diff --git a/api/main.py b/api/main.py
index 6fbb3bf..2f6a7cb 100644
--- a/api/main.py
+++ b/api/main.py
@@ -57,6 +57,11 @@ def services_page():
     return _read_page("services.html")
 
 
+@app.get("/collecte", response_class=HTMLResponse)
+def collecte_page():
+    return _read_page("collecte.html")
+
+
 @app.get("/health")
 def health():
     try:
@@ -150,3 +155,42 @@ def api_resource_detail(provider: str, name: str, service_name: str):
         return queries.resource_detail(conn, provider, name, service_name)
     finally:
         conn.close()
+
+
+@app.get("/api/collection-runs")
+def api_collection_runs(limit: int = Query(50, ge=1, le=200)):
+    conn = queries.get_connection()
+    try:
+        return {"runs": queries.list_collection_runs(conn, limit=limit)}
+    finally:
+        conn.close()
+
+
+@app.get("/api/collection-runs/alert-status")
+def api_collection_runs_alert_status():
+    conn = queries.get_connection()
+    try:
+        return {"has_unacknowledged_errors": queries.has_unacknowledged_errors(conn)}
+    finally:
+        conn.close()
+
+
+@app.get("/api/collection-runs/{run_id}/errors")
+def api_collection_run_errors(run_id: int):
+    conn = queries.get_connection()
+    try:
+        return {"errors": queries.collection_run_errors(conn, run_id)}
+    finally:
+        conn.close()
+
+
+@app.post("/api/collection-runs/{run_id}/acknowledge")
+def api_acknowledge_collection_run(run_id: int):
+    conn = queries.get_connection()
+    try:
+        acknowledged = queries.acknowledge_collection_run(conn, run_id)
+        if not acknowledged:
+            raise HTTPException(status_code=404, detail="Exécution introuvable ou déjà acquittée")
+        return {"status": "acknowledged"}
+    finally:
+        conn.close()
diff --git a/api/queries.py b/api/queries.py
index 33f7708..cc4a256 100644
--- a/api/queries.py
+++ b/api/queries.py
@@ -10,7 +10,7 @@ from __future__ import annotations
 
 import os
 import sqlite3
-from datetime import date
+from datetime import date, datetime, timezone
 from pathlib import Path
 
 DEFAULT_DB_PATH = "cost_dashboard.db"
@@ -656,3 +656,61 @@ def resource_detail(conn: sqlite3.Connection, provider: str, name: str, service_
         "period_end": period_end,
         "resources": resources,
     }
+
+
+# ----------------------------------------------------------------------
+# Exécutions de collecte (page "Collecte")
+# ----------------------------------------------------------------------
+
+def list_collection_runs(conn: sqlite3.Connection, limit: int = 50) -> list[dict]:
+    rows = conn.execute(
+        """
+        SELECT id, run_type, started_at, finished_at, tenants_ok, tenants_error, acknowledged_at
+        FROM collection_runs
+        ORDER BY started_at DESC
+        LIMIT ?
+        """,
+        (limit,),
+    ).fetchall()
+    return [dict(r) for r in rows]
+
+
+def collection_run_errors(conn: sqlite3.Connection, run_id: int) -> list[dict]:
+    """Détail des relevés en erreur d'une exécution — relu depuis
+    `collections` sur la fenêtre [started_at, finished_at] du run, plutôt que
+    dupliqué dans collection_runs."""
+    run = conn.execute(
+        "SELECT started_at, finished_at FROM collection_runs WHERE id = ?", (run_id,)
+    ).fetchone()
+    if run is None:
+        return []
+
+    rows = conn.execute(
+        """
+        SELECT provider, tenant_name, granularity, period_start, error_message, collected_at
+        FROM collections
+        WHERE status = 'error' AND collected_at BETWEEN ? AND ?
+        ORDER BY collected_at
+        """,
+        (run["started_at"], run["finished_at"] or run["started_at"]),
+    ).fetchall()
+    return [dict(r) for r in rows]
+
+
+def has_unacknowledged_errors(conn: sqlite3.Connection) -> bool:
+    row = conn.execute(
+        "SELECT 1 FROM collection_runs WHERE tenants_error > 0 AND acknowledged_at IS NULL LIMIT 1"
+    ).fetchone()
+    return row is not None
+
+
+def acknowledge_collection_run(conn: sqlite3.Connection, run_id: int) -> bool:
+    """Seule écriture de ce module (le reste est lecture seule) : marque une
+    exécution en erreur comme acquittée manuellement depuis le dashboard.
+    Retourne False si l'exécution n'existe pas ou était déjà acquittée."""
+    cur = conn.execute(
+        "UPDATE collection_runs SET acknowledged_at = ? WHERE id = ? AND acknowledged_at IS NULL",
+        (datetime.now(timezone.utc).isoformat(), run_id),
+    )
+    conn.commit()
+    return cur.rowcount > 0
diff --git a/collector/backfill_historical.py b/collector/backfill_historical.py
index 2de2e28..718de94 100644
--- a/collector/backfill_historical.py
+++ b/collector/backfill_historical.py
@@ -51,7 +51,7 @@ from pathlib import Path
 
