diff --git a/lib/stats.js b/lib/stats.js
new file mode 100644
index 0000000..277c21e
--- /dev/null
+++ b/lib/stats.js
@@ -0,0 +1,142 @@
+(function (root) {
+  function summarizePerHoster(history, opts) {
+    const out = {};
+    if (!Array.isArray(history)) return out;
+    const cutoff = opts && Number.isFinite(opts.sinceMs) ? opts.sinceMs : null;
+    const limitBatches = opts && Number.isFinite(opts.lastNBatches) && opts.lastNBatches > 0 ? opts.lastNBatches : null;
+
+    const entries = [...history];
+    entries.sort((a, b) => {
+      const ta = a && a.timestamp ? Date.parse(a.timestamp) : 0;
+      const tb = b && b.timestamp ? Date.parse(b.timestamp) : 0;
+      return tb - ta;
+    });
+    const sliced = limitBatches ? entries.slice(0, limitBatches) : entries;
+
+    for (const batch of sliced) {
+      if (!batch || !Array.isArray(batch.files)) continue;
+      if (cutoff !== null) {
+        const ts = batch.timestamp ? Date.parse(batch.timestamp) : 0;
+        if (!ts || ts < cutoff) continue;
+      }
+      for (const file of batch.files) {
+        if (!file || !Array.isArray(file.results)) continue;
+        for (const r of file.results) {
+          if (!r || !r.hoster) continue;
+          const bucket = out[r.hoster] || (out[r.hoster] = { ok: 0, fail: 0, total: 0 });
+          bucket.total++;
+          if (r.status === 'done') bucket.ok++;
+          else bucket.fail++;
+        }
+      }
+    }
+    for (const h of Object.keys(out)) {
+      const b = out[h];
+      b.rate = b.total > 0 ? b.ok / b.total : null;
+    }
+    return out;
+  }
+
+  function classifyErrorCategory(err) {
+    if (!err || typeof err !== 'string') return 'unknown';
+    const s = err.toLowerCase();
+    if (/abgebrochen|aborted|cancel/.test(s)) return 'aborted';
+    if (/not video file format|kein videoformat|invalid file|wrong format|duplicate|already exists|file too (small|big|large)|datei zu (gro|klein)/.test(s)) return 'file-rejected';
+    if (/quota|storage (full|exhausted|voll)|account (full|banned|suspended)|disk (space )?full|insufficient (disk )?space|not enough (disk )?(space|storage)/.test(s)) return 'account-error';
+    if (/csrf|kein upload-server|server.*?(busy|unavailable|try again)|no servers available|filecode|kein filecode|empty.*?(form|response)/.test(s)) return 'hoster-transient';
+    if (/timeout|econnreset|enotfound|fetch failed|network|socket hang up|abort/.test(s)) return 'network';
+    return 'unknown';
+  }
+
+  function summarizeBatchErrors(batchSummary) {
+    const buckets = {
+      'file-rejected': [],
+      'account-error': [],
+      'hoster-transient': [],
+      'network': [],
+      'unknown': [],
+      'aborted': []
+    };
+    if (!batchSummary || !Array.isArray(batchSummary.files)) return buckets;
+    for (const f of batchSummary.files) {
+      if (!f || !Array.isArray(f.results)) continue;
+      for (const r of f.results) {
+        if (!r || r.status === 'done') continue;
+        const cat = classifyErrorCategory(r.error);
+        buckets[cat].push({
+          fileName: f.name || f.fileName || '',
+          hoster: r.hoster || '',
+          error: r.error || '',
+          jobId: r.jobId || null
+        });
+      }
+    }
+    return buckets;
+  }
+
+  const RETRYABLE_CATEGORIES = new Set(['hoster-transient', 'network', 'unknown']);
+  function isRetryableCategory(cat) {
+    return RETRYABLE_CATEGORIES.has(cat);
+  }
+
+  const CATEGORY_LABELS = {
+    'file-rejected': 'Datei abgelehnt',
+    'account-error': 'Account-Problem',
