34 changed files with 688 additions and 2523 deletions
--- a/.gitignore
+++ b/.gitignore
@ -6,10 +6,7 @@ __pycache__/
 electron-config.json
 electron-config.json.bak
 electron-config.json.tmp
-electron-config.json.pre-history-split.bak
 electron-config.pre-import-*.json
-electron-history.json
-electron-history.json.tmp
 *.log
 debug.log
 fileuploader.log
--- a/docs/superpowers/plans/2026-08-07-v2-account-manager-startup.md
+++ b/docs/superpowers/plans/2026-08-07-v2-account-manager-startup.md
@ -1,208 +0,0 @@
-# V2.0.1 Account Manager und Startup Implementation Plan
-
-> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
-
-**Goal:** Einen atomaren Ein-Klick-Account-Flow, einen deterministischen White-Screen-sicheren Start und eine funktionierende Update-Brücke von 3.3.108 auf die sichtbare Version 2.0.1 liefern.
-
-**Architecture:** Browserunabhängige Kernlogik kapselt Validate-then-Commit und Release-Versionsauflösung und wird vom bestehenden Renderer beziehungsweise Updater verwendet. Der Electron-Main-Prozess erzwingt Software-Rendering vor Ready und zeigt das Hauptfenster erst nach `ready-to-show`.
-
-**Tech Stack:** Electron 41, Node.js 24, `node:test`, electron-builder 26, Gitea Releases, GitHub Releases.
-
-## Global Constraints
-
- Keine Code-Kommentare, XML-Dokumentation, TODOs oder Platzhalter hinzufügen.
- Sichtbare Produktversion, UI, Build und öffentlicher GitHub-Tag sind exakt `2.0.1` beziehungsweise `v2.0.1`.
- Der private Gitea-Transport-Tag für diese Version ist exakt `v3.3.109`; der Release-Titel ist exakt `Multi-Hoster-Upload v2.0.1`.
- Fehlgeschlagene, abgebrochene, veraltete oder OTP-erfordernde Prüfungen persistieren keinen Account.
- Release nur aus frischer Positivliste, ohne interne KI-/Task-/Log-/Backup-/Testdaten und nach Quell-, Build-, Archiv- und Secret-Prüfung.
-
---
-
-### Task 1: Startup-Renderer absichern
-
-**Files:**
- Create: `lib/startup-renderer.js`
- Modify: `main.js`
- Create: `tests/startup-renderer.test.js`
-
-**Interfaces:**
- Produces: `configureStartupRenderer(app)` deaktiviert Hardwarebeschleunigung genau einmal vor Ready.
- Produces: `createWindow()` erstellt das Hauptfenster unsichtbar und zeigt es auf `ready-to-show`.
-
- [ ] **Step 1: Failing Tests schreiben**
-
-```js
-test('configureStartupRenderer disables hardware acceleration', () => {
-  let calls = 0;
-  configureStartupRenderer({ disableHardwareAcceleration() { calls++; } });
-  assert.equal(calls, 1);
-});
-```
-
- [ ] **Step 2: RED verifizieren**
-
-Run: `node --test tests/startup-renderer.test.js`
-
-Expected: FAIL, weil `lib/startup-renderer.js` noch fehlt.
-
- [ ] **Step 3: Minimale Implementierung schreiben**
-
-```js
-function configureStartupRenderer(app) {
-  app.disableHardwareAcceleration();
-}
-
-module.exports = { configureStartupRenderer };
-```
-
-`main.js` ruft die Funktion unmittelbar nach dem Electron-Import auf, entfernt das heuristische RDP-/Flag-Gate, setzt `show: false`, registriert `ready-to-show` vor `loadFile` und behandelt einen abgelehnten Load.
-
- [ ] **Step 4: GREEN und Startup-Smoke verifizieren**
-
-Run: `node --test tests/startup-renderer.test.js`
-
-Run: `$env:RUN_UI_SMOKE='1'; node tests/ui-smoke.js`
-
- [ ] **Step 5: Commit erstellen**
-
-```powershell
-git add lib/startup-renderer.js main.js tests/startup-renderer.test.js
-git commit -m "fix(startup): make renderer initialization deterministic"
-```
-
-### Task 2: Account in einem Lauf prüfen und anlegen
-
-**Files:**
- Create: `renderer/account-submit.js`
- Modify: `renderer/index.html`
- Modify: `renderer/app.js`
- Replace: `tests/validate-credentials.test.js`
-
-**Interfaces:**
- Produces: `submitValidatedAccount({ validate, commit, isCurrent })` mit den Resultaten `committed`, `rejected`, `otp_required`, `stale` und `error`.
- Consumes: bestehendes `window.api.validateCredentials` und `window.api.saveConfig`.
-
- [ ] **Step 1: Failing Tests für Ein-Klick- und Fehlerpfade schreiben**
-
-```js
-test('ok validates and commits exactly once in one submission', async () => {
-  let commits = 0;
-  const result = await submitValidatedAccount({
-    validate: async () => ({ status: 'ok' }),
-    commit: async () => { commits++; },
-    isCurrent: () => true
-  });
-  assert.equal(result.status, 'committed');
-  assert.equal(commits, 1);
-});
-```
-
-Zusätzliche Tests decken `warn`, `error`, `skipped`, Throw, OTP, stale vor Commit und Save-Fehler ab.
-
- [ ] **Step 2: RED verifizieren**
-
-Run: `node --test tests/validate-credentials.test.js`
-
-Expected: FAIL, weil `submitValidatedAccount` noch fehlt.
-
- [ ] **Step 3: Submit-Core und Renderer-Integration implementieren**
-
-Der Submit-Core validiert, prüft `isCurrent`, committet ausschließlich `ok|warn` und gibt strukturierte Ergebnisse zurück. `saveAccount()` hält Busy bis zum Ende, vergleicht Session und Credential-Snapshot, speichert einen kopierten Kandidaten und übernimmt ihn erst nach erfolgreichem IPC. Der Button bleibt bis zum Schließen deaktiviert.
-
- [ ] **Step 4: GREEN und UI-Vertrag verifizieren**
-
-Run: `node --test tests/validate-credentials.test.js`
-
-Run: `node --test tests/*.test.js`
-
-Run: `$env:RUN_UI_SMOKE='1'; node tests/ui-smoke.js`
-
- [ ] **Step 5: Commit erstellen**
-
-```powershell
-git add renderer/account-submit.js renderer/index.html renderer/app.js tests/validate-credentials.test.js
-git commit -m "feat(accounts): validate and save in one action"
-```
-
-### Task 3: Produktversion und Updater-Brücke implementieren
-
-**Files:**
- Modify: `lib/updater.js`
- Modify: `scripts/release_gitea.mjs`
- Modify: `package.json`
- Modify: `package-lock.json`
- Create: `tests/updater-version.test.js`
-
-**Interfaces:**
- Produces: `resolveReleaseVersion(release)` liest zuerst eine semantische Version aus `release.name`, dann aus `tag_name`.
- Produces: Release-CLI `node scripts/release_gitea.mjs 2.0.1 --transport-tag v3.3.109 <notes>`.
-
- [ ] **Step 1: Failing Tests für Release-Auflösung und Bridge schreiben**
-
-```js
-test('bridge title resolves product version instead of transport tag', () => {
-  assert.equal(resolveReleaseVersion({ name: 'Multi-Hoster-Upload v2.0.1', tag_name: 'v3.3.109' }), '2.0.1');
-  assert.equal(isNewer('2.0.1', '2.0.1'), false);
-  assert.equal(isNewer('2.0.2', '2.0.1'), true);
-});
-```
-
- [ ] **Step 2: RED verifizieren**
-
-Run: `node --test tests/updater-version.test.js`
-
-Expected: FAIL, weil `resolveReleaseVersion` noch fehlt.
-
- [ ] **Step 3: Produkt-/Transport-Trennung implementieren**
-
-`checkForUpdate()` verwendet die aufgelöste Produktversion für UI und Vergleich. Der Transport-Tag bleibt im Ergebnis diagnostizierbar. Das Release-Skript validiert `--transport-tag`, baut `2.0.1`, taggt `v3.3.109`, benennt den privaten Release `Multi-Hoster-Upload v2.0.1` und erzeugt `latest.yml` mit `2.0.1`.
-
- [ ] **Step 4: Version auf 2.0.1 setzen und GREEN verifizieren**
-
-Run: `npm version 2.0.1 --no-git-tag-version`
-
-Run: `node --test tests/updater-version.test.js`
-
-Run: `npm test`
-
- [ ] **Step 5: Commit erstellen**
-
-```powershell
-git add lib/updater.js scripts/release_gitea.mjs package.json package-lock.json tests/updater-version.test.js
-git commit -m "feat(updater): bridge 3.3.108 clients to v2.0.1"
-```
-
-### Task 4: Build, Laufzeit und Veröffentlichung verifizieren
-
-**Files:**
- Modify: `tasks/todo.md`
-
-**Interfaces:**
- Consumes: Tasks 1 bis 3.
- Produces: geprüfte private Bridge und kuratierten öffentlichen Release v2.0.1.
-
- [ ] **Step 1: Vollständige lokale Gates ausführen**
-
-Run: `npm test`
-
-Run: `npx eslint .`
-
-Run: `npm audit --omit=dev --json`
-
-Run: `npm run release:win`
-
- [ ] **Step 2: Build und Archive prüfen**
-
-Portable, Setup, Blockmap und `latest.yml` werden vollständig entpackt, auf Version, Struktur, Hashes, private Endpunkte, Credentials und interne Dateien geprüft. Gitleaks und TruffleHog laufen über Quell-Positivliste und entpackte Artefakte.
-
- [ ] **Step 3: Update-Brücke isoliert testen**
-
-Ein unveränderter 3.3.108-Updater muss den privaten Transport-Tag `v3.3.109` als neuer erkennen. Der gebaute 2.0.1-Updater muss denselben Release-Titel als installiert erkennen. Setup und Portable werden separat gestartet; UI, Account-Modal und sauberer Teardown werden geprüft.
-
- [ ] **Step 4: Private und öffentliche Releases veröffentlichen**
-
-Der private Gitea-Release nutzt Transport-Tag `v3.3.109` und Titel `Multi-Hoster-Upload v2.0.1`. Der öffentliche GitHub-Release wird aus einem neuen Positivlisten-Ordner als `v2.0.1` mit ausschließlich benötigtem Source und vier Release-Artefakten erstellt.
-
- [ ] **Step 5: Veröffentlichte Downloads erneut verifizieren**
-
-Alle öffentlichen und privaten Assets werden neu heruntergeladen, byte- und hashverglichen, `latest.yml` wird gegen das Setup geprüft und der veröffentlichte Build wird erneut gestartet. Erst danach wird `tasks/todo.md` mit den exakten Belegen aktualisiert.
--- a/docs/superpowers/specs/2026-08-07-v2-account-manager-startup-design.md
+++ b/docs/superpowers/specs/2026-08-07-v2-account-manager-startup-design.md
@ -1,25 +0,0 @@
-# V2.0.1 Account Manager und Startup
-
-## Ziel
-
-Multi-Hoster-Upload wird als sichtbare Produktversion `2.0.1` ausgeliefert. Das Hinzufügen und Bearbeiten eines Accounts validiert und speichert in einem Klick. Ein fehlgeschlagener, abgebrochener oder veralteter Check verändert weder die persistierte noch die im Renderer gehaltene Account-Konfiguration. Der intermittierende weiße Startzustand wird durch einen deterministischen Software-Renderer und ein erst nach erfolgreichem Laden sichtbares Hauptfenster verhindert.
-
-## Account-Flow
-
-Der Button lautet im Anlegefall `Prüfen und anlegen`, im Bearbeitungsfall `Prüfen und speichern`. Der bestehende Credential-Check bleibt die einzige fachliche Validierung. `ok` und `warn` führen unmittelbar zum Save, `error`, `skipped`, IPC-Fehler und `otp_required` nicht. OTP zeigt das Eingabefeld; der nächste Klick validiert und speichert in einem Lauf.
-
-Ein einziger Busy-Zustand umfasst Check und Save. Vor dem Save werden Modal-Session, Hoster, Account-ID und Credential-Snapshot erneut abgeglichen. Hoster- oder Credential-Änderung, Schließen oder erneutes Öffnen invalidieren die laufende Operation. Der Kandidat wird auf einer Kopie der Hoster-Konfiguration aufgebaut. Erst nach erfolgreichem `saveConfig` ersetzt er den Renderer-State. Bei Save-Fehler bleibt das Modal offen und der bisherige State unverändert.
-
-## Startup
-
-Die App benötigt keine GPU-beschleunigten Canvas-, WebGL- oder Video-Oberflächen. Hardwarebeschleunigung wird deshalb bei jedem Start vor `app.whenReady()` deaktiviert, unabhängig von `SESSIONNAME` und einem späteren GPU-Crash. Das Hauptfenster startet mit `show: false`, wird auf `ready-to-show` eingeblendet und wertet das Promise von `loadFile` aus. Load- und Renderer-Fehler bleiben sichtbar diagnostizierbar.
-
-## Versions- und Update-Brücke
-
-`package.json`, UI, Installer-Metadaten und öffentliche GitHub-Version lauten `2.0.1` beziehungsweise `v2.0.1`. Der ausgelieferte 3.3.108-Client vergleicht den privaten Gitea-Tag numerisch und würde einen Tag `v2.0.1` ablehnen. Außerdem existiert dort bereits ein historischer Tag `v2.0.1`.
-
-Der private Updater-Transport verwendet deshalb für diese Veröffentlichung den neuen internen Tag `v3.3.109`, während Release-Titel und Build `v2.0.1` anzeigen. Der neue Updater liest die Produktversion aus dem Release-Titel und fällt nur bei fehlender Produktversion auf den Tag zurück. Dadurch sieht 3.3.108 den höheren Transport-Tag, während 2.0.1 denselben Release anhand des Titels als bereits installiert erkennt. Künftige 2.x-Releases verwenden fortlaufende interne Transport-Tags oberhalb 3.3.108 und sichtbare 2.x-Titel.
-
-## Verifikation
-
-Regressionsfälle prüfen den real verwendeten Account-Submit-Core, die Startup-Konfiguration und die Produkt-/Transport-Versionsauflösung. Danach folgen vollständige Unit-Tests, UI-Smoke, wiederholte reale Starts, Windows-Build, entpackte Artefaktprüfung, Secret-Scans, isolierter Installer-/Updater-Test und erst anschließend die kuratierten privaten und öffentlichen Releases mit erneutem Download und Hashvergleich.
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@ -55,7 +55,6 @@ const nodeGlobals = {
  fetch: 'readonly',
  crypto: 'readonly',
  structuredClone: 'readonly',
-  performance: 'readonly',
 };

 export default [
--- a/lib/clouddrop-upload.js
+++ b/lib/clouddrop-upload.js
@ -105,7 +105,7 @@ class ClouddropUploader {
    let bytesRead = 0;
    async function* generate() {
      yield preambleBuf;
-      const fileStream = fs.createReadStream(filePath, { highWaterMark: 1024 * 1024 });
+      const fileStream = fs.createReadStream(filePath, { highWaterMark: 256 * 1024 });
      for await (const chunk of fileStream) {
        if (signal && signal.aborted) throw new Error('Aborted');
        if (throttle) await throttle.consume(chunk.length, signal);
--- a/lib/config-store.js
+++ b/lib/config-store.js
@ -184,87 +184,14 @@ class ConfigStore {
      ? app.getPath('userData')
      : path.join(__dirname, '..');
    this.filePath = path.join(dir, 'electron-config.json');
-    this.historyPath = path.join(dir, 'electron-history.json');
    this._writeQueue = Promise.resolve(); // Serializes all writes to prevent race conditions
-    this._historyWriteQueue = Promise.resolve();
-    this._historyMigrated = false;
    this._cache = null;
    this._cacheKey = '';
-    this._perfLog = null;
-    this._wqDepth = 0;

    // Migrate config from old location if current doesn't exist
    if (!fs.existsSync(this.filePath) && app && app.isPackaged) {
      this._migrateFromOldPath(app);
    }
-    if (app && app.isPackaged) {
-      this._migrateHistory();
-    }
-  }
-
-  _readHistoryFile() {
-    try {
-      const raw = fs.readFileSync(this.historyPath, 'utf-8');
-      if (!raw || raw.trim().length < 2) return [];
-      const parsed = JSON.parse(raw);
-      if (Array.isArray(parsed)) return parsed;
-      if (parsed && Array.isArray(parsed.history)) return parsed.history;
-      return [];
-    } catch {
-      return null;
-    }
-  }
-
-  _writeHistoryFileDurable(arr) {
-    const tmp = this.historyPath + '.tmp';
-    const fd = fs.openSync(tmp, 'w');
-    try {
-      fs.writeSync(fd, JSON.stringify(arr));
-      fs.fsyncSync(fd);
-    } finally {
-      fs.closeSync(fd);
-    }
-    fs.renameSync(tmp, this.historyPath);
-  }
-
-  _writeHistoryFileAtomic(arr) {
-    return new Promise((resolve, reject) => {
-      const tmp = this.historyPath + '.tmp';
-      fs.writeFile(tmp, JSON.stringify(arr), 'utf-8', (err) => {
-        if (err) return reject(err);
-        try { fs.renameSync(tmp, this.historyPath); } catch (e) { return reject(e); }
-        resolve();
-      });
-    });
-  }
-
-  _enqueueHistoryWrite(fn) {
-    this._historyWriteQueue = this._historyWriteQueue.then(fn, fn);
-    return this._historyWriteQueue;
-  }
-
-  _migrateHistory() {
-    try {
-      if (fs.existsSync(this.historyPath)) {
-        this._historyMigrated = Array.isArray(this._readHistoryFile());
-        return;
-      }
-      let cfg = null;
-      try { cfg = this._readAndParse(this.filePath); } catch {}
-      const hist = (cfg && Array.isArray(cfg.history)) ? cfg.history : [];
-      this._writeHistoryFileDurable(hist);
-      const check = this._readHistoryFile();
-      if (Array.isArray(check) && check.length === hist.length) {
-        if (hist.length > 0) {
-          try { fs.copyFileSync(this.filePath, this.filePath + '.pre-history-split.bak'); } catch {}
-        }
-        this._historyMigrated = true;
-      } else {
-        this._historyMigrated = false;
-      }
-    } catch {
-      this._historyMigrated = false;
-    }
  }

  _migrateFromOldPath(app) {
@ -301,40 +228,7 @@ class ConfigStore {
    catch { return JSON.parse(JSON.stringify(obj)); }
  }

-  setPerfLog(fn) { this._perfLog = typeof fn === 'function' ? fn : null; }
-
-  _pqLen(globalSettings) {
-    const pq = globalSettings && globalSettings.pendingQueue;
-    return pq && Array.isArray(pq.queueJobs) ? pq.queueJobs.length : 0;
-  }
-
-  _callerTag() {
-    const lines = (new Error().stack || '').split('\n');
-    const out = [];
-    for (let i = 2; i < lines.length && out.length < 3; i++) {
-      const line = lines[i].trim();
-      if (/config-store\.js/.test(line)) continue;
-      const m = line.match(/at (?:async )?([^ (]+)/);
-      if (m) out.push(m[1].split('.').pop());
-    }
-    return out.join('<') || '?';
-  }
-
  load() {
-    if (!this._perfLog) return this._loadImpl();
-    const hadCache = !!this._cache;
-    const t0 = performance.now();
-    const r = this._loadImpl();
-    const dt = performance.now() - t0;
-    if (dt >= 20) {
-      const q = this._pqLen(r && r.globalSettings);
-      const h = (r && r.history || []).length;
-      this._perfLog(`config-load wall=${dt.toFixed(0)}ms cache=${hadCache ? 'hit' : 'miss'} hist=${h} queue=${q} via=${this._callerTag()}`);
-    }
-    return r;
-  }
-
-  _loadImpl() {
    try {
      // In-memory cache keyed on the file's mtime+size. The processed config
      // (merged + credential-decrypted) is reparsed/re-decrypted from disk ONLY
@ -357,10 +251,8 @@ class ConfigStore {
      try { data = this._readAndParse(this.filePath); } catch {}
      // Fallback to backup if main is empty/corrupt
      if (!data) {
-        try { data = this._readAndParse(this.filePath + '.bak'); } catch {}
-      }
-      if (!data) {
-        try { data = this._readAndParse(this.filePath + '.pre-history-split.bak'); } catch {}
+        const backupPath = this.filePath + '.bak';
+        try { data = this._readAndParse(backupPath); } catch {}
      }
      if (!data) {
        const fresh = JSON.parse(JSON.stringify(DEFAULTS));
@ -436,7 +328,7 @@ class ConfigStore {
      const rotationCursors = (data.rotationCursors && typeof data.rotationCursors === 'object' && !Array.isArray(data.rotationCursors))
        ? data.rotationCursors
        : {};
-      const result = { hosters, hosterSettings, globalSettings, history: this._historyMigrated ? [] : (data.history || []), rotationCursors };
+      const result = { hosters, hosterSettings, globalSettings, history: data.history || [], rotationCursors };
      // Decrypt credentials stored with safeStorage so the rest of the app
      // keeps working with plaintext in memory.
      secretStore.decryptCredentials(result);
@ -464,68 +356,25 @@ class ConfigStore {
  }

  _commit(config) {
-    if (!this._perfLog) return this._atomicWrite(this._serializeForDisk(config));
-    const t0 = performance.now();
-    const data = this._serializeForDisk(config);
-    const dt = performance.now() - t0;
-    if (dt >= 20) {
-      const q = this._pqLen(config.globalSettings);
-      const h = (config.history || []).length;
-      this._perfLog(`config-serialize wall=${dt.toFixed(0)}ms bytes=${data.length} hist=${h} queue=${q} wqDepth=${this._wqDepth} via=${this._callerTag()}`);
-    }
-    return this._atomicWrite(data);
+    return this._atomicWrite(this._serializeForDisk(config));
  }

  _enqueueWrite(fn) {
-    this._wqDepth++;
-    const done = () => { this._wqDepth--; };
-    this._writeQueue = this._writeQueue.then(fn, fn).then(done, done);
+    this._writeQueue = this._writeQueue.then(fn, fn);
    return this._writeQueue;
  }

-  _anyHosters(cfg) {
-    const h = cfg && cfg.hosters;
-    return !!h && typeof h === 'object' && Object.values(h).some(a => Array.isArray(a) && a.length > 0);
-  }
-
-  _recoverHostersFromDisk() {
-    for (const p of [this.filePath, this.filePath + '.bak', this.filePath + '.pre-history-split.bak']) {
-      try {
-        const raw = fs.readFileSync(p, 'utf-8');
-        if (!raw || raw.trim().length < 2) continue;
-        const data = JSON.parse(raw);
-        if (this._anyHosters(data)) return data.hosters;
-      } catch {}
-    }
-    return null;
-  }
-
-  _guardHosters(current, hostersIntentional) {
-    if (!hostersIntentional && !this._anyHosters(current)) {
-      const recovered = this._recoverHostersFromDisk();
-      if (recovered) {
-        current.hosters = recovered;
-        if (this._perfLog) this._perfLog('config-guard: prevented account wipe — restored hosters from on-disk backup after a corrupt/empty read');
-      }
-    }
-    return current;
-  }
-
  save(config) {
    return this._enqueueWrite(() => {
      const current = this.load();
      if (config.hosters) current.hosters = config.hosters;
      if (config.hosterSettings) current.hosterSettings = config.hosterSettings;
      if (config.globalSettings) current.globalSettings = config.globalSettings;
-      this._guardHosters(current, !!config.hosters);
      return this._commit(current);
    });
  }

  loadHistory() {
-    if (this._historyMigrated) {
-      return this._readHistoryFile() || [];
-    }
    const config = this.load();
    return config.history || [];
  }
@ -534,22 +383,18 @@ class ConfigStore {
    return new Promise((resolve, reject) => {
      const tmpPath = this.filePath + '.tmp';
      const backupPath = this.filePath + '.bak';
-      let fd;
-      try {
-        fd = fs.openSync(tmpPath, 'w');
-        fs.writeSync(fd, data);
-        fs.fsyncSync(fd);
-      } catch (e) {
-        try { if (fd !== undefined) fs.closeSync(fd); } catch {}
-        return reject(e);
-      }
-      try { fs.closeSync(fd); } catch {}
-      Promise.resolve().then(() => {
+      fs.writeFile(tmpPath, data, 'utf-8', (err) => {
+        if (err) return reject(err);
        try {
+          // Refresh .bak from the previous live file with a raw byte copy —
+          // no read+JSON.parse+write. The live file was itself written through
+          // this atomic path, so re-validating it by parsing the whole (growing)
+          // config on every write was pure waste. Wrapped in try/catch so an
+          // AV/indexer briefly locking the file doesn't fail the save — the
+          // rename to the live path is the part that matters.
          try {
            if (fs.existsSync(this.filePath)) {
-              const cur = fs.readFileSync(this.filePath, 'utf-8');
-              if (cur && cur.trim().length > 2) fs.writeFileSync(backupPath, cur, 'utf-8');
+              fs.copyFileSync(this.filePath, backupPath);
            }
          } catch {}
          fs.renameSync(tmpPath, this.filePath);
@ -565,18 +410,6 @@ class ConfigStore {
  }

  appendHistory(entry) {
-    if (this._historyMigrated) {
-      return this._enqueueHistoryWrite(() => {
-        const cur = this._readHistoryFile();
-        if (cur === null && fs.existsSync(this.historyPath)) return;
-        const arr = cur || [];
-        arr.push(entry);
-        const gs = this.load().globalSettings;
-        const retention = (gs && gs.historyRetention) || 'all';
-        const pruned = applyHistoryRetention(arr, retention, Date.now());
-        return this._writeHistoryFileAtomic(pruned);
-      });
-    }
    return this._enqueueWrite(() => {
      const config = this.load();
      config.history.push(entry);
@ -588,24 +421,6 @@ class ConfigStore {

  pruneHistory(retention, opts = {}) {
    const dryRun = !!opts.dryRun;
-    if (this._historyMigrated) {
-      return this._enqueueHistoryWrite(() => {
-        const current = this._readHistoryFile() || [];
-        const beforeBatches = current.length;
-        const beforeRows = countHistoryRows(current);
-        const pruned = applyHistoryRetention(current, retention, Date.now());
-        const result = {
-          removedBatches: beforeBatches - pruned.length,
-          removedRows: beforeRows - countHistoryRows(pruned),
-          keptBatches: pruned.length,
-          keptRows: countHistoryRows(pruned)
-        };
-        if (dryRun) return result;
-        return this._writeHistoryFileAtomic(pruned)
-          .then(() => this.save({ globalSettings: { ...this.load().globalSettings, historyRetention: String(retention || 'all') } }))
-          .then(() => result);
-      });
-    }
    return this._enqueueWrite(() => {
      const config = this.load();
      const beforeBatches = config.history.length;
@ -625,9 +440,6 @@ class ConfigStore {
  }

  clearHistory() {
-    if (this._historyMigrated) {
-      return this._enqueueHistoryWrite(() => this._writeHistoryFileAtomic([]));
-    }
    return this._enqueueWrite(() => {
      const config = this.load();
      config.history = [];
@ -639,7 +451,6 @@ class ConfigStore {
    return this._enqueueWrite(() => {
      const config = this.load();
      config.rotationCursors = (cursors && typeof cursors === 'object' && !Array.isArray(cursors)) ? cursors : {};
-      this._guardHosters(config, false);
      return this._commit(config);
    });
  }
--- a/lib/diagnostics-collectors.js
+++ b/lib/diagnostics-collectors.js
@ -11,7 +11,7 @@ const READABLE_LOGS = {
 const QUEUE_STATUSES = ['preview', 'queued', 'getting-server', 'uploading', 'retrying', 'done', 'error', 'aborted', 'skipped'];

 function createCollectors(deps) {
-  const { loadConfig, loadHistory, getAllLogPaths, support, stats, appInfo, systemInfo, agentInfo } = deps;
+  const { loadConfig, getAllLogPaths, support, stats, appInfo, systemInfo, agentInfo } = deps;

  function _secrets() {
    try { return support.collectSecretValues(loadConfig()); } catch { return []; }
@ -205,9 +205,8 @@ function createCollectors(deps) {

  function getHistory(args) {
    const a = args || {};
-    const history = typeof loadHistory === 'function'
-      ? (loadHistory() || [])
-      : (Array.isArray(loadConfig().history) ? loadConfig().history : []);
+    const cfg = loadConfig();
+    const history = Array.isArray(cfg.history) ? cfg.history : [];
    const limit = Math.min(Math.max(Number(a.limit) || 20, 1), 200);
    const perHoster = stats.summarizePerHoster(history);
    const recent = [...history].slice(-limit).reverse();
--- a/lib/doodstream-upload.js
+++ b/lib/doodstream-upload.js
@ -339,7 +339,7 @@ class DoodstreamUploader {
    const epilogueBuf = Buffer.from(epilogue, 'utf-8');
    const totalSize = preambleBuf.length + fileSize + epilogueBuf.length;

-    const CHUNK_SIZE = 1024 * 1024;
+    const CHUNK_SIZE = 256 * 1024;
    let bytesRead = 0;

    async function* generate() {
--- a/lib/hosters.js
+++ b/lib/hosters.js
@ -288,7 +288,7 @@ function createUploadBody(filePath, formFields, onProgress, throttle, signal) {
  const { boundary, preambleBuf, epilogueBuf, totalSize, fileSize } = buildMultipart(filePath, formFields);

  let bytesRead = 0;
-  const CHUNK_SIZE = 1024 * 1024;
+  const CHUNK_SIZE = 256 * 1024;

  async function* generate() {
    yield preambleBuf;
--- a/lib/log-mode.js
+++ b/lib/log-mode.js
@ -1,7 +1,7 @@
 // Log-file mode resolution for fileuploader.log:
 //   - "single"  → one file:   fileuploader.log
 //   - "daily"   → per-day:    fileuploader-YYYY-MM-DD.log
-//   - "session" → per-launch: DD-MM-YYYY-mdu-session-HH-MM-NNNNNN.log
+//   - "session" → per-launch: fileuploader-session-YYYY-MM-DD_HH-MM-SS-<pid>.log
 //
 // Pure functions only — no fs, no Date.now() at call time — so they unit-test
 // cleanly and the main.js call sites pass in `new Date()` + the session stamp.
@ -38,11 +38,13 @@
    return `${date.getFullYear()}-${_two(date.getMonth() + 1)}-${_two(date.getDate())}`;
  }

-  function formatSessionStamp(date, rand) {
-    const d = `${_two(date.getDate())}-${_two(date.getMonth() + 1)}-${date.getFullYear()}`;
-    const t = `${_two(date.getHours())}-${_two(date.getMinutes())}`;
-    const r = (rand !== undefined && rand !== null && String(rand).trim()) ? `-${String(rand).trim()}` : '';
-    return `${d}-mdu-session-${t}${r}`;
+  function formatSessionStamp(date, pid) {
+    const d = `${date.getFullYear()}-${_two(date.getMonth() + 1)}-${_two(date.getDate())}`;
+    const t = `${_two(date.getHours())}-${_two(date.getMinutes())}-${_two(date.getSeconds())}`;
+    // PID disambiguates a same-second close→reopen — a human can't but two
+    // automated runs might. Cheap belt to a suspenders-not-required problem.
+    const pidStr = pid !== undefined && pid !== null ? `-${pid}` : '';
+    return `${d}_${t}${pidStr}`;
  }

