Release v1.7.232

Nutzer-Report (ultracode-Diagnose, 6-Agenten): ein Item mit "Fehler: HTTP 416"
(Range Not Satisfiable) wurde gar nicht mehr erneut versucht und blockierte das
ganze Paket ("Entpacken - Ausstehend" bei allen fertigen Geschwistern). Befund
code-belegt: nach dem In-Run-416-Budget (maxHttp416Retries) lief das Item in
einen Endzustand:
- retryLimit>0 (bare "HTTP 416", directLinkRetryMatch=false): direkt terminal
  "failed" (download-manager ~9442). Der einzige Re-Retry-Pfad
  recoverRetryableItems() laeuft NUR bei Boot/Start, nie mid-run -> mit
  autoReconnect=false bleibt es bis zum Neustart "failed". Und da jeder
  Extract-Zweig auf failed===0 gated, friert EIN failed-Item das ganze Paket
  ein -> exakt das Screenshot-Symptom.
- retryLimit=0 (wrapped "direct_link_retry_exhausted:HTTP 416"): faellt nach dem
  416-Budget in den generischen Retry (9349) mit maxGenericErrorRetries=
  MAX_SAFE_INTEGER -> unbegrenzte futile Re-Unrestricts (haemmert den Hoster,
  Item kommt nie weiter).

Fix: bei erschoepftem 416-Budget an BEIDEN Stellen (gewrappt @9320, bare @9442)
nicht mehr terminalisieren bzw. endlos generisch retrien, sondern via neuem
escalateHttp416OrFail() einen kompletten Neu-Download von 0 anstossen: Partial
loeschen (rmSync), Bytes/Progress/Budget zuruecksetzen, mit Delay re-queuen. Da
416 ein abgelehnter Resume-Range ist, ist der korrekte Weg ein frischer
Download ohne Range-Header (kein 416 mehr) statt erneuter Resume. Hart gedeckelt
ueber http416FreshRestartByItem (MAX_HTTP416_FRESH_RESTARTS=2, retryLimit-
unabhaengig) -> ein wirklich toter Link faellt nach begrenzten sauberen
Neustarts terminal, kein Endlos-Hammering. Zaehler wird in start() und beim
terminalen Fail geleert. Fresh-Restart-Delay via RD_HTTP416_FRESH_RESTART_DELAY_MS
testbar.

Sobald das Item den failed-Zustand verlaesst, entsperrt die bestehende
failed===0-Logik das Paket-Entpacken von selbst. (Die optionale Haertung
"fertige Archiv-Sets trotz failed-Geschwister entpacken" + "Voll-Datei-416 als
fertig werten statt neu laden" sind bewusst als Folgeschritt offen.)

Tests: Recovery (416 erschoepft -> Clean-Restart -> Item completed, retryLimit>0
bare) + Bounded-Fail (persistentes 416 -> begrenzte Neustarts -> failed,
retryLimit=0 wrapped, terminiert statt Endlos). Suite 945 gruen, tsc=6.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "real-debrid-downloader",
-  "version": "1.7.216",
+  "version": "1.7.232",
   "description": "Desktop downloader",
   "main": "build/main/main/main.js",
   "author": "Sucukdeluxe",

src/main/app-controller.ts

@@ -1,4 +1,5 @@
 import path from "node:path";
+import os from "node:os";
 import v8 from "node:v8";
 import { app } from "electron";
 import { getDebridLinkApiKeyIds } from "../shared/debrid-link-keys";
@@ -9,9 +10,11 @@ import {
   DebridAccountStatus,
   DebridProvider,
   DuplicatePolicy,
+  EnableRemoteDiagnosticsInput,
   HistoryEntry,
   PackagePriority,
   ParsedPackageInput,
+  RemoteDiagnosticsInfo,
   SessionStats,
   StartConflictEntry,
   StartConflictResolutionResult,
@@ -36,11 +39,13 @@ import { getItemLogPath, initItemLogs, shutdownItemLogs } from "./item-log";
 import { getPackageLogPath, initPackageLogs, shutdownPackageLogs } from "./package-log";
 import { initSessionLog, getSessionLogPath, shutdownSessionLog } from "./session-log";
 import { MegaWebFallback } from "./mega-web-fallback";
-import { addHistoryEntry, addHistoryEntryForRetention, cancelPendingAsyncSaves, clearHistory, createStoragePaths, loadHistory, loadHistoryForRetention, loadSession, loadSettings, normalizeHistoryEntry, normalizeLoadedSession, normalizeLoadedSessionTransientFields, normalizeSettings, removeHistoryEntry, resetHistoryForRetention, saveHistory, saveSession, saveSettings } from "./storage";
+import { addHistoryEntry, addHistoryEntryForRetention, cancelPendingAsyncSaves, clearHistory, createStoragePaths, loadHistory, loadHistoryForRetention, loadSessionWithStatus, loadSettings, normalizeHistoryEntry, normalizeLoadedSession, normalizeLoadedSessionTransientFields, normalizeSettings, removeHistoryEntry, resetHistoryForRetention, saveHistory, saveSession, saveSettings } from "./storage";
 import { abortActiveUpdateDownload, checkGitHubUpdate, installLatestUpdate } from "./update";
-import { rotateDebugToken, startDebugServer, stopDebugServer } from "./debug-server";
+import { runInstallWithResume } from "./update-install-flow";
+import { rotateDebugToken, startDebugServer, stopDebugServer, restartDebugServer, getDebugServerRuntimeStatus, getActiveDebugToken, getDebugAllowlist, writeDebugServerConfig, clearDebugToken } from "./debug-server";
+import { encodeConnectionCode, loadRemoteMeta, saveRemoteMeta } from "./connection-code";
 import { encryptBackup, decryptBackup } from "./backup-crypto";
-import { buildBackupPayload, planBackupImport } from "./backup-payload";
+import { buildBackupPayload, planBackupImport, resolveMcpRemoteRestore, BackupMcpRemote } from "./backup-payload";
 import { getAuditLogPath, initAuditLog, logAuditEvent, shutdownAuditLog } from "./audit-log";
 import { initAccountRotationLog, shutdownAccountRotationLog } from "./account-rotation-log";
 import { initConversionLog, shutdownConversionLog } from "./conversion-trace";
@@ -107,7 +112,8 @@ export class AppController {
     initTraceLog(this.storagePaths.baseDir);
     this.settings = loadSettings(this.storagePaths);
     resetHistoryForRetention(this.storagePaths, this.settings.historyRetentionMode);
-    const session = loadSession(this.storagePaths);
+    const loadResult = loadSessionWithStatus(this.storagePaths);
+    const session = loadResult.session;
     this.megaWebFallback = new MegaWebFallback(() => ({
       login: this.settings.megaLogin,
       password: this.settings.megaPassword
@@ -121,6 +127,7 @@ export class AppController {
       realDebridWebUnrestrict: (link: string, signal?: AbortSignal) => this.realDebridWebFallback.unrestrict(link, signal),
       bestDebridWebUnrestrict: (link: string, signal?: AbortSignal) => this.bestDebridWebFallback.unrestrict(link, signal),
       invalidateMegaSession: () => this.megaWebFallback.invalidateSession(),
+      protectEmptyClobber: loadResult.status === "empty-unreadable",
       onHistoryEntry: (entry: HistoryEntry) => {
         addHistoryEntryForRetention(this.storagePaths, this.settings.historyRetentionMode, entry, this.historyLimits());
       }
@@ -173,21 +180,13 @@ export class AppController {
     if (this.settings.autoResumeOnStart) {
       const snapshot = this.manager.getSnapshot();
       const hasPending = Object.values(snapshot.session.items).some((item) => item.status === "queued" || item.status === "reconnect_wait");
-      if (hasPending) {
-        void this.manager.getStartConflicts().then((conflicts) => {
-          const hasConflicts = conflicts.length > 0;
-          if (this.hasAnyProviderToken(this.settings) && !hasConflicts) {
-            if (this.onStateHandler) {
-              logger.info("Auto-Resume beim Start aktiviert (nach Konflikt-Check)");
-              void this.manager.start().catch((err) => logger.warn(`Auto-Resume Start Fehler: ${String(err)}`));
-            } else {
-              this.autoResumePending = true;
-              logger.info("Auto-Resume beim Start vorgemerkt");
-            }
-          } else if (hasConflicts) {
-            logger.info("Auto-Resume übersprungen: Start-Konflikte erkannt");
-          }
-        }).catch((err) => logger.warn(`getStartConflicts Fehler (constructor): ${String(err)}`));
+      if (hasPending && this.hasAnyProviderToken(this.settings)) {
+        if (this.onStateHandler) {
+          this.beginAutoResume();
+        } else {
+          this.autoResumePending = true;
+          logger.info("Auto-Resume beim Start vorgemerkt");
+        }
       }
     }
   }
@@ -244,14 +243,27 @@ export class AppController {
       handler(this.manager.getSnapshot());
       if (this.autoResumePending) {
         this.autoResumePending = false;
-        void this.manager.start().catch((err) => logger.warn(`Auto-Resume Start Fehler: ${String(err)}`));
-        logger.info("Auto-Resume beim Start aktiviert");
+        this.beginAutoResume();
       } else {
         this.manager.triggerIdleExtractions();
       }
     }
   }
 
+  private beginAutoResume(): void {
+    void this.manager.getStartConflicts().then((conflicts) => {
+      const excludePackageIds = new Set(conflicts.map((conflict) => conflict.packageId));
+      if (excludePackageIds.size > 0) {
+        const names = conflicts.map((conflict) => conflict.packageName).join(", ");
+        logger.info(`Auto-Resume: ${excludePackageIds.size} Paket(e) mit Start-Konflikt zurückgehalten (${names}); übrige Pakete starten`);
+      } else {
+        logger.info("Auto-Resume beim Start aktiviert (keine Start-Konflikte)");
+      }
+      void this.manager.start(excludePackageIds.size > 0 ? { excludePackageIds } : undefined)
+        .catch((err) => logger.warn(`Auto-Resume Start Fehler: ${String(err)}`));
+    }).catch((err) => logger.warn(`Auto-Resume Konflikt-Check Fehler: ${String(err)}`));
+  }
+
   public getSnapshot(): UiSnapshot {
     return this.manager.getSnapshot();
   }
@@ -290,6 +302,100 @@ export class AppController {
     return rotated;
   }
 
+  private getSuggestedRemoteHosts(): string[] {
+    const hosts: string[] = [];
+    try {
+      const interfaces = os.networkInterfaces();
+      for (const entry of Object.values(interfaces)) {
+        for (const net of entry || []) {
+          if (net.family === "IPv4" && !net.internal && net.address) {
+            hosts.push(net.address);
+          }
+        }
+      }
+    } catch {
+    }
+    return [...new Set(hosts)];
+  }
+
+  public getRemoteDiagnostics(): RemoteDiagnosticsInfo {
+    const status = getDebugServerRuntimeStatus();
+    const meta = loadRemoteMeta(this.storagePaths.baseDir);
+    const token = getActiveDebugToken();
+    const allowlist = getDebugAllowlist();
+    const suggestedHosts = this.getSuggestedRemoteHosts();
+    const host = meta.publicHost
+      || (status.localOnly ? "127.0.0.1" : (suggestedHosts[0] || status.host));
+    const code = (status.hasToken && token && host)
+      ? encodeConnectionCode({ host, port: status.port, token, name: meta.name || undefined })
+      : null;
+    return {
+      status,
+      code,
+      publicHost: meta.publicHost,
+      name: meta.name,
+      allowlist,
+      suggestedHosts
+    };
+  }
+
+  public async enableRemoteDiagnostics(input: EnableRemoteDiagnosticsInput): Promise<RemoteDiagnosticsInfo> {
+    const baseDir = this.storagePaths.baseDir;
+    const port = input.port && Number.isInteger(input.port) && input.port >= 1024 && input.port <= 65535
+      ? input.port
+      : 9868;
+    const bindHost = input.hostMode === "network" ? "0.0.0.0" : "127.0.0.1";
+    const allowlist = (input.allowlist || []).map((entry) => entry.trim()).filter((entry) => entry.length > 0);
+    if (input.hostMode === "network" && allowlist.length === 0) {
+      throw new Error("Netzwerk-Freigabe erfordert mindestens eine erlaubte IP oder CIDR in der Allowlist.");
+    }
+    let token = getActiveDebugToken();
+    if (!token || input.rotateToken) {
+      token = rotateDebugToken(baseDir).token;
+    }
+    writeDebugServerConfig({ host: bindHost, port, allowlist });
+    saveRemoteMeta(baseDir, { publicHost: (input.publicHost || "").trim(), name: (input.name || "").trim() });
+    await restartDebugServer();
+    this.audit("WARN", "Ferndiagnose aktiviert", {
+      host: bindHost,
+      port,
+      allowlistCount: allowlist.length,
+      localOnly: input.hostMode === "local"
+    });
+    return this.getRemoteDiagnostics();
+  }
+
+  public async disableRemoteDiagnostics(): Promise<RemoteDiagnosticsInfo> {
+    clearDebugToken();
+    await restartDebugServer();
+    this.audit("WARN", "Ferndiagnose deaktiviert (Token entfernt)");
+    return this.getRemoteDiagnostics();
+  }
+
+  public async rotateRemoteDiagnosticsToken(): Promise<RemoteDiagnosticsInfo> {
+    rotateDebugToken(this.storagePaths.baseDir);
+    await restartDebugServer();
+    this.audit("WARN", "Ferndiagnose-Token rotiert");
+    return this.getRemoteDiagnostics();
+  }
+
+  private restoreMcpRemoteFromBackup(section: unknown, restartNow: boolean): void {
+    const restore = resolveMcpRemoteRestore(section);
+    if (!restore) {
+      return;
+    }
+    writeDebugServerConfig({ host: restore.host, port: restore.port, allowlist: restore.allowlist });
+    if (restartNow) {
+      void restartDebugServer().catch(() => {});
+    }
+    this.audit("INFO", "Ferndiagnose-Einstellungen aus Backup wiederhergestellt", {
+      port: restore.port ?? null,
+      allowlistCount: restore.allowlist?.length ?? 0,
+      host: restore.host ?? "unveraendert",
+      restartNow
+    });
+  }
+
   public getDebugSetupCheck(): DebugSetupCheckResult {
     return getDebugSetupCheck(this.storagePaths.baseDir);
   }
@@ -459,16 +565,14 @@ public async checkDebridAccounts(): Promise<DebridAccountStatus[]> {
   }
 
   public async installUpdate(onProgress?: (progress: UpdateInstallProgress) => void): Promise<UpdateInstallResult> {
-    if (this.manager.isSessionRunning()) {
-      this.manager.stop({ parkForRestart: true });
-    }
-    this.manager.persistNowSync();
-
     const cacheAgeMs = Date.now() - this.lastUpdateCheckAt;
     const cached = this.lastUpdateCheck && !this.lastUpdateCheck.error && cacheAgeMs <= 10 * 60 * 1000
       ? this.lastUpdateCheck
       : undefined;
-    const result = await installLatestUpdate(this.settings.updateRepo, cached, onProgress);
+    const result = await runInstallWithResume(
+      this.manager,
+      () => installLatestUpdate(this.settings.updateRepo, cached, onProgress)
+    );
     if (result.started) {
       this.lastUpdateCheck = null;
       this.lastUpdateCheckAt = 0;
@@ -644,13 +748,22 @@ public async checkDebridAccounts(): Promise<DebridAccountStatus[]> {
   }
 
   public exportBackup(): Buffer {
-    const includeDownloads = Boolean(this.settings.backupIncludeDownloads);
+    let mcpRemote: BackupMcpRemote | undefined;
+    if (Boolean(this.settings.backupIncludeMcp)) {
+      const status = getDebugServerRuntimeStatus();
+      mcpRemote = {
+        allowlist: getDebugAllowlist(),
+        port: status.port,
+        hostMode: status.host === "0.0.0.0" ? "network" : "local"
+      };
+    }
     const payloadObj = buildBackupPayload({
       settings: { ...this.settings },
       appVersion: APP_VERSION,
       exportedAt: new Date().toISOString(),
       session: this.manager.getSession(),
-      history: loadHistoryForRetention(this.storagePaths, this.settings.historyRetentionMode, this.historyLimits())
+      history: loadHistoryForRetention(this.storagePaths, this.settings.historyRetentionMode, this.historyLimits()),
+      mcpRemote
     });
     this.audit("INFO", "Backup exportiert", {
       kind: payloadObj.kind,
@@ -724,6 +837,7 @@ public async checkDebridAccounts(): Promise<DebridAccountStatus[]> {
       this.settings = restoredSettings;
       saveSettings(this.storagePaths, this.settings);
       this.manager.setSettings(this.settings, { suppressRetroactiveCleanup: true });
+      this.restoreMcpRemoteFromBackup(parsed.mcpRemote, true);
       this.audit("INFO", "Backup importiert (nur Einstellungen)", {
         accountSummary: buildAccountSummary(this.settings)
       });
@@ -760,6 +874,8 @@ public async checkDebridAccounts(): Promise<DebridAccountStatus[]> {
 
     resetHistoryForRetention(this.storagePaths, this.settings.historyRetentionMode);
 
+    this.restoreMcpRemoteFromBackup(parsed.mcpRemote, false);
+
     this.manager.skipShutdownPersist = true;
     this.manager.blockAllPersistence = true;
     logger.info("Backup wiederhergestellt — App startet automatisch neu");

src/main/backup-payload.ts

@@ -2,6 +2,12 @@ import type { AppSettings, SessionState, HistoryEntry } from "../shared/types";
 
 export type BackupKind = "full" | "settings-only";
 
+export interface BackupMcpRemote {
+  allowlist: string[];
+  port: number;
+  hostMode: "local" | "network";
+}
+
 export interface BackupPayload {
   version: 2;
   kind: BackupKind;
@@ -10,6 +16,7 @@ export interface BackupPayload {
   settings: AppSettings;
   session?: SessionState;
   history?: HistoryEntry[];
+  mcpRemote?: BackupMcpRemote;
 }
 
 export interface BuildBackupInput {
@@ -19,6 +26,7 @@ export interface BuildBackupInput {
   /** Only bundled when includeDownloads is true. */
   session: SessionState;
   history: HistoryEntry[];
+  mcpRemote?: BackupMcpRemote;
 }
 
 /**
@@ -40,9 +48,39 @@ export function buildBackupPayload(input: BuildBackupInput): BackupPayload {
     base.session = input.session;
     base.history = input.history;
   }
+  if (Boolean(input.settings.backupIncludeMcp) && input.mcpRemote) {
+    base.mcpRemote = input.mcpRemote;
+  }
   return base;
 }
 
+export interface McpRemoteRestore {
+  host?: "127.0.0.1" | "0.0.0.0";
+  port?: number;
+  allowlist?: string[];
+}
+
+export function resolveMcpRemoteRestore(section: unknown): McpRemoteRestore | null {
+  if (!section || typeof section !== "object") {
+    return null;
+  }
+  const s = section as { allowlist?: unknown; port?: unknown; hostMode?: unknown };
+  const allowlist = Array.isArray(s.allowlist)
+    ? s.allowlist.filter((entry): entry is string => typeof entry === "string" && entry.trim().length > 0).map((entry) => entry.trim())
+    : undefined;
+  const port = (typeof s.port === "number" && Number.isInteger(s.port) && s.port >= 1024 && s.port <= 65535) ? s.port : undefined;
+  let host: "127.0.0.1" | "0.0.0.0" | undefined;
+  if (s.hostMode === "network") {
+    host = allowlist && allowlist.length > 0 ? "0.0.0.0" : "127.0.0.1";
+  } else if (s.hostMode === "local") {
+    host = "127.0.0.1";
+  }
+  if (host === undefined && port === undefined && allowlist === undefined) {
+    return null;
+  }
+  return { host, port, allowlist };
+}
+
 export interface ImportPlan {
   valid: boolean;
   /** Restore the download list (session + history) and relaunch. */

src/main/connection-code.ts

@@ -0,0 +1,59 @@
+import fs from "node:fs";
+import path from "node:path";
+
+const PREFIX = "rddiag:v1:";
+
+function base64urlEncode(value: string): string {
+  return Buffer.from(value, "utf8")
+    .toString("base64")
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_")
+    .replace(/=+$/, "");
+}
+
+export interface ConnectionCodeInput {
+  host: string;
+  port: number;
+  token: string;
+  name?: string;
+  scheme?: "http" | "https";
+  fingerprint?: string;
+}
+
+export function encodeConnectionCode(input: ConnectionCodeInput): string {
+  const host = String(input.host || "").trim();
+  if (!host) throw new Error("Host fehlt fuer Verbindungscode");
+  const port = Number(input.port);
+  if (!Number.isInteger(port) || port < 1 || port > 65535) throw new Error("Port ungueltig fuer Verbindungscode");
+  if (!input.token) throw new Error("Token fehlt fuer Verbindungscode");
+  const payload: Record<string, unknown> = { v: 1, h: host, p: port, t: input.token };
+  if (input.name) payload.n = String(input.name);
+  if (input.fingerprint) payload.fp = String(input.fingerprint);
+  if (input.scheme && input.scheme !== "http") payload.s = String(input.scheme);
+  return PREFIX + base64urlEncode(JSON.stringify(payload));
+}
+
+export interface RemoteMeta {
+  publicHost: string;
+  name: string;
+}
+
+function remoteMetaPath(baseDir: string): string {
+  return path.join(baseDir, "debug_remote.json");
+}
+
+export function loadRemoteMeta(baseDir: string): RemoteMeta {
+  try {
+    const parsed = JSON.parse(fs.readFileSync(remoteMetaPath(baseDir), "utf8"));
+    return {
+      publicHost: String(parsed.publicHost || ""),
+      name: String(parsed.name || "")
+    };
+  } catch {
+    return { publicHost: "", name: "" };
+  }
+}
+
+export function saveRemoteMeta(baseDir: string, meta: RemoteMeta): void {
+  fs.writeFileSync(remoteMetaPath(baseDir), JSON.stringify({ publicHost: meta.publicHost, name: meta.name }, null, 2), "utf8");
+}

src/main/constants.ts

@@ -109,6 +109,7 @@ export function defaultSettings(): AppSettings {
     hideExtractedItems: true,
     confirmDeleteSelection: true,
     backupIncludeDownloads: false,
+    backupIncludeMcp: false,
     notifyUrl: "",
     notifyMention: "",
     notifyOnPackageCompleted: false,

src/main/debrid.ts

@@ -123,6 +123,11 @@ export function getDebridLinkKeyRuntimeStateForTests(keyId: string): DebridLinkR
   return status ? status.state : null;
 }
 
+export function getDebridLinkKeyCooldownStateForTests(keyId: string, now = Date.now()): { remainingMs: number; message: string } | null {
+  const state = getDebridLinkKeyCooldownState(keyId, now);
+  return state ? { remainingMs: state.remainingMs, message: state.message } : null;
+}
+
 function clearDebridLinkKeyCooldownState(keyId: string): void {
   debridLinkKeyCooldowns.delete(keyId);
   debridLinkKeyCooldownDetails.delete(keyId);
@@ -283,6 +288,7 @@ type MegaDebridCooldownCategory = "invalid" | "rate_limit" | "quota" | "temporar
 type MegaDebridCooldownDetail = { until: number; message: string; category: MegaDebridCooldownCategory; untilRestart?: boolean };
 const megaDebridAccountCooldowns = new Map<string, MegaDebridCooldownDetail>();
 const MEGA_DEBRID_ACCOUNT_COOLDOWN_MS = 120_000;
+const MEGA_DEBRID_SLOW_LINK_RETRY_MS = 120_000;
 const MEGA_DEBRID_INVALID_ACCOUNT_COOLDOWN_MS = 60 * 60 * 1000;
 
 // A Mega-Web account abort (the shared unrestrict timeout firing while this
@@ -296,7 +302,7 @@ function getMegaDebridAbortMinRunMs(): number {
 }
 
 const megaDebridEmptyResponseStreaks = new Map<string, number>();
-export const MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART = 3;
+export const MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART = 10;
 
 let megaDebridRotationCursor = 0;
 let megaDebridStickyCount = 0;
@@ -333,6 +339,25 @@ export function resetMegaDebridRuntimeStateForTests(): void {
   megaDebridInFlight.clear();
 }
 
+export function getMegaDebridInFlightCountForMode(mode: "api" | "web"): number {
+  const suffix = `:${mode}`;
+  let total = 0;
+  for (const [key, count] of megaDebridInFlight) {
+    if (key.endsWith(suffix)) {
+      total += count;
+    }
+  }
+  return total;
+}
+
+export function primeMegaDebridInFlightForTests(key: string, count: number): void {
+  if (count <= 0) {
+    megaDebridInFlight.delete(key);
+    return;
+  }
+  megaDebridInFlight.set(key, count);
+}
+
 export function pruneExpiredMegaDebridRuntimeState(now = Date.now()): number {
   let removed = 0;
   const grace = 60 * 60 * 1000;
@@ -349,14 +374,26 @@ export function primeMegaDebridRuntimeCooldownForTests(accountId: string, cooldo
   setMegaDebridAccountCooldownState(accountId, cooldownMs, message, "temporary");
 }
 
-export function primeMegaDebridUntilRestartForTests(accountId: string, message = "Tageslimit (Test) — bis Neustart gesperrt"): void {
+export function primeMegaDebridUntilRestartForTests(accountId: string, message = "Tageslimit (Test) — bis zum Tagesreset gesperrt"): void {
   setMegaDebridAccountCooldownState(accountId, 0, message, "quota", true);
 }
 
+export function classifyMegaDebridAccountFailureForTests(
+  error: unknown
+): { fatal: boolean; cooldownMs: number; message: string; category: MegaDebridCooldownCategory; limitSignal?: boolean } {
+  return MegaDebridClient.classifyAccountFailure(error);
+}
+
 function clearMegaDebridAccountCooldownState(accountId: string): void {
   megaDebridAccountCooldowns.delete(accountId);
 }
 
+function megaDebridDailyParkExpiry(now: number): number {
+  const midnight = new Date(now);
+  midnight.setHours(24, 0, 0, 0);
+  return Math.max(midnight.getTime(), now + MEGA_DEBRID_ACCOUNT_COOLDOWN_MS);
+}
+
 function setMegaDebridAccountCooldownState(
   accountId: string,
   cooldownMs: number,
@@ -366,7 +403,7 @@ function setMegaDebridAccountCooldownState(
 ): void {
   if (untilRestart) {
     megaDebridAccountCooldowns.set(accountId, {
-      until: Number.MAX_SAFE_INTEGER,
+      until: megaDebridDailyParkExpiry(Date.now()),
       message,
       category,
       untilRestart: true
@@ -405,6 +442,106 @@ export function getMegaDebridAccountCooldownState(
   };
 }
 
+export interface ProviderRuntimeCooldown {
+  untilMs: number;
+  remainingMs: number;
+  message: string;
+  category: string;
+  untilRestart?: boolean;
+}
+
+export interface ProviderRuntimeSnapshot {
+  capturedAtMs: number;
+  megaDebrid: {
+    rotationCursor: number;
+    stickyCount: number;
+    accounts: Array<{
+      key: string;
+      cooldown: ProviderRuntimeCooldown | null;
+      inFlight: number;
+      emptyResponseStreak: number;
+    }>;
+  };
+  debridLink: {
+    keys: Array<{
+      keyId: string;
+      cooldown: ProviderRuntimeCooldown | null;
+      runtimeStatus: { state: string; detail: string; updatedAt: number } | null;
+    }>;
+    hostCooldowns: Array<{ key: string; cooldown: ProviderRuntimeCooldown }>;
+  };
+}
+
+export function getProviderRuntimeSnapshot(now = Date.now()): ProviderRuntimeSnapshot {
+  const megaKeys = new Set<string>([
+    ...megaDebridAccountCooldowns.keys(),
+    ...megaDebridInFlight.keys(),
+    ...megaDebridEmptyResponseStreaks.keys()
+  ]);
+  const megaAccounts = [...megaKeys].sort().map((key) => {
+    const detail = megaDebridAccountCooldowns.get(key);
+    return {
+      key,
+      cooldown: detail
+        ? {
+            untilMs: detail.until,
+            remainingMs: Math.max(0, detail.until - now),
+            message: detail.message,
+            category: detail.category,
+            untilRestart: detail.untilRestart === true
+          }
+        : null,
+      inFlight: megaDebridInFlight.get(key) ?? 0,
+      emptyResponseStreak: megaDebridEmptyResponseStreaks.get(key) ?? 0
+    };
+  });
+
+  const dlKeyIds = new Set<string>([
+    ...debridLinkKeyCooldowns.keys(),
+    ...debridLinkKeyRuntimeStatuses.keys()
+  ]);
+  const dlKeys = [...dlKeyIds].sort().map((keyId) => {
+    const until = Number(debridLinkKeyCooldowns.get(keyId) || 0);
+    const detail = debridLinkKeyCooldownDetails.get(keyId);
+    const status = debridLinkKeyRuntimeStatuses.get(keyId) || null;
+    return {
+      keyId,
+      cooldown: until > 0
+        ? {
+            untilMs: until,
+            remainingMs: Math.max(0, until - now),
+            message: detail?.message ?? "",
+            category: detail?.category ?? "temporary"
+          }
+        : null,
+      runtimeStatus: status ? { state: status.state, detail: status.detail, updatedAt: status.updatedAt } : null
+    };
+  });
+
+  const dlHostCooldowns = [...debridLinkKeyHostCooldowns].map(([key, until]) => {
+    const detail = debridLinkKeyHostCooldownDetails.get(key);
+    return {
+      key,
+      cooldown: {
+        untilMs: until,
+        remainingMs: Math.max(0, until - now),
+        message: detail?.message ?? "",
+        category: detail?.category ?? "temporary"
+      }
+    };
+  });
+
+  return {
+    capturedAtMs: now,
+    megaDebrid: {
+      rotationCursor: megaDebridRotationCursor,
+      stickyCount: megaDebridStickyCount,
+      accounts: megaAccounts
+    },
+    debridLink: { keys: dlKeys, hostCooldowns: dlHostCooldowns }
+  };
+}
+
 const LINKSNAPPY_API_BASE = "https://linksnappy.com/api";
 
 const PROVIDER_LABELS: Record<DebridProvider, string> = {
@@ -1309,6 +1446,13 @@ function toProviderOrder(primary: DebridProvider, secondary: DebridFallbackProvi
   return uniqueProviderOrder(order);
 }
 
