données."
+    },
+    "corrections": {
+      "title": "Corrections",
+      "lead": "Tri des corrections utilisateur pour le ré-entraînement NLP."
+    }
+  }
+}

apps/admin-web/src/main.tsx

@@ -0,0 +1,24 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { BrowserRouter } from "react-router-dom";
+import { App } from "./App";
+import { AdminAuthProvider } from "./features/auth/AdminAuthContext";
+// Side-effect import: initializes i18next before anything renders.
+import "./i18n/i18n";
+// Global stylesheet (theme tokens + minimal reset) — the only non-colocated .scss import.
+import "./styles/global.scss";
+
+const rootElement = document.getElementById("root");
+if (!rootElement) {
+  throw new Error("Root element not found");
+}
+
+createRoot(rootElement).render(
+  <StrictMode>
+    <BrowserRouter>
+      <AdminAuthProvider>
+        <App />
+      </AdminAuthProvider>
+    </BrowserRouter>
+  </StrictMode>,
+);

apps/admin-web/src/pages/admin-page.scss

@@ -0,0 +1,26 @@
+// =============================================================================
+// Shared chrome for every routed admin page — a page title and an optional
+// lead paragraph. Individual pages add their own colocated .scss for their
+// specific content (charts, tables, status board) on top.
+// =============================================================================
+
+.admin-page {
+  &__title {
+    font-size: var(--font-size-2xl);
+    margin-bottom: var(--space-xs);
+  }
+
+  &__lead {
+    margin: 0 0 var(--space-lg);
+    color: var(--color-text-muted);
+    font-size: var(--font-size-md);
+  }
+
+  &__placeholder {
+    padding: var(--space-xl);
+    border: 1px dashed var(--color-border);
+    border-radius: var(--radius-md);
+    color: var(--color-text-muted);
+    text-align: center;
+  }
+}

apps/admin-web/src/pages/corrections/CorrectionsPage.tsx

@@ -0,0 +1,19 @@
+import { useTranslation } from "react-i18next";
+import "../admin-page.scss";
+
+/**
+ * Tech-step correction triage — review `TechStepTrainingSuggestion` /
+ * `StepTechStepCorrection`, mark applied/rejected, generate the
+ * `training_data.py` snippet, and trigger the F1 gate + backfill. Placeholder
+ * until PR 5 (correction triage + retrain).
+ */
+export function CorrectionsPage() {
+  const { t } = useTranslation();
+  return (
+    <div className="admin-page">
+      <h1 className="admin-page__title">{t("admin.corrections.title")}</h1>
+      <p className="admin-page__lead">{t("admin.corrections.lead")}</p>
+      <p className="admin-page__placeholder">{t("admin.common.comingSoon")}</p>
+    </div>
+  );
+}

apps/admin-web/src/pages/dashboard/DashboardPage.tsx

@@ -0,0 +1,175 @@
+import type { MetricsTimeBucket, MetricsView } from "@batch-cooking/shared";
+import { useEffect, useState } from "react";
+import { useTranslation } from "react-i18next";
+import {
+  CartesianGrid,
+  Line,
+  LineChart,
+  ResponsiveContainer,
+  Tooltip,
+  XAxis,
+  YAxis,
+} from "recharts";
+import { adminApiClient } from "../../api/client";
+import "../admin-page.scss";
+import "./dashboard-page.scss";
+import { formatCount, kpiTiles, seriesTotal, shortDay } from "./dashboard";
+
+/** Load state for `GET /admin/metrics` — same discriminated-union shape as apps/web's page states. */
+type DashboardState =
+  | { status: "loading" }
+  | { status: "loaded"; metrics: MetricsView }
+  | { status: "error" };
+
+const RANGE_DAYS = 30;
+
+/**
+ * Usage-metrics dashboard. KPI tiles from the snapshot, then a small line
+ * chart per instrumented time series over the last {@link RANGE_DAYS} days.
+ * Fed by `GET /admin/metrics`; read-only, refetched only on mount.
+ */
+export function DashboardPage() {
+  const { t } = useTranslation();
+  const [state, setState] = useState<DashboardState>({ status: "loading" });
+
+  useEffect(() => {
+    let cancelled = false;
+    setState({ status: "loading" });
+    adminApiClient
+      .getMetrics(RANGE_DAYS)
+      .then((metrics) => {
+        if (!cancelled) setState({ status: "loaded", metrics });
+      })
+      .catch(() => {
+        if (!cancelled) setState({ status: "error" });
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  return (
+    <div className="admin-page">
+      <h1 className="admin-page__title">{t("admin.dashboard.title")}</h1>
+      <p className="admin-page__lead">{t("admin.dashboard.lead")}</p>
+
+      {state.status === "loading" && (
+        <p className="admin-page__placeholder">{t("admin.common.loading")}</p>
+      )}
+      {state.status === "error" && (
+        <p className="admin-page__placeholder">{t("admin.common.loadError")}</p>
+      )}
+      {state.status === "loaded" && <DashboardBody metrics={state.metrics} />}
+    </div>
+  );
+}
+
+function DashboardBody({ metrics }: { metrics: MetricsView }) {
+  const { t } = useTranslation();
+  const { snapshot, series } = metrics;
+
+  const charts: { key: string; buckets: MetricsTimeBucket[] }[] = [
+    { key: "signups", buckets: series.signups },
+    { key: "recipesCreated", buckets: series.recipesCreated },
+    { key: "planningItemsAdded", buckets: series.planningItemsAdded },
+    { key: "correctionsSubmitted", buckets: series.correctionsSubmitted },
+    { key: "trainingSuggestions", buckets: series.trainingSuggestions },
+  ];
+
+  return (
+    <>
+      <section className="kpi-grid">
+        {kpiTiles(snapshot).map((tile) => (
+          <div className="kpi-tile" key={tile.labelKey}>
+            <span className="kpi-tile__value">{formatCount(tile.value)}</span>
+            <span className="kpi-tile__label">{t(`admin.dashboard.kpi.${tile.labelKey}`)}</span>
+          </div>
+        ))}
+      </section>
+
+      <section className="chart-grid">
+        {charts.map(({ key, buckets }) => (
+          <article className="chart-card" key={key}>
+            <header className="chart-card__head">
+              <h2>{t(`admin.dashboard.series.${key}`)}</h2>
+              <span className="chart-card__total">
+                {t("admin.dashboard.windowTotal", { n: seriesTotal(buckets) })}
+              </span>
+            </header>
+            <TrendChart buckets={buckets} />
+          </article>
+        ))}
+      </section>
+
+      <section className="breakdown">
+        <h2>{t("admin.dashboard.recipesBySource")}</h2>
+        {snapshot.recipesBySource.length === 0 ? (
+          <p className="admin-page__placeholder">{t("admin.dashboard.noImports")}</p>
+        ) : (
+          <ul className="breakdown__list">
+            {snapshot.recipesBySource.map((row) => (
+              <li key={row.key}>
+                <span>{row.label}</span>
+                <span>{formatCount(row.count)}</span>
+              </li>
+            ))}
+          </ul>
+        )}
+      </section>
+
+      {metrics.events.length > 0 && (
+        <section className="breakdown">
+          <h2>{t("admin.dashboard.events")}</h2>
+          <ul className="breakdown__list">
+            {metrics.events.map((event) => (
+              <li key={event.type}>
+                <span>{event.type}</span>
+                <span>{formatCount(seriesTotal(event.buckets))}</span>
+              </li>
+            ))}
+          </ul>
+        </section>
+      )}
+    </>
+  );
+}
+
+/** A compact 30-day line chart for one metrics series. */
+function TrendChart({ buckets }: { buckets: MetricsTimeBucket[] }) {
+  const data = buckets.map((bucket) => ({ day: shortDay(bucket.date), count: bucket.count }));
+  return (
+    <div className="chart-card__body">
+      <ResponsiveContainer width="100%" height={160}>
+        <LineChart data={data} margin={{ top: 4, right: 8, bottom: 0, left: -20 }}>
+          <CartesianGrid strokeDasharray="3 3" stroke="var(--color-border)" />
+          <XAxis
+            dataKey="day"
+            tick={{ fontSize: 10, fill: "var(--color-text-muted)" }}
+            interval="preserveStartEnd"
+            minTickGap={24}
+          />
+          <YAxis
+            allowDecimals={false}
+            width={40}
+            tick={{ fontSize: 10, fill: "var(--color-text-muted)" }}
+          />
+          <Tooltip
+            contentStyle={{
+              background: "var(--color-surface)",
+              border: "1px solid var(--color-border)",
+              borderRadius: 8,
+              fontSize: 12,
+            }}
+          />
+          <Line
+            type="monotone"
+            dataKey="count"
+            stroke="var(--color-primary)"
+            strokeWidth={2}
+            dot={false}
+          />
+        </LineChart>
+      </ResponsiveContainer>
+    </div>
+  );
+}

apps/admin-web/src/pages/dashboard/dashboard-page.scss

@@ -0,0 +1,103 @@
+// =============================================================================
+// DashboardPage — KPI tile grid + a grid of small trend charts + a couple of
+// breakdown lists. Colocated with DashboardPage.tsx.
+// =============================================================================
+
+.kpi-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(9rem, 1fr));
+  gap: var(--space-sm);
+  margin-bottom: var(--space-xl);
+}
+
+.kpi-tile {
+  display: flex;
+  flex-direction: column;
+  gap: 0.15rem;
+  padding: var(--space-md);
+  background: var(--color-surface);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+
+  &__value {
+    font-family: var(--font-display);
+    font-size: var(--font-size-xl);
+    font-weight: 700;
+    color: var(--color-text);
+    font-variant-numeric: tabular-nums;
+  }
+
+  &__label {
+    font-size: var(--font-size-xs);
+    color: var(--color-text-muted);
+  }
+}
+
+.chart-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
+  gap: var(--space-md);
+  margin-bottom: var(--space-xl);
+}
+
+.chart-card {
+  padding: var(--space-md);
+  background: var(--color-surface);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+
+  &__head {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    gap: var(--space-sm);
+    margin-bottom: var(--space-sm);
+
+    h2 {
+      font-size: var(--font-size-md);
+    }
+  }
+
+  &__total {
+    font-size: var(--font-size-sm);
+    color: var(--color-text-muted);
+    font-variant-numeric: tabular-nums;
+  }
+}
+
+.breakdown {
+  margin-bottom: var(--space-lg);
+
+  h2 {
+    font-size: var(--font-size-md);
+    margin-bottom: var(--space-sm);
+  }
+
+  &__list {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+    background: var(--color-surface);
+    border: 1px solid var(--color-border);
+    border-radius: var(--radius-md);
+    max-width: 30rem;
+
+    li {
+      display: flex;
+      justify-content: space-between;
+      gap: var(--space-md);
+      padding: var(--space-sm) var(--space-md);
+      border-bottom: 1px solid var(--color-border);
+      font-size: var(--font-size-sm);
+
+      &:last-child {
+        border-bottom: none;
+      }
+
+      span:last-child {
+        font-variant-numeric: tabular-nums;
+        color: var(--color-text-muted);
+      }
+    }
+  }
+}

apps/admin-web/src/pages/dashboard/dashboard.ts

@@ -0,0 +1,51 @@
+import type { MetricsSnapshotView, MetricsTimeBucket } from "@batch-cooking/shared";
+
+/**
+ * Pure helpers for `DashboardPage` — number/date formatting and the tile
+ * list, kept out of the `.tsx` (repo convention: no derivation logic in a
+ * component file) so they're trivially testable.
+ */
+
+/** French-grouped integer, e.g. `1234` → `"1 234"`. */
+export function formatCount(value: number): string {
+  return value.toLocaleString("fr-FR");
+}
+
+/** `"2026-08-28"` → `"28/08"` for a compact chart axis tick. */
+export function shortDay(isoDate: string): string {
+  const [, month, day] = isoDate.split("-");
+  return `${day}/${month}`;
+}
+
+/** Sum of a time series — the "total over the window" figure shown next to each chart. */
+export function seriesTotal(buckets: MetricsTimeBucket[]): number {
+  return buckets.reduce((sum, bucket) => sum + bucket.count, 0);
+}
+
+/** One KPI tile: an i18n label key and the snapshot value it reads. */
+export interface KpiTile {
+  labelKey: string;
+  value: number;
+}
+
+/**
+ * The dashboard's KPI tiles, in display order. `labelKey` resolves under
+ * `admin.dashboard.kpi.*`. Kept here (not inline in JSX) so the set is one
+ * list to reorder/extend.
+ */
+export function kpiTiles(snapshot: MetricsSnapshotView): KpiTile[] {
+  return [
+    { labelKey: "users", value: snapshot.users },
+    { labelKey: "households", value: snapshot.households },
+    { labelKey: "activeHouseholds", value: snapshot.activeHouseholds },
+    { labelKey: "recipes", value: snapshot.recipes },
+    { labelKey: "recipesImported", value: snapshot.recipesImported },
+    { labelKey: "plannings", value: snapshot.plannings },
+    { labelKey: "planningItems", value: snapshot.planningItems },
+    { labelKey: "favorites", value: snapshot.favorites },
+    { labelKey: "corrections", value: snapshot.corrections },
+    { labelKey: "correctionsUnconsumed", value: snapshot.correctionsUnconsumed },
+    { labelKey: "trainingSuggestions", value: snapshot.trainingSuggestions },
+    { labelKey: "admins", value: snapshot.admins },
+  ];
+}

apps/admin-web/src/pages/login/LoginPage.tsx

@@ -0,0 +1,85 @@
+import { adminLoginSchema, ErrorCode } from "@batch-cooking/shared";
+import { type FormEvent, useState } from "react";
+import { useTranslation } from "react-i18next";
+import { useNavigate } from "react-router-dom";
+import { ApiError } from "../../api/client";
+import { useAdminAuth } from "../../features/auth/AdminAuthContext";
+import "../../features/auth/admin-auth.scss";
+import { fieldErrorsFrom } from "../../lib/zod-errors";
+import { errorMessageService } from "../../services/error-message.service";
+
+/**
+ * The admin login screen — the only unauthenticated route. Client-side
+ * validation via the shared `adminLoginSchema` (same rules the API
+ * enforces), then `POST /admin/auth/login`; any API failure is translated
+ * to a localized label via {@link ErrorMessageService}. Same structure as
+ * apps/web's `LoginPage`.
+ */
+export function LoginPage() {
+  const { login } = useAdminAuth();
+  const navigate = useNavigate();
+  const { t } = useTranslation();
+
+  const [email, setEmail] = useState("");
+  const [password, setPassword] = useState("");
+  const [fieldErrors, setFieldErrors] = useState<Record<string, string>>({});
+  const [formError, setFormError] = useState<string | null>(null);
+  const [isSubmitting, setIsSubmitting] = useState(false);
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault();
+    setFormError(null);
+
+    const result = adminLoginSchema.safeParse({ email, password });
+    if (!result.success) {
+      setFieldErrors(fieldErrorsFrom(result.error));
+      return;
+    }
+    setFieldErrors({});
+
+    setIsSubmitting(true);
+    try {
+      await login(result.data);
+      void navigate("/");
+    } catch (err) {
+      const code = err instanceof ApiError ? err.code : ErrorCode.INTERNAL_ERROR;
+      setFormError(errorMessageService.getLabel(code));
+    } finally {
+      setIsSubmitting(false);
+    }
+  }
+
+  return (
+    <main className="admin-auth-page">
+      <form className="admin-auth-card" onSubmit={handleSubmit} noValidate>
+        <h1>{t("admin.login.title")}</h1>
+
+        <label htmlFor="email">{t("admin.login.emailLabel")}</label>
+        <input
+          id="email"
+          type="email"
+          value={email}
+          onChange={(e) => setEmail(e.target.value)}
+          autoComplete="email"
+        />
+        {fieldErrors.email && <p className="field-error">{fieldErrors.email}</p>}
+
+        <label htmlFor="password">{t("admin.login.passwordLabel")}</label>
+        <input
+          id="password"
+          type="password"
+          value={password}
+          onChange={(e) => setPassword(e.target.value)}
+          autoComplete="current-password"
+        />
+        {fieldErrors.password && <p className="field-error">{fieldErrors.password}</p>}
+
+        {formError && <p className="form-error">{formError}</p>}
+
+        <button type="submit" disabled={isSubmitting}>
+          {isSubmitting ? t("admin.login.submitting") : t("admin.login.submit")}
+        </button>
+      </form>
+    </main>
+  );
+}