  /**
@ -65,10 +67,9 @@
      const date = a.date instanceof Date ? a.date : new Date();
      return `${base}-${formatDateStamp(date)}${ext}`;
    }
-    // session — the stamp is the full app-defined stem (DD-MM-YYYY-mdu-session-HH-MM),
-    // independent of baseName.
+    // session
    const sid = a.sessionId && String(a.sessionId).trim();
-    if (sid) return `${sid}${ext}`;
+    if (sid) return `${base}-session-${sid}${ext}`;
    // Defensive: if a session-id wasn't passed, fall back to single rather
    // than emit a malformed name. main.js always supplies one.
    return `${base}${ext}`;
@ -84,9 +85,6 @@
   */
  function stripModeStampFromFileName(fileName) {
    if (!fileName || typeof fileName !== 'string') return fileName;
-    const newSessionRe = /^\d{2}-\d{2}-\d{4}-mdu-session-\d{2}-\d{2}(?:-\d+)?(\.[^.]+)?$/;
-    const mNew = fileName.match(newSessionRe);
-    if (mNew) return `fileuploader${mNew[1] || ''}`;
    // Order matters: session first (longer, more specific) before daily.
    // Both regexes are anchored to $ with no nested/ambiguous quantifiers, so
    // matching is linear — the eslint security warning is precautionary.
--- a/lib/startup-renderer.js
+++ b/lib/startup-renderer.js
@ -1,19 +0,0 @@
-function configureStartupRenderer(app) {
-  app.disableHardwareAcceleration();
-}
-
-function createStartupWindow(BrowserWindow, options) {
-  const window = new BrowserWindow({ ...options, show: false });
-  window.once('ready-to-show', () => {
-    window.show();
-  });
-
-  return {
-    window,
-    load(target, onLoadError) {
-      return window.loadFile(target).catch(onLoadError);
-    }
-  };
-}
-
-module.exports = { configureStartupRenderer, createStartupWindow };
--- a/lib/updater.js
+++ b/lib/updater.js
@ -37,14 +37,6 @@ function isNewer(remote, current) {
  return r.patch > c.patch;
 }

-function resolveReleaseVersion(release) {
-  for (const value of [release && release.name, release && release.tag_name]) {
-    const match = String(value || '').match(/(?:^|[^\d])v?(\d+\.\d+\.\d+)(?=$|[^\d.])/i);
-    if (match) return match[1];
-  }
-  return '';
-}
-
 function pickSetupAsset(assets) {
  if (!Array.isArray(assets)) return null;
  // Prefer asset with "setup" in the name (case-insensitive)
@ -98,12 +90,11 @@ async function checkForUpdate() {
  }

  const release = releases[0];
-  const remoteVersion = resolveReleaseVersion(release);
-  const transportTag = release.tag_name || '';
+  const remoteVersion = release.tag_name || release.name || '';
  const currentVersion = getCurrentVersion();

  if (!isNewer(remoteVersion, currentVersion)) {
-    cachedCheck = { available: false, currentVersion, remoteVersion, transportTag };
+    cachedCheck = { available: false, currentVersion, remoteVersion };
    cachedCheckTs = Date.now();
    return cachedCheck;
  }
@ -118,8 +109,7 @@ async function checkForUpdate() {
  cachedCheck = {
    available: true,
    currentVersion,
-    remoteVersion,
-    transportTag,
+    remoteVersion: remoteVersion.replace(/^v/i, ''),
    releaseUrl: release.html_url,
    assetUrl: setupAsset.browser_download_url,
    assetSize: setupAsset.size,
@ -189,27 +179,10 @@ async function installUpdate(onProgress) {
    let downloadedBytes = 0;
    const chunks = [];

-    const DOWNLOAD_STALL_MS = 45000;
-    let stallTimer = null;
    const reader = res.body.getReader();
    while (true) {
      if (signal.aborted) throw new Error('Abgebrochen');
-      let chunk;
-      try {
-        chunk = await Promise.race([
-          reader.read(),
-          new Promise((_, reject) => { stallTimer = setTimeout(() => reject(new Error('__STALL__')), DOWNLOAD_STALL_MS); })
-        ]);
-      } catch (e) {
-        if (e && e.message === '__STALL__') {
-          try { activeAbort.abort(); } catch {}
-          throw new Error('Download hängt — seit 45 s keine Daten (Netzwerk/Server überlastet). Bitte laufende Uploads stoppen und erneut versuchen.');
-        }
-        throw e;
-      } finally {
-        if (stallTimer) { clearTimeout(stallTimer); stallTimer = null; }
-      }
-      const { done, value } = chunk;
+      const { done, value } = await reader.read();
      if (done) break;
      chunks.push(value);
      downloadedBytes += value.length;
@ -290,4 +263,4 @@ function abortUpdate() {
  }
 }

-module.exports = { checkForUpdate, installUpdate, abortUpdate, isNewer, resolveReleaseVersion };
+module.exports = { checkForUpdate, installUpdate, abortUpdate };
--- a/lib/upload-manager.js
+++ b/lib/upload-manager.js
@ -34,11 +34,10 @@ class UploadManager extends EventEmitter {
    this.stopAfterActive = false;
    this.statsInterval = null;
    this.startTime = 0;
-    this.activeJobs = new Map(); // uploadId -> { jobId, speedKbs, bytesUploaded, hoster }
+    this.activeJobs = new Map(); // uploadId -> { jobId, speedKbs, bytesUploaded }
    this.jobAbortControllers = new Map(); // jobId -> AbortController
    this.cancelledJobIds = new Set();
    this.sessionBytes = 0;
-    this._transientErrorTotal = 0;
    this.lastStartTime = {}; // hoster -> timestamp of last upload start
    this.intervalLocks = {}; // hoster -> Promise chain for serialized interval waits
    this.globalThrottle = null;
@ -82,17 +81,6 @@ class UploadManager extends EventEmitter {
    return this.activeJobs.size;
  }

-  getDiagnostics() {
-    const activeByHoster = {};
-    for (const v of this.activeJobs.values()) {
-      const h = v && v.hoster ? v.hoster : 'unknown';
-      activeByHoster[h] = (activeByHoster[h] || 0) + 1;
-    }
-    let pending = 0;
-    for (const sem of Object.values(this.semaphores)) pending += (sem && sem.pending) || 0;
-    return { activeByHoster, transientErrors: this._transientErrorTotal, pending, active: this.activeJobs.size };
-  }
-
  clearFailedAccount(hoster, accountId) {
    return this._failedAccounts.delete(`${hoster}:${accountId}`);
  }
@ -364,17 +352,16 @@ class UploadManager extends EventEmitter {
    for (let i = 0; i < tasks.length; i += DEDUP_CHUNK) {
      if (signal.aborted) break;
      const end = Math.min(i + DEDUP_CHUNK, tasks.length);
-      const toStat = [];
      for (let j = i; j < end; j++) {
        const task = tasks[j];
        if (!results.has(task.file)) {
-          results.set(task.file, { name: path.basename(task.file), size: 0, results: [] });
-          toStat.push(task.file);
+          const fileName = path.basename(task.file);
+          let size = 0;
+          try { size = fs.statSync(task.file).size; } catch {}
+          results.set(task.file, { name: fileName, size, results: [] });
        }
      }
-      await Promise.all(toStat.map(async (f) => {
-        try { const st = await fs.promises.stat(f); const e = results.get(f); if (e) e.size = st.size; } catch {}
-      }));
+      if (end < tasks.length) await new Promise(setImmediate);
    }

    this._startStatsTimer();
@ -426,7 +413,7 @@ class UploadManager extends EventEmitter {
    if (cachedResult && typeof cachedResult.size === 'number' && cachedResult.size > 0) {
      fileSize = cachedResult.size;
    } else {
-      try { fileSize = (await fs.promises.stat(task.file)).size; } catch { fileNotFound = true; }
+      try { fileSize = fs.statSync(task.file).size; } catch { fileNotFound = true; }
    }

    const maxAttempts = Math.max(1, (settings.retries || 0) + 1);
@ -638,7 +625,7 @@ class UploadManager extends EventEmitter {
          // Mutate this single object on each progress callback instead of
          // allocating a fresh one — callback fires on every stream chunk
          // (hundreds/sec per active job).
-          const activeEntry = { jobId, speedKbs: 0, bytesUploaded: 0, hoster: task.hoster };
+          const activeEntry = { jobId, speedKbs: 0, bytesUploaded: 0 };
          this.activeJobs.set(uploadId, activeEntry);

          let lastEmitTime = 0;
@ -699,7 +686,6 @@ class UploadManager extends EventEmitter {
          return;
        } catch (err) {
          this.activeJobs.delete(uploadId);
-          if (this._isTransientNetworkError(err)) this._transientErrorTotal++;

          const isSpeedRestart = speedAbort && speedAbort.signal.aborted && !signal.aborted;
          if (!signal.aborted && !isSpeedRestart) {
@ -952,7 +938,7 @@ class UploadManager extends EventEmitter {
            let lastBytes = 0;
            let lastSpeedTime = jobStart;
            let currentSpeedKbs = 0;
-            const activeEntry = { jobId, speedKbs: 0, bytesUploaded: 0, hoster: task.hoster };
+            const activeEntry = { jobId, speedKbs: 0, bytesUploaded: 0 };
            this.activeJobs.set(uploadId, activeEntry);

            let lastEmitTime = 0;
@ -1088,7 +1074,7 @@ class UploadManager extends EventEmitter {
      let lastBytes = 0;
      let lastSpeedTime = jobStart;
      let currentSpeedKbs = 0;
-      const activeEntry = { jobId, speedKbs: 0, bytesUploaded: 0, hoster: task.hoster };
+      const activeEntry = { jobId, speedKbs: 0, bytesUploaded: 0 };
      this.activeJobs.set(uploadId, activeEntry);
      let lastEmitTime = 0;
      const PROGRESS_EMIT_INTERVAL = 250;
--- a/lib/vidmoly-upload.js
+++ b/lib/vidmoly-upload.js
@ -187,7 +187,7 @@ class VidmolyUploader {
    const totalSize = preambleBuf.length + fileSize + epilogueBuf.length;

    let bytesRead = 0;
-    const CHUNK_SIZE = 1024 * 1024;
+    const CHUNK_SIZE = 256 * 1024;

    async function* generate() {
      yield preambleBuf;
--- a/lib/voe-upload.js
+++ b/lib/voe-upload.js
@ -242,7 +242,7 @@ class VoeUploader {
    const totalSize = preambleBuf.length + fileSize + epilogueBuf.length;

    let bytesRead = 0;
-    const CHUNK_SIZE = 1024 * 1024;
+    const CHUNK_SIZE = 256 * 1024;

    async function* generate() {
      yield preambleBuf;
--- a/main.js
+++ b/main.js
@ -1,8 +1,6 @@
-process.env.UV_THREADPOOL_SIZE = process.env.UV_THREADPOOL_SIZE || '8';
-const { monitorEventLoopDelay, PerformanceObserver } = require('perf_hooks');
-const { app, BrowserWindow, ipcMain, dialog, clipboard, nativeTheme, Tray, Menu, nativeImage } = require('electron');
-const { configureStartupRenderer, createStartupWindow } = require('./lib/startup-renderer');
-configureStartupRenderer(app);
+process.env.UV_THREADPOOL_SIZE = process.env.UV_THREADPOOL_SIZE || '64';
+const { monitorEventLoopDelay } = require('perf_hooks');
+const { app, BrowserWindow, ipcMain, dialog, clipboard, nativeTheme, Tray, Menu } = require('electron');
 nativeTheme.themeSource = 'dark';
 const path = require('path');
 const fs = require('fs');
@ -32,69 +30,12 @@ const { createAgent } = require('./lib/diagnostics-agent');
 const _eventLoopDelay = monitorEventLoopDelay({ resolution: 10 });
 _eventLoopDelay.enable();
 let _eldLastLog = 0;
-let _lastCpu = process.cpuUsage();
-let _lastCpuT = Date.now();
-let _gcCount = 0;
-let _gcTotalMs = 0;
-let _gcMaxMs = 0;
-try {
-  const _gcObserver = new PerformanceObserver((list) => {
-    for (const entry of list.getEntries()) {
-      _gcCount++;
-      _gcTotalMs += entry.duration;
-      if (entry.duration > _gcMaxMs) _gcMaxMs = entry.duration;
-    }
-  });
-  _gcObserver.observe({ entryTypes: ['gc'] });
-} catch {}
-
-const _perfOn = process.env.MHU_PERF !== '0';
-let _lastIpcChannel = '';
-if (_perfOn) {
-  let _driftTick = Date.now();
-  setInterval(() => {
-    const now = Date.now();
-    const drift = now - _driftTick - 100;
-    _driftTick = now;
-    if (drift >= 100) {
-      try { logInfo(`main-longtask blocked=${drift}ms lastIpc=${_lastIpcChannel || '-'} gc=${_gcCount} gcMax=${_gcMaxMs.toFixed(0)}ms`); } catch {}
-    }
-  }, 100).unref();
-
-  const IPC_SLOW_MS = 50;
-  const _ipcLog = (m) => { try { logInfo(m); } catch {} };
-  const _rawHandle = ipcMain.handle.bind(ipcMain);
-  ipcMain.handle = (channel, fn) => _rawHandle(channel, function (evt, ...args) {
-    _lastIpcChannel = channel;
-    const t0 = performance.now();
-    let p;
-    try { p = fn.call(this, evt, ...args); }
-    catch (e) { _ipcLog(`ipc ${channel} sync-throw wall=${(performance.now() - t0).toFixed(0)}ms`); throw e; }
-    const sync = performance.now() - t0;
-    if (p && typeof p.then === 'function') {
-      return Promise.resolve(p).finally(() => {
-        const total = performance.now() - t0;
-        if (total >= IPC_SLOW_MS) _ipcLog(`ipc ${channel} wall=${total.toFixed(0)}ms sync=${sync.toFixed(0)}ms`);
-      });
-    }
-    if (sync >= IPC_SLOW_MS) _ipcLog(`ipc ${channel} wall=${sync.toFixed(0)}ms sync`);
-    return p;
-  });
-  const _rawOn = ipcMain.on.bind(ipcMain);
-  ipcMain.on = (channel, fn) => _rawOn(channel, function (evt, ...args) {
-    _lastIpcChannel = channel;
-    const t0 = performance.now();
-    try { return fn.call(this, evt, ...args); }
-    finally { const dt = performance.now() - t0; if (dt >= IPC_SLOW_MS) _ipcLog(`ipc ${channel} wall=${dt.toFixed(0)}ms sync-on`); }
-  });
-}

 let mainWindow;
 let _lastImportPath = null;
 let dropTargetWindow = null;
 let tray = null;
 const configStore = new ConfigStore(app);
-configStore.setPerfLog((m) => { try { logInfo(m); } catch {} });
 let uploadManager = null;
 let diagnosticAgent = null;
 let _diagHandler = null;
@ -256,42 +197,7 @@ function _maybeLogEventLoopDelay(activeJobs) {
    const max = (_eventLoopDelay.max / ns).toFixed(1);
    const p99 = (_eventLoopDelay.percentile(99) / ns).toFixed(1);
    const stddev = (_eventLoopDelay.stddev / ns).toFixed(1);
-    let resStr = '';
-    try {
-      const info = process.getActiveResourcesInfo();
-      const hist = {};
-      for (const t of info) hist[t] = (hist[t] || 0) + 1;
-      const top = Object.entries(hist).sort((a, b) => b[1] - a[1]).slice(0, 6).map(([k, v]) => `${k}:${v}`).join(',');
-      resStr = ` resources=${info.length} {${top}}`;
-    } catch {}
-    let cpuStr = '';
-    try {
-      const d = process.cpuUsage(_lastCpu);
-      const wall = now - _lastCpuT;
-      const pct = wall > 0 ? Math.round((d.user + d.system) / 1000 / wall * 100) : 0;
-      const mem = process.memoryUsage();
-      const rss = Math.round(mem.rss / 1048576);
-      const heap = Math.round(mem.heapUsed / 1048576);
-      const ext = Math.round(mem.external / 1048576);
-      const ab = Math.round((mem.arrayBuffers || 0) / 1048576);
-      cpuStr = ` cpu=${pct}%core rss=${rss}MB heap=${heap}MB ext=${ext}MB ab=${ab}MB`;
-      _lastCpu = process.cpuUsage();
-      _lastCpuT = now;
-    } catch {}
-    let gcStr = '';
-    try {
-      gcStr = ` gc=${_gcCount} gcTotal=${_gcTotalMs.toFixed(0)}ms gcMax=${_gcMaxMs.toFixed(0)}ms`;
-      _gcCount = 0; _gcTotalMs = 0; _gcMaxMs = 0;
-    } catch {}
-    let upStr = '';
-    try {
-      if (uploadManager && typeof uploadManager.getDiagnostics === 'function') {
-        const d = uploadManager.getDiagnostics();
-        const byHoster = Object.entries(d.activeByHoster || {}).map(([h, c]) => `${h.replace(/\..*$/, '')}:${c}`).join(',');
-        upStr = ` active-by-hoster={${byHoster}} transient-errs=${d.transientErrors || 0} pending=${d.pending || 0}`;
-      }
-    } catch {}
-    logInfo(`eventloop-delay active=${activeJobs} mean=${mean}ms p99=${p99}ms max=${max}ms stddev=${stddev}ms threadpool=${process.env.UV_THREADPOOL_SIZE}${cpuStr}${gcStr}${resStr}${upStr}`);
+    logInfo('perf', `eventloop-delay active=${activeJobs} mean=${mean}ms p99=${p99}ms max=${max}ms stddev=${stddev}ms threadpool=${process.env.UV_THREADPOOL_SIZE}`);
    _eventLoopDelay.reset();
  } catch {}
 }
@ -555,10 +461,10 @@ function getBaseLogFilePath() {
 // Log-mode bookkeeping. Three modes (see lib/log-mode.js): single, daily, session.
 // The session-id is stamped ONCE at main-process startup so every write of a
 // given session lands in the same file. A close→reopen of the app starts a new
-// main process, so a new SESSION_ID, so a new session file. A 6-digit random is
-// appended as a cheap hedge against same-minute restart collisions.
+// main process, so a new SESSION_ID, so a new session file. PID is appended as
+// a cheap hedge against same-second restart collisions.
 const { resolveLogFileName, formatSessionStamp, formatDateStamp, stripModeStampFromFileName } = require('./lib/log-mode');
-const SESSION_ID = formatSessionStamp(new Date(), String(Math.floor(100000 + Math.random() * 900000)));
+const SESSION_ID = formatSessionStamp(new Date(), process.pid);
 let _activeLogKey = null;   // remembers (mode + date-or-session) so cache rolls correctly
 let _activeLogPath = null;

@ -1222,7 +1128,7 @@ async function runHosterHealthCheck(config, requestedChecks) {
 }

 function createWindow() {
-  const startupWindow = createStartupWindow(BrowserWindow, {
+  mainWindow = new BrowserWindow({
    width: 1100,
    height: 750,
    minWidth: 800,
@ -1235,7 +1141,6 @@ function createWindow() {
      preload: path.join(__dirname, 'preload.js')
    }
  });
-  mainWindow = startupWindow.window;

  mainWindow.webContents.setBackgroundThrottling(false);

@ -1283,27 +1188,12 @@ function createWindow() {
    debugLog(`CHILD PROCESS GONE: type=${details.type} reason=${details.reason} exitCode=${details.exitCode}`);
  });

-  startupWindow.load(path.join(__dirname, 'renderer', 'index.html'), (err) => {
-    _writeCrashLog('LOAD FILE FAILED', err);
-    debugLog(`LOAD FILE FAILED: ${err && err.stack ? err.stack : err}`);
-  });
+  mainWindow.loadFile(path.join(__dirname, 'renderer', 'index.html'));
 }

 function createTray() {
-  try {
-    const candidates = [
-      path.join(process.resourcesPath || __dirname, 'assets', 'app_icon.ico'),
-      path.join(__dirname, 'assets', 'app_icon.ico'),
-      path.join(__dirname, 'assets', 'icon.png')
-    ];
-    let icon = null;
-    for (const p of candidates) {
-      try {
-        const img = nativeImage.createFromPath(p);
-        if (img && !img.isEmpty()) { icon = img; break; }
-      } catch {}
-    }
-    tray = new Tray(icon || nativeImage.createEmpty());
+  const iconPath = path.join(__dirname, 'assets', 'app_icon.ico');
+  tray = new Tray(iconPath);
  tray.setToolTip('Multi-Hoster-Upload');

  const contextMenu = Menu.buildFromTemplate([
@ -1316,10 +1206,6 @@ function createTray() {
  tray.on('click', () => {
    if (mainWindow) { mainWindow.show(); mainWindow.focus(); }
  });
-  } catch (err) {
-    tray = null;
-    debugLog(`createTray failed (non-fatal): ${err && err.message ? err.message : err}`);
-  }
 }

 function updateTrayTooltip(text) {
@ -2209,11 +2095,9 @@ ipcMain.handle('clear-history', async () => {

 // --- Backup export / import ---
 ipcMain.handle('export-backup', async () => {
-  const _bd = new Date();
-  const _bdate = `${String(_bd.getDate()).padStart(2, '0')}-${String(_bd.getMonth() + 1).padStart(2, '0')}-${_bd.getFullYear()}`;
  const { canceled, filePath } = await dialog.showSaveDialog(mainWindow, {
    title: 'Backup exportieren',
-    defaultPath: `${_bdate}-multihoster-backup.mhu`,
+    defaultPath: `multi-hoster-backup-${new Date().toISOString().slice(0, 10)}.mhu`,
    filters: [
      { name: 'Multi-Hoster Backup (verschlüsselt)', extensions: ['mhu'] },
      { name: 'Multi-Hoster Backup (Klartext JSON)', extensions: ['json'] }
@ -2382,7 +2266,6 @@ ipcMain.handle('app:check-updates', async () => {
 });

 ipcMain.handle('app:install-update', () => {
-  try { if (uploadManager) uploadManager.cancel(); } catch {}
  installUpdate((progress) => {
    safeSend('app:update-progress', progress);
  }).catch((err) => {
@ -2484,12 +2367,10 @@ ipcMain.on('save-global-settings-sync', (event, globalSettings) => {
    const _diskDiag = current.globalSettings && current.globalSettings.diagnostics;
    current.globalSettings = globalSettings;
    if (_diskDiag) current.globalSettings.diagnostics = _diskDiag;
-    try { configStore._guardHosters(current, false); } catch {}
    _invalidateLogSettings();
    const data = configStore._serializeForDisk(current);
    const backupPath = configStore.filePath + '.bak';
-    const _fd = fs.openSync(tmpPath, 'w');
-    try { fs.writeSync(_fd, data); fs.fsyncSync(_fd); } finally { fs.closeSync(_fd); }
+    fs.writeFileSync(tmpPath, data, 'utf-8');
    if (fs.existsSync(configStore.filePath)) {
      // Use try/catch around the read so an AV/lock race doesn't fail the
      // whole save just because we couldn't refresh the .bak — the write to
@ -2627,7 +2508,6 @@ function _diagAgentInfo() {
 function _buildDiagnosticHandler() {
  const collectors = createCollectors({
    loadConfig: () => configStore.load(),
-    loadHistory: () => configStore.loadHistory(),
    getAllLogPaths,
    support: { sanitizeConfig, collectSecretValues, redactLogText, valueScrub, collectFile, REDACTED },
    stats,
--- a/package-lock.json
+++ b/package-lock.json
@ -1,16 +1,16 @@
 {
  "name": "multi-hoster-uploader",
-  "version": "2.0.2",
+  "version": "3.3.16",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "multi-hoster-uploader",
-      "version": "2.0.2",
+      "version": "3.3.16",
      "dependencies": {
        "chokidar": "^3.6.0",
-        "undici": "^7.29.0",
-        "ws": "^8.21.0"
+        "undici": "^7.16.0",
+        "ws": "^8.19.0"
      },
      "devDependencies": {
        "electron": "^41.3.0",
@ -4734,9 +4734,9 @@
      }
    },
    "node_modules/undici": {
-      "version": "7.29.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-7.29.0.tgz",
-      "integrity": "sha512-IDxfleLmmbSskfWSUATiN1nfn2rDuvnMOqb5CWR92iIfojA0Ud+ulOAAEQ57LPr9rWmsreUyf5lwyao+7GNNVw==",
+      "version": "7.25.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-7.25.0.tgz",
+      "integrity": "sha512-xXnp4kTyor2Zq+J1FfPI6Eq3ew5h6Vl0F/8d9XU5zZQf1tX9s2Su1/3PiMmUANFULpmksxkClamIZcaUqryHsQ==",
      "license": "MIT",
      "engines": {
        "node": ">=20.18.1"
@ -4844,9 +4844,9 @@
      "license": "ISC"
    },
    "node_modules/ws": {
-      "version": "8.21.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.0.tgz",
-      "integrity": "sha512-Vsp28b7DRcimFQvrqu2Wek3z1iYxDCWqHYB8Qsnk/S4RfaCQzPGPyBNuVjJV3cd6UiKtUtp6sNM77gWvzcCH+g==",
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
+      "integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
      "license": "MIT",
      "engines": {
        "node": ">=10.0.0"
--- a/package.json
+++ b/package.json
@ -1,6 +1,6 @@
 {
  "name": "multi-hoster-uploader",
-  "version": "2.0.2",
+  "version": "3.3.91",
  "description": "Upload files to doodstream, voe, vidmoly, byse simultaneously",
  "main": "main.js",
  "scripts": {
@ -12,8 +12,8 @@
  },
  "dependencies": {
    "chokidar": "^3.6.0",
-    "undici": "^7.29.0",
-    "ws": "^8.21.0"
+    "undici": "^7.16.0",
+    "ws": "^8.19.0"
  },
  "devDependencies": {
    "electron": "^41.3.0",
@ -33,9 +33,7 @@
      "main.js",
      "preload.js",
      "lib/**/*",
-      "renderer/**/*",
-      "assets/app_icon.ico",
-      "assets/app_icon.png"
+      "renderer/**/*"
    ],
    "win": {
      "target": [
--- a/renderer/account-submit.js
+++ b/renderer/account-submit.js
@ -1,73 +0,0 @@
-(function (scope) {
-  function getAccountSubmitLabel({ isEdit } = {}) {
-    return isEdit ? 'Prüfen und speichern' : 'Prüfen und anlegen';
-  }
-
-  async function submitValidatedAccount({ validate, commit, afterCommit, isCurrent }) {
-    let validation;
-    try {
-      validation = await validate();
-    } catch (error) {
-      return { status: 'error', error };
-    }
-
-    try {
-      if (!isCurrent()) return { status: 'stale', validation };
-    } catch (error) {
-      return { status: 'error', error, validation };
-    }
-    if (validation && validation.status === 'otp_required') {
-      return { status: 'otp_required', validation };
-    }
-    if (!validation || (validation.status !== 'ok' && validation.status !== 'warn')) {
-      return { status: 'rejected', validation };
-    }
-
-    let value;
-    try {
-      value = await commit(validation);
-    } catch (error) {
-      return { status: 'error', error, validation };
-    }
-
-    let postCommitError;
-    if (typeof afterCommit === 'function') {
-      try {
-        await afterCommit(value, validation);
-      } catch (error) {
-        postCommitError = error;
-      }
-    }
-
-    const committedResult = { status: 'committed', committed: true, validation, value };
-    if (postCommitError) committedResult.postCommitError = postCommitError;
-    try {
-      if (!isCurrent()) return { ...committedResult, status: 'stale' };
-    } catch {
-      return { ...committedResult, status: 'stale' };
-    }
-    return committedResult;
-  }
-
-  function createAccountSubmitter() {
-    let pending = null;
-    return {
-      isBusy() {
-        return pending !== null;
-      },
-      submit(options) {
-        if (pending) return null;
-        const operation = submitValidatedAccount(options);
-        const tracked = operation.finally(() => {
-          if (pending === tracked) pending = null;
-        });
-        pending = tracked;
-        return tracked;
-      }
-    };
-  }
-
-  const accountSubmit = { createAccountSubmitter, getAccountSubmitLabel, submitValidatedAccount };
-  if (typeof module !== 'undefined' && module.exports) module.exports = accountSubmit;
-  if (scope) scope.AccountSubmit = accountSubmit;
-})(typeof window !== 'undefined' ? window : globalThis);
--- a/renderer/app.js
+++ b/renderer/app.js
@ -18,62 +18,6 @@ let config = { hosters: {}, hosterSettings: {}, globalSettings: {} };
 let hosterSettings = {};
 let uploading = false;
 let healthCheckRunning = false;
-
-let _rLongTasks = 0, _rLongTaskMax = 0, _rFrameLast = 0, _rFrameWorst = 0, _rFrameCount = 0, _rFrameJank = 0, _rPerfLastLog = 0, _rPerfWindowStart = 0;
-function _rElLabel(el) {
-  try {
-    if (!el || !el.tagName) return '?';
-    let s = el.tagName.toLowerCase();
-    if (el.id) s += '#' + el.id;
-    else if (el.className && typeof el.className === 'string') { const c = el.className.trim().split(/\s+/)[0]; if (c) s += '.' + c; }
-    const a = el.getAttribute && (el.getAttribute('data-action') || el.getAttribute('data-tab') || el.getAttribute('aria-label') || el.getAttribute('title'));
-    if (a) s += `[${String(a).slice(0, 24)}]`;
-    return s;
-  } catch { return '?'; }
-}
-try {
-  if (window.PerformanceObserver) {
-    new window.PerformanceObserver((list) => {
-      for (const e of list.getEntries()) {
-        _rLongTasks++;
-        if (e.duration > _rLongTaskMax) _rLongTaskMax = e.duration;
-        if (e.duration >= 100 && window.api && window.api.debugLog) window.api.debugLog(`renderer-longtask dur=${Math.round(e.duration)}ms`);
-      }
-    }).observe({ entryTypes: ['longtask'] });
-  }
-} catch {}
-try {
-  if (window.PerformanceObserver) {
-    new window.PerformanceObserver((list) => {
-      for (const e of list.getEntries()) {
-        const proc = Math.round((e.processingEnd || 0) - (e.processingStart || 0));
-        if (window.api && window.api.debugLog) window.api.debugLog(`renderer-interaction ${e.name} dur=${Math.round(e.duration)}ms proc=${proc}ms target=${_rElLabel(e.target)}`);
-      }
-    }).observe({ type: 'event', durationThreshold: 50, buffered: true });
-  }
-} catch {}
-function _rFrameTick(ts) {
-  if (_rFrameLast) { const d = ts - _rFrameLast; _rFrameCount++; if (d > _rFrameWorst) _rFrameWorst = d; if (d > 33) _rFrameJank++; }
-  _rFrameLast = ts;
-  requestAnimationFrame(_rFrameTick);
-}
-requestAnimationFrame(_rFrameTick);
-function _resetRendererPerf() {
-  _rPerfWindowStart = Date.now();
-  _rFrameCount = 0; _rFrameJank = 0; _rFrameWorst = 0; _rLongTasks = 0; _rLongTaskMax = 0;
-}
-function _maybeLogRendererPerf(activeJobs) {
-  const now = Date.now();
-  if (!_rPerfWindowStart) _rPerfWindowStart = now;
-  if (now - _rPerfLastLog < 5000) return;
-  const winSec = (now - _rPerfWindowStart) / 1000;
-  const fps = winSec > 0 ? Math.round(_rFrameCount / winSec) : 0;
-  if (window.api && window.api.debugLog) {
-    window.api.debugLog(`renderer-perf active=${activeJobs} fps=${fps} jankFrames=${_rFrameJank} worstFrame=${Math.round(_rFrameWorst)}ms longtasks=${_rLongTasks} maxTask=${Math.round(_rLongTaskMax)}ms`);
-  }
-  _rPerfLastLog = now;
-  _resetRendererPerf();
-}
 let accountStatuses = {}; // { accountId: { status: 'ok'|'warn'|'error'|'checking'|'unchecked', message: '' } }
 let editingAccountId = null; // null = adding, string = editing account by ID
 let autoHealthCheckEnabled = true;
@ -332,7 +276,6 @@ async function init() {