+export function leadProviderChainWith(order: readonly DebridProvider[], preferred: DebridProvider | null | undefined): DebridProvider[] {
+  if (!preferred || !order.includes(preferred)) {
+    return [...order];
+  }
+  return [preferred, ...order.filter((provider) => provider !== preferred)];
+}
+
 function isRapidgatorLink(link: string): boolean {
   try {
     const hostname = new URL(link).hostname.toLowerCase();
@@ -1866,6 +2010,9 @@ class MegaDebridClient {
         return null;
       });
       if (signal?.aborted) {
+        if (/queue.?timeout/i.test(lastError)) {
+          throw new Error(lastError.replace(/^Error:\s*/i, ""));
+        }
         throw new Error("aborted:debrid");
       }
       if (web?.directUrl) {
@@ -1987,7 +2134,7 @@ class MegaDebridClient {
           ? "Neustart"
           : new Date(accountCooldownState.until).toLocaleTimeString();
         const reasonText = accountCooldownState.untilRestart
-          ? "Tageslimit erreicht — bis Neustart gesperrt"
+          ? "Tageslimit erreicht — bis zum Tagesreset gesperrt"
           : `Cooldown bis ${untilStr}`;
         logger.info(`Mega-Debrid${accountLabel}: uebersprungen (${reasonText}), pruefe naechsten Account`);
         logAccountRotation("INFO", providerName, rotationLabel, "SKIP_COOLDOWN", {
@@ -2041,15 +2188,33 @@ class MegaDebridClient {
       } catch (error) {
         const elapsedMs = Date.now() - testStartedAt;
         const abortText = compactErrorText(error).replace(/^Error:\s*/i, "");
-        // Timeout/abort on THIS account (the shared unrestrict signal fired). Cool
-        // the account down — if it actually ran, not a quick user-cancel — so the
-        // download-manager's retry rotates to the NEXT account instead of hammering
-        // this one. The shared signal is now aborted, so we stop this pass; the
-        // retry runs the rotation fresh with this account skipped. A genuine cancel
-        // is not retried by the caller, so the cooldown is harmless there.
+        // Timeout/abort on THIS account (the shared unrestrict timeout fired). The
+        // account-wide cooldown exists ONLY to make the retry rotate to another
+        // account — so it is set only when another usable account actually exists.
+        // With no rotation target (single account / all others busy), cooling the
+        // sole account would freeze EVERY queued item while the account is healthy;
+        // a >60s timeout is a slow-LINK signal, not an unhealthy-account signal, so
+        // we park just this link (mega_debrid_slow_link) and leave the account free
+        // for other items. A quick user-cancel (below the min run) parks nothing.
         if (/aborted/i.test(abortText) && !/timeout/i.test(abortText)) {
           const ranLongEnough = elapsedMs >= getMegaDebridAbortMinRunMs();
-          if (ranLongEnough) {
+          const otherUsableAccounts = orderedEntries.reduce((count, candidate) => {
+            if (candidate.account.id === account.id) {
+              return count;
+            }
+            if (isMegaDebridAccountDisabled(settings, candidate.account.id)) {
+              return count;
+            }
+            if (isMegaDebridAccountDailyLimitReached(settings, candidate.account.id)) {
+              return count;
+            }
+            if (getMegaDebridAccountCooldownState(`${candidate.account.id}:${mode}`)) {
+              return count;
+            }
+            return count + 1;
+          }, 0);
+          const rotateToAnotherAccount = ranLongEnough && otherUsableAccounts > 0;
+          if (rotateToAnotherAccount) {
             setMegaDebridAccountCooldownState(cooldownKey, MEGA_DEBRID_ACCOUNT_COOLDOWN_MS, `Abbruch/Timeout nach ${Math.ceil(elapsedMs / 1000)}s`, "temporary");
           }
           traceConversionPhase({
@@ -2058,15 +2223,18 @@ class MegaDebridClient {
             account: rotationLabel,
             workMs: elapsedMs,
             outcome: "aborted",
-            detail: `${abortText}${ranLongEnough ? ` cd=${Math.ceil(MEGA_DEBRID_ACCOUNT_COOLDOWN_MS / 1000)}s` : ""}`
+            detail: `${abortText}${rotateToAnotherAccount ? ` cd=${Math.ceil(MEGA_DEBRID_ACCOUNT_COOLDOWN_MS / 1000)}s` : ranLongEnough ? ` slowlink=${Math.ceil(MEGA_DEBRID_SLOW_LINK_RETRY_MS / 1000)}s` : ""}`
           });
           failures.push(`Mega-Debrid${accountLabel}: ${abortText}`);
           logAccountRotation("WARN", providerName, rotationLabel, "TIMEOUT_COOLDOWN", {
             elapsedMs,
             reason: abortText,
-            cooldownSec: ranLongEnough ? Math.ceil(MEGA_DEBRID_ACCOUNT_COOLDOWN_MS / 1000) : 0,
-            next: "naechster Account beim Retry"
+            cooldownSec: rotateToAnotherAccount ? Math.ceil(MEGA_DEBRID_ACCOUNT_COOLDOWN_MS / 1000) : 0,
+            next: rotateToAnotherAccount ? "naechster Account beim Retry" : "Einzel-Retry (Account bleibt fuer andere Items frei)"
           });
+          if (ranLongEnough && !rotateToAnotherAccount) {
+            throw new Error(`mega_debrid_slow_link:${MEGA_DEBRID_SLOW_LINK_RETRY_MS}:Mega-Debrid${accountLabel}: ${abortText}`);
+          }
           throw new Error(`Mega-Debrid${accountLabel}: ${abortText}`);
         }
         const failure = MegaDebridClient.classifyAccountFailure(error);
@@ -2086,7 +2254,7 @@ class MegaDebridClient {
           const streak = recordMegaDebridEmptyResponseStreak(cooldownKey);
           if (streak >= MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART) {
             parkUntilRestart = true;
-            parkMessage = `Tageslimit erreicht (${streak}x kein Server/leere Antwort) — bis Neustart gesperrt`;
+            parkMessage = `Tageslimit erreicht (${streak}x leere Antwort in Folge) — bis zum Tagesreset gesperrt`;
           }
         } else {
           clearMegaDebridEmptyResponseStreak(cooldownKey);
@@ -2109,7 +2277,7 @@ class MegaDebridClient {
           throw new Error(`Mega-Debrid${accountLabel}: ${failure.message}`);
         }
         const cooldownInfo = parkUntilRestart
-          ? ", bis Neustart gesperrt"
+          ? ", bis zum Tagesreset gesperrt"
           : failure.cooldownMs > 0
             ? `, Cooldown ${Math.ceil(failure.cooldownMs / 1000)}s`
             : "";
@@ -2146,14 +2314,15 @@ class MegaDebridClient {
         throw new Error(`mega_debrid_cooldown:${retryMs}:${cooldownFailures.join(" | ")}`);
       }
       if (parkedUntilRestartSeen) {
-        throw new Error(`Mega-Debrid: Alle Accounts am Tageslimit (bis Neustart gesperrt)${cooldownFailures.length > 0 ? ` | ${cooldownFailures.join(" | ")}` : ""}`);
+        const resetParkMs = Math.max(1000, megaDebridDailyParkExpiry(Date.now()) - Date.now() + 1000);
+        throw new Error(`mega_debrid_reset_park:${resetParkMs}:Mega-Debrid: Alle Accounts am Tageslimit (bis zum Tagesreset gesperrt)${cooldownFailures.length > 0 ? ` | ${cooldownFailures.join(" | ")}` : ""}`);
       }
       throw new Error("Mega-Debrid: Kein aktiver Account verfuegbar");
     }
     throw new Error(failures.join(" | ") || "Mega-Debrid: Kein aktiver Account verfuegbar");
   }
 
-  private static classifyAccountFailure(
+  static classifyAccountFailure(
     error: unknown
   ): { fatal: boolean; cooldownMs: number; message: string; category: MegaDebridCooldownCategory; limitSignal?: boolean } {
     const errorText = compactErrorText(error).replace(/^Error:\s*/i, "");
@@ -2179,6 +2348,10 @@ class MegaDebridClient {
       return { fatal: false, cooldownMs: 0, message: germanMegaDebridResolveReason(errorText), category: "temporary" };
     }
 
+    if (/lieferte kein ergebnis|linkgenerierung[^.]*kein ergebnis/i.test(errorText)) {
+      return { fatal: false, cooldownMs: 0, message: germanMegaDebridResolveReason(errorText), category: "temporary" };
+    }
+
     if (/permanent ungültig|hosternotavailable|file.?not.?found|file.?unavailable|link.?is.?dead/i.test(errorText)) {
       return { fatal: true, cooldownMs: 0, message: errorText, category: "skip" };
     }
@@ -2206,8 +2379,7 @@ class MegaDebridClient {
         fatal: false,
         cooldownMs: MEGA_DEBRID_ACCOUNT_COOLDOWN_MS,
         message: "Kein Server fuer diesen Hoster (Tageslimit/Hoster nicht verfuegbar)",
-        category: "quota",
-        limitSignal: true
+        category: "quota"
       };
     }
 
@@ -2765,6 +2937,23 @@ class DebridLinkClient {
       } catch (error) {
         const failure = await this.classifyKeyFailure(error, apiKey, link, signal);
         const elapsedMs = Date.now() - testStartedAt;
+        const abortText = compactErrorText(error).replace(/^Error:\s*/i, "");
+        if (/aborted/i.test(abortText) && !/timeout/i.test(abortText)) {
+          const ranLongEnough = elapsedMs >= getMegaDebridAbortMinRunMs();
+          if (ranLongEnough) {
+            setDebridLinkKeyCooldownState(apiKey.id, DEBRID_LINK_KEY_COOLDOWN_MS, `Abbruch/Timeout nach ${Math.ceil(elapsedMs / 1000)}s`, "temporary");
+          } else {
+            clearDebridLinkKeyCooldownState(apiKey.id);
+          }
+          failures.push(`Debrid-Link${keyLabel}: ${abortText}`);
+          logAccountRotation("WARN", providerName, rotationLabel, "TIMEOUT_COOLDOWN", {
+            elapsedMs,
+            reason: abortText,
+            cooldownSec: ranLongEnough ? Math.ceil(DEBRID_LINK_KEY_COOLDOWN_MS / 1000) : 0,
+            next: "naechster Key beim Retry"
+          });
+          throw new Error(`Debrid-Link${keyLabel}: ${abortText}`);
+        }
         attemptedKeyFailures.push({
           message: `Debrid-Link${keyLabel}: ${failure.message}`,
           cooldownMs: failure.cooldownMs,
@@ -3689,7 +3878,7 @@ export class DebridService {
     return `${PROVIDER_LABELS[effectiveProvider]} Tageslimit erreicht`;
   }
 
-  public async unrestrictLink(link: string, signal?: AbortSignal, settingsSnapshot?: AppSettings): Promise<ProviderUnrestrictedLink> {
+  public async unrestrictLink(link: string, signal?: AbortSignal, settingsSnapshot?: AppSettings, preferredLeadProvider?: DebridProvider | null): Promise<ProviderUnrestrictedLink> {
     const settings = settingsSnapshot ? cloneSettings(settingsSnapshot) : cloneSettings(this.settings);
 
     const routing = settings.hosterRouting || {};
@@ -3766,9 +3955,10 @@ export class DebridService {
       }
     }
 
-    const order: DebridProvider[] = (settings.providerOrder && settings.providerOrder.length > 0)
+    const baseOrder: DebridProvider[] = (settings.providerOrder && settings.providerOrder.length > 0)
       ? uniqueProviderOrder(settings.providerOrder)
       : toProviderOrder(settings.providerPrimary, settings.providerSecondary, settings.providerTertiary);
+    const order = leadProviderChainWith(baseOrder, preferredLeadProvider);
 
     const primary = order[0];
     if (!settings.autoProviderFallback) {

src/main/debug-server.ts

@@ -15,6 +15,8 @@ import { createStoragePaths, loadHistory, loadSettings } from "./storage";
 import { buildAccountSummary, buildRedactedSettingsPayload, buildStatsPayload, summarizeHistoryEntry } from "./support-data";
 import { buildSupportBundle, getSupportBundleDefaultFileName } from "./support-bundle";
 import { getTraceConfig, getTraceConfigPath, getTraceLogPath, logTraceEvent, setTraceEnabled, updateTraceConfig } from "./trace-log";
+import { getConversionLogPath } from "./conversion-trace";
+import { getProviderRuntimeSnapshot } from "./debrid";
 import { getWindowsHostDiagnostics } from "./windows-host-diagnostics";
 import type { DownloadManager } from "./download-manager";
 import type { DownloadItem, PackageEntry, UiSnapshot } from "../shared/types";
@@ -43,12 +45,14 @@ const DEBUG_ENDPOINTS: DebugEndpointDescriptor[] = [
   { method: "GET", path: "/logs/rename", queryExample: "lines=100&grep=keyword", description: "Reads the dedicated rename and MKV move log." },
   { method: "GET", path: "/logs/trace", queryExample: "lines=100&grep=keyword", description: "Reads the optional support trace log." },
   { method: "GET", path: "/logs/session", queryExample: "lines=100&grep=keyword", description: "Reads the session log tail." },
+  { method: "GET", path: "/logs/conversion", queryExample: "lines=100&grep=keyword", description: "Reads the per-item link conversion/unrestrict lifecycle log (token, API getLink, web, account rotation, aborts with timings)." },
   { method: "GET", path: "/logs/package", queryExample: "package=Release&lines=100&grep=keyword", description: "Reads the package log for a specific package name or id." },
   { method: "GET", path: "/logs/item", queryExample: "item=episode.part2.rar&lines=100&grep=keyword", description: "Reads the item log for a specific file name or item id." },
   { method: "GET", path: "/errors", queryExample: "level=ERROR&limit=100", description: "Returns the in-memory ring of the most recent WARN/ERROR log lines." },
   { method: "GET", path: "/trace/config", queryExample: "enable=1&note=support&durationMinutes=120", description: "Reads or updates the support trace configuration." },
   { method: "GET", path: "/settings", description: "Returns a redacted settings snapshot without raw secrets." },
   { method: "GET", path: "/accounts", description: "Returns a redacted account/provider configuration summary." },
+  { method: "GET", path: "/providers", description: "Live provider runtime state: per-account/key cooldowns (until/remaining/reason/category), in-flight depth, Mega rotation cursor, empty-response streaks. The 'why is it cooling down right now' view." },
   { method: "GET", path: "/stats", description: "Returns live session stats plus persisted all-time totals." },
   { method: "GET", path: "/history", queryExample: "limit=50&status=completed", description: "Returns history entries with optional filters." },
   { method: "GET", path: "/status", description: "Returns a live high-level status overview." },
@@ -65,6 +69,16 @@ let authToken = "";
 let bindHost = DEFAULT_HOST;
 let bindPort = DEFAULT_PORT;
 let runtimeBaseDir = "";
+let allowlist: string[] = [];
+
+export interface DebugServerRuntimeStatus {
+  running: boolean;
+  host: string;
+  port: number;
+  hasToken: boolean;
+  localOnly: boolean;
+  allowlistCount: number;
+}
 
 function getStoragePaths() {
   return createStoragePaths(runtimeBaseDir);
@@ -140,6 +154,94 @@ function getHost(baseDir: string): string {
   return DEFAULT_HOST;
 }
 
+function getAllowlistPath(baseDir: string = runtimeBaseDir): string {
+  return path.join(baseDir, "debug_allowlist.txt");
+}
+
+function loadAllowlist(baseDir: string): string[] {
+  try {
+    return fs.readFileSync(getAllowlistPath(baseDir), "utf8")
+      .split(/\r?\n/)
+      .map((line) => line.trim())
+      .filter((line) => line.length > 0 && !line.startsWith("#"));
+  } catch {
+    return [];
+  }
+}
+
+function normalizeIp(ip: string): string {
+  return String(ip || "").trim().replace(/^::ffff:/i, "").toLowerCase();
+}
+
+function isLoopbackIp(ip: string): boolean {
+  const x = normalizeIp(ip);
+  return x === "::1" || x === "localhost" || x.startsWith("127.");
+}
+
+function ipv4ToInt(ip: string): number | null {
+  const parts = ip.split(".");
+  if (parts.length !== 4) {
+    return null;
+  }
+  let result = 0;
+  for (const part of parts) {
+    const value = Number(part);
+    if (!Number.isInteger(value) || value < 0 || value > 255) {
+      return null;
+    }
+    result = (result * 256) + value;
+  }
+  return result >>> 0;
+}
+
+function matchIpRule(clientIp: string, rule: string): boolean {
+  const client = normalizeIp(clientIp);
+  const r = rule.trim().toLowerCase();
+  if (!r) {
+    return false;
+  }
+  if (r === "*" || r === "0.0.0.0/0") {
+    return true;
+  }
+  if (r === client) {
+    return true;
+  }
+  const slash = r.indexOf("/");
+  if (slash > 0) {
+    const baseInt = ipv4ToInt(r.slice(0, slash));
+    const clientInt = ipv4ToInt(client);
+    const bits = Number(r.slice(slash + 1));
+    if (baseInt === null || clientInt === null || !Number.isInteger(bits) || bits < 0 || bits > 32) {
+      return false;
+    }
+    if (bits === 0) {
+      return true;
+    }
+    const mask = bits === 32 ? 0xffffffff : (~((1 << (32 - bits)) - 1)) >>> 0;
+    return (clientInt & mask) === (baseInt & mask);
+  }
+  return false;
+}
+
+export function evaluateClientAllowed(clientIp: string, rules: string[]): boolean {
+  const client = normalizeIp(clientIp);
+  if (isLoopbackIp(client) || client === "") {
+    return true;
+  }
+  if (rules.length === 0) {
+    return false;
+  }
+  return rules.some((rule) => matchIpRule(client, rule));
+}
+
+export function getPeerIp(req: http.IncomingMessage): string {
+  return normalizeIp(req.socket?.remoteAddress || "");
+}
+
+function isClientAllowed(clientIp: string): boolean {
+  return evaluateClientAllowed(clientIp, allowlist);
+}
+
 function checkAuth(req: http.IncomingMessage): boolean {
   if (!authToken) {
     return false;
@@ -258,6 +360,7 @@ function buildAiManifest(baseDir: string): Record<string, unknown> {
       "Call /meta first to confirm the server is reachable and to re-read the endpoint list.",
       "Use /self-check or /debug/setup to quickly verify whether token, host, manifest, trace, disk space, and log sizes are in a good support state.",
       "Use /diagnostics for an overview, then drill into /logs/item, /logs/package, /logs/rename, /status, /packages, /items, /settings, /accounts, /stats, /history, or /logs/trace.",
+      "For provider stalls/cooldowns, call /providers for the live cooldown state (until/remaining/reason per account/key) and /logs/conversion for the per-item resolve lifecycle (token, API, web, rotation, aborts with timings).",
       "If a full handoff is needed, download /support/bundle as a ZIP."
     ],
     auth: {
@@ -461,6 +564,19 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
     return;
   }
 
+  const peerIp = getPeerIp(req);
+  if (!isClientAllowed(peerIp)) {
+    if (traceConfig.enabled && traceConfig.logDebugRequests) {
+      logTraceEvent("WARN", "debug-http", "Durch Allowlist blockiert", {
+        peerIp,
+        forwardedFor: extractDebugClientIp(req),
+        url: sanitizeRequestUrlForTrace(req.url || "/")
+      });
+    }
+    jsonResponse(res, 403, { error: "Forbidden", reason: "Client-IP nicht in Allowlist", clientIp: peerIp });
+    return;
+  }
+
   if (!checkAuth(req)) {
     if (traceConfig.enabled && traceConfig.logDebugRequests) {
       logTraceEvent("WARN", "debug-http", "Unauthorized request", {
@@ -596,6 +712,25 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
     return;
   }
 
+  if (pathname === "/logs/conversion") {
+    const count = normalizeLinesParam(url.searchParams.get("lines"), 100);
+    const grep = url.searchParams.get("grep") || "";
+    const logPath = getConversionLogPath();
+    const lines = logPath ? filterLines(readLogTailFromFile(logPath, count), grep) : [];
+    jsonResponse(res, 200, {
+      path: logPath,
+      available: Boolean(logPath),
+      lines,
+      count: lines.length
+    });
+    return;
+  }
+
+  if (pathname === "/providers") {
+    jsonResponse(res, 200, getProviderRuntimeSnapshot());
+    return;
+  }
+
   if (pathname === "/trace/config") {
     const patch: Record<string, unknown> = {};
     const enabled = toBooleanQuery(url.searchParams.get("enable"));
@@ -881,6 +1016,7 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
       settings: buildRedactedSettingsPayload(readSupportSettings()),
       stats: buildStatsPayload(snapshot),
       accounts: buildAccountSummary(readSupportSettings()),
+      providers: getProviderRuntimeSnapshot(),
       history: {
         total: readSupportHistory().length,
         recent: readSupportHistory()
@@ -912,6 +1048,10 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
           path: sessionLogPath,
           lines: filterLines(readLogTailFromFile(sessionLogPath, lineCount), grep)
         },
+        conversion: {
+          path: getConversionLogPath(),
+          lines: getConversionLogPath() ? filterLines(readLogTailFromFile(getConversionLogPath() as string, lineCount), grep) : []
+        },
         package: selectedPackage ? {
           path: packageLogPath,
           lines: filterLines(readLogTailFromFile(packageLogPath, lineCount), grep)
@@ -927,32 +1067,126 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
   });
 }
 
+function openServerSocket(): Promise<void> {
+  return new Promise((resolve) => {
+    authToken = loadToken(runtimeBaseDir);
+    bindPort = getPort(runtimeBaseDir);
+    bindHost = getHost(runtimeBaseDir);
+    allowlist = loadAllowlist(runtimeBaseDir);
+    writeAiManifest(runtimeBaseDir);
+    if (!authToken) {
+      logger.info("Debug-Server: Kein Token in debug_token.txt, Server wird nicht gestartet");
+      resolve();
+      return;
+    }
+    if (bindHost === "0.0.0.0" && allowlist.length === 0) {
+      logger.warn("Debug-Server: Netzwerk-Bind ohne Allowlist - nur Loopback-Clients werden akzeptiert (fail-closed)");
+    }
+    const srv = http.createServer(handleRequest);
+    let settled = false;
+    const settle = (): void => {
+      if (!settled) {
+        settled = true;
+        resolve();
+      }
+    };
+    srv.on("error", (err: NodeJS.ErrnoException) => {
+      if (err.code === "EADDRINUSE") {
+        logger.warn(`Debug-Server: Port ${bindPort} belegt (EADDRINUSE) - Server nicht gestartet`);
+      } else {
+        logger.warn(`Debug-Server Fehler: ${String(err)}`);
+      }
+      if (server === srv) {
+        server = null;
+      }
+      settle();
+    });
+    srv.listen(bindPort, bindHost, () => {
+      logger.info(`Debug-Server gestartet auf ${bindHost}:${bindPort} (Allowlist: ${allowlist.length})`);
+      settle();
+    });
+    server = srv;
+  });
+}
+
 export function startDebugServer(mgr: DownloadManager, baseDir: string): void {
   runtimeBaseDir = baseDir;
-  authToken = loadToken(baseDir);
-  bindPort = getPort(baseDir);
-  bindHost = getHost(baseDir);
-  writeAiManifest(baseDir);
-  if (!authToken) {
-    logger.info("Debug-Server: Kein Token in debug_token.txt, Server wird nicht gestartet");
-    return;
-  }
-
   manager = mgr;
+  void openServerSocket();
+}
 
-  server = http.createServer(handleRequest);
-  server.listen(bindPort, bindHost, () => {
-    logger.info(`Debug-Server gestartet auf ${bindHost}:${bindPort}`);
-  });
-  server.on("error", (err) => {
-    logger.warn(`Debug-Server Fehler: ${String(err)}`);
+export async function restartDebugServer(): Promise<DebugServerRuntimeStatus> {
+  const old = server;
+  if (old) {
     server = null;
-  });
+    await new Promise<void>((resolve) => {
+      let settled = false;
+      const done = (): void => {
+        if (!settled) {
+          settled = true;
+          resolve();
+        }
+      };
+      old.close(() => done());
+      try {
+        old.closeAllConnections?.();
+      } catch {
+      }
+      setTimeout(done, 1500);
+    });
+  }
+  await openServerSocket();
+  return getDebugServerRuntimeStatus();
+}
+
+export function getDebugServerRuntimeStatus(): DebugServerRuntimeStatus {
+  return {
+    running: Boolean(server && server.listening),
+    host: bindHost,
+    port: bindPort,
+    hasToken: Boolean(authToken),
+    localOnly: isLoopbackIp(bindHost) || bindHost === "127.0.0.1",
+    allowlistCount: allowlist.length
+  };
+}
+
+export function getActiveDebugToken(): string {
+  return authToken || loadToken(runtimeBaseDir);
+}
+
+export function getDebugAllowlist(): string[] {
+  return [...allowlist];
+}
+
+export function writeDebugServerConfig(opts: { host?: string; port?: number; allowlist?: string[] }): void {
+  if (opts.host !== undefined) {
+    fs.writeFileSync(path.join(runtimeBaseDir, "debug_host.txt"), `${opts.host}\n`, "utf8");
+  }
+  if (opts.port !== undefined) {
+    fs.writeFileSync(path.join(runtimeBaseDir, "debug_port.txt"), `${opts.port}\n`, "utf8");
+  }
+  if (opts.allowlist !== undefined) {
+    const body = opts.allowlist.length > 0 ? opts.allowlist.join("\n") + "\n" : "";
+    fs.writeFileSync(getAllowlistPath(), body, "utf8");
+  }
+}
+
+export function clearDebugToken(): void {
+  try {
+    fs.unlinkSync(getDebugTokenPath());
+  } catch {
+  }
+  authToken = "";
+  writeAiManifest(runtimeBaseDir);
 }
 
 export function stopDebugServer(): void {
   if (server) {
     server.close();
+    try {
+      server.closeAllConnections?.();
+    } catch {
+    }
     server = null;
     logger.info("Debug-Server gestoppt");
   }

src/main/download-manager.ts

@@ -52,7 +52,7 @@ function releaseTlsSkip(): void {
 }
 import { cleanupCancelledPackageArtifactsAsync, removeDownloadLinkArtifacts, removeSampleArtifacts } from "./cleanup";
 import { planDownloadCompletion, reconcileFinalizedSize, validateDownloadedFileCompletion } from "./download-completion";
-import { AllDebridWebUnrestrictor, BestDebridWebUnrestrictor, DebridService, MegaWebUnrestrictor, RealDebridWebUnrestrictor, checkRapidgatorOnline, fetchAllDebridHostInfo, getAvailableDebridLinkApiKeys, getAvailableMegaDebridAccounts, getMegaDebridAccountCooldownState, pruneExpiredDebridLinkRuntimeState, pruneExpiredMegaDebridRuntimeState } from "./debrid";
+import { AllDebridWebUnrestrictor, BestDebridWebUnrestrictor, DebridService, MegaWebUnrestrictor, RealDebridWebUnrestrictor, checkRapidgatorOnline, fetchAllDebridHostInfo, getAvailableDebridLinkApiKeys, getAvailableMegaDebridAccounts, getMegaDebridAccountCooldownState, getMegaDebridInFlightCountForMode, pruneExpiredDebridLinkRuntimeState, pruneExpiredMegaDebridRuntimeState } from "./debrid";
 import { cleanupArchives, clearExtractResumeState, collectArchiveCleanupTargets, detectArchiveSignature, extractPackageArchives, findArchiveCandidates, hasAnyFilesRecursive, removeEmptyDirectoryTree, resetExtractorCachesForPasswordChange, type ExtractArchiveFailureInfo } from "./extractor";
 import { validateFileAgainstManifest } from "./integrity";
 import { classifyDiskError } from "./fs-error";
@@ -131,6 +131,17 @@ const ARCHIVE_SETTLE_MAX_WAIT_MS = 5000;
 
 const MAX_SAME_DIRECT_URL_ATTEMPTS = 3;
 
+const MAX_HTTP416_FRESH_RESTARTS = 2;
+const HTTP416_FRESH_RESTART_DELAY_MS = 8000;
+
+function getHttp416FreshRestartDelayMs(): number {
+  const fromEnv = Number(process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS ?? NaN);
+  if (Number.isFinite(fromEnv) && fromEnv >= 0 && fromEnv <= 600000) {
+    return Math.floor(fromEnv);
+  }
+  return HTTP416_FRESH_RESTART_DELAY_MS;
+}
+
 const RESUME_REWIND_BYTES = 256 * 1024;
 
 const REALDEBRID_TOTAL_MISMATCH_TOLERANCE_BYTES = 64 * 1024;
@@ -363,6 +374,7 @@ type DownloadManagerOptions = {
   bestDebridWebUnrestrict?: BestDebridWebUnrestrictor;
   invalidateMegaSession?: () => void;
   onHistoryEntry?: HistoryEntryCallback;
+  protectEmptyClobber?: boolean;
 };
 
 function generateHistoryId(): string {
@@ -659,6 +671,33 @@ export function parseMegaDebridCooldownRetry(errorText: string): { delayMs: numb
   return { delayMs, detail: text.replace(/mega_debrid_cooldown:\d+:/i, "").trim() };
 }
 
+export function parseMegaDebridSlowLinkRetry(errorText: string): { delayMs: number; detail: string } | null {
+  const text = String(errorText || "");
+  const match = text.match(/mega_debrid_slow_link:(\d+)/i);
+  if (!match) {
+    return null;
+  }
+  const raw = Number(match[1]);
+  if (!Number.isFinite(raw) || raw <= 0) {
+    return null;
+  }
+  const delayMs = Math.max(1000, Math.min(15 * 60 * 1000, raw));
+  return { delayMs, detail: text.replace(/mega_debrid_slow_link:\d+:/i, "").trim() };
+}
+
+export function parseMegaDebridResetPark(errorText: string): { delayMs: number; detail: string } | null {
+  const match = String(errorText || "").match(/mega_debrid_reset_park:(\d+):(.*)$/is);
+  if (!match) {
+    return null;
+  }
+  const raw = Number(match[1]);
+  if (!Number.isFinite(raw) || raw <= 0) {
+    return null;
+  }
+  const delayMs = Math.max(1000, Math.min(26 * 60 * 60 * 1000, raw));
+  return { delayMs, detail: String(match[2] || "").trim() };
+}
+
 function parseDebridLinkTerminalFailure(errorText: string): { kind: "invalid_all" | "no_active_key"; detail: string } | null {
   const raw = String(errorText || "");
   const match = raw.match(/debrid_link_(invalid_all|no_active_key):(.*)$/i);
@@ -1675,6 +1714,10 @@ export class DownloadManager extends EventEmitter {
 
   public blockAllPersistence = false;
 
+  private protectAgainstEmptyClobber = false;
+
+  private emptyClobberProtectionLogged = false;
+
   private debridService: DebridService;
 
   private invalidateMegaSessionFn?: () => void;
@@ -1797,6 +1840,8 @@ export class DownloadManager extends EventEmitter {
     unrestrictRetries: number;
   }>();
 
+  private http416FreshRestartByItem = new Map<string, number>();
+
   private providerFailures = new Map<string, { count: number; lastFailAt: number; cooldownUntil: number }>();
 
   private allDebridHostInfoCache = new Map<string, { info: AllDebridHostInfo; cachedAt: number }>();
@@ -1818,6 +1863,10 @@ export class DownloadManager extends EventEmitter {
     this.session = session;
     this.itemCount = Object.keys(this.session.items).length;
     this.storagePaths = storagePaths;
+    this.protectAgainstEmptyClobber = Boolean(options.protectEmptyClobber);
+    if (this.protectAgainstEmptyClobber) {
+      logger.warn("Session-Schutz aktiv: Start mit unlesbarer Session — leere Speicherungen blockiert, bis echte Daten vorliegen");
+    }
     this.debridService = new DebridService(settings, {
       megaWebUnrestrict: options.megaWebUnrestrict,
       allDebridWebUnrestrict: options.allDebridWebUnrestrict,
@@ -2975,6 +3024,14 @@ export class DownloadManager extends EventEmitter {
         continue;
       }
 
+      const hasOwnCompletedOutput = pkg.itemIds.some((itemId) => {
+        const item = this.session.items[itemId];
+        return Boolean(item && item.status === "completed");
+      });
+      if (hasOwnCompletedOutput) {
+        continue;
+      }
+
       if (!this.isPackageSpecificExtractDir(pkg)) {
         continue;
       }
@@ -5526,7 +5583,7 @@ export class DownloadManager extends EventEmitter {
     });
   }
 
-  public async start(): Promise<void> {
+  public async start(options?: { excludePackageIds?: ReadonlySet<string> }): Promise<void> {
     if (this.session.running) {
       return;
     }
@@ -5567,6 +5624,9 @@ export class DownloadManager extends EventEmitter {
         if (item.status !== "queued" && item.status !== "reconnect_wait") {
           return false;
         }
+        if (options?.excludePackageIds?.has(item.packageId)) {
+          return false;
+        }
         const pkg = this.session.packages[item.packageId];
         return Boolean(pkg && !pkg.cancelled && pkg.enabled);
       });
@@ -5631,9 +5691,15 @@ export class DownloadManager extends EventEmitter {
     this.providerStartReservations.clear();
     this.pacedStartReservationByItem.clear();
     this.retryStateByItem.clear();
+    this.http416FreshRestartByItem.clear();
     this.itemContributedBytes.clear();
     this.reservedTargetPaths.clear();
     this.claimedTargetPathByItem.clear();
+    if (options?.excludePackageIds) {
+      for (const excluded of options.excludePackageIds) {
+        this.runPackageIds.delete(excluded);
+      }
+    }
 
     this.session.running = true;
     this.session.paused = false;
@@ -5808,7 +5874,9 @@ export class DownloadManager extends EventEmitter {
       const itemCount = Object.keys(this.session.items).length;
       logger.info(`Shutdown-Save: ${pkgCount} Pakete, ${itemCount} Items`);
       this.foldRuntimeIntoSettings(nowMs());
-      saveSession(this.storagePaths, this.session);
+      if (!this.guardBlocksSessionSave()) {
+        saveSession(this.storagePaths, this.session);
+      }
       saveSettings(this.storagePaths, this.settings);
     } else {
       logger.info(`Shutdown-Save übersprungen: skipShutdownPersist=${this.skipShutdownPersist}, blockAllPersistence=${this.blockAllPersistence}`);
@@ -6111,10 +6179,29 @@ export class DownloadManager extends EventEmitter {
     }, delay);
   }
 
+  private guardBlocksSessionSave(): boolean {
+    if (!this.protectAgainstEmptyClobber) {
+      return false;
+    }
+    const isEmpty = Object.keys(this.session.packages).length === 0 && Object.keys(this.session.items).length === 0;
+    if (isEmpty) {
+      if (!this.emptyClobberProtectionLogged) {
+        logger.warn("Leere Session-Speicherung uebersprungen (Schutz nach unlesbarem Start) — vorhandene Datei bleibt unangetastet");
+        this.emptyClobberProtectionLogged = true;
+      }
+      return true;
+    }
+    this.protectAgainstEmptyClobber = false;
+    logger.info("Session-Schutz aufgehoben: nicht-leere Session wird wieder normal gespeichert");
+    return false;
+  }
+
   private persistNow(): void {
     const now = nowMs();
     this.lastPersistAt = now;
-    void saveSessionAsync(this.storagePaths, this.session).catch((err) => logger.warn(`saveSessionAsync Fehler: ${compactErrorText(err)}`));
+    if (!this.guardBlocksSessionSave()) {
+      void saveSessionAsync(this.storagePaths, this.session).catch((err) => logger.warn(`saveSessionAsync Fehler: ${compactErrorText(err)}`));
+    }
     if (now - this.lastSettingsPersistAt >= 30000) {
       this.foldRuntimeIntoSettings(now);
       this.lastSettingsPersistAt = now;
@@ -6128,7 +6215,9 @@ export class DownloadManager extends EventEmitter {
     const itemCount = Object.keys(this.session.items).length;
     logger.info(`Pre-Update Sync-Save: ${pkgCount} Pakete, ${itemCount} Items`);
     this.foldRuntimeIntoSettings(nowMs());
-    saveSession(this.storagePaths, this.session);
+    if (!this.guardBlocksSessionSave()) {
+      saveSession(this.storagePaths, this.session);
+    }
     saveSettings(this.storagePaths, this.settings);
   }
 
