diff --git a/apps/api/app/controllers/dashboard_controller.ts b/apps/api/app/controllers/dashboard_controller.ts
new file mode 100644
index 0000000..e535bfb
--- /dev/null
+++ b/apps/api/app/controllers/dashboard_controller.ts
@@ -0,0 +1,65 @@
+import ActivityEvent from '#models/activity_event'
+import { computeKpis, topLatePayers } from '#services/dashboard'
+import type { HttpContext } from '@adonisjs/core/http'
+import { Exception } from '@adonisjs/core/exceptions'
+
+const ACTIVITY_DEFAULT_LIMIT = 20
+
+function requireOrgId(auth: HttpContext['auth']): string {
+  const user = auth.getUserOrFail()
+  if (!user.organizationId) {
+    throw new Exception('Aucune organisation rattachée', { status: 404, code: 'not_found' })
+  }
+  return user.organizationId
+}
+
+export default class DashboardController {
+  /**
+   * GET /dashboard/kpis
+   *
+   * Cf. service dashboard.ts — quelques metrics V1 sont placeholder
+   * (miseEnDemeurePending=0 tant que RelanceTask pas branché, percentile
+   * undefined tant que cohorte trop petite).
+   */
+  async kpis({ auth, response }: HttpContext) {
+    const organizationId = requireOrgId(auth)
+    const data = await computeKpis(organizationId)
+    return response.json({ data })
+  }
+
+  /**
+   * GET /dashboard/activity
+   *
+   * Journal append-only. Limit 20 par défaut, plus récent en tête.
+   */
+  async activity({ auth, response }: HttpContext) {
+    const organizationId = requireOrgId(auth)
+
+    const events = await ActivityEvent.query()
+      .where('organization_id', organizationId)
+      .orderBy('at', 'desc')
+      .limit(ACTIVITY_DEFAULT_LIMIT)
+
+    return response.json({
+      data: events.map((e) => ({
+        id: e.id,
+        kind: e.kind,
+        at: e.at.toISO()!,
+        label: e.label,
+        meta: e.meta,
+      })),
+    })
+  }
+
+  /**
+   * GET /dashboard/top-late
+   *
+   * Top 5 clients avec le plus de factures en retard (status actif +
+   * due_date dépassée).
+   */
+  async topLate({ auth, response }: HttpContext) {
+    const organizationId = requireOrgId(auth)
+    const data = await topLatePayers(organizationId)
+    return response.json({ data })
+  }
+}
diff --git a/apps/api/app/controllers/import_batches_controller.ts b/apps/api/app/controllers/import_batches_controller.ts
index 0e53891..f0515a6 100644
--- a/apps/api/app/controllers/import_batches_controller.ts
+++ b/apps/api/app/controllers/import_batches_controller.ts
@@ -11,6 +11,7 @@ import {
 } from '#validators/import_batch'
 import { resolveClient } from '#services/resolve_client'
 import { createImportBatchFromFilenames } from '#services/import_batch'
+import { recordActivity } from '#services/activity_recorder'
 import type { HttpContext } from '@adonisjs/core/http'
 import { Exception } from '@adonisjs/core/exceptions'
 import db from '@adonisjs/lucid/services/db'
@@ -151,6 +152,14 @@ export default class ImportBatchesController {
       draft.invoiceId = created.id
       await draft.save()
 
+      await recordActivity({
+        organizationId,
+        kind: 'invoice_imported',
+        label: `Facture <b>${created.numero}</b> importée et validée`,
+        meta: { invoiceId: created.id, clientId: client.id },
+        trx,
+      })
+
       return created
     })
 
diff --git a/apps/api/app/controllers/invoices_controller.ts b/apps/api/app/controllers/invoices_controller.ts
index f9f7abc..8e58481 100644
--- a/apps/api/app/controllers/invoices_controller.ts
+++ b/apps/api/app/controllers/invoices_controller.ts
@@ -10,6 +10,7 @@ import { Exception } from '@adonisjs/core/exceptions'
 import db from '@adonisjs/lucid/services/db'
 import { DateTime } from 'luxon'
 import { resolveClient } from '#services/resolve_client'
+import { recordActivity } from '#services/activity_recorder'
 
 const PAGE_SIZE = 50
 
@@ -333,6 +334,15 @@ export default class InvoicesController {
         .from('organizations')
         .where('id', organizationId)
         .increment('rubis_count', 1)
+
+      // Journal d'activité (cf. dashboard activity feed).