apps/admin-web/src/pages/monitoring/MonitoringPage.tsx

@@ -0,0 +1,18 @@
+import { useTranslation } from "react-i18next";
+import "../admin-page.scss";
+
+/**
+ * Microservice health board — active probes of Postgres, the API, the
+ * intent-service and the LLM worker's heartbeat, fed by
+ * `GET /admin/monitoring`. Placeholder until PR 4 (monitoring).
+ */
+export function MonitoringPage() {
+  const { t } = useTranslation();
+  return (
+    <div className="admin-page">
+      <h1 className="admin-page__title">{t("admin.monitoring.title")}</h1>
+      <p className="admin-page__lead">{t("admin.monitoring.lead")}</p>
+      <p className="admin-page__placeholder">{t("admin.common.comingSoon")}</p>
+    </div>
+  );
+}

apps/admin-web/src/services/error-message.service.ts

@@ -0,0 +1,19 @@
+import { ErrorCode } from "@batch-cooking/shared";
+import i18n from "../i18n/i18n";
+
+/**
+ * Localized label for an {@link ErrorCode} returned by the admin API —
+ * verbatim behaviour of apps/web's `ErrorMessageService`: reverse-maps the
+ * numeric enum value to its member name (`4010` → `"INVALID_CREDENTIALS"`)
+ * and looks it up under the `errors` namespace, falling back to
+ * `INTERNAL_ERROR` for a code this client doesn't recognise.
+ */
+export class ErrorMessageService {
+  public getLabel(code: ErrorCode): string {
+    const memberName = ErrorCode[code] ?? ErrorCode[ErrorCode.INTERNAL_ERROR];
+    return i18n.t(`errors.${memberName}`);
+  }
+}
+
+/** Single shared instance — stateless. */
+export const errorMessageService = new ErrorMessageService();

apps/admin-web/src/styles/_theme.scss

@@ -0,0 +1,171 @@
+// NOTE: verbatim copy of apps/web/src/styles/_theme.scss. Extracting these
+// tokens into a shared package (consumed by both apps) is tracked separately
+// — keep the two files in sync by hand until then.
+// =============================================================================
+// Design tokens — the single source of truth for colors, spacing, typography
+// and other reusable values across the whole app.
+//
+// Exposed as CSS custom properties on :root (not plain SCSS variables) so
+// they're available at *runtime*, not just compile time — this is what lets
+// dark mode work below by simply redefining these variables instead of
+// rebuilding the stylesheet. Every other .scss file should reference
+// `var(--token-name)`, never a hardcoded color/size.
+//
+// Palette name: "Mise en Place" — a kitchen-operations identity (batch
+// cooking as logistics: everything labeled and in its place before you
+// start) rather than a food-blog one. See the design proposal for the full
+// rationale: https://claude.ai/code/artifact/1db63af0-cfd1-4f77-9369-71ca6accd06f
+//
+// Import this partial once, globally (see global.scss) — never re-import it
+// from a component-level .scss file, `:root` only needs to be declared once.
+// =============================================================================
+
+:root {
+  // --- Surfaces & ink ---------------------------------------------------
+  // Neutral surface: page background ("porcelaine") vs. the card surface
+  // content sits on, plus a recessed variant for panels/table headers.
+  --color-background: #eef2ed;
+  --color-surface: #ffffff;
+  --color-surface-alt: #e2e8e0;
+  // Text.
+  --color-text: #1f2a22;
+  --color-text-muted: #57685a;
+  --color-border: #c7d0c4;
+
+  // --- Brand accents, each with one job --------------------------------
+  // Basil — primary actions, links, brand presence.
+  --color-primary: #2e6b4a;
+  --color-primary-hover: #244f38;
+  // Vermillion — secondary accent for urgency/strong calls to action
+  // (e.g. a timer, "start session"). Never reused for allergen alerts
+  // below — those need their own, unambiguous color.
+  --color-accent: #cc4b26;
+  --color-accent-hover: #a83c1c;
+  // Turmeric — category/classification tags.
+  --color-tag: #c98a1b;
+  --color-tag-ink: #3a2c05; // pairs with a solid --color-tag fill only.
+
+  // --- Feedback -----------------------------------------------------------
+  --color-success: #2e6b4a;
+  --color-warning: #c98a1b;
+  --color-error: #b3271e;
+
+  // --- Allergens / intolerances --------------------------------------------
+  // A 3-tier food-safety scale, kept distinct from --color-error so an
+  // allergen warning is never confused with a form validation error:
+  //   - critical (declared allergen): its own color, solid/inverted fill
+  //   - moderate (intolerance): reuses --color-warning, tinted fill
+  //   - trace ("may contain traces of…"): neutral, dashed outline
+  // The severity is carried by the FILL TREATMENT, not the hue alone, so
+  // it stays legible for color-blind users. See the design proposal's
+  // "Alertes & allergènes" section for the full component set.
+  --color-allergen: #a8123f;
+  --color-allergen-ink: #ffe9ef; // pairs with a solid --color-allergen fill only.
+
+  // --- Spacing scale ---------------------------------------------------------
+  // Multiples of a 4px base unit — use these instead of ad hoc px values so
+  // spacing stays visually consistent as the app grows.
+  --space-xs: 0.25rem; // 4px
+  --space-sm: 0.5rem; // 8px
+  --space-md: 1rem; // 16px
+  --space-lg: 1.5rem; // 24px
+  --space-xl: 2rem; // 32px
+  --space-2xl: 3rem; // 48px — inter-section spacing
+
+  // --- Typography --------------------------------------------------------
+  // System font stacks only — no remote webfont, so there's zero loading
+  // latency and no flash of unstyled text, which fits an app meant to be
+  // used quickly under time pressure. Three roles: a condensed "label"
+  // face for headings/eyebrows, a humanist face for body copy, and a
+  // monospace for anything that lines up in columns (times, quantities).
+  --font-display: "Bahnschrift", "Arial Narrow", "Segoe UI", sans-serif;
+  --font-body: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
+  --font-mono: "Cascadia Mono", Consolas, "SF Mono", "Liberation Mono", monospace;
+
+  --font-size-xs: 0.75rem; // 12px — captions, meta
+  --font-size-sm: 0.875rem; // 14px — labels, secondary text
+  --font-size-base: 1rem; // 16px — body
+  --font-size-md: 1.125rem; // 18px — lead paragraph
+  --font-size-lg: 1.375rem; // 22px — H3 / card titles
+  --font-size-xl: 1.75rem; // 28px — H2 / section titles
+  --font-size-2xl: 2.25rem; // 36px — H1 / page titles
+  --font-size-3xl: 3rem; // 48px — display, exceptional use only
+
+  // --- Shape / elevation --------------------------------------------------
+  --radius-base: 4px; // controls (inputs, buttons) — deliberately flat
+  --radius-md: 10px; // cards
+  --radius-lg: 18px; // panels, modals
+  --radius-pill: 999px; // tags, badges
+  --max-width-form: 22rem;
+
+  --shadow-sm: 0 1px 2px rgba(31, 42, 34, 0.08), 0 1px 1px rgba(31, 42, 34, 0.06);
+  --shadow-md: 0 6px 16px rgba(31, 42, 34, 0.12), 0 2px 6px rgba(31, 42, 34, 0.08);
+}
+
+// Lets the browser pick sensible default colors (form controls, scrollbars)
+// for whichever mode the user ends up in.
+:root {
+  color-scheme: light dark;
+}
+
+// --- Dark mode ---------------------------------------------------------
+// Follows the OS/browser preference by default. Guarded with
+// `:root:not([data-theme="light"])` so an explicit "light" choice (see
+// apps/web's `ThemeContext`, `SYSTEM` = no `data-theme` attribute at all —
+// this block then decides) can override a dark OS setting.
+@media (prefers-color-scheme: dark) {
+  :root:not([data-theme="light"]) {
+    --color-background: #14181a;
+    --color-surface: #1c221e;
+    --color-surface-alt: #262e27;
+    --color-text: #edf1ea;
+    --color-text-muted: #a9b5a6;
+    --color-border: #384038;
+
+    --color-primary: #5fae7e;
+    --color-primary-hover: #7cc496;
+    --color-accent: #ea7a48;
+    --color-accent-hover: #f0946c;
+    --color-tag: #e8b84b;
+    --color-tag-ink: #2a2005;
+
+    --color-success: #5fae7e;
+    --color-warning: #e8b84b;
+    --color-error: #e5675a;
+
+    --color-allergen: #e2547b;
+    --color-allergen-ink: #3a0416;
+
+    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
+    --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.45);
+  }
+}
+
+// Mirrors the block above for an explicit "dark" choice (`ThemeContext`
+// sets `data-theme="dark"` on `<html>`), so it wins over the OS setting in
+// both directions.
+:root[data-theme="dark"] {
+  --color-background: #14181a;
+  --color-surface: #1c221e;
+  --color-surface-alt: #262e27;
+  --color-text: #edf1ea;
+  --color-text-muted: #a9b5a6;
+  --color-border: #384038;
+
+  --color-primary: #5fae7e;
+  --color-primary-hover: #7cc496;
+  --color-accent: #ea7a48;
+  --color-accent-hover: #f0946c;
+  --color-tag: #e8b84b;
+  --color-tag-ink: #2a2005;
+
+  --color-success: #5fae7e;
+  --color-warning: #e8b84b;
+  --color-error: #e5675a;
+
+  --color-allergen: #e2547b;
+  --color-allergen-ink: #3a0416;
+
+  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
+  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.45);
+}

apps/admin-web/src/styles/global.scss

@@ -0,0 +1,149 @@
+// =============================================================================
+// Global stylesheet — imported exactly once, in main.tsx. Contains only
+// truly app-wide rules: the theme tokens and a minimal reset/base styling
+// that every page inherits. Anything specific to one component or page
+// belongs in a .scss file colocated next to that component/page instead.
+// =============================================================================
+
+@use "./theme";
+
+// Include borders/padding in an element's declared width/height everywhere,
+// rather than the browser default of adding them on top.
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+// Minimal reset: remove the default body margin so pages can control their
+// own layout without fighting the browser's default 8px margin.
+body {
+  margin: 0;
+  font-family: var(--font-body);
+  font-size: var(--font-size-base);
+  line-height: 1.55;
+  color: var(--color-text);
+  background: var(--color-background);
+}
+
+// Headings use the condensed "label" face app-wide — see _theme.scss for
+// the rationale. `text-wrap: balance` avoids a lone short word wrapping
+// onto its own line in multi-line titles.
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin: 0;
+  font-family: var(--font-display);
+  font-weight: 700;
+  text-wrap: balance;
+}
+
+// Default to the page-title size; a heading used as a smaller component
+// title (e.g. the auth card's <h1>) overrides this in its own stylesheet.
+h1 {
+  font-size: var(--font-size-2xl);
+}
+
+// A visible, consistent focus ring for keyboard navigation — the browser
+// default varies a lot between elements and browsers.
+:focus-visible {
+  outline: 2px solid var(--color-accent);
+  outline-offset: 2px;
+}
+
+// Checkbox/radio appearance, app-wide — "selectable card" style: the native
+// control itself is visually hidden (still real, focusable and
+// screen-reader-visible — see the `input[type=...]` rule below, not
+// `display: none`) and the whole label row it lives in becomes the
+// interactive surface instead: a flat bordered box that fills in with a
+// tinted background + primary border once selected, with a checkmark
+// fading in on the leading edge.
+//
+// The base (unselected) look below is detected structurally with `:has()`
+// — safe, since "does this label contain a checkbox/radio" never changes
+// after mount. The *selected* look is instead driven by the `is-selected`
+// class {@link CheckboxOption}/{@link RadioOption} (components/ui/) toggle
+// in JS from the same boolean their caller already passes to `checked` —
+// chaining a second `:has(:checked)` to react to that live state turned
+// out to be unreliable across browsers, so this only needs one
+// always-true `:has()`.
+//
+// Every checkbox/radio in the app goes through this one place (the allergy
+// grid, the theme picker, anywhere future) rather than each feature styling
+// its own — see profile-forms.scss / settings-pages.scss, which only
+// arrange these within their own layout (grid vs. stacked list) and
+// intentionally don't re-style the control/label look itself.
+label:has(> input[type="checkbox"]),
+label:has(> input[type="radio"]) {
+  position: relative;
+  display: flex;
+  align-items: center;
+  gap: var(--space-xs);
+  padding: var(--space-xs) var(--space-sm);
+  // Overrides the generic `label { font-weight: 600 }` base rule
+  // (profile-forms.scss) — without this, an *unselected* row reads just as
+  // bold as a selected one (only `.allergy-select__option` happened to set
+  // its own 400 already; `.theme-select__option` didn't, so its rows were
+  // all permanently bold until this was centralized here).
+  font-weight: 400;
+  border: 1.5px solid var(--color-border);
+  border-radius: var(--radius-base);
+  background: var(--color-surface);
+  cursor: pointer;
+  transition:
+    background-color 0.15s ease,
+    border-color 0.15s ease;
+
+  &:hover {
+    border-color: var(--color-primary);
+  }
+
+  &.is-selected {
+    border-color: var(--color-primary);
+    background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
+    color: var(--color-primary);
+    font-weight: 600;
+  }
+
+  &:has(:focus-visible) {
+    outline: 2px solid var(--color-accent);
+    outline-offset: 2px;
+  }
+}
+
+// The control itself is removed from the visual flow — hidden the
+// "sr-only" way (not `display: none`) so it stays focusable/tabbable and
+// announced correctly by screen readers; the label above carries the
+// entire visible selected/unchecked look.
+input[type="checkbox"],
+input[type="radio"] {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  margin: 0;
+  opacity: 0;
+}
+
+// The checkmark — a real element (see components/ui/Checkbox.tsx /
+// Radio.tsx) shown via the same `is-selected` class as the label's own
+// look above, not a separate CSS-only trigger. Scaled in from nothing so
+// toggling has a bit of motion. Same mark for both checkbox and radio: one
+// consistent "selected" language app-wide rather than a checkmark here and
+// a dot there. Sits first in the row (before the label text, per DOM
+// order) — a classic "control on the left" layout rather than trailing.
+.check-mark {
+  flex: none;
+  width: 0.9rem;
+  height: 0.9rem;
+  background: var(--color-primary);
+  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
+  transform: scale(0);
+  transition: transform 0.1s ease;
+}
+
+.is-selected .check-mark {
+  transform: scale(1);
+}

apps/admin-web/src/vite-env.d.ts

@@ -0,0 +1,5 @@
+/// <reference types="vite/client" />
+
+// Injected by `define` in vite.config.ts, sourced from package.json's
+// version field — rendered in AdminLayout.tsx.
+declare const __APP_VERSION__: string;