 sys.path.insert(0, str(Path(__file__).parent))
 
-from db import get_connection, init_db, upsert_collection
+from db import get_connection, init_db, upsert_collection, start_collection_run, finish_collection_run
 from providers import get_aws_cost, get_azure_cost, convert_result
 from collect import collect_tenant, collect_tenant_resources, RESOURCE_WINDOW_DAYS
 
@@ -89,8 +89,12 @@ def month_ranges(n_months: int) -> list[tuple[date, date]]:
     return list(reversed(months))
 
 
-def backfill_tenant(conn, provider: str, entry: dict, months: list[tuple[date, date]]) -> None:
+def backfill_tenant(conn, provider: str, entry: dict, months: list[tuple[date, date]]) -> tuple[int, int]:
+    """Retourne (nb_relevés_ok, nb_relevés_en_erreur) — un mois vide (aucune
+    donnée) n'est compté ni comme un succès ni comme une erreur."""
     name = entry["name"]
+    ok = 0
+    errors = 0
     for start, end in months:
         collected_at = datetime.now(timezone.utc).isoformat()
         month_label = start.isoformat()[:7]
@@ -113,15 +117,19 @@ def backfill_tenant(conn, provider: str, entry: dict, months: list[tuple[date, d
                 conn, provider, name, "monthly", start.isoformat(), end.isoformat(),
                 collected_at, "ok", data=data,
             )
+            ok += 1
             log.info("OK    %-6s %-30s %s  %.2f %s", provider, name, month_label, data["total"], data["currency"])
 
         except Exception as e:
+            errors += 1
             log.error("ECHEC %-6s %-30s %s : %s", provider, name, month_label, e)
 
         finally:
             if provider == "azure":
                 time.sleep(AZURE_CALL_DELAY_SECONDS)
 
+    return ok, errors
+
 
 def day_ranges(n_days: int) -> list[date]:
     """Les n derniers jours (le plus ancien en premier), jusqu'à hier inclus
@@ -131,25 +139,32 @@ def day_ranges(n_days: int) -> list[date]:
     return [yesterday - timedelta(days=i) for i in range(n_days - 1, -1, -1)]
 
 
-def backfill_tenant_daily(conn, provider: str, entry: dict, days: list[date]) -> None:
+def backfill_tenant_daily(conn, provider: str, entry: dict, days: list[date]) -> tuple[int, int]:
     """Rejoue collect_tenant (collect.py) sur chaque jour de `days`, puis
     collect_tenant_resources une fois si au moins un jour a réussi — exactement
-    ce que ferait le cron quotidien, jour après jour, mais en une passe."""
+    ce que ferait le cron quotidien, jour après jour, mais en une passe.
+    Retourne (nb_jours_ok, nb_jours_en_erreur)."""
     if not days:
-        return
+        return 0, 0
 
-    any_ok = False
+    ok_count = 0
+    error_count = 0
     for day in days:
         ok = collect_tenant(conn, provider, entry, day.isoformat(), (day + timedelta(days=1)).isoformat())
-        any_ok = any_ok or ok
+        if ok:
+            ok_count += 1
+        else:
+            error_count += 1
         if provider == "azure":
             time.sleep(AZURE_CALL_DELAY_SECONDS)
 
-    if any_ok:
+    if ok_count > 0:
         resource_end = days[-1] + timedelta(days=1)
         resource_start = resource_end - timedelta(days=RESOURCE_WINDOW_DAYS)
         collect_tenant_resources(conn, provider, entry, resource_start.isoformat(), resource_end.isoformat())
 