+      await recordActivity({
+        organizationId,
+        kind: 'invoice_paid',
+        label: `Facture <b>${invoice.numero}</b> marquée encaissée`,
+        meta: { invoiceId: invoice.id, clientId: invoice.clientId },
+        trx,
+      })
     })
 
     return response.json({ data: serializeInvoice(invoice) })
diff --git a/apps/api/app/models/activity_event.ts b/apps/api/app/models/activity_event.ts
new file mode 100644
index 0000000..5606b8e
--- /dev/null
+++ b/apps/api/app/models/activity_event.ts
@@ -0,0 +1,9 @@
+import { ActivityEventSchema } from '#database/schema'
+import { belongsTo } from '@adonisjs/lucid/orm'
+import type { BelongsTo } from '@adonisjs/lucid/types/relations'
+import Organization from '#models/organization'
+
+export default class ActivityEvent extends ActivityEventSchema {
+  @belongsTo(() => Organization)
+  declare organization: BelongsTo<typeof Organization>
+}
diff --git a/apps/api/app/services/activity_recorder.ts b/apps/api/app/services/activity_recorder.ts
new file mode 100644
index 0000000..cb395d4
--- /dev/null
+++ b/apps/api/app/services/activity_recorder.ts
@@ -0,0 +1,40 @@
+import { DateTime } from 'luxon'
+import ActivityEvent from '#models/activity_event'
+import type { TransactionClientContract } from '@adonisjs/lucid/types/database'
+
+type EventKind = 'relance_sent' | 'invoice_paid' | 'invoice_imported' | 'warning_drafted'
+
+type RecordOpts = {
+  organizationId: string
+  kind: EventKind
+  label: string
+  meta?: Record<string, unknown>
+  at?: DateTime
+  trx?: TransactionClientContract
+}
+
+/**
+ * Enregistre un événement dans le journal d'activité (append-only).
+ * Appelé depuis :
+ *  - SendRelanceJob (relance_sent)
+ *  - InvoicesController.markPaid (invoice_paid)
+ *  - ImportBatchesController.validateDraft (invoice_imported)
+ *  - SendRelanceJob quand step.requires_manual_validation (warning_drafted)
+ *
+ * Les labels acceptent un HTML léger (<b>) pour permettre au SPA de
+ * mettre en gras les noms d'entité — toujours composé côté serveur,
+ * jamais d'input utilisateur brut.
+ */
+export async function recordActivity(opts: RecordOpts): Promise<ActivityEvent> {
+  const { organizationId, kind, label, meta = {}, at, trx } = opts
+  return ActivityEvent.create(
+    {
+      organizationId,
+      kind,
+      label,
+      meta,
+      at: at ?? DateTime.now(),
+    },
+    trx ? { client: trx } : undefined
+  )
+}
diff --git a/apps/api/app/services/dashboard.ts b/apps/api/app/services/dashboard.ts
new file mode 100644
index 0000000..30b79e1
--- /dev/null
+++ b/apps/api/app/services/dashboard.ts
@@ -0,0 +1,150 @@
+import db from '@adonisjs/lucid/services/db'
+import Organization from '#models/organization'
+import { DateTime } from 'luxon'
+
+const ACTIVE_INVOICE_STATUSES = "('pending','in_relance','awaiting_user_confirmation')"
+
+export type DashboardKpis = {
+  rubisCount: number
+  rubisThisMonth: number
+  // 1 rubis = 10 minutes libérées (cf. CLAUDE.md → glossaire)
+  hoursLiberatedThisMonth: number
+  encaisseCents: number
+  encaisseDeltaCents: number
+  dsoDays: number
+  dsoDeltaDays: number
+  factureToRelance: number
+  factureInRelance: number
+  factureNewToday: number
+  miseEnDemeurePending: number
+  monthlyGoalProgress: number
+  // Rang relatif à la cohorte (placeholder V1, calculé en V2 avec assez de data)
+  percentile?: number
+}
+
+function startOfMonth(d: DateTime): Date {
+  return d.startOf('month').toJSDate()
+}
+
+function startOfDay(d: DateTime): Date {
+  return d.startOf('day').toJSDate()
+}
+
+/**
+ * Calcule les KPIs dashboard pour une organisation.