apps/admin-web/tsconfig.app.json

@@ -0,0 +1,14 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "jsx": "react-jsx",
+    "types": ["vite/client"],
+    "noEmit": true,
+    "composite": true,
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo"
+  },
+  "include": ["src"]
+}

apps/admin-web/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "module": "ESNext",
+    "moduleResolution": "Bundler"
+  },
+  "files": [],
+  "references": [{ "path": "./tsconfig.app.json" }, { "path": "./tsconfig.node.json" }]
+}

apps/admin-web/tsconfig.node.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "composite": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "types": ["node"]
+  },
+  "include": ["vite.config.ts"]
+}

apps/admin-web/vite.config.ts

@@ -0,0 +1,19 @@
+import { readFileSync } from "node:fs";
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
+
+// Read once at config-eval time — same trick as apps/web's vite.config.ts.
+const pkg = JSON.parse(readFileSync(new URL("./package.json", import.meta.url), "utf-8"));
+
+export default defineConfig({
+  plugins: [react()],
+  server: { port: 5174 },
+  css: {
+    preprocessorOptions: {
+      scss: { api: "modern-compiler" },
+    },
+  },
+  define: {
+    __APP_VERSION__: JSON.stringify(pkg.version),
+  },
+});

apps/api/.env.test.example

@@ -27,3 +27,10 @@ INTENT_SERVICE_SECRET=changeme-generate-a-real-random-secret-at-least-32-chars
 # success path (a request with a matching secret); every other test runs
 # fine without it. Any value at least 32 chars works locally.
 # INTERNAL_WORKER_SECRET=changeme-generate-a-real-random-secret-at-least-32-chars
+
+# Optional — set to run admin-auth.test.ts's login success path and the
+# requireAdmin-guarded routes (any value at least 32 chars). Left unset,
+# those cases self-skip and only the "no secret configured -> 401" path
+# runs. Same "optional in test, fail-closed at runtime" posture as
+# INTERNAL_WORKER_SECRET above.
+# ADMIN_JWT_SECRET=changeme-generate-a-real-random-secret-at-least-32-chars

apps/api/prisma/migrations/20260828120000_admin_user/migration.sql

@@ -0,0 +1,15 @@
+-- CreateTable
+CREATE TABLE "admin_users" (
+    "id" SERIAL NOT NULL,
+    "email" TEXT NOT NULL,
+    "password_hash" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "token_version" INTEGER NOT NULL DEFAULT 0,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "last_login_at" TIMESTAMP(3),
+
+    CONSTRAINT "admin_users_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "admin_users_email_key" ON "admin_users"("email");

apps/api/prisma/migrations/20260828130000_admin_metrics/migration.sql

@@ -0,0 +1,32 @@
+-- AlterTable: usage-metrics timestamps. Existing rows adopt the migration's
+-- own timestamp (acceptable one-off skew for trend charts — same posture as
+-- the ingredient_unit_catalog migration).
+ALTER TABLE "user_profiles" ADD COLUMN "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP;
+ALTER TABLE "recipe" ADD COLUMN "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP;
+ALTER TABLE "planning" ADD COLUMN "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP;
+ALTER TABLE "planning_item" ADD COLUMN "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP;
+
+-- CreateTable
+CREATE TABLE "analytics_events" (
+    "id" SERIAL NOT NULL,
+    "type" TEXT NOT NULL,
+    "actor_type" TEXT NOT NULL,
+    "actor_id" INTEGER,
+    "context" JSONB,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "analytics_events_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "analytics_events_type_created_at_idx" ON "analytics_events"("type", "created_at");
+
+-- CreateTable
+CREATE TABLE "worker_heartbeats" (
+    "worker_key" TEXT NOT NULL,
+    "last_seen_at" TIMESTAMP(3) NOT NULL,
+    "last_run_at" TIMESTAMP(3),
+    "last_result" JSONB,
+
+    CONSTRAINT "worker_heartbeats_pkey" PRIMARY KEY ("worker_key")
+);

apps/api/prisma/schema.prisma

@@ -100,9 +100,13 @@ model UserProfile {
   passwordHash String @map("password_hash")
   /// Bumped to invalidate previously-issued JWTs (e.g. on password change).
   /// Not in the original spec doc — required for stateless JWT auth.
-  tokenVersion Int    @default(0) @map("token_version")
-  houseId      Int?   @map("house_id")
-  dietId       Int?   @map("diet_id")
+  tokenVersion Int      @default(0) @map("token_version")
+  houseId      Int?     @map("house_id")
+  dietId       Int?     @map("diet_id")
+  /// See `Planning.createdAt` — same admin-metrics-only timestamp, added by
+  /// the `admin_metrics` migration for the dashboard's signup curve. No
+  /// application code reads it (auth doesn't need it).
+  createdAt    DateTime @default(now()) @map("created_at")
 
   house               House?                          @relation("HouseMember", fields: [houseId], references: [id], onDelete: SetNull)
   diet                Diet?                           @relation(fields: [dietId], references: [id], onDelete: SetNull)
@@ -192,6 +196,12 @@ model Planning {
   startDate  DateTime @map("start_date") @db.Date
   finishDate DateTime @map("finish_date") @db.Date
   houseId    Int      @map("house_id")
+  /// When this planning row was first created. Added by the `admin_metrics`
+  /// migration purely for the admin dashboard's activity curves — no
+  /// application code reads it. Rows that predate the migration all get the
+  /// migration's own timestamp (same acceptable one-off skew as the
+  /// `ingredient_unit_catalog` migration), which is fine for a trend chart.
+  createdAt  DateTime @default(now()) @map("created_at")
 
   house House          @relation(fields: [houseId], references: [id], onDelete: Cascade)
   items PlanningItem[]
@@ -200,12 +210,14 @@ model Planning {
 }
 
 model PlanningItem {
-  id         Int    @id @default(autoincrement())
-  planningId Int    @map("planning_id")
-  weekDay    String @map("week_day")
+  id         Int      @id @default(autoincrement())
+  planningId Int      @map("planning_id")
+  weekDay    String   @map("week_day")
   meal       String
-  recipeId   Int    @map("recipe_id")
+  recipeId   Int      @map("recipe_id")
   portions   Int
+  /// See `Planning.createdAt` — same admin-metrics-only timestamp.
+  createdAt  DateTime @default(now()) @map("created_at")
 
   planning Planning @relation(fields: [planningId], references: [id], onDelete: Cascade)
   recipe   Recipe   @relation(fields: [recipeId], references: [id])
@@ -319,6 +331,10 @@ model Recipe {
   /// the author had no household yet.
   authorHouseId Int?             @map("author_house_id")
   visibility    RecipeVisibility @default(PERSONAL)
+  /// See `Planning.createdAt` — same admin-metrics-only timestamp, added by
+  /// the `admin_metrics` migration for the dashboard's "recipes created"
+  /// curve. No application code reads it.
+  createdAt     DateTime         @default(now()) @map("created_at")
 
   author        UserProfile        @relation(fields: [authorId], references: [id])
   authorHouse   House?             @relation(fields: [authorHouseId], references: [id], onDelete: SetNull)
@@ -897,3 +913,81 @@ model TechStepTrainingSuggestion {
 
   @@map("tech_step_training_suggestion")
 }
+
+// -----------------------------------------------------------------------------
+// Admin application
+// A separate operations app (usage metrics, microservice monitoring, tech-step
+// correction triage) — see specs/backend-architecture.md's "admin" section.
+// -----------------------------------------------------------------------------
+
+/// An operator of the admin application (`apps/admin-web` / the `/admin/*`
+/// API surface). Deliberately its **own** table with **no relation** to
+/// `UserProfile`: admin access is a completely separate concern from being
+/// an end user of the recipe app — a person can be one, both or neither,
+/// and the two auth mechanisms (`requireAdmin` vs `requireAuth`, distinct
+/// cookies, distinct JWT secrets) never overlap. No self-service signup —
+/// the first row is created out-of-band by `src/scripts/create-admin.ts`,
+/// and (for now) there's no in-app admin-management UI.
+model AdminUser {
+  id           Int       @id @default(autoincrement())
+  email        String    @unique
+  /// argon2 hash of the password — same hashing as `UserProfile.passwordHash`
+  /// (`auth.service.ts`'s `hashOptions`, cheaper cost under NODE_ENV=test).
+  passwordHash String    @map("password_hash")
+  /// Display name shown in the admin UI's account menu.
+  name         String
+  /// Bumped to invalidate previously-issued admin JWTs — same mechanism as
+  /// `UserProfile.tokenVersion`, checked on every request by `requireAdmin`.
+  tokenVersion Int       @default(0) @map("token_version")
+  createdAt    DateTime  @default(now()) @map("created_at")
+  /// Stamped on every successful login — a cheap "is this account still in
+  /// use" signal for the operator managing admins by hand.
+  lastLoginAt  DateTime? @map("last_login_at")
+
+  @@map("admin_users")
+}
+
+/// One recorded product event, for the admin dashboard's usage metrics.
+/// Written fire-and-forget by `lib/analytics.service.ts`'s `recordEvent`
+/// from a handful of key service methods (signup, recipe import/create,
+/// planning add, cooking-session open, tech-step correction, shopping-list
+/// view) — never on the request's critical path, so a failed insert is
+/// logged and swallowed, never surfaced to the user.
+///
+/// `type` is a free `String` (`"user.signup"`, `"recipe.imported"`…), not
+/// an enum: adding a new event to instrument is a one-line call site
+/// change with **no migration**. `actorId` is a `UserProfile.id` when
+/// `actorType == "user"` but carries **no FK** — an event is an immutable
+/// historical fact that must outlive the account it describes (a deleted
+/// user's signup still counts on the curve). `context` is a small free
+/// JSON blob (`{ sourceKey, recipeId, … }`) for slicing later; nothing
+/// queries into it today.
+model AnalyticsEvent {
+  id        Int      @id @default(autoincrement())
+  type      String
+  actorType String   @map("actor_type")
+  actorId   Int?     @map("actor_id")
+  context   Json?
+  createdAt DateTime @default(now()) @map("created_at")
+
+  @@index([type, createdAt])
+  @@map("analytics_events")
+}
+
+/// Liveness/last-run record for a background worker that has no inbound
+/// HTTP surface of its own — one row per worker (`workerKey`, today only
+/// `"tech-step-llm-worker"`). The worker POSTs `/internal/tech-steps/heartbeat`
+/// (`requireInternalWorker`) on boot, on every scheduler tick, and after
+/// each job; the admin monitoring board reads this to show the worker as
+/// up / stale / down and to surface its last job result. Upserted, never
+/// accumulated — only the latest state matters.
+model WorkerHeartbeat {
+  workerKey  String    @id @map("worker_key")
+  lastSeenAt DateTime  @map("last_seen_at")
+  /// Set only by a `"job"` heartbeat — the last time the worker actually ran a job (vs. just a tick proving it's alive).
+  lastRunAt  DateTime? @map("last_run_at")
+  /// Small JSON summary of that last job (`{ job, ok, counts }`).
+  lastResult Json?     @map("last_result")
+
+  @@map("worker_heartbeats")
+}

apps/api/src/app.ts

@@ -5,6 +5,7 @@ import type { Express, Request, Response } from "express";
 import { env } from "./config/env.js";
 import { errorLogger } from "./middlewares/error-logger.js";
 import { requestLogger } from "./middlewares/request-logger.js";
+import { adminRouter } from "./modules/admin/admin.routes.js";
 import { authRouter } from "./modules/auth/auth.routes.js";
 import { houseRouter } from "./modules/house/house.routes.js";
 import { techStepWorkerRouter } from "./modules/internal/tech-step-worker.routes.js";
@@ -32,13 +33,19 @@ export function createServer(): ExpressServer {
   // pipeline (its "finish" listener still fires for a request that never
   // makes it past CORS/body-parsing, not just ones that reach a route).
   server.addMiddleware(requestLogger);
-  server.setupCore({ corsOrigin: env.CORS_ORIGIN });
+  // Two allowed origins: the main app (`CORS_ORIGIN`) and the separate
+  // admin app (`ADMIN_CORS_ORIGIN`). The `cors` package matches an incoming
+  // `Origin` against any entry of the list.
+  server.setupCore({ corsOrigin: [env.CORS_ORIGIN, env.ADMIN_CORS_ORIGIN] });
 
   server.addRoute("get", "/health", (_req: Request, res: Response) => {
     res.status(200).json({ status: "ok" });
   });
 
   server.mountRouter("/auth", authRouter);
+  // Admin application surface (`apps/admin-web`) — its own auth
+  // (`requireAdmin`, distinct cookie/secret), never the end-user session.
+  server.mountRouter("/admin", adminRouter);
   server.mountRouter("/house", houseRouter);
   // Not user-facing — `services/tech-step-llm-worker` only, guarded by
   // `requireInternalWorker` on every route within (see that router's own

apps/api/src/config/env.ts

@@ -90,6 +90,27 @@ const envSchema = z.object({
    * every technique detection request failing one at a time.
    */
   INTENT_SERVICE_SECRET: z.string().min(32, "INTENT_SERVICE_SECRET must be at least 32 characters"),
+  /**
+   * Secret used to sign/verify the **admin** session JWT (`lib/admin-jwt.ts`)
+   * — entirely separate from `JWT_SECRET`, so an end-user session token can
+   * never be replayed against `/admin/*` and vice versa. `.optional()`
+   * (unlike `JWT_SECRET`): an instance that doesn't run the admin app at
+   * all never needs it — but `requireAdmin` (`middlewares/require-admin.ts`)
+   * rejects every request outright when it's unset, so the surface fails
+   * closed, same posture as `INTERNAL_WORKER_SECRET`.
+   */
+  ADMIN_JWT_SECRET: z
+    .string()
+    .min(32, "ADMIN_JWT_SECRET must be at least 32 characters")
+    .optional(),
+  /** Name of the httpOnly cookie carrying the admin session JWT — must differ from `AUTH_COOKIE_NAME` so the two sessions coexist in one browser. */
+  ADMIN_COOKIE_NAME: z.string().default("admin_session"),
+  /** Origin `apps/admin-web` is served from — added to the CORS allow-list alongside `CORS_ORIGIN`. */
+  ADMIN_CORS_ORIGIN: z.string().default("http://localhost:5174"),
+  /** Optional seed values read by `src/scripts/create-admin.ts` when its `--email`/`--password`/`--name` flags are omitted — never used by the running server. */
+  ADMIN_INITIAL_EMAIL: z.string().optional(),
+  ADMIN_INITIAL_PASSWORD: z.string().optional(),
+  ADMIN_INITIAL_NAME: z.string().optional(),
 });
 