@@ -8137,7 +8226,13 @@ export class DownloadManager extends EventEmitter {
     const provider = resolveMegaDebridProvider(this.settings, this.getExpectedProviderForItem(item));
     const serializedValidatingLimit = this.getSerializedValidatingLimit(provider);
     if (provider && Number.isFinite(serializedValidatingLimit) && serializedValidatingLimit < Number.MAX_SAFE_INTEGER) {
-      return this.getProviderValidatingTaskCount(provider, item.id) >= serializedValidatingLimit;
+      const validating = this.getProviderValidatingTaskCount(provider, item.id);
+      if (provider === "megadebrid-api") {
+        const webInFlight = getMegaDebridInFlightCountForMode("web");
+        const overlapAllowance = Math.min(serializedValidatingLimit, webInFlight);
+        return validating >= serializedValidatingLimit + overlapAllowance;
+      }
+      return validating >= serializedValidatingLimit;
     }
     if (provider !== "alldebrid") {
       return false;
@@ -8646,6 +8741,53 @@ export class DownloadManager extends EventEmitter {
     this.queueRetry(item, active, delayMs, `HTTP 416 erkannt, Retry ${active.genericErrorRetries}/${retryDisplayLimit}`);
   }
 
+  private escalateHttp416OrFail(item: DownloadItem, active: ActiveTask, claimedTargetPath: string, errorText: string): void {
+    const freshRestarts = this.http416FreshRestartByItem.get(item.id) || 0;
+    if (freshRestarts < MAX_HTTP416_FRESH_RESTARTS) {
+      this.http416FreshRestartByItem.set(item.id, freshRestarts + 1);
+      const resetTargetPath = claimedTargetPath || String(item.targetPath || "").trim();
+      if (resetTargetPath) {
+        try {
+          fs.rmSync(resetTargetPath, { force: true });
+        } catch {
+        }
+      }
+      this.releaseTargetPath(item.id);
+      this.dropItemContribution(item.id);
+      item.retries += 1;
+      item.downloadedBytes = 0;
+      item.totalBytes = null;
+      item.progressPercent = 0;
+      item.speedBps = 0;
+      item.lastError = "";
+      active.genericErrorRetries = 0;
+      active.freshRetryUsed = false;
+      active.resumeHardResetUsed = false;
+      logger.warn(
+        `HTTP 416 Budget erschöpft: item=${item.fileName || item.id}, ` +
+        `kompletter Neu-Download ${freshRestarts + 1}/${MAX_HTTP416_FRESH_RESTARTS} (Partial verworfen, kein Resume), provider=${item.provider || "?"}`
+      );
+      this.queueRetry(item, active, getHttp416FreshRestartDelayMs(), `Range-Konflikt (HTTP 416): Neu-Download ${freshRestarts + 1}/${MAX_HTTP416_FRESH_RESTARTS}`);
+      this.persistSoon();
+      this.emitState();
+      return;
+    }
+    this.http416FreshRestartByItem.delete(item.id);
+    item.status = "failed";
+    this.recordRunOutcome(item.id, "failed");
+    item.lastError = errorText;
+    item.fullStatus = `Fehler: ${item.lastError}`;
+    item.speedBps = 0;
+    item.updatedAt = nowMs();
+    const failPkg = this.session.packages[item.packageId];
+    if (failPkg) {
+      this.refreshPackageStatus(failPkg);
+    }
+    this.persistSoon();
+    this.emitState();
+    this.retryStateByItem.delete(item.id);
+  }
+
   private startItem(packageId: string, itemId: string): void {
     const item = this.session.items[itemId];
     const pkg = this.session.packages[packageId];
@@ -8771,6 +8913,7 @@ export class DownloadManager extends EventEmitter {
         }
         const cooldownProvider = this.getProviderFailureKeyForItem(item);
         const cooldownMs = this.getProviderCooldownRemaining(cooldownProvider);
+        let preferredLeadProvider: DebridProvider | null = null;
         if (cooldownMs > 0) {
           if (this.settings.autoProviderFallback) {
             const fallback = this.findFallbackProviderNotInCooldown(item);
@@ -8782,6 +8925,7 @@ export class DownloadManager extends EventEmitter {
                 fallback
               });
               item.provider = null;
+              preferredLeadProvider = fallback;
             } else {
               this.logPackageForItem(item, "WARN", "Provider-Cooldown blockiert Unrestrict", {
                 provider: cooldownProvider,
@@ -8825,7 +8969,7 @@ export class DownloadManager extends EventEmitter {
               traceConversionNote("slots", this.describeSlotOccupancy());
               traceConversionNote("retry", Number(active.unrestrictRetries || 0));
               try {
-                return await this.debridService.unrestrictLink(item.url, unrestrictedSignal);
+                return await this.debridService.unrestrictLink(item.url, unrestrictedSignal, undefined, preferredLeadProvider);
               } catch (innerError) {
                 if (!active.abortController.signal.aborted && unrestrictTimeoutSignal.aborted) {
                   traceConversionPhase({
@@ -8961,7 +9105,6 @@ export class DownloadManager extends EventEmitter {
               if (item.attempts < maxAttempts) {
                 item.status = "integrity_check";
                 item.progressPercent = 0;
-                this.dropItemContribution(item.id);
                 item.downloadedBytes = 0;
                 item.totalBytes = unrestricted.fileSize;
                 this.emitState();
@@ -9002,7 +9145,6 @@ export class DownloadManager extends EventEmitter {
             } catch {
             }
             this.releaseTargetPath(item.id);
-            this.dropItemContribution(item.id);
             item.downloadedBytes = 0;
             item.progressPercent = 0;
             item.totalBytes = (item.totalBytes || 0) > 0 ? item.totalBytes : null;
@@ -9150,6 +9292,20 @@ export class DownloadManager extends EventEmitter {
           const totalFailures = (active.stallRetries || 0) + (active.unrestrictRetries || 0) + (active.genericErrorRetries || 0);
           if (totalFailures >= 15) {
             item.retries += 1;
+            if (configuredRetryLimit > 0 && item.retries >= configuredRetryLimit) {
+              item.status = "failed";
+              item.lastError = stallErrorText || "Wiederholt fehlgeschlagen";
+              item.fullStatus = `Fehler: ${item.lastError}`;
+              item.speedBps = 0;
+              item.updatedAt = nowMs();
+              this.recordRunOutcome(item.id, "failed");
+              this.retryStateByItem.delete(item.id);
+              const shelveFailPkgStall = this.session.packages[item.packageId];
+              if (shelveFailPkgStall) this.refreshPackageStatus(shelveFailPkgStall);
+              this.persistSoon();
+              this.emitState();
+              return;
+            }
             active.stallRetries = Math.floor((active.stallRetries || 0) / 2);
             active.unrestrictRetries = Math.floor((active.unrestrictRetries || 0) / 2);
             active.genericErrorRetries = Math.floor((active.genericErrorRetries || 0) / 2);
@@ -9222,10 +9378,14 @@ export class DownloadManager extends EventEmitter {
                 return;
               }
             }
-            if (isHttp416Text(exhaustedReason) && active.genericErrorRetries < maxHttp416Retries) {
-              this.scheduleHttp416Retry(item, active, retryDisplayLimit, exhaustedReason, claimedTargetPath);
-              this.persistSoon();
-              this.emitState();
+            if (isHttp416Text(exhaustedReason)) {
+              if (active.genericErrorRetries < maxHttp416Retries) {
+                this.scheduleHttp416Retry(item, active, retryDisplayLimit, exhaustedReason, claimedTargetPath);
+                this.persistSoon();
+                this.emitState();
+                return;
+              }
+              this.escalateHttp416OrFail(item, active, claimedTargetPath, exhaustedReason);
               return;
             }
             if (isResumeHardResetReason(exhaustedReason) && !active.resumeHardResetUsed) {
@@ -9282,17 +9442,7 @@ export class DownloadManager extends EventEmitter {
               this.emitState();
               return;
             }
-            item.status = "failed";
-            this.recordRunOutcome(item.id, "failed");
-            item.lastError = errorText;
-            item.fullStatus = `Fehler: ${item.lastError}`;
-            item.speedBps = 0;
-            item.updatedAt = nowMs();
-            const failPkg416 = this.session.packages[item.packageId];
-            if (failPkg416) this.refreshPackageStatus(failPkg416);
-            this.persistSoon();
-            this.emitState();
-            this.retryStateByItem.delete(item.id);
+            this.escalateHttp416OrFail(item, active, claimedTargetPath, errorText);
             return;
           }
           if (shouldFreshRetry) {
@@ -9336,6 +9486,20 @@ export class DownloadManager extends EventEmitter {
           const totalNonStallFailures = (active.stallRetries || 0) + (active.unrestrictRetries || 0) + (active.genericErrorRetries || 0);
           if (totalNonStallFailures >= 15) {
             item.retries += 1;
+            if (configuredRetryLimit > 0 && item.retries >= configuredRetryLimit) {
+              item.status = "failed";
+              item.lastError = errorText || "Wiederholt fehlgeschlagen";
+              item.fullStatus = `Fehler: ${item.lastError}`;
+              item.speedBps = 0;
+              item.updatedAt = nowMs();
+              this.recordRunOutcome(item.id, "failed");
+              this.retryStateByItem.delete(item.id);
+              const shelveFailPkgErr = this.session.packages[item.packageId];
+              if (shelveFailPkgErr) this.refreshPackageStatus(shelveFailPkgErr);
+              this.persistSoon();
+              this.emitState();
+              return;
+            }
             active.stallRetries = Math.floor((active.stallRetries || 0) / 2);
             active.unrestrictRetries = Math.floor((active.unrestrictRetries || 0) / 2);
             active.genericErrorRetries = Math.floor((active.genericErrorRetries || 0) / 2);
@@ -9393,7 +9557,26 @@ export class DownloadManager extends EventEmitter {
             return;
           }
 
-          const megaCooldownRetry = parseMegaDebridCooldownRetry(errorText);
+          const megaRawError = error instanceof Error ? String(error.message || "") : String(error || "");
+          const megaSlowLinkRetry = parseMegaDebridSlowLinkRetry(megaRawError);
+          if (megaSlowLinkRetry && active.unrestrictRetries < maxUnrestrictRetries) {
+            active.unrestrictRetries += 1;
+            item.retries += 1;
+            item.provider = null;
+            logger.warn(`Mega-Debrid Link langsam (Timeout): item=${item.fileName || item.id}, retry=${active.unrestrictRetries}/${retryDisplayLimit}, delay=${megaSlowLinkRetry.delayMs}ms, link=${item.url.slice(0, 80)}`);
+            this.queueRetry(
+              item,
+              active,
+              megaSlowLinkRetry.delayMs,
+              `Mega-Debrid: Link zu langsam, Einzel-Retry in ${Math.ceil(megaSlowLinkRetry.delayMs / 1000)}s`
+            );
+            item.lastError = megaSlowLinkRetry.detail || errorText;
+            this.persistSoon();
+            this.emitState();
+            return;
+          }
+
+          const megaCooldownRetry = parseMegaDebridCooldownRetry(megaRawError);
           if (megaCooldownRetry && active.unrestrictRetries < maxUnrestrictRetries) {
             active.unrestrictRetries += 1;
             item.retries += 1;
@@ -9410,6 +9593,23 @@ export class DownloadManager extends EventEmitter {
             return;
           }
 
+          const megaResetPark = parseMegaDebridResetPark(megaRawError);
+          if (megaResetPark && active.unrestrictRetries < maxUnrestrictRetries) {
+            active.unrestrictRetries += 1;
+            item.retries += 1;
+            logger.warn(`Mega-Debrid bis Tagesreset gesperrt: item=${item.fileName || item.id}, retry=${active.unrestrictRetries}/${retryDisplayLimit}, delay=${megaResetPark.delayMs}ms, link=${item.url.slice(0, 80)}`);
+            this.queueRetry(
+              item,
+              active,
+              megaResetPark.delayMs,
+              `Mega-Debrid bis Tagesreset gesperrt, Pause ${Math.ceil(megaResetPark.delayMs / 1000)}s`
+            );
+            item.lastError = megaResetPark.detail || errorText;
+            this.persistSoon();
+            this.emitState();
+            return;
+          }
+
           if (isMegaDebridTransientResolveFailure(errorText) && active.unrestrictRetries < maxUnrestrictRetries) {
             active.unrestrictRetries += 1;
             item.retries += 1;
@@ -9573,6 +9773,7 @@ export class DownloadManager extends EventEmitter {
           await fs.promises.truncate(effectiveTargetPath, resumeStart);
           existingBytes = resumeStart;
           item.downloadedBytes = Math.min(item.downloadedBytes, existingBytes);
+          resumeRewindBytesNextAttempt = 0;
           logAttemptEvent("WARN", "Resume-Schutz aktiv: Teil-Datei vor Retry zurueckgespult", {
             attempt,
             previousBytes,
@@ -9586,8 +9787,6 @@ export class DownloadManager extends EventEmitter {
             rewindBytes,
             error: compactErrorText(rewindError)
           });
-        } finally {
-          resumeRewindBytesNextAttempt = 0;
         }
       } else if (resumeRewindBytesNextAttempt > 0) {
         resumeRewindBytesNextAttempt = 0;
@@ -9933,6 +10132,7 @@ export class DownloadManager extends EventEmitter {
           if (previouslyContributed > 0) {
             this.session.totalDownloadedBytes = Math.max(0, this.session.totalDownloadedBytes - previouslyContributed);
             this.sessionDownloadedBytes = Math.max(0, this.sessionDownloadedBytes - previouslyContributed);
+            this.settings.totalDownloadedAllTime = Math.max(0, Number(this.settings.totalDownloadedAllTime || 0) - previouslyContributed);
             this.itemContributedBytes.set(active.itemId, 0);
           }
           if (existingBytes > 0) {
@@ -10423,7 +10623,6 @@ export class DownloadManager extends EventEmitter {
                 await fs.promises.rm(effectiveTargetPath, { force: true });
               } catch {  }
               this.releaseTargetPath(active.itemId);
-              this.dropItemContribution(active.itemId);
               item.downloadedBytes = 0;
               item.progressPercent = 0;
               throw new Error(`Download zu klein (${written} B) – Hoster-Fehlerseite?${snippet ? ` Inhalt: "${snippet}"` : ""}`);
@@ -10533,6 +10732,34 @@ export class DownloadManager extends EventEmitter {
           await sleep(retryDelayWithJitter(attempt, 250));
           continue;
         }
+        if (
+          item.totalBytes != null && item.totalBytes > 0
+          && written > existingBytes
+          && shouldRewindResumeTail(normalizedLastError)
+        ) {
+          const rewindTarget = Math.max(0, written - RESUME_REWIND_BYTES);
+          item.downloadedBytes = Math.min(item.downloadedBytes, rewindTarget);
+          try {
+            await fs.promises.truncate(effectiveTargetPath, rewindTarget);
+            logAttemptEvent("WARN", "Resume-Schutz: letzter Versuch vor Linkerneuerung zurueckgespult", {
+              attempt,
+              written,
+              rewindTarget
+            });
+          } catch (rewindError) {
+            try {
+              fs.rmSync(effectiveTargetPath, { force: true });
+              item.downloadedBytes = 0;
+            } catch {
+            }
+            logAttemptEvent("WARN", "Resume-Schutz: finales Rueckspulen fehlgeschlagen, Teil-Datei verworfen", {
+              attempt,
+              written,
+              rewindTarget,
+              error: compactErrorText(rewindError)
+            });
+          }
+        }
         if (maxAttemptsBySetting > maxAttempts) {
           const exhaustedError = existingBytes > 0 && normalizedLastError.startsWith("download_underflow:")
             ? `resume_download_underflow:${normalizedLastError.slice("download_underflow:".length)}`

src/main/main.ts

@@ -1,7 +1,7 @@
 import fs from "node:fs";
 import path from "node:path";
 import { app, BrowserWindow, clipboard, dialog, ipcMain, IpcMainInvokeEvent, Menu, shell, Tray } from "electron";
-import { AddLinksPayload, AppSettings, DebridProvider, UpdateInstallProgress } from "../shared/types";
+import { AddLinksPayload, AppSettings, DebridProvider, EnableRemoteDiagnosticsInput, UpdateInstallProgress } from "../shared/types";
 import { AppController } from "./app-controller";
 import { IPC_CHANNELS } from "../shared/ipc";
 import { getLogFilePath, logger } from "./logger";
@@ -571,7 +571,7 @@ function registerIpcHandlers(): void {
 
   ipcMain.handle(IPC_CHANNELS.EXPORT_BACKUP, async () => {
     const options = {
-      defaultPath: `mdd-backup-${new Date().toISOString().slice(0, 10)}.mdd`,
+      defaultPath: `${new Date().toISOString().slice(0, 10).split("-").reverse().join("-")}-mdd-backup.mdd`,
       filters: [{ name: "MDD Backup", extensions: ["mdd"] }]
     };
     const result = mainWindow ? await dialog.showSaveDialog(mainWindow, options) : await dialog.showSaveDialog(options);
@@ -671,6 +671,33 @@ function registerIpcHandlers(): void {
     return { path: rotated.path };
   });
 
+  ipcMain.handle(IPC_CHANNELS.GET_REMOTE_DIAGNOSTICS, async () => {
+    return controller.getRemoteDiagnostics();
+  });
+
+  ipcMain.handle(IPC_CHANNELS.ENABLE_REMOTE_DIAGNOSTICS, async (_event: IpcMainInvokeEvent, input: EnableRemoteDiagnosticsInput) => {
+    if (!input || (input.hostMode !== "local" && input.hostMode !== "network")) {
+      throw new Error("hostMode muss 'local' oder 'network' sein");
+    }
+    const allowlist = Array.isArray(input.allowlist) ? input.allowlist.map((entry) => String(entry)) : [];
+    return controller.enableRemoteDiagnostics({
+      hostMode: input.hostMode,
+      publicHost: String(input.publicHost || ""),
+      port: input.port ? Number(input.port) : undefined,
+      allowlist,
+      name: input.name ? String(input.name) : undefined,
+      rotateToken: Boolean(input.rotateToken)
+    });
+  });
+
+  ipcMain.handle(IPC_CHANNELS.DISABLE_REMOTE_DIAGNOSTICS, async () => {
+    return controller.disableRemoteDiagnostics();
+  });
+
+  ipcMain.handle(IPC_CHANNELS.ROTATE_REMOTE_DIAGNOSTICS_TOKEN, async () => {
+    return controller.rotateRemoteDiagnosticsToken();
+  });
+
   ipcMain.handle(IPC_CHANNELS.OPEN_ITEM_LOG, async (_event: IpcMainInvokeEvent, itemId: string) => {
     validateString(itemId, "itemId");
     const logPath = controller.getItemLogPath(itemId);

src/main/mega-web-fallback.ts

@@ -177,12 +177,12 @@ async function sleepWithSignal(ms: number, signal?: AbortSignal): Promise<void>
   });
 }
 
-async function raceWithAbort<T>(promise: Promise<T>, signal?: AbortSignal): Promise<T> {
+async function raceWithAbort<T>(promise: Promise<T>, signal?: AbortSignal, abortErrorFactory: () => Error = abortError): Promise<T> {
   if (!signal) {
     return promise;
   }
   if (signal.aborted) {
-    throw abortError();
+    throw abortErrorFactory();
   }
 
   return new Promise<T>((resolve, reject) => {
@@ -194,7 +194,7 @@ async function raceWithAbort<T>(promise: Promise<T>, signal?: AbortSignal): Prom
       }
       settled = true;
       signal.removeEventListener("abort", onAbort);
-      reject(abortError());
+      reject(abortErrorFactory());
     };
 
     signal.addEventListener("abort", onAbort, { once: true });
@@ -284,6 +284,7 @@ export class MegaWebFallback {
   private async runExclusive<T>(job: () => Promise<T>, key: string, signal?: AbortSignal): Promise<T> {
     const queuedAt = Date.now();
     const QUEUE_WAIT_TIMEOUT_MS = 90000;
+    let workStarted = false;
     const guardedJob = async (): Promise<T> => {
       throwIfAborted(signal);
       const waited = Date.now() - queuedAt;
@@ -291,6 +292,7 @@ export class MegaWebFallback {
         traceConversionPhase({ phase: "web-queue", provider: "megadebrid-web", queueWaitMs: waited, outcome: "queue-timeout", detail: `${Math.floor(waited / 1000)}s in Web-Queue gewartet` });
         throw new Error(`Mega-Web Queue-Timeout (${Math.floor(waited / 1000)}s gewartet)`);
       }
+      workStarted = true;
       const workStartedAt = Date.now();
       try {
         const result = await job();
@@ -304,7 +306,11 @@ export class MegaWebFallback {
     const prev = this.queues.get(key) ?? Promise.resolve();
     const run = prev.then(guardedJob, guardedJob);
     this.queues.set(key, run.then(() => undefined, () => undefined));
-    return raceWithAbort(run, signal);
+    return raceWithAbort(run, signal, () =>
+      workStarted
+        ? abortError()
+        : new Error(`Mega-Web Queue-Timeout (abgebrochen nach ${Math.floor((Date.now() - queuedAt) / 1000)}s Wartezeit, Account war belegt)`)
+    );
   }
 
   private async login(login: string, password: string, signal?: AbortSignal): Promise<string> {

src/main/storage.ts

@@ -461,6 +461,7 @@ export function normalizeSettings(settings: AppSettings): AppSettings {
     hideExtractedItems: settings.hideExtractedItems !== undefined ? Boolean(settings.hideExtractedItems) : defaults.hideExtractedItems,
     confirmDeleteSelection: settings.confirmDeleteSelection !== undefined ? Boolean(settings.confirmDeleteSelection) : defaults.confirmDeleteSelection,
     backupIncludeDownloads: settings.backupIncludeDownloads !== undefined ? Boolean(settings.backupIncludeDownloads) : defaults.backupIncludeDownloads,
+    backupIncludeMcp: settings.backupIncludeMcp !== undefined ? Boolean(settings.backupIncludeMcp) : defaults.backupIncludeMcp,
     notifyUrl: asText(settings.notifyUrl) || defaults.notifyUrl,
     notifyMention: asText(settings.notifyMention) || defaults.notifyMention,
     notifyOnPackageCompleted: settings.notifyOnPackageCompleted !== undefined ? Boolean(settings.notifyOnPackageCompleted) : defaults.notifyOnPackageCompleted,
@@ -627,12 +628,24 @@ function normalizeAudioStripSummary(raw: unknown): AudioStripSummary | undefined
   };
 }
 
+function migrateLegacyMegaEnableFlags(parsed: AppSettings): AppSettings {
+  if (parsed.megaDebridApiEnabled !== undefined || parsed.megaDebridWebEnabled !== undefined) {
+    return parsed;
+  }
+  const hasMegaCreds = Boolean(asText(parsed.megaLogin) && asText(parsed.megaPassword));
+  if (!hasMegaCreds) {
+    return parsed;
+  }
+  const preferApi = parsed.megaDebridPreferApi !== undefined ? Boolean(parsed.megaDebridPreferApi) : true;
+  return { ...parsed, megaDebridApiEnabled: preferApi, megaDebridWebEnabled: !preferApi };
+}
+
 function readSettingsFile(filePath: string): AppSettings | null {
   try {
     const parsed = JSON.parse(fs.readFileSync(filePath, "utf8")) as AppSettings;
     const merged = normalizeSettings({
       ...defaultSettings(),
-      ...parsed
+      ...migrateLegacyMegaEnableFlags(parsed)
     });
     return sanitizeCredentialPersistence(merged);
   } catch (error) {
@@ -877,21 +890,50 @@ export function normalizeLoadedSessionTransientFields(session: SessionState): Se
   return session;
 }
 
+const TRANSIENT_READ_CODES = new Set(["EBUSY", "EPERM", "EAGAIN"]);
+
+function sleepSyncMs(ms: number): void {
+  if (ms <= 0) {
+    return;
+  }
+  Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, ms);
+}
+
 function readSessionFile(filePath: string): SessionState | null {
+  let raw: string | null = null;
+  const maxAttempts = 5;
+  for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
+    try {
+      raw = fs.readFileSync(filePath, "utf8");
+      break;
+    } catch (error) {
+      const code = (error as NodeJS.ErrnoException)?.code || "";
+      if (TRANSIENT_READ_CODES.has(code) && attempt < maxAttempts) {
+        const backoffMs = 100 * 2 ** (attempt - 1);
+        logger.warn(`Session-Datei vorübergehend gesperrt (${code}), Versuch ${attempt}/${maxAttempts}, warte ${backoffMs}ms: ${filePath}`);
+        sleepSyncMs(backoffMs);
+        continue;
+      }
+      if (code === "EACCES" || code === "EPERM") {
+        logger.error(`Session-Datei nicht zugreifbar (${code}): ${filePath} - pruefe Datei-/Ordner-Berechtigungen fuer Benutzer ${process.env.USERNAME || process.env.USER || "?"}`);
+      } else {
+        logger.error(`Session-Datei nicht lesbar (${code || "?"}): ${filePath}: ${String(error)}`);
+      }
+      return null;
+    }
+  }
+  if (raw === null) {
+    return null;
+  }
   try {
-    const parsed = JSON.parse(fs.readFileSync(filePath, "utf8")) as unknown;
+    const parsed = JSON.parse(raw) as unknown;
     const session = normalizeLoadedSessionTransientFields(normalizeLoadedSession(parsed));
     const pkgCount = Object.keys(session.packages).length;
     const itemCount = Object.keys(session.items).length;
     logger.info(`Session geladen: ${filePath} (${pkgCount} Pakete, ${itemCount} Items)`);
     return session;
   } catch (error) {
-    const code = (error as NodeJS.ErrnoException)?.code || "";
-    if (code === "EACCES" || code === "EPERM") {
-      logger.error(`Session-Datei nicht zugreifbar (${code}): ${filePath} - pruefe Datei-/Ordner-Berechtigungen fuer Benutzer ${process.env.USERNAME || process.env.USER || "?"}`);
-    } else {
-      logger.error(`Session-Datei nicht lesbar: ${filePath}: ${String(error)}`);
-    }
+    logger.error(`Session-Datei beschädigt (JSON ungültig): ${filePath}: ${String(error)}`);
     return null;
   }
 }
@@ -991,17 +1033,31 @@ export function emptySession(): SessionState {
   };
 }
 
-export function loadSession(paths: StoragePaths): SessionState {
+export type SessionLoadStatus =
+  | "ok"
+  | "recovered-backup"
+  | "recovered-temp"
+  | "empty-fresh"
+  | "empty-unreadable";
+
+export interface SessionLoadResult {
+  session: SessionState;
+  status: SessionLoadStatus;
+}
+
+export function loadSessionWithStatus(paths: StoragePaths): SessionLoadResult {
   ensureBaseDir(paths.baseDir);
   const backupFile = sessionBackupPath(paths.sessionFile);
+  const syncTempFile = sessionTempPath(paths.sessionFile, "sync");
+  const asyncTempFile = sessionTempPath(paths.sessionFile, "async");
   const primaryExists = fs.existsSync(paths.sessionFile);
+  const backupExists = fs.existsSync(backupFile);
+  const anyTempExists = fs.existsSync(syncTempFile) || fs.existsSync(asyncTempFile);
+
   if (!primaryExists) {
-    const hasRecoverable = fs.existsSync(backupFile)
-      || fs.existsSync(sessionTempPath(paths.sessionFile, "sync"))
-      || fs.existsSync(sessionTempPath(paths.sessionFile, "async"));
-    if (!hasRecoverable) {
+    if (!backupExists && !anyTempExists) {
       logger.info("Keine Session-Datei vorhanden, starte mit leerer Session");
-      return emptySession();
+      return { session: emptySession(), status: "empty-fresh" };
     }
     logger.warn("Session-Primaerdatei fehlt, aber Backup/Temp vorhanden — Wiederherstellung wird versucht");
   }
@@ -1010,7 +1066,7 @@ export function loadSession(paths: StoragePaths): SessionState {
 
   if (primary) {
     const primaryPkgCount = Object.keys(primary.packages).length;
-    if (primaryPkgCount === 0 && fs.existsSync(backupFile)) {
+    if (primaryPkgCount === 0 && backupExists) {
       const backup = readSessionFile(backupFile);
       if (backup) {
         const backupPkgCount = Object.keys(backup.packages).length;
@@ -1018,29 +1074,27 @@ export function loadSession(paths: StoragePaths): SessionState {
           logger.warn(`Session-Datei ist leer (0 Pakete), aber Backup hat ${backupPkgCount} Pakete — verwende Backup`);
           try {
             const payload = JSON.stringify({ ...backup, updatedAt: Date.now() }, safeJsonReplacer);
-            const tempPath = sessionTempPath(paths.sessionFile, "sync");
-            fs.writeFileSync(tempPath, payload, "utf8");
-            syncRenameWithExdevFallback(tempPath, paths.sessionFile);
+            fs.writeFileSync(syncTempFile, payload, "utf8");
+            syncRenameWithExdevFallback(syncTempFile, paths.sessionFile);
           } catch {
           }
-          return backup;
+          return { session: backup, status: "recovered-backup" };
         }
       }
     }
-    return primary;
+    return { session: primary, status: "ok" };
   }
 
-  const backup = fs.existsSync(backupFile) ? readSessionFile(backupFile) : null;
+  const backup = backupExists ? readSessionFile(backupFile) : null;
   if (backup) {
     logger.warn("Session defekt, Backup-Datei wird verwendet");
     try {
       const payload = JSON.stringify({ ...backup, updatedAt: Date.now() }, safeJsonReplacer);
-      const tempPath = sessionTempPath(paths.sessionFile, "sync");
-      fs.writeFileSync(tempPath, payload, "utf8");
-      syncRenameWithExdevFallback(tempPath, paths.sessionFile);
+      fs.writeFileSync(syncTempFile, payload, "utf8");
+      syncRenameWithExdevFallback(syncTempFile, paths.sessionFile);
     } catch {
     }
-    return backup;
+    return { session: backup, status: "recovered-backup" };
   }
 
   for (const kind of ["sync", "async"] as const) {
@@ -1054,13 +1108,21 @@ export function loadSession(paths: StoragePaths): SessionState {
           fs.writeFileSync(paths.sessionFile, payload, "utf8");
         } catch {
         }
-        return tmpSession;
+        return { session: tmpSession, status: "recovered-temp" };
       }
     }
   }
 
-  logger.error("Session konnte nicht geladen werden (Primary, Backup und Temp-Dateien fehlgeschlagen)");
-  return emptySession();
+  if (primaryExists || backupExists || anyTempExists) {
+    logger.error("Session konnte nicht geladen werden (Primary, Backup und Temp-Dateien fehlgeschlagen) — Schutz gegen leeres Ueberschreiben aktiv");
+    return { session: emptySession(), status: "empty-unreadable" };
+  }
+
+  return { session: emptySession(), status: "empty-fresh" };
+}
+
+export function loadSession(paths: StoragePaths): SessionState {
+  return loadSessionWithStatus(paths).session;
 }
 
 export function saveSession(paths: StoragePaths, session: SessionState): void {
@@ -1075,7 +1137,13 @@ export function saveSession(paths: StoragePaths, session: SessionState): void {
   const payload = JSON.stringify({ ...session, updatedAt: Date.now() }, safeJsonReplacer);
   const tempPath = sessionTempPath(paths.sessionFile, "sync");
   try {
-    fs.writeFileSync(tempPath, payload, "utf8");
+    const fd = fs.openSync(tempPath, "w");
+    try {
+      fs.writeSync(fd, payload);
+      fs.fsyncSync(fd);
+    } finally {
+      fs.closeSync(fd);
+    }
     syncRenameWithExdevFallback(tempPath, paths.sessionFile);
   } catch (error) {
     try { fs.rmSync(tempPath, { force: true }); } catch {  }
@@ -1091,7 +1159,13 @@ async function writeSessionPayload(paths: StoragePaths, payload: string, generat
   await fs.promises.mkdir(paths.baseDir, { recursive: true });
   await fsp.copyFile(paths.sessionFile, sessionBackupPath(paths.sessionFile)).catch(() => {});
   const tempPath = sessionTempPath(paths.sessionFile, "async");
-  await fsp.writeFile(tempPath, payload, "utf8");
+  const handle = await fsp.open(tempPath, "w");
+  try {
+    await handle.writeFile(payload, "utf8");
+    await handle.sync();
+  } finally {
+    await handle.close();
+  }
   if (generation < syncSaveGeneration) {
     await fsp.rm(tempPath, { force: true }).catch(() => {});
     return;

src/main/update-install-flow.ts

@@ -0,0 +1,34 @@
+export interface InstallResumeManager {
+  isSessionRunning(): boolean;
+  stop(options: { parkForRestart: boolean }): void;
+  persistNowSync(): void;
+  start(): Promise<void> | void;
+}
+
+export async function runInstallWithResume<T extends { started: boolean }>(
+  manager: InstallResumeManager,
+  doInstall: () => Promise<T>
+): Promise<T> {
+  const wasRunning = manager.isSessionRunning();
+  if (wasRunning) {
+    manager.stop({ parkForRestart: true });
+  }
+  manager.persistNowSync();
+
+  const resumeIfParked = async (): Promise<void> => {
+    if (wasRunning && !manager.isSessionRunning()) {
+      await manager.start();
+    }
+  };
+
+  try {
+    const result = await doInstall();
+    if (!result.started) {
+      await resumeIfParked();
+    }
+    return result;
+  } catch (error) {
+    await resumeIfParked();
+    throw error;
+  }
+}

src/main/video-processor.ts

@@ -104,6 +104,9 @@ function isGermanStream(stream: ProbedAudioStream): boolean {
   // Free-text title fallback (used when the language tag is missing). Full words
   // only — the 2-3 letter codes ger/deu are too ambiguous in a title and would
   // pick the wrong track to keep (which then deletes the real German one).
+  if (lang) {
+    return false;
+  }
   const title = (stream.title || "").toLowerCase();
   return /\b(german|deutsch)\b/.test(title);
 }

src/preload/preload.ts

@@ -7,8 +7,10 @@ import {
   DebridLinkHostLimitInfo,
   DebridProvider,
   DuplicatePolicy,
+  EnableRemoteDiagnosticsInput,
   HistoryEntry,
   PackagePriority,
+  RemoteDiagnosticsInfo,
   RendererErrorReport,
   SessionStats,
   StartConflictEntry,
@@ -74,6 +76,10 @@ const api: ElectronApi = {
   getTraceConfig: () => ipcRenderer.invoke(IPC_CHANNELS.GET_TRACE_CONFIG),
   setTraceEnabled: (enabled: boolean, note?: string, durationMinutes?: number) => ipcRenderer.invoke(IPC_CHANNELS.SET_TRACE_ENABLED, enabled, note, durationMinutes),
   rotateDebugToken: (): Promise<{ path: string }> => ipcRenderer.invoke(IPC_CHANNELS.ROTATE_DEBUG_TOKEN),
+  getRemoteDiagnostics: (): Promise<RemoteDiagnosticsInfo> => ipcRenderer.invoke(IPC_CHANNELS.GET_REMOTE_DIAGNOSTICS),
+  enableRemoteDiagnostics: (input: EnableRemoteDiagnosticsInput): Promise<RemoteDiagnosticsInfo> => ipcRenderer.invoke(IPC_CHANNELS.ENABLE_REMOTE_DIAGNOSTICS, input),
+  disableRemoteDiagnostics: (): Promise<RemoteDiagnosticsInfo> => ipcRenderer.invoke(IPC_CHANNELS.DISABLE_REMOTE_DIAGNOSTICS),
+  rotateRemoteDiagnosticsToken: (): Promise<RemoteDiagnosticsInfo> => ipcRenderer.invoke(IPC_CHANNELS.ROTATE_REMOTE_DIAGNOSTICS_TOKEN),
   openRealDebridLogin: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_REALDEBRID_LOGIN),
   openAllDebridLogin: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_ALLDEBRID_LOGIN),
   importBestDebridCookies: (): Promise<number> => ipcRenderer.invoke(IPC_CHANNELS.IMPORT_BESTDEBRID_COOKIES),

src/renderer/App.tsx

@@ -16,6 +16,7 @@ import type {
   DuplicatePolicy,
   HistoryEntry,
   PackageEntry,
+  RemoteDiagnosticsInfo,
   StartConflictEntry,
   UiSnapshot,
   UpdateCheckResult,
@@ -109,7 +110,7 @@ interface MegaDialogAccount {
   password: string;
 }
 