 // --- Tab switching ---
 let _historyDirty = false;
-let _historyEverLoaded = false;
 function _isHistoryTabActive() {
  const tab = document.querySelector('.tab.active');
  return !!(tab && tab.dataset.view === 'history');
@ -353,18 +296,15 @@ function _isHistoryTabActive() {
    if (!tab || tab === activeTab) return;
    if (activeTab) {
      activeTab.classList.remove('active');
-      activeTab.setAttribute('aria-selected', 'false');
-      activeTab.tabIndex = -1;
      const prevView = viewsById[`${activeTab.dataset.view}-view`];
      if (prevView) prevView.classList.remove('active');
    }
    tab.classList.add('active');
-    tab.setAttribute('aria-selected', 'true');
-    tab.tabIndex = 0;
    const nextView = viewsById[`${tab.dataset.view}-view`];
    if (nextView) nextView.classList.add('active');
    activeTab = tab;
-    if (tab.dataset.view === 'history' && (_historyDirty || !_historyEverLoaded)) {
+    if (tab.dataset.view === 'history') {
+      _historyDirty = false;
      loadHistory();
    }
  };
@ -372,18 +312,6 @@ function _isHistoryTabActive() {
  const tabBar = tabs[0] && tabs[0].parentElement;
  if (tabBar) {
    tabBar.addEventListener('click', (e) => handle(e.target));
-    tabBar.addEventListener('keydown', (e) => {
-      if (!['ArrowLeft', 'ArrowRight', 'Home', 'End'].includes(e.key)) return;
-      e.preventDefault();
-      const current = Math.max(0, tabs.indexOf(activeTab));
-      const next = e.key === 'Home'
-        ? 0
-        : e.key === 'End'
-          ? tabs.length - 1
-          : (current + (e.key === 'ArrowRight' ? 1 : -1) + tabs.length) % tabs.length;
-      tabs[next].focus();
-      handle(tabs[next]);
-    });
  } else {
    // Fallback: bind per-tab if somehow no common parent
    tabs.forEach(t => t.addEventListener('click', () => handle(t)));
@ -1936,20 +1864,9 @@ document.addEventListener('click', (e) => {
  if (!e.target.closest('.context-menu')) hideContextMenu();
 });
 document.addEventListener('keydown', (e) => {
-  const accountModal = document.getElementById('accountModal');
-  if (e.key === 'Tab' && accountModal && accountModal.style.display !== 'none') {
-    const focusable = Array.from(accountModal.querySelectorAll('button:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"])'));
-    const first = focusable[0];
-    const last = focusable[focusable.length - 1];
-    if (first && last && ((!e.shiftKey && document.activeElement === last) || (e.shiftKey && document.activeElement === first))) {
-      e.preventDefault();
-      (e.shiftKey ? last : first).focus();
-    }
-  }
  if (e.key === 'Escape') {
    hideContextMenu();
    cancelHosterModal();
-    if (accountModal && accountModal.style.display !== 'none') closeAccountModal();
  }
  if (e.target.closest('input, textarea, select')) return;
  const activeView = document.querySelector('.view.active');
@ -2622,12 +2539,6 @@ function _handleStatsImpl(data) {
  updateStatusBar();
  updateStatsPanel();

-  if (data.state === 'uploading' && (data.activeJobs || 0) > 0) {
-    _maybeLogRendererPerf(data.activeJobs);
-  } else {
-    _resetRendererPerf();
-  }
-
  // Track run time
  if (data.state === 'uploading' || data.state === 'stopping') {
    if (!statsStartTime) {
@ -2839,13 +2750,13 @@ const SESSION_FILES_CAP = 2000;
 function maybeAddSessionFile(job) {
  if (!job) return;

+  const dt = formatDateTime(new Date());
  if (job.status === 'done' && job.result) {
    const link = job.result.download_url || job.result.embed_url || '';
    if (!link) return;
    const dedupKey = `${link}\u0001${job.fileName}\u0001${job.hoster}`;
    if (!_sessionFileKeys.has(dedupKey)) {
      _sessionFileKeys.add(dedupKey);
-      const dt = formatDateTime(new Date());
      sessionFilesData.push({
        date: dt.text,
        dateTs: dt.ts,
@ -2978,12 +2889,12 @@ function updateStatusBar() {
  const totalSize = Math.max(stats.totalSize, _sessionTotalBytes);
  document.getElementById('sbTotal').textContent = `${formatSize(uploadedSize)} / ${formatSize(totalSize)}`;
  document.getElementById('sbEta').textContent = `ETA ${etaSeconds > 0 ? formatTime(etaSeconds) : '--:--'}`;
-  document.getElementById('sbConnections').textContent = `Verbindungen ${lastUploadStats.activeJobs || 0}`;
-  document.getElementById('sbQueueCount').textContent = `Gesamt ${stats.total}`;
-  document.getElementById('sbRemainingCount').textContent = `Verbleibend ${stats.remaining}`;
-  document.getElementById('sbInProgressCount').textContent = `Läuft ${stats.inProgress}`;
-  document.getElementById('sbDoneCount').textContent = `Fertig ${_sessionDoneCount}`;
-  document.getElementById('sbErrorCount').textContent = `Fehler ${_sessionErrorCount}`;
+  document.getElementById('sbConnections').textContent = `Connections: ${lastUploadStats.activeJobs || 0}`;
+  document.getElementById('sbQueueCount').textContent = `Total: ${stats.total}`;
+  document.getElementById('sbRemainingCount').textContent = `Remaining: ${stats.remaining}`;
+  document.getElementById('sbInProgressCount').textContent = `In Progress: ${stats.inProgress}`;
+  document.getElementById('sbDoneCount').textContent = `Done: ${_sessionDoneCount}`;
+  document.getElementById('sbErrorCount').textContent = `Error: ${_sessionErrorCount}`;
 }

 // --- Health Check ---
@ -3891,10 +3802,8 @@ function renderAccounts() {
  if (allAccounts.length === 0) {
    container.innerHTML = `
      <div class="accounts-empty">
-        <div class="accounts-empty-icon" aria-hidden="true">+</div>
-        <h3>Noch keine Accounts</h3>
-        <p>Füge deinen ersten Hoster-Account hinzu. Die Zugangsdaten werden vor dem Speichern geprüft.</p>
-        <button class="btn btn-primary" type="button" data-account-empty-add>Ersten Account hinzufügen</button>
+        <p>Keine Accounts vorhanden</p>
+        <span class="hint">Klicke auf "Account hinzufügen", um einen Hoster einzurichten.</span>
      </div>`;
    if (footer) footer.style.display = 'none';
    if (!_accountListenersBound) bindAccountListeners(container);
@ -4135,7 +4044,6 @@ function bindAccountListeners(container) {
    }
    const btn = e.target.closest('button');
    if (!btn) return;
-    if (btn.hasAttribute('data-account-empty-add')) return openAccountModal(null);
    if (btn.dataset.accountToggle) return toggleAccount(btn.dataset.accountToggle);
    if (btn.dataset.accountEdit) return openAccountModal(btn.dataset.accountEdit);
    if (btn.dataset.accountDelete) return openDeleteAccountModal(btn.dataset.accountDelete);
@ -4270,43 +4178,28 @@ function getCredsFieldsHtml(authType, account, hoster) {
    };
    return `
      <div class="settings-row">
-        <label for="accField_username">${escapeHtml(fld.label)}</label>
-        <input type="${fld.inputType}" class="key-input" id="accField_username" name="username" autocomplete="username" spellcheck="false" value="${escapeAttr(account.username || '')}" placeholder="${escapeAttr(fld.placeholder)}">
+        <label>${escapeHtml(fld.label)}</label>
+        <input type="${fld.inputType}" class="key-input" id="accField_username" value="${escapeAttr(account.username || '')}" placeholder="${escapeAttr(fld.placeholder)}">
      </div>
      <div class="settings-row">
-        <label for="accField_password">Passwort</label>
-        <input type="password" class="key-input" id="accField_password" name="password" autocomplete="current-password" value="${escapeAttr(account.password || '')}" placeholder="Passwort">
-        <button class="toggle-vis" type="button" title="Passwort anzeigen" aria-label="Passwort anzeigen" aria-pressed="false">&#128065;</button>
+        <label>Passwort</label>
+        <input type="password" class="key-input" id="accField_password" value="${escapeAttr(account.password || '')}" placeholder="Passwort">
+        <button class="toggle-vis" type="button" title="Anzeigen">&#128065;</button>
      </div>`;
  }
  // API key
  return `
    <div class="settings-row">
-      <label for="accField_apiKey">API-Key</label>
-      <input type="password" class="key-input" id="accField_apiKey" name="apiKey" autocomplete="off" spellcheck="false" value="${escapeAttr(account.apiKey || '')}" placeholder="API-Key">
-      <button class="toggle-vis" type="button" title="API-Key anzeigen" aria-label="API-Key anzeigen" aria-pressed="false">&#128065;</button>
+      <label>API Key</label>
+      <input type="password" class="key-input" id="accField_apiKey" value="${escapeAttr(account.apiKey || '')}" placeholder="API Key">
+      <button class="toggle-vis" type="button" title="Anzeigen">&#128065;</button>
    </div>`;
 }

-function wireCredentialVisibilityButtons(container) {
-  container.querySelectorAll('.toggle-vis').forEach(btn => {
-    btn.addEventListener('click', () => {
-      const input = btn.previousElementSibling;
-      const visible = input.type === 'password';
-      const fieldName = input.id === 'accField_apiKey' ? 'API-Key' : 'Passwort';
-      input.type = visible ? 'text' : 'password';
-      btn.setAttribute('aria-pressed', String(visible));
-      btn.setAttribute('aria-label', `${fieldName} ${visible ? 'verbergen' : 'anzeigen'}`);
-      btn.title = `${fieldName} ${visible ? 'verbergen' : 'anzeigen'}`;
-    });
-  });
-}
-
-let _accountModalReturnFocus = null;
-
 function openAccountModal(editAccountId) {
-  _accountModalReturnFocus = document.activeElement instanceof HTMLElement ? document.activeElement : null;
  editingAccountId = editAccountId || null;
+  // Reset the two-step state — any previously validated snapshot from a prior
+  // modal session is stale and must not allow a no-recheck commit.
  _resetAccountModalState();
  const modal = document.getElementById('accountModal');
  const title = document.getElementById('accountModalTitle');
@ -4326,17 +4219,17 @@ function openAccountModal(editAccountId) {
    const found = findAccountById(editingAccountId);
    if (!found) return;
    title.textContent = 'Account bearbeiten';
-    subtitle.textContent = `Zugangsdaten für ${getAccountDisplayName(found.name, found.account)} bearbeiten und prüfen.`;
+    subtitle.textContent = `Zugangsdaten für ${getAccountDisplayName(found.name, found.account)} bearbeiten.`;
    hosterRow.style.display = 'none';
-    saveBtn.textContent = window.AccountSubmit.getAccountSubmitLabel({ isEdit: true });
+    saveBtn.textContent = 'Prüfen';
    if (labelInput) labelInput.value = found.account.label || '';
    credsContainer.innerHTML = getCredsFieldsHtml(found.account.authType || 'login', found.account, found.name);
  } else {
    // Add mode — always show all options (multiple accounts per hoster allowed)
    title.textContent = 'Account hinzufügen';
-    subtitle.textContent = 'Wähle einen Hoster und gib deine Zugangsdaten ein. Der Account wird vor dem Anlegen geprüft.';
+    subtitle.textContent = 'Wähle einen Hoster und gib deine Zugangsdaten ein. Erst „Prüfen" klicken; nach grünem Login wird daraus „Anlegen".';
    hosterRow.style.display = 'flex';
-    saveBtn.textContent = window.AccountSubmit.getAccountSubmitLabel({ isEdit: false });
+    saveBtn.textContent = 'Prüfen';
    hosterSelect.innerHTML = HOSTER_ADD_OPTIONS.map(opt =>
      `<option value="${opt.value}">${escapeHtml(opt.label)}</option>`
    ).join('');
@ -4345,30 +4238,32 @@ function openAccountModal(editAccountId) {
    credsContainer.innerHTML = getCredsFieldsHtml(firstOpt.authType, {}, firstOpt.value);
  }

-  wireCredentialVisibilityButtons(credsContainer);
+  // Toggle visibility buttons
+  credsContainer.querySelectorAll('.toggle-vis').forEach(btn => {
+    btn.addEventListener('click', () => {
+      const input = btn.previousElementSibling;
+      input.type = input.type === 'password' ? 'text' : 'password';
+    });
+  });

+  // Wire field invalidation: any change to a cred field after a green check
+  // drops the validated snapshot so the next click is a re-check, not a commit
+  // of unverified creds. Re-wired here every open because credsContainer's HTML
+  // was replaced.
  _wireCredFieldInvalidation();

  modal.style.display = 'flex';
-  requestAnimationFrame(() => {
-    const firstControl = editingAccountId
-      ? document.getElementById('accField_label')
-      : hosterSelect;
-    if (firstControl) firstControl.focus();
-  });
 }

 function closeAccountModal() {
  document.getElementById('accountModal').style.display = 'none';
  _hideOtpField();
  editingAccountId = null;
-  _resetAccountModalState();
-  const returnFocus = _accountModalReturnFocus;
-  _accountModalReturnFocus = null;
-  const focusTarget = returnFocus && returnFocus.isConnected
-    ? returnFocus
-    : document.getElementById('addAccountBtn');
-  if (focusTarget) focusTarget.focus();
+  // Cancel any pending auto-close so a stale timer can't close a future modal
+  // the user reopens within the auto-close window.
+  if (_autoCloseTimer) { clearTimeout(_autoCloseTimer); _autoCloseTimer = null; }
+  _validatedCreds = null;
+  _accountModalBusy = false;
 }

 function openDeleteAccountModal(accountId) {
@ -4424,54 +4319,66 @@ function readAccountCredsFromModal(authType) {
  return { enabled: !!apiKey, authType: 'api', apiKey, label };
 }

-const _accountSubmitter = window.AccountSubmit.createAccountSubmitter();
-let _accountModalCommitLocked = false;
+// --- Two-step account-modal state machine ---
+//
+// Goal: never persist invalid/unverified credentials to config.hosters. The
+// user clicks "Prüfen" → ephemeral validate-credentials IPC runs → on green
+// the button label flips to "Anlegen" / "Speichern" → the next click commits
+// to config. Editing any cred field between the two clicks drops the validated
+// snapshot so the user can't sneak unverified creds through by editing
+// post-green.
+//
+// Invariants enforced here:
+//  1. Nothing reaches config.hosters until _validatedCreds matches a green
+//     result for the currently-typed creds.
+//  2. _accountModalBusy is set SYNCHRONOUSLY at the top of the click handler
+//     before any await — guards against double-clicks producing duplicates.
+//  3. OTP retry stays ephemeral: each retry re-runs validate-credentials with
+//     the new OTP, no config writes until green.
+//  4. Edit mode hits the same path → bad edits never overwrite known-good
+//     creds on disk.
+let _accountModalBusy = false;
+let _validatedCreds = null; // { hosterName, authType, snapshot, status } when green
 let _autoCloseTimer = null;
+// Session token used to ignore stale validate-credentials responses: if the
+// user closes the modal mid-flight and reopens it, the late .then must NOT
+// stomp the new session's state. Bumped on every modal reset.
 let _accountModalSession = 0;

 function _resetAccountModalState() {
+  _accountModalBusy = false;
+  _validatedCreds = null;
  _accountModalSession++;
-  _accountModalCommitLocked = false;
  if (_autoCloseTimer) { clearTimeout(_autoCloseTimer); _autoCloseTimer = null; }
-  _syncAccountSubmitButton();
 }

 function _credsSnapshotKey(authType, creds) {
+  // Identity key for the typed creds — used to detect post-validation edits.
+  // Label changes do NOT invalidate (label is metadata, not a credential).
  if (authType === 'login') return `login:${creds.username || ''}:${creds.password || ''}`;
  return `api:${creds.apiKey || ''}`;
 }

-function _defaultAccountSubmitButtonText(ctx) {
-  return window.AccountSubmit.getAccountSubmitLabel({ isEdit: !!(ctx && ctx.isEdit) });
-}
-
-function _syncAccountSubmitButton() {
-  const saveBtn = document.getElementById('saveAccountBtn');
-  if (!saveBtn) return;
-  saveBtn.textContent = _defaultAccountSubmitButtonText(_determineHosterContext());
-  saveBtn.disabled = _accountSubmitter.isBusy() || _accountModalCommitLocked;
-}
-
-function _invalidateAccountSubmit() {
-  _accountModalSession++;
-  const statusEl = document.getElementById('accountModalStatus');
-  if (statusEl) {
-    statusEl.textContent = '';
-    statusEl.className = 'account-modal-status';
-  }
-  const saveBtn = document.getElementById('saveAccountBtn');
-  if (saveBtn && !_accountSubmitter.isBusy() && !_accountModalCommitLocked) {
-    saveBtn.disabled = false;
-    saveBtn.textContent = _defaultAccountSubmitButtonText(_determineHosterContext());
-  }
-}
-
 function _wireCredFieldInvalidation() {
+  // Any change to a cred IDENTITY field (username/password/apiKey) clears the
+  // validated snapshot and reverts the button to "Prüfen". Label edits don't
+  // invalidate (label is metadata, not a credential). OTP edits don't either:
+  // OTP is an ephemeral auth challenge — once doodstream returned "ok" for
+  // these username+password+OTP, the resulting trust is on the creds; the user
+  // clearing or fixing the OTP field afterward shouldn't force a re-prompt.
  const ids = ['accField_username', 'accField_password', 'accField_apiKey'];
  for (const id of ids) {
    const el = document.getElementById(id);
    if (!el || el.dataset.invalidateBound === '1') continue;
-    el.addEventListener('input', _invalidateAccountSubmit);
+    el.addEventListener('input', () => {
+      if (_validatedCreds) {
+        _validatedCreds = null;
+        const saveBtn = document.getElementById('saveAccountBtn');
+        if (saveBtn) saveBtn.textContent = 'Prüfen';
+        const statusEl = document.getElementById('accountModalStatus');
+        if (statusEl) { statusEl.textContent = ''; statusEl.className = 'account-modal-status'; }
+      }
+    });
    el.dataset.invalidateBound = '1';
  }
 }
@ -4489,18 +4396,12 @@ function _determineHosterContext() {
  return { hosterName: opt.hoster, authType: opt.authType, accountId: null, isEdit: false };
 }

-function _isAccountSubmitCurrent(session, ctx, snapshotKey) {
-  if (session !== _accountModalSession) return false;
-  const currentCtx = _determineHosterContext();
-  if (!currentCtx) return false;
-  if (currentCtx.hosterName !== ctx.hosterName || currentCtx.authType !== ctx.authType) return false;
-  if (currentCtx.accountId !== ctx.accountId || currentCtx.isEdit !== ctx.isEdit) return false;
-  const currentCreds = readAccountCredsFromModal(currentCtx.authType);
-  return _credsSnapshotKey(currentCtx.authType, currentCreds) === snapshotKey;
-}
-
 async function saveAccount() {
-  if (_accountSubmitter.isBusy() || _accountModalCommitLocked) return;
+  // SYNCHRONOUS re-entry guard — must come before any await. Without this a
+  // double-click before the first IPC returns triggers two saveAccount() calls
+  // and (in the old code) two pushes/two IPCs. _accountModalBusy is checked
+  // synchronously and set synchronously, so the second click no-ops cleanly.
+  if (_accountModalBusy) return;

  const ctx = _determineHosterContext();
  if (!ctx) return;
@ -4513,8 +4414,37 @@ async function saveAccount() {
    return;
  }

+  // STEP 2: commit. Only fires if a previous "Prüfen" already validated the
+  // EXACT same creds (label changes don't break this — label isn't part of the
+  // credential identity).
  const snapshotKey = _credsSnapshotKey(ctx.authType, creds);
+  if (_validatedCreds &&
+      _validatedCreds.hosterName === ctx.hosterName &&
+      _validatedCreds.authType === ctx.authType &&
+      _validatedCreds.snapshot === snapshotKey) {
+    // Set busy INSIDE the try so a sync throw on the saveBtn deref above can't
+    // leak _accountModalBusy=true and lock the user out for the session.
+    try {
+      _accountModalBusy = true;
+      saveBtn.disabled = true;
+      saveBtn.textContent = ctx.isEdit ? 'Speichere…' : 'Lege an…';
+      await _commitAccount(ctx, creds, _validatedCreds.status, _validatedCreds.message);
+    } finally {
+      _accountModalBusy = false;
+      if (saveBtn) saveBtn.disabled = false;
+    }
+    return;
+  }
+
+  // STEP 1: validate ephemerally. NOTHING is written to config.hosters here.
+  // Snapshot the session token so a stale late-arriving response from a
+  // closed-and-reopened modal can't stomp the new session's state.
  const mySession = _accountModalSession;
+  _accountModalBusy = true;
+  saveBtn.disabled = true;
+  statusEl.textContent = 'Prüfe Login…';
+  statusEl.className = 'account-modal-status checking';
+
  const otpInput = document.getElementById('accField_otp');
  const otp = otpInput ? otpInput.value.trim() : '';
  const payload = {
@ -4526,100 +4456,94 @@ async function saveAccount() {
    otp
  };

-  const submission = _accountSubmitter.submit({
-    validate: () => window.api.validateCredentials(payload),
-    commit: () => _persistAccount(ctx, creds),
-    afterCommit: (persisted, validation) => _applyCommittedAccount(persisted, validation),
-    isCurrent: () => _isAccountSubmitCurrent(mySession, ctx, snapshotKey)
-  });
-  if (!submission) return;
-  saveBtn.disabled = true;
-  saveBtn.textContent = _defaultAccountSubmitButtonText(ctx);
-  statusEl.textContent = 'Prüfe Zugangsdaten…';
-  statusEl.className = 'account-modal-status checking';
-
-  let result;
+  let row;
  try {
-    result = await submission;
-  } catch (error) {
-    result = { status: 'error', error };
+    row = await window.api.validateCredentials(payload);
+  } catch (err) {
+    row = { status: 'error', message: err && err.message ? err.message : 'Prüfung fehlgeschlagen' };
+  } finally {
+    if (mySession === _accountModalSession) {
+      _accountModalBusy = false;
+      if (saveBtn) saveBtn.disabled = false;
+    }
  }

-  const current = _isAccountSubmitCurrent(mySession, ctx, snapshotKey);
-  if (result.status === 'committed' && current) {
-    _accountModalCommitLocked = true;
-    const validation = result.validation || {};
-    statusEl.textContent = validation.status === 'warn'
-      ? validation.message || 'Account wurde mit Warnung geprüft und gespeichert.'
-      : validation.message || 'Account wurde erfolgreich geprüft und gespeichert.';
-    statusEl.className = 'account-modal-status ok';
-    _hideOtpField();
-    saveBtn.textContent = _defaultAccountSubmitButtonText(ctx);
-    saveBtn.disabled = true;
-    if (_autoCloseTimer) clearTimeout(_autoCloseTimer);
-    _autoCloseTimer = setTimeout(() => {
-      _autoCloseTimer = null;
-      closeAccountModal();
-    }, 600);
-    return;
-  }
+  // Stale response — modal was closed/reopened while we awaited. Drop it.
+  if (mySession !== _accountModalSession) return;

-  _syncAccountSubmitButton();
-  if (!current) return;
-
-  if (result.status === 'otp_required') {
-    const validation = result.validation || {};
-    statusEl.textContent = validation.message || 'OTP wurde an deine E-Mail gesendet.';
+  if (row && row.status === 'otp_required') {
+    statusEl.textContent = row.message || 'OTP wurde an deine E-Mail gesendet.';
    statusEl.className = 'account-modal-status error';
    _showOtpField();
-    saveBtn.textContent = _defaultAccountSubmitButtonText(ctx);
+    _wireCredFieldInvalidation(); // OTP input now exists — wire its listener too
+    saveBtn.textContent = 'Mit OTP prüfen';
    return;
  }
-
-  const validation = result.validation || {};
-  const msg = result.status === 'error'
-    ? (result.error && result.error.message) || 'Prüfung oder Speichern fehlgeschlagen'
-    : validation.message || 'Login fehlgeschlagen';
+  if (row && (row.status === 'ok' || row.status === 'warn')) {
+    statusEl.textContent = row.status === 'warn' ? row.message || 'Prüfung mit Warnung abgeschlossen.' : 'Login erfolgreich! Klick „' + (ctx.isEdit ? 'Speichern' : 'Anlegen') + '" zum Übernehmen.';
+    statusEl.className = 'account-modal-status ok';
+    _hideOtpField();
+    _validatedCreds = {
+      hosterName: ctx.hosterName,
+      authType: ctx.authType,
+      snapshot: snapshotKey,
+      status: row.status,
+      message: row.message || ''
+    };
+    saveBtn.textContent = ctx.isEdit ? 'Speichern' : 'Anlegen';
+    return;
+  }
+  // error
+  const msg = (row && row.message) || 'Login fehlgeschlagen';
  statusEl.textContent = msg;
  statusEl.className = 'account-modal-status error';
 }

-function _copyHosterTree(hosters) {
-  const candidate = {};
-  for (const [name, accounts] of Object.entries(hosters || {})) {
-    candidate[name] = Array.isArray(accounts) ? accounts.map(account => ({ ...account })) : accounts;
-  }
-  return candidate;
-}
-
-async function _persistAccount(ctx, creds) {
-  const candidateHosters = _copyHosterTree(config.hosters);
-  if (!Array.isArray(candidateHosters[ctx.hosterName])) candidateHosters[ctx.hosterName] = [];
-  let accountId = ctx.accountId;
+async function _commitAccount(ctx, creds, validatedStatus, validatedMessage) {
+  // Persist the validated creds to config.hosters and close the modal. By the
+  // time we reach this function the validate-credentials IPC has already
+  // returned ok/warn for these exact creds, so we skip a redundant re-check.
+  let accountId;
+  if (!Array.isArray(config.hosters[ctx.hosterName])) config.hosters[ctx.hosterName] = [];
  if (ctx.isEdit) {
-    const idx = candidateHosters[ctx.hosterName].findIndex(account => account.id === accountId);
-    if (idx < 0) throw new Error('Account nicht mehr in der Config — wurde extern gelöscht. Modal schließen und neu anlegen.');
-    candidateHosters[ctx.hosterName][idx] = { ...candidateHosters[ctx.hosterName][idx], ...creds };
+    accountId = ctx.accountId;
+    const idx = config.hosters[ctx.hosterName].findIndex(a => a.id === accountId);
+    if (idx >= 0) {
+      config.hosters[ctx.hosterName][idx] = { ...config.hosters[ctx.hosterName][idx], ...creds };
+    } else {
+      _accountModalBusy = false;
+      const _sb = document.getElementById('saveAccountBtn'); if (_sb) _sb.disabled = false;
+      const _st = document.getElementById('accountModalStatus');
+      if (_st) {
+        _st.textContent = 'Account nicht mehr in der Config — wurde extern gelöscht. Modal schließen und neu anlegen.';
+        _st.className = 'account-modal-status error';
+      }
+      return;
+    }
  } else {
    accountId = `${ctx.hosterName}-${Date.now()}-${Math.random().toString(36).slice(2, 6)}`;
-    candidateHosters[ctx.hosterName].push({ id: accountId, ...creds });
+    config.hosters[ctx.hosterName].push({ id: accountId, ...creds });
  }
-  await window.api.saveConfig({ hosters: candidateHosters });
-  return { accountId, candidateHosters, isEdit: ctx.isEdit };
-}
-
-function _applyCommittedAccount(persisted, validation) {
-  const { accountId, candidateHosters, isEdit } = persisted;
-  config.hosters = candidateHosters;
-  accountStatuses[accountId] = { status: validation.status, message: validation.message || '' };
+  await window.api.saveConfig({ hosters: config.hosters });
+  // Skip the redundant await getConfig() — the in-memory state is the source
+  // of truth for what we just wrote, decrypted creds didn't change, and the
+  // round-trip was the main lag source on add/delete.
+  accountStatuses[accountId] = { status: validatedStatus, message: validatedMessage || '' };
  ensureAccountStatusEntries();
  syncSelectedUploadHosters();
-  if (isEdit) {
+  // Targeted updates instead of the 4-panel cascade. For add we need a full
+  // accounts-list re-render (new card) and the hoster summary count; for edit
+  // we can update the single card. Settings panel only needs re-render if its
+  // hoster-summary section is visible — that's covered by renderHosterSummary.
+  if (ctx.isEdit) {
    updateAccountCard(accountId);
  } else {
    renderAccounts();
  }
  renderHosterSummary();
+  // Auto-close after a short pause so the user sees the success state.
+  if (_autoCloseTimer) clearTimeout(_autoCloseTimer);
+  _autoCloseTimer = setTimeout(() => { closeAccountModal(); _autoCloseTimer = null; }, 600);
 }

 function _showOtpField() {
@ -4644,8 +4568,6 @@ function _hideOtpField() {
 async function loadHistory() {
  const history = await window.api.getHistory();
  window._historyForStats = history || [];
-  _historyEverLoaded = true;
-  _historyDirty = false;
  _invalidateHosterLifetimeCache();
  const retSel = document.getElementById('historyRetentionSelect');
  if (retSel) retSel.value = (config.globalSettings && config.globalSettings.historyRetention) || 'all';
@ -4752,67 +4674,54 @@ function _buildRecentRowHtml(row) {
 let _recentLastRenderedSig = '';
 let _recentLastRenderedLen = 0;
 let _recentPendingAppends = 0;
-let _recentWorking = [];
-let _recentLastRange = { start: -1, end: -1 };
-let _recentScrollQueued = false;
-
-function _onRecentScroll() {
-  if (_recentScrollQueued) return;
-  _recentScrollQueued = true;
-  requestAnimationFrame(() => { _recentScrollQueued = false; _renderRecentVirtualRows(); });
-}
-
-function _renderRecentVirtualRows() {
-  const wrap = document.querySelector('.recent-files-table-wrap');
-  const tbody = document.getElementById('recentFilesBody');
-  if (!wrap || !tbody) return;
-  const total = _recentWorking.length;
-  if (!total) return;
-  const scrollTop = wrap.scrollTop;
-  const viewportHeight = Math.max(wrap.clientHeight, 400);
-  const startIdx = Math.max(0, Math.floor(scrollTop / VIRTUAL_ROW_HEIGHT) - VIRTUAL_OVERSCAN);
-  const endIdx = Math.min(total, Math.ceil((scrollTop + viewportHeight) / VIRTUAL_ROW_HEIGHT) + VIRTUAL_OVERSCAN);
-  if (startIdx === _recentLastRange.start && endIdx === _recentLastRange.end) return;
-  _recentLastRange = { start: startIdx, end: endIdx };
-  const topPad = startIdx * VIRTUAL_ROW_HEIGHT;
-  const bottomPad = Math.max(0, (total - endIdx) * VIRTUAL_ROW_HEIGHT);
-  const parts = [];
-  if (topPad > 0) parts.push(`<tr class="virtual-spacer" style="height:${topPad}px"><td colspan="4"></td></tr>`);
-  for (let i = startIdx; i < endIdx; i++) parts.push(_buildRecentRowHtml(_recentWorking[i]));
-  if (bottomPad > 0) parts.push(`<tr class="virtual-spacer" style="height:${bottomPad}px"><td colspan="4"></td></tr>`);
-  tbody.innerHTML = parts.join('');
-}

 function renderRecentUploadsPanel(appendOnly = false) {
  const tbody = document.getElementById('recentFilesBody');
  if (!tbody) return;
+  const pendingAppends = _recentPendingAppends;
  _recentPendingAppends = 0;
-  const wrap = tbody.closest('.recent-files-table-wrap');
-
  if (!sessionFilesData.length) {
    tbody.innerHTML = '<tr><td colspan="4" class="empty-state">Noch keine Uploads in dieser Session.</td></tr>';
-    _recentWorking = [];
-    _recentLastRange = { start: -1, end: -1 };
-  } else {
-    const prevLen = _recentWorking.length;
-    _recentWorking = sortRecentFiles(sessionFilesData);
-    _recentLastRange = { start: -1, end: -1 };
+    _recentLastRenderedSig = '';
+    _recentLastRenderedLen = 0;
+    return;
+  }
+
+  const rows = sortRecentFiles(sessionFilesData);
  const sig = `${recentSortState.key}|${recentSortState.direction}`;
-    if (wrap) {
-      const added = _recentWorking.length - prevLen;
-      if (sig === 'date|desc' && wrap.scrollTop <= 48) wrap.scrollTop = 0;
-      else if (sig === 'date|desc' && added > 0) wrap.scrollTop += added * VIRTUAL_ROW_HEIGHT;
+  const dateDescAppendOnly = appendOnly
+    && pendingAppends > 0
+    && sig === 'date|desc'
+    && _recentLastRenderedSig === sig
+    && tbody.querySelectorAll('.recent-file-row').length === _recentLastRenderedLen;
+
+  const wrap = tbody.closest('.recent-files-table-wrap');
+  const wasAtTop = !wrap || wrap.scrollTop <= 48;
+
+  let wasAppendOnly = false;
+  if (dateDescAppendOnly) {
+    const added = Math.min(pendingAppends, rows.length);
+    let html = '';
+    for (let i = 0; i < added; i++) html += _buildRecentRowHtml(rows[i]);
+    tbody.insertAdjacentHTML('afterbegin', html);
+    let evict = (_recentLastRenderedLen + added) - rows.length;
+    while (evict > 0) {
+      const last = tbody.lastElementChild;
+      if (!last) break;
+      last.remove();
+      evict--;
    }
-    _renderRecentVirtualRows();
+    wasAppendOnly = true;
+  } else {
+    tbody.innerHTML = rows.map(_buildRecentRowHtml).join('');
  }
+  if (wrap && sig === 'date|desc' && wasAtTop) wrap.scrollTop = 0;
+  _recentLastRenderedSig = sig;
+  _recentLastRenderedLen = rows.length;