+    return ok_count, error_count
+
 
 def main():
     parser = argparse.ArgumentParser(description="Backfill de l'historique de coûts depuis AWS/Azure")
@@ -183,13 +198,20 @@ def main():
     if days:
         log.info("Backfill journalier de %d jours (%s -> %s)", len(days), days[0].isoformat(), days[-1].isoformat())
 
+    run_id = start_collection_run(conn, "backfill")
+    total_ok = 0
+    total_error = 0
+
     for provider, entries in (("aws", config.get("aws", [])), ("azure", config.get("azure", []))):
         for entry in entries:
             if args.tenant and entry["name"] != args.tenant:
                 continue
-            backfill_tenant(conn, provider, entry, months)
-            backfill_tenant_daily(conn, provider, entry, days)
+            ok1, err1 = backfill_tenant(conn, provider, entry, months)
+            ok2, err2 = backfill_tenant_daily(conn, provider, entry, days)
+            total_ok += ok1 + ok2
+            total_error += err1 + err2
 
+    finish_collection_run(conn, run_id, total_ok, total_error)
     conn.close()
     log.info("Terminé.")
 
diff --git a/collector/collect.py b/collector/collect.py
index f89e0d8..c250358 100644
--- a/collector/collect.py
+++ b/collector/collect.py
@@ -29,6 +29,7 @@ sys.path.insert(0, str(Path(__file__).parent))
 from db import (
     get_connection, init_db, upsert_collection,
     upsert_resource_costs, set_resource_collection_status,
+    start_collection_run, finish_collection_run,
 )
 from providers import (
     get_aws_cost, get_azure_cost, convert_result,
@@ -148,15 +149,23 @@ def main():
     resource_period_end = target_day + timedelta(days=1)
     resource_period_start = resource_period_end - timedelta(days=RESOURCE_WINDOW_DAYS)
 
+    run_id = start_collection_run(conn, "daily")
+    tenants_ok = 0
+    tenants_error = 0
+
     for provider, entries in (("aws", config.get("aws", [])), ("azure", config.get("azure", []))):
         for entry in entries:
             ok = collect_tenant(conn, provider, entry, period_start, period_end)
             if ok:
+                tenants_ok += 1
                 collect_tenant_resources(
                     conn, provider, entry,
                     resource_period_start.isoformat(), resource_period_end.isoformat(),
                 )
+            else:
+                tenants_error += 1
 
+    finish_collection_run(conn, run_id, tenants_ok, tenants_error)
     conn.close()
     log.info("Terminé.")
 
diff --git a/collector/db.py b/collector/db.py
index 46d1774..5bdb7d0 100644
--- a/collector/db.py
+++ b/collector/db.py
@@ -10,6 +10,7 @@ from __future__ import annotations
 
 import os
 import sqlite3
+from datetime import datetime, timezone
 from pathlib import Path
 
 DEFAULT_DB_PATH = "cost_dashboard.db"
@@ -134,6 +135,30 @@ def set_resource_collection_status(
     conn.commit()
 