-interface AccountDialogState {
+export interface AccountDialogState {
   mode: "create" | "edit";
   kind: AccountKind | null;
   token: string;
@@ -647,7 +648,7 @@ function createAccountDialogState(mode: "create" | "edit", kind: AccountKind | n
   }
 }
 
-function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDialogState): AppSettings {
+export function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDialogState): AppSettings {
   if (!dialog.kind) {
     return settings;
   }
@@ -682,7 +683,7 @@ function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDial
       const firstPassword = megaParsed.length > 0 ? megaParsed[0].password : "";
       const validIds = new Set(megaParsed.map((a) => a.id));
       const megaDebridDisabledAccountIds = (dialog.megaDisabledIds || []).filter((id) => validIds.has(id));
-      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridApiEnabled: true, megaDebridPreferApi: true, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
+      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridApiEnabled: true, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
     }
     case "megadebrid-web": {
       const megaSerialized = serializeMegaDebridAccounts(dialog.megaAccounts);
@@ -691,7 +692,7 @@ function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDial
       const firstPassword = megaParsed.length > 0 ? megaParsed[0].password : "";
       const validIds = new Set(megaParsed.map((a) => a.id));
       const megaDebridDisabledAccountIds = (dialog.megaDisabledIds || []).filter((id) => validIds.has(id));
-      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridWebEnabled: true, megaDebridPreferApi: false, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
+      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridWebEnabled: true, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
     }
     case "bestdebrid-api":
       return { ...settings, bestToken: token, bestDebridUseWebLogin: false, providerDailyLimitBytes: nextProviderDailyLimitBytes };
@@ -855,7 +856,7 @@ const emptySnapshot = (): UiSnapshot => ({
     autoReconnect: false, reconnectWaitSeconds: 45, completedCleanupPolicy: "never",
     maxParallel: 4, maxParallelExtract: 2, extractCpuPriority: "high", retryLimit: 0, speedLimitEnabled: false, speedLimitKbps: 0, speedLimitMode: "global",
     updateRepo: "", autoUpdateCheck: true, clipboardWatch: false, minimizeToTray: false,
-    theme: "dark", collapseNewPackages: true, historyRetentionMode: "permanent", historyMaxEntries: 500, historyMaxAgeDays: 0, autoSortPackagesByProgress: true, autoSkipExtracted: false, hideExtractedItems: true, confirmDeleteSelection: true, backupIncludeDownloads: false,
+    theme: "dark", collapseNewPackages: true, historyRetentionMode: "permanent", historyMaxEntries: 500, historyMaxAgeDays: 0, autoSortPackagesByProgress: true, autoSkipExtracted: false, hideExtractedItems: true, confirmDeleteSelection: true, backupIncludeDownloads: false, backupIncludeMcp: false,
     notifyUrl: "", notifyMention: "", notifyOnPackageCompleted: false, notifyOnPackageFailed: false, notifyOnRunFinished: false,
     accountListShowDetailedDebridLinkKeys: false,
     bandwidthSchedules: [], totalDownloadedAllTime: 0, totalCompletedFilesAllTime: 0, totalRuntimeAllTimeMs: 0,
@@ -1159,13 +1160,13 @@ function formatCheckedAgo(checkedAt: number): string {
 }
 
 function rotationEventText(ev: { event: string; cooldownSec?: number; next?: string; reason?: string }): string {
-  const untilRestart = /bis Neustart gesperrt/i.test(ev.reason || "");
+  const untilRestart = /bis zum Tagesreset gesperrt/i.test(ev.reason || "");
   switch (ev.event) {
     case "OK": return "erfolgreich";
     case "FAILED": {
       if (untilRestart) {
         const nx = ev.next && ev.next !== "ENDE" ? ` → ${ev.next}` : "";
-        return `Tageslimit erreicht, bis Neustart gesperrt${nx}`;
+        return `Tageslimit erreicht, bis zum Tagesreset gesperrt${nx}`;
       }
       const cd = ev.cooldownSec ? `, Cooldown ${ev.cooldownSec}s` : "";
       const nx = ev.next && ev.next !== "ENDE" ? ` → ${ev.next}` : "";
@@ -1176,7 +1177,7 @@ function rotationEventText(ev: { event: string; cooldownSec?: number; next?: str
       const cd = ev.cooldownSec ? `, Cooldown ${ev.cooldownSec}s` : "";
       return `Timeout/Abbruch${cd} → nächster Account beim Retry`;
     }
-    case "SKIP_COOLDOWN": return untilRestart ? "übersprungen (bis Neustart gesperrt)" : "übersprungen (Cooldown aktiv)";
+    case "SKIP_COOLDOWN": return untilRestart ? "übersprungen (bis zum Tagesreset gesperrt)" : "übersprungen (Cooldown aktiv)";
     case "SKIP_DISABLED": return "übersprungen (deaktiviert)";
     case "SKIP_DAILY_LIMIT": return "übersprungen (Tageslimit erreicht)";
     case "SKIP_HOST_COOLDOWN": return "übersprungen (Host-Cooldown)";
@@ -1761,6 +1762,14 @@ export function App(): ReactElement {
   const [startConflictPrompt, setStartConflictPrompt] = useState<StartConflictPromptState | null>(null);
   const startConflictResolverRef = useRef<((result: { policy: Extract<DuplicatePolicy, "skip" | "overwrite">; applyToAll: boolean } | null) => void) | null>(null);
   const [confirmPrompt, setConfirmPrompt] = useState<ConfirmPromptState | null>(null);
+  const [remoteDiag, setRemoteDiag] = useState<RemoteDiagnosticsInfo | null>(null);
+  const [remoteDiagOpen, setRemoteDiagOpen] = useState(false);
+  const [remoteDiagBusy, setRemoteDiagBusy] = useState(false);
+  const [rdHostMode, setRdHostMode] = useState<"local" | "network">("local");
+  const [rdPublicHost, setRdPublicHost] = useState("");
+  const [rdPort, setRdPort] = useState("9868");
+  const [rdAllowlist, setRdAllowlist] = useState("");
+  const [rdName, setRdName] = useState("");
   const confirmResolverRef = useRef<((confirmed: boolean) => void) | null>(null);
   const confirmQueueRef = useRef<Array<{ prompt: ConfirmPromptState; resolve: (confirmed: boolean) => void }>>([]);
   const importQueueFocusHandlerRef = useRef<(() => void) | null>(null);
@@ -4328,6 +4337,89 @@ export function App(): ReactElement {
     });
   };
 
+  const applyRemoteDiagInfo = (info: RemoteDiagnosticsInfo): void => {
+    setRemoteDiag(info);
+    setRdHostMode(info.status.localOnly ? "local" : "network");
+    setRdPublicHost(info.publicHost || (info.status.localOnly ? "" : (info.suggestedHosts[0] || "")));
+    setRdPort(String(info.status.port || 9868));
+    setRdAllowlist(info.allowlist.join("\n"));
+    setRdName(info.name || "");
+  };
+
+  const onOpenRemoteDiagnostics = async (): Promise<void> => {
+    closeMenus();
+    try {
+      const info = await window.rd.getRemoteDiagnostics();
+      applyRemoteDiagInfo(info);
+      setRemoteDiagOpen(true);
+    } catch (error) {
+      showToast(`Ferndiagnose-Status fehlgeschlagen: ${String(error)}`, 3000);
+    }
+  };
+
+  const onSubmitRemoteDiagnostics = async (): Promise<void> => {
+    const port = Number(rdPort) || 9868;
+    const allowlist = rdAllowlist.split(/\r?\n/).map((line) => line.trim()).filter((line) => line.length > 0);
+    if (rdHostMode === "network" && allowlist.length === 0) {
+      showToast("Netzwerkmodus braucht mindestens eine IP oder CIDR in der Allowlist", 3600);
+      return;
+    }
+    setRemoteDiagBusy(true);
+    try {
+      const info = await window.rd.enableRemoteDiagnostics({
+        hostMode: rdHostMode,
+        publicHost: rdPublicHost,
+        port,
+        allowlist,
+        name: rdName
+      });
+      applyRemoteDiagInfo(info);
+      showToast(info.status.running ? "Ferndiagnose aktiv" : "Ferndiagnose konfiguriert", 2600);
+    } catch (error) {
+      showToast(`Aktivieren fehlgeschlagen: ${String(error)}`, 3600);
+    } finally {
+      setRemoteDiagBusy(false);
+    }
+  };
+
+  const onDisableRemoteDiagnostics = async (): Promise<void> => {
+    setRemoteDiagBusy(true);
+    try {
+      const info = await window.rd.disableRemoteDiagnostics();
+      applyRemoteDiagInfo(info);
+      showToast("Ferndiagnose deaktiviert", 2400);
+    } catch (error) {
+      showToast(`Deaktivieren fehlgeschlagen: ${String(error)}`, 3000);
+    } finally {
+      setRemoteDiagBusy(false);
+    }
+  };
+
+  const onRotateRemoteDiagnosticsToken = async (): Promise<void> => {
+    setRemoteDiagBusy(true);
+    try {
+      const info = await window.rd.rotateRemoteDiagnosticsToken();
+      applyRemoteDiagInfo(info);
+      showToast("Neues Token - alter Verbindungscode ist ungueltig", 3000);
+    } catch (error) {
+      showToast(`Token-Rotation fehlgeschlagen: ${String(error)}`, 3000);
+    } finally {
+      setRemoteDiagBusy(false);
+    }
+  };
+
+  const onCopyRemoteDiagnosticsCode = async (): Promise<void> => {
+    if (!remoteDiag?.code) {
+      return;
+    }
+    try {
+      await navigator.clipboard.writeText(remoteDiag.code);
+      showToast("Verbindungscode kopiert", 2200);
+    } catch {
+      showToast("Kopieren fehlgeschlagen", 2200);
+    }
+  };
+
   const onMenuRestart = (): void => {
     closeMenus();
     void window.rd.restart();
@@ -4718,6 +4810,7 @@ export function App(): ReactElement {
                 <button className="menu-submenu-trigger">Remote-Support</button>
                 {openSubmenu === "hilfe-remote" && (
                   <div className="menu-submenu-dropdown">
+                    <button className="menu-dropdown-item" onClick={() => { void onOpenRemoteDiagnostics(); }}><span>Ferndiagnose (MCP) …</span></button>
                     <button className="menu-dropdown-item" onClick={() => { void onExportSupportBundle(); }}><span>Support-Bundle exportieren</span></button>
                     <button className="menu-dropdown-item" onClick={() => { void onToggleSupportTrace(); }}><span>{supportTraceEnabled ? "Support-Trace deaktivieren" : "Support-Trace aktivieren"}</span></button>
                   </div>
@@ -5349,6 +5442,8 @@ export function App(): ReactElement {
                     <div className="setting-hint">Sicherheitsabfrage vor dem Entfernen ausgewählter Einträge.</div>
                     <label className="toggle-line"><input type="checkbox" checked={settingsDraft.backupIncludeDownloads} onChange={(e) => setBool("backupIncludeDownloads", e.target.checked)} /> Download-Liste mitsichern</label>
                     <div className="setting-hint">Sicherung enthält auch die Download-Liste; Standard: nur Einstellungen.</div>
+                    <label className="toggle-line"><input type="checkbox" checked={settingsDraft.backupIncludeMcp} onChange={(e) => setBool("backupIncludeMcp", e.target.checked)} /> Ferndiagnose-Einstellungen mitsichern</label>
+                    <div className="setting-hint">Allowlist, Port und Freigabemodus (lokal/Netzwerk) reisen mit. Verbindungs-Token und eigene Adresse bleiben pro Server – nach dem Import einmal „Aktivieren" drücken.</div>
                     <label className="toggle-line"><input type="checkbox" checked={settingsDraft.theme === "light"} onChange={(e) => {
                       const next = e.target.checked ? "light" : "dark";
                       settingsDraftRevisionRef.current += 1;
@@ -5934,6 +6029,97 @@ export function App(): ReactElement {
         </div>
       )}
 
+      {remoteDiagOpen && (
+        <div className="modal-backdrop" onClick={() => setRemoteDiagOpen(false)}>
+          <div className="modal-card" onClick={(event) => event.stopPropagation()}>
+            <h3>Ferndiagnose (MCP)</h3>
+            <p>Aktiviert einen abgesicherten Lesezugriff auf Status, Logs und Fehler dieses Servers. Den Verbindungscode dem Assistenten geben - er verbindet sich, sieht alles und behebt Probleme.</p>
+            <div className="rd-status-line">
+              <span className={`rd-dot${remoteDiag?.status.running ? " on" : ""}`} />
+              <span>
+                {remoteDiag?.status.running
+                  ? `Aktiv auf ${remoteDiag.status.host}:${remoteDiag.status.port}${remoteDiag.status.localOnly ? " (nur lokal)" : ` (Allowlist: ${remoteDiag.status.allowlistCount})`}`
+                  : "Inaktiv"}
+              </span>
+            </div>
+
+            <div className="rd-field">
+              <label>Sichtbarkeit</label>
+              <div className="rd-seg">
+                <button className={rdHostMode === "local" ? "active" : ""} onClick={() => setRdHostMode("local")}>Nur lokal</button>
+                <button className={rdHostMode === "network" ? "active" : ""} onClick={() => setRdHostMode("network")}>Im Netzwerk</button>
+              </div>
+              <span className="rd-hint">
+                {rdHostMode === "local"
+                  ? "Bindet nur an 127.0.0.1. Fernzugriff nur ueber einen Tunnel (z.B. Tailscale/SSH) - die sicherste Variante."
+                  : "Bindet an 0.0.0.0. Erreichbar im Netzwerk, erfordert eine Allowlist. Nur in vertrauenswuerdigen Netzen/VPN nutzen."}
+              </span>
+            </div>
+
+            <div className="rd-field">
+              <label>Oeffentliche Adresse (fuer den Verbindungscode)</label>
+              <input
+                value={rdPublicHost}
+                placeholder={rdHostMode === "local" ? "127.0.0.1 oder Tunnel-Adresse" : "Server-IP oder DNS-Name"}
+                onChange={(event) => setRdPublicHost(event.target.value)}
+              />
+              {remoteDiag && remoteDiag.suggestedHosts.length > 0 && (
+                <div className="rd-chips">
+                  {remoteDiag.suggestedHosts.map((host) => (
+                    <button key={host} className="rd-chip" onClick={() => setRdPublicHost(host)}>{host}</button>
+                  ))}
+                </div>
+              )}
+            </div>
+
+            <div className="rd-field rd-field-inline">
+              <div className="rd-field">
+                <label>Port</label>
+                <input value={rdPort} onChange={(event) => setRdPort(event.target.value.replace(/[^0-9]/g, ""))} />
+              </div>
+              <div className="rd-field">
+                <label>Name (optional)</label>
+                <input value={rdName} placeholder="z.B. Server-Berlin" onChange={(event) => setRdName(event.target.value)} />
+              </div>
+            </div>
+
+            {rdHostMode === "network" && (
+              <div className="rd-field">
+                <label>Allowlist - erlaubte IPs/CIDR (eine pro Zeile)</label>
+                <textarea
+                  value={rdAllowlist}
+                  placeholder={"203.0.113.5\n10.0.0.0/24"}
+                  onChange={(event) => setRdAllowlist(event.target.value)}
+                />
+                <span className="rd-hint">Pflicht im Netzwerkmodus. Nur diese Quell-IPs duerfen verbinden (zusaetzlich zum Token). Loopback ist immer erlaubt.</span>
+              </div>
+            )}
+
+            {remoteDiag?.status.running && remoteDiag.code && (
+              <div className="rd-field">
+                <label>Verbindungscode</label>
+                <div className="rd-code">{remoteDiag.code}</div>
+                <div className="rd-chips">
+                  <button className="btn" onClick={() => { void onCopyRemoteDiagnosticsCode(); }}>Kopieren</button>
+                  <button className="btn" onClick={() => { void onRotateRemoteDiagnosticsToken(); }} disabled={remoteDiagBusy}>Token neu (Code ungueltig machen)</button>
+                </div>
+                <span className="rd-hint">Enthaelt das Zugriffstoken - wie ein Passwort behandeln. Token neu = alter Code wird sofort ungueltig.</span>
+              </div>
+            )}
+
+            <div className="modal-actions">
+              <button className="btn" onClick={() => setRemoteDiagOpen(false)}>Schliessen</button>
+              {remoteDiag?.status.running && (
+                <button className="btn danger" onClick={() => { void onDisableRemoteDiagnostics(); }} disabled={remoteDiagBusy}>Deaktivieren</button>
+              )}
+              <button className="btn accent" onClick={() => { void onSubmitRemoteDiagnostics(); }} disabled={remoteDiagBusy}>
+                {remoteDiag?.status.running ? "Aktualisieren" : "Aktivieren"}
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
+
       {deleteConfirm && (() => {
         const itemCount = [...deleteConfirm.ids].filter((id) => snapshot.session.items[id]).length;
         const pkgCount = [...deleteConfirm.ids].filter((id) => snapshot.session.packages[id]).length;

src/renderer/styles.css

@@ -3360,3 +3360,110 @@ td {
 .rotation-event .rotation-time { color: var(--muted, #a59c8e); font-variant-numeric: tabular-nums; }
 .rotation-event .rotation-body strong { font-weight: 600; }
 .rotation-event .rotation-reason { color: var(--muted, #a59c8e); }
+
+.rd-status-line {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 13px;
+  color: var(--text);
+}
+.rd-dot {
+  width: 9px;
+  height: 9px;
+  border-radius: 50%;
+  background: var(--muted);
+  flex: 0 0 auto;
+}
+.rd-dot.on {
+  background: #3fb950;
+}
+.rd-field {
+  display: grid;
+  gap: 5px;
+}
+.rd-field > label {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text);
+}
+.rd-field input,
+.rd-field textarea {
+  width: 100%;
+  box-sizing: border-box;
+  background: var(--bg);
+  color: var(--text);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 8px 10px;
+  font-size: 13px;
+  font-family: inherit;
+}
+.rd-field input:focus,
+.rd-field textarea:focus {
+  outline: none;
+  border-color: var(--accent);
+}
+.rd-field textarea {
+  resize: vertical;
+  min-height: 62px;
+}
+.rd-field-inline {
+  grid-template-columns: 1fr 1fr;
+  gap: 10px;
+}
+.rd-hint {
+  font-size: 12px;
+  color: var(--muted);
+  line-height: 1.45;
+}
+.rd-seg {
+  display: flex;
+  width: fit-content;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  overflow: hidden;
+}
+.rd-seg button {
+  background: transparent;
+  color: var(--muted);
+  border: none;
+  padding: 7px 14px;
+  cursor: pointer;
+  font-size: 13px;
+  font-weight: 600;
+}
+.rd-seg button.active {
+  background: var(--accent);
+  color: #1a1206;
+}
+.rd-chips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+}
+.rd-chip {
+  background: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  padding: 3px 9px;
+  font-size: 12px;
+  cursor: pointer;
+  color: var(--muted);
+}
+.rd-chip:hover {
+  color: var(--text);
+  border-color: var(--accent);
+}
+.rd-code {
+  font-family: ui-monospace, "Cascadia Code", monospace;
+  font-size: 12px;
+  word-break: break-all;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 9px 10px;
+  max-height: 120px;
+  overflow-y: auto;
+  color: var(--text);
+}

src/shared/ipc.ts

@@ -52,6 +52,10 @@ export const IPC_CHANNELS = {
   GET_TRACE_CONFIG: "app:get-trace-config",
   SET_TRACE_ENABLED: "app:set-trace-enabled",
   ROTATE_DEBUG_TOKEN: "app:rotate-debug-token",
+  GET_REMOTE_DIAGNOSTICS: "app:get-remote-diagnostics",
+  ENABLE_REMOTE_DIAGNOSTICS: "app:enable-remote-diagnostics",
+  DISABLE_REMOTE_DIAGNOSTICS: "app:disable-remote-diagnostics",
+  ROTATE_REMOTE_DIAGNOSTICS_TOKEN: "app:rotate-remote-diagnostics-token",
   OPEN_REALDEBRID_LOGIN: "app:open-realdebrid-login",
   OPEN_ALLDEBRID_LOGIN: "app:open-alldebrid-login",
   IMPORT_BESTDEBRID_COOKIES: "app:import-bestdebrid-cookies",

src/shared/preload-api.ts

@@ -7,8 +7,10 @@ import type {
   DebridLinkHostLimitInfo,
   DebridProvider,
   DuplicatePolicy,
+  EnableRemoteDiagnosticsInput,
   HistoryEntry,
   PackagePriority,
+  RemoteDiagnosticsInfo,
   RendererErrorReport,
   SessionStats,
   StartConflictEntry,
@@ -71,6 +73,10 @@ export interface ElectronApi {
   getTraceConfig: () => Promise<SupportTraceConfig>;
   setTraceEnabled: (enabled: boolean, note?: string, durationMinutes?: number) => Promise<SupportTraceConfig>;
   rotateDebugToken: () => Promise<{ path: string }>;
+  getRemoteDiagnostics: () => Promise<RemoteDiagnosticsInfo>;
+  enableRemoteDiagnostics: (input: EnableRemoteDiagnosticsInput) => Promise<RemoteDiagnosticsInfo>;
+  disableRemoteDiagnostics: () => Promise<RemoteDiagnosticsInfo>;
+  rotateRemoteDiagnosticsToken: () => Promise<RemoteDiagnosticsInfo>;
   openRealDebridLogin: () => Promise<void>;
   openAllDebridLogin: () => Promise<void>;
   importBestDebridCookies: () => Promise<number>;

src/shared/types.ts

@@ -134,6 +134,7 @@ export interface AppSettings {
   hideExtractedItems: boolean;
   confirmDeleteSelection: boolean;
   backupIncludeDownloads: boolean;
+  backupIncludeMcp: boolean;
   notifyUrl: string;
   notifyMention: string;
   notifyOnPackageCompleted: boolean;
@@ -537,3 +538,30 @@ export interface RendererErrorReport {
   column?: number;
   componentStack?: string;
 }
+
+export interface RemoteDiagnosticsStatus {
+  running: boolean;
+  host: string;
+  port: number;
+  hasToken: boolean;
+  localOnly: boolean;
+  allowlistCount: number;
+}
+
+export interface RemoteDiagnosticsInfo {
+  status: RemoteDiagnosticsStatus;
+  code: string | null;
+  publicHost: string;
+  name: string;
+  allowlist: string[];
+  suggestedHosts: string[];
+}
+
+export interface EnableRemoteDiagnosticsInput {
+  hostMode: "local" | "network";
+  publicHost: string;
+  port?: number;
+  allowlist: string[];
+  name?: string;
+  rotateToken?: boolean;
+}

tasks/audit-loop.md

@@ -1,8 +1,156 @@
 # Autonomer Audit-Loop — Download/Fehler/Rotation (Goal 2026-06-17, 8h)
 
+## GOAL-ANPASSUNG (Nutzer, nach Runde 8 + Synthese-Start): noch Runde 9 + 10, dann Goal BEENDEN.
+Plan: Synthese-Pass (wrexz7mdf, Capstone R1-8) auswerten → Runde 9 (Provider-spezifische
+Unrestrict-/Rotations-Pfade: Mega-Web-Fallback Session/Single-Flight, AllDebrid Host-Cooldown/
+Rapidgator-Backoff, DebridLink-Key-Rotation, Passwort-Cache-Race) → Runde 10 (Concurrency/Locking +
+Settings/Persistenz-Integritaet: Hybrid-Race, targetPath-Claim/Release-Races, Settings-Migration,
+Backup/Restore, account-check) → Abschlussbericht + Ende. Fixes je rot-bewiesen, buendeln zu v1.7.220 falls HIGH/MED.
+
 Disziplin: erst BELEGEN (Code-Zitat + konkretes Szenario), dann adversarisch verifizieren,
 dann TDD-Fix. Kein Blind-Fix. Tests gruen + tsc=6 nach jeder Runde. Periodisch releasen.
 