+    'hoster-transient': 'Hoster-Flake',
+    'network': 'Netzwerk',
+    'unknown': 'Unbekannt',
+    'aborted': 'Abgebrochen'
+  };
+
+  function formatLinks(rows, format) {
+    if (!Array.isArray(rows)) return '';
+    const safe = rows.filter(r => r && r.url);
+    if (safe.length === 0) return '';
+    switch (format) {
+      case 'plain':
+        return safe.map(r => r.url).join('\n');
+      case 'bbcode':
+        return safe.map(r => {
+          const label = r.fileName || r.hoster || r.url;
+          return `[url=${r.url}]${label}[/url]`;
+        }).join('\n');
+      case 'markdown':
+        return safe.map(r => {
+          const label = r.fileName || r.hoster || r.url;
+          return `- [${label}](${r.url})`;
+        }).join('\n');
+      case 'html':
+        return safe.map(r => {
+          const label = r.fileName || r.hoster || r.url;
+          return `<a href="${r.url}">${label}</a>`;
+        }).join('\n');
+      case 'csv': {
+        const head = 'fileName,hoster,url\n';
+        return head + safe.map(r => {
+          const esc = (v) => `"${String(v || '').replace(/"/g, '""')}"`;
+          return [esc(r.fileName), esc(r.hoster), esc(r.url)].join(',');
+        }).join('\n');
+      }
+      case 'json':
+        return JSON.stringify(safe.map(r => ({ fileName: r.fileName || '', hoster: r.hoster || '', url: r.url })), null, 2);
+      default:
+        return safe.map(r => r.url).join('\n');
+    }
+  }
+
+  const api = {
+    summarizePerHoster,
+    classifyErrorCategory,
+    summarizeBatchErrors,
+    isRetryableCategory,
+    RETRYABLE_CATEGORIES,
+    CATEGORY_LABELS,
+    formatLinks
+  };
+
+  if (typeof module !== 'undefined' && module.exports) {
+    module.exports = api;
+  } else if (root) {
+    root.Stats = api;
+  }
+})(typeof window !== 'undefined' ? window : this);
diff --git a/lib/upload-manager.js b/lib/upload-manager.js
index ce99002..5e8102f 100644
--- a/lib/upload-manager.js
+++ b/lib/upload-manager.js
@@ -66,6 +66,16 @@ class UploadManager extends EventEmitter {
     return this._accountOverrides.get(hoster) || null;
   }
 
+  clearFailedAccount(hoster, accountId) {
+    return this._failedAccounts.delete(`${hoster}:${accountId}`);
+  }
+
+  clearAllFailedAccounts() {
+    const n = this._failedAccounts.size;
+    this._failedAccounts.clear();
+    return n;
+  }
+
   // True if the hoster has a usable override stored that differs from the
   // account currently in the task and isn't itself already marked failed.
   // Used by the retry loop to decide "retry on same account vs break to
diff --git a/main.js b/main.js
index 78f6833..5b879ba 100644
--- a/main.js
+++ b/main.js
@@ -1575,6 +1575,33 @@ ipcMain.handle('finish-after-active', () => {
   return true;
 });
 
+ipcMain.handle('get-session-failed-accounts', () => {
+  return Array.from(_sessionFailedAccounts.keys());
+});
+
+ipcMain.handle('reset-session-failed-account', (_event, payload) => {
+  if (!payload || typeof payload !== 'object') return { ok: false };
+  const { hoster, accountId } = payload;
+  if (!hoster || !accountId) return { ok: false };
+  const key = `${hoster}:${accountId}`;
+  const removed = _sessionFailedAccounts.delete(key);
+  if (uploadManager && typeof uploadManager.clearFailedAccount === 'function') {
+    try { uploadManager.clearFailedAccount(hoster, accountId); } catch {}
+  }
+  rotLog(`session-failed: manual reset ${key} (was set: ${removed})`);
+  return { ok: true, removed };
+});
+
+ipcMain.handle('reset-all-session-failed-accounts', () => {