  // Event delegation – bind once, not per-row
  if (!_recentListenersBound) {
    _recentListenersBound = true;
-    if (wrap) {
-      wrap.addEventListener('scroll', _onRecentScroll, { passive: true });
-      if (typeof window.ResizeObserver !== 'undefined') new window.ResizeObserver(_onRecentScroll).observe(wrap);
-    }
    tbody.addEventListener('click', (e) => {
      const tr = e.target.closest('.recent-file-row');
      if (!tr) return;
@ -4851,63 +4760,17 @@ function renderRecentUploadsPanel(appendOnly = false) {
    });
  }

-  updateRecentSortHeaders();
+  // Sort headers only change when the sort state changes — skip on appends.
+  if (!wasAppendOnly) updateRecentSortHeaders();
 }

 const HISTORY_RENDER_CAP = 2000;
-let _historyWorking = [];
-let _historyLastRange = { start: -1, end: -1 };
-let _historyListenersBound = false;
-let _historyScrollQueued = false;
-
-function _onHistoryScroll() {
-  if (_historyScrollQueued) return;
-  _historyScrollQueued = true;
-  requestAnimationFrame(() => { _historyScrollQueued = false; _renderHistoryVirtualRows(); });
-}
-
-function _renderHistoryVirtualRows() {
-  const container = document.getElementById('historyContainer');
-  const tbody = document.getElementById('historyBody');
-  if (!container || !tbody) return;
-  const total = _historyWorking.length;
-  const scrollTop = container.scrollTop;
-  const viewportHeight = Math.max(container.clientHeight, 600);
-  const startIdx = Math.max(0, Math.floor(scrollTop / VIRTUAL_ROW_HEIGHT) - VIRTUAL_OVERSCAN);
-  const endIdx = Math.min(total, Math.ceil((scrollTop + viewportHeight) / VIRTUAL_ROW_HEIGHT) + VIRTUAL_OVERSCAN);
-  if (startIdx === _historyLastRange.start && endIdx === _historyLastRange.end) return;
-  _historyLastRange = { start: startIdx, end: endIdx };
-  const topPad = startIdx * VIRTUAL_ROW_HEIGHT;
-  const bottomPad = Math.max(0, (total - endIdx) * VIRTUAL_ROW_HEIGHT);
-  const parts = [];
-  if (topPad > 0) parts.push(`<tr class="virtual-spacer" style="height:${topPad}px"><td colspan="4"></td></tr>`);
-  for (let i = startIdx; i < endIdx; i++) {
-    const row = _historyWorking[i];
-    const link = row.link || '';
-    parts.push('<tr class="history-row');
-    if (row.isError) parts.push(' error');
-    parts.push('" data-link="');
-    parts.push(escapeAttr(link));
-    parts.push(`" style="height:${VIRTUAL_ROW_HEIGHT}px"><td class="col-date">`);
-    parts.push(escapeHtml(row.date));
-    parts.push('</td><td class="col-filename">');
-    parts.push(escapeHtml(row.filename));
-    parts.push('</td><td class="col-host">');
-    parts.push(escapeHtml(row.host));
-    parts.push('</td><td class="col-link">');
-    parts.push(escapeHtml(link));
-    parts.push('</td></tr>');
-  }
-  if (bottomPad > 0) parts.push(`<tr class="virtual-spacer" style="height:${bottomPad}px"><td colspan="4"></td></tr>`);
-  tbody.innerHTML = parts.join('');
-}

 function renderHistoryTable(container) {
  if (!container || !historyRowsData.length) {
    if (container) container.innerHTML = '<p class="empty-state">Noch keine Uploads.</p>';
    const emptyNotice = document.getElementById('historyCapNotice');
    if (emptyNotice) emptyNotice.style.display = 'none';
-    _historyWorking = [];
    return;
  }

@ -4923,22 +4786,50 @@ function renderHistoryTable(container) {
    }
  }

-  _historyWorking = sortHistoryRows(working);
-  _historyLastRange = { start: -1, end: -1 };
+  const rows = sortHistoryRows(working);
  const headerCell = (key, label) => {
    const active = historySortState.key === key;
    const dir = active ? (historySortState.direction === 'asc' ? '▲' : '▼') : '↕';
    return `<th class="sortable${active ? ' active' : ''}" data-history-sort="${key}">${label}<span class="sort-indicator">${dir}</span></th>`;
  };

-  container.innerHTML = `<table class="results-table history-table"><thead><tr>
-    ${headerCell('date', 'Datum')}${headerCell('filename', 'Dateiname')}${headerCell('host', 'Hoster')}${headerCell('link', 'Link')}
-  </tr></thead><tbody id="historyBody"></tbody></table>`;
+  let html = `<table class="results-table history-table"><thead><tr>
+    ${headerCell('date', 'Date')}${headerCell('filename', 'Filename')}${headerCell('host', 'Host')}${headerCell('link', 'Link')}
+  </tr></thead><tbody>`;

-  if (!_historyListenersBound) {
-    _historyListenersBound = true;
-    container.addEventListener('scroll', _onHistoryScroll, { passive: true });
-    if (typeof window.ResizeObserver !== 'undefined') new window.ResizeObserver(_onHistoryScroll).observe(container);
+  const parts = [html];
+  const len = rows.length;
+  for (let i = 0; i < len; i++) {
+    const row = rows[i];
+    const link = row.link || '';
+    const date = escapeHtml(row.date);
+    const filename = escapeHtml(row.filename);
+    const host = escapeHtml(row.host);
+    const linkHtml = escapeHtml(link);
+    const linkAttr = escapeAttr(link);
+    parts.push('<tr class="history-row');
+    if (row.isError) parts.push(' error');
+    parts.push('" data-link="');
+    parts.push(linkAttr);
+    parts.push('"><td class="col-date">');
+    parts.push(date);
+    parts.push('</td><td class="col-filename">');
+    parts.push(filename);
+    parts.push('</td><td class="col-host">');
+    parts.push(host);
+    parts.push('</td><td class="col-link">');
+    parts.push(linkHtml);
+    parts.push('</td></tr>');
+  }
+  parts.push('</tbody></table>');
+  container.innerHTML = parts.join('');
+
+  // Delegated listeners: bind once per render-target instead of once per
+  // row/header. With a 5000-row history the per-row bind path was a
+  // 5000-iteration synchronous loop on every Verlauf-tab switch — the
+  // dominant cause of "tab switching lags" in the user report.
+  if (!container.dataset.historyListenersBound) {
+    container.dataset.historyListenersBound = '1';
    container.addEventListener('click', (e) => {
      const th = e.target.closest('th.sortable');
      if (th && container.contains(th)) {
@ -4951,7 +4842,6 @@ function renderHistoryTable(container) {
        } else {
          historySortState.direction = historySortState.direction === 'asc' ? 'desc' : 'asc';
        }
-        container.scrollTop = 0;
        renderHistoryTable(container);
        return;
      }
@ -4962,8 +4852,6 @@ function renderHistoryTable(container) {
      }
    });
  }
-
-  _renderHistoryVirtualRows();
 }

 function sortHistoryRows(rows) {
@ -5184,12 +5072,25 @@ function setupListeners() {

  // Account hoster select change → update credential fields
  document.getElementById('accountHosterSelect').addEventListener('change', (e) => {
-    _invalidateAccountSubmit();
    const opt = HOSTER_ADD_OPTIONS.find(o => o.value === e.target.value);
    const authType = opt ? opt.authType : 'login';
    const credsContainer = document.getElementById('accountCredsFields');
    credsContainer.innerHTML = getCredsFieldsHtml(authType, {}, e.target.value);
-    wireCredentialVisibilityButtons(credsContainer);
+    credsContainer.querySelectorAll('.toggle-vis').forEach(btn => {
+      btn.addEventListener('click', () => {
+        const input = btn.previousElementSibling;
+        input.type = input.type === 'password' ? 'text' : 'password';
+      });
+    });
+    document.getElementById('accountModalStatus').textContent = '';
+    document.getElementById('accountModalStatus').className = 'account-modal-status';
+    // Hoster changed → any prior validation is stale by construction. Drop the
+    // snapshot and revert the button so the user has to re-Prüfen.
+    _validatedCreds = null;
+    const sb = document.getElementById('saveAccountBtn');
+    if (sb) sb.textContent = 'Prüfen';
+    // The cred inputs were just replaced — rewire invalidation listeners on
+    // the fresh elements so post-validation edits still revert the button.
    _wireCredFieldInvalidation();
  });

@ -5233,7 +5134,7 @@ function showUpdateBanner(info) {
 function handleUpdateProgress(data) {
  const msg = document.getElementById('updateMessage');
  if (!msg) return;
-  if (data.stage === 'downloading') msg.textContent = `Wird heruntergeladen… ${data.percent || 0}%`;
+  if (data.stage === 'downloading') msg.textContent = `Downloading... ${data.percent || 0}%`;
  else if (data.stage === 'verifying') msg.textContent = 'Verifiziere...';
  else if (data.stage === 'launching') msg.textContent = 'Setup wird gestartet...';
  else if (data.stage === 'done') msg.textContent = 'Update installiert. App wird neu gestartet...';
--- a/renderer/index.html
+++ b/renderer/index.html
@ -66,11 +66,11 @@
    </div>
  </nav>

-  <nav class="tab-bar" role="tablist" aria-label="Hauptbereiche">
-    <button class="tab active" id="upload-tab" role="tab" aria-selected="true" aria-controls="upload-view" tabindex="0" data-view="upload">Upload</button>
-    <button class="tab" id="accounts-tab" role="tab" aria-selected="false" aria-controls="accounts-view" tabindex="-1" data-view="accounts">Accounts</button>
-    <button class="tab" id="settings-tab" role="tab" aria-selected="false" aria-controls="settings-view" tabindex="-1" data-view="settings">Einstellungen</button>
-    <button class="tab" id="history-tab" role="tab" aria-selected="false" aria-controls="history-view" tabindex="-1" data-view="history">Verlauf</button>
+  <nav class="tab-bar">
+    <button class="tab active" data-view="upload">Upload</button>
+    <button class="tab" data-view="accounts">Accounts</button>
+    <button class="tab" data-view="settings">Einstellungen</button>
+    <button class="tab" data-view="history">Verlauf</button>
    <span class="version-label" id="versionLabel"></span>
  </nav>

@ -80,7 +80,7 @@
    <button class="btn btn-sm btn-secondary" id="dismissUpdateBtn">&times;</button>
  </div>

-  <div id="upload-view" class="view active" role="tabpanel" aria-labelledby="upload-tab">
+  <div id="upload-view" class="view active">
    <div class="upload-toolbar">
      <div class="toolbar-left">
        <span class="hoster-summary" id="hosterSummary" style="display:none"></span>
@ -99,35 +99,35 @@

      <div class="queue-shell" id="queueShell" style="display:none">
        <div class="queue-command-bar" id="queueCommandBar">
-          <button class="toolbar-btn" id="startUploadBtn" title="Alle Uploads starten" aria-label="Alle Uploads starten" disabled>
-            <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16"><path d="M4 2l10 6-10 6z" fill="#4caf50"/></svg>
+          <button class="toolbar-btn" id="startUploadBtn" title="Start all" disabled>
+            <svg width="16" height="16" viewBox="0 0 16 16"><path d="M4 2l10 6-10 6z" fill="#4caf50"/></svg>
          </button>
-          <button class="toolbar-btn" id="startSelectedBtn" title="Ausgewählte Uploads starten" aria-label="Ausgewählte Uploads starten" disabled>
-            <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16"><path d="M6 3l8 5-8 5z" fill="#4caf50"/><rect x="1" y="3" width="3" height="10" rx="0.5" fill="#4caf50"/></svg>
+          <button class="toolbar-btn" id="startSelectedBtn" title="Start selected" disabled>
+            <svg width="16" height="16" viewBox="0 0 16 16"><path d="M6 3l8 5-8 5z" fill="#4caf50"/><rect x="1" y="3" width="3" height="10" rx="0.5" fill="#4caf50"/></svg>
          </button>
-          <button class="toolbar-btn" id="reuploadSelectedBtn" title="Ausgewählte Datei erneut hochladen" aria-label="Ausgewählte Datei erneut hochladen">
-            <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16"><path d="M8 1a7 7 0 0 0-5 2.1V1H2v4h4V4H3.7A5.5 5.5 0 1 1 2.5 8H1a7 7 0 1 0 7-7z" fill="#4caf50"/></svg>
+          <button class="toolbar-btn" id="reuploadSelectedBtn" title="Reupload selected file">
+            <svg width="16" height="16" viewBox="0 0 16 16"><path d="M8 1a7 7 0 0 0-5 2.1V1H2v4h4V4H3.7A5.5 5.5 0 1 1 2.5 8H1a7 7 0 1 0 7-7z" fill="#4caf50"/></svg>
          </button>
-          <button class="toolbar-btn" id="abortSelectedBtn" title="Ausgewählten Upload abbrechen" aria-label="Ausgewählten Upload abbrechen">
-            <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16"><rect x="3" y="3" width="10" height="10" rx="1" fill="#e53935"/><path d="M5.5 5.5l5 5M10.5 5.5l-5 5" stroke="#fff" stroke-width="1.5" stroke-linecap="round"/></svg>
+          <button class="toolbar-btn" id="abortSelectedBtn" title="Abort selected file">
+            <svg width="16" height="16" viewBox="0 0 16 16"><rect x="3" y="3" width="10" height="10" rx="1" fill="#e53935"/><path d="M5.5 5.5l5 5M10.5 5.5l-5 5" stroke="#fff" stroke-width="1.5" stroke-linecap="round"/></svg>
          </button>
-          <button class="toolbar-btn" id="finishStopBtn" title="Aktive Uploads beenden und stoppen" aria-label="Aktive Uploads beenden und stoppen">
-            <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16"><path d="M2 8l4 4 8-8" stroke="#4caf50" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"/><rect x="11" y="9" width="5" height="5" rx="1" fill="#e53935"/></svg>
+          <button class="toolbar-btn" id="finishStopBtn" title="Finish Uploads in Progress and Stop">
+            <svg width="16" height="16" viewBox="0 0 16 16"><path d="M2 8l4 4 8-8" stroke="#4caf50" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"/><rect x="11" y="9" width="5" height="5" rx="1" fill="#e53935"/></svg>
          </button>
-          <button class="toolbar-btn toolbar-btn-danger" id="abortAllBtn" title="Alle Uploads abbrechen" aria-label="Alle Uploads abbrechen">
-            <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16"><rect x="1" y="1" width="14" height="14" rx="2" fill="#e53935"/><path d="M4.5 4.5l7 7M11.5 4.5l-7 7" stroke="#fff" stroke-width="2" stroke-linecap="round"/></svg>
+          <button class="toolbar-btn toolbar-btn-danger" id="abortAllBtn" title="Abort all Downloads">
+            <svg width="16" height="16" viewBox="0 0 16 16"><rect x="1" y="1" width="14" height="14" rx="2" fill="#e53935"/><path d="M4.5 4.5l7 7M11.5 4.5l-7 7" stroke="#fff" stroke-width="2" stroke-linecap="round"/></svg>
          </button>
          <span class="toolbar-sep"></span>
-          <button class="toolbar-btn" id="moveTopBtn" title="Ganz nach oben" aria-label="Ganz nach oben">
+          <button class="toolbar-btn" id="moveTopBtn" title="Move to the top">
            <svg width="16" height="16" viewBox="0 0 16 16"><rect x="4" y="1" width="8" height="2" rx="0.5" fill="#4caf50"/><path d="M8 5l-4 5h8z" fill="#4caf50"/><path d="M8 9l-4 5h8z" fill="#4caf50"/></svg>
          </button>
-          <button class="toolbar-btn" id="moveUpBtn" title="Nach oben" aria-label="Nach oben">
+          <button class="toolbar-btn" id="moveUpBtn" title="Move up">
            <svg width="16" height="16" viewBox="0 0 16 16"><path d="M8 2l-5 6h10z" fill="#4caf50"/><rect x="6" y="8" width="4" height="6" rx="0.5" fill="#4caf50"/></svg>
          </button>
-          <button class="toolbar-btn" id="moveDownBtn" title="Nach unten" aria-label="Nach unten">
+          <button class="toolbar-btn" id="moveDownBtn" title="Move down">
            <svg width="16" height="16" viewBox="0 0 16 16"><rect x="6" y="2" width="4" height="6" rx="0.5" fill="#4caf50"/><path d="M8 14l-5-6h10z" fill="#4caf50"/></svg>
          </button>
-          <button class="toolbar-btn" id="moveBottomBtn" title="Ganz nach unten" aria-label="Ganz nach unten">
+          <button class="toolbar-btn" id="moveBottomBtn" title="Move to the bottom">
            <svg width="16" height="16" viewBox="0 0 16 16"><path d="M8 7l-4-5h8z" fill="#4caf50"/><path d="M8 11l-4-5h8z" fill="#4caf50"/><rect x="4" y="13" width="8" height="2" rx="0.5" fill="#4caf50"/></svg>
          </button>
        </div>
@ -136,14 +136,14 @@
          <table class="queue-table" id="queueTable">
            <thead>
              <tr>
-                <th class="col-filename sortable" data-col="filename" data-sort="filename">Dateiname<span class="col-resizer"></span></th>
-                <th class="col-size sortable" data-col="size" data-sort="size">Hochgeladen / Größe<span class="col-resizer"></span></th>
-                <th class="col-host sortable" data-col="host" data-sort="host">Hoster<span class="col-resizer"></span></th>
+                <th class="col-filename sortable" data-col="filename" data-sort="filename">Filename<span class="col-resizer"></span></th>
+                <th class="col-size sortable" data-col="size" data-sort="size">Uploaded / Size<span class="col-resizer"></span></th>
+                <th class="col-host sortable" data-col="host" data-sort="host">Host<span class="col-resizer"></span></th>
                <th class="col-status sortable" data-col="status" data-sort="status">Status<span class="col-resizer"></span></th>
                <th class="col-elapsed" data-col="elapsed">Zeit<span class="col-resizer"></span></th>
                <th class="col-remaining" data-col="remaining">Rest<span class="col-resizer"></span></th>
-                <th class="col-speed sortable" data-col="speed" data-sort="speed">Geschwindigkeit<span class="col-resizer"></span></th>
-                <th class="col-progress sortable" data-col="progress" data-sort="progress">Fortschritt</th>
+                <th class="col-speed sortable" data-col="speed" data-sort="speed">Speed<span class="col-resizer"></span></th>
+                <th class="col-progress sortable" data-col="progress" data-sort="progress">Progress</th>
              </tr>
            </thead>
            <tbody id="queueBody"></tbody>
@ -168,8 +168,8 @@
        <div class="recent-files-panel" id="recentFilesPanel">
          <div class="recent-files-header">
            <div class="recent-tabs">
-              <button class="recent-tab active" data-panel="filesTab">Dateien</button>
-              <button class="recent-tab" data-panel="statsTab">Statistik</button>
+              <button class="recent-tab active" data-panel="filesTab">Files</button>
+              <button class="recent-tab" data-panel="statsTab">Stats</button>
            </div>
            <span class="recent-files-hint" id="recentFilesHint">Zuletzt erzeugte Upload-Links</span>
            <button class="btn btn-xs btn-secondary" id="exportRecentFilesBtn" title="Alle Zeilen als Datei exportieren (Zeit, Hoster, Link, Dateiname)">Exportieren</button>
@ -181,8 +181,8 @@
                <thead id="recentFilesHead">
                  <tr>
                    <th class="col-date sortable" data-recent-sort="date">Datum<span class="sort-indicator">▼</span></th>
-                    <th class="col-filename sortable" data-recent-sort="filename">Dateiname<span class="sort-indicator">↕</span></th>
-                    <th class="col-host sortable" data-recent-sort="host">Hoster<span class="sort-indicator">↕</span></th>
+                    <th class="col-filename sortable" data-recent-sort="filename">Filename<span class="sort-indicator">↕</span></th>
+                    <th class="col-host sortable" data-recent-sort="host">Host<span class="sort-indicator">↕</span></th>
                    <th class="col-link sortable" data-recent-sort="link">Link<span class="sort-indicator">↕</span></th>
                  </tr>
                </thead>
@ -193,24 +193,24 @@
          <div class="recent-tab-body" id="statsTab">
            <div class="stats-grid">
              <div class="stats-col">
-                <h4>Dateien in der Warteschlange</h4>
-                <div class="stats-row"><span>Gesamt:</span><span id="statQueueTotal">0</span></div>
-                <div class="stats-row"><span>Fertig:</span><span id="statQueueDone">0</span></div>
-                <div class="stats-row"><span>Verbleibend:</span><span id="statQueueRemaining">0</span></div>
-                <div class="stats-row"><span>Läuft:</span><span id="statQueueInProgress">0</span></div>
-                <div class="stats-row"><span>Fehler:</span><span id="statQueueError">0</span></div>
+                <h4>Files in queue (count)</h4>
+                <div class="stats-row"><span>total:</span><span id="statQueueTotal">0</span></div>
+                <div class="stats-row"><span>done:</span><span id="statQueueDone">0</span></div>
+                <div class="stats-row"><span>remaining:</span><span id="statQueueRemaining">0</span></div>
+                <div class="stats-row"><span>in progress:</span><span id="statQueueInProgress">0</span></div>
+                <div class="stats-row"><span>error:</span><span id="statQueueError">0</span></div>
              </div>
              <div class="stats-col">
-                <h4>Dateigröße in der Warteschlange</h4>
-                <div class="stats-row"><span>Gesamt:</span><span id="statSizeTotal">0 B</span></div>
-                <div class="stats-row"><span>Verbleibend:</span><span id="statSizeRemaining">0 B</span></div>
+                <h4>File size in queue</h4>
+                <div class="stats-row"><span>total:</span><span id="statSizeTotal">0 B</span></div>
+                <div class="stats-row"><span>remaining:</span><span id="statSizeRemaining">0 B</span></div>
              </div>
              <div class="stats-col">
-                <h4>Sitzung</h4>
-                <div class="stats-row"><span>Upload-Geschwindigkeit:</span><span id="statSpeed">0 B/s</span></div>
-                <div class="stats-row"><span>Restzeit:</span><span id="statEta">--:--</span></div>
-                <div class="stats-row"><span>Laufzeit:</span><span id="statRunTime">00:00:00</span></div>
-                <div class="stats-row"><span>In diesem Lauf hochgeladen:</span><span id="statSessionBytes">0 B</span></div>
+                <h4>Session</h4>
+                <div class="stats-row"><span>Upload speed:</span><span id="statSpeed">0 B/s</span></div>
+                <div class="stats-row"><span>Remaining time:</span><span id="statEta">--:--</span></div>
+                <div class="stats-row"><span>Run time:</span><span id="statRunTime">00:00:00</span></div>
+                <div class="stats-row"><span>Uploaded (this run):</span><span id="statSessionBytes">0 B</span></div>
              </div>
            </div>
          </div>
@ -219,7 +219,7 @@
    </div>
  </div>

-  <div id="accounts-view" class="view" role="tabpanel" aria-labelledby="accounts-tab">
+  <div id="accounts-view" class="view">
    <div class="accounts-container">
      <div class="accounts-header">
        <div>
@ -232,7 +232,7 @@
            <input type="checkbox" id="autoHealthCheckToggle" checked>
            <span>Auto-Check vor Upload</span>
          </label>
-          <button class="btn btn-primary" id="addAccountBtn">Account hinzufügen</button>
+          <button class="btn btn-primary" id="addAccountBtn">+ Account hinzufügen</button>
        </div>
      </div>
      <div class="health-check-results account-health-results" id="healthCheckResults"></div>
@ -244,7 +244,7 @@
  </div>

  <div class="modal-overlay" id="accountModal" style="display:none">
-    <div class="modal-card" role="dialog" aria-modal="true" aria-labelledby="accountModalTitle" aria-describedby="accountModalSubtitle">
+    <div class="modal-card">
      <div class="modal-header">
        <div>
          <h3 id="accountModalTitle">Account hinzufügen</h3>
@ -254,19 +254,19 @@
      </div>
      <div class="modal-body">
        <div class="settings-row" id="accountHosterRow">
-          <label for="accountHosterSelect">Hoster</label>
-          <select class="key-input" id="accountHosterSelect" name="hoster" autocomplete="off" style="max-width:300px"></select>
+          <label>Hoster</label>
+          <select class="key-input" id="accountHosterSelect" style="max-width:300px"></select>
        </div>
        <div class="settings-row">
-          <label for="accField_label">Label (optional)</label>
-          <input type="text" class="key-input" id="accField_label" name="accountLabel" autocomplete="off" placeholder="z. B. Hauptaccount, Premium, Kunde XY" maxlength="60">
+          <label>Label (optional)</label>
+          <input type="text" class="key-input" id="accField_label" placeholder="z.B. Hauptaccount, Premium, Kunde XY" maxlength="60">
        </div>
        <div id="accountCredsFields"></div>
-        <div class="account-modal-status" id="accountModalStatus" role="status" aria-live="polite"></div>
+        <div class="account-modal-status" id="accountModalStatus"></div>
      </div>
      <div class="modal-footer">
        <button class="btn btn-secondary" id="cancelAccountModalBtn">Abbrechen</button>
-        <button class="btn btn-primary" id="saveAccountBtn">Prüfen und anlegen</button>
+        <button class="btn btn-primary" id="saveAccountBtn">Anlegen &amp; prüfen</button>
      </div>
    </div>
  </div>
@ -303,7 +303,7 @@
    </div>
  </div>

-  <div id="settings-view" class="view" role="tabpanel" aria-labelledby="settings-tab">
+  <div id="settings-view" class="view">
    <div class="settings-container">
      <h2>Upload-Einstellungen</h2>
      <p class="settings-hint">Hoster-Einstellungen erscheinen erst, sobald ein Account hinterlegt ist. Änderungen werden automatisch gespeichert.</p>
@ -315,7 +315,7 @@
    </div>
  </div>

-  <div id="history-view" class="view" role="tabpanel" aria-labelledby="history-tab">
+  <div id="history-view" class="view">
    <div class="history-container">
      <div class="history-header">
        <h2>Upload-Verlauf</h2>
@ -368,17 +368,17 @@
    <span class="sb-separator">|</span>
    <span class="sb-eta" id="sbEta">ETA --:--</span>
    <span class="sb-separator">|</span>
-    <span class="sb-connections" id="sbConnections">Verbindungen 0</span>
+    <span class="sb-connections" id="sbConnections">Aktive Verbindungen 0</span>
    <span class="sb-separator">|</span>
    <span class="sb-queue-count" id="sbQueueCount">Gesamt 0</span>
    <span class="sb-separator">|</span>
-    <span class="sb-remaining-count" id="sbRemainingCount">Verbleibend 0</span>
+    <span class="sb-remaining-count" id="sbRemainingCount">Remaining 0</span>
    <span class="sb-separator">|</span>
-    <span class="sb-progress-count" id="sbInProgressCount">Läuft 0</span>
+    <span class="sb-progress-count" id="sbInProgressCount">In Progress 0</span>
    <span class="sb-separator">|</span>
-    <span class="sb-done-count" id="sbDoneCount">Fertig 0</span>
+    <span class="sb-done-count" id="sbDoneCount">Done 0</span>
    <span class="sb-separator">|</span>
-    <span class="sb-error-count" id="sbErrorCount">Fehler 0</span>
+    <span class="sb-error-count" id="sbErrorCount">Error 0</span>
  </div>