+## Runde 9 (Provider-spezifische Unrestrict-/Rotations-Pfade) — Mega-Web-Single-Flight + DebridLink-Key + Concurrency
+Fokus: Mega-Web-Fallback Session/Single-Flight-Queue, DebridLink-Key-Rotation, In-Flight-Verteilung.
+- **CONFIRMED HIGH (GEFIXT) MW-1 Selbst-Cooldown eines GESUNDEN, nur in der Queue wartenden Web-Accounts:**
+  Der Caller-Timeout (`DEFAULT_UNRESTRICT_TIMEOUT_MS`=60s) feuert, waehrend die zweite Umwandlung eines
+  Accounts noch SERIELL in der Mega-Web-Single-Flight-Queue (90s `QUEUE_WAIT_TIMEOUT_MS`) auf den laufenden
+  Vorgaenger wartet — also bevor ueberhaupt echte Arbeit begann. `raceWithAbort` warf bisher unbedingt
+  `aborted:mega-web`; `unrestrictViaWeb` (debrid.ts:1887) flachte JEDEN signal-aborted-Fall zu `aborted:debrid`
+  ab; die Rotation (debrid.ts:2072) wertete das via `/aborted/i && !/timeout/i` → `ranLongEnough`
+  (elapsedMs schliesst die Queue-Wartezeit ein, also >= 8s) → **120s Account-Cooldown auf einen voellig
+  gesunden Account**. Genau die vom Nutzer gemeldete „Tool sperrt sich selbst"-Klasse (Web-Variante).
+  Zweiteiliger Fix:
+  (1) `MegaWebFallback.runExclusive` (mega-web-fallback.ts) trackt `workStarted` und reicht eine
+      `abortErrorFactory` an `raceWithAbort`: abgebrochen-bevor-Arbeit-begann → `Mega-Web Queue-Timeout (…)`
+      (matcht `/queue.?timeout/i`), nur ein echter In-Arbeit-Abbruch bleibt `aborted:mega-web`.
+  (2) `unrestrictViaWeb` (debrid.ts:1887) bewahrt einen `/queue.?timeout/i`-klassifizierten lastError statt
+      ihn zu `aborted:debrid` zu plaetten → Rotation trifft die bestehende Queue-Timeout-Ausnahme
+      (classifyAccountFailure 2243 → cooldownMs 0) statt den Abbruch-Cooldown-Zweig.
+  Rot-bewiesen NICHT-vakuum (zwei Tests, beide per Temp-Revert rot verifiziert):
+  - Teil 1 (mega-web-fallback.test.ts): echtes `MegaWebFallback`, Queue mit langsamem Erst-Job belegt,
+    Zweit-Call WAEHREND in Queue abgebrochen → `rejects.toThrow(/queue.?timeout/i)` (ohne Fix: `aborted:mega-web`).
+  - Teil 2 (debrid.test.ts): durch `DebridService.unrestrictLink` mit `RD_MEGA_ABORT_MIN_RUN_MS=0` (besiegt die
+    Vakuum-Falle: der buggy Pfad WUERDE selbst bei Sofort-Abbruch cooldownen), Signal bricht WAEHREND des
+    Calls ab, megaWeb meldet Queue-Timeout → `getMegaDebridAccountCooldownState` bleibt null (ohne Fix: 120s
+    „Abbruch/Timeout nach 0s"). tsc=6, volle mega-web+debrid-Suite 103 gruen inkl. der bestehenden
+    Abbruch-Cooldown-Tests (echter langsamer Account cooled WEITERHIN — keine Regression).
+  - **Rotations-Verifikation (Advisor-Shippability-Diskriminator):** Nach dem No-Cooldown-Pfad retried der
+    Manager `unrestrictWithAccounts` frisch. Die Account-Wahl sortiert per `megaDebridInFlight`-TIEFE
+    (debrid.ts:1981-1986, least-busy zuerst). Invariante: jeder Belegt-Halter der MegaWebFallback-Queue
+    entspricht einem in-flight `client.unrestrictLink`, das `megaDebridInFlight` inkrementiert hat (2033,
+    Dekrement nur im finally 2152). Also sieht der Retry des queue-getimeouteten Links den saturierenden
+    Account bei Tiefe>=1 und rotiert auf einen freien — MW-1 ist NACHWEISLICH besser als das alte 120s-Lockout
+    (das einen nur-belegten gesunden Account sperrte). Kein Tight-Retry-Loop auf saturierter Queue, solange
+    irgendein Account frei ist; sind ALLE saturiert, queued der least-busy (unvermeidbar — keine freie Kapazitaet,
+    aber das alte Cooldown haette es via Faux-Park SCHLIMMER gemacht).
+- **DOKUMENTIERT, nicht gefixt (LOW) DL-1 DebridLink-Key-Cooldown bei User-Cancel-Abbruch:** classifyKeyFailure
+  (debrid.ts:3118-3126) gibt fuer Text mit „aborted" (via isRetryableErrorText 597 + isTransport 3119)
+  `cooldownMs: 15_000` zurueck — auch bei einem SCHNELLEN User-Cancel (kein Min-Run-Gate wie bei Mega 2072).
+  Symptom: 15s Key-Cooldown nach Nutzer-Abbruch. Advisor (revidiert eigenen frueheren „clean fix"-Call):
+  classifyKeyFailure hat KEIN elapsedMs und DebridLink hat keinen Min-Run-Knopf-Aequivalent zu
+  `getMegaDebridAbortMinRunMs()`. Der treue Fix (Caller-Gate bei 2787 spiegeln) braucht entweder cross-Provider-
+  Wiederverwendung des Mega-Knopfes oder einen neuen DebridLink-Knopf = neue Oberflaeche im Live-Hot-Path fuer
+  einen LOW-Bug (Symptom: 15s nach User-Cancel). Klart die eigene „clean + null-Regression"-Schwelle NICHT →
+  dokumentiert, nicht gefixt.
+- **DOKUMENTIERT, nicht gefixt (MED) DL-CONCURRENCY-PILEUP:** Bei gleichzeitigen Umwandlungen, die ALLE
+  Mega-Accounts saturieren, queued der least-busy-Account weitere Links seriell (per-Account-Single-Flight) →
+  Wartezeiten stapeln sich. MW-1 entfernt die FRUEHERE versehentliche Backpressure (der falsche 120s-Cooldown
+  wirkte als grobe Ratenbegrenzung), routet aber korrekt per In-Flight-Tiefe um belegte Accounts herum statt sie
+  faelschlich zu sperren — strikt besser. Echter Fix (In-Flight-Tiefen-Spread groesser ziehen / globale
+  Web-Parallelitaetsgrenze) = groessere Aenderung, 4.-Bug-Risiko auf Live-Server → deferred. MW-1 reduziert das
+  Pileup-in-Park-Risiko bereits (kein Faux-Lockout merely-busy Accounts).
+
+## Runde 10 (Concurrency/Locking + Settings/Persistenz-Integritaet) — LETZTE RUNDE (Nutzer: „nach der Runde ist Schluss")
+4 Finder (hybrid/targetPath-Races, Slot-Accounting, Settings-Migration/Persistenz, Backup-Restore/account-check)
+→ adversarisch 3 Lenses → Synthese. Workflow wwyqsdrf9: 2 Finder (slot-accounting, settings-persistence) starben
+an Stream-Idle-Timeout (Riesen-Dateien) → 0/7 confirmed war NUR fuer 2 von 4 Dimensionen ehrlich. KEIN stilles
+Coverage-Loch akzeptiert → Re-Run wwyqsdrf9b (wfmu4pw2n) mit engerem Scope (Grep-dann-Region statt Ganzdatei).
+- **Dim hybrid/targetPath + backup/account-check (wwyqsdrf9): 7 Kandidaten, ALLE refutiert (>=2/3), quell-reverifiziert.**
+  Kern-Invarianten halten: synchrones `claimTargetPath` (dl-mgr:6257) = nie zwei Items auf einem Pfad → alle drei
+  Hybrid-„Races" kollabieren zu Sub-Sekunden-Redundanzarbeit, kein Collision/Korruption; jeder Loss-Ausgang von
+  CRC/Extraction-Fail re-queued (`hybridExtractRequeue.add` 11739). Restore ist fail-closed (encrypted-or-reject,
+  Binaerheader „MDD1" wirft in JSON.parse vor normalizeSettings). account-check `valid:false` ist reiner
+  Renderer-Badge (kein src/main liest ihn als Gate; Disable laeuft ueber megaDebridDisabledAccountIds).
+- **CONFIRMED MED (DOKUMENTIERT, nicht gefixt) BYTE-DROP-RETRY-1 (wfmu4pw2n):** Integrity-/too-small-/tiny-Retry
+  doppelzaehlt eine volle Datei in die Byte-Statistik. `dropItemContribution` (6247) loescht den
+  itemContributedBytes-Eintrag OHNE von session.totalDownloadedBytes abzuziehen (eigener Kommentar: „retry path
+  subtracts on its own"), aber die EINZIGE Subtraktion (9991-9997) liest genau diesen geloeschten Eintrag → 0 →
+  Subtraktion tot → Re-Download addiert N nochmal → (k+1)*fileSize nach k Integrity-Fails. enableIntegrityCheck
+  default true → organisch. Verdict isReal (CORRECTNESS+REPRO), aber BLAST-RADIUS = NUR Statistik: kein
+  Slot/Admission/Semaphore liest diese Counter (grep-belegt), Session-Counter self-healen bei jedem Neustart,
+  nur persistiertes totalDownloadedAllTime + avg-Speed bleiben dauerhaft inflationiert = kosmetisch. NICHT clean
+  (dropItemContribution ueber 26 Call-Sites ueberladen; ~10 im Retry-Bereich; ein 3-Site-Patch liefert
+  partielles/inkonsistentes Accounting = arguably schlimmer; Guard-Test dl-mgr.test.ts:6152 sperrt die
+  Completion-Removal-Semantik) → DOKUMENTIERT mit Rezept (dropItemContribution splitten in ForCompletion/ForRetry
+  nach Klassifikation aller Retry-Sites re-download-vs-terminal). Kosmetisch + nicht-clean → klart Live-Schwelle nicht.
+- **CONFIRMED MED (GEFIXT) SET-MIG-01 (wfmu4pw2n):** Pre-v1.6.90-Config-Migration tot → Mega-Debrid wird beim
+  ersten Settings-Panel-Save still aus der Provider-Reihenfolge demotet. readSettingsFile (storage.ts:633) merged
+  `{...defaultSettings(), ...parsed}`; defaultSettings setzt megaDebridApiEnabled/WebEnabled:false (constants.ts:50-51)
+  BEVOR normalizeSettings laeuft → der `=== undefined`-Migrationszweig (355-360) ist tot auf dem Disk-Pfad (Git:
+  tot seit v1.6.90/0003d78). Renderer (App.tsx:447-494) gated Mega-Inklusion am false-Flag → persistDraftSettings
+  schreibt eine Mega-bereinigte providerOrder zurueck. Fix: reine `migrateLegacyMegaEnableFlags(parsed)` in
+  readSettingsFile — seedet apiEnabled=preferApi/webEnabled=!preferApi NUR wenn BEIDE Flags im RAW-parsed fehlen
+  UND Creds da sind (Creds-Erkennung wie normalizeSettings: asText(login)&&asText(password)). Lokalisiert, keine
+  normalizeSettings-Signatur-Aenderung, getypt (kein Cast). EHRLICHER Scope (Advisor): rettet NUR Legacy-Configs,
+  die seit dem Upgrade noch NICHT ueber das Settings-Panel neu gespeichert wurden (ein Post-Upgrade-Save schreibt
+  present-false → Trigger feuert nicht mehr) — schmales historisches Fenster, NICHT „rettet die Live-Mega dieses
+  Nutzers". HARTE Grenze (Advisor): Trigger bleibt absent-both; present-false NICHT anfassen (= bewusst-deaktiviert,
+  ununterscheidbar → das geparkte entscheidungen-offen #2-Migrationsrisiko). Rot-bewiesen NICHT-vakuum (Assertion NUR
+  auf den geladenen Flags — providerOrder demotet backend-seitig nicht = waere vakuum; via Temp-Revert rot bestaetigt:
+  apiEnabled true→false). Boundary-Test (bewusst-deaktiviert bleibt false + ohne Creds keine Migration) bleibt beim
+  Revert gruen = unabhaengig. Volle Suite 890 gruen, tsc=6.
+- **REFUTED (wfmu4pw2n) SET-PERSIST-02:** Residual-Lost-Update nach R2-Generations-Guard — der einzige verlorene
+  Payload ist totalRuntimeAllTimeMs (`<=`-Ratchet, naechste Session re-derived) + contrived Sub-ms-Race der die
+  Prozess-Teardown gewinnen muss → self-healing kosmetisch, nicht erreichbar.
+- **Coherence-Verdikt:** Concurrency-Accounting + Settings-Persistenz sind kohaerent. Byte-Counter sind
+  telemetry-only, voll entkoppelt von Admission/Slot (grep-belegt) → BYTE-DROP kann nicht stranden/freezen/
+  ueber-admiten. Persistenz kohaerent bis auf EINE benannte Inkohaerenz: Backend normalizeConfiguredProvider
+  (storage.ts:144) mapt „megadebrid"→konkret unabhaengig der Flags, Renderer gated auf dem Flag = Wurzel von
+  SET-MIG-01 (jetzt am Loader gefixt).
+- **EHRLICHE Coverage-Luecke (vom Audit selbst aufgedeckt, R10-HYB-3):** Die in project_pending genannte
+  Passwort-Cache-Race liegt NICHT in download-manager.ts (dort kein passwordCache/resolvePassword), sondern in
+  src/main/extractor.ts — ausserhalb des Round-10-Scopes. Bewusst NICHT in dieser letzten Runde auditiert (Nutzer:
+  „nach der Runde ist Schluss"); als das eine identifizierte, un-auditierte Concurrency-Seam fuer eine etwaige
+  kuenftige Runde dokumentiert statt still fallengelassen.
+
+## GOAL-ABSCHLUSS
+Runde 9 + 10 erledigt (Nutzer-Anpassung). Release v1.7.220 buendelt: 85c8d6b (Synthese C1/C2/RANGE1-Haertung) +
+MW-1 (HIGH, Web-Selbstcooldown) + SET-MIG-01 (MED, Legacy-Mega-Demotion). Gitea + GitHub-Mirror MIT .exe (4 Assets).
+Dokumentiert-nicht-gefixt: DL-1, DL-CONCURRENCY-PILEUP, BYTE-DROP-RETRY-1, extractor.ts-Passwort-Cache-Seam.
+Beim Nutzer (nicht autonom): 60s-Failover-Kappung + gespiegelter Mega-API/Web-Schalter (entscheidungen-offen.md).
+
+## Nutzer-Nachforderung (nach Goal-Abschluss): die 3 dokumentierten Funde DOCH umsetzen → v1.7.221
+Nutzer: "dann mach das beides erstmal" (BYTE-DROP-RETRY-1 + DL-1 + DL-CONCURRENCY-PILEUP). Nicht relitigiert OB,
+nur WIE (Advisor-gefuehrt, je rot-bewiesen, je full-suite gruen + tsc=6 single-pass).
+- **BYTE-DROP-RETRY-1 (MED) GEFIXT.** Scope-Disziplin (Advisor): NUR Session-Counter + totalDownloadedAllTime,
+  NICHT recordProviderDownloadedBytes/providerDailyUsageBytes (das gated isProviderDailyLimited = Verhalten,
+  und ist nicht provider-keyed → naive Subtraktion wuerde den falschen Provider-Bucket korrumpieren → bewusst
+  ausgeklammert). Mechanismus (a): an den 3 bestaetigten rm-dann-frisch-Sites (Integrity 8979, too-small 9020,
+  tiny 10486) den `dropItemContribution`-Aufruf ENTFERNT → der itemContributedBytes-Eintrag ueberlebt → die
+  bestehende writeMode-"w"-Reconciliation (9991) subtrahiert ihn korrekt (selbst-korrigierend nach writeMode,
+  Append undercounted nicht). Plus: am selben Punkt (9991) `totalDownloadedAllTime -= previouslyContributed`
+  ergaenzt (spiegelt den Add bei 10311; All-Time wurde NIE subtrahiert → doppelte bei JEDEM frischen Re-Download,
+  nicht nur den dropItemContribution-Pfaden). KEINE 23-Site-Reklassifikation (Advisor: Provider-Usage off-limits
+  → jede Restfehlklassifikation ist bounded Telemetrie). Guard-Test dl-mgr.test.ts:6152 (Completion-Removal behaelt
+  Session-Total) bleibt gruen. Rot-bewiesen NICHT-vakuum, BEIDE Beine einzeln: Integration durch echten
+  Integrity-Fail-Retry (.md5-Manifest, lokaler HTTP-Server serviert wrong-dann-correct), Assert session==1x UND
+  allTime==1x; Bein 1 (All-Time-Zeile raus) → allTime rot (2x) session gruen; Bein 2 (dropItemContribution zurueck)
+  → session rot (2x).
+- **DL-1 (LOW) GEFIXT.** Advisor revidierte den frueheren "braucht neue Oberflaeche"-Call: am Rotations-Catch (2789)
+  ist elapsedMs bereits da → Mega-Gate (2072) gespiegelt. abort-ohne-timeout + elapsedMs < getMegaDebridAbortMinRunMs()
+  → KEIN Key-Cooldown (User-Cancel bestraft den Key nicht); ran-long-enough → DEBRID_LINK_KEY_COOLDOWN_MS (120s)
+  damit der Retry rotiert; throw bailt die Rotation (verhindert auch die zuvor moegliche Transport-Kaskade ueber
+  mehrere Keys bei aborted-Signal). Neuer Test-Getter getDebridLinkKeyCooldownStateForTests. Rot-bewiesen
+  (quick-cancel → null; ohne Fix 15s gesetzt; long-abort → >60s, ohne Fix 15s).
+- **DL-CONCURRENCY-PILEUP (MED): untersucht → BEREITS STRUKTURELL GELOEST, kein Eingriff (Nutzer-Entscheidung
+  "Akzeptieren").** getSerializedValidatingLimit("megadebrid-web") = Anzahl nutzbarer (nicht-gecoolter) Accounts
+  (dl-mgr 8047-8055); shouldDelayStartForItem erzwingt es in der Kandidatenwahl (8526) → Ueberschuss-Konvertierungen
+  warten als "queued" im Scheduler, NICHT in den per-Account-Single-Flight-Queues; Depth-Spread (debrid 1981-1986)
+  verteilt die erlaubten 1-pro-Account. MW-1 haelt usableAccounts (= das Limit) korrekt hoch. Ein weiterer
+  Scheduler-Eingriff = redundant ODER schaedlich (Ueber-Admission = echter Pileup) → Advisor-4.-Bug-Risiko. Dem
+  Nutzer vorgelegt (AskUserQuestion) → "Akzeptieren, kein Eingriff".
+
 ## Runde 1 (laeuft)
 - Discover+Verify-Workflow ueber 7 Subsysteme (scheduler-slots, unrestrict-retry, mega-rotation,
   classify-cooldown, mega-web-token, provider-chain-timeout, account-availability).
@@ -76,6 +224,224 @@ daily-limit aggregate early-exit.
   braucht workMs-Threading → groesserer Eingriff, nicht LOW-billig.
 - Vor Runde 4-5: SYNTHESE-Pass — ist Retry/Cooldown/Rotation END-TO-END kohaerent selbstheilend?
 
+## Runde 3 (Failover/Reconnect/Cooldown-Lifecycle/Scheduler/IPC-Toggle/Updater) — Workflow wcwztx7e9
+7 confirmed / 1 refuted. provider-failover-Finder crashte (Socket) → diese Dimension via MEINER
+unabhaengigen Code-Verifikation abgedeckt (60s-Timeout kappt Failover, debrid.ts 3845 + dl-mgr 8814).
+
+### Batch 3 → v1.7.217 (GEFIXT, je rot-bewiesener Test)
+- [x] #R3-1 HIGH (3/3) Self-Cooldown bis Neustart — DER vom Nutzer gemeldete „Tool sperrt sich selbst".
+  (a) limitSignal aus MEGA_DEBRID_NO_SERVER_RE-Zweig entfernt (Hoster-Problem != Account-Limit),
+  (b) until-restart-Park laeuft jetzt zum Tagesreset (lokale Mitternacht) ab statt MAX_SAFE_INTEGER →
+  heilt <=24h selbst. Texte „bis Neustart"→„bis zum Tagesreset". Commit 76b3f99.
+- [x] #R3-5 HIGH (3/3) Fehlgeschlagenes Update → Queue-Stillstand bis Neustart. runInstallWithResume()
+  (neue reine Funktion) resumt bei started:false UND throw. Commit dfd1926.
+- [x] #R3-3 MED (3/3) Account-Edit ueberschreibt megaDebridPreferApi. Hardcode entfernt → ...settings
+  reicht Nutzerwahl durch. Commit 1e04b7b.
+
+### Dokumentiert / NICHT autonom gefixt (Advisor-Disziplin)
+- #R3-2 HIGH (2/3, UMSTRITTEN) Mega API/Web-Account-Zeilen teilen EINE login-only Enable-Flag →
+  Toggle spiegelt sich (= Nutzer-Report „API aus → Web an"). KEIN Auto-Fix: Daten-Modell-Fix braucht
+  Settings-Migration (kann deaktivierte Accounts re-aktivieren), UI-Collapse = Layout-Redesign (Nutzer
+  UI-Geschmack-sensibel). → DEM NUTZER vorlegen: gemeinsamer Schalter vs. unabhaengige pro-Modus-Flags.
+- 60s-Failover-Kappung (HIGH, mein Fund, Finder gecrasht) — debrid.ts 3845 wertet JEDEN combined-signal-
+  Abort (cancel ODER 60s-Timeout) als kein-Failover; langsamer Provider1 hungert Provider2 aus, auch ueber
+  Retries. Post-214 (API-first) groesstenteils latent. → eigene Runde: gecrashten Finder ERST neu laufen
+  lassen (unabhaengige Verifikation fehlt), dann per-Provider-Timeout-Design mit Advisor. NICHT in 217.
+- #R3-6 MED (3/3) Update-Mirror-Failover feuert nie (nur Gitea). NICHT fixen: aendert den Update-Fetch-Pfad
+  = der Kanal, ueber den jeder Fix den Nutzer erreicht; faellt heute sicher aus (App behaelt alte Version).
+- #R3-4 LOW (2/3) providerPrimary kann auf disabled Mega normalisieren — self-heilt zur Laufzeit. Belassen
+  (Refuter: Fix riskanter als Bug — schreibt persistierte Absicht um).
+- #R3-7 LOW (3/3) Update-Integritaet hash-only, kein Authenticode — ehrliche Grenze, faellt sicher aus.
+- REFUTIERT (0/3): all-accounts-parked wirft plain error ohne cooldown-retry-Token.
+
+## Runde 4 (Failover-Routing-Slice + Entscheidungs-Doku)
+Follow-on aus R3-Failover-Fund. Advisor-Disziplin: nur die SICHERE Scheibe autonom, der
+Produkt-Tradeoff geht an den Nutzer (tasks/entscheidungen-offen.md).
+
+### Autonom gefixt (TDD, rot-bewiesen)
+- [x] MED Failover-Routing: Manager berechnete bei Provider-Cooldown (>=20 Fehler in Folge,
+  auto-Fallback an) einen Ersatz-Provider (`findFallbackProviderNotInCooldown`), WARF ihn aber
+  weg — `unrestrictLink(item.url, signal)` ohne Hint → debrid.ts baut `order` neu aus
+  providerOrder und fuehrt WIEDER mit dem ausgebremsten Provider1 an (wahrsch. 60s-Timeout
+  verschwendet). Fix: reine `leadProviderChainWith(order, preferred)` (debrid.ts, export) +
+  4. optionaler Param `preferredLeadProvider` an `unrestrictLink`; Manager reicht den Ersatz
+  durch (dl-mgr 8772/8828). REORDER nicht SKIP → ausgebremster Provider bleibt als letzter
+  Notnagel in der Kette, kein Stranding. All-cooled-Fall erreicht `unrestrictLink` gar nicht
+  (else-Zweig queueRetry'd). Tests: integration (control=realdebrid, preferred=debridlink) +
+  3 reine Helper-Tests (null→unchanged, in-order→leads+keeps-all, not-in-order→unchanged).
+  Suite 875 gruen, tsc=6. Commit folgt; HALTEN fuer Roll-up-Release (kein HIGH/dringend).
+
+### An den Nutzer vorgelegt (NICHT autonom) → tasks/entscheidungen-offen.md
+- 60s-Failover-Kappung (HIGH): A) pro-Provider-Timeout (Failover immer, aber bis 3×60s
+  Worst-Case, Drehregler ueber Pro-Provider-Wert) vs B) globales Budget mit Failover-Reserve
+  (langsamer Provider1 frueher abgeschnitten). Produkt-Tradeoff = Nutzerwahl. Post-214 weitgehend latent.
+- Gespiegelter Mega API/Web-Schalter (HIGH, #R3-2): gemeinsamer Schalter vs unabhaengige
+  pro-Modus-Flags (Migration + UI-Redesign noetig, Nutzer UI-sensibel).
+
+### SYNTHESE-Pass (Cross-Layer: Manager-Cooldown-Keys vs Debrid Account/Daily-Park) — Workflow wrfxpjudj
+2 Kandidaten, 1 confirmed (3/3), 1 refuted (0/3). Advisor-Hypothese (Key-Mismatch) WIDERLEGT.
+- **REFUTED (0/3) KSM-1 Key-Mismatch:** normalizeProviderOrder (storage.ts:144/411) speichert IMMER
+  den aufgeloesten 'megadebrid-api'/'-web', NIE den virtuellen 'megadebrid'. Also fallen
+  Cooldown-WRITE (recordProviderFailure), CHECK (getProviderFailureKeyForItem), CLEAR und READ
+  (findFallbackProviderNotInCooldown) auf denselben aufgeloesten Key → KEINE Divergenz. Der
+  986fbab-Routing-Fix ist fuer den Mega-Fall nachweislich sicher (No-Stranding haelt).
+- **CONFIRMED (3/3) LOW MEGA-UNTILRESTART-MISCLASS (GEFIXT):** Der untilRestart-Park-Throw
+  (debrid.ts:2167) trug KEINEN Maschinen-Token → Manager-Catch klassifiziert ihn als generischen
+  Unrestrict-Fehler (isUnrestrictFailure matcht "mega_debrid") → Retry alle ~2min den ganzen Tag
+  + recordProviderFailure (Circuit-Breaker-Verschmutzung), statt einmal bis Tagesreset zu parken.
+  Default-Config (retryLimit=0=∞) self-heilt um Mitternacht, KEIN Stranding. Genau die
+  Round-3-untilRestart-Park-Absicht, die hier unterlaufen wurde. Predates 986fbab.
+  Fix: debrid.ts emittiert jetzt `mega_debrid_reset_park:<msBisReset>:` (megaDebridDailyParkExpiry);
+  neue reine parseMegaDebridResetPark (kein 15min-Clamp, 26h-Cap) + Catch-Branch VOR der
+  Cooldown-Klassifikation queued bis Tagesreset OHNE recordProviderFailure. Rot-bewiesen
+  (Parser-Tests + debrid-Token-Assertion). tsc=6.
+- **End-to-end-Verdikt:** Retry/Cooldown/Rotation/Failover ist unter Default-Config kohaerent
+  self-heilend (jeder Park hat Zeitgrenze + Auto-Clear). Einzige Rest-Inkohaerenz war die
+  Layering-Naht oben (in-memory untilRestart-Park unsichtbar fuer getAvailableMegaDebridAccounts
+  + isProviderDailyLimited) — mit dem konservativen String-Klassifikations-Fix geschlossen.
+  Der breitere Fix (Selektierbarkeit cooldown-aware machen) bewusst NICHT gemacht (groesserer
+  Blast-Radius auf Live-Server).
+
+## Boot-Verifikation (Advisor-Punkt: Suite gruen != App bootet)
+Smoke-Test des gebauten 1.7.218-Binaries (release\win-unpacked, throwaway userData, leere Session):
+laeuft >10s stabil, spawnt die normalen 4 Electron-Prozesse (main+GPU+renderer+utility), schreibt
+userData/runtime → BOOTET. Boot-Pfad (main.ts-Boot, app-controller-Init, Window/IPC-Registrierung)
+von diesem Audit NICHT angefasst; alle editierten Methoden sind Download-Zeit (von der 884er-Suite
+importiert+konstruiert). Risiko Startup-Regression empirisch ausgeschlossen.
+
+## Advisor-Leitlinie (Stand Runde 8)
+- Nach Runde 8 KEINE weitere Discovery-Runde, sondern ein SYNTHESE/Regressions-Pass ueber den
+  KUMULATIVEN Diff (Interaktion der 6 gestagten/releasten Fixes) — Confirmed-Yield faellt (R5:0/R6:1/R7:1),
+  Risiko ist jetzt Fix-Interaktion, nicht unentdeckte Bugs.
+- Advisor NICHT auf Kadenz pollen — nur bei echter Ship/Fix-Entscheidung mit neuer Info.
+- Die 2 HIGH Produkt/UI-Entscheidungen bleiben beim Nutzer (nicht autonom shippen).
+
+## Release-Status: v1.7.219 RELEASED (Gitea 6ae9f5d + GitHub-Mirror df3670a)
+Roll-up Runde 7+8: be15419 MED VP-1 dt.-Tonspur + eacd0c9 HIGH RANGE-1 Silent-Corruption + REWIND-TRUNCATE.
+HIGH rechtfertigt Release. Advisor explizit cleared (vor Implementierung konsultiert, Check A verifiziert).
+Mirror kuratiert ohne CLAUDE.md/tasks/ (Leak-Check sauber). NAECHSTER SCHRITT (Advisor): Synthese/Regressions-
+Pass ueber kumulativen Diff aller Session-Fixes (Interaktion), KEINE weitere Discovery-Runde.
+
+## Release-Status: v1.7.218 RELEASED (Gitea bbb9355 + GitHub-Mirror 94d143b)
+Roll-up Runde 4+5+6: 986fbab MED Provider-Cooldown-Routing + 03c908b No-Stranding-Test +
+f1e35f5 LOW Mega-Tagesreset-Park + d2a1b83 HIGH Shelve-Loop-RetryLimit. HIGH rechtfertigt das
+Release. Gitea (Live-Update-Quelle): .../releases/tag/v1.7.218. GitHub-Mirror (kuratierter
+Single-Commit ohne CLAUDE.md/tasks/, Leak-Check sauber): Sucukdeluxe/multi-debrid-downloader v1.7.218.
+Advisor war die GANZE Session ueberlastet → autonom released auf Basis: 3x rot-bewiesene Tests
+(je per Temp-Revert verifiziert), volle Suite 882 gruen, tsc=6, unabhaengige Code-Verifikation +
+Multi-Agent-adversarisch, Routing-Fix frueher advisor-gesegnet, Praezedenz 215/216/217 autonom.
+Runde-5/6-Charakterisierungen (PP-SEM-1 benign, DISK-1 deferred, deferred-LOW-Cluster #10/#11/#13
+benign) NICHT released — dokumentiert.
+
+## SYNTHESE/Regressions-Pass (Fix-Interaktion ueber kumulativen Diff v1.7.212..HEAD) — Workflow wrexz7mdf
+3 Reviewer (Catch-Cascade / Streaming / Provider-Chain) + adversarisch verifizieren. 3 confirmed (1 MED, 2 LOW),
+2 refuted. Bestaetigt: Rest komponiert sauber; Risiko war (wie Advisor sagte) Fix-Interaktion, nicht neue Bugs.
+- **CONFIRMED MED (GEFIXT) C1 reset_park maskiert kurzen Cooldown:** Bei BEIDEN Mega-Modi aktiv aggregiert die
+  Provider-Kette beide Token (`mega_debrid_reset_park:LONG` von API-Park + `mega_debrid_cooldown:30000` von
+  Web-Cooldown). Manager prueft reset_park VOR cooldown → Item ~24h geparkt obwohl Web in ~30s erholt. Fix:
+  Cooldown-Zweig VOR reset_park (kuerzerer Delay gewinnt). Rot-bewiesen (Single-Pass-processItem-Test: Aggregat
+  beider Token → retryAfter < 60s, fullStatus "Cooldown" nicht "Tagesreset"; ohne Reorder ~24h).
+- **CONFIRMED LOW (GEFIXT) C2 Token-Truncation:** reset_park-Token konnte von compactErrorText (220-Zeichen-Cap)
+  abgeschnitten werden, wenn Mega nicht Lead + vorheriger Provider verbose → Park still uebersprungen. Fix: Mega-
+  Token aus der UNGEKUERZTEN error.message parsen (megaRawError). (Im selben Edit wie C1.)
+- **CONFIRMED LOW (GEHAERTET + Doku korrigiert) RANGE1-TRUNCATEFAIL-FINALIZE:** Mein 219-Commit OVERCLAIMte —
+  bei FEHLGESCHLAGENEM finalem Rewind-truncate finalisiert tryFinalizeItemFromDisk(9238) die Garbage-Datei
+  (size==totalBytes) VOR dem Re-Entry. NET-NEUTRAL vs pre-audit (v1.7.212 hatte denselben Finalize), KEINE
+  Regression. Haertung: bei truncate-Fehler jetzt rmSync(Teil-Datei)+downloadedBytes=0 → Finalize lehnt ab →
+  sauberer Re-Download (best-effort; faellt der rm auch, bleibt es net-neutral). Macht den 219-Claim wahr.
+- **Refuted (1/3 je):** reset_park von shelve-guard/unrestrictRetries-Exhaustion unter finite retryLimit
+  verdraengt — beide nicht bestaetigt (compound/nicht erreichbar).
+- **Capstone-Verdikt:** Die 8-Runden-Fixes komponieren — inner-rewind success-only-reset und final-rewind sind
+  per-attempt mutually exclusive; prealloc-reconcile double-truncated nicht nach erfolgreichem Rewind; Routing
+  + cooldown + park kohaerent NACH C1/C2-Fix. Diese 3 Synthese-Fixes buendeln zu v1.7.220.
+
+## Runde 8 (Byte-Streaming downloadToFile: Range/Resume/Append/Truncation) — Workflow wwjz4srkq
+3 Finder + adversarisch verifizieren. 3 confirmed (1 HIGH + 2 MED, alle Silent-Corruption-Familie), 1 refuted.
+Advisor VOR Implementierung konsultiert (HIGH-Hot-Path) — Design + Check-A-Branch (totalBytes-null) bestaetigt.
+- **CONFIRMED HIGH (GEFIXT, known-total) RANGE-1 Silent-Mid-File-Corruption:** Auf dem LETZTEN inneren Versuch
+  wird ein injizierter Garbage-Tail nicht zurueckgespult (`attempt < maxAttempts`-Guard greift nicht),
+  resumeRewindBytesNextAttempt ist funktions-lokal (ueberlebt downloadToFile-Re-Entry nicht), der Outer-Handler
+  nimmt fuer terminated-class den generic-retry-Zweig (kein File-Delete), und der Fresh-Link-Resume haengt
+  echte Bytes NACH dem Garbage an → exakt-laengen-Datei besteht die Length-only-Completion-Pruefung; bei
+  manifestlosen .mkv/.mp4 nie erkannt. Fix: Rewind-vor-Throw am Exhaustion-Punkt (truncate letzte
+  RESUME_REWIND_BYTES + downloadedBytes ZUERST setzen → binary-Re-Entry-prealloc-reconcile robust auch bei
+  truncate-Fehler), GEGATED auf `totalBytes != null && > 0`. Check A verifiziert: known-total → rewound
+  size < totalBytes=minBytes → tryFinalizeItemFromDisk(9238) REJECTET → Re-Entry ueberschreibt Garbage.
+  EHRLICHER Scope (Advisor): GEFIXT fuer known-total Medien (Debrid liefert fast immer fileSize);
+  **null-total behaelt die separate, vor-bestehende Silent-Corruption** unter dem dokumentierten
+  Size-only-Validation-Blindspot (durch Rewind NICHT fixbar — kein Laengensignal; nur Hard-Reset wuerde
+  helfen, groesserer Eingriff). Rot-bewiesen: Cross-Call-Test (final-attempt Garbage → Exhaustion →
+  queueRetry → 2. downloadToFile → CONTENT-Gleichheit); ohne Fix Length-Assert gruen + Content-Assert rot.
+- **CONFIRMED MED (GEFIXT) REWIND-TRUNCATE-FAIL:** Das `finally` setzte resumeRewindBytesNextAttempt=0
+  UNBEDINGT, auch wenn die Rewind-truncate (9633) warf → transienter win32-EBUSY/AV-Lock-Fehler liess den
+  Garbage-Tail + cleart das Flag (nie retried). Fix: Reset NUR im Success-Branch → fehlgeschlagenes Rewind
+  wird naechsten Versuch erneut probiert. Defensive Haertung (Advisor "ship it"); Happy-Path von Test 1113
+  + RANGE-1-Test abgedeckt.
+- **DOKUMENTIERT, nicht gefixt (MED, schwaechste, Workload-immun) PREALLOC-ZEROS-ACCEPTED:** win32-Prealloc-
+  Nullen am Ende als komplett akzeptiert fuer NICHT-binaere Typen (1MB-Slack) wenn truncate skip/faellt.
+  Dominante Medien/Archive sind immun (threshold=0). Narrow Conjunction (non-binary >20MB, Gap<1MB, Crash/
+  truncate-fail). Fix bekannt (binary-strict footprint im 416-accept + recovery-finalize), aber deferred.
+- **Refuted (1/3) TRUNC-1:** fsync auf resume-append fehlt — als Power-Loss-Edge eingestuft, nicht confirmed.
+- **Cross-cutting (Advisor: NICHT jetzt anfassen):** Size-only-Completion-Validation ist der gemeinsame
+  Blindspot; kein billiger Content-Check fuer manifestlose Medien → validateDownloadedFileCompletion NICHT
+  umbauen (Risiko 4. Bug). Punkt-Fixes sind korrekt; Blindspot bleibt langfristiges Item.
+
+## Runde 7 (Post-Download: Extraction + Video-Processor + Companion/Orchestrierung) — Workflow wcxk08n5i
+3 Finder + adversarisch verifizieren. 2 confirmed, 0 refuted. Schliesst den deferred-Extraction-Cluster ab.
+- **CONFIRMED MED (GEFIXT) VP-1 Falsche Tonspur:** isGermanStream (video-processor.ts:99-108) wertet die
+  Titel-Regex /\b(german|deutsch)\b/ fuer JEDEN nicht-deutsch-getaggten Stream — NICHT auf "Sprach-Tag fehlt"
+  gegated, obwohl der Kommentar (104-106) genau das als Absicht nennt. pickAudioTrack (124, EINZIGER Caller)
+  nimmt den ERSTEN Treffer → eine eng-Spur mit Titel "...German..." vor der echten ger-Spur GEWINNT → Remux
+  behaelt Englisch, verwirft die korrekte dt. Spur, ersetzt das Original atomar in-place (500) und strippt
+  .DL. → irreversibler Datenverlust + falsche Sprache, als Erfolg gemeldet. Single-Trigger (nicht compound).
+  Betrifft genau die vom Nutzer bestaetigte dt.-Tonspur-Funktion [[project_german_audio_feature]]. Fix:
+  `if (lang) return false;` VOR dem Titel-Fallback (deckt sich mit der Kommentar-Absicht). Rot-bewiesen
+  (2 Tests: eng-Titel-"German" vs echte ger → audioRelIndex 1; eng-Titel-"Deutsch entfernt" → skip). tsc=6.
+- **DOKUMENTIERT, nicht gefixt (LOW compound) PP-1/#13 Companion-Overwrite:** renameCompanionFiles/
+  moveCompanionFiles (dl-mgr 3735/3791) ohne Uniqueness-Guard (anders als MKV via buildUniqueFlattenTargetPath);
+  cross-volume copyFile ohne COPYFILE_EXCL (3696) → ueberschreibt einen vorhandenen Orphan-Companion still
+  (nur .srt/.idx/.nfo, nie Archiv/Video). Compound (Orphan + Namenskollision), Sekundaerdateien, Integrations-
+  TDD noetig → dokumentiert. Fix bekannt (Uniqueness-Guard spiegeln).
+- **Deferred-Extraction-Cluster re-klassifiziert (aus Runde 2):** #10 CRC-Kleindatei-Delete BENIGN (failed
+  Archive aus cleanupSources ausgeschlossen, nicht geloescht); #12 7z-Exit-1-als-Erfolg BENIGN (nur Erfolg
+  wenn KEINE Error-Marker — echte CRC/Korruption korrekt als Fehler); #11 resume-empty-output NOT-CONFIRMED
+  (compound, unbewiesene Hybrid-Collect-Ordering-Annahme); #13 = PP-1.
+
+## Runde 6 (Retry/Backoff/Error-Klassifikations-State-Machine + Disk/IO) — Workflow wqurq83ma
+3 Finder + adversarisch verifizieren. 1 confirmed (2/3), 3 refuted. Schliesst den deferred-LOW-Cluster ab.
+- **CONFIRMED HIGH (GEFIXT) SHELVE-LOOP-RETRYLIMIT:** Bei FINITEM retryLimit>=5 sind alle drei Per-Klasse-
+  Caps = retryLimit; die 15-Failure-Shelve-Zweige (dl-mgr 9166 stall + 9352 error) feuern aber auf
+  hartkodiertem `sum>=15` OBERHALB der Per-Klasse-Terminal-Fails und HALBIEREN danach alle Counter →
+  Per-Klasse-Caps werden nie gleichzeitig ueberschritten → Item failt NIE, schleift ewig, item.retries
+  waechst ueber das konfigurierte Limit, Slot gestrandet, providerFailures.delete besiegt wiederholt den
+  Circuit-Breaker → Hoster-Hammering. resetStaleRetryState rettet nicht (<=90s-Re-Admit haelt updatedAt
+  frisch < 10min-Stale). Default retryLimit=0=∞ NICHT betroffen (Shelve ist dort der gewollte Park-Backstop).
+  Fix: in BEIDEN Shelve-Zweigen vor dem queueRetry `if (configuredRetryLimit > 0 && item.retries >=
+  configuredRetryLimit)` → terminal failen statt requeue (∞-Modus unberuehrt). Rot-bewiesen (Single-Pass-
+  Integrationstest: genericErrorRetries=15 vorgeseedet + injizierter Generic-Error → status "failed" statt
+  requeue). tsc=6.
+- **Deferred-LOW-Cluster re-klassifiziert (aus Runden 1-2):** #10 HTTP416-shared-counter BENIGN (maxHttp416Retries
+  eigenes Budget, speist Shelve-Summe NICHT); #11 fresh-retry-preempt BENIGN (One-Shot-Booleans);
+  STALL-CAP-OFF-BY-ONE real aber +1 (Zutat von CONFIRMED-1, kein eigener Strand); #13 queue-wait→elapsedMs
+  BENIGN (queueRetry resettet attempts/updatedAt, Stall-Detektor misst nur aktiven Download). #12 = der
+  gefixte Bug. DISK-1 (ENOSPC/EACCES via Generic-Budget) kein eigener Bug (in finite vom Cap + diesem Fix
+  begrenzt; in ∞ by-design) → optionale Klassifikations-Erweiterung, deferred bis Nutzer Full-Disk-Hammering meldet.
+
+## Runde 5 (unberuehrte Subsysteme: auto-reconnect, Scheduler-Fairness, Crash/Persistenz) — Workflow w7woztsxx
+3 Finder (reconnect / scheduler / persistence) → adversarisch verifizieren (3 Lenses). 1 Kandidat, 0 confirmed.
+**Sauberes „kein bestaetigter Bug"-Ergebnis.** Auto-reconnect-Resume, Slot-Accounting/Fairness und
+Crash-Recovery/targetPath-Lifecycle sind solide (jeder Park/Slot hat Auto-Clear, stop/reset/abort drainen
+Waiter + nullen Counter).
+- **DOKUMENTIERT, nicht gefixt (LOW, benign): PP-SEM-1** Post-Process-Semaphore (acquire/releasePostProcessSlot,
+  ~7269-7304). Mechanismus real: ein geweckter Waiter, dem ein Fast-Path-Queue-Jumper im Microtask-Gap den
+  Slot klaut, laeuft trotzdem (Re-Check nach next.resolve() nicht autoritativ) und released spaeter einen nie
+  inkrementierten Slot → packagePostProcessActive UNTER-zaehlt um 1/Vorkommen. Wirkung: **Ueber-Admission**
+  (mehr als maxParallelExtract parallele Extraktionen) = gebundene CPU/IO-Verschwendung, NIE Strand/Loss/
+  Korruption. Der einzige Strand-Pfad (`<=0`-Guard skippt Waiter-Wake) war NICHT organisch erreichbar (nur
+  durch manuelles Nullen des Counters). Self-heilt bei jedem stop/reset/drain. Fix bekannt (Re-Check
+  autoritativ machen ODER Increment in den Releaser ziehen) + rot-testbar, aber benign → kein Live-Server-
+  Hotfix wert (LOW-Fix-Schwelle: Wirkung ist Verschwendung, keine Korrektheit).
+
 ## Runde 2 (Download-Ausfuehrung: stream/resume/disk/integrity/extract/persist) — Workflow whspc8ddv
 14 confirmed / 7 refuted (>=2/3 adversarisch). Alle HIGH/MED unten unabhaengig am echten Code
 verifiziert (Zeilen zitiert) bevor gefixt. Jeder Fix mit rot-bewiesenem Test, tsc bleibt 6.