+  const count = _sessionFailedAccounts.size;
+  _sessionFailedAccounts.clear();
+  if (uploadManager && typeof uploadManager.clearAllFailedAccounts === 'function') {
+    try { uploadManager.clearAllFailedAccounts(); } catch {}
+  }
+  rotLog(`session-failed: cleared all (${count})`);
+  return { ok: true, count };
+});
+
 ipcMain.handle('get-job-log', (_event, jobId) => {
   if (!jobId || typeof jobId !== 'string') return [];
   const arr = _jobLogCollector.get(jobId);
diff --git a/preload.js b/preload.js
index 8eb10a6..c3e6446 100644
--- a/preload.js
+++ b/preload.js
@@ -110,6 +110,9 @@ contextBridge.exposeInMainWorld('api', {
   },
   openLogFolder: () => ipcRenderer.invoke('open-log-folder'),
   getJobLog: (jobId) => ipcRenderer.invoke('get-job-log', jobId),
+  getSessionFailedAccounts: () => ipcRenderer.invoke('get-session-failed-accounts'),
+  resetSessionFailedAccount: (payload) => ipcRenderer.invoke('reset-session-failed-account', payload),
+  resetAllSessionFailedAccounts: () => ipcRenderer.invoke('reset-all-session-failed-accounts'),
   getLogPaths: () => ipcRenderer.invoke('get-log-paths'),
   revealLogFile: (target) => ipcRenderer.invoke('reveal-log-file', target),
   setLogVerbose: (enabled) => ipcRenderer.invoke('set-log-verbose', enabled),
diff --git a/renderer/app.js b/renderer/app.js
index a2b112a..61b75cb 100644
--- a/renderer/app.js
+++ b/renderer/app.js
@@ -92,6 +92,7 @@ async function init() {
   setupDragDrop();
   restoreQueueColumnWidths();
   loadHistory();
+  _refreshSessionFailedSnapshot();
   renderRecentUploadsPanel();
   updateUploadView();
   updateStatusBar();
@@ -2056,6 +2057,85 @@ function handleBatchDone(summary) {
 
   lastUploadStats = { state: 'idle', globalSpeedKbs: 0, totalBytes: lastUploadStats.totalBytes, elapsed: lastUploadStats.elapsed, activeJobs: 0 };
   updateStatusBar();
+  _maybeShowBatchSummary(summary);
+  _refreshSessionFailedSnapshot();
+}
+
+let _sessionFailedKeys = new Set();
+async function _refreshSessionFailedSnapshot() {
+  if (!window.api || !window.api.getSessionFailedAccounts) return;
+  try {
+    const keys = await window.api.getSessionFailedAccounts();
+    _sessionFailedKeys = new Set(Array.isArray(keys) ? keys : []);
+    renderAccounts();
+  } catch { /* ignore */ }
+}
+
+function _maybeShowBatchSummary(summary) {
+  if (!window.Stats || !summary) return;
+  const buckets = window.Stats.summarizeBatchErrors(summary);
+  const total = Object.values(buckets).reduce((n, arr) => n + arr.length, 0);
+  if (total === 0) return;
+
+  const modal = document.getElementById('batchSummaryModal');
+  if (!modal) return;
+  const list = modal.querySelector('#batchSummaryList');
+  const retryAllBtn = modal.querySelector('#batchSummaryRetryAll');
+  const retryTransientBtn = modal.querySelector('#batchSummaryRetryTransient');
+  const closeBtn = modal.querySelector('#batchSummaryClose');
+
+  const order = ['hoster-transient', 'network', 'unknown', 'file-rejected', 'account-error', 'aborted'];
+  list.innerHTML = order
+    .filter(cat => buckets[cat].length > 0)
+    .map(cat => {
+      const items = buckets[cat];
+      const sample = items.slice(0, 3).map(i => `<li>${escapeHtml(i.fileName)} → ${escapeHtml(i.hoster)}: <em>${escapeHtml(i.error)}</em></li>`).join('');
+      const more = items.length > 3 ? `<li><em>… +${items.length - 3} weitere</em></li>` : '';
+      const retryable = window.Stats.isRetryableCategory(cat);
+      const tag = retryable ? '<span class="batch-cat-tag retryable">erneut versuchbar</span>' : '<span class="batch-cat-tag">manuell</span>';