 
+def start_collection_run(conn: sqlite3.Connection, run_type: str) -> int:
+    """Enregistre le début d'une exécution de collecte (page "Collecte" du
+    dashboard). `run_type` : 'daily' (collect.py) ou 'backfill'
+    (backfill_historical.py)."""
+    cur = conn.execute(
+        "INSERT INTO collection_runs (run_type, started_at) VALUES (?, ?)",
+        (run_type, datetime.now(timezone.utc).isoformat()),
+    )
+    conn.commit()
+    return cur.lastrowid
+
+
+def finish_collection_run(conn: sqlite3.Connection, run_id: int, tenants_ok: int, tenants_error: int) -> None:
+    conn.execute(
+        """
+        UPDATE collection_runs
+        SET finished_at = ?, tenants_ok = ?, tenants_error = ?
+        WHERE id = ?
+        """,
+        (datetime.now(timezone.utc).isoformat(), tenants_ok, tenants_error, run_id),
+    )
+    conn.commit()
+
+
 def upsert_resource_costs(
     conn: sqlite3.Connection,
     provider: str,
diff --git a/db/schema.sql b/db/schema.sql
index e1fc2d7..c68407d 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -74,3 +74,23 @@ CREATE TABLE IF NOT EXISTS resource_collection_status (
     collected_at    TIMESTAMP NOT NULL,
     PRIMARY KEY (provider, tenant_name)
 );
+
+-- Historique des exécutions de tâches de collecte (page "Collecte" du
+-- dashboard) : une ligne par lancement de collect.py (run_type='daily') ou
+-- backfill_historical.py (run_type='backfill'). Le détail des tenants en
+-- erreur n'est pas dupliqué ici : il se relit dans `collections`
+-- (status='error') sur la fenêtre [started_at, finished_at] de l'exécution.
+-- acknowledged_at reste NULL tant qu'une erreur n'a pas été acquittée
+-- manuellement depuis le dashboard.
+CREATE TABLE IF NOT EXISTS collection_runs (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    run_type        TEXT NOT NULL CHECK(run_type IN ('daily', 'backfill')),
+    started_at      TIMESTAMP NOT NULL,
+    finished_at     TIMESTAMP,
+    tenants_ok      INTEGER NOT NULL DEFAULT 0,
+    tenants_error   INTEGER NOT NULL DEFAULT 0,
+    acknowledged_at TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_collection_runs_started
+    ON collection_runs(started_at);
diff --git a/frontend/collecte.html b/frontend/collecte.html
new file mode 100644
index 0000000..75c36ec
--- /dev/null
+++ b/frontend/collecte.html
@@ -0,0 +1,61 @@
+<!doctype html>
+<html lang="fr">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Collecte — simple-cost-dashboard</title>
+<link rel="stylesheet" href="/static/style.css">
+</head>
+<body>
+
+<div class="app-shell">
+<aside class="sidebar">
+  <p class="sidebar-brand">simple-cost-dashboard</p>
+  <nav class="sidebar-nav">
+    <a href="/" class="sidebar-link">Compte</a>
+    <a href="/services" class="sidebar-link">Services</a>
+    <a href="/collecte" class="sidebar-link active">Collecte<span class="nav-alert-dot" id="nav-collecte-alert" hidden></span></a>
+  </nav>
+</aside>
+<div class="page">
+
+<header class="topbar">
+  <div class="topbar-title">
+    <h1>Collecte</h1>
+    <span class="breadcrumb">historique des exécutions (collecte journalière et backfill historique)</span>
+  </div>
+</header>
+
+<main class="container">
+
+  <div id="error-banner"></div>
+
+  <p class="section-title">Exécutions</p>
+  <div class="card" style="padding: 16px 20px 4px;">
+    <p class="chart-card-sub" style="margin: 0 0 12px;">Clique une exécution pour voir le détail des erreurs.</p>
+    <div id="runs-table-wrap">
+      <div class="skeleton">Chargement…</div>
+    </div>
+  </div>
+
+</main>
+
+</div>
+</div>
+
+<div class="drawer-backdrop" id="drawer-backdrop"></div>
+<aside class="drawer" id="run-drawer" aria-hidden="true">
+  <div class="drawer-header">
+    <div>
+      <h3 id="drawer-title">Exécution</h3>
+      <p id="drawer-sub">&nbsp;</p>
+    </div>
+    <button class="drawer-close" id="drawer-close" aria-label="Fermer">&times;</button>
+  </div>
+  <div class="drawer-body" id="drawer-body"></div>
+</aside>
+
+<script src="/static/common.js"></script>
+<script src="/static/collecte.js"></script>
+</body>
+</html>
diff --git a/frontend/index.html b/frontend/index.html
index 3f6612b..deef28c 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -15,6 +15,7 @@
   <nav class="sidebar-nav">
     <a href="/" class="sidebar-link active">Compte</a>
     <a href="/services" class="sidebar-link">Services</a>
+    <a href="/collecte" class="sidebar-link">Collecte<span class="nav-alert-dot" id="nav-collecte-alert" hidden></span></a>
   </nav>
 </aside>
 <div class="page">
@@ -43,10 +44,6 @@
       <p class="kpi-label">Azure — mois en cours</p>
       <p class="kpi-value" id="kpi-azure">—</p>
     </div>
-    <div class="card kpi-card">
-      <p class="kpi-label">Tenants en échec de collecte</p>
-      <p class="kpi-value" id="kpi-errors">—</p>
-    </div>
   </div>
 