  <div class="copy-toast" id="copyToast"></div>
@ -421,7 +421,6 @@
  <script src="../lib/throttled-cache.js"></script>
  <script src="../lib/coalesced-set.js"></script>
  <script src="../lib/throttle-timer.js"></script>
-  <script src="account-submit.js"></script>
  <script src="app.js"></script>
 </body>
 </html>
--- a/renderer/styles.css
+++ b/renderer/styles.css
@ -1,5 +1,4 @@
 :root {
-  color-scheme: dark;
  --bg-primary: #16181c;
  --bg-secondary: #20242b;
  --bg-card: #262b33;
@ -9,7 +8,7 @@
  --border-hover: rgba(255, 255, 255, 0.18);
  --text: #edf1f7;
  --text-muted: #9ea7b3;
-  --text-dim: #8490a0;
+  --text-dim: #727b88;
  --accent: #3ea7ff;
  --accent-end: #65d8ff;
  --success: #43c788;
@ -217,7 +216,7 @@ body {
  text-transform: uppercase;
  cursor: pointer;
  border-bottom: 2px solid transparent;
-  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
+  transition: all 0.2s;
 }
 .tab:hover { color: var(--text); }
 .tab.active { color: var(--text); border-bottom-color: var(--accent); background: rgba(255, 255, 255, 0.03); }
@ -257,7 +256,7 @@ body {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
-  transition: color 0.2s, background-color 0.2s, border-color 0.2s, filter 0.2s, transform 0.2s;
+  transition: all 0.2s;
 }
 .btn-xs { padding: 4px 10px; font-size: 11px; border-radius: 4px; }
 .btn-sm { padding: 5px 12px; font-size: 12px; border-radius: 5px; }
@ -320,7 +319,7 @@ body {
  border: 1px dashed rgba(126, 220, 255, 0.28);
  border-radius: 18px;
  cursor: pointer;
-  transition: color 0.3s, background-color 0.3s, border-color 0.3s;
+  transition: all 0.3s;
  color: var(--text-muted);
  min-height: 200px;
  background:
@ -360,7 +359,7 @@ body {
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
-  transition: color 0.15s, background-color 0.15s, border-color 0.15s, transform 0.15s;
+  transition: all 0.15s;
 }
 .toolbar-btn:hover {
  background: rgba(255,255,255,0.1);
@ -572,7 +571,7 @@ body.col-resizing, body.col-resizing * { cursor: col-resize !important; user-sel
  border-bottom: none;
  color: var(--text-muted);
  cursor: pointer;
-  transition: color 0.15s, background-color 0.15s, border-color 0.15s;
+  transition: all 0.15s;
 }
 .recent-tab:first-child { border-radius: 4px 0 0 0; }
 .recent-tab:last-child { border-radius: 0 4px 0 0; }
@ -658,7 +657,6 @@ body.col-resizing, body.col-resizing * { cursor: col-resize !important; user-sel
 .recent-file-row {
  cursor: pointer;
  transition: background 0.15s;
-  height: 28px;
 }
 .recent-file-row:hover {
  background: rgba(255, 255, 255, 0.03);
@ -678,7 +676,6 @@ body.col-resizing, body.col-resizing * { cursor: col-resize !important; user-sel
  background: rgba(5, 7, 16, 0.72);
  z-index: 2500;
  padding: 24px;
-  overscroll-behavior: contain;
 }
 .modal-card {
  width: min(560px, 100%);
@ -715,8 +712,6 @@ body.col-resizing, body.col-resizing * { cursor: col-resize !important; user-sel
  padding: 14px 16px 10px;
  overflow: auto;
 }
-.modal-body .settings-row { gap: 10px; }
-.modal-body .key-input { min-height: 36px; }
 .modal-actions-inline {
  display: flex;
  gap: 8px;
@ -1194,29 +1189,12 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
 }

 .accounts-empty {
-  width: min(520px, 100%);
-  margin: clamp(56px, 12vh, 120px) auto 0;
-  padding: 32px;
-  border: 1px solid var(--border);
-  border-radius: 16px;
-  background: linear-gradient(180deg, rgba(62, 167, 255, 0.06), rgba(255, 255, 255, 0.025));
-  box-shadow: var(--panel-shadow);
  text-align: center;
+  padding: 48px 16px;
+  color: var(--text-dim);
 }
-.accounts-empty-icon {
-  display: grid;
-  place-items: center;
-  width: 48px;
-  height: 48px;
-  margin: 0 auto 14px;
-  border-radius: 14px;
-  background: rgba(62, 167, 255, 0.14);
-  color: var(--accent-end);
-  font-size: 30px;
-  font-weight: 300;
-}
-.accounts-empty h3 { font-size: 17px; margin-bottom: 6px; }
-.accounts-empty p { max-width: 390px; margin: 0 auto 18px; color: var(--text-muted); font-size: 13px; line-height: 1.55; }
+.accounts-empty p { font-size: 14px; margin-bottom: 4px; }
+.accounts-empty .hint { font-size: 12px; }

 /* History View */
 .history-container { padding: 16px; overflow: auto; flex: 1; background: linear-gradient(180deg, rgba(255,255,255,0.015), transparent 24%); }
@ -1253,11 +1231,6 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
 .results-table th.active, .history-table th.active { color: var(--text); }
 .sort-indicator { margin-left: 4px; font-size: 10px; }

-.history-table { table-layout: fixed; }
-.history-table .col-date { width: 16%; }
-.history-table .col-filename { width: 34%; }
-.history-table .col-host { width: 12%; }
-.history-table .col-link { width: 38%; }
 .history-row {
  cursor: pointer;
  transition: background 0.15s;
@ -1313,7 +1286,7 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
-  transition: opacity 0.3s, transform 0.3s;
+  transition: all 0.3s;
  z-index: 2000;
 }
 .copy-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@ -1360,29 +1333,3 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
 ::-webkit-scrollbar-track { background: transparent; }
 ::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 4px; }
 ::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); }
-
-:where(button, input, select, textarea, [tabindex]):focus-visible {
-  outline: 2px solid var(--accent-end);
-  outline-offset: 2px;
-}
-
-.key-input:focus-visible,
-.hs-input:focus-visible {
-  border-color: var(--accent);
-  outline: 2px solid rgba(101, 216, 255, 0.45);
-  outline-offset: 1px;
-}
-
-.menu-spinner input[type="text"]:focus-visible {
-  outline: 2px solid var(--accent-end);
-  outline-offset: -2px;
-}
-
-@media (prefers-reduced-motion: reduce) {
-  *, *::before, *::after {
-    scroll-behavior: auto !important;
-    transition-duration: 0.01ms !important;
-    animation-duration: 0.01ms !important;
-    animation-iteration-count: 1 !important;
-  }
-}
--- a/scripts/release_gitea.mjs
+++ b/scripts/release_gitea.mjs
@ -1,61 +1,27 @@
 #!/usr/bin/env node
 import { execSync } from 'child_process';
 import { createHash } from 'crypto';
-import { writeFileSync, statSync, createReadStream, existsSync } from 'fs';
+import { readFileSync, writeFileSync, statSync, createReadStream, existsSync } from 'fs';
 import { resolve, basename } from 'path';
-import { pathToFileURL } from 'url';

 const ROOT = resolve(import.meta.dirname, '..');
+const PKG_PATH = resolve(ROOT, 'package.json');
 const RELEASE_DIR = resolve(ROOT, 'release');
 const PRODUCT_NAME = 'Multi-Hoster-Upload';

 // --- CLI args ---
-export function parseReleaseArgs(args) {
-  const version = Array.isArray(args) ? args[0] : '';
-  if (!/^\d+\.\d+\.\d+$/.test(version || '')) {
-    throw new Error('Usage: node scripts/release_gitea.mjs <version> --transport-tag <vX.Y.Z> [release notes] [--dry-run]');
-  }
+const args = process.argv.slice(2);
+const dryRun = args.includes('--dry-run');
+const version = args.find(a => /^\d+\.\d+\.\d+$/.test(a));
+const notes = args.filter(a => a !== version && a !== '--dry-run').join(' ') || '';

-  const transportTagIndex = args.indexOf('--transport-tag');
-  const transportTag = transportTagIndex >= 0 ? args[transportTagIndex + 1] : '';
-  if (!/^v\d+\.\d+\.\d+$/.test(transportTag)) {
-    throw new Error('--transport-tag must match vX.Y.Z');
-  }
-
-  const excludedIndexes = new Set([0, transportTagIndex, transportTagIndex + 1]);
-  const notes = args.filter((arg, index) => !excludedIndexes.has(index) && arg !== '--dry-run').join(' ');
-  return { version, transportTag, notes, dryRun: args.includes('--dry-run') };
+if (!version) {
+  console.error('Usage: node scripts/release_gitea.mjs <version> [release notes] [--dry-run]');
+  console.error('Example: node scripts/release_gitea.mjs 1.0.1 "Bugfix release"');
+  process.exit(1);
 }

-export function createReleasePlan(options) {
-  const releaseTitle = `${PRODUCT_NAME} v${options.version}`;
-  const setupName = `${PRODUCT_NAME} Setup ${options.version}.exe`;
-  const portableName = `${PRODUCT_NAME} ${options.version}.exe`;
-  return {
-    ...options,
-    tag: options.transportTag,
-    releaseTitle,
-    releaseBody: options.notes || releaseTitle,
-    setupName,
-    portableName,
-    expectedArtifacts: [setupName, portableName, 'latest.yml'],
-    blockmapName: `${setupName}.blockmap`
-  };
-}
-
-export function resolveExistingReleaseId(plan, release) {
-  const existingTitle = typeof release?.name === 'string' ? release.name : '';
-  if (existingTitle !== plan.releaseTitle) {
-    throw new Error(`Refusing recovery for ${plan.tag}: existing release title "${existingTitle}" does not match "${plan.releaseTitle}"`);
-  }
-  return release.id;
-}
-
-export function renderLatestYml(plan, sha, size, releaseDate = new Date().toISOString()) {
-  return `version: ${plan.version}\nfiles:\n  - url: ${plan.setupName}\n    sha512: ${sha}\n    size: ${size}\npath: ${plan.setupName}\nsha512: ${sha}\nreleaseDate: '${releaseDate}'\n`;
-}
-
-let dryRun = false;
+const tag = `v${version}`;

 // --- Helpers ---
 function run(cmd, opts = {}) {
@ -143,11 +109,8 @@ async function uploadAsset(releaseId, filePath, token) {
 }

 // --- Main ---
-async function main(args = process.argv.slice(2)) {
-  const plan = createReleasePlan(parseReleaseArgs(args));
-  const { version, tag } = plan;
-  dryRun = plan.dryRun;
-  console.log(`\nReleasing ${plan.releaseTitle} via ${tag}${dryRun ? ' [DRY RUN]' : ''}\n`);
+async function main() {
+  console.log(`\nReleasing ${PRODUCT_NAME} ${tag}${dryRun ? ' [DRY RUN]' : ''}\n`);

  // 1. Resolve remote
  const remote = resolveGiteaRemote();
@ -175,19 +138,18 @@ async function main(args = process.argv.slice(2)) {

  if (!recoveryMode) {
    // 4. Update package.json version
-    run(`npm version ${version} --no-git-tag-version --allow-same-version`);
-    console.log(`Updated package.json and package-lock.json -> ${version}`);
+    const pkg = JSON.parse(readFileSync(PKG_PATH, 'utf-8'));
+    pkg.version = version;
+    if (!dryRun) writeFileSync(PKG_PATH, JSON.stringify(pkg, null, 2) + '\n', 'utf-8');
+    console.log(`Updated package.json -> ${version}`);

    // 5. Build
    console.log('\nBuilding...');
    run('npm run release:win', { stdio: 'inherit' });

    // 6. Git commit + tag + push
-    const versionStatus = run('git status --porcelain -- package.json package-lock.json', { allowDry: true });
-    if (versionStatus) {
-      run('git add package.json package-lock.json');
+    run('git add package.json');
    run(`git commit -m "release: ${tag}"`);
-    }
    run(`git tag ${tag}`);
    run(`git push ${remote.name} HEAD`);
    run(`git push ${remote.name} ${tag}`);
@ -195,7 +157,8 @@ async function main(args = process.argv.slice(2)) {

  // 6b. Regenerate latest.yml to ensure correct SHA-512
  {
-    const setupPath = resolve(RELEASE_DIR, plan.setupName);
+    const setupName = `${PRODUCT_NAME} Setup ${version}.exe`;
+    const setupPath = resolve(RELEASE_DIR, setupName);
    if (existsSync(setupPath)) {
      const sha = await new Promise((res, rej) => {
        const h = createHash('sha512');
@ -205,14 +168,18 @@ async function main(args = process.argv.slice(2)) {
        s.on('error', rej);
      });
      const size = statSync(setupPath).size;
-      const yml = renderLatestYml(plan, sha, size);
+      const yml = `version: ${version}\nfiles:\n  - url: ${setupName}\n    sha512: ${sha}\n    size: ${size}\npath: ${setupName}\nsha512: ${sha}\nreleaseDate: '${new Date().toISOString()}'\n`;
      writeFileSync(resolve(RELEASE_DIR, 'latest.yml'), yml, 'utf-8');
      console.log('Regenerated latest.yml with correct SHA-512');
    }
  }

  // 7. Verify artifacts
-  const expectedArtifacts = plan.expectedArtifacts;
+  const expectedArtifacts = [
+    `${PRODUCT_NAME} Setup ${version}.exe`,
+    `${PRODUCT_NAME} ${version}.exe`,
+    'latest.yml'
+  ];

  for (const name of expectedArtifacts) {
    const p = resolve(RELEASE_DIR, name);
@ -223,7 +190,7 @@ async function main(args = process.argv.slice(2)) {
  }

  // Also check for blockmap
-  const blockmapName = plan.blockmapName;
+  const blockmapName = `${PRODUCT_NAME} Setup ${version}.exe.blockmap`;
  const hasBlockmap = existsSync(resolve(RELEASE_DIR, blockmapName));

  console.log('\nArtifacts verified.');
@ -236,19 +203,20 @@ async function main(args = process.argv.slice(2)) {
  }

  // 9. Create release
+  const releaseBody = notes || `${PRODUCT_NAME} ${tag}`;
  let releaseId;

  const { status: createStatus, data: createData } = await giteaApi(
    'POST',
    `/api/v1/repos/Administrator/${PRODUCT_NAME}/releases`,
    token,
-    { tag_name: tag, name: plan.releaseTitle, body: plan.releaseBody }
+    { tag_name: tag, name: `${PRODUCT_NAME} ${tag}`, body: releaseBody }
  );

  if (createStatus === 409 || createStatus === 422) {
    // Release already exists, find it
    const { data: releases } = await giteaApi('GET', `/api/v1/repos/Administrator/${PRODUCT_NAME}/releases/tags/${tag}`, token);
-    releaseId = resolveExistingReleaseId(plan, releases);
+    releaseId = releases.id;
    console.log(`Release already exists (id: ${releaseId})`);
  } else {
    releaseId = createData.id;
@ -266,10 +234,7 @@ async function main(args = process.argv.slice(2)) {
  console.log(`\nDone! Release: ${process.env.GITEA_BASE_URL || 'https://git.24-music.de'}/Administrator/${PRODUCT_NAME}/releases/tag/${tag}\n`);
 }

-const entryPoint = process.argv[1] ? pathToFileURL(resolve(process.argv[1])).href : '';
-if (entryPoint === import.meta.url) {
-  main().catch(err => {
+main().catch(err => {
  console.error('\nRelease failed:', err.message);
  process.exit(1);
-  });
-}
+});
--- a/tasks/lessons.md
+++ b/tasks/lessons.md
@ -1,86 +1,5 @@
 # Lessons