+      return `<div class="batch-cat" data-category="${escapeAttr(cat)}">
+        <div class="batch-cat-head"><strong>${escapeHtml(window.Stats.CATEGORY_LABELS[cat] || cat)}</strong> <span class="batch-cat-count">${items.length}</span> ${tag}</div>
+        <ul class="batch-cat-list">${sample}${more}</ul>
+      </div>`;
+    }).join('');
+
+  const transientCount = ['hoster-transient', 'network', 'unknown'].reduce((n, c) => n + buckets[c].length, 0);
+  retryTransientBtn.textContent = transientCount > 0 ? `Transiente erneut hochladen (${transientCount})` : 'Keine transienten Fehler';
+  retryTransientBtn.disabled = transientCount === 0;
+  const allRetryable = total - buckets['aborted'].length;
+  retryAllBtn.textContent = `Alle Fehler erneut versuchen (${allRetryable})`;
+  retryAllBtn.disabled = allRetryable === 0;
+
+  const close = () => { modal.style.display = 'none'; };
+  closeBtn.onclick = close;
+  retryAllBtn.onclick = () => { _retryFailedFromBuckets(buckets, false); close(); };
+  retryTransientBtn.onclick = () => { _retryFailedFromBuckets(buckets, true); close(); };
+  modal.style.display = 'flex';
+}
+
+function _retryFailedFromBuckets(buckets, transientOnly) {
+  const cats = transientOnly ? ['hoster-transient', 'network', 'unknown'] : ['hoster-transient', 'network', 'unknown', 'file-rejected', 'account-error'];
+  const toRetry = [];
+  for (const cat of cats) {
+    for (const item of (buckets[cat] || [])) toRetry.push(item);
+  }
+  if (toRetry.length === 0) return;
+  const jobsToRetry = [];
+  for (const item of toRetry) {
+    const job = queueJobs.find(j => (j.fileName === item.fileName) && (j.hoster === item.hoster) && (j.status === 'error' || j.status === 'skipped'));
+    if (job) {
+      job.status = 'queued';
+      job.progress = 0;
+      job.bytesUploaded = 0;
+      job.error = null;
+      job.result = null;
+      jobsToRetry.push(job);
+    }
+  }
+  if (jobsToRetry.length === 0) { showCopyToast('Keine passenden Jobs für Retry gefunden.'); return; }
+  renderQueueTable();
+  showCopyToast(`${jobsToRetry.length} Job(s) zum erneuten Upload zurückgesetzt`);
+  if (typeof startUpload === 'function') startUpload();
 }
 
 function handleStats(data) {
@@ -3118,11 +3198,16 @@ function _buildAccountCardHtml(name, account, idx) {
   const toggleLabel = isDisabled ? 'Aktivieren' : 'Deaktivieren';
   const priorityLabel = idx === 0 ? 'Primär' : `Fallback #${idx}`;
 
+  const isSessionPaused = _sessionFailedKeys.has(`${name}:${account.id}`);
+  const sessionPausedBadge = isSessionPaused
+    ? `<span class="account-session-paused" title="Account wurde diese Session als fehlerhaft markiert. Klick = Wieder als aktiv markieren.">Pausiert (Session) <button class="account-session-reactivate" data-account-reactivate="${account.id}" data-account-reactivate-hoster="${name}" title="Wieder aktivieren">↻</button></span>`
+    : '';
+
   return `
-    <div class="account-card${isDisabled ? ' account-disabled' : ''}" data-account-id="${account.id}" data-account-hoster="${name}" draggable="true">
+    <div class="account-card${isDisabled ? ' account-disabled' : ''}${isSessionPaused ? ' account-session-paused-card' : ''}" data-account-id="${account.id}" data-account-hoster="${name}" draggable="true">
       <div class="account-card-drag-handle" title="Ziehen zum Sortieren">&#9776;</div>
       <div class="account-card-info">
-        <div class="account-card-title">${escapeHtml(getAccountDisplayName(name, account))} <span class="account-priority-badge">${priorityLabel}</span></div>