+ *
+ * V1 — implémentation simple sans cache. Quelques metrics avancés
+ * (DSO, percentile) sont à 0 ou null tant qu'on a pas assez d'historique.
+ * Le contrat reste stable côté SPA.
+ */
+export async function computeKpis(organizationId: string): Promise<DashboardKpis> {
+  const now = DateTime.now()
+  const monthStart = startOfMonth(now)
+  const todayStart = startOfDay(now)
+  const prevMonthStart = startOfMonth(now.minus({ months: 1 }))
+
+  const org = await Organization.findOrFail(organizationId)
+
+  // Counts par statut + factures récentes
+  const counts = (await db
+    .from('invoices')
+    .where('organization_id', organizationId)
+    .select(
+      db.raw(`count(*) filter (where status = 'pending')::int as to_relance`),
+      db.raw(`count(*) filter (where status = 'in_relance')::int as in_relance`),
+      db.raw(`count(*) filter (where created_at >= ?)::int as new_today`, [todayStart])
+    )
+    .first()) as { to_relance: number; in_relance: number; new_today: number } | undefined
+
+  // Sommes d'encaissement (paid_at) ce mois et le précédent
+  const paidStats = (await db
+    .from('invoices')
+    .where('organization_id', organizationId)
+    .where('status', 'paid')
+    .select(
+      db.raw(
+        `coalesce(sum(amount_ttc_cents) filter (where paid_at >= ?), 0)::int as this_month`,
+        [monthStart]
+      ),
+      db.raw(
+        `coalesce(sum(amount_ttc_cents) filter (where paid_at >= ? and paid_at < ?), 0)::int as prev_month`,
+        [prevMonthStart, monthStart]
+      ),
+      db.raw(
+        `coalesce(sum(rubis_earned) filter (where paid_at >= ?), 0)::int as rubis_this_month`,
+        [monthStart]
+      ),
+      db.raw(
+        `coalesce(avg(extract(epoch from (paid_at - issue_date)) / 86400) filter (where paid_at >= ?), 0)::int as dso_this_month`,
+        [monthStart]
+      ),
+      db.raw(
+        `coalesce(avg(extract(epoch from (paid_at - issue_date)) / 86400) filter (where paid_at >= ? and paid_at < ?), 0)::int as dso_prev_month`,
+        [prevMonthStart, monthStart]
+      )
+    )
+    .first()) as
+    | {
+        this_month: number
+        prev_month: number
+        rubis_this_month: number
+        dso_this_month: number
+        dso_prev_month: number
+      }
+    | undefined
+
+  const encaisseCents = paidStats?.this_month ?? 0
+  const encaisseDeltaCents = encaisseCents - (paidStats?.prev_month ?? 0)
+  const rubisThisMonth = paidStats?.rubis_this_month ?? 0
+  const dsoDays = paidStats?.dso_this_month ?? 0
+  const dsoDeltaDays = dsoDays - (paidStats?.dso_prev_month ?? 0)
+
+  return {
+    rubisCount: org.rubisCount,
+    rubisThisMonth,
+    hoursLiberatedThisMonth: rubisThisMonth * 10,
+    encaisseCents,
+    encaisseDeltaCents,
+    dsoDays,
+    dsoDeltaDays,
+    factureToRelance: counts?.to_relance ?? 0,
+    factureInRelance: counts?.in_relance ?? 0,
+    factureNewToday: counts?.new_today ?? 0,
+    // Mise en demeure pending — sera calculé quand RelanceTask est branché
+    // (count des steps requires_manual_validation programmées). Pour V1 : 0.
+    miseEnDemeurePending: 0,
+    // Goal progress (V1 placeholder) : ratio rubis_count / 250 (objectif
+    // mensuel arbitraire). À paramétrer plus tard.