 /** Parsed, validated environment — import this instead of reading `process.env` directly anywhere else. */

apps/api/src/lib/admin-jwt.ts

@@ -0,0 +1,59 @@
+import jwt from "jsonwebtoken";
+import { env } from "../config/env.js";
+
+/**
+ * Decoded contents of an **admin** session JWT, once verified. Deliberately
+ * a separate token type from `lib/jwt.ts`'s `AuthTokenPayload`: the admin
+ * app authenticates against its own `AdminUser` table with its own secret
+ * (`ADMIN_JWT_SECRET`), so an end-user session token and an admin session
+ * token are never interchangeable.
+ */
+export interface AdminTokenPayload {
+  /** `AdminUser.id` this token authenticates. */
+  adminUserId: number;
+  /** Snapshot of `AdminUser.tokenVersion` at sign time — re-checked against the DB on every request (see `requireAdmin`) to allow server-side invalidation. */
+  tokenVersion: number;
+}
+
+/**
+ * The admin JWT secret, or a thrown error if the instance never configured
+ * one. A misconfigured admin deployment surfaces as a loud 500 on login
+ * rather than a silently-unsigned token; a deployment that doesn't run the
+ * admin app at all never reaches here (nothing calls sign/verify), and
+ * `requireAdmin` independently fails closed on the same unset value.
+ */
+function adminSecret(): string {
+  if (env.ADMIN_JWT_SECRET === undefined) {
+    throw new Error("ADMIN_JWT_SECRET is not configured — cannot issue or verify admin sessions");
+  }
+  return env.ADMIN_JWT_SECRET;
+}
+
+/** Signs a new admin session JWT, expiring per `JWT_EXPIRES_IN` (shared with the end-user token — same "how long a session lasts" policy). */
+export function signAdminToken(payload: AdminTokenPayload): string {
+  return jwt.sign(
+    { sub: String(payload.adminUserId), tokenVersion: payload.tokenVersion },
+    adminSecret(),
+    { expiresIn: env.JWT_EXPIRES_IN as jwt.SignOptions["expiresIn"] },
+  );
+}
+
+/**
+ * Verifies an admin session JWT's signature/expiry and decodes it back
+ * into an {@link AdminTokenPayload}.
+ *
+ * @throws {Error} if the token is invalid/expired (from `jwt.verify`) or
+ *   structurally malformed (missing/wrong-typed claims).
+ */
+export function verifyAdminToken(token: string): AdminTokenPayload {
+  const decoded = jwt.verify(token, adminSecret());
+  const adminUserId = typeof decoded === "object" ? Number(decoded.sub) : Number.NaN;
+  if (
+    typeof decoded !== "object" ||
+    Number.isNaN(adminUserId) ||
+    typeof decoded.tokenVersion !== "number"
+  ) {
+    throw new Error("Malformed admin token payload");
+  }
+  return { adminUserId, tokenVersion: decoded.tokenVersion };
+}

apps/api/src/lib/analytics.service.ts

@@ -0,0 +1,65 @@
+import type { Prisma } from "@prisma/client";
+import { prisma } from "../db/prisma.js";
+import { logger } from "./logger.service.js";
+
+/** Who caused an {@link AnalyticsEvent}. `"user"` pairs with an `actorId` (`UserProfile.id`); `"system"` is a background job; `"anon"` is an unauthenticated request. */
+export type AnalyticsActorType = "user" | "system" | "anon";
+
+/** Optional context for {@link AnalyticsService.recordEvent}. */
+export interface RecordEventOptions {
+  /** `UserProfile.id` — set together with `actorType: "user"` (the default when this is present). */
+  actorId?: number;
+  /** Overrides the inferred actor type (`"user"` when `actorId` is set, else `"anon"`). */
+  actorType?: AnalyticsActorType;
+  /** Small free-form blob for later slicing (`{ sourceKey, recipeId, … }`) — nothing queries into it today. */
+  context?: Prisma.InputJsonValue;
+}
+
+/**
+ * Records product usage events for the admin dashboard's metrics (see the
+ * `AnalyticsEvent` model doc comment). A class rather than a bare function
+ * — same convention as `LoggerService`/`ErrorHandlerService`: `public`
+ * `recordEvent` is the API, `_insert` is the internal it fans out to.
+ *
+ * **Fire-and-forget by contract**: `recordEvent` returns `void`, not a
+ * promise. The insert runs detached, and a failure is logged at `warn` and
+ * swallowed — analytics must never add latency to, or fail, the request
+ * that triggered it. Call sites therefore never `await` it.
+ */
+export class AnalyticsService {
+  public recordEvent(type: string, options: RecordEventOptions = {}): void {
+    const actorType: AnalyticsActorType =
+      options.actorType ?? (options.actorId !== undefined ? "user" : "anon");
+
+    void this._insert(type, actorType, options).catch((err: unknown) => {
+      logger.warn("Analytics event insert failed", {
+        eventType: type,
+        error: err instanceof Error ? err.message : String(err),
+      });
+    });
+  }
+
+  private async _insert(
+    type: string,
+    actorType: AnalyticsActorType,
+    options: RecordEventOptions,
+  ): Promise<void> {
+    try {
+      await prisma.analyticsEvent.create({
+        data: {
+          type,
+          actorType,
+          actorId: options.actorId ?? null,
+          context: options.context,
+        },
+      });
+    } catch (err) {
+      // Rethrown so `recordEvent`'s `.catch` above logs it — this layer
+      // just isn't allowed a bare `await` per the repo's convention.
+      throw err;
+    }
+  }
+}
+
+/** Single shared instance — stateless, same reasoning as `logger`. */
+export const analytics = new AnalyticsService();

apps/api/src/lib/safe-admin.ts

@@ -0,0 +1,20 @@
+import type { AdminUserView } from "@batch-cooking/shared";
+import type { AdminUser } from "@prisma/client";
+
+/**
+ * Shapes a Prisma `AdminUser` into the {@link AdminUserView} sent to the
+ * admin client — drops `passwordHash` **and** `tokenVersion` (an internal
+ * invalidation counter the client never needs, unlike `SafeUserProfile`
+ * which does expose it), and serializes the two dates to ISO strings. The
+ * one place this security-relevant stripping happens, same role as
+ * `toSafeProfile` (`lib/safe-profile.ts`).
+ */
+export function toSafeAdmin(admin: AdminUser): AdminUserView {
+  return {
+    id: admin.id,
+    email: admin.email,
+    name: admin.name,
+    createdAt: admin.createdAt.toISOString(),
+    lastLoginAt: admin.lastLoginAt === null ? null : admin.lastLoginAt.toISOString(),
+  };
+}

apps/api/src/middlewares/require-admin.ts

@@ -0,0 +1,71 @@
+import { HttpError } from "@batch-cooking/error-tools";
+import { type AdminUserView, ErrorCode } from "@batch-cooking/shared";
+import type { NextFunction, Request, Response } from "express";
+import { env } from "../config/env.js";
+import { prisma } from "../db/prisma.js";
+import { verifyAdminToken } from "../lib/admin-jwt.js";
+import { toSafeAdmin } from "../lib/safe-admin.js";
+
+/**
+ * Shape of `res.locals` once {@link requireAdmin} has run successfully.
+ * Type a handler's response as `Response<unknown, AdminLocals>` to read
+ * `res.locals.adminUser` fully typed, no cast — same `res.locals` (not
+ * global `Request` augmentation) approach as {@link AuthLocals}
+ * (`require-auth.ts`).
+ */
+export interface AdminLocals {
+  /** The authenticated admin operator, resolved from the admin session cookie's JWT. */
+  adminUser: AdminUserView;
+}
+
+/**
+ * Express middleware guarding every `/admin/*` route — the operations app
+ * (`apps/admin-web`) authenticating as an `AdminUser`. Reads the admin
+ * session cookie (`ADMIN_COOKIE_NAME`, deliberately **not** the same cookie
+ * as end-user sessions), verifies the JWT against `ADMIN_JWT_SECRET`
+ * (a different secret than `JWT_SECRET`), and re-checks `tokenVersion`
+ * against the database so a stateless JWT can still be invalidated
+ * server-side.
+ *
+ * A completely separate mechanism from {@link requireAuth}, not layered on
+ * it: an end-user session token and an admin session token are never
+ * interchangeable in either direction.
+ *
+ * Fails closed: an unset `ADMIN_JWT_SECRET` (the default for any instance
+ * that doesn't run the admin app) makes {@link verifyAdminToken} throw, so
+ * every request is rejected rather than the surface left open — same
+ * posture as `requireInternalWorker`.
+ *
+ * @throws {HttpError} `401 NOT_AUTHENTICATED` for any failure — missing
+ *   cookie, malformed/expired JWT, unknown admin, stale tokenVersion, or
+ *   no secret configured. Never distinguishes the reason.
+ */
+export async function requireAdmin(
+  req: Request,
+  res: Response<unknown, AdminLocals>,
+  next: NextFunction,
+) {
+  try {
+    const token = req.cookies?.[env.ADMIN_COOKIE_NAME];
+    if (typeof token !== "string") {
+      throw new HttpError(401, ErrorCode.NOT_AUTHENTICATED, "Not authenticated");
+    }
+
+    const payload = verifyAdminToken(token);
+    const admin = await prisma.adminUser.findUnique({ where: { id: payload.adminUserId } });
+
+    if (!admin || admin.tokenVersion !== payload.tokenVersion) {
+      throw new HttpError(401, ErrorCode.NOT_AUTHENTICATED, "Not authenticated");
+    }
+
+    res.locals.adminUser = toSafeAdmin(admin);
+    next();
+  } catch (err) {
+    if (err instanceof HttpError) {
+      next(err);
+    } else {
+      // Covers jwt.verify failures and the unset-secret throw from verifyAdminToken.
+      next(new HttpError(401, ErrorCode.NOT_AUTHENTICATED, "Not authenticated"));
+    }
+  }
+}

apps/api/src/modules/admin/admin-auth.routes.ts

@@ -0,0 +1,51 @@
+import { wrapAsyncHandler } from "@batch-cooking/express-tools";
+import { adminLoginSchema } from "@batch-cooking/shared";
+import { type CookieOptions, type Response, Router } from "express";
+import { env } from "../../config/env.js";
+import { type AdminLocals, requireAdmin } from "../../middlewares/require-admin.js";
+import { adminLogin } from "./admin-auth.service.js";
+
+/** Router mounted at `/admin/auth` (via `admin.routes.ts`) — admin login, logout, current-admin. No signup: admins are created out-of-band (`src/scripts/create-admin.ts`). */
+export const adminAuthRouter = Router();
+
+const SEVEN_DAYS_MS = 7 * 24 * 60 * 60 * 1000;
+
+/**
+ * Cookie options for the admin session — same shape as `auth.routes.ts`'s
+ * end-user cookie (httpOnly, `Secure` in production unless `COOKIE_SECURE`
+ * overrides, `SameSite=Lax`), just written under {@link env.ADMIN_COOKIE_NAME}
+ * so the two sessions never collide in one browser.
+ */
+const adminCookieOptions: CookieOptions = {
+  httpOnly: true,
+  secure: env.COOKIE_SECURE ?? env.NODE_ENV === "production",
+  sameSite: "lax",
+  maxAge: SEVEN_DAYS_MS,
+};
+
+// `res.clearCookie` sets its own expiry — passing `maxAge` alongside is
+// deprecated as of Express 4.20, so the logout route reuses the options
+// minus that one field (same trick as `auth.routes.ts`).
+const { maxAge: _maxAge, ...clearAdminCookieOptions } = adminCookieOptions;
+
+/** Verifies admin credentials and starts an admin session. */
+adminAuthRouter.post(
+  "/login",
+  wrapAsyncHandler(async (req, res) => {
+    const input = adminLoginSchema.parse(req.body);
+    const { admin, token } = await adminLogin(input);
+    res.cookie(env.ADMIN_COOKIE_NAME, token, adminCookieOptions);
+    res.status(200).json(admin);
+  }),
+);
+
+/** Ends the admin session by clearing the cookie. Stateless JWT — nothing to revoke server-side beyond bumping `tokenVersion` (no UI for that yet). */
+adminAuthRouter.post("/logout", (_req, res) => {
+  res.clearCookie(env.ADMIN_COOKIE_NAME, clearAdminCookieOptions);
+  res.status(204).end();
+});
+
+/** Returns the currently authenticated admin. Behind `requireAdmin` — 401s if there's no valid admin session. */
+adminAuthRouter.get("/me", requireAdmin, (_req, res: Response<unknown, AdminLocals>) => {
+  res.status(200).json(res.locals.adminUser);
+});

apps/api/src/modules/admin/admin-auth.service.ts

@@ -0,0 +1,59 @@
+import { HttpError } from "@batch-cooking/error-tools";
+import { type AdminLoginInput, type AdminUserView, ErrorCode } from "@batch-cooking/shared";
+import argon2 from "argon2";
+import { env } from "../../config/env.js";
+import { prisma } from "../../db/prisma.js";
+import { signAdminToken } from "../../lib/admin-jwt.js";
+import { toSafeAdmin } from "../../lib/safe-admin.js";
+
+/** Result of a successful admin login: the safe admin view plus the signed admin session JWT to set as a cookie. */
+interface AdminAuthResult {
+  admin: AdminUserView;
+  token: string;
+}
+
+// Same reasoning as `auth.service.ts`'s `hashOptions`: argon2's real
+// defaults are deliberately expensive; the test suite hashes/verifies
+// against throwaway data many times per run, so a cheaper cost keeps it
+// fast without weakening anything real. Never applies outside NODE_ENV=test.
+const testHashOptions = { memoryCost: 8192, timeCost: 2, parallelism: 1 };
+const hashOptions = env.NODE_ENV === "test" ? testHashOptions : undefined;
+
+/** Exposed so `src/scripts/create-admin.ts` hashes exactly the same way `login` verifies. */
+export function hashAdminPassword(password: string): Promise<string> {
+  return argon2.hash(password, hashOptions);
+}
+
+/**
+ * Verifies an admin operator's credentials, stamps `lastLoginAt`, and
+ * issues a fresh admin session token.
+ *
+ * @throws {HttpError} `401 INVALID_CREDENTIALS` for either an unknown email
+ *   or a wrong password — deliberately indistinguishable, same reasoning as
+ *   `auth.service.ts`'s `login`.
+ */
+export async function adminLogin(input: AdminLoginInput): Promise<AdminAuthResult> {
+  try {
+    const admin = await prisma.adminUser.findUnique({ where: { email: input.email } });
+
+    if (!admin || !(await argon2.verify(admin.passwordHash, input.password))) {
+      throw new HttpError(401, ErrorCode.INVALID_CREDENTIALS, "Invalid email or password");
+    }
+
+    const updated = await prisma.adminUser.update({
+      where: { id: admin.id },
+      data: { lastLoginAt: new Date() },
+    });
+
+    const token = signAdminToken({
+      adminUserId: updated.id,
+      tokenVersion: updated.tokenVersion,
+    });
+    return { admin: toSafeAdmin(updated), token };
+  } catch (err) {
+    // Rethrown as-is — `wrapAsyncHandler`/the error middleware handles it,
+    // this service layer just isn't allowed a bare `await` per the repo's
+    // async/try-catch convention.
+    throw err;
+  }
+}

apps/api/src/modules/admin/admin-metrics.routes.ts

@@ -0,0 +1,22 @@
+import { wrapAsyncHandler } from "@batch-cooking/express-tools";
+import { getMetricsSchema } from "@batch-cooking/shared";
+import { Router } from "express";
+import { requireAdmin } from "../../middlewares/require-admin.js";
+import { getMetrics } from "./admin-metrics.service.js";
+
+/** Router mounted at `/admin/metrics` (via `admin.routes.ts`) — every route behind {@link requireAdmin}. */
+export const adminMetricsRouter = Router();
+
+/**
+ * Returns the admin dashboard's usage metrics — a `snapshot` of current
+ * totals plus `?days=` (7–365, default 30) days of daily time series (see
+ * {@link getMetrics}). Read-only; no side effects.
+ */
+adminMetricsRouter.get(
+  "/",
+  requireAdmin,
+  wrapAsyncHandler(async (req, res) => {
+    const { days } = getMetricsSchema.parse(req.query);
+    res.status(200).json(await getMetrics(days));
+  }),
+);