tasks/entscheidungen-offen.md

@@ -0,0 +1,164 @@
+# Offene Entscheidungen für dich (Audit-Loop 2026-06-17)
+
+Diese zwei Punkte habe ich BEWUSST nicht autonom „gefixt", weil jede Lösung
+einen Produkt-/Geschmacks-Kompromiss enthält, den du entscheiden solltest, nicht ich.
+Beide sind verifiziert (Code-Zitat + Szenario), nur die Richtung ist deine Wahl.
+
+---
+
+## 1. Failover-Kappung durch globalen 60-Sekunden-Timeout (HIGH)
+
+**Was passiert (belegt):**
+`download-manager.ts` baut EINEN Timeout fürs gesamte Unrestrict:
+```
+const unrestrictTimeoutSignal = AbortSignal.timeout(getUnrestrictTimeoutMs());   // 60s
+const unrestrictedSignal = AbortSignal.any([active.abortController.signal, unrestrictTimeoutSignal]);
+```
+Dieses EINE Signal geht an die komplette Provider-Kette in `debrid.ts`. Die 60s sind
+also ein Budget für ALLE Provider zusammen, nicht pro Provider. Wenn Provider 1
+(z.B. Mega-Web mit Account-Queue) das Budget verbraucht, dann sieht Provider 2 ein
+bereits abgelaufenes Signal → `debrid.ts` wertet den Abbruch als „kein Failover" und
+wirft, ohne Provider 2 echt zu versuchen.
+
+**Aktuell weitgehend latent:** Seit v1.7.214 wird die API zuerst probiert (schneller Pfad),
+Mega-Web ist nur noch Fallback. Das Szenario „langsamer Provider 1 hungert Provider 2 aus"
+trifft in der Produktion derzeit selten. Deshalb dokumentiert statt dringend gefixt.
+
+**Deine Entscheidung — zwei Richtungen (gleiche Spannung, andere Seite):**
+
+- **A) Pro-Provider-Timeout:** Jeder Provider bekommt sein eigenes frisches Budget.
+  Failover bekommt IMMER einen echten Versuch.
+  *Kosten:* Worst-Case-Wartezeit pro Item steigt. Das Budget ist dabei ein DREHregler, kein
+  fixer Wert: 60s/Provider = bis 180s Worst-Case (3 Provider), 30s/Provider = bis 90s usw.
+  Du akzeptierst langsameres Worst-Case-pro-Item für vollständigeres Failover — und stellst
+  über den Pro-Provider-Wert ein, wie viel langsamer.
+
+- **B) Globales Budget behalten, aber Slice für Failover reservieren:** Provider 1 wird auf
+  z.B. 35s gedeckelt, damit garantiert Zeit für Provider 2 bleibt.
+  *Kosten:* Ein legitim langsamer Provider 1 (Mega-Web-Account-Queue bis ~90s) wird früher
+  abgeschnitten → mehr Failover, auch wenn Provider 1 noch erfolgreich gewesen wäre.
+
+Kernfrage, die nur du beantworten kannst: **Wie lange darf ein Item bei einem langsamen
+aber funktionierenden Provider hängen, bevor wir ihn zugunsten des nächsten aufgeben?**
+
+---
+
+## 2. Gespiegelter Mega API/Web-Schalter (HIGH, in Runde 3 als 2/3 bestätigt)
+
+**Was passiert (belegt):** Die Mega-Debrid API- und Web-Account-Zeilen teilen sich EINE
+login-only Enable-Flag (`hasMegaDebridCredentials` gilt für beide; die Pro-Modus-Auswahl
+läuft über `isMegaDebridModeEnabled(settings, "api"|"web")`). Dein Report: „API ausschalten
+schaltet Web an" — weil der Schalter sich spiegelt.
+
+**Warum ich es NICHT autonom geändert habe:**
+- Daten-Modell-Fix (echte unabhängige Flags) braucht eine Settings-Migration, die
+  deaktivierte Accounts versehentlich re-aktivieren könnte.
+- Die saubere UI-Variante (zwei echte unabhängige Schalter) ist ein Layout-Redesign — und
+  du bist UI-Geschmack-sensibel; das will ich nicht ungefragt umbauen.
+
+**Deine Entscheidung:** Ein gemeinsamer Schalter (API+Web zusammen an/aus, klar beschriftet)
+ODER zwei unabhängige Pro-Modus-Schalter (mehr Kontrolle, aber UI + Migration nötig)?
+
+---
+
+## Erledigt in dieser Runde (zur Info, kein Handlungsbedarf)
+
+- **Download-Statistik zählt eine Datei nach einem Integritäts-/Zu-klein-Neuversuch nicht mehr doppelt:**
+  Schlug eine Datei die CRC-/Hash-Prüfung fehl (oder kam zu klein an) und wurde komplett neu geladen, wurde die
+  Dateigröße bisher pro Versuch erneut in die Statistik addiert — die Anzeige „insgesamt heruntergeladen" (Session
+  und Gesamt-Zähler) sowie die daraus berechnete Durchschnittsgeschwindigkeit waren dadurch bei flatterhaften Hostern
+  um die jeweilige Dateigröße aufgebläht (bei großen Archiven mit wiederholten CRC-Fehlern um mehrere GB). Jetzt zählt
+  jede gelieferte Datei genau einmal. Reine Anzeige-/Statistik-Korrektur — Slot-Vergabe, Tageslimits und der
+  Download-Ablauf waren nie betroffen (die Tageslimit-Zähler werden bewusst nicht angefasst, da sie die Provider-Auswahl
+  steuern und der echte Datenverkehr über die Leitung ging). Rot-bewiesener Test, beide Zähler einzeln geprüft.
+
+- **Debrid-Link: ein abgebrochener Vorgang sperrt den Key nicht mehr unnötig:**
+  Wenn du einen Vorgang abgebrochen hast (oder der Gesamttimeout zuschlug), bevor echte Arbeit lief, bekam der
+  Debrid-Link-Key bisher trotzdem eine 15-Sekunden-Sperre — bei mehreren Abbrüchen in Folge konnte das sogar über
+  mehrere Keys kaskadieren und eine längere providerweite Sperre auslösen. Jetzt wird ein schneller Abbruch (vor der
+  Mindest-Laufzeit) nicht mehr als Key-Fehler gewertet: keine Sperre. Lief der Vorgang dagegen lange genug und brach
+  dann ab (echter langsamer/hängender Key), wird er weiterhin gesperrt, damit der nächste Versuch sauber auf den
+  nächsten Key rotiert. Spiegelt exakt das Verhalten, das es bei Mega-Debrid schon gibt. Rot-bewiesener Test.
+
+- **Mega-Konvertierungs-Stau (geprüft, kein Eingriff nötig):** Die Zahl gleichzeitiger Mega-Umwandlungen ist bereits
+  auf die Anzahl nutzbarer Accounts gedeckelt — Überschuss wartet sauber im Scheduler statt sich in den Account-
+  Warteschlangen zu stapeln, und der oben beschriebene Mega-Web-Fix hält dieses Limit jetzt korrekt hoch. Ein
+  zusätzlicher Eingriff wäre überflüssig oder würde durch Über-Vergabe erst echten Stau erzeugen. Auf deine
+  Entscheidung hin daher bewusst NICHT verändert.
+
+- **Alte Konfiguration: Mega-Debrid fällt nach einem Upgrade nicht mehr still aus der Provider-Reihenfolge:**
+  Eine Konfigurationsdatei, die noch von einer sehr alten Version (vor v1.6.90) stammt, kannte die getrennten
+  Mega-Debrid „API aktiv"/„Web aktiv"-Schalter noch nicht. Beim Laden wurden diese fehlenden Schalter still auf
+  „aus" gesetzt, obwohl Mega-Zugangsdaten vorhanden waren — und sobald man danach das erste Mal die Einstellungen
+  speicherte, wurde Mega-Debrid dadurch lautlos aus der Provider-Reihenfolge entfernt. Jetzt wird beim Laden einer
+  solchen alten Datei erkannt, dass die Schalter komplett fehlen, und Mega-Debrid passend zu deiner Bevorzugung
+  (API oder Web) aktiviert — genau die Migration, die ursprünglich gedacht war, aber durch einen Default-Vorrang
+  nie ausgelöst hatte. Ehrlicher Umfang: Das betrifft nur alte Dateien, die seit dem Upgrade noch NICHT über die
+  Einstellungen neu gespeichert wurden — wer seit dem Update schon einmal in den Einstellungen gespeichert hat, hat
+  die Schalter bereits als „aus" stehen und greift dort weiterhin manuell ein (das ist Absicht: ein bewusst auf
+  „aus" gestellter Schalter wird NICHT wieder angeschaltet). Rot-bewiesener Test; voller Testlauf grün.
+
+- **Mega-Web: gesunder Account sperrt sich nicht mehr selbst, nur weil er gerade belegt war (deine „Tool sperrt sich selbst"-Klasse, Web-Variante):**
+  Wenn mehrere Links gleichzeitig über DENSELBEN Mega-Account umgewandelt wurden, laufen sie absichtlich nacheinander
+  (eine Warteschlange pro Account, damit nicht doppelt eingeloggt/gehämmert wird). Wartete ein Link in dieser Schlange
+  noch auf seinen Vorgänger und lief dabei der 60-Sekunden-Gesamttimeout ab, wurde der Abbruch fälschlich wie ein echter
+  Account-Fehler gewertet → der völlig gesunde Account bekam 120 Sekunden Sperre. Jetzt wird ein Abbruch, der NOCH IN DER
+  Warteschlange passiert (bevor echte Arbeit begann), als reiner Warteschlangen-Timeout erkannt: KEINE Account-Sperre,
+  der Link wird einfach erneut versucht und rotiert dann von selbst auf einen freien Account. Ein echter Abbruch MITTEN
+  in der Arbeit sperrt den Account weiterhin (damit langsame Accounts korrekt übersprungen werden) — das blieb unverändert.
+  Zwei rot-bewiesene Tests (jeder ohne Fix nachweislich rot; der zweite läuft komplett durch die echte Account-Rotation
+  und prüft, dass keine Sperre gesetzt wird). Die Rotation auf einen freien Account ist über die Auslastungs-Verteilung
+  (am-wenigsten-belegter-Account-zuerst) abgesichert — strikt besser als die alte 120s-Pauschalsperre.
+
+- **Stille Datei-Beschädigung beim Resume nach Verbindungsabbruch behoben (für Dateien mit bekannter Größe):**
+  Wenn ein Debrid-Server beim Abbruch einen kleinen Fehler-Müll-Block mitten in den Datenstrom schreibt und
+  das genau im LETZTEN Wiederhol-Versuch passierte, blieb dieser Müll in der Datei und der anschließende
+  Neuversuch (mit frischem Link) hängte die echten Bytes DAHINTER an — die Datei hatte am Ende exakt die
+  richtige Größe und galt deshalb als fertig, obwohl mittendrin Müll steckte. Bei .mkv/.mp4 ohne Prüfsumme
+  fiel das nie auf. Jetzt wird der verdächtige Datei-Schwanz vor der Linkerneuerung zurückgespult, sodass der
+  Neuversuch ihn sauber überschreibt. Rot-bewiesener Test (Inhalt byte-genau geprüft, nicht nur die Länge).
+  Ehrlich eingeordnet: Das ist behoben für Dateien, bei denen der Anbieter die Größe meldet (fast immer der
+  Fall). Für die seltenen Fälle ganz ohne Größenangabe bleibt eine separate, schon vorher bestehende Lücke
+  (ohne Längensignal nicht über dieses Rückspulen lösbar) — dokumentiert als langfristiges Thema.
+- Zusätzlich gehärtet: Ein fehlgeschlagenes Zurückspulen (z.B. Datei kurz von Virenscanner gesperrt) wird
+  jetzt im nächsten Versuch erneut probiert statt still übergangen.
+
+
+- **Deutsche Tonspur: falsche Spur-Auswahl behoben (Datenverlust-Schutz):** Die Erkennung der
+  deutschen Tonspur hat den Titel-Text einer Spur („...German...") auch dann ausgewertet, wenn die
+  Spur bereits ein anderssprachiges Tag hatte (z.B. eine englische Spur mit „German" im Titel, wie
+  „German Commentary"). Lag so eine Spur VOR der korrekt mit „ger" getaggten Spur, wurde die falsche
+  (englische) behalten und die echte deutsche Spur beim Remux unwiderruflich verworfen — das Ergebnis
+  wurde als Erfolg gemeldet. Jetzt wird der Titel nur noch dann herangezogen, wenn gar kein Sprach-Tag
+  vorhanden ist (so war es ohnehin gemeint). Korrekt getaggte deutsche Spuren gewinnen jetzt immer.
+  Rot-bewiesener Test. (Noch nicht released — wird mit der nächsten Runde gebündelt.)
+
+
+- **Endlos-Wiederholung bei festem Wiederholungslimit behoben:** Wenn du ein FESTES Retry-Limit
+  (z.B. 5) eingestellt hattest UND ein Link sprunghaft verschiedene Fehlerarten produzierte
+  (mal Umwandlungs-Timeout, mal Abbruch mitten im Download, mal allgemeiner Fehler), konnte ein
+  Eintrag in einer Endlosschleife hängen: eine interne „Viele-Fehler"-Pause halbierte die Zähler,
+  sodass das eingestellte Limit nie erreicht wurde — der Eintrag scheiterte nie, blockierte dauerhaft
+  einen Download-Slot und hämmerte den Anbieter (weil dabei auch die Anbieter-Sperre zurückgesetzt
+  wurde). Jetzt wird das von dir eingestellte Limit hart eingehalten: nach N Versuchen scheitert der
+  Eintrag sauber. Standard-Einstellung („unendlich", der Auslieferungs-Default) war nie betroffen.
+  Rot-bewiesener Test.
+
+
+- **Mega „bis Tagesreset gesperrt" parkt jetzt wirklich (statt alle 2 min neu zu versuchen):**
+  Wenn ALLE Mega-Accounts wegen wiederholt leerer Antworten bis zum Tagesreset geparkt waren,
+  hat das Tool den Fehler bisher als normalen Umwandlungsfehler behandelt und den ganzen Tag
+  alle ~2 Minuten neu probiert (und dabei den Provider-Circuit-Breaker mit Fehlern vollgemüllt).
+  Jetzt erkennt es den Park und legt das Paket EINMAL bis zum Tagesreset schlafen — genau das,
+  was der „bis Tagesreset"-Park eigentlich erreichen sollte. Bei Standard-Einstellungen heilte
+  sich das vorher schon um Mitternacht selbst (kein Datenverlust), war aber unnötige Log-Flut
+  und Churn. Rot-bewiesener Test.
+
+
+- **MED Failover-Routing:** Wenn ein Provider in den Manager-Cooldown läuft (≥20 Fehler in
+  Folge) und auto-Fallback an ist, hat der Manager bisher zwar einen Ersatz-Provider berechnet,
+  ihn aber WEGGEWORFEN — die Kette führte trotzdem wieder mit dem ausgebremsten Provider an.
+  Jetzt wird der Ersatz-Provider als „Lead" durchgereicht und die Kette führt mit ihm an, OHNE
+  einen Provider zu verlieren (der ausgebremste bleibt als letzter Notnagel in der Kette).
+  Greift nur, wenn der Provider bereits nachweislich degradiert ist → strikt-besser-wenn-aktiv,
+  kein Timeout/Cancel-Vertrag berührt. Rot-bewiesener Test. (Hält für Roll-up-Release bereit.)

tasks/todo.md

@@ -1,37 +1,42 @@
-# Massives Conversion-Logging (v1.7.213) + Failover-Fix
+# MCP-Ferndiagnose (Goal, ultracode) — v1.7.223
 
-## Problem (live belegt, 2026-06-17)
-- Links haengen mit "Unrestrict Timeout nach 60s", R53/R64, halten Download-Slot → Stop-and-Go.
-- Web-first: 1 globaler 60s-Timeout um die GANZE Provider-Kette → Web frisst das Budget,
-  API-Failover wird NIE versucht (debrid.ts 3801 `signal.aborted` → throw). Retry startet wieder bei Web.
-- API-first laeuft "um einiges fluessiger" (User bestaetigt: API resolved UND downloaded auf dem Server).
-- ABER: API-Token-Fehler ("Token error, please log-in") + "Login oder Unrestrict fehlgeschlagen"
-  → beide Accounts kriegen Cooldown → Doom-Loop. connectApi single-flightet Logins schon (pendingConnects),
-  also ist die Token-Ursache NICHT trivial → braucht Token-Lifecycle-Logging.
+## Ziel (Nutzer)
+"Baue massive Diagnose-Funktionen ein (MCP), so dass ich MCP auf nem Windows-Server aktivieren kann und du
+auf den Server zugreifst und WIRKLICH ALLES siehst (State, Fehler, Logs, Probleme). 5-6 Server, ueber
+Verbindungscode. Du verbindest dich → liest alles → behebst Probleme direkt."
 
-## Kern-Blindstelle
-Bestehende Logs (account-rotation.log) zeigen `elapsedMs` aber NICHT:
-- queue-wait vs aktive Arbeit (war der 60s-Timeout Warten in der Queue oder echtes Arbeiten?)
-- Token-Lifecycle (cacheHit/freshLogin/invalidation) → woher "Token error"?
-- Provider-Ketten-Entscheidung pro Item (welche Provider, welches Budget, warum Stopp)
-- Was war in-flight als der Caller-60s-Timeout feuerte (Provider/Account/Phase) + Slot-Belegung
+## Architektur (Advisor-bestaetigt v1)
+- Standalone **stdio MCP-Bridge** auf MEINER (Claude-Code-)Maschine, proxyt zur bestehenden HTTP `debug-server.ts`
+  jedes Servers via **Verbindungscode**. Eine Bridge bedient alle 5-6 Server.
+- KEIN eingebettetes MCP-over-HTTP (verworfen: hand-rolled Protokoll auf Internet-Oberflaeche = mehr Risiko).
+- Bridge-Code identisch fuer Direkt-IP vs spaeterer Tunnel (proxyt host:port).
+- Verbindungscode: `rddiag:v1:<base64url(JSON {v,h:host,p:port,t:token,n?:name,fp?:certFp})>`. Nutzer liefert
+  oeffentlichen Host (nicht auto-detecten).
 
-## Plan (Release 213 = NUR Logging, bewusst KEINE Verhaltensaenderung — damit das naechste Bundle das ECHTE aktuelle Verhalten zeigt)
-- [x] `src/main/conversion-trace.ts`: AsyncLocalStorage-Trace + dedizierte `conversion.log`. EIN strukturierter Block pro Unrestrict-Versuch.
-- [x] Wiring: init in app-controller, shutdown, support-bundle.
-- [x] Instrumentiert (nur tracePhase-Calls, additiv, no-op ohne aktiven Trace):
-      - download-manager unrestrict-Boundary: runWithConversionTrace + Caller-Timeout-Attribution + describeSlotOccupancy.
-      - debrid.ts Provider-Kette: chain-try/chain-ok/chain-failed/chain-aborted (zeigt ob Failover feuert).
-      - debrid.ts Mega-Rotation: mega-account workMs + outcome (ok/failed/fatal/aborted) + cooldown.
-      - MegaDebridClient connectApi/doConnectApi/unrestrictViaApi: token cached/pending-join/fresh-login + connectMs + getLink response_code/text (DAS klaert "Token error").
-      - mega-web-fallback runExclusive: web-queue queueWaitMs + workMs (DAS klaert ob 60s = Warten oder Arbeit).
-- [x] Test: conversion-trace.test.ts (Formatter + ALS-Kontext). tsc unveraendert 6.
-- [ ] Build + Suite gruen. Release 213 (Gitea + Mirror).
+## Sicherheitsmodell (Advisor, first-class)
+Plain HTTP + Bearer ueber Internet = sniffbares Token mit Lesezugriff auf sensible Logs. Mitigations:
+- App-seitige IP-Allowlist (extractDebugClientIp existiert schon).
+- `/trace/config` MUTIERT → "read-only"-Claim auditieren: Writes von Remote-Oberflaeche gaten oder umlabeln.
+- Opt-in + sofort widerrufbar (Token-Rotation killt Zugang).
+- debug_token.txt in userData bestaetigen (ueberlebt Auto-Update).
+- Optional self-signed Cert + Fingerprint im Code gepinnt (NICHT v1-blockierend).
 
-## DEFERRED auf 214 (erst NACH Logs, kein Blind-Fix mehr)
-- 60s global → per-Provider-Budget (Failover feuert) — proven, aber erst messen: tritt der 60s ueberhaupt bei API-first auf, und ist es Queue oder Arbeit?
-- API Token-Error Doom-Loop ("Token error, please log-in") — Mechanismus per conversion.log verifizieren, DANN fixen (evtl. per-Account-Serialisierung fuer API wie bei Web).
-- Config-Realitaet an User: 2. Account (xe) lief abgelaufen/deaktiviert → 212-Parallelitaet griff nicht; API-first ist der schnelle Pfad.
+## Phasen
+- [x] **P0 Vertical Slice (Diskriminator) — ERLEDIGT, harness ALL PASS:** Bridge → debug-server via stdio JSON-RPC, echte Daten zurueck.
+  - [x] MCP SDK API holen (context7) → @modelcontextprotocol/sdk 1.29.0, registerTool(name,{inputSchema:zodShape},cb)
+  - [x] Bridge in `tools/rd-diagnostics-mcp/` (eigenes package.json, NICHT in App-Bundle): code.mjs/http.mjs/bridge.mjs/gen-code.mjs
+  - [x] 14 Tools: rd_servers/rd_ping/rd_diagnostics/rd_status/rd_items/rd_packages/rd_errors/rd_logs/rd_history/rd_accounts/rd_host/rd_self_check/rd_get + Multi-Server (code|server|RDDIAG_CODE|RDDIAG_SERVERS)
+  - [x] Verbindungscode-Codec rddiag:v1:base64url({v,h,p,t,n?,fp?,s?})
+  - [x] Test-Harness (test/harness.mjs): fake debug-server (auth+routes+query-echo) + Bridge als stdio-Child → 19 Checks gruen (handshake, tools/list, ping, diagnostics+query-passthrough, logs-mapping, errors, escape-hatch, 401, missing-code, unreachable+hint)
+- [x] **P1 Security-Hardening — ERLEDIGT:** IP-Allowlist (exakt+CIDR), erzwungen VOR Auth am ECHTEN Socket-Peer (req.socket.remoteAddress), NICHT X-Forwarded-For (Advisor: XFF faelschbar → Bypass; gefixt+Threat-Test). Fail-closed. /trace/config belassen (zeitbegrenzt). userData/runtime verifiziert. Log-Audit: keine Secrets in /logs/*.
+- [x] **P2 One-Click-Enable + Code — ERLEDIGT:** restartDebugServer ('close'+closeAllConnections, EADDRINUSE). IPC get/enable/disable/rotate + Controller + Typen. Flache Modal-UI (Hilfe→Remote-Support→"Ferndiagnose (MCP)"): Status, lokal/netzwerk, Public-Host+Chips, Allowlist, Code+Copy+Token-Rotation+Deaktivieren.
+- [x] **P3 — durch bestehende Endpunkte abgedeckt:** /accounts (Cooldown/Rotation), /errors, /status, /diagnostics via Bridge. Kein neuer Endpunkt noetig.
+- [x] **P4 Verify — ERLEDIGT:** Suite 906 gruen, tsc=6, Harness gruen, Advisor (fing XFF-Bypass). Release v1.7.223 Gitea (6b52678, 4 Assets) + Mirror (24485be, 4 Assets, Claude-frei). Bridge `claude mcp add` (user, ✔ Connected).
+- [ ] **P5 Reachability (NUTZER):** Ferndiagnose auf 1 Server an → Code an mich → ich verbinde. Entscheid: Tunnel (sicherste, "Nur lokal") vs Direkt-Bind 0.0.0.0+Allowlist (nur vertrauenswuerdiges Netz/VPN; Token reist plain HTTP).
 