-## 2026-08-07 — Einen kleinen Release nicht durch redundante Gates aufblasen
-**Symptom:** Die angefragten Änderungen waren implementiert und getestet, trotzdem lief die Arbeit durch wiederholte Status-, Review- und Harness-Schleifen übermäßig lange weiter.
-**Root cause:** Pflichtsicherheit, bereits belegte Wiederholungsprüfungen und optionale Zusatzdiagnostik wurden nicht hart getrennt. Technische Harnessfehler führten zu weiteren Schleifen, obwohl Produktcode und Kernlauf bereits grün waren.
-**Regel:** Nach grüner Implementierung genau eine risikogerechte Pflichtkette fahren: Tests, Build, Secret-Gate, realer Lauf, Positivliste, Veröffentlichung, Redownload. Bereits belegte Gates nicht wiederholen und optionale Diagnose sofort streichen, sobald sie die Auslieferung verzögert.
-**Wie anwenden:** Vor jedem zusätzlichen Check benennen, welche noch offene Release-Invariante er beweist. Beweist er keine neue Pflichtinvariante, wird er nicht ausgeführt.
-
-## 2026-06-21 — Das eigene Instrument lügt nicht, aber sein Log-Code kann buggen (`queue=undefined`)
-**Symptom:** Drei Builds lang jagte ich Read-Bursts (highWaterMark, threadpool), während der WAHRE Treiber
-eine 38,5-MB-electron-config.json war, die 137×/73s geklont/geparst/serialisiert wurde (~47% Main-Thread).
-Erst das in v3.3.98 eingebaute `config-load/config-serialize`-Log machte es sichtbar — aber mein eigenes
-Log-Feld `queue=` las `.length` auf dem pendingQueue-OBJEKT (immer undefined) und hätte mich fast in die
-falsche Richtung (pendingQueue statt history) geschickt.
-**Root cause:** (1) Ich hatte die config-Persistenz als „instrumentieren, nicht fixen" zurückgestellt (richtig
-für die unsichere Migration), aber den Lag-Treiber dort nicht früh genug vermutet. (2) Instrument-Felder selbst
-müssen verifiziert werden: `(obj || []).length` auf einem Objekt = undefined, still falsch.
-**Regel:** Wenn der User „es laggt unverändert" sagt obwohl die letzte Messung gut aussah, ist der gemessene
-Pfad NICHT der Hot-Path — sofort BREITER messen (jeden IPC-Handler, jede periodische Main-Op, Main-Thread-
-Longtask-Monitor), nicht den schon-gemessenen Pfad weiter optimieren. Und Instrument-Ausgaben gegen ein
-bekanntes Beispiel prüfen (zeigt `queue=` je eine echte Zahl?).
-**Wie anwenden:** Bei „Symptom unverändert trotz Fix": Hypothese fallen lassen, Coverage verbreitern. Log-Felder
-beim Schreiben mit einem realen Wert gegenchecken, nie blind `(x||[]).length` auf unklar getypten Feldern.
-
-## 2026-06-21 — „Brot finden, nicht Krümel": die EINE Änderung, die alle Kosten killt, schlägt drei sichere Teilfixes
-**Symptom:** Fix-Design bot loadShallow (Klon vermeiden) + cache-repopulate + resolution-cache. Adversary zeigte:
-loadShallow killt nur den Klon (~10s von 34s), die 38 Serializes (8,4s) + 38 Post-Write-Reparses (15,2s) bleiben,
-weil Writes den Cache nullen → loadShallow allein = Krümel.
-**Root cause:** Alle drei Kosten (parse+clone+serialize) entstehen daraus, dass history IM Hot-Config liegt.
-Nur history RAUS aus der immer-geladenen Datei (eigene electron-history.json) killt alle drei gleichzeitig.
-cache-repopulate-Gate feuerte nie (toter Code); resolution-cache hätte stale-Pools → Failover-Regression
-(rotation/byse) riskiert = die EINE Sache die Uploads STILL korrumpiert, schlimmer als Lag.
-**Regel:** Wenn der User „komplett wegmachen" fordert und mehrere sichere Teilfixes vs. ein riskanterer
-Komplettfix zur Wahl stehen: den Komplettfix nehmen, aber RICHTIG absichern (hier: fsync+verify-before-strip,
-permanenter .pre-history-split.bak, Migration packaged-only + per-Init nicht in load(), Crash-Window-Fallback,
-Test gegen die ECHTE 194MB-Fixture). Teilfixes die den Treiber nur anknabbern NICHT bündeln (verwässert Messung
-+ Risiko). Einen Fix der etwas STILL korrumpieren könnte (stale Account-Pools) NIE für Performance einbauen.
-**Wie anwenden:** Bei mehreren Fix-Optionen fragen: „welche EINE Änderung entfernt die gemeinsame Wurzel ALLER
-Kostenpfade?" — die nehmen und maximal absichern, statt N sichere Teilfixes die je nur einen Pfad treffen.
-
-## 2026-06-21 — Ein-Variablen-Disziplin: nicht zwei Fixes bündeln, wenn einer den anderen maskiert
-**Symptom:** Nach dem tp=8-Win wollte ich in EINEM Build A (1MB highWaterMark, Read-Burst) + B (Renderer
-chunked rAF Batch-Drain, der 243ms-Longtask) + C-Instrument shippen.
-**Root cause / Korrektur (Advisor):** Der Renderer war 14/15 Fenstern gesund; der EINE 243ms-Longtask (W14)
-ist laut beiden Agenten DOWNSTREAM des Main-Thread-Read-Bursts (geflutetes IPC). Fix A reduziert diese
-Stalls → der Renderer-Longtask verschwindet wahrscheinlich OHNE B. B mitzuliefern (a) verwässert die nächste
-Messung (war die Besserung A oder B?) und (b) fasst den Progress-Hot-Path an, der hier schon gebissen hat
-(formatDateTime-Burst, ghost-fix).
-**Regel:** Wenn Fix A einen vermuteten Symptom-Treiber X reduziert und Fix B genau X behandeln würde —
-NUR A shippen, messen, B nur nachziehen wenn X überlebt. Sonst kann das nächste Log nicht sauber attribuieren.
-Bei gekoppelten Symptomen ist die Reihenfolge (Upstream-Fix zuerst, dann messen) wichtiger als „alles auf
-einmal".
-**Wie anwenden:** Vor dem Bündeln fragen: „Maskiert Fix A die Wirkung, die Fix B beheben soll?" Wenn ja →
-entkoppeln, A zuerst, eine Variable pro Build.
-
-## 2026-06-21 — Nicht aus EINEM konfundierten Sample eine Ursache behaupten
-**Symptom:** Ich wollte dem User sagen „1-Sekunden-Persist-Freeze gefunden" auf Basis von W13 (max=1021ms,
-heap→142MB).
-**Root cause / Korrektur (Advisor):** W13 ist EIN Sample und konfundiert (hat gleichzeitig FSReqCallback=66)
-und das EINZIGE Heap-Spike-Fenster. Die anderen isolierten Maxes (W4 415ms/heap41, W10 852ms/heap18) haben
-NIEDRIGEN Heap → sind KEIN 140MB-structuredClone+stringify → eine andere Ursache (account-failed sync load()
-nahe Connection-Churn). Eine Behauptung aus einem konfundierten Punkt hätte den falschen Fix priorisiert.
-**Regel:** Bei isolierten Spitzen erst die Co-Signale (heap, FSReq, gc, Nachbarfenster) gegenchecken, ob sie
-EINE Familie sind. Wenn die Magnitude-Signatur (hier: Heap-Spike) nicht bei allen passt → es sind mehrere
-Ursachen. „Instrumentieren + bestätigen", nicht „gefunden", solange nur ein konfundierter Punkt existiert.
-**Wie anwenden:** Vor „Ursache X gefunden": gibt es ≥2 unkonfundierte Samples mit derselben Signatur? Wenn
-nein → als Hypothese formulieren und messen, nicht als Befund verkaufen.
-
-## 2026-06-21 — Histogram-Korrelation beweist KEINE Kausalrichtung; rss-Mathe als Sanity-Check
-**Symptom:** ELD-Spikes korrelierten exakt mit hohem `FSReqCallback` (File-Reads in flight) → ich wollte
-sofort ein Read-Concurrency-Semaphore über 5 Dateien bauen.
-**Root cause / Korrektur (Advisor):** (1) Korrelation ≠ Kausalität: hohe in-flight-Reads können auch SYMPTOM
-sein — ein aus ANDEREM Grund blockierter Loop drained die Read-Completions nicht, also stapeln sie sich im
-Snapshot. (2) rss-Mathe widerlegte meine „Read-Buffer ballonen den Speicher"-These: 70 Streams × 256KB ≈
-18MB, aber rss schwang ~300MB → das ist Heap-/Objekt-Churn (GC), nicht die Read-Buffer.
-**Regel:** Bevor ich auf Basis einer Histogramm-Korrelation einen Multi-File-Refactor baue: (a) Kausalrichtung
-mit einem BILLIGEN reversiblen 1-Zeilen-Hebel testen (hier UV_THREADPOOL_SIZE 64→8), (b) die Größenordnung
-gegenrechnen (passt die vermutete Quelle zahlenmäßig zur beobachteten Wirkung?), (c) den fehlenden Co-Faktor
-(GC) erst MESSEN, bevor ich ihn aus- oder einschließe. Ein Build kann gleichzeitig Kandidaten-Fix UND
-Diskriminator sein.
-**Wie anwenden:** Bei „X korreliert mit Y, also fixe X": erst fragen „könnte Y → X statt X → Y?" und „passt
-die Magnitude?". Wenn nein/unklar → erst der billige reversible Knopf + Messung, dann der teure Refactor.
-
 ## 2026-04-21 — DOM-Doppelrender bei Bulk-State-Changes
 **Symptom:** User klickt auf "Erneut versuchen" mit 500+ Jobs → App hängt sekundenlang.
 **Root cause:** `retrySelectedJobs()` ruft `renderQueueTable + updateQueueActionButtons + updateStatusBar` auf, `startSelectedUpload()` ruft direkt danach genau dieselben Funktionen nochmal auf.
@ -240,16 +159,3 @@ die Magnitude?". Wenn nein/unklar → erst der billige reversible Knopf + Messun
 **Fix:** `fs.openSync`/`readSync`/`closeSync` → `fs.promises.open` + `await fh.read` + `await fh.close()`. Byte-Äquivalenz mit Hash-Vergleich über alle Chunk-Grenzfälle verifiziert (volle/partielle/multi-Chunk/1-Byte) BEVOR geshipped — ein Chunk-Read-Bug = korrupter Upload, deshalb Pflicht-Verifikation, nicht „sieht richtig aus". Separater Fix: rotation-retry + suspect-alternate progressCb in upload-manager.js feuerten `_emitProgress` (sync `emit` + frischer Object-Spread) bei JEDEM Stream-Chunk (hunderte/s/Job) — der 250-ms-`lastEmitTime`-Gate des Primary-Path fehlte. Gate gespiegelt (activeEntry-Mutation bleibt ungated für Stats/Speed-Monitor, nur der emit ist gegated).
 **Regel:** Wenn der User eine konkrete Mechanik vermutet („er updatet alle Zeilen gebündelt"), die Mechanik MESSEN bevor man sie fixt — nicht der Plausibilität folgen. Die Messung kann die Hypothese widerlegen UND den echten Verursacher woanders aufdecken (hier: nicht Renderer-DOM, sondern sync-fs im Upload-Datapfad). „Laggy bei moderater CPU" (40%/8 Kerne = ein Kern bei 100%) zeigt auf Main-Thread-Sättigung/sync-Blocking, NICHT auf DOM-Amplifikation. Bei Daten-Pfad-Fixes (Upload-Bytes) immer Byte-Äquivalenz beweisen, nicht nur Tests grün.
 **Discriminator nicht vergessen:** Mit der echten User-Config (parallelCount 2×5 Hoster ≈10 gleichzeitig) sind „100 gleichzeitig" nur erreichbar wenn die Parallel-Counts hochgedreht wurden — sonst sind „100" die QUEUE-Größe, nicht concurrent. Nach dem Ship dem User die Unterscheidungsfrage stellen (Lag clouddrop-spezifisch? Parallel-Counts erhöht?), statt blind Sieg zu erklären — bei echter High-Concurrency bräuchte es ein Concurrency-Cap / Worker-Prozess, keinen Mikro-Fix.
-
-## 2026-06-21 — Zwei lebende Hypothesen mit GEGENSÄTZLICHEN Fixes: instrumentieren statt per Elimination refactoren (v3.3.91)
-**Kontext:** Discriminator beantwortet — Lag ist TRUE high-concurrency (User fährt 50+ gleichzeitig, Counts hochgedreht), nicht clouddrop. Ich wollte einen Mess-Workflow starten, um „inherent TLS → Worker" zu belegen.
-**Die Falle (Advisor hat geblockt):** Der Workflow hätte die JS-Kosten (schon weitgehend als billig gemessen) nur RE-bestätigt und dann „TLS → Worker" per ELIMINATION geschlossen — derselbe Renderer-Rate-Fehler eine Ebene höher. Den credential-tragenden Upload-Core (throttle/rotation/abort/progress) auf Eliminations-Schluss umzubauen ist genau „measure-before-build" verletzt. ZWEI Hypothesen leben und brauchen GEGENSÄTZLICHE Fixes: (A) Main-Thread CPU-blockiert (TLS/crypto/sync) → Event-Loop stallt → Cap/Worker helfen; (B) Main-Thread fein aber IO-STARVED (libuv-Threadpool/Sockets) → Loop bleibt responsiv, Uploads stauen nur → Worker sind VERSCHWENDET, Config fixt es. Ich konnte im Sandbox die echte 50-fach-TLS-Last nicht messen → also hätte JEDER Sandbox-Bench die falsche Antwort per Elimination geliefert.
-**Regel:** Wenn zwei Hypothesen gegensätzliche, teure/schwer-reversible Fixes implizieren UND du die entscheidende Größe im Sandbox nicht messen kannst — baue das MESSINSTRUMENT in die echte App, nicht den Fix. Hier: `perf_hooks.monitorEventLoopDelay` im Main-Prozess, geloggt während Uploads (reine Zahlen → keine Redaktions-Oberfläche). Hohe mean/p99 → CPU-blockiert → Worker gerechtfertigt; niedrige Delay während Uploads stauen → IO-bound → Worker verschwendet, Threadpool/Sockets ist der Hebel. Die Zahl entscheidet die ganze Architektur und blockiert nicht. Den Worker/Child-Process-Refactor NIE off-sandbox per Elimination shippen — erst die echte-App-Zahl + explizites User-OK (hart reversibel, fasst Credentials/Abort/Rotation an).
-**Billigster konkreter Verdächtiger zuerst (reversibel, kein Refactor):** `UV_THREADPOOL_SIZE` Default 4 — alle Uploader speisen undici aus `fs.createReadStream` + DNS getaddrinfo durch denselben Pool → 50 concurrent vs 4 Threads = harter Cliff bei kleiner Connection-Zahl = exakt „ab X connections". Auf 64 (erste Zeile vor require('electron'), libuv liest beim Lazy-Init; Threads on-demand → 64-Max kostet nichts wenn ungenutzt). EINE Env-Var testet die Hypothese mit null Risiko. Windows-Eigenheit dabei gefunden: getaddrinfo wird vom Windows-DNS-Client-Service serialisiert → die DNS-Hälfte des Cliffs ist auf Windows maskiert (fs-Read-Hälfte profitiert trotzdem) — weiterer Grund, warum nur die echte-App-ELD-Zahl zählt, nicht der Sandbox-Bench.
-
-## 2026-06-21 — Das REGIME erfragen bevor man misst/fixt; die Lag-Knoten war eine verschwendete Intl-Format pro Progress-Event (v3.3.93)
-**Kontext:** User liefert echte Daten: „25 connections okay, 50+61 laggt, EVTL wenn die uploadenden Zeilen nicht im Bild sind." Ich wollte sofort meine „non-virtual reflow"-Theorie benchmarken/fixen.
-**Die Falle (Advisor hat geblockt — ZUM DRITTEN MAL die Regime-Falle):** Meine Theorie ruhte auf zwei UNBESTÄTIGTEN Annahmen — (1) Queue <200 (non-virtual), (2) Dateiname-Sort. Beide für einen User mit 50-61 concurrent wahrscheinlich FALSCH. Nach M=10 (falsches Regime) und Renderer-cleared-dann-doch-nicht wäre das der dritte Regime-Fehler gewesen: „synthetischer Bench auf angenommenem Regime". Advisor: ERST die zwei Fakten vom User holen (Queue-Größe? Geklickte Sort-Spalte?) — sie entscheiden, OB die Theorie überhaupt gilt. Antwort: Queue 200-1000 (VIRTUELL → off-screen Zeilen NICHT im DOM → reflow-Theorie tot) + Sort nach Fortschritt/Speed (dynamisch). Das lenkte auf den PER-EVENT-Pfad statt den Render-Pfad.
-**Befund (gemessen, nicht geraten):** `maybeAddSessionFile(job)` berechnete `formatDateTime(new Date())` UNBEDINGT ganz oben — VOR dem `status==='done'`-Check, der für alles andere früh returnt. formatDateTime macht ZWEI Intl-Locale-Formate (toLocaleDateString+toLocaleTimeString) = ~83µs/Call gemessen. Läuft bei JEDEM Progress-Event (onUploadProgressBatch loopt den M-Item-Batch → handleProgress → maybeAddSessionFile) = 10×M/s, und WIRFT es weg für alle nicht-done-Events. Skaliert exakt mit M (250/s @25 → 610/s @61) und feuert in BURSTS: jeder Batch = M Calls back-to-back = synchroner Main-Thread-Block ~2,4ms@25 → ~5ms@61 alle 100ms → sprengt das 16ms-Frame-Budget → Scroll-Stutter. Per-Event, NICHT per-Render → scroll-unabhängig → erklärt „Lag wenn aktive Zeilen off-screen" exakt. DAS war der 25→50-Cliff.
-**Fix:** `const dt = formatDateTime(new Date())` in den `if (!_sessionFileKeys.has(dedupKey))`-Block verschoben → läuft 1× pro echt-neuem fertigen Upload statt pro Progress-Tick. Faithful Blink-Bench am BESTÄTIGTEN Regime (Q=500 virtuell, Progress-Sort, Scrolling, M=25/50/61, OLD vs FIXED): Per-Batch 1,7/3,2/4,1ms (OLD, M-skalierend) → 0/0/0ms (FIXED, flach). Frame-P95 7,3→4,2ms @61. Render/Scroll-Pfad selbst flach ~2,5ms über alle M → KEIN zweiter Knoten dort.
-**Regel:** Bei perzeptuellem Lag IMMER zuerst das REGIME erfragen (Datenmenge, aktive Konfiguration wie Sort-Spalte), bevor man benchmarkt oder fixt — eine plausible Mechanik für das FALSCHE Regime zu messen ist exakt der M=10-Fehler. Wenn der User eine konkrete Beobachtung liefert („wenn off-screen"), ist scroll-UNABHÄNGIG (per-event) vs scroll-abhängig (per-render) der Schlüssel-Diskriminator. Und: verschwendete Arbeit auf dem heißesten Pfad (Intl/new Date/Regex/DOM-Query UNBEDINGT berechnet, dann verworfen) ist ein klassischer M-skalierender Lag-Knoten — `formatDateTime` immer hinter den Guard schieben der das Ergebnis tatsächlich nutzt. Prozess-Grenze beachten: Renderer-Jank ≠ Main-Prozess; das Main-ELD-Log sieht Renderer-Lag NICHT.
--- a/tasks/todo.md
+++ b/tasks/todo.md
@ -1,438 +1,3 @@
-# v3.3.108 — session log filename: 6-digit uniqueness suffix
-
-User: append a generated 6-digit number to the session log filename, e.g.
-26-06-2026-mdu-session-06-02-847581.log. Dropping seconds/pid in v3.3.107 reintroduced same-minute
-collision risk on a fast close/reopen.
- formatSessionStamp(date, rand) appends `-${rand}` when rand is supplied (number or string), else unchanged.
- main.js stamps SESSION_ID = formatSessionStamp(new Date(), String(Math.floor(100000 + Math.random()*900000))).
- stripModeStampFromFileName newSessionRe gains an optional `(?:-\d+)?` so the suffix strips back to the base.
- Tests: stamp-with-rand (string + number), strip-with-suffix. 411 pass.
-Shipped: gitea v3.3.108 (updater latest.yml verified) + GitHub mirror (lib/log-mode.js, main.js, package.json,
-tests/log-mode.test.js only; tag repointed to the sanitized mirror commit, NOT the gitea history commit).
-
---
-
-# v3.3.107 — session log filename template → DD-MM-YYYY-mdu-session-HH-MM
-
-User: change the session log filename from fileuploader-session-YYYY-MM-DD_HH-MM-SS-<pid>.log to
-DD-MM-YYYY-mdu-session-HH-MM.log (hour-minute, no seconds/pid). lib/log-mode.js:
- formatSessionStamp(date) now returns `${DD}-${MM}-${YYYY}-mdu-session-${HH}-${MM}` (pid arg dropped; main.js
-  still passes process.pid, harmlessly ignored).
- resolveLogFileName session branch returns `${sid}${ext}` (the stamp is the full app-defined stem, baseName
-  ignored — single/daily still use baseName 'fileuploader').
- stripModeStampFromFileName recognizes the new format (^DD-MM-YYYY-mdu-session-HH-MM(.ext)$) and resets to the
-  default 'fileuploader' base (the new format embeds no base); the old daily + old-session strip regexes stay
-  for backward-compat with any persisted old paths. The compounding round-trip stays idempotent.
-Tests updated (formatSessionStamp, resolveLogFileName session, strip new-format, idempotency). 410 pass.
-
---
-
-# v3.3.106 — intermittent white-screen on startup (RDP/VM GPU) + export filename
-
-Two asks. (A) White screen: user sometimes gets a PURE-WHITE window on start (no error banner, NOT even the
-static menu bar) on a 12-vCPU Windows VM over RemoteDesktop. Workflow wn2k04x5t (2 agents + adversarial verify)
-nailed it by one airtight deduction: the BrowserWindow backgroundColor is DARK (#16181c, main.js:1228), so
-"white" can NEVER be an un-painted/loading/failed state — those all show DARK. Pure-white + no menu bar + no
-banner + SILENT eliminates every DOM/init/CSS/load mode (each leaves the dark styled shell, unstyled-black-on-
-white menu text, or the red init().catch banner) → the ONLY match is a GPU/compositor surface failure on the
-RDP virtual display adapter. Confirmed: NO disableHardwareAcceleration / disable-gpu / appendSwitch ANYWHERE,
-and child-process-gone (GPU) is log-only (matches the silent symptom) while render-process-gone pops a dialog.
-Renderer has ZERO WebGL/canvas/video (audited) → software compositing costs ~nothing and doesn't undo the perf
-work; a webContents.reload() doesn't disrupt uploads (uploadManager lives in main, torn down only on quit).
-Watchdog REJECTED: the GPU mode lets init complete, so an init-complete signal wouldn't detect the white screen.
-
-SHIPPED v3.3.106 (main.js — adversary's safe subset):
- app.disableHardwareAcceleration() at module top (before app.whenReady) GATED on RDP (process.env.SESSIONNAME
-  matches /^RDP/) OR a persisted gpu-disabled.flag (in userData). Zero-regression for local/console users.
- Auto-heal: on a GPU child-process-gone, write gpu-disabled.flag → next launch disables HW accel even if the
-  RDP gate missed (covers VM-via-console / bad virtual GPU). Self-healing after at most one white screen.
- Kept the child-process-gone/render-process-gone/did-fail-load instrumentation to CONFIRM on the server log
-  (caveat: root cause is the standard RDP-GPU bet, not yet confirmed on the affected machine — next white-start
-  log shows CHILD PROCESS GONE type=GPU = confirmed).
- (B) export-backup defaultPath: multi-hoster-backup-YYYY-MM-DD.mhu → DD-MM-YYYY-multihoster-backup.mhu.
-409 tests pass, clean boot (guard inert on non-RDP dev machine).
-
-DEFERRED (perf polish, workflow w5o2rpffx design ready): history JSONL + batch-start residual.
-
---
-
-# v3.3.105 — URGENT data-safety: config write fsync + account-wipe guard
-
-User report: after a server CRASHED during upload (NOT the v3.3.104 update — the other server updated fine and
-kept its accounts), the accounts/credentials were gone. Root-cause chain (in code): config writes were atomic
-(tmp+rename) but had NO fsync — a hard crash can leave electron-config.json truncated/unflushed → on restart
-load() reads the corrupt/empty file, falls to .bak, and if that's also bad returns empty DEFAULTS → the next
-settings/queue save persists EMPTY hosters → accounts permanently wiped (and the async _atomicWrite blindly
-copyFileSync'd the live → .bak, so an empty live could clobber a good .bak).
-
-SHIPPED v3.3.105 (lib/config-store.js + main.js — data-safety, no behavior change):
- fsync before rename in BOTH write paths: _atomicWrite (openSync+writeSync+fsyncSync+closeSync, then
-  guarded-.bak + rename) and main.js save-global-settings-sync (openSync+writeSync+fsyncSync+closeSync). A hard
-  crash can no longer leave a truncated config.
- _atomicWrite .bak is now GUARDED: read the live file and only refresh .bak if it's non-trivial (trim>2) —
-  an empty/truncated live can never clobber a good .bak (matches what the sync-save already did).
- WIPE-GUARD (_guardHosters): in save()/saveRotationCursors()/the sync-save, when the write does NOT
-  intentionally set hosters (config.hosters absent) AND the resulting hosters are all-empty, recover the
-  hosters from disk (_recoverHostersFromDisk tries live → .bak → .pre-history-split.bak) instead of persisting
-  the wipe. An EXPLICIT save({hosters:{}}) (user deleted all) is still allowed (hostersIntentional=true).
- load() gained a 3rd fallback tier: .pre-history-split.bak (the permanent v3.3.99 snapshot with accounts) so
-  load() itself recovers after corruption.
-2 new tests (post-wipe valid-empty live + .bak → guard restores; explicit empty NOT blocked). 409 tests pass.
-RECOVERY for the affected server: %APPDATA%\multi-hoster-uploader\electron-config.json.pre-history-split.bak
-(or .bak) → copy over electron-config.json with the app closed.
-
-DEFERRED (perf polish, workflow w5o2rpffx designs ready): history JSONL (append-only, kills per-batch 185MB
-rewrite + first-open parse via loadHistoryRecent tail-read + meta sidecar) and the batch-start one-time
-render/231ms residual. Do these AFTER the data-safety fix is confirmed stable.
-
---
-
-# v3.3.104 — virtualize the Recent-uploads panel (the last non-virtual table)
-
-v3.3.103 log (real 2464-job, 4-hoster batch → 95 concurrent): the statSync fix HELD (batch-start main spike
-336→231ms with 10× more jobs), and the whole 90s ramp to 95 active was PRISTINE (mean ~11ms, fps=32,
-longtasks=0). Residual: rapidly clicking tabs DURING the 95-active upload → renderer-longtask 210-221ms
-(proc=0ms = layout). Cause: the Recent-uploads panel (renderRecentUploadsPanel) rendered ALL sessionFilesData
-rows (≤2000) into the DOM non-virtualized — the exact analog of the History table pre-v3.3.102. Switching to
-that view laid out ~2000 rows.
-
-Workflow w23318hm0 hit transient 529 overload (no cached results); did the fix directly using the proven
-History-virtualization template + Playwright empirical verification (stronger than agent review for layout).
-
-SHIPPED v3.3.104 (renderer/app.js + styles.css):
- Virtualized renderRecentUploadsPanel mirroring History/_renderVirtualRows: tbody#recentFilesBody gets only
-  ~visible rows + top/bottom spacer <tr> (VIRTUAL_ROW_HEIGHT=28, OVERSCAN=10). Scroll handler (_onRecentScroll
-  rAF-coalesced) + ResizeObserver on .recent-files-table-wrap (doubles as show-trigger). _recentWorking holds
-  the sorted set. DROPPED the insertAdjacentHTML append-only fast path (a ~40-row window re-render is cheap);
-  every render re-renders the visible window. Scroll-position preserved on prepend (date|desc: scrollTop=0 at
-  top, else += added*ROW_HEIGHT).
- SELECTION SAFE: _buildRecentRowHtml already stamps `selected` from selectedRecentIds.has(row.order) per row,
-  so off-screen-selected rows render selected when scrolled in; selectedRecentIds stays the source of truth;
-  shift-select already uses _recentSortCache (not the DOM). applyRecentSelectionClasses toggling only visible
-  rows is correct.
- styles.css: .recent-file-row { height: 28px } so the virtualization math is exact (table already had
-  table-layout:fixed, so no column-jump fix needed unlike History).
- Empty-state guard: _renderRecentVirtualRows returns early when total=0 so it never wipes the "Noch keine
-  Uploads" message.
- PLAYWRIGHT-VERIFIED @2000 rows (bounded container): show-cost 118ms→2.4ms, DOM stays 29-39 rows, scroll maps
-  correctly (row1500→window@1486), scrollHeight exact (56014≈56000), off-screen-selected renders with class,
-  row height exactly 28. 407 tests pass, clean boot.
-
-Every large table is now virtualized (Queue, History, Recent). DEFERRED still (one-time/minor): batch-start
-~500ms first-render + residual 231ms main spike for 2464 jobs (one-time per batch); first-get-history-after-
-batch parse-cache/JSONL.
-
---
-
-# v3.3.103 — kill the batch-start 336ms main stall (synchronous statSync storm)
-
-v3.3.102 log (real 224-job batch): History virtualization CONFIRMED (no get-history on tab switch),
-steady-state pristine (fps=32, ELD 11.8ms). Residual = a ~6s BATCH-START spin-up burst: main ELD
-max=336ms @cpu=0%core + renderer-longtasks 196-391ms; settles to clean by +6s. Workflow w3bzkumo8
-(4 agents + adversarial verify) CORRECTED my hypothesis:
- My "uncapped renderer progress-drain" theory was WRONG: handleProgress only mutates JS + SCHEDULES
-  coalesced renders (rAF/200ms); render is already one-per-frame; main coalesces to ~50 latest-per-job/100ms.
-  Chunking the drain fixes nothing. ADVERSARY FOUND IT WOULD REGRESS: rAF throttles to ~0 when the window is
-  minimized (the common background-uploader state) → unbounded _pBuf backlog AND deferred persistQueueStateSoon
-  (last line of _handleProgressImpl) → terminal 'done' lost on close = the queue-persistence-ghost-fix class.
-  DEFERRED/REJECTED as sketched.
- REAL cause (cpu=0%core = blocked on I/O): synchronous fs.statSync storm in UploadManager.startBatch dedup
-  loop (lib/upload-manager.js:363-377): up to DEDUP_CHUNK=200 fs.statSync in ONE tick before yielding. 200 ×
-  ~1.68ms (measured on the VM) = the exact 336ms. Plus a per-job statSync (428). On a disk already saturated
-  by the 1MB read-ahead.
-
-SHIPPED v3.3.103 (lib/upload-manager.js — adversary's zero-risk headline fix, but the more thorough async form):
- Dedup loop: dedup synchronously (cheap Map ops), then stat the unique files in PARALLEL via
-  `await Promise.all(toStat.map(f => fs.promises.stat(f)))` per chunk → stats run on the libuv threadpool,
-  main thread NEVER blocks. Preserves the exact results-Map shape {name,size,results:[]} + dedup semantics
-  (size=0 on failure). The 336ms sync block → 0 main-thread block.
- Per-job statSync (428) → `await fs.promises.stat` (in an async fn before the first real await; cachedResult
-  fast-path already skips it for ~all jobs — consistency only).
- Tests: updated the fs.statSync mocks in upload-manager.test.js (2 sites) + suspect-reject-alternates.test.js
-  to also mock fs.promises.stat (returns the same fake sizes). 407 tests pass, clean boot.
-
-The renderer-longtasks (391/280/299ms) during the burst were (medium-confidence) the user's OWN tab clicks
-landing while the main thread was stalled — fixing the main stall frees IPC so those clicks stay responsive.
-DEFERRED still (only if needed): first-get-history-after-batch parse-cache/JSONL; the renderer chunked drain
-ONLY if ever needed for interaction-responsiveness AND gated on a high-water-mark sync drain + a
-document.hidden setTimeout fallback (never rAF-only).
-
---
-
-# v3.3.102 — virtualize the History table (the last tab-switch layout cost)
-
-v3.3.101's gate killed the get-history PARSE on tab switch, but the v3.3.101 log showed a RESIDUAL: tab
-clicks still 216ms with a ~197ms `renderer-longtask` and NO get-history (gate worked). proc=0ms → pure
-browser layout, not JS. Cause: `.view{display:none}`→`.active{display:flex}` + the History table builds up
-to 2000 `<tr>` NON-virtualized (renderHistoryTable), so showing the view lays out 2000 rows (~197ms on the
-RDP VM). The queue was already virtualized; history was the only non-virtual large table.
-
-MEASURED with Playwright (real DOM, this machine; VM ≈1.7×):
- current 2000 rows auto-layout: 118ms ; content-visibility+fixed: 117ms (USELESS — rows still laid out)
- cap 300: 16ms (but rejected: history rows are per-file×hoster, a single 1280-file batch ≈3840 rows, so a
-  small cap would HIDE a recent batch's links)
- virtualize (40 visible of 2000): 2.3ms ✓
-Verified the virtualization end-to-end @6000 rows: showCost 1.1ms, DOM stays 32-42 rows, scroll maps
-correctly (top=row0/mid=row2990/bottom=row5999), scrollHeight exact, columns STABLE (table-layout:fixed),
-rows update on scroll.
-
-SHIPPED v3.3.102 (renderer/app.js + styles.css):
- Virtualized renderHistoryTable mirroring the queue's _renderVirtualRows: header always rendered, tbody#historyBody
-  gets only visible rows + top/bottom spacer `<tr>` (VIRTUAL_ROW_HEIGHT=28, OVERSCAN=10). Scroll handler
-  (_onHistoryScroll, rAF-coalesced) + ResizeObserver on #historyContainer — the ResizeObserver doubles as the
-  show-trigger (hidden 0×0 container → visible size → re-render at correct height). Sort resets scrollTop=0 +
-  re-renders. Click delegation (copy-link / sort) unchanged. _historyWorking holds the sorted working set.
- styles.css: `.history-table{table-layout:fixed}` + scoped col widths (16/34/12/38%) so columns don't jump as
-  rows scroll in/out (does NOT touch the shared .col-* used by the queue). Measured: content-visibility was a
-  no-op, so NOT used.
-All rows stay scrollable (no UX loss); show cost ~100× lower. 407 tests pass, clean boot. Playwright-verified.
-
-DEFERRED still (only if needed): the FIRST get-history after a new batch parses 185MB once (~450ms) — needs
-the ConfigStore parse-cache (+185MB RAM, guarded) or JSONL. appendHistory still rewrites 185MB per batch-done
-(JSONL fixes that). The ~625ms batch-start spin-up + 107ms debug-log residuals.
-
---
-
-# v3.3.101 — History-tab lag: gate the unconditional reload + fix the diagnostics history regression
-
-v3.3.100's interaction instrument named the residual exactly: EVERY slow click was `button.tab`/`nav.tab-bar`
-(200–840ms), each coupled to `ipc get-history wall=150-200ms sync` + `main-longtask blocked=242-289ms
-lastIpc=get-history` + `renderer-longtask 200-248ms`. Uploads themselves pristine (ELD mean 11.7ms; the only
-spikes line up with the get-history tab-switches). Workflow wgxr06myb (4 agents + adversarial verify):
- get-history fires ONLY entering the History tab (not every tab) — but the handler called loadHistory()
-  UNCONDITIONALLY (app.js:362-365) despite tracking `_historyDirty` and never checking it. Each call:
-  synchronous readFileSync+JSON.parse of the ~185MB / 30000-entry electron-history.json (no cache), ships all
-  30000 over IPC, renderer flattens ~120000 row objects then .slice(-2000) for the DOM (DOM already capped 2000).
- Adversary safe subset = STEP 1 ALONE (gate the load, dirty-coverage verified complete: every append routes
-  batch-done→appendHistory + upload-batch-done→handleBatchDone sets _historyDirty=true). Zero risk.
-
-SHIPPED v3.3.101 (STEP 1 + a regression fix, both safe):
- renderer/app.js: gate `if (tab.dataset.view==='history' && (_historyDirty || !_historyEverLoaded)) loadHistory()`;
-  added `_historyEverLoaded`, set both flags inside loadHistory() AFTER the await succeeds (retry on failure).
-  → REPEAT History tab-switches (no new uploads) now do ZERO ipc/parse/flatten = instant. (Honest limit: the
-  FIRST History open after a new batch still parses 185MB once ~450ms — needs the parse-cache, see below.)
- lib/diagnostics-collectors.js + main.js: getHistory now reads loadHistory() not load().history — fixes a
-  CORRECTNESS regression I introduced in v3.3.99 (migrated mode → load().history is [] → remote diagnostics
-  reported totalBatches:0 despite 30000 real batches). Backward-compatible fallback kept. +2 regression tests.
-
-407 tests pass, clean boot.
-
-DEFERRED (adversary-flagged, by design — do only if the next log/user still shows pain):
- STEP 2(1) ConfigStore parse-cache for history (mtime+size key, invalidate BOTH _writeHistoryFileAtomic AND
-  _writeHistoryFileDurable, slice-before-push for 'all'-retention same-ref aliasing). Makes first-after-upload
-  switch instant + appendHistory read-half free, but ADDS ~185MB resident in main (NOT a relocation — adversary
-  corrected the design's false RAM claim). 
- STEP 2(2) slice get-history to last-N-batches: REGRESSION VECTOR (breaks browse/sort-all 30000), needs a
-  net-new paging/search-in-main IPC + UI that doesn't exist. Defer.
- JSONL append-only storage: the ONLY thing that kills appendHistory's 185MB-rewrite-per-batch-done AND the
-  parse entirely (tail-readable). On-disk format migration → own careful build.
- Two minor independent residuals from the sweep: ~625ms batch-start spin-up (synchronous 22-job build/prime
-  burst in one tick) + 107ms debug-log block mid-batch. Separate, low priority.
-
---
-
-# v3.3.100 — close the LAST measurement gap: renderer interaction timing (switches/clicks)
-
-User asked "haben wir wirklich ALLES gemessen, auch switches/wechsel?". Audit: main-side was already
-fully covered (IPC wrapper ≥50ms on every handler, main-longtask >100ms with lastIpc, config instrument);
-account switchAccount is a trivial sync Map-set + the rotation work is async (can't block) → already covered.
-The REAL gap was RENDERER-side: renderer-perf was upload-gated (idle clicks unmeasured) and only aggregate
-(no per-interaction latency, no element attribution). Closed it (renderer/app.js, additive, self-silencing):
- Event Timing API observer (`type:'event', durationThreshold:50, buffered`) → `renderer-interaction <type>
-  dur=Xms proc=Yms target=<el>` for EVERY UI interaction ≥50ms (switch/sort-header/tab/button), always-on,
-  names the element (id/class/data-action/aria-label). The direct "click→reaction" latency.
- Idle renderer-longtask logging: any longtask ≥100ms logged immediately (`renderer-longtask dur=Xms`),
-  not just during uploads.
-405 tests pass, clean boot. Now EVERY action — main or renderer, idle or under load — names itself if slow.
-
---
-
-# v3.3.99 — THE KILL: 38.5MB config-thrash → history split out of the hot config + full instrumentation
-
-THE ROOT CAUSE (from v3.3.98's instrument, the real "bread"): electron-config.json was **38.5MB** and got
-loaded/cloned/serialized **137× in 73s** on the main thread (140-592ms each) = **~47% main-thread occupancy**
-→ that IS the 1-2s button lag. The 1MB read-ahead was irrelevant against it. NOT the queue (`queue=undefined`
-was a LOGGING BUG: read `.length` on the pendingQueue OBJECT); the bulk is HISTORY — each batch-done appended
-the full per-file result list (`summary.files` w/ per-hoster URLs), 75 batches, default historyRetention='all'
-never prunes → unbounded. (5-agent workflow wz2g4bwka + adversarial verify; bench fixture confirmed 185MB =
-100MB history/30000 entries.)
-
-Why writes drove the storm: save-global-settings (queue-persist) did 2 loads + 1 serialize per call, and
-_atomicWrite NULLS the cache → next load is a full 38.5MB reparse. Even cache HITS structuredCloned 38.5MB.
-Per-job upload path makes ZERO config calls (selectUploadAuth/rotation take config by param) — pending=1280
-is NOT the driver.
-
-THE FIX (history split — kills clone AND serialize AND reparse at once; advisor-gated, adversarially verified):
- History moved to its OWN file **electron-history.json** (lib/config-store.js). _migrateHistory() runs ONCE
-  at init (packaged only), fail-safe: write history.json + fsync + verify count BEFORE the config is ever
-  allowed to drop history, keep a permanent `electron-config.json.pre-history-split.bak`. _loadImpl returns
-  `history:[]` when migrated → cached result is tiny → clones cheap; config file shrinks to ~KB on the first
-  save() → reparse cheap; _serializeForDisk writes ~KB → serialize cheap. loadHistory/appendHistory/
-  pruneHistory/clearHistory redirected to history.json (own write-queue, no-clobber guard); legacy config
-  path kept as fallback when migration fails. get-history/export-history go through loadHistory.
- REAL 194MB-FIXTURE VALIDATION: migrate 1.5s (1×), all 30000 entries preserved + .bak; load() 631ms cold
-  (1×) → **0.1ms** after strip; save() strips config **185MB→2.1KB**; loadHistory() still 30000. RESULT:
-  data-preserved=true, hotpath-fast=true.
- DROPPED per advisor (one-variable + risk): loadShallow (moot after split), Fix#2 cache-repopulate (dead
-  gate), Fix#4 resolution-cache (stale-cache → rotation/byse failover-regression class — the one thing that
-  could SILENTLY corrupt uploads). Fix#3 (this split) was the only complete fix.
-
-"MEASURE EVERYTHING" instrumentation (user demand) — all additive, threshold-gated, MHU_PERF=0 to disable:
- IPC handler wrapper (monkey-patch ipcMain.handle/.on) → `ipc <channel> wall=Xms sync=Yms` ≥50ms = the
-  button-press→response latency, hardened so a logging throw can never break IPC (Promise.resolve(p).finally).
- Main-process long-task drift monitor (setInterval 100ms) → `main-longtask blocked=Xms lastIpc=… gc=… gcMax=…`
-  for any single main-thread turn >100ms (catches GC, fs scans, serialize the IPC wrapper structurally can't see).
- config-store: caller attribution `via=<stack>` + `wqDepth=` on config-load/config-serialize lines; FIXED the
-  `queue=` logging bug (now reads pendingQueue.queueJobs.length).
-
-405 tests pass (9 new migration tests covering preserve-count, round-trip, save()-never-loses-history,
-crash-window fallback, idempotency). Clean Electron boot (9s, no errors). No repo pollution (migration packaged-only).
-NEXT LOG must show: config-load/config-serialize wall= drop to single digits (or vanish), main-longtask rare,
-ipc lines name any residual. If a residual remains it's pendingQueue (own follow-up, not a regression).
-
---
-
-# v3.3.98 — read-burst absorption (1MB hwm) + persist/load instrument; B (renderer) DEFERRED
-
-v3.3.97 (threadpool 64→8) was a DECISIVE win: mean ELD 200ms→~11ms at 70 active (18×), renderer healthy
-14/15 windows. User: "ganz flüssig isses noch nicht". A 5-agent ultracode workflow + adversarial verify
-localized the RESIDUAL to TWO distinct, measured spike sources (full data: subagents output wjskjo1xk):
-
-1. READ-BURSTS (tail W13/14/15, 15:18:53-19:04): FSReqCallback 66/70/46 vs threadpool=8 (~8.75× queue
-   depth), SimpleWriteWrap collapses to 7/4/24, mean climbs 12.9→30.3→41.9ms. GC EXCLUDED (gcMax ≤27ms
-   always). The FSReq↔SimpleWrite inversion at stable active=70/pending=1287 proves reads are CAUSAL, not
-   a symptom of a block elsewhere.
-2. SYNC CONFIG PERSIST (suspected): save()→load() reparses the WHOLE electron-config.json (1287-job
-   pendingQueue nested in globalSettings + full history) on every persist because _atomicWrite nulls the
-   cache; _serializeForDisk JSON.stringify(...,null,2) of all of it. W13's single 1021ms max with heap→142MB
-   fits a big synchronous structuredClone+stringify. CAVEAT (advisor): W13 is ONE confounded sample (also
-   FSReq=66) and the ONLY heap-spike window; W4(415ms,heap41) & W10(852ms,heap18) are LOW-heap → NOT persist
-   clones → likely the SECONDARY suspect: account-failed's synchronous configStore.load() per failure near
-   connection churn (W6 teardown had doodstream connect-timeouts). So: INSTRUMENT, don't claim "found a 1s
-   freeze".
-
-SHIPPED v3.3.98 (one-variable discipline — advisor cut B to keep the next measurement clean):
- A: highWaterMark 256KB→1MB in all 5 streaming read loops (hosters.js:291, doodstream:342, voe:245,
-  vidmoly:190 CHUNK_SIZE consts; clouddrop:108 inline — NOT clouddrop:12's 16MB server chunk). Keep tp=8.
-  Deepens per-stream read-ahead 0.43s→~1.7s (absorbs threadpool-queue latency so writes don't starve),
-  4× fewer read completions + allocs. Zero multipart byte-risk (Content-Length=preamble+fileSize+epilogue,
-  independent of chunk size). REVERSIBLE PROBE; read-semaphore held in reserve (trigger: FSReq still ~70 +
-  writes starved + mean elevated after 1MB).
- C-instrument (BROADENED per advisor): config-store.js times load() (full reparse, incl. account-failed
-  path) AND _commit serialize; logs `config-load wall=Xms cache=hit/miss hist=N queue=M` and
-  `config-serialize wall=Xms bytes=Y hist=N queue=M` when ≥20ms (perfLog hook set in main.js via
-  configStore.setPerfLog→logInfo). load() split into wrapper + _loadImpl. 397 tests pass.
- B (renderer chunked rAF batch drain, app.js:188-193 — the 243ms longtask at W14) DEFERRED: renderer was
-  healthy 14/15 windows and the one longtask is DOWNSTREAM of the main-thread read-burst flooding IPC.
-  Fix A should make it self-heal. Bundling B would confound attribution + touches the progress hot path
-  that bit before (formatDateTime burst, ghost-fix). Add B next round ONLY if renderer still janks after A.
-
-NEXT LOG answers 3 things cleanly: (1) did A kill the read-bursts (FSReq per-window + tail mean drop)?
-(2) is the persist/load actually heavy (new config-load/config-serialize lines + their wall/queue/hist)?
-(3) did the renderer self-heal from A alone (longtasks back to 0)? Then decide: persist refactor for v3.3.99
-(queue-out-of-config OR cache-repopulation — latter lower-risk but renderer's incoming globalSettings isn't
-default-merged like load() produces, so confirm merge-equivalence first), and/or B, and/or read-semaphore.
-
---
-
-# v3.3.97 — DECISIVE ELD finding: file-read phase-flip + threadpool 64→8 + GC instrument
-
-The v3.3.96 `eventloop-delay` logs gave the decisive signal. At CONSTANT active-count, the system flips
-between two regimes:
- HEALTHY (ELD ~11ms, rss 268–308MB): `SimpleWriteWrap ≈ active`, `FSReqCallback ≈ 0–1` (write/network-bound)
- BLOCKED (ELD 49–217ms, rss 540–610MB): `FSReqCallback ≈ active` (62–71 file reads in flight), `SimpleWriteWrap ≈ 0–4`
-ELD spike + rss balloon both track `FSReqCallback` → file-read path through the libuv threadpool, NOT crypto,
-NOT renderer, NOT GC-alone. All 5 uploaders read identically (256KB createReadStream); byse/dood/voe run
-through the GENERIC uploadFile in hosters.js (no dedicated module).
-
-Advisor caveats baked into the build (do NOT skip on re-measure):
-1. Causation UNPROVEN — high FSReqCallback could be a SYMPTOM (blocked loop can't drain read-completions).
-2. rss math kills "read buffers ballooned": 70×256KB ≈ 18MB, but rss swings ~300MB → heap/object churn (GC).
-3. Cheapest discriminator already wired: `UV_THREADPOOL_SIZE` 64→8 (1 line, reversible, NOT an upload cap;
-   8×256KB reads ≈ 100MB/s ≫ 41MB/s aggregate). Suspect tp=64 made it WORSE (removed read-serialization).
-
-Shipped v3.3.97 = candidate-fix + discriminator in one build:
- main.js:1 `UV_THREADPOOL_SIZE` 64→8.
- ELD line now also logs `heap=`(heapUsed) `ext=`(external) `ab=`(arrayBuffers) `gc=`/`gcTotal=`/`gcMax=`ms
-  (PerformanceObserver entryTypes:['gc'], reset per window).
-
-DECISION RULE for the next user log:
- ELD drops with tp=8 → read over-parallelism confirmed → keep 8 or productionize a DEDICATED read-semaphore.
- ELD high + gcTotal/gcMax align with spikes → heap churn → hunt the allocator (semaphore would be wasted).
- ELD high + gc flat → causation reversed (symptom) → pivot.
-WAIT for the next `eventloop-delay` log before any read-path refactor. NO upload cap (user rejected it).
-
---
-
-# v3.3.94 — comprehensive measurement build (user: "mach alles messen was man messen kann")
-
-Localization so far (each step EMPIRICAL, not by elimination — advisor caught the elimination-leap):
- Renderer queue render PROVEN cheap: loaded the REAL app.js in headless Chromium (Playwright) with a mocked
-  window.api, populated Q=1000 / 61 active / progress sort, drove the real onUploadProgressBatch +
-  renderQueueTable + scroll → ALL <0.5ms. (Caveat: component cost, not frame rate.)
- User CONFIRMED the discriminator: a full 1000-row queue scrolls SMOOTH when idle, ruckelt ONLY while ~61–70
-  uploads are active → the lag is driven by the active uploads (main-process / system load), not the table.
- Screenshot: 70 connections, 1413 files, 41.3 MB/s, "write ECONNRESET". ECONNRESET is already classified
-  transient (upload-manager _isTransientNetworkError line 171 → retried, not account-fatal) — it's the
-  SIGNATURE of oversubscription (servers RST the excess connections). Same root cause as the lag.
-
-Immediate user lever (already exists): Settings → Uploads → "Globale parallele Uploads" (parallelUploadCount,
-global semaphore, default 0=off). Capping total concurrent uploads (~20) should fix lag AND ECONNRESET AND
-likely keep throughput (bandwidth-limited at 41 MB/s; reset connections waste bandwidth on retries).
-
-SHIPPED measurement (all additive, zero upload-behavior change) to pinpoint CPU-vs-IO vs renderer from the
-user's REAL 70-connection run:
- main.js ELD line now also logs: cpu=X%core (process.cpuUsage delta / wall, >100% = multi-core),
-  rss=YMB, active-by-hoster={dood:.., voe:.., ...} (per-hoster live connection distribution → shows which
-  hoster is oversubscribed), transient-errs=N (cumulative ECONNRESET-class on the primary path), pending=M.
- lib/upload-manager.js: getDiagnostics() {activeByHoster, transientErrors, pending, active}; activeEntry
-  now carries hoster; _transientErrorTotal++ in the primary catch when _isTransientNetworkError.
- renderer/app.js: PerformanceObserver('longtask') + a rAF frame-time monitor → logs every 5s WHILE
-  uploading: `renderer-perf active=N fps=X jankFrames=Y worstFrame=Zms longtasks=W maxTask=Vms`. This is the
-  DIRECT renderer ground truth (the component-timing harness couldn't capture real frame rate). Low fps /
-  high jankFrames / longtasks → renderer IS blocked; ~60fps + no jank while it still feels laggy → it's the
-  main-process/system, and the cpu=/eld= numbers in the same log say CPU-bound (→ workers/cap) vs IO-bound.
-Both logs land in the normal debug log (logInfo / window.api.debugLog). 397/397 tests, eslint clean.
-
-NEXT: user runs the 70-load on v3.3.94, shares the `eventloop-delay` + `renderer-perf` log lines (or connects
-diagnostics). Those two lines together localize it definitively. Do NOT build workers/cap before that.
-
---
-
-# v3.3.93 — THE renderer lag knot FOUND + FIXED + MEASURED: formatDateTime per progress event
-
-User gave the decisive data: "25 connections okay, 50+61 laggt, EVTL wenn die uploadenden Zeilen nicht im
-Bild sind." Two regime facts (asked, not assumed — advisor caught the assume-the-regime trap a 3rd time):
-queue = 200–1000 rows (VIRTUAL mode) + sort = clicked PROGRESS/SPEED (dynamic). This killed the non-virtual
-reflow theory (off-screen rows aren't in the DOM when virtual) AND pointed at the per-event path.
-
-ROOT CAUSE (renderer process, NOT main — the v3.3.91 ELD log can't see this): `maybeAddSessionFile(job)`
-computed `const dt = formatDateTime(new Date())` UNCONDITIONALLY at the top, before the `status==='done'`
-check that early-returns for everything else. formatDateTime does TWO Intl locale formats
-(toLocaleDateString + toLocaleTimeString) = ~83µs/call MEASURED. It runs on EVERY progress event
-(onUploadProgressBatch loops the M-item batch → handleProgress → _handleProgressImpl → maybeAddSessionFile),
-i.e. 10×M/sec, and THROWS IT AWAY for all non-done events (the overwhelming majority while uploading).
- Scales exactly with M (active count): 250/sec at M=25 → 610/sec at M=61.
- Bursts: each progress batch runs M calls back-to-back = a SYNCHRONOUS main-thread block of
-  ~2.4ms (M=25) → ~5ms (M=61) every 100ms, on top of render+sort → blows the 16ms frame budget → scroll
-  stutter. Scroll-independent (per-event, not per-render) → matches "lag when actives off-screen" exactly.
-  This is the 25→50 cliff.
-
-FIX: move `const dt = formatDateTime(new Date())` inside the `if (!_sessionFileKeys.has(dedupKey))` block, so
-it runs ONCE per genuinely-new completed upload, never per progress tick.
-
-VERIFIED (faithful Blink benchmark at the CONFIRMED regime: Q=500 virtual, dynamic progress sort, scrolling,
-M=25/50/61, OLD vs FIXED): per-batch cost 1.7/3.2/4.1 ms (OLD, scales with M) → 0.0/0.0/0.0 ms (FIXED, flat).
-Frame P95 7.3→4.2 ms at M=61. M-scaling ELIMINATED. The render/scroll path itself is flat ~2.5ms median
-across all M → NO second knot there. updateStatusBar/StatsPanel = one cached O(Q) arithmetic pass (cheap);
-updateQueueActionButtons = O(selection) (cheap). No other Intl/Date on any per-event/per-frame hot path
-(2582 = job-log modal, 4587 = History view — both on-demand/cold). 397/397 tests pass, eslint clean.
-
-NOTE: the v3.3.91/92 main-process event-loop-delay instrument is for the OTHER (CPU-vs-IO) hypothesis and is
-a separate process — keep it; it still answers whether the main thread also saturates at 50+ TLS streams.
-
---
-
 # High-concurrency lag audit (v3.3.90) — "lag ist immernoch da, ich vermute ab X gleichzeitig muss er alle Zeilen gebündelt updaten"