apps/api/src/modules/admin/admin-metrics.service.ts

@@ -0,0 +1,242 @@
+import type {
+  MetricsBreakdownRow,
+  MetricsEventSeries,
+  MetricsSnapshotView,
+  MetricsTimeBucket,
+  MetricsView,
+} from "@batch-cooking/shared";
+import { prisma } from "../../db/prisma.js";
+
+/** UTC `YYYY-MM-DD` for a `Date` — the bucket key used by {@link bucketByDay}. */
+function utcDayKey(date: Date): string {
+  return date.toISOString().slice(0, 10);
+}
+
+/** Start-of-day (UTC) `Date` that is `daysAgo` days before `from`. */
+function startOfUtcDay(from: Date, daysAgo: number): Date {
+  return new Date(Date.UTC(from.getUTCFullYear(), from.getUTCMonth(), from.getUTCDate() - daysAgo));
+}
+
+/**
+ * Buckets `dates` into `days` consecutive daily counts starting at `since`
+ * (a start-of-UTC-day `Date`). Every day in the window is present, days
+ * with no matching date carry `count: 0`. Pure/synchronous — factored out
+ * so the bucketing is unit-testable without a database, same split as
+ * `aggregateShoppingList`.
+ */
+export function bucketByDay(dates: Date[], since: Date, days: number): MetricsTimeBucket[] {
+  const counts = new Map<string, number>();
+  for (let i = 0; i < days; i++) {
+    const day = new Date(since.getTime() + i * 86_400_000);
+    counts.set(utcDayKey(day), 0);
+  }
+  for (const date of dates) {
+    const key = utcDayKey(date);
+    const current = counts.get(key);
+    if (current !== undefined) counts.set(key, current + 1);
+  }
+  return [...counts.entries()]
+    .sort(([a], [b]) => a.localeCompare(b))
+    .map(([date, count]) => ({ date, count }));
+}
+
+/** Shapes a Prisma `groupBy ... _count` result into the frontend's `{ key, label, count }` rows, sorted by count desc. */
+function toBreakdown(
+  rows: { key: string | null; count: number }[],
+  labelFor: (key: string) => string = (key) => key,
+): MetricsBreakdownRow[] {
+  return rows
+    .map(({ key, count }) => {
+      const resolved = key ?? "unknown";
+      return { key: resolved, label: labelFor(resolved), count };
+    })
+    .sort((a, b) => b.count - a.count);
+}
+
+/** Every point-in-time `COUNT` for the KPI tiles — see {@link MetricsSnapshotView}. */
+async function getSnapshot(): Promise<MetricsSnapshotView> {
+  try {
+    const [
+      admins,
+      users,
+      households,
+      activeHouseholdGroups,
+      recipes,
+      recipesManual,
+      recipesImported,
+      recipeBySourceGroups,
+      sources,
+      plannings,
+      planningItems,
+      steps,
+      detectedTechniques,
+      favorites,
+      corrections,
+      correctionsUnconsumed,
+      correctionsRemoval,
+      trainingSuggestions,
+      suggestionStatusGroups,
+      suggestionSourceTypeGroups,
+    ] = await Promise.all([
+      prisma.adminUser.count(),
+      prisma.userProfile.count(),
+      prisma.house.count(),
+      prisma.planning.groupBy({ by: ["houseId"] }),
+      prisma.recipe.count(),
+      prisma.recipe.count({ where: { sourceId: null } }),
+      prisma.recipe.count({ where: { sourceId: { not: null } } }),
+      prisma.recipe.groupBy({
+        by: ["sourceId"],
+        where: { sourceId: { not: null } },
+        _count: { _all: true },
+      }),
+      prisma.source.findMany({ select: { id: true, key: true, name: true } }),
+      prisma.planning.count(),
+      prisma.planningItem.count(),
+      prisma.step.count(),
+      prisma.stepTechStep.count(),
+      prisma.recipeFavorite.count(),
+      prisma.stepTechStepCorrection.count(),
+      prisma.stepTechStepCorrection.count({ where: { consumedAt: null } }),
+      prisma.stepTechStepCorrection.count({ where: { correctedTechStepId: null } }),
+      prisma.techStepTrainingSuggestion.count(),
+      prisma.techStepTrainingSuggestion.groupBy({ by: ["status"], _count: { _all: true } }),
+      prisma.techStepTrainingSuggestion.groupBy({ by: ["sourceType"], _count: { _all: true } }),
+    ]);
+
+    const sourceById = new Map(sources.map((source) => [source.id, source]));
+
+    return {
+      admins,
+      users,
+      households,
+      activeHouseholds: activeHouseholdGroups.length,
+      recipes,
+      recipesManual,
+      recipesImported,
+      recipesBySource: toBreakdown(
+        recipeBySourceGroups.map((group) => ({
+          key: group.sourceId === null ? null : (sourceById.get(group.sourceId)?.key ?? null),
+          count: group._count._all,
+        })),
+        (key) => {
+          const source = sources.find((s) => s.key === key);
+          return source ? source.name : key;
+        },
+      ),
+      plannings,
+      planningItems,
+      steps,
+      detectedTechniques,
+      favorites,
+      corrections,
+      correctionsUnconsumed,
+      correctionsRemoval,
+      trainingSuggestions,
+      trainingSuggestionsByStatus: toBreakdown(
+        suggestionStatusGroups.map((group) => ({ key: group.status, count: group._count._all })),
+      ),
+      trainingSuggestionsBySourceType: toBreakdown(
+        suggestionSourceTypeGroups.map((group) => ({
+          key: group.sourceType,
+          count: group._count._all,
+        })),
+      ),
+    };
+  } catch (err) {
+    throw err; // see recipe.service.ts's equivalent catch comment
+  }
+}
+
+/**
+ * Builds the admin dashboard's full metrics payload — a `snapshot` of
+ * current totals plus `rangeDays` days of daily time series, derived from
+ * the `createdAt` columns the `admin_metrics` migration added and from the
+ * `AnalyticsEvent` table. `days` is the caller-validated `?days=` value
+ * (see `getMetricsSchema`, 7–365).
+ */
+export async function getMetrics(days: number): Promise<MetricsView> {
+  try {
+    const now = new Date();
+    const since = startOfUtcDay(now, days - 1);
+
+    const [
+      snapshot,
+      signups,
+      recipesCreated,
+      planningItemsAdded,
+      correctionsSubmitted,
+      trainingSuggestions,
+      eventRows,
+    ] = await Promise.all([
+      getSnapshot(),
+      prisma.userProfile.findMany({
+        where: { createdAt: { gte: since } },
+        select: { createdAt: true },
+      }),
+      prisma.recipe.findMany({ where: { createdAt: { gte: since } }, select: { createdAt: true } }),
+      prisma.planningItem.findMany({
+        where: { createdAt: { gte: since } },
+        select: { createdAt: true },
+      }),
+      prisma.stepTechStepCorrection.findMany({
+        where: { createdAt: { gte: since } },
+        select: { createdAt: true },
+      }),
+      prisma.techStepTrainingSuggestion.findMany({
+        where: { createdAt: { gte: since } },
+        select: { createdAt: true },
+      }),
+      prisma.analyticsEvent.findMany({
+        where: { createdAt: { gte: since } },
+        select: { type: true, createdAt: true },
+      }),
+    ]);
+
+    const eventsByType = new Map<string, Date[]>();
+    for (const row of eventRows) {
+      const list = eventsByType.get(row.type);
+      if (list) list.push(row.createdAt);
+      else eventsByType.set(row.type, [row.createdAt]);
+    }
+    const events: MetricsEventSeries[] = [...eventsByType.entries()]
+      .sort(([a], [b]) => a.localeCompare(b))
+      .map(([type, dates]) => ({ type, buckets: bucketByDay(dates, since, days) }));
+
+    return {
+      generatedAt: now.toISOString(),
+      rangeDays: days,
+      snapshot,
+      series: {
+        signups: bucketByDay(
+          signups.map((r) => r.createdAt),
+          since,
+          days,
+        ),
+        recipesCreated: bucketByDay(
+          recipesCreated.map((r) => r.createdAt),
+          since,
+          days,
+        ),
+        planningItemsAdded: bucketByDay(
+          planningItemsAdded.map((r) => r.createdAt),
+          since,
+          days,
+        ),
+        correctionsSubmitted: bucketByDay(
+          correctionsSubmitted.map((r) => r.createdAt),
+          since,
+          days,
+        ),
+        trainingSuggestions: bucketByDay(
+          trainingSuggestions.map((r) => r.createdAt),
+          since,
+          days,
+        ),
+      },
+      events,
+    };
+  } catch (err) {
+    throw err; // see recipe.service.ts's equivalent catch comment
+  }
+}

apps/api/src/modules/admin/admin.routes.ts

@@ -0,0 +1,15 @@
+import { Router } from "express";
+import { adminAuthRouter } from "./admin-auth.routes.js";
+import { adminMetricsRouter } from "./admin-metrics.routes.js";
+
+/**
+ * Aggregator for the admin application's API surface, mounted at `/admin`
+ * in `app.ts`. Every sub-router here is for `apps/admin-web` only —
+ * `/admin/auth` is public (login), everything added later
+ * (`/admin/metrics`, `/admin/monitoring`, `/admin/tech-steps/*`) sits
+ * behind `requireAdmin` (`middlewares/require-admin.ts`).
+ */
+export const adminRouter = Router();
+
+adminRouter.use("/auth", adminAuthRouter);
+adminRouter.use("/metrics", adminMetricsRouter);

apps/api/src/modules/auth/auth.service.ts

@@ -8,6 +8,7 @@ import {
 import argon2 from "argon2";
 import { env } from "../../config/env.js";
 import { prisma } from "../../db/prisma.js";
+import { analytics } from "../../lib/analytics.service.js";
 import { signAuthToken } from "../../lib/jwt.js";
 import { toSafeProfile } from "../../lib/safe-profile.js";
 import { leaveCurrentHouse } from "../house/house.service.js";
@@ -58,6 +59,8 @@ export async function signup(input: SignupInput): Promise<AuthResult> {
       },
     });
 
+    analytics.recordEvent("user.signup", { actorId: profile.id });
+
     const token = signAuthToken({
       userProfileId: profile.id,
       tokenVersion: profile.tokenVersion,

apps/api/src/modules/planning/planning.service.ts

@@ -7,6 +7,7 @@ import {
   type PlanningView,
 } from "@batch-cooking/shared";
 import { prisma } from "../../db/prisma.js";
+import { analytics } from "../../lib/analytics.service.js";
 import { assertRecipeVisible } from "../recipe/recipe.service.js";
 
 /**
@@ -157,6 +158,11 @@ export async function addPlanningItem(
       include: { recipe: { select: { id: true, name: true } } },
     });
 
+    analytics.recordEvent("planning.item_added", {
+      actorId: viewerId,
+      context: { recipeId: input.recipeId, portions: input.portions },
+    });
+
     return {
       id: item.id,
       weekDay: item.weekDay,

apps/api/src/modules/recipe/recipe-tech-step-correction.service.ts

@@ -7,6 +7,7 @@ import {
 } from "@batch-cooking/shared";
 import type { Prisma } from "@prisma/client";
 import { prisma } from "../../db/prisma.js";
+import { analytics } from "../../lib/analytics.service.js";
 import { assertRecipeVisible, toStepTechStepViews } from "./recipe.service.js";
 
 /**
@@ -472,6 +473,16 @@ export async function submitTechStepCorrection(
       return { correction: createdCorrection, techSteps: freshTechSteps };
     });
 
+    analytics.recordEvent("tech_step.correction_submitted", {
+      actorId: correctorId,
+      context: {
+        recipeId,
+        stepId,
+        previousTechStepId: input.previousTechStepId ?? null,
+        correctedTechStepId: input.correctedTechStepId ?? null,
+      },
+    });
+
     return { correction: toCorrectionView(correction), techSteps: toStepTechStepViews(techSteps) };
   } catch (err) {
     throw err; // see loadVisibleStepOrThrow's catch comment

apps/api/src/modules/recipe/recipe.service.ts

@@ -14,6 +14,7 @@ import {
 } from "@batch-cooking/shared";
 import type { Prisma } from "@prisma/client";
 import { prisma } from "../../db/prisma.js";
+import { analytics } from "../../lib/analytics.service.js";
 import {
   type TechStepMatch,
   techStepClassifier,
@@ -616,6 +617,12 @@ async function createRecipeInternal(
       },
       include: recipeInclude(authorId),
     });
+
+    analytics.recordEvent(source === null ? "recipe.created" : "recipe.imported", {
+      actorId: authorId,
+      context: { recipeId: created.id, sourceId: source?.sourceId ?? null },
+    });
+
     return toRecipeView(created);
   } catch (err) {
     throw err; // see suitableForHouseholdWhere()'s catch comment above

apps/api/src/modules/shopping-list/shopping-list.routes.ts

@@ -3,6 +3,7 @@ import { HttpError } from "@batch-cooking/error-tools";
 import { wrapAsyncHandler } from "@batch-cooking/express-tools";
 import { ErrorCode, getShoppingListSchema } from "@batch-cooking/shared";
 import { Router } from "express";
+import { analytics } from "../../lib/analytics.service.js";
 import { type AuthLocals, requireAuth } from "../../middlewares/require-auth.js";
 import { getShoppingListForDate } from "./shopping-list.service.js";
 
@@ -31,6 +32,7 @@ shoppingListRouter.get(
     }
 
     const shoppingList = await getShoppingListForDate(res.locals.userProfile.houseId, date);
+    analytics.recordEvent("shopping_list.viewed", { actorId: res.locals.userProfile.id });
     res.status(200).json(shoppingList);
   }),
 );

apps/api/src/scripts/create-admin.ts

@@ -0,0 +1,56 @@
+import { env } from "../config/env.js";
+import { prisma } from "../db/prisma.js";
+import { hashAdminPassword } from "../modules/admin/admin-auth.service.js";
+
+/**
+ * Creates the first (or an additional) `AdminUser` for the admin
+ * application — there is no self-service admin signup, on purpose (see the
+ * `AdminUser` model doc comment in schema.prisma).
+ *
+ *   pnpm --filter api exec tsx src/scripts/create-admin.ts \
+ *     --email=ops@example.com --password='...' --name='Ops'
+ *
+ * Each flag falls back to the matching `ADMIN_INITIAL_*` env var when
+ * omitted, so a deployment can bake the first admin's credentials into its
+ * environment and run this once from the container without passing args.
+ * Refuses (exit 1) if an `AdminUser` with that email already exists —
+ * changing an existing admin's password is a manual DB operation for now,
+ * not something this script does.
+ */
+function flag(name: string): string | undefined {
+  const prefix = `--${name}=`;
+  const arg = process.argv.find((value) => value.startsWith(prefix));
+  return arg === undefined ? undefined : arg.slice(prefix.length);
+}
+
+async function createAdmin(): Promise<void> {
+  const email = (flag("email") ?? env.ADMIN_INITIAL_EMAIL)?.trim().toLowerCase();
+  const password = flag("password") ?? env.ADMIN_INITIAL_PASSWORD;
+  const name = (flag("name") ?? env.ADMIN_INITIAL_NAME)?.trim();
+
+  if (!email || !password || !name) {
+    throw new Error(
+      "Missing required input. Provide --email, --password and --name (or set ADMIN_INITIAL_EMAIL / ADMIN_INITIAL_PASSWORD / ADMIN_INITIAL_NAME).",
+    );
+  }
+  if (password.length < 8) {
+    throw new Error("Password must be at least 8 characters.");
+  }
+
+  const existing = await prisma.adminUser.findUnique({ where: { email } });
+  if (existing) {
+    throw new Error(`An admin with email "${email}" already exists (id ${existing.id}).`);
+  }
+
+  const passwordHash = await hashAdminPassword(password);
+  const admin = await prisma.adminUser.create({ data: { email, name, passwordHash } });
+  console.info(`Created admin #${admin.id} <${admin.email}> ("${admin.name}").`);
+}
+
+createAdmin()
+  .then(() => prisma.$disconnect())
+  .catch(async (err) => {
+    console.error(err instanceof Error ? err.message : err);
+    await prisma.$disconnect();
+    process.exit(1);
+  });