   <p class="section-title">Évolution mensuelle (12 mois glissants)</p>
diff --git a/frontend/services.html b/frontend/services.html
index c33464c..9a25160 100644
--- a/frontend/services.html
+++ b/frontend/services.html
@@ -14,6 +14,7 @@
   <nav class="sidebar-nav">
     <a href="/" class="sidebar-link">Compte</a>
     <a href="/services" class="sidebar-link active">Services</a>
+    <a href="/collecte" class="sidebar-link">Collecte<span class="nav-alert-dot" id="nav-collecte-alert" hidden></span></a>
   </nav>
 </aside>
 <div class="page">
diff --git a/frontend/static/app.js b/frontend/static/app.js
index 04611bb..2ff9c1b 100644
--- a/frontend/static/app.js
+++ b/frontend/static/app.js
@@ -20,10 +20,6 @@ function renderKpis(data) {
   document.getElementById("kpi-azure").textContent = formatEUR(data.kpis.total_azure_current_month);
 
   const errorCount = data.kpis.tenants_error.length;
-  const errEl = document.getElementById("kpi-errors");
-  errEl.textContent = String(errorCount);
-  errEl.style.color = errorCount > 0 ? "var(--status-critical)" : "";
-
   const banner = document.getElementById("error-banner");
   if (errorCount > 0) {
     const names = data.kpis.tenants_error
@@ -33,7 +29,7 @@ function renderKpis(data) {
       <div class="banner error">
         <div>
           <strong>${errorCount} tenant${errorCount > 1 ? "s" : ""} en échec de collecte</strong> :
-          ${names}. Voir la table ci-dessous ou <code>cron.log</code> pour le détail.
+          ${names}. Voir la table ci-dessous ou <a href="/collecte">la page Collecte</a> pour le détail.
         </div>
       </div>`;
   } else {
diff --git a/frontend/static/collecte.js b/frontend/static/collecte.js
new file mode 100644
index 0000000..4e66a7f
--- /dev/null
+++ b/frontend/static/collecte.js
@@ -0,0 +1,181 @@
+// collecte.js — page "Collecte" : historique des exécutions de tâches de
+// collecte (cron quotidien + backfill historique), détail des erreurs par
+// exécution, et acquittement manuel.
+
+let currentRuns = [];
+
+async function loadRuns() {
+  const res = await fetch("/api/collection-runs");
+  if (!res.ok) throw new Error(`API collection-runs: HTTP ${res.status}`);
+  return res.json();
+}
+
+function runTypeLabel(type) {
+  return type === "backfill" ? "Historique (backfill)" : "Journalière";
+}
+
+function formatDateTime(iso) {
+  if (!iso) return "—";
+  return new Intl.DateTimeFormat("fr-FR", { dateStyle: "medium", timeStyle: "short" }).format(new Date(iso));
+}
+
+function formatDuration(startIso, endIso) {
+  if (!startIso || !endIso) return "—";
+  const seconds = Math.max(0, Math.round((new Date(endIso) - new Date(startIso)) / 1000));
+  if (seconds < 60) return `${seconds} s`;
+  return `${Math.floor(seconds / 60)} min ${seconds % 60} s`;
+}
+
+function statusBadge(run) {
+  if (run.tenants_error === 0) {
+    return `<span class="status-label"><span class="status-dot ok"></span>OK</span>`;
+  }
+  if (run.acknowledged_at) {
+    return `<span class="status-label"><span class="status-dot warning"></span>Erreurs (acquittées)</span>`;
+  }
+  return `<span class="status-label"><span class="status-dot error"></span>Erreurs</span>`;
+}
+
+function renderRunsTable() {
+  const wrap = document.getElementById("runs-table-wrap");
+
+  if (currentRuns.length === 0) {
+    wrap.innerHTML = `<div class="empty-state">Aucune exécution enregistrée pour l'instant. Lance <code>collect.py</code> ou <code>backfill_historical.py</code>.</div>`;
+    return;
+  }
+
+  const rows = currentRuns
+    .map(
+      (r) => `
+      <tr class="clickable" data-id="${r.id}">
+        <td>${runTypeLabel(r.run_type)}</td>
+        <td>${formatDateTime(r.started_at)}</td>
+        <td>${formatDuration(r.started_at, r.finished_at)}</td>
+        <td class="num">${r.tenants_ok}</td>
+        <td class="num">${r.tenants_error}</td>
+        <td>${statusBadge(r)}</td>
+      </tr>`
+    )
+    .join("");
+
+  wrap.innerHTML = `
+    <table class="data-table">
+      <thead>
+        <tr>
+          <th>Type</th>
+          <th>Démarrée</th>
+          <th>Durée</th>
+          <th class="num">OK</th>
+          <th class="num">Erreurs</th>
+          <th>Statut</th>
+        </tr>
+      </thead>
+      <tbody>${rows}</tbody>
+    </table>`;
+