+    monthlyGoalProgress: Math.min(100, Math.round((rubisThisMonth / 25) * 100)),
+    percentile: undefined,
+  }
+}
+
+/**
+ * Top des clients en retard (top 5 par défaut).
+ * Compte les factures actives dont due_date est dépassée, agrégées par client.
+ */
+export async function topLatePayers(
+  organizationId: string,
+  limit = 5
+): Promise<Array<{ clientId: string; name: string; lateInvoicesCount: number }>> {
+  const today = startOfDay(DateTime.now())
+
+  const rows = await db
+    .from('invoices')
+    .innerJoin('clients', 'clients.id', 'invoices.client_id')
+    .where('invoices.organization_id', organizationId)
+    .whereRaw(`invoices.status::text in ${ACTIVE_INVOICE_STATUSES}`)
+    .where('invoices.due_date', '<', today)
+    .groupBy('clients.id', 'clients.name')
+    .select('clients.id as client_id', 'clients.name as name')
+    .select(db.raw('count(*)::int as late_invoices_count'))
+    .orderBy('late_invoices_count', 'desc')
+    .limit(limit)
+
+  return rows.map((r) => ({
+    clientId: r.client_id,
+    name: r.name,
+    lateInvoicesCount: r.late_invoices_count,
+  }))
+}
diff --git a/apps/api/database/migrations/1778080000900_create_activity_events_table.ts b/apps/api/database/migrations/1778080000900_create_activity_events_table.ts
new file mode 100644
index 0000000..d3465ae
--- /dev/null
+++ b/apps/api/database/migrations/1778080000900_create_activity_events_table.ts
@@ -0,0 +1,44 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+export default class extends BaseSchema {
+  protected tableName = 'activity_events'
+
+  async up() {
+    this.schema.createTable(this.tableName, (table) => {
+      table.uuid('id').primary().notNullable().defaultTo(this.raw('gen_random_uuid()'))
+      table
+        .uuid('organization_id')
+        .notNullable()
+        .references('id')
+        .inTable('organizations')
+        .onDelete('CASCADE')
+
+      // Append-only — pas d'update sur cette table. Les events sont des
+      // snapshots historiques, pas un état mutable.
+      table
+        .enum(
+          'kind',
+          ['relance_sent', 'invoice_paid', 'invoice_imported', 'warning_drafted'],
+          { useNative: true, enumName: 'activity_event_kind' }
+        )
+        .notNullable()
+      table.timestamp('at').notNullable()
+      // Label HTML léger autorisé (<b> pour le nom client/numero) — sanitisé
+      // côté serveur quand on construit le label, pas de user input direct.
+      table.text('label').notNullable()
+      // Méta jsonb : { invoiceId?, clientId?, ... } pour permettre au SPA
+      // de cliquer sur l'event vers la facture/le client concerné.
+      table.jsonb('meta').notNullable().defaultTo('{}')
+
+      table.timestamp('created_at').notNullable()
+      table.timestamp('updated_at').nullable()
+
+      table.index(['organization_id', 'at'])
+    })
+  }
+
+  async down() {
+    this.schema.dropTable(this.tableName)
+    this.schema.raw('DROP TYPE IF EXISTS activity_event_kind')
+  }
+}
diff --git a/apps/api/database/schema.ts b/apps/api/database/schema.ts
index 1ce4c39..89896c8 100644
--- a/apps/api/database/schema.ts
+++ b/apps/api/database/schema.ts
@@ -7,6 +7,27 @@
 import { BaseModel, column } from '@adonisjs/lucid/orm'
 import { DateTime } from 'luxon'
 
+export class ActivityEventSchema extends BaseModel {
+  static $columns = ['at', 'createdAt', 'id', 'kind', 'label', 'meta', 'organizationId', 'updatedAt'] as const
+  $columns = ActivityEventSchema.$columns
+  @column.dateTime()
+  declare at: DateTime
+  @column.dateTime({ autoCreate: true })
+  declare createdAt: DateTime
+  @column({ isPrimary: true })
+  declare id: string
+  @column()
+  declare kind: 'relance_sent' | 'invoice_paid' | 'invoice_imported' | 'warning_drafted'
+  @column()
+  declare label: string
+  @column()
+  declare meta: { invoiceId?: string; clientId?: string; planStepOrder?: number; [k: string]: unknown }
+  @column()
+  declare organizationId: string
+  @column.dateTime({ autoCreate: true, autoUpdate: true })
+  declare updatedAt: DateTime | null
+}
+
 export class AuthAccessTokenSchema extends BaseModel {