apps/api/test-support/reset-db.ts

@@ -47,7 +47,8 @@ export async function resetDatabase() {
       "planning_item", "planning",
       "recipe_ingredient", "step_tech_step", "step", "tech_step",
       "recipe", "ingredients", "sources", "unit",
-      "user_profiles", "diet", "house"
+      "user_profiles", "diet", "house",
+      "admin_users", "analytics_events", "worker_heartbeats"
     RESTART IDENTITY CASCADE;
   `);
   await seedReferenceData(prisma);

apps/api/test/admin-auth.test.ts

@@ -0,0 +1,149 @@
+import { ErrorCode, type SignupInput } from "@batch-cooking/shared";
+import { faker } from "@faker-js/faker";
+import { expect } from "chai";
+import request from "supertest";
+import { createApp } from "../src/app.js";
+import { env } from "../src/config/env.js";
+import { prisma } from "../src/db/prisma.js";
+import { hashAdminPassword } from "../src/modules/admin/admin-auth.service.js";
+import { resetDatabase } from "../test-support/reset-db.js";
+
+/** See `auth.test.ts` — same rationale for generating rather than hardcoding. */
+function buildSignupPayload(): SignupInput {
+  const firstName = faker.person.firstName();
+  const lastName = faker.person.lastName();
+  return {
+    firstName,
+    lastName,
+    email: faker.internet.email({ firstName, lastName }).toLowerCase(),
+    password: faker.internet.password({ length: 16 }),
+  };
+}
+
+/** Inserts an `AdminUser` straight into the DB (no signup route exists) and returns its plaintext password. */
+async function seedAdmin(): Promise<{ email: string; password: string }> {
+  const email = faker.internet.email().toLowerCase();
+  const password = faker.internet.password({ length: 16 });
+  await prisma.adminUser.create({
+    data: { email, name: faker.person.fullName(), passwordHash: await hashAdminPassword(password) },
+  });
+  return { email, password };
+}
+
+/** The admin login/verify path signs a JWT — self-skip those cases when no `ADMIN_JWT_SECRET` is configured (same posture as `tech-step-worker.routes.test.ts` with `INTERNAL_WORKER_SECRET`). */
+const adminSecretConfigured = env.ADMIN_JWT_SECRET !== undefined;
+
+describe("Admin auth", () => {
+  const app = createApp();
+
+  beforeEach(async () => {
+    await resetDatabase();
+  });
+
+  after(async () => {
+    await prisma.$disconnect();
+  });
+
+  describe("POST /admin/auth/login", () => {
+    it("rejects a missing body with 400 VALIDATION_ERROR", async () => {
+      const res = await request(app).post("/admin/auth/login").send({});
+      expect(res.status).to.equal(400);
+      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
+    });
+
+    it("rejects an unknown email with 401 INVALID_CREDENTIALS", async () => {
+      const res = await request(app)
+        .post("/admin/auth/login")
+        .send({ email: "nobody@example.com", password: "whatever" });
+      expect(res.status).to.equal(401);
+      expect(res.body.code).to.equal(ErrorCode.INVALID_CREDENTIALS);
+    });
+
+    it("rejects a wrong password with 401 INVALID_CREDENTIALS", async () => {
+      const { email } = await seedAdmin();
+      const res = await request(app)
+        .post("/admin/auth/login")
+        .send({ email, password: "not-the-password" });
+      expect(res.status).to.equal(401);
+      expect(res.body.code).to.equal(ErrorCode.INVALID_CREDENTIALS);
+    });
+
+    it("logs in with correct credentials, sets the admin cookie, stamps lastLoginAt, never leaks the hash", async function () {
+      if (!adminSecretConfigured) {
+        // biome-ignore lint/suspicious/noExplicitAny: mocha's `this.skip()` isn't typed without @types/mocha (not a dependency here).
+        (this as any).skip();
+        return;
+      }
+      const { email, password } = await seedAdmin();
+
+      const res = await request(app).post("/admin/auth/login").send({ email, password });
+
+      expect(res.status).to.equal(200);
+      expect(res.body.email).to.equal(email);
+      expect(res.body).to.not.have.property("passwordHash");
+      expect(res.body).to.not.have.property("tokenVersion");
+      expect(res.body.lastLoginAt).to.be.a("string");
+
+      const setCookie = res.headers["set-cookie"];
+      expect(Array.isArray(setCookie) ? setCookie.join(";") : String(setCookie)).to.include(
+        env.ADMIN_COOKIE_NAME,
+      );
+
+      const stored = await prisma.adminUser.findUniqueOrThrow({ where: { email } });
+      expect(stored.lastLoginAt).to.not.equal(null);
+    });
+  });
+
+  describe("GET /admin/auth/me", () => {
+    it("rejects a request with no admin cookie with 401 NOT_AUTHENTICATED", async () => {
+      const res = await request(app).get("/admin/auth/me");
+      expect(res.status).to.equal(401);
+      expect(res.body.code).to.equal(ErrorCode.NOT_AUTHENTICATED);
+    });
+
+    it("returns the admin behind a valid admin session", async function () {
+      if (!adminSecretConfigured) {
+        // biome-ignore lint/suspicious/noExplicitAny: see above.
+        (this as any).skip();
+        return;
+      }
+      const { email, password } = await seedAdmin();
+      const agent = request.agent(app);
+      await agent.post("/admin/auth/login").send({ email, password });
+
+      const res = await agent.get("/admin/auth/me");
+      expect(res.status).to.equal(200);
+      expect(res.body.email).to.equal(email);
+    });
+
+    it("stops returning the admin after logout", async function () {
+      if (!adminSecretConfigured) {
+        // biome-ignore lint/suspicious/noExplicitAny: see above.
+        (this as any).skip();
+        return;
+      }
+      const { email, password } = await seedAdmin();
+      const agent = request.agent(app);
+      await agent.post("/admin/auth/login").send({ email, password });
+
+      const logoutRes = await agent.post("/admin/auth/logout");
+      expect(logoutRes.status).to.equal(204);
+
+      const meRes = await agent.get("/admin/auth/me");
+      expect(meRes.status).to.equal(401);
+    });
+
+    it("does not accept an end-user session cookie as an admin session", async () => {
+      // An ordinary user logs in (sets the `session` cookie), then tries the
+      // admin surface with that same agent — `requireAdmin` reads a
+      // different cookie entirely, so this must 401 regardless of whether
+      // ADMIN_JWT_SECRET is configured.
+      const agent = request.agent(app);
+      await agent.post("/auth/signup").send(buildSignupPayload());
+
+      const res = await agent.get("/admin/auth/me");
+      expect(res.status).to.equal(401);
+      expect(res.body.code).to.equal(ErrorCode.NOT_AUTHENTICATED);
+    });
+  });
+});

apps/api/test/admin-metrics.test.ts

@@ -0,0 +1,149 @@
+import type { SignupInput } from "@batch-cooking/shared";
+import { faker } from "@faker-js/faker";
+import { expect } from "chai";
+import request from "supertest";
+import { createApp } from "../src/app.js";
+import { env } from "../src/config/env.js";
+import { prisma } from "../src/db/prisma.js";
+import { hashAdminPassword } from "../src/modules/admin/admin-auth.service.js";
+import { bucketByDay } from "../src/modules/admin/admin-metrics.service.js";
+import { resetDatabase } from "../test-support/reset-db.js";
+
+function buildSignupPayload(): SignupInput {
+  const firstName = faker.person.firstName();
+  const lastName = faker.person.lastName();
+  return {
+    firstName,
+    lastName,
+    email: faker.internet.email({ firstName, lastName }).toLowerCase(),
+    password: faker.internet.password({ length: 16 }),
+  };
+}
+
+async function seedAdmin(): Promise<{ email: string; password: string }> {
+  const email = faker.internet.email().toLowerCase();
+  const password = faker.internet.password({ length: 16 });
+  await prisma.adminUser.create({
+    data: { email, name: faker.person.fullName(), passwordHash: await hashAdminPassword(password) },
+  });
+  return { email, password };
+}
+
+/** Retries `check` until it stops throwing or `timeoutMs` elapses — `analytics.recordEvent` writes its row fire-and-forget, so a test observing it has to poll briefly. */
+async function eventually(check: () => Promise<void>, timeoutMs = 2000): Promise<void> {
+  const start = Date.now();
+  for (;;) {
+    try {
+      await check();
+      return;
+    } catch (err) {
+      if (Date.now() - start > timeoutMs) throw err;
+      await new Promise((resolve) => setTimeout(resolve, 50));
+    }
+  }
+}
+
+const adminSecretConfigured = env.ADMIN_JWT_SECRET !== undefined;
+
+describe("Admin metrics", () => {
+  describe("bucketByDay (pure)", () => {
+    const since = new Date("2026-08-01T00:00:00.000Z");
+
+    it("returns one zero-filled bucket per day, in date order", () => {
+      const result = bucketByDay([], since, 3);
+      expect(result).to.deep.equal([
+        { date: "2026-08-01", count: 0 },
+        { date: "2026-08-02", count: 0 },
+        { date: "2026-08-03", count: 0 },
+      ]);
+    });
+
+    it("counts dates into their UTC day and ignores dates outside the window", () => {
+      const result = bucketByDay(
+        [
+          new Date("2026-08-01T09:00:00Z"),
+          new Date("2026-08-01T23:30:00Z"),
+          new Date("2026-08-03T00:00:00Z"),
+          new Date("2026-07-31T23:59:59Z"), // before the window
+          new Date("2026-08-10T00:00:00Z"), // after the window
+        ],
+        since,
+        3,
+      );
+      expect(result).to.deep.equal([
+        { date: "2026-08-01", count: 2 },
+        { date: "2026-08-02", count: 0 },
+        { date: "2026-08-03", count: 1 },
+      ]);
+    });
+  });
+
+  describe("GET /admin/metrics", () => {
+    const app = createApp();
+
+    beforeEach(async () => {
+      await resetDatabase();
+    });
+
+    after(async () => {
+      await prisma.$disconnect();
+    });
+
+    it("rejects a request with no admin session with 401", async () => {
+      const res = await request(app).get("/admin/metrics");
+      expect(res.status).to.equal(401);
+    });
+
+    it("returns a snapshot reflecting seeded data, plus zero-filled series", async function () {
+      if (!adminSecretConfigured) {
+        // biome-ignore lint/suspicious/noExplicitAny: mocha's `this.skip()` isn't typed here.
+        (this as any).skip();
+        return;
+      }
+      const { email, password } = await seedAdmin();
+
+      // Two end users sign up (also emits `user.signup` analytics events).
+      const userA = request.agent(app);
+      const userB = request.agent(app);
+      await userA.post("/auth/signup").send(buildSignupPayload());
+      await userB.post("/auth/signup").send(buildSignupPayload());
+
+      const adminAgent = request.agent(app);
+      await adminAgent.post("/admin/auth/login").send({ email, password });
+
+      const res = await adminAgent.get("/admin/metrics").query({ days: 14 });
+      expect(res.status).to.equal(200);
+      expect(res.body.rangeDays).to.equal(14);
+      expect(res.body.snapshot.users).to.equal(2);
+      expect(res.body.snapshot.admins).to.equal(1);
+      expect(res.body.snapshot.recipes).to.equal(0);
+
+      // 14 daily buckets, each series zero-filled to that length.
+      expect(res.body.series.signups).to.have.length(14);
+      expect(
+        res.body.series.signups.every((b: { count: number }) => typeof b.count === "number"),
+      ).to.equal(true);
+      // Two signups today → the last bucket counts them.
+      const signupTotal = res.body.series.signups.reduce(
+        (sum: number, b: { count: number }) => sum + b.count,
+        0,
+      );
+      expect(signupTotal).to.equal(2);
+    });
+
+    it("records a user.signup analytics event (fire-and-forget, never blocks signup)", async () => {
+      const agent = request.agent(app);
+      const signupRes = await agent.post("/auth/signup").send(buildSignupPayload());
+      expect(signupRes.status).to.equal(201);
+
+      // `>= 1`, not `=== 1`: `recordEvent` is fire-and-forget, so an insert
+      // from an earlier test's signup could in principle land in this
+      // window too — the point here is that the instrumentation fires and
+      // the signup itself was never blocked by it.
+      await eventually(async () => {
+        const count = await prisma.analyticsEvent.count({ where: { type: "user.signup" } });
+        expect(count).to.be.greaterThan(0);
+      });
+    });
+  });
+});

docker-compose.yml

@@ -48,6 +48,15 @@ services:
       # default: `/internal/tech-steps/*` fails closed rather than open
       # for a deployment that doesn't run the worker at all.
       INTERNAL_WORKER_SECRET: ${INTERNAL_WORKER_SECRET:-}
+      # Admin application (apps/admin-web + /admin/*). Both unset by default:
+      # `requireAdmin` fails closed without ADMIN_JWT_SECRET, so a stack
+      # that doesn't run the admin app simply has every /admin/* route 401.
+      # Must be a *different* secret than JWT_SECRET.
+      ADMIN_JWT_SECRET: ${ADMIN_JWT_SECRET:-}
+      # Public origin apps/admin-web is served from, added to the CORS
+      # allow-list alongside the main app. Defaults to the compose
+      # `admin-web` service's mapped host port.
+      ADMIN_CORS_ORIGIN: ${ADMIN_CORS_ORIGIN:-http://localhost:3001}
       # Compose network service name, not localhost — same reasoning as
       # DATABASE_URL above. Unlike INTERNAL_WORKER_SECRET, no `:-` fallback:
       # tech-step-intent-service is a core dependency (see its own entry
@@ -128,6 +137,24 @@ services:
       # Dockerfile doc comment on its VOLUME declaration.
       - tech_step_llm_worker_models:/worker/models
 
+  # The admin application's frontend (apps/admin-web) — a static nginx image,
+  # entirely independent of `app` (its own build, its own URL). Talks to
+  # `app`'s /admin/* surface. Optional: a stack that doesn't need the admin
+  # app just omits this service. `VITE_ADMIN_API_URL` is baked in at build
+  # time — set it as a build arg when the admin app and the API sit on
+  # different public origins (default "" = same origin, for a shared proxy).
+  admin-web:
+    build:
+      context: .
+      dockerfile: apps/admin-web/Dockerfile
+      args:
+        VITE_ADMIN_API_URL: ${VITE_ADMIN_API_URL:-}
+    restart: unless-stopped
+    depends_on:
+      - app
+    ports:
+      - "${ADMIN_WEB_PORT:-3001}:80"
+
 volumes:
   postgres_data:
   tech_step_llm_worker_models:

packages/express-tools/src/express-server.ts

@@ -13,8 +13,14 @@ export type HttpMethod = "get" | "post" | "put" | "patch" | "delete";
 
 /** Options for {@link ExpressServer.setupCore}. */
 export interface ExpressServerCoreOptions {
-  /** Origin allowed by CORS — must match wherever the frontend is served from. */
-  corsOrigin: string;
+  /**
+   * Origin(s) allowed by CORS — a single origin, or a list when more than
+   * one frontend talks to this API from a different origin (e.g. the main
+   * app plus a separate admin app). Passed straight through to the `cors`
+   * package, which matches an incoming `Origin` against any entry of the
+   * list.
+   */
+  corsOrigin: string | string[];
 }
 