+  wrap.querySelectorAll("tr.clickable").forEach((tr) => {
+    tr.addEventListener("click", () => openRunDrawer(Number(tr.dataset.id)));
+  });
+}
+
+function openRunDrawer(runId) {
+  const run = currentRuns.find((r) => r.id === runId);
+  if (!run) return;
+
+  document.getElementById("drawer-title").textContent = `${runTypeLabel(run.run_type)} — ${formatDateTime(run.started_at)}`;
+  document.getElementById("drawer-sub").textContent = `${run.tenants_ok} OK, ${run.tenants_error} en erreur`;
+  document.getElementById("run-drawer").classList.add("open");
+  document.getElementById("run-drawer").setAttribute("aria-hidden", "false");
+  document.getElementById("drawer-backdrop").classList.add("open");
+
+  if (run.tenants_error === 0) {
+    document.getElementById("drawer-body").innerHTML = `<div class="empty-state">Aucune erreur sur cette exécution.</div>`;
+    return;
+  }
+
+  document.getElementById("drawer-body").innerHTML = `<div class="skeleton">Chargement…</div>`;
+
+  fetch(`/api/collection-runs/${runId}/errors`)
+    .then((res) => {
+      if (!res.ok) throw new Error(`HTTP ${res.status}`);
+      return res.json();
+    })
+    .then((data) => renderDrawerContent(run, data.errors))
+    .catch((e) => {
+      document.getElementById("drawer-body").innerHTML =
+        `<div class="banner error"><strong>Erreur de chargement</strong> : ${escapeHtml(e.message)}</div>`;
+    });
+}
+
+function renderDrawerContent(run, errors) {
+  const bodyEl = document.getElementById("drawer-body");
+
+  const list = errors
+    .map(
+      (e) => `
+      <div class="resource-row" style="flex-direction:column; align-items:flex-start; gap:4px;">
+        <div class="resource-name">
+          <span class="provider-badge ${e.provider}">${providerLabel(e.provider)}</span>
+          ${escapeHtml(e.tenant_name)} — ${escapeHtml(e.period_start)}
+        </div>
+        <div class="resource-pct">${escapeHtml(e.error_message || "erreur inconnue")}</div>
+      </div>`
+    )
+    .join("");
+
+  const ackBlock = run.acknowledged_at
+    ? `<p class="chart-card-sub" style="margin: 0 0 14px;">Acquittée le ${formatDateTime(run.acknowledged_at)}</p>`
+    : `<button type="button" class="btn" id="ack-button" style="margin-bottom: 14px;">Acquitter cette erreur</button>`;
+
+  bodyEl.innerHTML = `${ackBlock}${list}`;
+
+  const btn = document.getElementById("ack-button");
+  if (btn) {
+    btn.addEventListener("click", () => acknowledgeRun(run.id));
+  }
+}
+
+async function acknowledgeRun(runId) {
+  const btn = document.getElementById("ack-button");
+  if (btn) btn.disabled = true;
+
+  try {
+    const res = await fetch(`/api/collection-runs/${runId}/acknowledge`, { method: "POST" });
+    if (!res.ok) throw new Error(`HTTP ${res.status}`);
+    closeRunDrawer();
+    await init();
+    refreshCollecteAlert();
+  } catch (e) {
+    document.getElementById("drawer-body").innerHTML =
+      `<div class="banner error"><strong>Erreur</strong> : ${escapeHtml(e.message)}</div>`;
+  }
+}
+
+function closeRunDrawer() {
+  document.getElementById("run-drawer").classList.remove("open");
+  document.getElementById("run-drawer").setAttribute("aria-hidden", "true");
+  document.getElementById("drawer-backdrop").classList.remove("open");
+}
+
+function setupDrawer() {
+  document.getElementById("drawer-close").addEventListener("click", closeRunDrawer);
+  document.getElementById("drawer-backdrop").addEventListener("click", closeRunDrawer);
+  document.addEventListener("keydown", (e) => {
+    if (e.key === "Escape") closeRunDrawer();
+  });
+}
+
+async function init() {
+  try {
+    const data = await loadRuns();
+    currentRuns = data.runs;
+    renderRunsTable();
+  } catch (e) {
+    document.getElementById("error-banner").innerHTML = `
+      <div class="banner error"><strong>Erreur de chargement</strong> : ${escapeHtml(e.message)}</div>`;
+    document.getElementById("runs-table-wrap").innerHTML = "";
+  }
+}
+
+init();
+setupDrawer();
diff --git a/frontend/static/common.js b/frontend/static/common.js
index 89924fb..6dcf4a4 100644
--- a/frontend/static/common.js
+++ b/frontend/static/common.js
@@ -63,6 +63,24 @@ function cssVar(name) {
   return getComputedStyle(document.documentElement).getPropertyValue(name).trim();
 }
 