   static $columns = ['abilities', 'createdAt', 'expiresAt', 'hash', 'id', 'lastUsedAt', 'name', 'tokenableId', 'type', 'updatedAt'] as const
   $columns = AuthAccessTokenSchema.$columns
diff --git a/apps/api/database/schema_rules.ts b/apps/api/database/schema_rules.ts
index ac9ba5d..4355a2b 100644
--- a/apps/api/database/schema_rules.ts
+++ b/apps/api/database/schema_rules.ts
@@ -21,6 +21,18 @@ export default {
         },
       },
     },
+    activity_events: {
+      columns: {
+        kind: {
+          tsType:
+            "'relance_sent' | 'invoice_paid' | 'invoice_imported' | 'warning_drafted'",
+        },
+        meta: {
+          tsType:
+            "{ invoiceId?: string; clientId?: string; planStepOrder?: number; [k: string]: unknown }",
+        },
+      },
+    },
     import_drafts: {
       columns: {
         status: {
diff --git a/apps/api/start/routes.ts b/apps/api/start/routes.ts
index 45d2267..6ecf6bb 100644
--- a/apps/api/start/routes.ts
+++ b/apps/api/start/routes.ts
@@ -85,6 +85,19 @@ router
       .as('plans')
       .use(middleware.auth())
 
+    /**
+     * Dashboard — auth requise. Calculs agrégés on-the-fly (pas de cache V1).
+     */
+    router
+      .group(() => {
+        router.get('kpis', [controllers.Dashboard, 'kpis']).as('kpis')
+        router.get('activity', [controllers.Dashboard, 'activity']).as('activity')
+        router.get('top-late', [controllers.Dashboard, 'topLate']).as('top-late')
+      })
+      .prefix('dashboard')
+      .as('dashboard')
+      .use(middleware.auth())
+
     /**
      * Invoices — auth requise. Ordre IMPORTANT : les routes statiques
      * (/upload, /counts, /import-batch/...) sont déclarées AVANT /:id
diff --git a/bruno/07-Dashboard/01 KPIs.bru b/bruno/07-Dashboard/01 KPIs.bru
new file mode 100644
index 0000000..6c25e34
--- /dev/null
+++ b/bruno/07-Dashboard/01 KPIs.bru	
@@ -0,0 +1,48 @@
+meta {
+  name: 01 KPIs
+  type: http
+  seq: 1
+}
+
+get {
+  url: {{baseUrl}}/api/v1/dashboard/kpis
+  body: none
+  auth: inherit
+}
+
+tests {
+  test("200 OK", function () {
+    expect(res.getStatus()).to.equal(200);
+  });
+  test("KPIs shape", function () {
+    const k = res.getBody().data;
+    for (const key of [
+      "rubisCount", "rubisThisMonth", "hoursLiberatedThisMonth",
+      "encaisseCents", "encaisseDeltaCents",
+      "dsoDays", "dsoDeltaDays",
+      "factureToRelance", "factureInRelance", "factureNewToday",
+      "miseEnDemeurePending", "monthlyGoalProgress"
+    ]) {
+      expect(k).to.have.property(key);
+    }
+  });
+}
+
+docs {
+  GET /api/v1/dashboard/kpis
+
+  Calculs agrégés sur les invoices de l'org :
+  - `rubisCount` lu sur Organization (compteur cumulé)
+  - `rubisThisMonth` = sum(rubis_earned where paid_at >= startOfMonth)
+  - `hoursLiberatedThisMonth` = rubisThisMonth × 10 (1 rubis = 10 min)
+  - `encaisseCents` = sum(amount_ttc_cents where paid this month)
+  - `encaisseDeltaCents` = ce mois − mois précédent
+  - `dsoDays` = avg(paid_at − issue_date) en jours, sur factures payées ce mois
+  - `dsoDeltaDays` = idem delta vs mois précédent
+  - `factureToRelance` = count(status='pending')
+  - `factureInRelance` = count(status='in_relance')
+  - `factureNewToday` = count(created_at >= today)
+  - `miseEnDemeurePending` = 0 (à brancher quand RelanceTask sera là)
+  - `monthlyGoalProgress` = clamp(rubisThisMonth/25*100, 0, 100) — placeholder
+  - `percentile` = undefined V1
+}
diff --git a/bruno/07-Dashboard/02 Activity.bru b/bruno/07-Dashboard/02 Activity.bru
new file mode 100644
index 0000000..b8b6b69
--- /dev/null
+++ b/bruno/07-Dashboard/02 Activity.bru	
@@ -0,0 +1,48 @@
+meta {
+  name: 02 Activity
+  type: http
+  seq: 2
+}
+
+get {
+  url: {{baseUrl}}/api/v1/dashboard/activity
+  body: none
+  auth: inherit
+}
+
+tests {
+  test("200 OK", function () {
+    expect(res.getStatus()).to.equal(200);
+  });
+  test("data is array", function () {
+    expect(res.getBody().data).to.be.an("array");
+  });
+}
+
+docs {
+  GET /api/v1/dashboard/activity
+
+  Journal d'activité — append-only, 20 derniers events de l'org, plus
+  récent en tête.