 ## Review
-Logging-Release: pure Diagnose, null Verhaltensrisiko. Naechster Schritt: User reproduziert, schickt Bundle, conversion.log zeigt Queue-vs-Arbeit + Token-Lifecycle eindeutig → praeziser Fix in 214.
+Vertikaler Slice zuerst (Bridge gegen Fake-Debug-Server, JSON-RPC stdio), dann App-Seite load-bearing-first
+(Backend+Tests vor UI). Advisor fing einen releaseblockierenden Bug: Allowlist nutzte extractDebugClientIp
+(X-Forwarded-For zuerst = angreiferkontrolliert) → Bypass per `X-Forwarded-For: 127.0.0.1`; Tests maskierten es
+(injizierten die IP per genau dem Header). Fix: Enforcement am Socket-Peer, XFF nur fuers Log; Threat-Test
+(socket 8.8.8.8 + XFF 127.0.0.1 → denied). Empfohlener Transport: Loopback+Tunnel; Direkt-Bind nur mit Allowlist.

tests/account-dialog-prefer-api.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import { applyAccountDialogToSettings, AccountDialogState } from "../src/renderer/App";
+import { defaultSettings } from "../src/main/constants";
+
+function megaDialog(kind: "megadebrid-api" | "megadebrid-web"): AccountDialogState {
+  return {
+    mode: "edit",
+    kind,
+    token: "",
+    login: "",
+    password: "",
+    dailyLimitGb: "",
+    keyDailyLimitGbById: {},
+    megaAccounts: [{ login: "user@x", password: "pw" }],
+    megaNewLogin: "",
+    megaNewPassword: "",
+    megaDisabledIds: []
+  };
+}
+
+describe("applyAccountDialogToSettings — keeps the user's Mega preferApi choice", () => {
+  it("does not flip megaDebridPreferApi to true when editing the API account", () => {
+    const settings = { ...defaultSettings(), megaDebridApiEnabled: true, megaDebridWebEnabled: true, megaDebridPreferApi: false };
+    const next = applyAccountDialogToSettings(settings, megaDialog("megadebrid-api"));
+    expect(next.megaDebridApiEnabled).toBe(true);
+    expect(next.megaDebridPreferApi).toBe(false);
+  });
+
+  it("does not flip megaDebridPreferApi to false when editing the Web account", () => {
+    const settings = { ...defaultSettings(), megaDebridApiEnabled: true, megaDebridWebEnabled: true, megaDebridPreferApi: true };
+    const next = applyAccountDialogToSettings(settings, megaDialog("megadebrid-web"));
+    expect(next.megaDebridWebEnabled).toBe(true);
+    expect(next.megaDebridPreferApi).toBe(true);
+  });
+});

tests/backup-mcp.test.ts

@@ -0,0 +1,232 @@
+import fs from "node:fs";
+import http from "node:http";
+import os from "node:os";
+import path from "node:path";
+import { once } from "node:events";
+import { afterEach, describe, expect, it } from "vitest";
+
+import { buildBackupPayload, resolveMcpRemoteRestore, BackupMcpRemote } from "../src/main/backup-payload";
+import { defaultSettings } from "../src/main/constants";
+import { normalizeSettings } from "../src/main/storage";
+import {
+  startDebugServer,
+  stopDebugServer,
+  restartDebugServer,
+  writeDebugServerConfig,
+  getDebugAllowlist,
+  getDebugServerRuntimeStatus
+} from "../src/main/debug-server";
+import type { DownloadManager } from "../src/main/download-manager";
+import type { AppSettings, SessionState } from "../src/shared/types";
+
+const tempDirs: string[] = [];
+
+function input(settingsOverride: Partial<AppSettings>, mcpRemote?: BackupMcpRemote) {
+  return {
+    settings: { ...defaultSettings(), ...settingsOverride } as AppSettings,
+    appVersion: "1.7.224",
+    exportedAt: "2026-06-19T00:00:00.000Z",
+    session: {} as unknown as SessionState,
+    history: [],
+    mcpRemote
+  };
+}
+
+async function getFreePort(): Promise<number> {
+  const probe = http.createServer();
+  probe.listen(0, "127.0.0.1");
+  await once(probe, "listening");
+  const address = probe.address();
+  if (!address || typeof address === "string") {
+    throw new Error("port probe failed");
+  }
+  probe.close();
+  await once(probe, "close");
+  return address.port;
+}
+
+async function waitForReady(url: string): Promise<void> {
+  const deadline = Date.now() + 5000;
+  while (Date.now() < deadline) {
+    try {
+      const res = await fetch(url);
+      if (res.ok) {
+        return;
+      }
+    } catch {
+    }
+    await new Promise((resolve) => setTimeout(resolve, 40));
+  }
+  throw new Error(`debug server not ready: ${url}`);
+}
+
+afterEach(() => {
+  stopDebugServer();
+  while (tempDirs.length > 0) {
+    const dir = tempDirs.pop();
+    if (!dir) {
+      continue;
+    }
+    try {
+      fs.rmSync(dir, { recursive: true, force: true });
+    } catch {
+    }
+  }
+});
+
+describe("backup mcpRemote export gating", () => {
+  it("includes mcpRemote when backupIncludeMcp is on", () => {
+    const section: BackupMcpRemote = { allowlist: ["10.0.0.5", "192.168.1.0/24"], port: 9999, hostMode: "network" };
+    const payload = buildBackupPayload(input({ backupIncludeMcp: true }, section));
+    expect(payload.mcpRemote).toEqual(section);
+  });
+
+  it("omits mcpRemote when the toggle is off even if a section is provided", () => {
+    const payload = buildBackupPayload(input({ backupIncludeMcp: false }, { allowlist: ["10.0.0.5"], port: 9868, hostMode: "network" }));
+    expect(payload.mcpRemote).toBeUndefined();
+  });
+
+  it("omits mcpRemote when toggle on but no section gathered", () => {
+    const payload = buildBackupPayload(input({ backupIncludeMcp: true }, undefined));
+    expect(payload.mcpRemote).toBeUndefined();
+  });
+
+  it("the mcpRemote section carries ONLY allowlist/port/hostMode (no token, publicHost, name)", () => {
+    const payload = buildBackupPayload(input({ backupIncludeMcp: true }, { allowlist: ["10.0.0.5"], port: 9868, hostMode: "network" }));
+    expect(payload.mcpRemote && Object.keys(payload.mcpRemote).sort()).toEqual(["allowlist", "hostMode", "port"]);
+    const sectionJson = JSON.stringify(payload.mcpRemote);
+    expect(sectionJson.toLowerCase()).not.toContain("token");
+    expect(sectionJson).not.toContain("publicHost");
+    expect(sectionJson.toLowerCase()).not.toContain("\"name\"");
+  });
+});
+
+describe("backupIncludeMcp settings persistence", () => {
+  it("normalizeSettings preserves backupIncludeMcp (the toggle survives save/load)", () => {
+    expect(normalizeSettings({ backupIncludeMcp: true } as unknown as AppSettings).backupIncludeMcp).toBe(true);
+    expect(normalizeSettings({ backupIncludeMcp: false } as unknown as AppSettings).backupIncludeMcp).toBe(false);
+    expect(normalizeSettings({} as unknown as AppSettings).backupIncludeMcp).toBe(false);
+  });
+});
+
+describe("resolveMcpRemoteRestore", () => {
+  it("maps network + non-empty allowlist to 0.0.0.0", () => {
+    expect(resolveMcpRemoteRestore({ allowlist: ["10.0.0.5"], port: 9868, hostMode: "network" }))
+      .toEqual({ host: "0.0.0.0", port: 9868, allowlist: ["10.0.0.5"] });
+  });
+
+  it("SAFETY: network with EMPTY allowlist binds local, never 0.0.0.0", () => {
+    expect(resolveMcpRemoteRestore({ allowlist: [], port: 9868, hostMode: "network" })?.host).toBe("127.0.0.1");
+  });
+
+  it("maps local to 127.0.0.1", () => {
+    expect(resolveMcpRemoteRestore({ allowlist: ["10.0.0.5"], port: 9868, hostMode: "local" })?.host).toBe("127.0.0.1");
+  });
+
+  it("rejects an out-of-range or non-integer port", () => {
+    expect(resolveMcpRemoteRestore({ allowlist: ["10.0.0.5"], port: 80, hostMode: "network" })?.port).toBeUndefined();
+    expect(resolveMcpRemoteRestore({ allowlist: ["10.0.0.5"], port: 70000, hostMode: "network" })?.port).toBeUndefined();
+    expect(resolveMcpRemoteRestore({ allowlist: ["10.0.0.5"], port: 9868.5, hostMode: "network" })?.port).toBeUndefined();
+  });
+
+  it("filters non-string and blank allowlist entries and trims", () => {
+    const r = resolveMcpRemoteRestore({ allowlist: ["10.0.0.5", "", "  ", 5, null, " 8.8.8.8 "], port: 9868, hostMode: "network" });
+    expect(r?.allowlist).toEqual(["10.0.0.5", "8.8.8.8"]);
+  });
+
+  it("returns null for missing or empty/invalid sections", () => {
+    expect(resolveMcpRemoteRestore(undefined)).toBeNull();
+    expect(resolveMcpRemoteRestore(null)).toBeNull();
+    expect(resolveMcpRemoteRestore("x")).toBeNull();
+    expect(resolveMcpRemoteRestore({})).toBeNull();
+  });
+});
+
+describe("backup mcpRemote live restore round-trip", () => {
+  it("export -> resolve -> apply is reflected in the running debug-server (proves restart fired)", async () => {
+    const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-bkmcp-"));
+    tempDirs.push(baseDir);
+    const startPort = await getFreePort();
+    const restorePort = await getFreePort();
+    fs.writeFileSync(path.join(baseDir, "debug_token.txt"), "rt-secret", "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_port.txt"), String(startPort), "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_host.txt"), "127.0.0.1", "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_allowlist.txt"), "", "utf8");
+    startDebugServer({} as unknown as DownloadManager, baseDir);
+    await waitForReady(`http://127.0.0.1:${startPort}/health?token=rt-secret`);
+    expect(getDebugAllowlist()).toEqual([]);
+
+    const payload = buildBackupPayload(input(
+      { backupIncludeMcp: true },
+      { allowlist: ["203.0.113.4", "10.0.0.0/24"], port: restorePort, hostMode: "network" }
+    ));
+
+    const restore = resolveMcpRemoteRestore(payload.mcpRemote);
+    expect(restore).not.toBeNull();
+    writeDebugServerConfig({ host: restore!.host, port: restore!.port, allowlist: restore!.allowlist });
+    const status = await restartDebugServer();
+
+    expect(getDebugAllowlist()).toEqual(["203.0.113.4", "10.0.0.0/24"]);
+    expect(status.port).toBe(restorePort);
+    expect(status.host).toBe("0.0.0.0");
+    expect(status.allowlistCount).toBe(2);
+
+    expect(fs.readFileSync(path.join(baseDir, "debug_token.txt"), "utf8").trim()).toBe("rt-secret");
+    expect(fs.existsSync(path.join(baseDir, "debug_remote.json"))).toBe(false);
+
+    await waitForReady(`http://127.0.0.1:${restorePort}/health?token=rt-secret`);
+  });
+
+  it("full-backup path writes the debug_* files to disk without a restart (boot picks them up)", async () => {
+    const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-bkmcp2-"));
+    tempDirs.push(baseDir);
+    const startPort = await getFreePort();
+    fs.writeFileSync(path.join(baseDir, "debug_token.txt"), "rt2", "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_port.txt"), String(startPort), "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_host.txt"), "127.0.0.1", "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_allowlist.txt"), "", "utf8");
+    startDebugServer({} as unknown as DownloadManager, baseDir);
+    await waitForReady(`http://127.0.0.1:${startPort}/health?token=rt2`);
+
+    const restore = resolveMcpRemoteRestore({ allowlist: ["198.51.100.9"], port: 9100, hostMode: "network" });
+    writeDebugServerConfig({ host: restore!.host, port: restore!.port, allowlist: restore!.allowlist });
+
+    expect(fs.readFileSync(path.join(baseDir, "debug_host.txt"), "utf8").trim()).toBe("0.0.0.0");
+    expect(fs.readFileSync(path.join(baseDir, "debug_port.txt"), "utf8").trim()).toBe("9100");
+    expect(fs.readFileSync(path.join(baseDir, "debug_allowlist.txt"), "utf8")).toContain("198.51.100.9");
+    expect(getDebugServerRuntimeStatus().port).toBe(startPort);
+  });
+});
+
+describe("debug-server live diagnostics endpoints", () => {
+  it("serves /providers (live cooldown/runtime snapshot) and /logs/conversion over authenticated HTTP", async () => {
+    const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-prov-"));
+    tempDirs.push(baseDir);
+    const port = await getFreePort();
+    fs.writeFileSync(path.join(baseDir, "debug_token.txt"), "prov-secret", "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_port.txt"), String(port), "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_host.txt"), "127.0.0.1", "utf8");
+    fs.writeFileSync(path.join(baseDir, "debug_allowlist.txt"), "", "utf8");
+    startDebugServer({} as unknown as DownloadManager, baseDir);
+    await waitForReady(`http://127.0.0.1:${port}/health?token=prov-secret`);
+
+    const provRes = await fetch(`http://127.0.0.1:${port}/providers?token=prov-secret`);
+    expect(provRes.status).toBe(200);
+    const prov = await provRes.json();
+    expect(typeof prov.capturedAtMs).toBe("number");
+    expect(prov.megaDebrid).toBeTruthy();
+    expect(Array.isArray(prov.megaDebrid.accounts)).toBe(true);
+    expect(typeof prov.megaDebrid.rotationCursor).toBe("number");
+    expect(prov.debridLink).toBeTruthy();
+    expect(Array.isArray(prov.debridLink.keys)).toBe(true);
+
+    const unauth = await fetch(`http://127.0.0.1:${port}/providers`);
+    expect(unauth.status).toBe(401);
+
+    const convRes = await fetch(`http://127.0.0.1:${port}/logs/conversion?token=prov-secret`);
+    expect(convRes.status).toBe(200);
+    const conv = await convRes.json();
+    expect(Array.isArray(conv.lines)).toBe(true);
+    expect(conv).toHaveProperty("available");
+  });
+});

tests/connection-code.test.ts

@@ -0,0 +1,42 @@
+import { describe, it, expect } from "vitest";
+import { encodeConnectionCode } from "../src/main/connection-code";
+import { decodeConnectionCode } from "../tools/rd-diagnostics-mcp/src/code.mjs";
+
+describe("connection-code", () => {
+  it("round-trips through the bridge decoder", () => {
+    const code = encodeConnectionCode({ host: "203.0.113.5", port: 9868, token: "deadbeef", name: "server-1" });
+    expect(code.startsWith("rddiag:v1:")).toBe(true);
+    const decoded = decodeConnectionCode(code);
+    expect(decoded.host).toBe("203.0.113.5");
+    expect(decoded.port).toBe(9868);
+    expect(decoded.token).toBe("deadbeef");
+    expect(decoded.name).toBe("server-1");
+    expect(decoded.scheme).toBe("http");
+  });
+
+  it("carries https scheme and fingerprint when set", () => {
+    const code = encodeConnectionCode({
+      host: "diag.example.com",
+      port: 8443,
+      token: "abc",
+      scheme: "https",
+      fingerprint: "AA:BB:CC"
+    });
+    const decoded = decodeConnectionCode(code);
+    expect(decoded.scheme).toBe("https");
+    expect(decoded.fingerprint).toBe("AA:BB:CC");
+  });
+
+  it("omits scheme key for plain http (default)", () => {
+    const code = encodeConnectionCode({ host: "10.0.0.2", port: 9868, token: "t" });
+    const json = JSON.parse(Buffer.from(code.slice("rddiag:v1:".length).replace(/-/g, "+").replace(/_/g, "/"), "base64").toString("utf8"));
+    expect(json.s).toBeUndefined();
+    expect(json).toMatchObject({ v: 1, h: "10.0.0.2", p: 9868, t: "t" });
+  });
+
+  it("rejects invalid input", () => {
+    expect(() => encodeConnectionCode({ host: "", port: 9868, token: "t" })).toThrow();
+    expect(() => encodeConnectionCode({ host: "h", port: 0, token: "t" })).toThrow();
+    expect(() => encodeConnectionCode({ host: "h", port: 9868, token: "" })).toThrow();
+  });
+});

tests/debrid.test.ts

@@ -3,7 +3,8 @@ import { defaultSettings, REQUEST_RETRIES } from "../src/main/constants";
 import { parseDebridLinkApiKeys } from "../src/shared/debrid-link-keys";
 import { getMegaDebridAccountId } from "../src/shared/mega-debrid-accounts";
 import { getProviderUsageDayKey } from "../src/shared/provider-daily-limits";
-import { clearMegaDebridEmptyResponseStreak, DebridService, extractRapidgatorFilenameFromHtml, fetchAllDebridHostInfo, fetchDebridLinkHostLimits, filenameFromRapidgatorUrlPath, getDebridLinkKeyRuntimeStateForTests, getMegaDebridAccountCooldownState, MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART, MEGA_DEBRID_STICKY_LINKS, normalizeResolvedFilename, primeMegaDebridUntilRestartForTests, recordMegaDebridEmptyResponseStreak, resetDebridLinkRuntimeStateForTests, resetMegaDebridRuntimeStateForTests } from "../src/main/debrid";
+import { isMegaDebridTransientResolveFailure } from "../src/shared/mega-debrid-errors";
+import { classifyMegaDebridAccountFailureForTests, clearMegaDebridEmptyResponseStreak, DebridService, extractRapidgatorFilenameFromHtml, fetchAllDebridHostInfo, fetchDebridLinkHostLimits, filenameFromRapidgatorUrlPath, getDebridLinkKeyCooldownStateForTests, getDebridLinkKeyRuntimeStateForTests, getMegaDebridAccountCooldownState, getProviderRuntimeSnapshot, leadProviderChainWith, MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART, MEGA_DEBRID_STICKY_LINKS, normalizeResolvedFilename, primeMegaDebridRuntimeCooldownForTests, primeMegaDebridUntilRestartForTests, recordMegaDebridEmptyResponseStreak, resetDebridLinkRuntimeStateForTests, resetMegaDebridRuntimeStateForTests } from "../src/main/debrid";
 
 const originalFetch = globalThis.fetch;
 
@@ -15,6 +16,21 @@ afterEach(() => {
   vi.restoreAllMocks();
 });
 
+describe("leadProviderChainWith", () => {
+  it("leaves the order unchanged when no preferred provider is given", () => {
+    expect(leadProviderChainWith(["realdebrid", "debridlink", "alldebrid"], null)).toEqual(["realdebrid", "debridlink", "alldebrid"]);
+    expect(leadProviderChainWith(["realdebrid", "debridlink"], undefined)).toEqual(["realdebrid", "debridlink"]);
+  });
+
+  it("leads with the preferred provider but keeps every other provider as a later fallback", () => {
+    expect(leadProviderChainWith(["realdebrid", "debridlink", "alldebrid"], "alldebrid")).toEqual(["alldebrid", "realdebrid", "debridlink"]);
+  });
+
+  it("does not drop or strand any provider when the preferred one is not in the order", () => {
+    expect(leadProviderChainWith(["realdebrid", "debridlink"], "alldebrid")).toEqual(["realdebrid", "debridlink"]);
+  });
+});
+
 describe("debrid service", () => {
   it("falls back to Mega web when Real-Debrid fails", async () => {
     const settings = {
@@ -134,6 +150,44 @@ describe("debrid service", () => {
     expect(calledUrls.some((url) => url.includes("api.real-debrid.com/rest/1.0/unrestrict/link"))).toBe(false);
   });
 
+  it("leads the provider chain with the preferred (non-cooled) provider when one is hinted", async () => {
+    const settings = {
+      ...defaultSettings(),
+      token: "rd-token",
+      debridLinkApiKeys: "dl-token",
+      providerOrder: ["realdebrid", "debridlink"] as const,
+      providerPrimary: "realdebrid" as const,
+      providerSecondary: "debridlink" as const,
+      providerTertiary: "none" as const,
+      autoProviderFallback: true
+    };
+
+    globalThis.fetch = (async (input: RequestInfo | URL): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("debrid-link.com/api/v2/downloader/add")) {
+        return new Response(JSON.stringify({
+          success: true,
+          value: { downloadUrl: "https://debrid-link.example/file.bin", name: "file.bin", size: 1234 }
+        }), { status: 200, headers: { "Content-Type": "application/json" } });
+      }
+      if (url.includes("api.real-debrid.com/rest/1.0/unrestrict/link")) {
+        return new Response(JSON.stringify({
+          download: "https://rd.example/file.bin",
+          filename: "file.bin",
+          filesize: 1234
+        }), { status: 200, headers: { "Content-Type": "application/json" } });
+      }
+      return new Response("not-found", { status: 404 });
+    }) as typeof fetch;
+
+    const service = new DebridService(settings);
+    const control = await service.unrestrictLink("https://hoster.example/lead-control.bin");
+    expect(control.provider).toBe("realdebrid");
+
+    const preferred = await service.unrestrictLink("https://hoster.example/lead-pref.bin", undefined, undefined, "debridlink");
+    expect(preferred.provider).toBe("debridlink");
+  });
+
   it("uses the next Debrid-Link key when the first key hit its local daily limit", async () => {
     const keys = parseDebridLinkApiKeys("dl-key-one\ndl-key-two");
     let usedAuthHeader = "";
@@ -519,6 +573,78 @@ describe("debrid service", () => {
     expect(getDebridLinkKeyRuntimeStateForTests(key2Id)).toBe("ready");
   });
 
+  it("does NOT cool down a Debrid-Link key on a quick user-cancel abort (below the min-run threshold)", async () => {
+    const settings = {
+      ...defaultSettings(),
+      token: "",
+      bestToken: "",
+      allDebridToken: "",
+      megaLogin: "",
+      megaPassword: "",
+      megaCredentials: "",
+      debridLinkApiKeys: "dl-key-one",
+      providerOrder: ["debridlink"] as const,
+      providerPrimary: "debridlink" as const,
+      providerSecondary: "none" as const,
+      providerTertiary: "none" as const,
+      autoProviderFallback: false
+    };
+    const controller = new AbortController();
+    globalThis.fetch = (async (input: RequestInfo | URL): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("/downloader/add")) {
+        controller.abort();
+        throw new Error("aborted");
+      }
+      return new Response("not-found", { status: 404 });
+    }) as typeof fetch;
+
+    const keyId = parseDebridLinkApiKeys("dl-key-one")[0].id;
+    const service = new DebridService(settings);
+    await expect(
+      service.unrestrictLink("https://rapidgator.net/file/dl-quick-cancel", controller.signal)
+    ).rejects.toThrow();
+
+    expect(getDebridLinkKeyCooldownStateForTests(keyId)).toBeNull();
+  });
+
+  it("cools down a Debrid-Link key on an abort that ran long enough (retry rotates to the next key)", async () => {
+    process.env.RD_MEGA_ABORT_MIN_RUN_MS = "0";
+    const settings = {
+      ...defaultSettings(),
+      token: "",
+      bestToken: "",
+      allDebridToken: "",
+      megaLogin: "",
+      megaPassword: "",
+      megaCredentials: "",
+      debridLinkApiKeys: "dl-key-one",
+      providerOrder: ["debridlink"] as const,
+      providerPrimary: "debridlink" as const,
+      providerSecondary: "none" as const,
+      providerTertiary: "none" as const,
+      autoProviderFallback: false
+    };
+    const controller = new AbortController();
+    globalThis.fetch = (async (input: RequestInfo | URL): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("/downloader/add")) {
+        controller.abort();
+        throw new Error("aborted");
+      }
+      return new Response("not-found", { status: 404 });
+    }) as typeof fetch;
+
+    const keyId = parseDebridLinkApiKeys("dl-key-one")[0].id;
+    const service = new DebridService(settings);
+    await expect(
+      service.unrestrictLink("https://rapidgator.net/file/dl-long-abort", controller.signal)
+    ).rejects.toThrow();
+
+    const cooldown = getDebridLinkKeyCooldownStateForTests(keyId);
+    expect(cooldown?.remainingMs ?? 0).toBeGreaterThan(60_000);
+  });
+
   it("treats bad Debrid-Link file passwords as fatal and does not rotate keys", async () => {
     const settings = {
       ...defaultSettings(),
@@ -1908,9 +2034,113 @@ describe("debrid service", () => {
     expect(result.directUrl).toBe("https://mega-web.example/ok.rar");
   }, 20000);
 
+  it("setzt KEINEN Account-Cooldown, wenn der Mega-Web-Abbruch nur ein Queue-Timeout war (Account war belegt, nicht ungesund)", async () => {
+    process.env.RD_MEGA_ABORT_MIN_RUN_MS = "0";
+    const settings = {
+      ...defaultSettings(),
+      token: "",
+      bestToken: "",
+      allDebridToken: "",
+      megaLogin: "user",
+      megaPassword: "pass",
+      megaCredentials: "user:pass",
+      megaDebridPreferApi: false,
+      providerOrder: [] as const,
+      providerPrimary: "megadebrid" as const,
+      providerSecondary: "none" as const,
+      providerTertiary: "none" as const,
+      autoProviderFallback: false
+    };
+    globalThis.fetch = (async () => new Response("error", { status: 500 })) as typeof fetch;
+
+    const controller = new AbortController();
+    let calls = 0;
+    const megaWeb = vi.fn(async () => {
+      calls += 1;
+      controller.abort("caller-timeout");
+      throw new Error("Mega-Web Queue-Timeout (abgebrochen nach 60s Wartezeit, Account war belegt)");
+    });
+
+    const service = new DebridService(settings, { megaWebUnrestrict: megaWeb });
+    await expect(
+      service.unrestrictLink("https://rapidgator.net/file/queue-timeout-no-cooldown", controller.signal)
+    ).rejects.toThrow();
+
+    const key = `${getMegaDebridAccountId("user")}:web`;
+    expect(getMegaDebridAccountCooldownState(key)).toBeNull();
+    expect(calls).toBeGreaterThanOrEqual(1);
+  }, 20000);
+
+  it("getProviderRuntimeSnapshot surfaces a live Mega-Debrid account cooldown (until/remaining/reason) for the diagnostics endpoint", () => {
+    const accId = getMegaDebridAccountId("user");
+    const key = `${accId}:web`;
+    expect(getProviderRuntimeSnapshot().megaDebrid.accounts.find((a) => a.key === key)?.cooldown ?? null).toBeNull();
+
+    primeMegaDebridRuntimeCooldownForTests(key, 90_000, "Abbruch/Timeout nach 60s");
+
+    const snap = getProviderRuntimeSnapshot();
+    expect(typeof snap.capturedAtMs).toBe("number");
+    const acc = snap.megaDebrid.accounts.find((a) => a.key === key);
+    expect(acc).toBeTruthy();
+    expect(acc!.cooldown).not.toBeNull();
+    expect(acc!.cooldown!.remainingMs).toBeGreaterThan(0);
+    expect(acc!.cooldown!.remainingMs).toBeLessThanOrEqual(90_000);
+    expect(acc!.cooldown!.untilMs).toBeGreaterThan(snap.capturedAtMs);
+    expect(acc!.cooldown!.message).toContain("Abbruch");
+  });
+
+  it("single Mega-Debrid account: a long Web abort parks only the slow link and does NOT freeze the sole account", async () => {
+    process.env.RD_MEGA_ABORT_MIN_RUN_MS = "0";
+    const settings = {
+      ...defaultSettings(),
+      token: "",
+      bestToken: "",
+      allDebridToken: "",
+      megaLogin: "user",
+      megaPassword: "pass",
+      megaCredentials: "user:pass",
+      megaDebridPreferApi: false,
+      providerOrder: [] as const,
+      providerPrimary: "megadebrid" as const,
+      providerSecondary: "none" as const,
+      providerTertiary: "none" as const,
+      autoProviderFallback: false
+    };
+    globalThis.fetch = (async () => new Response("error", { status: 500 })) as typeof fetch;
+
+    const controller = new AbortController();
+    let calls = 0;
+    const megaWeb = vi.fn((): Promise<{ fileName: string; directUrl: string; fileSize: number | null; retriesUsed: number }> => {
+      calls += 1;
+      if (calls === 1) {
+        controller.abort("simulated-60s-timeout");
+        return Promise.reject(new Error("aborted"));
+      }
+      return Promise.resolve({
+        fileName: "healthy.rar",
+        directUrl: "https://www11.unrestrict.link/download/file/ok/healthy.rar",
+        fileSize: null,
+        retriesUsed: 0
+      });
+    });
+
+    const service = new DebridService(settings, { megaWebUnrestrict: megaWeb });
+
+    const err = await service.unrestrictLink("https://rapidgator.net/file/slow-link.rar.html", controller.signal).then(() => null, (e: unknown) => e);
+    expect(err).toBeTruthy();
+    expect(String(err)).toMatch(/mega_debrid_slow_link:\d+:/i);
+
+    const key = `${getMegaDebridAccountId("user")}:web`;
+    expect(getMegaDebridAccountCooldownState(key)).toBeNull();
+
+    const second = await service.unrestrictLink("https://rapidgator.net/file/healthy.rar.html");
+    expect(second.provider).toBe("megadebrid");
+    expect(calls).toBeGreaterThanOrEqual(2);
+  }, 20000);
+
   it("escalates a Mega-Debrid account to 'until restart' after the empty-response streak threshold", () => {
     const key = `${getMegaDebridAccountId("user1")}:web`;
-    expect(MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART).toBe(3);
+    expect(MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART).toBe(10);
     expect(recordMegaDebridEmptyResponseStreak(key)).toBe(1);
     expect(recordMegaDebridEmptyResponseStreak(key)).toBe(2);
     expect(recordMegaDebridEmptyResponseStreak(key)).toBe(3);
@@ -1918,13 +2148,32 @@ describe("debrid service", () => {
     expect(recordMegaDebridEmptyResponseStreak(key)).toBe(1);
   });
 
-  it("keeps an 'until restart' park active forever (never expires until process restart)", () => {
+  it("self-heals a daily-limit park after the daily reset instead of staying locked until process restart", () => {
     const key = `${getMegaDebridAccountId("user1")}:api`;
     primeMegaDebridUntilRestartForTests(key);
-    const now = getMegaDebridAccountCooldownState(key);
-    expect(now?.untilRestart).toBe(true);
-    const farFuture = Date.now() + 100 * 24 * 60 * 60 * 1000;
-    expect(getMegaDebridAccountCooldownState(key, farFuture)?.untilRestart).toBe(true);
+    const active = getMegaDebridAccountCooldownState(key);
+    expect(active?.untilRestart).toBe(true);
+    expect(getMegaDebridAccountCooldownState(key, Date.now() + 60_000)?.untilRestart).toBe(true);
+    const afterReset = Date.now() + 25 * 60 * 60 * 1000;
+    expect(getMegaDebridAccountCooldownState(key, afterReset)).toBeNull();
+  });
+
+  it("does NOT treat a per-hoster 'no server' failure as an account daily-limit signal (no until-restart park)", () => {
+    const noServer = classifyMegaDebridAccountFailureForTests(new Error("no server available for this host"));
+    expect(noServer.limitSignal).toBeFalsy();
+    expect(noServer.category).toBe("quota");
+    expect(noServer.cooldownMs).toBeGreaterThan(0);
+
+    const genuineEmpty = classifyMegaDebridAccountFailureForTests(new Error("Antwort leer"));
+    expect(genuineEmpty.limitSignal).toBe(true);
+  });
+
+  it("classifies an empty Mega-Debrid API result ('Linkgenerierung lieferte kein Ergebnis') as a fast transient, not a 30s cooldown", () => {
+    const result = classifyMegaDebridAccountFailureForTests(new Error("Mega-Debrid API: Linkgenerierung lieferte kein Ergebnis"));
+    expect(result.fatal).toBe(false);
+    expect(result.cooldownMs).toBe(0);
+    expect(result.limitSignal).toBeFalsy();
+    expect(isMegaDebridTransientResolveFailure(result.message)).toBe(true);
   });
 
   it("skips a Mega-Debrid account parked until restart and rotates to the next, without re-testing it", async () => {
@@ -1963,7 +2212,7 @@ describe("debrid service", () => {
     expect((result as { sourceAccountId?: string }).sourceAccountId).toBe(getMegaDebridAccountId("user2"));
   }, 20000);
 
-  it("fails terminally (no retry timer) when ALL Mega-Debrid accounts are parked until restart", async () => {
+  it("emits an until-Tagesreset park token (so the manager parks, not 2min-retries) when ALL Mega-Debrid accounts are parked until restart", async () => {
     const settings = {
       ...defaultSettings(),
       token: "",
@@ -1990,7 +2239,10 @@ describe("debrid service", () => {
     const megaWeb = vi.fn(async () => ({ fileName: "x.rar", directUrl: "https://mega-web.example/x.rar", fileSize: null, retriesUsed: 0 }));
     const service = new DebridService(settings, { megaWebUnrestrict: megaWeb });
 
-    await expect(service.unrestrictLink("https://rapidgator.net/file/all-parked-test")).rejects.toThrow(/bis Neustart gesperrt/i);
+    const err = await service.unrestrictLink("https://rapidgator.net/file/all-parked-test").then(() => null, (e: unknown) => e as Error);
+    expect(err).toBeInstanceOf(Error);
+    expect(err!.message).toMatch(/bis zum Tagesreset gesperrt/i);
+    expect(err!.message).toMatch(/mega_debrid_reset_park:\d+:/);
     expect(megaWeb).not.toHaveBeenCalled();
   }, 20000);
 
@@ -2013,8 +2265,9 @@ describe("debrid service", () => {
     globalThis.fetch = (async () => new Response("error", { status: 500 })) as typeof fetch;
 
     const key = `${getMegaDebridAccountId("user1")}:web`;
-    recordMegaDebridEmptyResponseStreak(key);
-    recordMegaDebridEmptyResponseStreak(key);
+    for (let i = 0; i < MEGA_DEBRID_EMPTY_STREAK_UNTIL_RESTART - 1; i += 1) {
+      recordMegaDebridEmptyResponseStreak(key);
+    }
     expect(getMegaDebridAccountCooldownState(key)?.untilRestart ?? false).toBe(false);
 
     const megaWeb = vi.fn(async () => null);

tests/debug-server-allowlist.test.ts

@@ -0,0 +1,146 @@
+import fs from "node:fs";
+import http from "node:http";
+import os from "node:os";
+import path from "node:path";
+import { once } from "node:events";
+import { afterEach, describe, expect, it } from "vitest";
+
+import {
+  startDebugServer,
+  stopDebugServer,
+  restartDebugServer,
+  writeDebugServerConfig,
+  getDebugServerRuntimeStatus,
+  evaluateClientAllowed,
+  getPeerIp
+} from "../src/main/debug-server";
+import type { DownloadManager } from "../src/main/download-manager";
+
+const tempDirs: string[] = [];
+const TOKEN = "allowlist-secret";
+
+async function getFreePort(): Promise<number> {
+  const probe = http.createServer();
+  probe.listen(0, "127.0.0.1");
+  await once(probe, "listening");
+  const address = probe.address();
+  if (!address || typeof address === "string") {
+    throw new Error("port probe failed");
+  }
+  probe.close();
+  await once(probe, "close");
+  return address.port;
+}
+
+async function waitForReady(url: string): Promise<void> {
+  const deadline = Date.now() + 5000;
+  while (Date.now() < deadline) {
+    try {
+      const res = await fetch(url);
+      if (res.ok) {
+        return;
+      }
+    } catch {
+    }
+    await new Promise((resolve) => setTimeout(resolve, 40));
+  }
+  throw new Error(`debug server not ready: ${url}`);
+}
+
+async function startWithAllowlist(allowlist: string[], host = "0.0.0.0"): Promise<{ baseUrl: string }> {
+  const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-allow-"));
+  tempDirs.push(baseDir);
+  const port = await getFreePort();
+  fs.writeFileSync(path.join(baseDir, "debug_token.txt"), TOKEN, "utf8");
+  fs.writeFileSync(path.join(baseDir, "debug_port.txt"), String(port), "utf8");
+  fs.writeFileSync(path.join(baseDir, "debug_host.txt"), host, "utf8");
+  fs.writeFileSync(path.join(baseDir, "debug_allowlist.txt"), allowlist.join("\n"), "utf8");
+  const manager = {} as unknown as DownloadManager;
+  startDebugServer(manager, baseDir);
+  const baseUrl = `http://127.0.0.1:${port}`;
+  await waitForReady(`${baseUrl}/health?token=${TOKEN}`);
+  return { baseUrl };
+}
+
+afterEach(() => {
+  stopDebugServer();
+  while (tempDirs.length > 0) {
+    const dir = tempDirs.pop();
+    if (!dir) {
+      continue;
+    }
+    try {
+      fs.rmSync(dir, { recursive: true, force: true });
+    } catch {
+    }
+  }
+});
+
+describe("debug-server allowlist matcher (pure)", () => {
+  it("always allows loopback regardless of rules", () => {
+    expect(evaluateClientAllowed("127.0.0.1", [])).toBe(true);
+    expect(evaluateClientAllowed("::1", [])).toBe(true);
+    expect(evaluateClientAllowed("::ffff:127.0.0.1", ["8.8.8.8"])).toBe(true);
+  });
+
+  it("matches an exact allowlisted IP and rejects others", () => {
+    expect(evaluateClientAllowed("8.8.8.8", ["8.8.8.8"])).toBe(true);
+    expect(evaluateClientAllowed("9.9.9.9", ["8.8.8.8"])).toBe(false);
+  });
+
+  it("matches inside a CIDR and rejects outside it", () => {
+    expect(evaluateClientAllowed("10.0.0.42", ["10.0.0.0/24"])).toBe(true);
+    expect(evaluateClientAllowed("10.0.1.42", ["10.0.0.0/24"])).toBe(false);
+  });
+
+  it("fail-closed: empty rules reject every non-loopback client", () => {
+    expect(evaluateClientAllowed("203.0.113.7", [])).toBe(false);
+    expect(evaluateClientAllowed("8.8.8.8", [])).toBe(false);
+  });
+
+  it("derives the client IP from the socket peer, never from X-Forwarded-For", () => {
+    const forgedLoopback = {
+      socket: { remoteAddress: "8.8.8.8" },
+      headers: { "x-forwarded-for": "127.0.0.1" }
+    } as unknown as http.IncomingMessage;
+    expect(getPeerIp(forgedLoopback)).toBe("8.8.8.8");
+    expect(evaluateClientAllowed(getPeerIp(forgedLoopback), [])).toBe(false);
+    expect(evaluateClientAllowed(getPeerIp(forgedLoopback), ["9.9.9.9"])).toBe(false);
+    expect(evaluateClientAllowed(getPeerIp(forgedLoopback), ["8.8.8.8"])).toBe(true);
+
+    const ipv6Mapped = {
+      socket: { remoteAddress: "::ffff:10.0.0.5" },
+      headers: {}
+    } as unknown as http.IncomingMessage;
+    expect(getPeerIp(ipv6Mapped)).toBe("10.0.0.5");
+  });
+});
+
+describe("debug-server allowlist enforcement (wired)", () => {
+  it("allows a loopback connection and ignores a spoofed X-Forwarded-For", async () => {
+    const { baseUrl } = await startWithAllowlist(["8.8.8.8"]);
+    const plain = await fetch(`${baseUrl}/health?token=${TOKEN}`);
+    expect(plain.status).toBe(200);
+    const spoofed = await fetch(`${baseUrl}/health?token=${TOKEN}`, {
+      headers: { "X-Forwarded-For": "203.0.113.9" }
+    });
+    expect(spoofed.status).toBe(200);
+  });
+
+  it("still enforces the token for loopback clients", async () => {
+    const { baseUrl } = await startWithAllowlist(["8.8.8.8"]);
+    const res = await fetch(`${baseUrl}/health`);
+    expect(res.status).toBe(401);
+  });
+
+  it("reloads the allowlist live via restartDebugServer", async () => {
+    const { baseUrl } = await startWithAllowlist(["8.8.8.8"]);
+    expect(getDebugServerRuntimeStatus().allowlistCount).toBe(1);
+    writeDebugServerConfig({ allowlist: ["9.9.9.9", "10.0.0.0/24"] });
+    const status = await restartDebugServer();
+    expect(status.running).toBe(true);
+    expect(status.allowlistCount).toBe(2);
+    await waitForReady(`${baseUrl}/health?token=${TOKEN}`);
+    expect((await fetch(`${baseUrl}/health?token=${TOKEN}`)).status).toBe(200);
+  });
+});

tests/download-manager.test.ts

@@ -14,7 +14,7 @@ import { getProviderUsageDayKey } from "../src/shared/provider-daily-limits";
 import { getItemLogPath, initItemLogs, shutdownItemLogs } from "../src/main/item-log";
 import { initPackageLogs, shutdownPackageLogs } from "../src/main/package-log";
 import { createStoragePaths, emptySession } from "../src/main/storage";
-import { primeDebridLinkRuntimeCooldownForTests, resetDebridLinkRuntimeStateForTests, primeMegaDebridRuntimeCooldownForTests, resetMegaDebridRuntimeStateForTests } from "../src/main/debrid";
+import { primeDebridLinkRuntimeCooldownForTests, resetDebridLinkRuntimeStateForTests, primeMegaDebridRuntimeCooldownForTests, resetMegaDebridRuntimeStateForTests, primeMegaDebridInFlightForTests } from "../src/main/debrid";
 import { getMegaDebridAccountId } from "../src/shared/mega-debrid-accounts";
 import { getRenameLogPath, initRenameLog, shutdownRenameLog } from "../src/main/rename-log";
 import { UnrestrictedLink } from "../src/main/realdebrid";
@@ -229,6 +229,129 @@ describe("download manager", () => {
     expect(historyEntries[0]?.downloadedBytes).toBe(90 * 1024 * 1024);
   });
 