 Method: 44-agent high-concurrency audit of the full upload→IPC→render path + Blink benchmark of the
@ -501,25 +66,8 @@ from the user's real load, not the sandbox. Per-uploader undici Agent audit: clo
 module-level Agent (connections:50); doodstream/voe/vidmoly use the global dispatcher (pooled per origin, NO
 per-call agent explosion) — so no agent fix needed.

-## v3.3.92 — make the single measurement decisive + breadth audit of un-checked main.js hot paths
-Enriched the ELD log line with `process.getActiveResourcesInfo()` as a compact type-histogram:
-`eventloop-delay active=N mean/p99/max/stddev ms threadpool=64 resources=K {TCPSocketWrap:50,FSReqCallback:4,...}`.
-Now ONE run splits all three readings in a single line: high mean/p99 → CPU-blocked (workers/cap);
-low delay + many TCP/FS/GetAddrInfo resources → IO-bound queueing (threadpool/sockets, NOT workers);
-low delay + few resources → not saturated (lag elsewhere / perception). Pure numbers, no redaction surface.
-
-Breadth audit this round (4th /goal re-fire, code I wrote, NOT re-measuring cleared render/persist):
- main.js logging (debug/rot/upload): all buffered + ASYNC fs.appendFile (write-guard flag, 500ms timer,
-  setImmediate re-flush). Sync appendFileSync ONLY in crash/signal/exit handlers (correct there). CLEAN.
- main.js progress coalescing (_progressByJob Map + 100ms batch → one upload-progress-batch via safeSend):
-  non-terminal = Map.set (keeps latest/job); gated upstream to 4/sec/job. CLEAN at N=50.
- _appendJobLog: capped in-memory ring buffer (Map, FIFO-evict). CLEAN.
- All 5 uploaders: doodstream/voe/vidmoly/clouddrop-simple stream via async createReadStream + for-await +
-  async throttle.consume; clouddrop-chunked now async fh.read. NONE block the main loop per chunk. CLEAN
-  (clouddrop's old readSync was the unique outlier, fixed v3.3.90).
-
 ## NEXT (gated on the real-app ELD number + user's explicit nod)
-User runs their 50-concurrent load once; the enriched `eventloop-delay` log line decides:
+User runs their 50-concurrent load once; the `eventloop-delay` log lines decide:
 - mean/p99 HIGH (tens–hundreds ms) → CPU-blocked → propose worker_threads/child-process upload pool OR a
  smart concurrency cap (WITH the user's nod — it's hard to reverse and touches credentials/abort/rotation).
 - delay LOW while it still lags → IO-bound → threadpool bump already addresses it; if not, look at socket
--- a/tests/config-store.test.js
+++ b/tests/config-store.test.js
@ -17,7 +17,6 @@ function createStore() {
  // We override by setting filePath directly
  store = new ConfigStore(fakeApp);
  store.filePath = path.join(tmpDir, 'electron-config.json');
-  store.historyPath = path.join(tmpDir, 'electron-history.json');
  return store;
 }

@ -293,117 +292,4 @@ describe('ConfigStore', () => {
    const config = store.load();
    assert.equal(config.hosters['doodstream.com'][0].apiKey, 'from-backup');
  });
-
-  it('wipe-guard: a settings-only save recovers accounts from .bak when the live config validly has none', async () => {
-    // Post-wipe state: live config parses fine but has empty hosters; a backup still holds the accounts.
-    fs.writeFileSync(store.filePath, JSON.stringify({ hosters: {}, hosterSettings: {}, globalSettings: {}, history: [] }), 'utf-8');
-    fs.writeFileSync(store.filePath + '.bak', JSON.stringify({
-      hosters: { 'voe.sx': [{ id: 'v1', authType: 'api', apiKey: 'survive-key' }] },
-      hosterSettings: {}, globalSettings: {}, history: []
-    }), 'utf-8');
-    await store.save({ globalSettings: { alwaysOnTop: true } });
-    const cfg = store.load();
-    assert.ok(cfg.hosters['voe.sx'] && cfg.hosters['voe.sx'].length === 1, 'guard must restore accounts from .bak, not persist the wipe');
-    assert.equal(cfg.hosters['voe.sx'][0].apiKey, 'survive-key');
-    assert.equal(cfg.globalSettings.alwaysOnTop, true);
-  });
-
-  it('wipe-guard: an explicit save({hosters:{}}) (user deleted all) is NOT blocked', async () => {
-    await store.save({ hosters: { 'doodstream.com': [{ id: 'd1', authType: 'api', apiKey: 'k' }] } });
-    await store.save({ hosters: {} });
-    const cfg = store.load();
-    assert.equal((cfg.hosters['doodstream.com'] || []).length, 0, 'an intentional hosters write must be allowed to empty them');
-  });
-});
-
-describe('ConfigStore history split (electron-history.json)', () => {
-  let dir;
-  let s;
-
-  function makeStore() {
-    const st = new ConfigStore({ isPackaged: false, getPath: () => dir });
-    st.filePath = path.join(dir, 'electron-config.json');
-    st.historyPath = path.join(dir, 'electron-history.json');
-    return st;
-  }
-
-  function writeConfigWithHistory(n) {
-    const history = [];
-    for (let i = 0; i < n; i++) history.push({ id: `batch-${i}`, timestamp: 1750000000000 + i, total: 3, files: [{ name: `f${i}.mkv` }] });
-    fs.writeFileSync(path.join(dir, 'electron-config.json'), JSON.stringify({
-      hosters: { 'byse.sx': [{ id: 'a1', authType: 'api', apiKey: 'k' }] },
-      hosterSettings: {}, globalSettings: { historyRetention: 'all' }, history
-    }), 'utf-8');
-  }
-
-  beforeEach(() => { dir = fs.mkdtempSync(path.join(os.tmpdir(), 'cfg-hist-')); s = makeStore(); });
-  afterEach(() => { fs.rmSync(dir, { recursive: true, force: true }); });
-
-  it('migration moves history into electron-history.json, preserving every entry', () => {
-    writeConfigWithHistory(50);
-    s._migrateHistory();
-    assert.equal(s._historyMigrated, true);
-    assert.ok(fs.existsSync(s.historyPath));
-    const hist = JSON.parse(fs.readFileSync(s.historyPath, 'utf-8'));
-    assert.equal(hist.length, 50);
-    assert.equal(hist[0].id, 'batch-0');
-    assert.equal(hist[49].id, 'batch-49');
-    assert.ok(fs.existsSync(s.filePath + '.pre-history-split.bak'), 'a permanent pre-split backup is kept');
-  });
-
-  it('after migration load() excludes history (cheap hot path) but loadHistory() returns the real data', () => {
-    writeConfigWithHistory(30);
-    s._migrateHistory();
-    assert.deepEqual(s.load().history, [], 'history is not carried in the always-loaded config');
-    assert.equal(s.loadHistory().length, 30);
-  });
-
-  it('appendHistory writes to history.json; the next config write strips stale history from the config file', async () => {
-    writeConfigWithHistory(10);
-    s._migrateHistory();
-    await s.appendHistory({ id: 'new-batch', timestamp: 1750000099999, total: 1, files: [{ name: 'x.mkv' }] });
-    assert.equal(s.loadHistory().length, 11, 'append goes to history.json');
-    await s.save({ globalSettings: { alwaysOnTop: true } });
-    const onDisk = JSON.parse(fs.readFileSync(s.filePath, 'utf-8'));
-    assert.ok(!onDisk.history || onDisk.history.length === 0, 'a config write strips stale history from the config file');
-    assert.equal(s.loadHistory().length, 11, 'history.json is unaffected by the config write');
-  });
-
-  it('save({globalSettings}) after migration NEVER loses history (data-loss invariant)', async () => {
-    writeConfigWithHistory(40);
-    s._migrateHistory();
-    await s.save({ globalSettings: { alwaysOnTop: true } });
-    assert.equal(s.loadHistory().length, 40, 'a settings write must not touch history');
-    assert.equal(s.load().globalSettings.alwaysOnTop, true);
-  });
-
-  it('clearHistory empties history.json only', async () => {
-    writeConfigWithHistory(20);
-    s._migrateHistory();
-    await s.clearHistory();
-    assert.equal(s.loadHistory().length, 0);
-  });
-
-  it('migration is idempotent — re-running with history.json present does not re-derive or clobber', () => {
-    writeConfigWithHistory(15);
-    s._migrateHistory();
-    const after = makeStore();
-    after._migrateHistory();
-    assert.equal(after._historyMigrated, true);
-    assert.equal(after.loadHistory().length, 15);
-  });
-
-  it('crash-window fallback: not migrated + no history.json → loadHistory reads config.history', () => {
-    writeConfigWithHistory(7);
-    assert.equal(s._historyMigrated, false);
-    assert.equal(s.loadHistory().length, 7, 'legacy path still serves history if migration never ran');
-  });
-
-  it('pruneHistory trims history.json and persists the retention setting', async () => {
-    writeConfigWithHistory(12);
-    s._migrateHistory();
-    const res = await s.pruneHistory('all', { dryRun: false });
-    assert.equal(s.loadHistory().length, 12);
-    assert.ok(res.keptBatches === 12);
-  });
 });
--- a/tests/diagnostics-collectors.test.js
+++ b/tests/diagnostics-collectors.test.js
@ -53,32 +53,6 @@ test('getConfigRedacted strips password/apiKey/token/webhookUrl and value-scrubs
  assert.ok(!json.includes('WBHOOKSECRETTOKEN'), 'webhook secret must be redacted');
 });

-test('getHistory reads loadHistory (migrated mode: loadConfig().history is empty)', () => {
-  const c = createCollectors({
-    loadConfig: () => ({ hosters: {}, globalSettings: {}, history: [] }),
-    loadHistory: () => [
-      { timestamp: '2026-01-01T00:00:00.000Z', files: [{ name: 'a.mkv', results: [{ hoster: 'voe.sx', status: 'done', url: 'https://voe.sx/a' }] }] },
-      { timestamp: '2026-01-02T00:00:00.000Z', files: [{ name: 'b.mkv', results: [{ hoster: 'byse.sx', status: 'done', url: 'https://byse.sx/b' }] }] }
-    ],
-    getAllLogPaths: () => ({ logDir: os.tmpdir() }),
-    support, stats,
-    appInfo: () => ({}), systemInfo: () => ({}), agentInfo: () => ({})
-  });
-  const out = c.getHistory({ limit: 10 });
-  assert.equal(out.totalBatches, 2, 'must report real history from loadHistory, not the empty load().history');
-  assert.equal(out.returned, 2);
-});
-
-test('getHistory falls back to loadConfig().history when loadHistory is absent (legacy mode)', () => {
-  const c = createCollectors({
-    loadConfig: () => ({ hosters: {}, globalSettings: {}, history: [{ timestamp: '2026-01-01T00:00:00.000Z', files: [] }] }),
-    getAllLogPaths: () => ({ logDir: os.tmpdir() }),
-    support, stats,
-    appInfo: () => ({}), systemInfo: () => ({}), agentInfo: () => ({})
-  });
-  assert.equal(c.getHistory({ limit: 10 }).totalBatches, 1, 'legacy path reads load().history when loadHistory not injected');
-});
-
 test('readLog redacts a planted token and a Bearer line; doodstream is NOT readable; unknown name rejected', () => {
  const { collectors } = makeFixture();
  const dbg = collectors.readLog({ name: 'debug', tailKb: 64 });
--- a/tests/log-mode.test.js
+++ b/tests/log-mode.test.js
@ -57,23 +57,13 @@ test('resolveLogFileName: daily mode → fileuploader-YYYY-MM-DD.log', () => {
  );
 });

-test('resolveLogFileName: session mode → <sessionId>.log (baseName ignored)', () => {
+test('resolveLogFileName: session mode → fileuploader-session-<id>.log', () => {
  assert.equal(
-    resolveLogFileName({ baseName: 'fileuploader', ext: '.log', mode: 'session', sessionId: '26-05-2026-mdu-session-22-44' }),
-    '26-05-2026-mdu-session-22-44.log'
+    resolveLogFileName({ baseName: 'fileuploader', ext: '.log', mode: 'session', sessionId: '2026-05-28_22-44-52-12345' }),
+    'fileuploader-session-2026-05-28_22-44-52-12345.log'
  );
 });

-test('formatSessionStamp: DD-MM-YYYY-mdu-session-HH-MM', () => {
-  const { formatSessionStamp } = require('../lib/log-mode');
-  assert.equal(formatSessionStamp(new Date(2026, 5, 26, 6, 2, 36)), '26-06-2026-mdu-session-06-02');
-});
-
-test('formatSessionStamp: appends a 6-digit suffix when a rand is supplied', () => {
-  assert.equal(formatSessionStamp(new Date(2026, 5, 26, 6, 2, 36), '847581'), '26-06-2026-mdu-session-06-02-847581');
-  assert.equal(formatSessionStamp(new Date(2026, 5, 26, 6, 2, 36), 847581), '26-06-2026-mdu-session-06-02-847581');
-});
-
 test('resolveLogFileName: session mode with missing sessionId falls back to single (never emits malformed name)', () => {
  assert.equal(
    resolveLogFileName({ baseName: 'fileuploader', ext: '.log', mode: 'session' }),
@ -112,17 +102,12 @@ test('stripModeStampFromFileName: strips a session-stamp suffix (with and withou
  );
 });

-test('stripModeStampFromFileName: new DD-MM-YYYY-mdu-session-HH-MM resets to the default base', () => {
-  assert.equal(stripModeStampFromFileName('26-06-2026-mdu-session-06-02.log'), 'fileuploader.log');
-  assert.equal(stripModeStampFromFileName('26-06-2026-mdu-session-06-02-847581.log'), 'fileuploader.log');
-});
-
 test('regression: resolveLogFileName(stripModeStampFromFileName(...)) is idempotent — persisting then re-resolving never compounds stamps', () => {
  // This is the exact bug shape: persist the resolved path, then on next call
  // re-resolve from the saved base — must produce the same file, not a doubled
  // session-stamped one. The fix is the strip; this test guards against
  // regressing _persistFallbackLogPath into the 3.3.35 bug.
-  const sessionId = '03-06-2026-mdu-session-18-16';
+  const sessionId = '2026-06-03_18-16-20-8132';
  const dailyDate = new Date(2026, 5, 3);
  for (const mode of ['daily', 'session']) {
    const date = mode === 'daily' ? dailyDate : new Date();
@ -144,7 +129,12 @@ test('formatDateStamp: zero-pads month and day', () => {
  assert.equal(formatDateStamp(new Date(2026, 11, 31)), '2026-12-31');
 });

-test('formatSessionStamp: DD-MM-YYYY-mdu-session-HH-MM (no seconds/pid)', () => {
-  assert.equal(formatSessionStamp(new Date(2026, 4, 28, 7, 9, 5)), '28-05-2026-mdu-session-07-09');
-  assert.equal(formatSessionStamp(new Date(2026, 4, 28, 22, 44, 52)), '28-05-2026-mdu-session-22-44');
+test('formatSessionStamp: produces YYYY-MM-DD_HH-MM-SS-pid', () => {
+  const d = new Date(2026, 4, 28, 7, 9, 5);
+  assert.equal(formatSessionStamp(d, 12345), '2026-05-28_07-09-05-12345');
+});
+
+test('formatSessionStamp: omits the pid suffix when none provided', () => {
+  const d = new Date(2026, 4, 28, 22, 44, 52);
+  assert.equal(formatSessionStamp(d), '2026-05-28_22-44-52');
 });
--- a/tests/startup-renderer.test.js
+++ b/tests/startup-renderer.test.js
@ -1,68 +0,0 @@
-const test = require('node:test');
-const assert = require('node:assert/strict');
-const { EventEmitter } = require('node:events');
-const { configureStartupRenderer, createStartupWindow } = require('../lib/startup-renderer');
-
-class TestBrowserWindow extends EventEmitter {
-  constructor(options) {
-    super();
-    this.options = options;
-    this.showCalls = 0;
-    this.startupEvents = [];
-    this.loadError = new Error('renderer load failed');
-  }
-
-  once(eventName, listener) {
-    this.startupEvents.push(`listen:${eventName}`);
-    return super.once(eventName, listener);
-  }
-
-  show() {
-    this.showCalls++;
-  }
-
-  loadFile(target) {
-    this.startupEvents.push(`load:${target}`);
-    return Promise.reject(this.loadError);
-  }
-}
-
-test('configureStartupRenderer disables hardware acceleration', () => {
-  let calls = 0;
-  configureStartupRenderer({ disableHardwareAcceleration() { calls++; } });
-  assert.equal(calls, 1);
-});
-
-test('createStartupWindow forces the main window to start hidden', () => {
-  const startup = createStartupWindow(TestBrowserWindow, { width: 1100, show: true });
-
-  assert.equal(startup.window.options.width, 1100);
-  assert.equal(startup.window.options.show, false);
-});
-
-test('startup load registers visibility before navigation and shows only once', async () => {
-  const startup = createStartupWindow(TestBrowserWindow, {});
-  const loading = startup.load('renderer/index.html', () => {});
-
-  assert.deepEqual(startup.window.startupEvents, [
-    'listen:ready-to-show',
-    'load:renderer/index.html'
-  ]);
-
-  startup.window.emit('ready-to-show');
-  startup.window.emit('ready-to-show');
-  await loading;
-
-  assert.equal(startup.window.showCalls, 1);
-});
-
-test('startup load forwards a rejected navigation to the error handler', async () => {
-  const startup = createStartupWindow(TestBrowserWindow, {});
-  let handledError;
-
-  await startup.load('renderer/index.html', (err) => {
-    handledError = err;
-  });
-
-  assert.equal(handledError, startup.window.loadError);
-});
--- a/tests/suspect-reject-alternates.test.js
+++ b/tests/suspect-reject-alternates.test.js
@ -26,20 +26,14 @@ describe('suspect-reject alternate accounts', () => {
    fileProbe.probeFileHead = (...a) => mockProbe(...a);

    const fs = require('fs');
-    const fakeSize = (p) => {
-      const m = /-(\d+)gb/i.exec(p);
-      return { size: (m ? parseInt(m[1], 10) : 3) * 1024 * 1024 * 1024 };
-    };
    const origStatSync = fs.statSync;
    fs.statSync = function (p) {
-      if (typeof p === 'string' && p.startsWith('/test/')) return fakeSize(p);
+      if (typeof p === 'string' && p.startsWith('/test/')) {
+        const m = /-(\d+)gb/i.exec(p);
+        return { size: (m ? parseInt(m[1], 10) : 3) * 1024 * 1024 * 1024 };
+      }
      return origStatSync.call(this, p);
    };
-    const origStat = fs.promises.stat;
-    fs.promises.stat = async function (p) {
-      if (typeof p === 'string' && p.startsWith('/test/')) return fakeSize(p);
-      return origStat.call(this, p);
-    };

    UploadManager = require('../lib/upload-manager');
  });
--- a/tests/ui-smoke.js
+++ b/tests/ui-smoke.js
@ -48,26 +48,20 @@ setTimeout(async () => {
    console.log('\\n=== Upload View ===');

    const tabCount = await wc.executeJavaScript('document.querySelectorAll(".tab").length');
-    check('4 tabs exist', tabCount === 4);
-
-    const tabLabels = await wc.executeJavaScript('[...document.querySelectorAll(".tab")].map(el => el.textContent.trim()).join("|")');
-    check('Current tab labels present', tabLabels === 'Upload|Accounts|Einstellungen|Verlauf');
-
-    const tabSemantics = await wc.executeJavaScript('document.querySelector(".tab-bar")?.getAttribute("role") + "|" + document.querySelector(".tab.active")?.getAttribute("aria-selected")');
-    check('Tab navigation exposes active state', tabSemantics === 'tablist|true');
+    check('3 tabs exist', tabCount === 3);

    const activeTab = await wc.executeJavaScript('document.querySelector(".tab.active")?.textContent?.trim()');
    check('Upload tab active by default', activeTab === 'Upload');

-    const tabStops = await wc.executeJavaScript('[...document.querySelectorAll(".tab")].map(el => el.tabIndex).join("|")');
-    check('Tab navigation exposes one keyboard stop', tabStops === '0|-1|-1|-1');
-
    const dropVisible = await wc.executeJavaScript('document.getElementById("dropZone")?.style.display !== "none"');
    check('Drop zone visible (no files)', dropVisible);

-    const queueHidden = await wc.executeJavaScript('document.getElementById("queueShell")?.style.display');
+    const queueHidden = await wc.executeJavaScript('document.getElementById("queueContainer")?.style.display');
    check('Queue hidden (no files)', queueHidden === 'none');

+    const chips = await wc.executeJavaScript('document.querySelectorAll(".hoster-chip").length');
+    check('4 hoster chips', chips === 4);
+
    const startDisabled = await wc.executeJavaScript('document.getElementById("startUploadBtn")?.disabled');
    check('Start button disabled initially', startDisabled === true);

@ -77,90 +71,9 @@ setTimeout(async () => {
    const version = await wc.executeJavaScript('document.getElementById("versionLabel")?.textContent');
    check('Version label present', version && version.startsWith('v'));

-    const localizedQueueHeaders = await wc.executeJavaScript('[...document.querySelectorAll("#queueTable thead th")].map(el => el.childNodes[0]?.textContent.trim()).join("|")');
-    check('Upload table labels are consistently German', localizedQueueHeaders === 'Dateiname|Hochgeladen / Größe|Hoster|Status|Zeit|Rest|Geschwindigkeit|Fortschritt');
-
-    const localizedRecentTabs = await wc.executeJavaScript('[...document.querySelectorAll(".recent-tab")].map(el => el.textContent.trim()).join("|")');
-    check('Recent panel labels are consistently German', localizedRecentTabs === 'Dateien|Statistik');
-
-    const localizedStatusbar = await wc.executeJavaScript('["sbConnections", "sbQueueCount", "sbRemainingCount", "sbInProgressCount", "sbDoneCount", "sbErrorCount"].map(id => document.getElementById(id)?.textContent).join("|")');
-    check('Statusbar labels are consistently German', localizedStatusbar === 'Verbindungen 0|Gesamt 0|Verbleibend 0|Läuft 0|Fertig 0|Fehler 0');
-
-    const toolbarLabels = await wc.executeJavaScript('[...document.querySelectorAll("#queueCommandBar .toolbar-btn")].map(el => el.getAttribute("aria-label")).join("|")');
-    check('Upload toolbar actions have German accessible names', toolbarLabels === 'Alle Uploads starten|Ausgewählte Uploads starten|Ausgewählte Datei erneut hochladen|Ausgewählten Upload abbrechen|Aktive Uploads beenden und stoppen|Alle Uploads abbrechen|Ganz nach oben|Nach oben|Nach unten|Ganz nach unten');
-
-    const keyboardTab = await wc.executeJavaScript('document.getElementById("upload-tab").focus(); document.getElementById("upload-tab").dispatchEvent(new KeyboardEvent("keydown", { key: "ArrowRight", bubbles: true })); document.querySelector(".tab.active")?.textContent?.trim() + "|" + document.activeElement?.id');
-    check('Arrow keys move and activate main tabs', keyboardTab === 'Accounts|accounts-tab');
-
    const ctxHidden = await wc.executeJavaScript('document.getElementById("contextMenu")?.style.display');
    check('Context menu hidden', ctxHidden === 'none');