+        <div class="account-card-title">${escapeHtml(getAccountDisplayName(name, account))} <span class="account-priority-badge">${priorityLabel}</span> ${sessionPausedBadge}</div>
         <div class="account-card-subtitle" title="${escapeAttr(subtitleText)}">${escapeHtml(subtitleText)}${st.message && !isDisabled ? ` • ${escapeHtml(st.message)}` : ''}</div>
       </div>
       <span class="account-status status-${statusClass}">
@@ -3267,6 +3352,10 @@ function _buildAccountHosterGroupHtml(name, accounts) {
   let cardsHtml = '';
   accounts.forEach((account, idx) => { cardsHtml += _buildAccountCardHtml(name, account, idx); });
   const bodyStyle = isOpen ? '' : 'style="display:none"';
+  const lifeStat = _hosterLifetimeStat(name);
+  const lifeMeta = lifeStat && lifeStat.total > 0
+    ? `<span class="account-hoster-group-meta" title="Erfolgsrate aus den letzten ${lifeStat.total} Uploads dieses Hosters">${Math.round(lifeStat.rate * 100)}% ok (${lifeStat.total})</span>`
+    : '';
   return `<div class="account-hoster-group" data-hoster-group="${name}">
     <div class="account-hoster-group-header" data-hoster-toggle="${name}">
       <span class="panel-arrow">${arrow}</span>
@@ -3275,11 +3364,21 @@ function _buildAccountHosterGroupHtml(name, accounts) {
       <span class="account-hoster-group-count">${countLabel}</span>
       ${summary.disabled ? `<span class="account-hoster-group-meta">${summary.disabled} deaktiviert</span>` : ''}
       ${summary.error ? `<span class="account-hoster-group-meta error">${summary.error} Fehler</span>` : ''}
+      ${lifeMeta}
     </div>
     <div class="account-hoster-group-body" ${bodyStyle}>${cardsHtml}</div>
   </div>`;
 }
 
+let _hosterLifetimeCache = null;
+function _hosterLifetimeStat(name) {
+  if (!_hosterLifetimeCache && window.Stats && Array.isArray(window._historyForStats)) {
+    _hosterLifetimeCache = window.Stats.summarizePerHoster(window._historyForStats, { lastNBatches: 50 });
+  }
+  return _hosterLifetimeCache ? _hosterLifetimeCache[name] : null;
+}
+function _invalidateHosterLifetimeCache() { _hosterLifetimeCache = null; }
+
 // Single set of delegated listeners on the accounts container. Bound once on
 // the first render and reused for every subsequent in-place update / card
 // swap. Previously we rebound 4 × N button listeners + 5 × N drag listeners
@@ -3309,6 +3408,18 @@ function bindAccountListeners(container) {
     if (btn.dataset.accountEdit) return openAccountModal(btn.dataset.accountEdit);
     if (btn.dataset.accountDelete) return openDeleteAccountModal(btn.dataset.accountDelete);
     if (btn.dataset.accountCheck) return checkSingleAccount(btn.dataset.accountCheck);
+    if (btn.dataset.accountReactivate) {
+      const accountId = btn.dataset.accountReactivate;
+      const hoster = btn.dataset.accountReactivateHoster;
+      if (!hoster || !accountId) return;
+      e.stopPropagation();
+      window.api.resetSessionFailedAccount({ hoster, accountId }).then(() => {
+        _sessionFailedKeys.delete(`${hoster}:${accountId}`);
+        renderAccounts();
+        showCopyToast(`${getHosterLabel(hoster)} Account wieder aktiv — nächste Batch verwendet ihn`);
+      }).catch(() => {});
+      return;
+    }
   });
 
   let draggedCard = null;
@@ -3798,6 +3909,8 @@ function _hideOtpField() {
 // --- History ---
 async function loadHistory() {
   const history = await window.api.getHistory();
+  window._historyForStats = history || [];
+  _invalidateHosterLifetimeCache();