 /**

packages/shared/src/index.ts

@@ -7,6 +7,7 @@ export * from "./data/catalog-labels-en.js";
 export * from "./data/catalog-labels-fr.js";
 export * from "./errors/error-codes.js";
 export * from "./schemas/account.js";
+export * from "./schemas/admin.js";
 export * from "./schemas/auth.js";
 export * from "./schemas/household.js";
 export * from "./schemas/planning.js";
@@ -17,6 +18,7 @@ export * from "./schemas/shopping-list.js";
 export * from "./schemas/sources.js";
 export * from "./schemas/tech-step-worker.js";
 export * from "./tools/assert-is-never.js";
+export * from "./types/admin.js";
 export * from "./types/household.js";
 export * from "./types/planning.js";
 export * from "./types/preferences.js";

packages/shared/src/schemas/admin.ts

@@ -0,0 +1,30 @@
+import { z } from "zod";
+
+// Shared between apps/api (server-side validation, source of truth) and
+// apps/admin-web (client-side validation for instant feedback). Same
+// rationale as schemas/auth.ts — one set of rules, French messages surfaced
+// as-is in the admin login form.
+
+/**
+ * Payload accepted by `POST /admin/auth/login`. Deliberately its own schema
+ * (not a re-export of `loginSchema`): the admin surface is a separate
+ * contract from the end-user one even though the shape currently matches.
+ */
+export const adminLoginSchema = z.object({
+  email: z.string().trim().toLowerCase().email("Email invalide"),
+  password: z.string().min(1, "Le mot de passe est requis"),
+});
+/** Inferred TS type for {@link adminLoginSchema}'s validated output. */
+export type AdminLoginInput = z.infer<typeof adminLoginSchema>;
+
+/**
+ * Query params for `GET /admin/metrics` — `?days=` bounds how far back the
+ * time-series go (and how many daily buckets they carry). Coerced from the
+ * query string; clamped to a sane window so a huge value can't make the
+ * dashboard scan the whole history.
+ */
+export const getMetricsSchema = z.object({
+  days: z.coerce.number().int().min(7).max(365).default(30),
+});
+/** Inferred TS type for {@link getMetricsSchema}'s validated output. */
+export type GetMetricsInput = z.infer<typeof getMetricsSchema>;

packages/shared/src/types/admin.ts

@@ -0,0 +1,87 @@
+/**
+ * Public shape of an admin operator, as returned by `GET /admin/auth/me`
+ * and `POST /admin/auth/login` — never includes the password hash. Mirrors
+ * apps/api's `Omit<PrismaAdminUser, "passwordHash" | "tokenVersion">`,
+ * declared by hand rather than derived from the Prisma type (same reason as
+ * {@link SafeUserProfile}: apps/admin-web must not depend on
+ * `@prisma/client`). `createdAt`/`lastLoginAt` are ISO 8601 strings (JSON
+ * has no date type).
+ */
+export interface AdminUserView {
+  id: number;
+  email: string;
+  name: string;
+  createdAt: string;
+  lastLoginAt: string | null;
+}
+
+/** One `{ key, count }` breakdown row — e.g. recipes per source, corrections per status. */
+export interface MetricsBreakdownRow {
+  key: string;
+  /** Human-readable label when the key isn't self-explanatory (a source's display name); otherwise equal to `key`. */
+  label: string;
+  count: number;
+}
+
+/**
+ * Point-in-time totals for the admin dashboard's KPI tiles — every field is
+ * a `COUNT` against the current database, not a time series. See
+ * `apps/api`'s `admin-metrics.service.ts`.
+ */
+export interface MetricsSnapshotView {
+  admins: number;
+  users: number;
+  households: number;
+  /** Households with at least one `Planning` row. */
+  activeHouseholds: number;
+  recipes: number;
+  recipesManual: number;
+  recipesImported: number;
+  /** Imported recipes grouped by their `Source` (`key` = source key, `label` = display name). */
+  recipesBySource: MetricsBreakdownRow[];
+  plannings: number;
+  planningItems: number;
+  steps: number;
+  detectedTechniques: number;
+  favorites: number;
+  corrections: number;
+  /** Corrections not yet turned into a `TechStepTrainingSuggestion` (`consumedAt IS NULL`). */
+  correctionsUnconsumed: number;
+  /** Corrections that assert "no technique here" (`correctedTechStepId IS NULL`) — never become suggestions. */
+  correctionsRemoval: number;
+  trainingSuggestions: number;
+  trainingSuggestionsByStatus: MetricsBreakdownRow[];
+  trainingSuggestionsBySourceType: MetricsBreakdownRow[];
+}
+
+/** One day of a metrics time series. `date` is `YYYY-MM-DD` (UTC day). Days with no activity are present with `count: 0`. */
+export interface MetricsTimeBucket {
+  date: string;
+  count: number;
+}
+
+/** One instrumented `AnalyticsEvent` type, bucketed by day over the requested window. */
+export interface MetricsEventSeries {
+  type: string;
+  buckets: MetricsTimeBucket[];
+}
+
+/**
+ * Response of `GET /admin/metrics`. `snapshot` is "right now"; `series` and
+ * `events` cover the last `rangeDays` days as daily buckets (zero-filled).
+ * `series` is derived from the `createdAt` columns added by the
+ * `admin_metrics` migration; `events` from the `AnalyticsEvent` table.
+ */
+export interface MetricsView {
+  generatedAt: string;
+  rangeDays: number;
+  snapshot: MetricsSnapshotView;
+  series: {
+    signups: MetricsTimeBucket[];
+    recipesCreated: MetricsTimeBucket[];
+    planningItemsAdded: MetricsTimeBucket[];
+    correctionsSubmitted: MetricsTimeBucket[];
+    trainingSuggestions: MetricsTimeBucket[];
+  };
+  events: MetricsEventSeries[];
+}

pnpm-lock.yaml

@@ -15,6 +15,79 @@ importers:
         specifier: ^5.7.2
         version: 5.9.3
 
+  apps/admin-web:
+    dependencies:
+      '@batch-cooking/date-tools':
+        specifier: workspace:*
+        version: link:../../packages/date-tools
+      '@batch-cooking/shared':
+        specifier: workspace:*
+        version: link:../../packages/shared
+      i18next:
+        specifier: ^26.3.6
+        version: 26.3.6(typescript@5.9.3)
+      lucide-react:
+        specifier: ^1.32.0
+        version: 1.32.0(react@18.3.1)
+      react:
+        specifier: ^18.3.1
+        version: 18.3.1
+      react-dom:
+        specifier: ^18.3.1
+        version: 18.3.1(react@18.3.1)
+      react-i18next:
+        specifier: ^17.0.11
+        version: 17.0.11(i18next@26.3.6(typescript@5.9.3))(react-dom@18.3.1(react@18.3.1))(react@18.3.1)(typescript@5.9.3)
+      react-router-dom:
+        specifier: ^7.18.2
+        version: 7.18.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
+      recharts:
+        specifier: ^2.15.0
+        version: 2.15.4(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
+      zod:
+        specifier: ^3.25.76
+        version: 3.25.76
+    devDependencies:
+      '@badeball/cypress-cucumber-preprocessor':
+        specifier: 22.2.0
+        version: 22.2.0(@babel/core@7.29.7)(cypress@13.17.0)(typescript@5.9.3)
+      '@bahmutov/cypress-esbuild-preprocessor':
+        specifier: 2.2.8
+        version: 2.2.8(esbuild@0.21.5)
+      '@cypress/vite-dev-server':
+        specifier: 5.2.1
+        version: 5.2.1
+      '@types/node':
+        specifier: ^22.9.0
+        version: 22.20.1
+      '@types/react':
+        specifier: ^18.3.12
+        version: 18.3.31
+      '@types/react-dom':
+        specifier: ^18.3.1
+        version: 18.3.7(@types/react@18.3.31)
+      '@vitejs/plugin-react':
+        specifier: ^4.3.3
+        version: 4.7.0(vite@5.4.21(@types/node@22.20.1)(sass@1.102.0))
+      cypress:
+        specifier: 13.17.0
+        version: 13.17.0
+      esbuild:
+        specifier: 0.21.5
+        version: 0.21.5
+      sass:
+        specifier: ^1.102.0
+        version: 1.102.0
+      start-server-and-test:
+        specifier: ^2.0.8
+        version: 2.1.5
+      typescript:
+        specifier: ^5.7.2
+        version: 5.9.3
+      vite:
+        specifier: ^5.4.11
+        version: 5.4.21(@types/node@22.20.1)(sass@1.102.0)
+
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     dependencies:
       '@batch-cooking/date-tools':
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+
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+
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+    resolution: {integrity: sha512-mgLPETlrpVV1YRJIglr4Ez47g7Yxjl1lj7YKsiMCb27VJH9W8NVM6Bb9d8kkpG/uAQS5AmbA48q2IAolKKo1MA==, tarball: https://registry.npmjs.org/@types/d3-interpolate/-/d3-interpolate-3.0.4.tgz}
+
+  '@types/d3-path@3.1.1':
+    resolution: {integrity: sha512-VMZBYyQvbGmWyWVea0EHs/BwLgxc+MKi1zLDCONksozI4YJMcTt8ZEuIR4Sb1MMTE8MMW49v0IwI5+b7RmfWlg==, tarball: https://registry.npmjs.org/@types/d3-path/-/d3-path-3.1.1.tgz}
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+  '@types/d3-scale@4.0.9':
+    resolution: {integrity: sha512-dLmtwB8zkAeO/juAMfnV+sItKjlsw2lKdZVVy6LRr0cBmegxSABiLEpGVmSJJ8O08i4+sGR6qQtb6WtuwJdvVw==, tarball: https://registry.npmjs.org/@types/d3-scale/-/d3-scale-4.0.9.tgz}
+
+  '@types/d3-shape@3.2.0':
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+
+  '@types/d3-time@3.0.4':
+    resolution: {integrity: sha512-yuzZug1nkAAaBlBBikKZTgzCeA+k1uy4ZFwWANOfKw5z5LRhV0gNA7gNkKm7HoK+HRN0wX3EkxGk0fpbWhmB7g==, tarball: https://registry.npmjs.org/@types/d3-time/-/d3-time-3.0.4.tgz}
+
+  '@types/d3-timer@3.0.2':
+    resolution: {integrity: sha512-Ps3T8E8dZDam6fUyNiMkekK3XUsaUEik+idO9/YjPtfj2qruF8tFBXS7XhtE4iIXBLxhmLjP3SXpLhVf21I9Lw==, tarball: https://registry.npmjs.org/@types/d3-timer/-/d3-timer-3.0.2.tgz}
+
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     resolution: {integrity: sha512-GhdPgy1el4/ImP05X05Uw4cw2/M93BCUmnEvWZNStlCzEKME4Fkk+YpoA5OiHNQmoS7Cafb8Xa3Pya8m1Qrzeg==, tarball: https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz}
 
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     engines: {node: '>=0.8'}
 
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+    engines: {node: '>=6'}
+
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@@ -1727,6 +1831,50 @@ packages:
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+  d3-array@3.2.4:
+    resolution: {integrity: sha512-tdQAmyA18i4J7wprpYq8ClcxZy3SC31QMeByyCFyRt7BVHdREQZ5lpzoe5mFEYZUWe+oq8HBvk9JjpibyEV4Jg==, tarball: https://registry.npmjs.org/d3-array/-/d3-array-3.2.4.tgz}
+    engines: {node: '>=12'}
+
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+    engines: {node: '>=12'}
+
+  d3-ease@3.0.1:
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+    engines: {node: '>=12'}
+
+  d3-format@3.1.2:
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+    engines: {node: '>=12'}
+
+  d3-interpolate@3.0.1:
+    resolution: {integrity: sha512-3bYs1rOD33uo8aqJfKP3JWPAibgw8Zm2+L9vBKEHJ2Rg+viTR7o5Mmv5mZcieN+FRYaAOWX5SJATX6k1PWz72g==, tarball: https://registry.npmjs.org/d3-interpolate/-/d3-interpolate-3.0.1.tgz}
+    engines: {node: '>=12'}
+
+  d3-path@3.1.0:
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+    engines: {node: '>=12'}
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+  d3-scale@4.0.2:
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+    engines: {node: '>=12'}
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+    engines: {node: '>=12'}
+
+  d3-time-format@4.1.0:
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+    engines: {node: '>=12'}
+
+  d3-time@3.1.0:
+    resolution: {integrity: sha512-VqKjzBLejbSMT4IgbmVgDjpkYrNWUYJnbCGo874u7MMKIWsILRX+OpX/gTk8MqjpT1A/c6HY2dCA77ZN0lkQ2Q==, tarball: https://registry.npmjs.org/d3-time/-/d3-time-3.1.0.tgz}
+    engines: {node: '>=12'}
+
+  d3-timer@3.0.1:
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+    engines: {node: '>=12'}
+
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     engines: {node: '>=10'}
 
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+
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     engines: {node: '>=0.3.1'}
 
+  dom-helpers@5.2.1:
+    resolution: {integrity: sha512-nRCa7CK3VTrM2NmGkIy4cbK7IZlgBE/PYMn55rrXefr5xXDP0LdtfPnblFDoVdcAfslJ7or6iqAUnx0CCGIWQA==, tarball: https://registry.npmjs.org/dom-helpers/-/dom-helpers-5.2.1.tgz}
+
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     resolution: {integrity: sha512-VHwB3KfrcOOkelEG2ZOfxqLZdfkil8PtJi4P8N2MMXucZq2yLp75ClViUlOVwyoHEDjYU433Aq+5zWP61+RGag==, tarball: https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.4.1.tgz}
 
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+  eventemitter3@4.0.7:
+    resolution: {integrity: sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==, tarball: https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz}
+
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@@ -2060,6 +2217,10 @@ packages:
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     engines: {'0': node >=0.6.0}
 
+  fast-equals@5.4.1:
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+    engines: {node: '>=6.0.0'}
+
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     engines: {node: '>= 0.4'}
 
+  internmap@2.0.3:
+    resolution: {integrity: sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg==, tarball: https://registry.npmjs.org/internmap/-/internmap-2.0.3.tgz}
+    engines: {node: '>=12'}
+
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@@ -3025,6 +3190,9 @@ packages:
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     engines: {node: '>=0.4.0'}
 
+  prop-types@15.8.1:
+    resolution: {integrity: sha512-oj87CgZICdulUohogVAR7AjlC0327U4el4L6eAvOqCeudMDVU0NThNaV+b9Df4dXgSP1gXMTnPdhfe/2qDH5cg==, tarball: https://registry.npmjs.org/prop-types/-/prop-types-15.8.1.tgz}
+
   property-expr@2.0.6:
     resolution: {integrity: sha512-SVtmxhRE/CGkn3eZY1T6pC8Nln6Fr/lu1mKSgRud0eC73whjGfoAogbn78LkD8aFL0zz3bAFerKSnOl7NlErBA==, tarball: https://registry.npmjs.org/property-expr/-/property-expr-2.0.6.tgz}
 