-    console.log('\\n=== Accounts View ===');
-
-    await wc.executeJavaScript('document.querySelector(".tab[data-view=\\'accounts\\']").click()');
-    await new Promise(r => setTimeout(r, 300));
-
-    const accountsActive = await wc.executeJavaScript('document.getElementById("accounts-view")?.classList.contains("active")');
-    check('Accounts tab active', accountsActive);
-
-    const accountListValid = await wc.executeJavaScript('Boolean(document.querySelector("#accountsList .accounts-empty") || document.querySelectorAll("#accountsList .account-hoster-group").length)');
-    check('Account manager list structure rendered', accountListValid);
-
-    const addAccountEnabled = await wc.executeJavaScript('document.getElementById("addAccountBtn")?.disabled === false');
-    check('Add account button enabled', addAccountEnabled);
-
-    const emptyAccountAction = await wc.executeJavaScript('document.querySelector("[data-account-empty-add]")?.textContent?.trim()');
-    check('Empty account state offers direct action', emptyAccountAction === 'Ersten Account hinzufügen');
-
-    await wc.executeJavaScript('document.querySelector("[data-account-empty-add]").focus(); document.querySelector("[data-account-empty-add]").click()');
-    await new Promise(r => setTimeout(r, 200));
-
-    const accountModalVisible = await wc.executeJavaScript('document.getElementById("accountModal")?.style.display');
-    check('Account modal opens', accountModalVisible === 'flex');
-
-    const accountModalTitle = await wc.executeJavaScript('document.getElementById("accountModalTitle")?.textContent');
-    check('Account modal is in add mode', accountModalTitle === 'Account hinzufügen');
-
-    const accountModalSemantics = await wc.executeJavaScript('document.querySelector("#accountModal .modal-card")?.getAttribute("role") + "|" + document.querySelector("#accountModal .modal-card")?.getAttribute("aria-modal")');
-    check('Account modal exposes dialog semantics', accountModalSemantics === 'dialog|true');
-
-    const accountFormLabels = await wc.executeJavaScript('["accountHosterSelect", "accField_label", "accField_username", "accField_password"].every(id => document.getElementById(id)?.labels?.length === 1)');
-    check('Account form controls have linked labels', accountFormLabels);
-
-    const accountStatusLive = await wc.executeJavaScript('document.getElementById("accountModalStatus")?.getAttribute("aria-live")');
-    check('Account validation status is announced', accountStatusLive === 'polite');
-
-    const initialAccountFocus = await wc.executeJavaScript('document.activeElement?.id');
-    check('Account modal focuses first control', initialAccountFocus === 'accountHosterSelect');
-
-    const trappedAccountFocus = await wc.executeJavaScript('document.getElementById("saveAccountBtn").focus(); document.dispatchEvent(new KeyboardEvent("keydown", { key: "Tab", bubbles: true })); document.activeElement?.id');
-    check('Account modal keeps keyboard focus inside', trappedAccountFocus === 'closeAccountModalBtn');
-
-    const authOptionCount = await wc.executeJavaScript('document.querySelectorAll("#accountHosterSelect option").length');
-    check('7 hoster authentication options exist', authOptionCount === 7);
-
-    const hosterCount = await wc.executeJavaScript('[...new Set([...document.querySelectorAll("#accountHosterSelect option")].map(el => el.value.split(":")[0]))].length');
-    check('5 hosters exist', hosterCount === 5);
-
-    const accountSubmitLabel = await wc.executeJavaScript('document.getElementById("saveAccountBtn")?.textContent');
-    check('Account submit label is Prüfen und anlegen', accountSubmitLabel === 'Prüfen und anlegen');
-
-    const credentialInputs = await wc.executeJavaScript('document.querySelectorAll("#accountCredsFields .key-input").length');
-    check('Credential inputs rendered', credentialInputs === 2);
-
-    const passwordToggleState = await wc.executeJavaScript('document.querySelector("#accountCredsFields .toggle-vis").click(); document.querySelector("#accountCredsFields .toggle-vis").getAttribute("aria-label") + "|" + document.querySelector("#accountCredsFields .toggle-vis").getAttribute("aria-pressed")');
-    check('Password visibility action exposes its state', passwordToggleState === 'Passwort verbergen|true');
-
-    await wc.executeJavaScript('document.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape", bubbles: true }))');
-    const accountModalHidden = await wc.executeJavaScript('document.getElementById("accountModal")?.style.display');
-    check('Escape closes account modal', accountModalHidden === 'none');
-
-    const restoredAccountFocus = await wc.executeJavaScript('document.activeElement?.hasAttribute("data-account-empty-add")');
-    check('Account modal restores trigger focus', restoredAccountFocus === true);
-
-    const fallbackAccountFocus = await wc.executeJavaScript('document.querySelector("[data-account-empty-add]").focus(); document.querySelector("[data-account-empty-add]").click(); document.querySelector("[data-account-empty-add]").remove(); document.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape", bubbles: true })); document.activeElement?.id');
-    check('Account modal restores stable focus after list rerender', fallbackAccountFocus === 'addAccountBtn');
-
    console.log('\\n=== Settings View ===');

    await wc.executeJavaScript('document.querySelector(".tab[data-view=\\'settings\\']").click()');
@ -169,14 +82,23 @@ setTimeout(async () => {
    const settingsActive = await wc.executeJavaScript('document.getElementById("settings-view")?.classList.contains("active")');
    check('Settings tab active', settingsActive);

-    const settingsSubtabs = await wc.executeJavaScript('document.querySelectorAll(".settings-subtab").length');
-    check('6 settings subtabs exist', settingsSubtabs === 6);
+    const panels = await wc.executeJavaScript('document.querySelectorAll(".hoster-settings-panel").length');
+    check('4 hoster panels', panels === 4);

-    const accountSettingsPointer = await wc.executeJavaScript('document.querySelector(".settings-hoster-pointer")?.textContent');
-    check('Hoster settings point to Accounts tab', accountSettingsPointer && accountSettingsPointer.includes('Accounts'));
+    const hsInputCount = await wc.executeJavaScript('document.querySelectorAll(".hs-input").length');
+    check('24 per-hoster inputs (6x4)', hsInputCount === 24);

-    const parallel = await wc.executeJavaScript('document.getElementById("parallelUploadCountInput")?.value');
-    check('Global parallel uploads default 0', parallel === '0');
+    await wc.executeJavaScript('document.querySelector(".hoster-panel-header").click()');
+    await new Promise(r => setTimeout(r, 200));
+
+    const panelBody = await wc.executeJavaScript('document.querySelector(".hoster-panel-body").style.display');
+    check('Panel expands on click', panelBody !== 'none');
+
+    const retries = await wc.executeJavaScript('document.querySelector(".hs-input[data-hs=\\'retries\\']")?.value');
+    check('Retries default 3', retries === '3');
+
+    const parallel = await wc.executeJavaScript('document.querySelector(".hs-input[data-hs=\\'parallelCount\\']")?.value');
+    check('ParallelCount default 2', parallel === '2');

    // Test save
    await wc.executeJavaScript('document.getElementById("saveSettingsBtn").click()');
@ -215,7 +137,8 @@ setTimeout(async () => {
  results.forEach(r => console.log(r));
  console.log('\\nTotal: ' + (passed + failed) + ' | Passed: ' + passed + ' | Failed: ' + failed);

-  app.exit(failed > 0 ? 1 : 0);
+  if (failed > 0) process.exitCode = 1;
+  app.quit();
 }, 5000);
 `;

@ -243,7 +166,9 @@ try {
      .join('\n');
    if (filtered.trim()) console.error(filtered);
  }
-  process.exitCode = Number.isInteger(err.status) && err.status !== 0 ? err.status : 1;
+  if (err.status && err.status !== 0 && !err.killed) {
+    process.exit(err.status);
+  }
 } finally {
  try { fs.unlinkSync(injectPath); } catch {}
 }
--- a/tests/updater-version.test.js
+++ b/tests/updater-version.test.js
@ -1,98 +0,0 @@
-const test = require('node:test');
-const assert = require('node:assert/strict');
-const path = require('node:path');
-const { spawnSync } = require('node:child_process');
-const { pathToFileURL } = require('node:url');
-
-const { isNewer, resolveReleaseVersion } = require('../lib/updater');
-
-test('bridge title resolves product version instead of transport tag', () => {
-  assert.equal(resolveReleaseVersion({ name: 'Multi-Hoster-Upload v2.0.1', tag_name: 'v3.3.109' }), '2.0.1');
-  assert.equal(isNewer('2.0.1', '2.0.1'), false);
-  assert.equal(isNewer('2.0.2', '2.0.1'), true);
-});
-
-test('release CLI rejects a malformed transport tag before release work', () => {
-  const script = path.resolve(__dirname, '../scripts/release_gitea.mjs');
-  const result = spawnSync(process.execPath, [script, '2.0.1', '--transport-tag', '3.3.109', 'Bridge', '--dry-run'], {
-    cwd: path.resolve(__dirname, '..'),
-    encoding: 'utf8'
-  });
-
-  assert.equal(result.status, 1);
-  assert.match(result.stderr, /--transport-tag must match vX\.Y\.Z/);
-  assert.doesNotMatch(result.stdout, /npm run release:win/);
-});
-
-test('release plan keeps product artifacts separate from the transport tag', () => {
-  const script = path.resolve(__dirname, '../scripts/release_gitea.mjs');
-  const moduleUrl = pathToFileURL(script).href;
-  const source = `
-    import { createReleasePlan, parseReleaseArgs, renderLatestYml } from ${JSON.stringify(moduleUrl)};
-    const plan = createReleasePlan(parseReleaseArgs(['2.0.1', '--transport-tag', 'v3.3.109', 'Bridge', 'notes']));
-    const latestYml = renderLatestYml(plan, 'abc123', 456, '2026-08-07T12:00:00.000Z');
-    process.stdout.write(JSON.stringify({
-      version: plan.version,
-      transportTag: plan.transportTag,
-      releaseTitle: plan.releaseTitle,
-      releaseBody: plan.releaseBody,
-      expectedArtifacts: plan.expectedArtifacts,
-      latestYml
-    }));
-  `;
-  const result = spawnSync(process.execPath, ['--input-type=module', '--eval', source], {
-    cwd: path.resolve(__dirname, '..'),
-    encoding: 'utf8'
-  });
-
-  assert.equal(result.status, 0, result.stderr);
-  assert.deepEqual(JSON.parse(result.stdout), {
-    version: '2.0.1',
-    transportTag: 'v3.3.109',
-    releaseTitle: 'Multi-Hoster-Upload v2.0.1',
-    releaseBody: 'Bridge notes',
-    expectedArtifacts: [
-      'Multi-Hoster-Upload Setup 2.0.1.exe',
-      'Multi-Hoster-Upload 2.0.1.exe',
-      'latest.yml'
-    ],
-    latestYml: "version: 2.0.1\nfiles:\n  - url: Multi-Hoster-Upload Setup 2.0.1.exe\n    sha512: abc123\n    size: 456\npath: Multi-Hoster-Upload Setup 2.0.1.exe\nsha512: abc123\nreleaseDate: '2026-08-07T12:00:00.000Z'\n"
-  });
-});
-
-test('compatible existing release preserves the recovery id', async () => {
-  const moduleUrl = pathToFileURL(path.resolve(__dirname, '../scripts/release_gitea.mjs')).href;
-  const { createReleasePlan, parseReleaseArgs, resolveExistingReleaseId } = await import(moduleUrl);
-  const plan = createReleasePlan(parseReleaseArgs(['2.0.1', '--transport-tag', 'v3.3.109', 'Bridge notes']));
-  const release = {
-    id: 81,
-    tag_name: 'v3.3.109',
-    name: 'Multi-Hoster-Upload v2.0.1',
-    body: 'Bridge notes',
-    draft: false,
-    prerelease: false,
-    assets: []
-  };
-
-  assert.equal(resolveExistingReleaseId(plan, release), 81);
-});
-
-test('incompatible existing release title fails closed', async () => {
-  const moduleUrl = pathToFileURL(path.resolve(__dirname, '../scripts/release_gitea.mjs')).href;
-  const { createReleasePlan, parseReleaseArgs, resolveExistingReleaseId } = await import(moduleUrl);
-  const plan = createReleasePlan(parseReleaseArgs(['2.0.1', '--transport-tag', 'v3.3.109', 'Bridge notes']));
-  const release = {
-    id: 81,
-    tag_name: 'v3.3.109',
-    name: 'Multi-Hoster-Upload v3.3.109',
-    body: 'Old transport release',
-    draft: false,
-    prerelease: false,
-    assets: []
-  };
-
-  assert.throws(
-    () => resolveExistingReleaseId(plan, release),
-    /Refusing recovery for v3\.3\.109: existing release title "Multi-Hoster-Upload v3\.3\.109" does not match "Multi-Hoster-Upload v2\.0\.1"/
-  );
-});
--- a/tests/upload-manager.test.js
+++ b/tests/upload-manager.test.js
@ -33,7 +33,7 @@ describe('UploadManager', () => {
    hosters.uploadFile = mockUploadFile;
    hosters.prefetchBaseline = async () => null;

-    // Mock fs.statSync + fs.promises.stat for test file paths
+    // Mock fs.statSync for test file paths
    const fs = require('fs');
    const origStatSync = fs.statSync;
    fs.statSync = function(p) {
@ -42,13 +42,6 @@ describe('UploadManager', () => {
      }
      return origStatSync.call(this, p);
    };
-    const origStat = fs.promises.stat;
-    fs.promises.stat = async function(p) {
-      if (typeof p === 'string' && p.startsWith('/test/')) {
-        return { size: fakeFileSize };
-      }
-      return origStat.call(this, p);
-    };

    UploadManager = require('../lib/upload-manager');
  });
@ -338,10 +331,10 @@ describe('UploadManager', () => {
  });

  it('file not found produces descriptive error', async () => {
-    // Override fs.promises.stat to throw ENOENT for a specific path
+    // Override fs.statSync to throw ENOENT for a specific path
    const fs = require('fs');
-    const origStat = fs.promises.stat;
-    fs.promises.stat = async function(p) {
+    const origStat = fs.statSync;
+    fs.statSync = function(p) {
      if (p === '/test/deleted.mp4') throw Object.assign(new Error('ENOENT'), { code: 'ENOENT' });
      return origStat.call(this, p);
    };
@ -354,7 +347,7 @@ describe('UploadManager', () => {
      { file: '/test/deleted.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

-    fs.promises.stat = origStat;
+    fs.statSync = origStat;
    assert.ok(errors.some(e => e.includes('nicht gefunden')), `expected "nicht gefunden" error, got: ${errors.join(', ')}`);
  });

--- a/tests/validate-credentials.test.js
+++ b/tests/validate-credentials.test.js
@ -1,208 +1,195 @@
+// Pure unit tests for the validate-credentials shape contract — does NOT spin
+// up Electron or the real per-hoster checkers. Those need network. We verify
+// the SHAPE the ephemeral hosterConfig is built into (which the per-hoster
+// checkers consume) plus the snapshot-key/invalidation invariants that the
+// renderer relies on to enforce "validated creds only".
+//
+// The three assertions the advisor called out as the regression guard for the
+// user's "mehrfach angelegt" complaint:
+//   (a) failed validation persists nothing to config.hosters
+//   (b) a second "Anlegen" click with the guard set persists exactly one entry
+//   (c) OTP-required path persists nothing
+// are exercised at the state-machine level by simulating the renderer's logic
+// (re-implemented here as pure functions for testability — the real ones live
+// in renderer/app.js which can't run under node:test).
+
 const { test } = require('node:test');
-const assert = require('node:assert/strict');
-const {
-  createAccountSubmitter,
-  getAccountSubmitLabel,
-  submitValidatedAccount
-} = require('../renderer/account-submit');
+const assert = require('node:assert');

-test('account submit labels stay exact for add, edit, and OTP retries', () => {
-  assert.equal(getAccountSubmitLabel({ isEdit: false, hasOtp: false }), 'Prüfen und anlegen');
-  assert.equal(getAccountSubmitLabel({ isEdit: true, hasOtp: false }), 'Prüfen und speichern');
-  assert.equal(getAccountSubmitLabel({ isEdit: false, hasOtp: true }), 'Prüfen und anlegen');
-  assert.equal(getAccountSubmitLabel({ isEdit: true, hasOtp: true }), 'Prüfen und speichern');
-});
+// ---- Re-implementations of the renderer's pure helpers ----
+// These mirror the production code exactly so the tests serve as both a guard
+// and executable spec for what saveAccount() must do.

-test('close and reopen cannot start a second save while the first save is pending', async () => {
-  const submitter = createAccountSubmitter();
-  let current = true;
-  let commits = 0;
-  let applies = 0;
-  let saveStarted;
-  let finishSave;
-  const started = new Promise(resolve => { saveStarted = resolve; });
-  const saving = new Promise(resolve => { finishSave = resolve; });
-  const first = submitter.submit({
-    validate: async () => ({ status: 'ok' }),
-    commit: async () => {
-      commits++;
-      saveStarted();
-      await saving;
-      return { accountId: 'first' };
-    },
-    afterCommit: async () => {
-      applies++;
-    },
-    isCurrent: () => current
-  });
-
-  await started;
-  current = false;
-  const second = submitter.submit({
-    validate: async () => ({ status: 'ok' }),
-    commit: async () => {
-      commits++;
-    },
-    isCurrent: () => true
-  });
-
-  assert.equal(second, null);
-  assert.equal(submitter.isBusy(), true);
-  finishSave();
-  const result = await first;
-
-  assert.equal(result.status, 'stale');
-  assert.equal(result.committed, true);
-  assert.equal(commits, 1);
-  assert.equal(applies, 1);
-  assert.equal(submitter.isBusy(), false);
-});
-
-test('post-save apply failure remains committed and cannot invite a duplicate retry', async () => {
-  const expected = new Error('render failed');
-  let saves = 0;
-  let applies = 0;
-  const result = await submitValidatedAccount({
-    validate: async () => ({ status: 'ok' }),
-    commit: async () => {
-      saves++;
-      return { accountId: 'saved-account' };
-    },
-    afterCommit: async () => {
-      applies++;
-      throw expected;
-    },
-    isCurrent: () => true
-  });
-
-  assert.equal(result.status, 'committed');
-  assert.equal(result.value.accountId, 'saved-account');
-  assert.equal(result.postCommitError, expected);
-  assert.equal(saves, 1);
-  assert.equal(applies, 1);
-});
-
-test('ok validates and commits exactly once in one submission', async () => {
-  let validations = 0;
-  let commits = 0;
-  const result = await submitValidatedAccount({
-    validate: async () => {
-      validations++;
-      return { status: 'ok', message: 'Login erfolgreich' };
-    },
-    commit: async () => {
-      commits++;
-    },
-    isCurrent: () => true
-  });
-
-  assert.equal(result.status, 'committed');
-  assert.equal(validations, 1);
-  assert.equal(commits, 1);
-});
-
-test('warn validates and commits exactly once in one submission', async () => {
-  let commits = 0;
-  const validation = { status: 'warn', message: 'Login mit Warnung' };
-  const result = await submitValidatedAccount({
-    validate: async () => validation,
-    commit: async (received) => {
-      commits++;
-      assert.equal(received, validation);
-    },
-    isCurrent: () => true
-  });
-
-  assert.equal(result.status, 'committed');
-  assert.equal(result.validation, validation);
-  assert.equal(commits, 1);
-});
-
-for (const status of ['error', 'skipped']) {
-  test(`${status} rejects without committing`, async () => {
-    let commits = 0;
-    const validation = { status, message: `${status} result` };
-    const result = await submitValidatedAccount({
-      validate: async () => validation,
-      commit: async () => {
-        commits++;
-      },
-      isCurrent: () => true
-    });
-
-    assert.equal(result.status, 'rejected');
-    assert.equal(result.validation, validation);
-    assert.equal(commits, 0);
-  });
+function credsSnapshotKey(authType, creds) {
+  if (authType === 'login') return `login:${creds.username || ''}:${creds.password || ''}`;
+  return `api:${creds.apiKey || ''}`;
 }

-test('validate throw returns error without committing', async () => {
-  const expected = new Error('validation failed');
-  let commits = 0;
-  const result = await submitValidatedAccount({
-    validate: async () => {
-      throw expected;
-    },
-    commit: async () => {
-      commits++;
-    },
-    isCurrent: () => true
-  });
+function buildEphemeralHosterConfig(payload) {
+  return {
+    username: payload.username || '',
+    password: payload.password || '',
+    apiKey: payload.apiKey || '',
+    enabled: true
+  };
+}

-  assert.equal(result.status, 'error');
-  assert.equal(result.error, expected);
-  assert.equal(commits, 0);
+// State-machine simulator that mirrors saveAccount() WITHOUT DOM/IPC.
+function makeStateMachine({ validateImpl, persistImpl }) {
+  let busy = false;
+  let validated = null; // { hosterName, authType, snapshot, status }
+  const log = []; // log of every persist call, for assertions
+
+  async function click(ctx, creds, otp = '') {
+    if (busy) { log.push({ type: 'click-ignored-busy' }); return; }
+    const snapshot = credsSnapshotKey(ctx.authType, creds);
+
+    // STEP 2: commit if validated matches.
+    if (validated &&
+        validated.hosterName === ctx.hosterName &&
+        validated.authType === ctx.authType &&
+        validated.snapshot === snapshot) {
+      busy = true;
+      try {
+        await persistImpl(ctx, creds);
+        log.push({ type: 'persisted', accountId: ctx.accountId || `${ctx.hosterName}-NEW` });
+      } finally { busy = false; }
+      return;
+    }
+
+    // STEP 1: ephemeral validate.
+    busy = true;
+    let row;
+    try {
+      row = await validateImpl({ hoster: ctx.hosterName, authType: ctx.authType, ...creds, otp });
+    } finally { busy = false; }
+    if (row && (row.status === 'ok' || row.status === 'warn')) {
+      validated = { hosterName: ctx.hosterName, authType: ctx.authType, snapshot, status: row.status };
+      log.push({ type: 'validated', status: row.status });
+      return;
+    }
+    if (row && row.status === 'otp_required') {
+      log.push({ type: 'otp-required' });
+      return;
+    }
+    log.push({ type: 'validation-failed', message: row && row.message });
+  }
+
+  function editField() { validated = null; log.push({ type: 'invalidated-by-edit' }); }
+  return { click, editField, log: () => log.slice(), getValidated: () => validated };
+}
+
+// ---- Tests ----
+
+test('regression (a): failed validation persists NOTHING to config.hosters', async () => {
+  const persistCalls = [];
+  const sm = makeStateMachine({
+    validateImpl: async () => ({ status: 'error', message: 'Falsches Passwort' }),
+    persistImpl: async (ctx, creds) => persistCalls.push({ ctx, creds })
+  });
+  await sm.click({ hosterName: 'doodstream.com', authType: 'login', isEdit: false }, { username: 'u', password: 'wrong' });
+  assert.equal(persistCalls.length, 0, 'no persist should happen on failed validation');
+  assert.equal(sm.getValidated(), null);
+  assert.deepEqual(sm.log().map(e => e.type), ['validation-failed']);
 });

-test('otp_required returns challenge without committing', async () => {
-  let commits = 0;
-  const validation = { status: 'otp_required', message: 'OTP gesendet' };
-  const result = await submitValidatedAccount({
-    validate: async () => validation,
-    commit: async () => {
-      commits++;
-    },
-    isCurrent: () => true
+test('regression (b): second click with guard set persists exactly ONE entry — no duplication', async () => {
+  const persistCalls = [];
+  let validateCount = 0;
+  const sm = makeStateMachine({
+    validateImpl: async () => { validateCount++; return { status: 'ok' }; },
+    persistImpl: async (ctx, creds) => persistCalls.push({ ctx, creds })
  });
+  const ctx = { hosterName: 'doodstream.com', authType: 'login', isEdit: false };
+  const creds = { username: 'u', password: 'p' };
+  // Click 1 = validate → green.
+  await sm.click(ctx, creds);
+  // Click 2 = commit (same creds, validated snapshot matches).
+  await sm.click(ctx, creds);
+  // Click 3 = guard prevents a second commit because after persistImpl the
+  // state-machine in real code closes the modal. In this simulator the
+  // validated snapshot is still set — but a real double-click WHILE persistImpl
+  // is in flight would be caught by busy. Simulate that:
+  const sm2 = makeStateMachine({
+    validateImpl: async () => ({ status: 'ok' }),
+    persistImpl: () => new Promise(r => setTimeout(() => { persistCalls.push('slow'); r(); }, 30))
+  });
+  await sm2.click(ctx, creds); // validate
+  const p1 = sm2.click(ctx, creds); // start commit
+  const p2 = sm2.click(ctx, creds); // racing click — must be ignored
+  await Promise.all([p1, p2]);

-  assert.equal(result.status, 'otp_required');
-  assert.equal(result.validation, validation);
-  assert.equal(commits, 0);
+  assert.equal(persistCalls.length, 2, 'one persist from the deliberate two-step flow + one from sm2; racing click ignored');
+  assert.equal(validateCount, 1, 'second click reused the validated snapshot — no re-validate');
+  // The racing click MUST have been ignored by the busy guard.
+  assert.ok(sm2.log().some(e => e.type === 'click-ignored-busy'), 'busy guard fired on racing click');
 });

-test('stale submission is rejected immediately before commit', async () => {
-  let current = true;
-  let commits = 0;
-  const validation = { status: 'ok' };
-  const result = await submitValidatedAccount({
-    validate: async () => {
-      current = false;
-      return validation;
+test('regression (c): OTP-required persists NOTHING — and a follow-up click with OTP re-validates ephemerally', async () => {
+  const persistCalls = [];
+  let calls = 0;
+  const sm = makeStateMachine({
+    validateImpl: async (payload) => {
+      calls++;
+      if (!payload.otp) return { status: 'otp_required', message: 'OTP sent' };
+      if (payload.otp === '123456') return { status: 'ok' };
+      return { status: 'error', message: 'Bad OTP' };
    },
-    commit: async () => {
-      commits++;
-    },
-    isCurrent: () => current
+    persistImpl: async (ctx, creds) => persistCalls.push({ ctx, creds })
  });
-
-  assert.equal(result.status, 'stale');
-  assert.equal(result.validation, validation);
-  assert.equal(commits, 0);
+  const ctx = { hosterName: 'doodstream.com', authType: 'login', isEdit: false };
+  const creds = { username: 'u', password: 'p' };
+  await sm.click(ctx, creds, '');         // first click → otp_required
+  await sm.click(ctx, creds, '123456');   // retry with otp → ok
+  await sm.click(ctx, creds);             // final click → commit
+  assert.equal(persistCalls.length, 1, 'exactly one persist after OTP confirmed');
+  assert.equal(calls, 2, 'validate ran twice (initial + OTP) before commit');
+  assert.deepEqual(
+    sm.log().map(e => e.type),
+    ['otp-required', 'validated', 'persisted']
+  );
 });

-test('save failure returns error after one commit attempt', async () => {
-  const expected = new Error('save failed');
-  let commits = 0;
-  const result = await submitValidatedAccount({
-    validate: async () => ({ status: 'ok' }),
-    commit: async () => {
-      commits++;
-      throw expected;
-    },
-    isCurrent: () => true
+test('field edit after green check invalidates the snapshot — next click is a re-Prüfen, not a commit', async () => {
+  const persistCalls = [];
+  let validateCount = 0;
+  const sm = makeStateMachine({
+    validateImpl: async () => { validateCount++; return { status: 'ok' }; },
+    persistImpl: async (ctx, creds) => persistCalls.push({ ctx, creds })
  });
-
-  assert.equal(result.status, 'error');
-  assert.equal(result.error, expected);
-  assert.equal(commits, 1);
+  const ctx = { hosterName: 'doodstream.com', authType: 'login', isEdit: false };
+  await sm.click(ctx, { username: 'u', password: 'p' });   // validate → green
+  sm.editField();                                           // user edits cred field → snapshot dropped
+  await sm.click(ctx, { username: 'u', password: 'newpw' }); // creds differ → re-validate
+  await sm.click(ctx, { username: 'u', password: 'newpw' }); // now commit the NEW creds
+  assert.equal(persistCalls.length, 1, 'one persist of the new (re-validated) creds');
+  assert.equal(persistCalls[0].creds.password, 'newpw', 'persisted creds match the re-validated set');
+  assert.equal(validateCount, 2, 'second validate was forced by the edit-induced invalidation');
+});
+
+test('snapshot key is identical for same creds and DIFFERENT for any cred change (excluding label)', () => {
+  // Label changes must NOT invalidate validation — label is metadata, not a credential.
+  assert.equal(credsSnapshotKey('login', { username: 'u', password: 'p' }),
+               credsSnapshotKey('login', { username: 'u', password: 'p', label: 'XYZ' }));
+  assert.notEqual(credsSnapshotKey('login', { username: 'u', password: 'p' }),
+                  credsSnapshotKey('login', { username: 'u', password: 'P' })); // password char-case
+  assert.notEqual(credsSnapshotKey('login', { username: 'u', password: 'p' }),
+                  credsSnapshotKey('login', { username: 'U', password: 'p' })); // username diff
+  assert.equal(credsSnapshotKey('api', { apiKey: 'KEY' }),
+               credsSnapshotKey('api', { apiKey: 'KEY', label: 'mein key' }));
+  assert.notEqual(credsSnapshotKey('api', { apiKey: 'KEY' }),
+                  credsSnapshotKey('api', { apiKey: 'KEY2' }));
+});
+
+test('ephemeral hosterConfig shape matches what per-hoster checkers expect', () => {
+  // The per-hoster checkers in main.js read .username/.password/.apiKey directly.
+  // This guards the validate-credentials IPC contract from drifting.
+  const cfg = buildEphemeralHosterConfig({ hoster: 'doodstream.com', username: 'u', password: 'p' });
+  assert.equal(cfg.username, 'u');
+  assert.equal(cfg.password, 'p');
+  assert.equal(cfg.apiKey, '');
+  assert.equal(cfg.enabled, true);
+  const cfg2 = buildEphemeralHosterConfig({ hoster: 'byse.sx', apiKey: 'K' });
+  assert.equal(cfg2.apiKey, 'K');
+  assert.equal(cfg2.username, '');
 });