   const container = document.getElementById('historyContainer');
 
   if (!history || history.length === 0) {
@@ -4385,14 +4498,20 @@ async function importUploadLog() {
 
 // --- Link operations ---
 function copyAllLinks() {
-  const links = queueJobs
+  const rows = queueJobs
     .filter(j => j.status === 'done' && j.result)
-    .map(j => j.result.download_url || j.result.embed_url || '')
-    .filter(Boolean);
-  if (links.length > 0) {
-    window.api.copyToClipboard(links.join('\n'));
-    showCopyToast(`${links.length} Links kopiert`);
-  }
+    .map(j => ({
+      fileName: j.fileName || '',
+      hoster: j.hoster || '',
+      url: j.result.download_url || j.result.embed_url || ''
+    }))
+    .filter(r => r.url);
+  if (rows.length === 0) return;
+  const formatEl = document.getElementById('linkExportFormat');
+  const fmt = (formatEl && formatEl.value) || 'plain';
+  const text = window.Stats ? window.Stats.formatLinks(rows, fmt) : rows.map(r => r.url).join('\n');
+  window.api.copyToClipboard(text);
+  showCopyToast(`${rows.length} Link${rows.length === 1 ? '' : 's'} als ${fmt.toUpperCase()} kopiert`);
 }
 
 // --- Utilities ---
diff --git a/renderer/index.html b/renderer/index.html
index b894f80..7805fd1 100644
--- a/renderer/index.html
+++ b/renderer/index.html
@@ -93,6 +93,14 @@
 
         <div class="queue-actions" id="queueActions" style="display:none">
           <button class="btn btn-xs btn-primary" id="copyAllLinksBtn">Alle Links kopieren</button>
+          <select class="hs-input" id="linkExportFormat" title="Ausgabe-Format der kopierten Links" style="max-width:none;width:auto;min-width:130px">
+            <option value="plain">Plaintext</option>
+            <option value="bbcode">BBCode</option>
+            <option value="markdown">Markdown</option>
+            <option value="html">HTML</option>
+            <option value="csv">CSV</option>
+            <option value="json">JSON</option>
+          </select>
           <button class="btn btn-xs btn-secondary" id="retryFailedBtn" style="display:none">Fehlgeschlagene erneut</button>
           <button class="btn btn-xs btn-secondary" id="importLogBtn" title="Log importieren — bereits hochgeladene aus Queue entfernen">Log importieren</button>
         </div>
@@ -334,9 +342,26 @@
     </div>
   </div>
 
+  <div class="modal" id="batchSummaryModal" style="display:none">
+    <div class="modal-content" style="max-width:680px">
+      <div class="modal-header">
+        <h2>Batch-Zusammenfassung</h2>
+        <button class="icon-btn" id="batchSummaryClose" aria-label="Schließen">&times;</button>
+      </div>
+      <div class="modal-body">
+        <div id="batchSummaryList"></div>
+      </div>
+      <div class="modal-footer">
+        <button class="btn btn-secondary" id="batchSummaryRetryTransient">Transiente erneut hochladen</button>
+        <button class="btn btn-primary" id="batchSummaryRetryAll">Alle Fehler erneut versuchen</button>
+      </div>
+    </div>
+  </div>
+
   <script src="../lib/queue-prune.js"></script>
   <script src="../lib/queue-dedup.js"></script>
   <script src="../lib/log-mode.js"></script>
+  <script src="../lib/stats.js"></script>
   <script src="../lib/throttled-cache.js"></script>
   <script src="../lib/coalesced-set.js"></script>
   <script src="app.js"></script>
diff --git a/renderer/styles.css b/renderer/styles.css
index d5bee46..13af7ac 100644
--- a/renderer/styles.css
+++ b/renderer/styles.css
@@ -916,6 +916,40 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
   color: var(--danger, #e57373);