@@ -3093,6 +3261,12 @@ packages:
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+  react-is@16.13.1:
+    resolution: {integrity: sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==, tarball: https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz}
+
+  react-is@18.3.1:
+    resolution: {integrity: sha512-/LLMVyas0ljjAtoYiPqYiL8VWXzUUdThrmU5+n20DZv+a+ClRoevUzw5JxU+Ieh5/c87ytoTBV9G1FiKfNJdmg==, tarball: https://registry.npmjs.org/react-is/-/react-is-18.3.1.tgz}
+
   react-refresh@0.17.0:
     resolution: {integrity: sha512-z6F7K9bV85EfseRCp2bzrpyQ0Gkw1uLoCel9XBVWPg/TjRj94SkJzUTGfOa4bs7iJvBWtQG0Wq7wnI0syw3EBQ==, tarball: https://registry.npmjs.org/react-refresh/-/react-refresh-0.17.0.tgz}
     engines: {node: '>=0.10.0'}
@@ -3114,6 +3288,18 @@ packages:
       react-dom:
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+  react-smooth@4.0.4:
+    resolution: {integrity: sha512-gnGKTpYwqL0Iii09gHobNolvX4Kiq4PKx6eWBCYYix+8cdw+cGo3do906l1NBPKkSWx1DghC1dlWG9L2uGd61Q==, tarball: https://registry.npmjs.org/react-smooth/-/react-smooth-4.0.4.tgz}
+    peerDependencies:
+      react: ^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
+      react-dom: ^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
+
+  react-transition-group@4.4.5:
+    resolution: {integrity: sha512-pZcd1MCJoiKiBR2NRxeCRg13uCXbydPnmB4EOeRrY7480qNWO8IIgQG6zlDkm6uRMsURXPuKq0GWtiM59a5Q6g==, tarball: https://registry.npmjs.org/react-transition-group/-/react-transition-group-4.4.5.tgz}
+    peerDependencies:
+      react: '>=16.6.0'
+      react-dom: '>=16.6.0'
+
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     resolution: {integrity: sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==, tarball: https://registry.npmjs.org/react/-/react-18.3.1.tgz}
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@@ -3142,6 +3328,17 @@ packages:
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     engines: {node: '>= 20.19.0'}
 
+  recharts-scale@0.4.5:
+    resolution: {integrity: sha512-kivNFO+0OcUNu7jQquLXAxz1FIwZj8nrj+YkOKc5694NbjCvcT6aSZiIzNzd2Kul4o4rTto8QVR9lMNtxD4G1w==, tarball: https://registry.npmjs.org/recharts-scale/-/recharts-scale-0.4.5.tgz}
+
+  recharts@2.15.4:
+    resolution: {integrity: sha512-UT/q6fwS3c1dHbXv2uFgYJ9BMFHu3fwnd7AYZaEQhXuYQ4hgsxLvsUXzGdKeZrW5xopzDCvuA2N41WJ88I7zIw==, tarball: https://registry.npmjs.org/recharts/-/recharts-2.15.4.tgz}
+    engines: {node: '>=14'}
+    deprecated: 1.x and 2.x branches are no longer active. Bump to Recharts v3 to receive latest features and bugfixes. See https://github.com/recharts/recharts/wiki/3.0-migration-guide
+    peerDependencies:
+      react: ^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
+      react-dom: ^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
+
   reflect-metadata@0.2.2:
     resolution: {integrity: sha512-urBwgfrvVP/eAyXx4hluJivBKzuEbSQs9rKWCrCkbSxNv8mxPcUZKeuoF3Uy4mJl3Lwprp6yy5/39VWigZ4K6Q==, tarball: https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.2.2.tgz}
 
@@ -3484,6 +3681,9 @@ packages:
   tiny-case@1.0.3:
     resolution: {integrity: sha512-Eet/eeMhkO6TX8mnUteS9zgPbUMQa4I6Kkp5ORiBD5476/m+PIRiumP5tmh5ioJpH7k51Kehawy2UDfsnxxY8Q==, tarball: https://registry.npmjs.org/tiny-case/-/tiny-case-1.0.3.tgz}
 
+  tiny-invariant@1.3.3:
+    resolution: {integrity: sha512-+FbBPE1o9QAYvviau/qC5SE3caw21q3xkvWKBtja5vgqOWIHHJ3ioaq1VPfn/Szqctz2bU/oYeKd9/z5BL+PVg==, tarball: https://registry.npmjs.org/tiny-invariant/-/tiny-invariant-1.3.3.tgz}
+
   tinyglobby@0.2.17:
     resolution: {integrity: sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==, tarball: https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz}
     engines: {node: '>=12.0.0'}
@@ -3646,6 +3846,9 @@ packages:
     resolution: {integrity: sha512-ZZKSmDAEFOijERBLkmYfJ+vmk3w+7hOLYDNkRCuRuMJGEmqYNCNLyBBFwWKVMhfwaEF3WOd0Zlw86U/WC/+nYw==, tarball: https://registry.npmjs.org/verror/-/verror-1.10.0.tgz}
     engines: {'0': node >=0.6.0}
 
+  victory-vendor@36.9.2:
+    resolution: {integrity: sha512-PnpQQMuxlwYdocC8fIJqVXvkeViHYzotI+NJrCuav0ZYFoq912ZHBk3mCeuj+5/VpodOjPe1z0Fk2ihgzlXqjQ==, tarball: https://registry.npmjs.org/victory-vendor/-/victory-vendor-36.9.2.tgz}
+
   vite@5.4.21:
     resolution: {integrity: sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==, tarball: https://registry.npmjs.org/vite/-/vite-5.4.21.tgz}
     engines: {node: ^18.0.0 || >=20.0.0}
@@ -4622,6 +4825,30 @@ snapshots:
     dependencies:
       '@types/node': 22.20.1
 
+  '@types/d3-array@3.2.2': {}
+
+  '@types/d3-color@3.1.3': {}
+
+  '@types/d3-ease@3.0.2': {}
+
+  '@types/d3-interpolate@3.0.4':
+    dependencies:
+      '@types/d3-color': 3.1.3
+
+  '@types/d3-path@3.1.1': {}
+
+  '@types/d3-scale@4.0.9':
+    dependencies:
+      '@types/d3-time': 3.0.4
+
+  '@types/d3-shape@3.2.0':
+    dependencies:
+      '@types/d3-path': 3.1.1
+
+  '@types/d3-time@3.0.4': {}
+
+  '@types/d3-timer@3.0.2': {}
+
   '@types/estree@1.0.9': {}
 
   '@types/express-serve-static-core@4.19.9':
@@ -5106,6 +5333,8 @@ snapshots:
   clone@1.0.4:
     optional: true
 
+  clsx@2.1.1: {}
+
   color-convert@2.0.1:
     dependencies:
       color-name: 1.1.4
@@ -5256,6 +5485,44 @@ snapshots:
       untildify: 4.0.0
       yauzl: 2.10.0
 
+  d3-array@3.2.4:
+    dependencies:
+      internmap: 2.0.3
+
+  d3-color@3.1.0: {}
+
+  d3-ease@3.0.1: {}
+
+  d3-format@3.1.2: {}
+
+  d3-interpolate@3.0.1:
+    dependencies:
+      d3-color: 3.1.0
+
+  d3-path@3.1.0: {}
+
+  d3-scale@4.0.2:
+    dependencies:
+      d3-array: 3.2.4
+      d3-format: 3.1.2
+      d3-interpolate: 3.0.1
+      d3-time: 3.1.0
+      d3-time-format: 4.1.0
+
+  d3-shape@3.2.0:
+    dependencies:
+      d3-path: 3.1.0
+
+  d3-time-format@4.1.0:
+    dependencies:
+      d3-time: 3.1.0
+
+  d3-time@3.1.0:
+    dependencies:
+      d3-array: 3.2.4
+
+  d3-timer@3.0.1: {}
+
   dashdash@1.14.1:
     dependencies:
       assert-plus: 1.0.0
@@ -5284,6 +5551,8 @@ snapshots:
 
   decamelize@4.0.0: {}
 
+  decimal.js-light@2.5.1: {}
+
   deep-eql@5.0.2: {}
 
   deep-equal@2.2.3:
@@ -5411,6 +5680,11 @@ snapshots:
 
   diff@7.0.0: {}
 
+  dom-helpers@5.2.1:
+    dependencies:
+      '@babel/runtime': 7.29.7
+      csstype: 3.2.3
+
   dom-serializer@1.4.1:
     dependencies:
       domelementtype: 2.3.0
@@ -5614,6 +5888,8 @@ snapshots:
 
   eventemitter2@6.4.7: {}
 
+  eventemitter3@4.0.7: {}
+
   execa@4.1.0:
     dependencies:
       cross-spawn: 7.0.6
@@ -5692,6 +5968,8 @@ snapshots:
 
   extsprintf@1.3.0: {}
 
+  fast-equals@5.4.1: {}
+
   fast-glob@3.3.3:
     dependencies:
       '@nodelib/fs.stat': 2.0.5
@@ -6037,6 +6315,8 @@ snapshots:
       hasown: 2.0.4
       side-channel: 1.1.1
 
+  internmap@2.0.3: {}
+
   ipaddr.js@1.9.1: {}
 
   is-arguments@1.2.0:
@@ -6673,6 +6953,12 @@ snapshots:
 
   progress@2.0.3: {}
 
+  prop-types@15.8.1:
+    dependencies:
+      loose-envify: 1.4.0
+      object-assign: 4.1.1
+      react-is: 16.13.1
+
   property-expr@2.0.6: {}
 
   proxy-addr@2.0.7:
@@ -6736,6 +7022,10 @@ snapshots:
       react-dom: 18.3.1(react@18.3.1)
       typescript: 5.9.3
 
+  react-is@16.13.1: {}
+
+  react-is@18.3.1: {}
+
   react-refresh@0.17.0: {}
 
   react-router-dom@7.18.2(react-dom@18.3.1(react@18.3.1))(react@18.3.1):
@@ -6752,6 +7042,23 @@ snapshots:
     optionalDependencies:
       react-dom: 18.3.1(react@18.3.1)
 
+  react-smooth@4.0.4(react-dom@18.3.1(react@18.3.1))(react@18.3.1):
+    dependencies:
+      fast-equals: 5.4.1
+      prop-types: 15.8.1
+      react: 18.3.1
+      react-dom: 18.3.1(react@18.3.1)
+      react-transition-group: 4.4.5(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
+
+  react-transition-group@4.4.5(react-dom@18.3.1(react@18.3.1))(react@18.3.1):
+    dependencies:
+      '@babel/runtime': 7.29.7
+      dom-helpers: 5.2.1
+      loose-envify: 1.4.0
+      prop-types: 15.8.1
+      react: 18.3.1
+      react-dom: 18.3.1(react@18.3.1)
+
   react@18.3.1:
     dependencies:
       loose-envify: 1.4.0
@@ -6784,6 +7091,23 @@ snapshots:
 
   readdirp@5.1.1: {}
 
+  recharts-scale@0.4.5:
+    dependencies:
+      decimal.js-light: 2.5.1
+
+  recharts@2.15.4(react-dom@18.3.1(react@18.3.1))(react@18.3.1):
+    dependencies:
+      clsx: 2.1.1
+      eventemitter3: 4.0.7
+      lodash: 4.18.1
+      react: 18.3.1
+      react-dom: 18.3.1(react@18.3.1)
+      react-is: 18.3.1
+      react-smooth: 4.0.4(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
+      recharts-scale: 0.4.5
+      tiny-invariant: 1.3.3
+      victory-vendor: 36.9.2
+
   reflect-metadata@0.2.2: {}
 
   regexp-match-indices@1.0.2:
@@ -7212,6 +7536,8 @@ snapshots:
 
   tiny-case@1.0.3: {}
 
+  tiny-invariant@1.3.3: {}
+
   tinyglobby@0.2.17:
     dependencies:
       fdir: 6.5.0(picomatch@4.0.5)
@@ -7333,6 +7659,23 @@ snapshots:
       core-util-is: 1.0.2
       extsprintf: 1.3.0
 
+  victory-vendor@36.9.2:
+    dependencies:
+      '@types/d3-array': 3.2.2
+      '@types/d3-ease': 3.0.2
+      '@types/d3-interpolate': 3.0.4
+      '@types/d3-scale': 4.0.9
+      '@types/d3-shape': 3.2.0
+      '@types/d3-time': 3.0.4
+      '@types/d3-timer': 3.0.2
+      d3-array: 3.2.4
+      d3-ease: 3.0.1
+      d3-interpolate: 3.0.1
+      d3-scale: 4.0.2
+      d3-shape: 3.2.0
+      d3-time: 3.1.0
+      d3-timer: 3.0.1
+
   vite@5.4.21(@types/node@22.20.1)(sass@1.102.0):
     dependencies:
       esbuild: 0.21.5

specs/backend-architecture.md

@@ -296,6 +296,51 @@ telles quelles par typage structurel.
 
 ---
 
+## `admin` — application d'administration (`/admin/*`)
+
+Surface d'exploitation servie à `apps/admin-web` (frontend Vite **séparé**,
+URL/déploiement propres). Vit dans `apps/api` (qui reste seul propriétaire du
+schéma) mais avec une **authentification totalement distincte** de celle des
+utilisateurs.
+
+**Auth** (`middlewares/require-admin.ts`, `lib/admin-jwt.ts`) — table
+`AdminUser` isolée (aucune relation vers `UserProfile`), cookie
+`ADMIN_COOKIE_NAME` (`admin_session`, ≠ `session`), secret `ADMIN_JWT_SECRET`
+(≠ `JWT_SECRET`). `requireAdmin` re-check `tokenVersion` en base comme
+`requireAuth`, **échoue fermé** si `ADMIN_JWT_SECRET` est absent (posture
+`requireInternalWorker`). Aucun signup exposé — le 1ᵉʳ admin est créé
+hors-bande par `src/scripts/create-admin.ts` (flags ou `ADMIN_INITIAL_*`).
+`res.locals.adminUser` typé `AdminLocals`. CORS : `setupCore` accepte
+`string[]`, `app.ts` autorise `CORS_ORIGIN` + `ADMIN_CORS_ORIGIN`.
+
+Router agrégateur `modules/admin/admin.routes.ts` monté `/admin` :
+`/admin/auth` (`login`/`logout`/`me`), `/admin/metrics` (ci-dessous).
+
+**Métriques** (`admin-metrics.service.ts`, `GET /admin/metrics?days=` 7–365,
+défaut 30) — `MetricsView` = `snapshot` (des `count`s : utilisateurs, foyers,
+foyers actifs, recettes manuelles/importées + ventilation par source,
+plannings, créneaux, corrections par état, suggestions par statut/source…) +
+`series` (buckets journaliers zéro-remplis) + `events` (rollup
+`AnalyticsEvent` par type/jour). Les séries sont dérivées de colonnes
+`createdAt` ajoutées par la migration `admin_metrics` à `UserProfile` /
+`Recipe` / `Planning` / `PlanningItem` (aucun code applicatif ne les lit ;
+lignes préexistantes = timestamp de la migration). `bucketByDay` est
+pur/testable sans base.
+
+**Instrumentation** (`lib/analytics.service.ts`) — `analytics.recordEvent(type, { actorId?, context? })`
+**fire-and-forget** : retourne `void`, insère détaché, un échec est loggué
+`warn` et avalé (jamais de latence ni d'échec sur la requête appelante). `type`
+est un `String` libre (`"user.signup"`, `"recipe.imported"`, `"recipe.created"`,
+`"planning.item_added"`, `"tech_step.correction_submitted"`,
+`"shopping_list.viewed"` aujourd'hui) — ajouter un évènement = un appel d'une
+ligne, **sans migration**. `AnalyticsEvent.actorId` n'a **pas** de FK (un
+évènement est un fait historique qui survit au compte qu'il décrit).
+
+*(La table `WorkerHeartbeat` est créée par la même migration mais n'est
+câblée que par le monitoring — section à venir.)*
+
+---
+
 ## `reference` — catalogues publics (pas de session requise)
 
 Router `/reference` (`reference.routes.ts`/`.service.ts`) — **toutes les