+// Pastille d'alerte sur le lien "Collecte" de la sidebar (présente sur
+// toutes les pages) — signale une erreur de collecte pas encore acquittée.
+// La page Collecte elle-même se rafraîchit après un acquittement.
+async function refreshCollecteAlert() {
+  const dot = document.getElementById("nav-collecte-alert");
+  if (!dot) return;
+  try {
+    const res = await fetch("/api/collection-runs/alert-status");
+    if (!res.ok) return;
+    const data = await res.json();
+    dot.hidden = !data.has_unacknowledged_errors;
+  } catch (e) {
+    // silencieux : une pastille ratée ne doit pas bloquer le reste de la page
+  }
+}
+
+refreshCollecteAlert();
+
 // Config partagée des axes/grilles Chart.js (gridlines discrètes, pas de
 // deuxième axe, tooltip alignée sur le design system).
 function chartBaseOptions() {
diff --git a/frontend/static/style.css b/frontend/static/style.css
index 9516636..be0c097 100644
--- a/frontend/static/style.css
+++ b/frontend/static/style.css
@@ -180,7 +180,9 @@ a {
 }
 
 .sidebar-link {
-  display: block;
+  display: flex;
+  align-items: center;
+  gap: 7px;
   padding: 9px 12px;
   border-radius: var(--radius-control);
   color: var(--text-secondary);
@@ -189,6 +191,14 @@ a {
   font-weight: 500;
 }
 
+.nav-alert-dot {
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  background: var(--status-critical);
+  flex: none;
+}
+
 .sidebar-link:hover {
   background: color-mix(in srgb, var(--text-primary) 6%, transparent);
   color: var(--text-primary);
@@ -527,6 +537,7 @@ table.data-table {
 
 .status-dot.ok { background: var(--status-good); }
 .status-dot.error { background: var(--status-critical); }
+.status-dot.warning { background: var(--status-warning); }
 .status-dot.unknown { background: var(--text-muted); }
 
 .status-label {
@@ -660,6 +671,25 @@ table.data-table {
   padding: 8px 20px 20px;
 }
 
+.btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  border: 1px solid var(--border);
+  background: var(--surface-1);
+  color: var(--text-primary);
+  font-size: 13px;
+  font-weight: 500;
+  padding: 8px 14px;
+  border-radius: var(--radius-control);
+  cursor: pointer;
+  font-family: inherit;
+}
+
+.btn:hover {
+  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
+}
+
 .resource-row {
   display: flex;
   align-items: center;
diff --git a/frontend/tenant.html b/frontend/tenant.html
index 5da3b15..3a520ad 100644
--- a/frontend/tenant.html
+++ b/frontend/tenant.html
@@ -15,6 +15,7 @@
   <nav class="sidebar-nav">
     <a href="/" class="sidebar-link active">Compte</a>
     <a href="/services" class="sidebar-link">Services</a>
+    <a href="/collecte" class="sidebar-link">Collecte<span class="nav-alert-dot" id="nav-collecte-alert" hidden></span></a>
   </nav>
 </aside>
 <div class="page">