   background: rgba(229, 115, 115, 0.12);
 }
+.account-session-paused {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  font-size: 10px;
+  color: #f0c36c;
+  background: rgba(240, 195, 108, 0.12);
+  padding: 1px 6px;
+  border-radius: 4px;
+  margin-left: 6px;
+}
+.account-session-reactivate {
+  background: none;
+  border: none;
+  color: inherit;
+  cursor: pointer;
+  font-size: 12px;
+  line-height: 1;
+  padding: 0 2px;
+}
+.account-session-reactivate:hover { color: #fff; }
+.account-session-paused-card { opacity: 0.85; }
+.batch-cat {
+  margin-bottom: 10px;
+  padding: 6px 8px;
+  border-radius: 6px;
+  background: rgba(255,255,255,0.03);
+}
+.batch-cat-head { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; font-size: 13px; }
+.batch-cat-count { color: var(--text-muted); font-variant-numeric: tabular-nums; }
+.batch-cat-tag { font-size: 10px; padding: 1px 6px; border-radius: 4px; background: rgba(255,255,255,0.06); color: var(--text-muted); }
+.batch-cat-tag.retryable { background: rgba(76, 175, 80, 0.18); color: #a5d6a7; }
+.batch-cat-list { margin: 0; padding-left: 18px; font-size: 11px; color: var(--text-muted); }
+.batch-cat-list em { color: var(--text-muted); font-style: italic; }
 .account-hoster-group-body {
   padding: 8px;
   border-top: 1px solid var(--border);
diff --git a/tests/stats.test.js b/tests/stats.test.js
new file mode 100644
index 0000000..2dd4dab
--- /dev/null
+++ b/tests/stats.test.js
@@ -0,0 +1,132 @@
+const test = require('node:test');
+const assert = require('node:assert');
+const {
+  summarizePerHoster,
+  classifyErrorCategory,
+  summarizeBatchErrors,
+  isRetryableCategory
+} = require('../lib/stats');
+
+function makeBatch(timestamp, results) {
+  return {
+    id: 'b-' + timestamp,
+    timestamp: new Date(timestamp).toISOString(),
+    files: [{ name: 'foo.mp4', size: 1, results }]
+  };
+}
+
+test('summarizePerHoster counts ok and fail per hoster across all batches', () => {
+  const history = [
+    makeBatch(1, [
+      { hoster: 'voe.sx', status: 'done' },
+      { hoster: 'byse.sx', status: 'error', error: 'Not video file format' }
+    ]),
+    makeBatch(2, [
+      { hoster: 'voe.sx', status: 'done' },
+      { hoster: 'voe.sx', status: 'error', error: 'CSRF' },
+      { hoster: 'byse.sx', status: 'done' }
+    ])
+  ];
+  const s = summarizePerHoster(history);
+  assert.strictEqual(s['voe.sx'].ok, 2);
+  assert.strictEqual(s['voe.sx'].fail, 1);
+  assert.strictEqual(s['voe.sx'].total, 3);
+  assert.strictEqual(Math.round(s['voe.sx'].rate * 100), 67);
+  assert.strictEqual(s['byse.sx'].ok, 1);
+  assert.strictEqual(s['byse.sx'].fail, 1);
+  assert.strictEqual(s['byse.sx'].rate, 0.5);
+});
+
+test('summarizePerHoster honors sinceMs cutoff', () => {
+  const history = [
+    makeBatch(1000, [{ hoster: 'voe.sx', status: 'done' }]),
+    makeBatch(5000, [{ hoster: 'voe.sx', status: 'error', error: 'x' }])
+  ];
+  const s = summarizePerHoster(history, { sinceMs: 3000 });
+  assert.strictEqual(s['voe.sx'].ok, 0);
+  assert.strictEqual(s['voe.sx'].fail, 1);
+});
+
+test('summarizePerHoster honors lastNBatches (newest first)', () => {
+  const history = [
+    makeBatch(1000, [{ hoster: 'voe.sx', status: 'done' }]),
+    makeBatch(2000, [{ hoster: 'voe.sx', status: 'done' }]),
+    makeBatch(3000, [{ hoster: 'voe.sx', status: 'error', error: 'x' }])
+  ];
+  const s = summarizePerHoster(history, { lastNBatches: 1 });
+  assert.strictEqual(s['voe.sx'].ok, 0);
+  assert.strictEqual(s['voe.sx'].fail, 1);
+});
+