+
+  Kinds émis :
+  - `invoice_paid` (Invoices → Mark paid)
+  - `invoice_imported` (Imports → Validate draft)
+  - `relance_sent` (à venir, SendRelanceJob)
+  - `warning_drafted` (à venir, mise en demeure)
+
+  Chaque event a :
+  ```json
+  {
+    "id": "<uuid>",
+    "kind": "...",
+    "at": "ISO 8601",
+    "label": "Texte HTML léger (<b> autorisé pour les noms d'entité)",
+    "meta": { "invoiceId": "...", "clientId": "..." }
+  }
+  ```
+
+  Pour générer des events : encaisse une facture (Invoices → 06 Mark paid)
+  ou valide un draft d'import (Imports → 03 Validate draft) puis re-call
+  cette route.
+}
diff --git a/bruno/07-Dashboard/03 Top late payers.bru b/bruno/07-Dashboard/03 Top late payers.bru
new file mode 100644
index 0000000..5d99089
--- /dev/null
+++ b/bruno/07-Dashboard/03 Top late payers.bru	
@@ -0,0 +1,37 @@
+meta {
+  name: 03 Top late payers
+  type: http
+  seq: 3
+}
+
+get {
+  url: {{baseUrl}}/api/v1/dashboard/top-late
+  body: none
+  auth: inherit
+}
+
+tests {
+  test("200 OK", function () {
+    expect(res.getStatus()).to.equal(200);
+  });
+  test("data shape", function () {
+    const list = res.getBody().data;
+    expect(list).to.be.an("array");
+    if (list.length > 0) {
+      expect(list[0]).to.have.property("clientId");
+      expect(list[0]).to.have.property("name");
+      expect(list[0]).to.have.property("lateInvoicesCount");
+    }
+  });
+}
+
+docs {
+  GET /api/v1/dashboard/top-late
+
+  Top 5 des clients ayant le plus de factures en retard. "En retard" =
+  status actif (pending / in_relance / awaiting_user_confirmation) ET
+  due_date < today.
+
+  Pour générer des données : crée des factures avec une `dueDate` dans
+  le passé via Invoices → 04 Create.
+}
diff --git a/bruno/07-Dashboard/folder.bru b/bruno/07-Dashboard/folder.bru
new file mode 100644
index 0000000..24ee3ae
--- /dev/null
+++ b/bruno/07-Dashboard/folder.bru
@@ -0,0 +1,21 @@
+meta {
+  name: Dashboard
+  seq: 8
+}
+
+auth {
+  mode: bearer
+}
+
+auth:bearer {
+  token: {{token}}
+}
+
+docs {
+  ## Dashboard — KPIs, journal d'activité, top clients en retard
+
+  Tout est calculé on-the-fly côté SQL (pas de cache V1). Le journal
+  d'activité est append-only et alimenté automatiquement par les
+  controllers métier (mark-paid → invoice_paid, validate-draft →
+  invoice_imported, etc.).
+}