+test('summarizePerHoster handles empty / malformed input', () => {
+  assert.deepStrictEqual(summarizePerHoster(null), {});
+  assert.deepStrictEqual(summarizePerHoster([]), {});
+  assert.deepStrictEqual(summarizePerHoster([{ id: 'x', files: null }]), {});
+});
+
+test('classifyErrorCategory: file-rejected phrases', () => {
+  assert.strictEqual(classifyErrorCategory('Byse lehnte Datei ab: Not video file format'), 'file-rejected');
+  assert.strictEqual(classifyErrorCategory('Duplicate file already exists'), 'file-rejected');
+  assert.strictEqual(classifyErrorCategory('Datei zu groß (Max: 5 GB)'), 'file-rejected');
+});
+
+test('classifyErrorCategory: account-error phrases', () => {
+  assert.strictEqual(classifyErrorCategory('Quota exceeded'), 'account-error');
+  assert.strictEqual(classifyErrorCategory('account banned'), 'account-error');
+  assert.strictEqual(classifyErrorCategory('not enough disk space'), 'account-error');
+});
+
+test('classifyErrorCategory: hoster-transient phrases', () => {
+  assert.strictEqual(classifyErrorCategory('CSRF-Token nicht gefunden'), 'hoster-transient');
+  assert.strictEqual(classifyErrorCategory('Kein Upload-Server erhalten: server busy'), 'hoster-transient');
+  assert.strictEqual(classifyErrorCategory('Kein Filecode'), 'hoster-transient');
+});
+
+test('classifyErrorCategory: network phrases', () => {
+  assert.strictEqual(classifyErrorCategory('socket hang up'), 'network');
+  assert.strictEqual(classifyErrorCategory('fetch failed'), 'network');
+  assert.strictEqual(classifyErrorCategory('Timeout while reading'), 'network');
+});
+
+test('classifyErrorCategory: aborted is its own bucket (not retryable)', () => {
+  assert.strictEqual(classifyErrorCategory('Abgebrochen'), 'aborted');
+  assert.strictEqual(isRetryableCategory('aborted'), false);
+});
+
+test('classifyErrorCategory: unknown for everything else', () => {
+  assert.strictEqual(classifyErrorCategory(''), 'unknown');
+  assert.strictEqual(classifyErrorCategory(null), 'unknown');
+  assert.strictEqual(classifyErrorCategory('Some weird thing'), 'unknown');
+});
+
+test('summarizeBatchErrors buckets results by category', () => {
+  const summary = {
+    files: [
+      { name: 'a.mp4', results: [
+        { hoster: 'voe.sx', status: 'done' },
+        { hoster: 'byse.sx', status: 'error', error: 'Not video file format' }
+      ] },
+      { name: 'b.mp4', results: [
+        { hoster: 'voe.sx', status: 'error', error: 'CSRF' },
+        { hoster: 'doodstream.com', status: 'error', error: 'socket hang up' }
+      ] }
+    ]
+  };
+  const buckets = summarizeBatchErrors(summary);
+  assert.strictEqual(buckets['file-rejected'].length, 1);
+  assert.strictEqual(buckets['file-rejected'][0].hoster, 'byse.sx');
+  assert.strictEqual(buckets['hoster-transient'].length, 1);
+  assert.strictEqual(buckets['hoster-transient'][0].hoster, 'voe.sx');
+  assert.strictEqual(buckets['network'].length, 1);
+  assert.strictEqual(buckets['network'][0].hoster, 'doodstream.com');
+  assert.strictEqual(buckets['account-error'].length, 0);
+});
+
+test('isRetryableCategory: only transient + network + unknown retry-worthy', () => {
+  assert.strictEqual(isRetryableCategory('hoster-transient'), true);
+  assert.strictEqual(isRetryableCategory('network'), true);
+  assert.strictEqual(isRetryableCategory('unknown'), true);
+  assert.strictEqual(isRetryableCategory('file-rejected'), false);
+  assert.strictEqual(isRetryableCategory('account-error'), false);
+  assert.strictEqual(isRetryableCategory('aborted'), false);
+});