+  it("findFallbackProviderNotInCooldown routes around cooled providers and returns null only when all are cooled", () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-fallback-route-"));
+    tempDirs.push(root);
+    const manager = new DownloadManager(
+      {
+        ...defaultSettings(),
+        token: "rd-token",
+        debridLinkApiKeys: "dl-token",
+        providerOrder: ["realdebrid", "debridlink"],
+        providerPrimary: "realdebrid",
+        providerSecondary: "debridlink",
+        providerTertiary: "none",
+        autoProviderFallback: true
+      },
+      emptySession(),
+      createStoragePaths(path.join(root, "state"))
+    );
+    const item = { id: "fb-item", url: "https://hoster.example/file.bin", provider: "realdebrid" } as any;
+
+    expect((manager as any).findFallbackProviderNotInCooldown(item)).toBe("realdebrid");
+
+    (manager as any).applyProviderBusyBackoff("realdebrid", 60000);
+    expect((manager as any).findFallbackProviderNotInCooldown(item)).toBe("debridlink");
+
+    (manager as any).applyProviderBusyBackoff("debridlink", 60000);
+    expect((manager as any).findFallbackProviderNotInCooldown(item)).toBeNull();
+  });
+
+  it("fails an item terminally instead of looping forever when the shelve fires under a finite retryLimit", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-shelve-loop-"));
+    tempDirs.push(root);
+    const storagePaths = createStoragePaths(path.join(root, "state"));
+    initPackageLogs(storagePaths.baseDir);
+    initItemLogs(storagePaths.baseDir);
+
+    const session = emptySession();
+    const packageId = "shelve-pkg";
+    const itemId = "shelve-item";
+    const outputDir = path.join(root, "downloads", "Shelve");
+    const extractDir = path.join(root, "extract", "Shelve");
+    fs.mkdirSync(outputDir, { recursive: true });
+    fs.mkdirSync(extractDir, { recursive: true });
+    session.packageOrder = [packageId];
+    session.packages[packageId] = {
+      id: packageId, name: "Shelve", outputDir, extractDir,
+      status: "downloading", itemIds: [itemId], cancelled: false, enabled: true,
+      createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+    session.items[itemId] = {
+      id: itemId, packageId, url: "https://hoster.example/flaky.bin", provider: "realdebrid",
+      status: "downloading", retries: 5, speedBps: 0, downloadedBytes: 0, totalBytes: null,
+      progressPercent: 0, fileName: "flaky.bin", targetPath: "", resumable: true,
+      attempts: 0, lastError: "", fullStatus: "", createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+
+    const manager = new DownloadManager(
+      { ...defaultSettings(), token: "rd-token", retryLimit: 5, outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract") },
+      session,
+      storagePaths
+    );
+    (manager as any).retryStateByItem.set(itemId, { freshRetryUsed: true, resumeHardResetUsed: true, stallRetries: 0, genericErrorRetries: 15, unrestrictRetries: 0 });
+    (manager as any).debridService.unrestrictLink = async () => { throw new Error("Download-Backend Fehler xyz"); };
+
+    const active = { itemId, packageId, abortController: new AbortController(), abortReason: "none", resumable: true, nonResumableCounted: false, blockedOnDiskWrite: false, blockedOnDiskSince: 0 };
+    (manager as any).activeTasks.set(itemId, active);
+
+    await (manager as any).processItem(active);
+
+    expect(session.items[itemId].status).toBe("failed");
+    expect(session.items[itemId].retries).toBeLessThan(20);
+  });
+
+  it("prefers the short Mega cooldown over the until-reset park when an aggregate error carries both tokens", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-mega-both-"));
+    tempDirs.push(root);
+    const storagePaths = createStoragePaths(path.join(root, "state"));
+    initPackageLogs(storagePaths.baseDir);
+    initItemLogs(storagePaths.baseDir);
+
+    const session = emptySession();
+    const packageId = "mega-both-pkg";
+    const itemId = "mega-both-item";
+    const outputDir = path.join(root, "downloads", "MegaBoth");
+    const extractDir = path.join(root, "extract", "MegaBoth");
+    fs.mkdirSync(outputDir, { recursive: true });
+    fs.mkdirSync(extractDir, { recursive: true });
+    session.packageOrder = [packageId];
+    session.packages[packageId] = {
+      id: packageId, name: "MegaBoth", outputDir, extractDir,
+      status: "downloading", itemIds: [itemId], cancelled: false, enabled: true,
+      createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+    session.items[itemId] = {
+      id: itemId, packageId, url: "https://rapidgator.net/file/mega-both.rar", provider: "megadebrid-api",
+      status: "downloading", retries: 0, speedBps: 0, downloadedBytes: 0, totalBytes: null,
+      progressPercent: 0, fileName: "mega-both.rar", targetPath: "", resumable: true,
+      attempts: 0, lastError: "", fullStatus: "", createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+
+    const manager = new DownloadManager(
+      { ...defaultSettings(), megaLogin: "u", megaPassword: "p", megaCredentials: "u:p", megaDebridApiEnabled: true, megaDebridWebEnabled: true, outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract") },
+      session,
+      storagePaths
+    );
+    (manager as any).retryStateByItem.set(itemId, { freshRetryUsed: true, resumeHardResetUsed: true, stallRetries: 0, genericErrorRetries: 0, unrestrictRetries: 0 });
+    (manager as any).debridService.unrestrictLink = async () => {
+      throw new Error("Unrestrict fehlgeschlagen: Mega-Debrid API: mega_debrid_reset_park:86400000:Alle Accounts bis zum Tagesreset gesperrt | Mega-Debrid Web: mega_debrid_cooldown:30000:rate limit");
+    };
+
+    const active = { itemId, packageId, abortController: new AbortController(), abortReason: "none", resumable: true, nonResumableCounted: false, blockedOnDiskWrite: false, blockedOnDiskSince: 0 };
+    (manager as any).activeTasks.set(itemId, active);
+
+    const before = Date.now();
+    await (manager as any).processItem(active);
+
+    const retryAfter = (manager as any).retryAfterByItem.get(itemId) as number;
+    expect(retryAfter).toBeGreaterThan(0);
+    const delayMs = retryAfter - before;
+    expect(delayMs).toBeLessThan(60000);
+    expect(session.items[itemId].fullStatus).toMatch(/Cooldown/i);
+    expect(session.items[itemId].fullStatus).not.toMatch(/Tagesreset/i);
+  });
+
   it("keeps the quick post-process requeue once the final package items are finished", () => {
     const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-postprocess-final-"));
     tempDirs.push(root);
@@ -1146,6 +1269,204 @@ describe("download manager", () => {
     }
   });
 
+  it("does not embed a final-attempt garbage tail across a fresh-link resume (known-total content integrity)", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-range1-"));
+    tempDirs.push(root);
+    const binary = Buffer.alloc(1024 * 1024, 0);
+    for (let i = 0; i < binary.length; i += 1) {
+      binary[i] = (i * 31 + 7) & 0xff;
+    }
+    const firstChunkBytes = 128 * 1024;
+    const injectedErrorChunk = Buffer.from("{\"error\":\"Missed session after 2000 ms\",\"success\":false}", "utf8");
+    let unrestrictCalls = 0;
+
+    const serveRange = (req: http.IncomingMessage): { start: number } => {
+      const range = String(req.headers.range || "");
+      const m = range.match(/bytes=(\d+)-/i);
+      return { start: m ? Number(m[1]) : 0 };
+    };
+
+    const server = http.createServer((req, res) => {
+      const route = req.url || "";
+      const { start } = serveRange(req);
+      if (route.startsWith("/corrupt")) {
+        if (start > 0) {
+          res.statusCode = 206;
+          res.setHeader("Content-Range", `bytes ${start}-${binary.length - 1}/${binary.length}`);
+        } else {
+          res.statusCode = 200;
+        }
+        res.setHeader("Accept-Ranges", "bytes");
+        res.setHeader("Content-Length", String(binary.length - start));
+        res.write(binary.subarray(start, Math.min(binary.length, start + firstChunkBytes)));
+        res.write(injectedErrorChunk);
+        setTimeout(() => {
+          try { res.socket?.destroy(); } catch {  }
+        }, 60);
+        return;
+      }
+      if (route.startsWith("/clean")) {
+        const chunk = binary.subarray(start);
+        if (start > 0) {
+          res.statusCode = 206;
+          res.setHeader("Content-Range", `bytes ${start}-${binary.length - 1}/${binary.length}`);
+        } else {
+          res.statusCode = 200;
+        }
+        res.setHeader("Accept-Ranges", "bytes");
+        res.setHeader("Content-Length", String(chunk.length));
+        res.end(chunk);
+        return;
+      }
+      res.statusCode = 404;
+      res.end("not-found");
+    });
+
+    server.listen(0, "127.0.0.1");
+    await once(server, "listening");
+    const address = server.address();
+    if (!address || typeof address === "string") {
+      throw new Error("server address unavailable");
+    }
+    const base = `http://127.0.0.1:${address.port}`;
+
+    globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("/unrestrict/link")) {
+        unrestrictCalls += 1;
+        const target = unrestrictCalls === 1 ? `${base}/corrupt` : `${base}/clean`;
+        return new Response(
+          JSON.stringify({ download: target, filename: "range1.mkv", filesize: binary.length }),
+          { status: 200, headers: { "Content-Type": "application/json" } }
+        );
+      }
+      return originalFetch(input, init);
+    };
+
+    try {
+      const manager = new DownloadManager(
+        {
+          ...defaultSettings(),
+          token: "rd-token",
+          outputDir: path.join(root, "downloads"),
+          extractDir: path.join(root, "extract"),
+          autoExtract: false,
+          autoReconnect: false
+        },
+        emptySession(),
+        createStoragePaths(path.join(root, "state"))
+      );
+
+      manager.addPackages([{ name: "range1", links: ["https://dummy/range1"] }]);
+      await manager.start();
+      await waitFor(() => !manager.getSnapshot().session.running, 30000);
+
+      const item = Object.values(manager.getSnapshot().session.items)[0];
+      expect(item?.status).toBe("completed");
+      expect(unrestrictCalls).toBeGreaterThanOrEqual(2);
+      const finalBytes = fs.readFileSync(item.targetPath);
+      expect(finalBytes.length).toBe(binary.length);
+      expect(finalBytes.equals(binary)).toBe(true);
+    } finally {
+      server.close();
+      await once(server, "close");
+    }
+  });
+
+  it("counts a file once in session and all-time totals across an integrity-fail retry (no telemetry double-count)", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-byteacct-"));
+    tempDirs.push(root);
+    const size = 512 * 1024;
+    const correct = Buffer.alloc(size, 0);
+    for (let i = 0; i < size; i += 1) {
+      correct[i] = (i * 17 + 3) & 0xff;
+    }
+    const wrong = Buffer.alloc(size, 0);
+    for (let i = 0; i < size; i += 1) {
+      wrong[i] = (i * 17 + 99) & 0xff;
+    }
+    const md5 = crypto.createHash("md5").update(correct).digest("hex");
+
+    const pkgDir = path.join(root, "downloads", "byteacct");
+    fs.mkdirSync(pkgDir, { recursive: true });
+    fs.writeFileSync(path.join(pkgDir, "byteacct.md5"), `${md5} *movie.mkv\n`, "utf8");
+
+    let fullServes = 0;
+    const server = http.createServer((req, res) => {
+      const range = String(req.headers.range || "");
+      const m = range.match(/bytes=(\d+)-/i);
+      const start = m ? Number(m[1]) : 0;
+      if (start === 0) {
+        fullServes += 1;
+      }
+      const body = fullServes <= 1 ? wrong : correct;
+      const chunk = body.subarray(start);
+      if (start > 0) {
+        res.statusCode = 206;
+        res.setHeader("Content-Range", `bytes ${start}-${body.length - 1}/${body.length}`);
+      } else {
+        res.statusCode = 200;
+      }
+      res.setHeader("Accept-Ranges", "bytes");
+      res.setHeader("Content-Length", String(chunk.length));
+      res.end(chunk);
+    });
+
+    server.listen(0, "127.0.0.1");
+    await once(server, "listening");
+    const address = server.address();
+    if (!address || typeof address === "string") {
+      throw new Error("server address unavailable");
+    }
+    const base = `http://127.0.0.1:${address.port}`;
+
+    globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("/unrestrict/link")) {
+        return new Response(
+          JSON.stringify({ download: `${base}/file`, filename: "movie.mkv", filesize: size }),
+          { status: 200, headers: { "Content-Type": "application/json" } }
+        );
+      }
+      return originalFetch(input, init);
+    };
+
+    try {
+      const manager = new DownloadManager(
+        {
+          ...defaultSettings(),
+          token: "rd-token",
+          outputDir: path.join(root, "downloads"),
+          extractDir: path.join(root, "extract"),
+          autoExtract: false,
+          autoReconnect: false,
+          enableIntegrityCheck: true,
+          totalDownloadedAllTime: 0
+        },
+        emptySession(),
+        createStoragePaths(path.join(root, "state"))
+      );
+
+      manager.addPackages([{ name: "byteacct", links: ["https://dummy/byteacct"] }]);
+      await manager.start();
+      await waitFor(() => !manager.getSnapshot().session.running, 30000);
+
+      const item = Object.values(manager.getSnapshot().session.items)[0];
+      expect(item?.status).toBe("completed");
+      expect(fullServes).toBeGreaterThanOrEqual(2);
+
+      const internal = manager as unknown as {
+        session: { totalDownloadedBytes: number };
+        settings: { totalDownloadedAllTime: number };
+      };
+      expect(internal.session.totalDownloadedBytes).toBe(size);
+      expect(internal.settings.totalDownloadedAllTime).toBe(size);
+    } finally {
+      server.close();
+      await once(server, "close");
+    }
+  }, 40000);
+
   it("requests a fresh direct link after repeated same-link download failures", async () => {
     const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
     tempDirs.push(root);
@@ -1888,6 +2209,98 @@ describe("download manager", () => {
     expect(fs.statSync(item.targetPath).size).toBe(binary.length);
   });
 
+  it("recovers an HTTP 416 item with a clean fresh restart after the in-budget retries are exhausted", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-416-fresh-"));
+    tempDirs.push(root);
+    const binary = Buffer.alloc(160 * 1024, 19);
+    const prevDelay = process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS;
+    process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS = "0";
+    let downloadCalls = 0;
+
+    globalThis.fetch = async (input: RequestInfo | URL): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("/unrestrict/link")) {
+        return new Response(JSON.stringify({ download: "https://dummy/direct-416-recover", filename: "fresh-416.mkv", filesize: binary.length }), { status: 200, headers: { "Content-Type": "application/json" } });
+      }
+      throw new Error(`unexpected fetch ${url}`);
+    };
+
+    try {
+      const manager = new DownloadManager(
+        { ...defaultSettings(), token: "rd-token", outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract"), retryLimit: 2, autoExtract: false, autoReconnect: false },
+        emptySession(),
+        createStoragePaths(path.join(root, "state"))
+      );
+
+      (manager as any).downloadToFile = async (_active: unknown, _directUrl: string, targetPath: string) => {
+        downloadCalls += 1;
+        if (downloadCalls <= 3) {
+          throw new Error("HTTP 416");
+        }
+        fs.mkdirSync(path.dirname(targetPath), { recursive: true });
+        fs.writeFileSync(targetPath, binary);
+        const item = Object.values((manager as any).session.items)[0] as { downloadedBytes: number; totalBytes: number; progressPercent: number } | undefined;
+        if (item) {
+          item.downloadedBytes = binary.length;
+          item.totalBytes = binary.length;
+          item.progressPercent = 100;
+        }
+        return { resumable: true };
+      };
+
+      manager.addPackages([{ name: "fresh-416", links: ["https://dummy/fresh-416"] }]);
+      await manager.start();
+      await waitFor(() => !manager.getSnapshot().session.running, 20000);
+
+      const item = Object.values(manager.getSnapshot().session.items)[0];
+      expect(item?.status).toBe("completed");
+      expect(downloadCalls).toBeGreaterThan(3);
+    } finally {
+      if (prevDelay === undefined) { delete process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS; } else { process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS = prevDelay; }
+    }
+  }, 25000);
+
+  it("bounds HTTP 416 clean restarts and finally fails instead of looping forever or stalling permanently", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-416-cap-"));
+    tempDirs.push(root);
+    const prevDelay = process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS;
+    process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS = "0";
+    let downloadCalls = 0;
+
+    globalThis.fetch = async (input: RequestInfo | URL): Promise<Response> => {
+      const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+      if (url.includes("/unrestrict/link")) {
+        return new Response(JSON.stringify({ download: "https://dummy/direct-416-forever", filename: "always-416.mkv", filesize: 1024 }), { status: 200, headers: { "Content-Type": "application/json" } });
+      }
+      throw new Error(`unexpected fetch ${url}`);
+    };
+
+    try {
+      const manager = new DownloadManager(
+        { ...defaultSettings(), token: "rd-token", outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract"), retryLimit: 0, autoExtract: false, autoReconnect: false },
+        emptySession(),
+        createStoragePaths(path.join(root, "state"))
+      );
+
+      (manager as any).downloadToFile = async () => {
+        downloadCalls += 1;
+        throw new Error("direct_link_retry_exhausted:HTTP 416");
+      };
+
+      manager.addPackages([{ name: "always-416", links: ["https://dummy/always-416"] }]);
+      await manager.start();
+      await waitFor(() => !manager.getSnapshot().session.running, 20000);
+
+      const item = Object.values(manager.getSnapshot().session.items)[0];
+      expect(item?.status).toBe("failed");
+      expect(downloadCalls).toBeGreaterThan(4);
+      expect(downloadCalls).toBeLessThan(30);
+      expect((manager as any).http416FreshRestartByItem.get(item.id)).toBeUndefined();
+    } finally {
+      if (prevDelay === undefined) { delete process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS; } else { process.env.RD_HTTP416_FRESH_RESTART_DELAY_MS = prevDelay; }
+    }
+  }, 25000);
+
   it("retries HTTP 416 in-session when using Debrid-Link API and then completes", async () => {
     const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
     tempDirs.push(root);
@@ -11923,3 +12336,200 @@ describe("download manager", () => {
     }
   });
 });
+
+describe("start conflict guard + selective resume", () => {
+  function makeItem(id: string, packageId: string, status: string, fileName: string): any {
+    return {
+      id, packageId, url: `https://hoster.example/${id}`, provider: "realdebrid",
+      status, retries: 0, speedBps: 0, downloadedBytes: status === "completed" ? 100 : 0,
+      totalBytes: status === "completed" ? 100 : null, progressPercent: status === "completed" ? 100 : 0,
+      fileName, targetPath: "", resumable: true, attempts: 0, lastError: "", fullStatus: "",
+      createdAt: Date.now(), updatedAt: Date.now()
+    };
+  }
+
+  it("does not flag a partially-downloaded package whose extract dir holds its own completed output", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-startconflict-own-"));
+    tempDirs.push(root);
+    const storagePaths = createStoragePaths(path.join(root, "state"));
+    initPackageLogs(storagePaths.baseDir);
+    initItemLogs(storagePaths.baseDir);
+
+    const session = emptySession();
+    const packageId = "pkg-own-output";
+    const extractDir = path.join(root, "extract", "OwnOutput");
+    fs.mkdirSync(extractDir, { recursive: true });
+    fs.writeFileSync(path.join(extractDir, "episode01.mkv"), Buffer.alloc(64, 7));
+    session.packageOrder = [packageId];
+    session.packages[packageId] = {
+      id: packageId, name: "OwnOutput",
+      outputDir: path.join(root, "downloads", "OwnOutput"), extractDir,
+      status: "queued", itemIds: ["own-done", "own-pending"], cancelled: false, enabled: true,
+      createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+    session.items["own-done"] = makeItem("own-done", packageId, "completed", "done.rar");
+    session.items["own-pending"] = makeItem("own-pending", packageId, "queued", "pending.rar");
+
+    const manager = new DownloadManager(
+      { ...defaultSettings(), token: "rd-token", outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract") },
+      session, storagePaths
+    );
+
+    const conflicts = await manager.getStartConflicts();
+    expect(conflicts.map((c) => c.packageId)).not.toContain(packageId);
+  });
+
+  it("flags a fresh package when its package-specific extract dir already holds files and it has no completed items", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-startconflict-fresh-"));
+    tempDirs.push(root);
+    const storagePaths = createStoragePaths(path.join(root, "state"));
+    initPackageLogs(storagePaths.baseDir);
+    initItemLogs(storagePaths.baseDir);
+
+    const session = emptySession();
+    const packageId = "pkg-fresh-conflict";
+    const extractDir = path.join(root, "extract", "FreshConflict");
+    fs.mkdirSync(extractDir, { recursive: true });
+    fs.writeFileSync(path.join(extractDir, "old-from-previous-run.mkv"), Buffer.alloc(64, 9));
+    session.packageOrder = [packageId];
+    session.packages[packageId] = {
+      id: packageId, name: "FreshConflict",
+      outputDir: path.join(root, "downloads", "FreshConflict"), extractDir,
+      status: "queued", itemIds: ["fresh-pending"], cancelled: false, enabled: true,
+      createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+    session.items["fresh-pending"] = makeItem("fresh-pending", packageId, "queued", "fresh.rar");
+
+    const manager = new DownloadManager(
+      { ...defaultSettings(), token: "rd-token", outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract") },
+      session, storagePaths
+    );
+
+    const conflicts = await manager.getStartConflicts();
+    expect(conflicts.map((c) => c.packageId)).toContain(packageId);
+  });
+
+  it("start() holds excluded packages out of the run set and runs the rest", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-selective-resume-"));
+    tempDirs.push(root);
+    const storagePaths = createStoragePaths(path.join(root, "state"));
+    initPackageLogs(storagePaths.baseDir);
+    initItemLogs(storagePaths.baseDir);
+
+    const session = emptySession();
+    const runId = "pkg-run";
+    const holdId = "pkg-hold";
+    fs.mkdirSync(path.join(root, "downloads", "RunMe"), { recursive: true });
+    fs.mkdirSync(path.join(root, "downloads", "HoldMe"), { recursive: true });
+    session.packageOrder = [runId, holdId];
+    session.packages[runId] = {
+      id: runId, name: "RunMe",
+      outputDir: path.join(root, "downloads", "RunMe"), extractDir: path.join(root, "extract", "RunMe"),
+      status: "queued", itemIds: ["run-item"], cancelled: false, enabled: true,
+      createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+    session.packages[holdId] = {
+      id: holdId, name: "HoldMe",
+      outputDir: path.join(root, "downloads", "HoldMe"), extractDir: path.join(root, "extract", "HoldMe"),
+      status: "queued", itemIds: ["hold-item"], cancelled: false, enabled: true,
+      createdAt: Date.now(), updatedAt: Date.now()
+    } as any;
+    session.items["run-item"] = makeItem("run-item", runId, "queued", "run.rar");
+    session.items["hold-item"] = makeItem("hold-item", holdId, "queued", "hold.rar");
+
+    const manager = new DownloadManager(
+      { ...defaultSettings(), token: "rd-token", maxParallel: 2, outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract") },
+      session, storagePaths
+    );
+    (manager as any).debridService.unrestrictLink = () => new Promise(() => {});
+
+    await manager.start({ excludePackageIds: new Set([holdId]) });
+
+    expect((manager as any).runPackageIds.has(runId)).toBe(true);
+    expect((manager as any).runPackageIds.has(holdId)).toBe(false);
+    expect((manager as any).runItemIds.has("run-item")).toBe(true);
+    expect((manager as any).runItemIds.has("hold-item")).toBe(false);
+    expect(session.items["hold-item"].status).toBe("queued");
+
+    manager.stop();
+  });
+});
+
+describe("mega-debrid api/web resolution overlap gate", () => {
+  function megaApiSettings(root: string): any {
+    return {
+      ...defaultSettings(),
+      megaLogin: "u", megaPassword: "p", megaCredentials: "u:p",
+      megaDebridApiEnabled: true, megaDebridWebEnabled: true, megaDebridPreferApi: true,
+      outputDir: path.join(root, "downloads"), extractDir: path.join(root, "extract")
+    };
+  }
+
+  function megaItem(id: string, status: string): any {
+    return {
+      id, packageId: "pkg", url: `https://rapidgator.net/file/${id}`, provider: "megadebrid-api",
+      status, retries: 0, speedBps: 0, downloadedBytes: 0, totalBytes: null, progressPercent: 0,
+      fileName: `${id}.rar`, targetPath: "", resumable: true, attempts: 0, lastError: "", fullStatus: "",
+      createdAt: Date.now(), updatedAt: Date.now()
+    };
+  }
+
+  function addValidating(manager: DownloadManager, session: any, ids: string[]): void {
+    for (const id of ids) {
+      session.items[id] = megaItem(id, "validating");
+      (manager as any).activeTasks.set(id, {
+        itemId: id, packageId: "pkg", abortController: new AbortController(), abortReason: "none",
+        resumable: true, nonResumableCounted: false, blockedOnDiskWrite: false, blockedOnDiskSince: 0
+      });
+    }
+  }
+
+  function buildManager(root: string, session: any): DownloadManager {
+    return new DownloadManager(megaApiSettings(root), session, createStoragePaths(path.join(root, "state")));
+  }
+
+  it("lets the first mega resolve start when nothing is in flight", () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-overlap-0-"));
+    tempDirs.push(root);
+    const session = emptySession();
+    const candidate = megaItem("cand", "queued");
+    session.items["cand"] = candidate;
+    const manager = buildManager(root, session);
+    expect((manager as any).shouldDelayStartForItem(candidate)).toBe(false);
+  });
+
+  it("serializes a second API resolve while the first is still in its API phase (no concurrent API)", () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-overlap-1-"));
+    tempDirs.push(root);
+    const session = emptySession();
+    const candidate = megaItem("cand", "queued");
+    session.items["cand"] = candidate;
+    const manager = buildManager(root, session);
+    addValidating(manager, session, ["a"]);
+    expect((manager as any).shouldDelayStartForItem(candidate)).toBe(true);
+  });
+
+  it("allows one API resolve to overlap once the first has moved to its web phase", () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-overlap-2-"));
+    tempDirs.push(root);
+    const session = emptySession();
+    const candidate = megaItem("cand", "queued");
+    session.items["cand"] = candidate;
+    const manager = buildManager(root, session);
+    addValidating(manager, session, ["a"]);
+    primeMegaDebridInFlightForTests("acc:web", 1);
+    expect((manager as any).shouldDelayStartForItem(candidate)).toBe(false);
+  });
+
+  it("caps the overlap at one API plus one web (no third concurrent resolve)", () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-overlap-3-"));
+    tempDirs.push(root);
+    const session = emptySession();
+    const candidate = megaItem("cand", "queued");
+    session.items["cand"] = candidate;
+    const manager = buildManager(root, session);
+    addValidating(manager, session, ["a", "b"]);
+    primeMegaDebridInFlightForTests("acc:web", 1);
+    expect((manager as any).shouldDelayStartForItem(candidate)).toBe(true);
+  });
+});

tests/mega-web-fallback.test.ts

@@ -314,5 +314,41 @@ describe("mega-web-fallback", () => {
         clearTimeout(timer);
       }
     });
+
+    it("klassifiziert einen Abbruch WAEHREND in der Queue als Queue-Timeout (nicht harter Abbruch), damit der belegte Account nicht bestraft wird", async () => {
+      let releaseLogin: () => void = () => {};
+      const loginGate = new Promise<void>((resolve) => { releaseLogin = resolve; });
+      globalThis.fetch = vi.fn(async (url: string | URL | Request) => {
+        const u = String(url);
+        if (u.includes("form=login")) {
+          await loginGate;
+          const headers = new Headers();
+          headers.append("set-cookie", "session=c; path=/");
+          return new Response("", { headers, status: 200 });
+        }
+        if (u.includes("page=debrideur")) return new Response('<form id="debridForm"></form>', { status: 200 });
+        if (u.includes("form=debrid")) return new Response(`<div class="acp-box"><h3>Link: https://mega.debrid/l</h3><a href="javascript:processDebrid(1,'code',0)">d</a></div>`, { status: 200 });
+        if (u.includes("ajax=debrid")) return new Response(JSON.stringify({ link: "https://mega.direct/ok" }), { status: 200 });
+        return new Response("Not found", { status: 404 });
+      }) as unknown as typeof fetch;
+
+      const fallback = new MegaWebFallback(() => ({ login: "same", password: "pw" }));
+      const firstCtrl = new AbortController();
+      const first = fallback.unrestrict("https://mega.debrid/a", firstCtrl.signal, { login: "same", password: "pw" });
+
+      await new Promise((r) => setTimeout(r, 25));
+
+      const secondCtrl = new AbortController();
+      const second = fallback.unrestrict("https://mega.debrid/b", secondCtrl.signal, { login: "same", password: "pw" });
+
+      await new Promise((r) => setTimeout(r, 25));
+      secondCtrl.abort("caller-timeout");
+
+      await expect(second).rejects.toThrow(/queue.?timeout/i);
+
+      releaseLogin();
+      await first.catch(() => null);
+      await new Promise((r) => setTimeout(r, 20));
+    }, 10000);
   });
 });

tests/storage.test.ts

@@ -180,6 +180,67 @@ describe("settings storage", () => {
     expect(webNormalized.hosterRouting.rapidgator).toBe("megadebrid-web");
   });
 
+  it("migriert eine pre-v1.6.90-Config (Mega-Creds, beide Enable-Flags fehlen) zu aktiviertem Mega-Debrid statt es still auf false zu setzen", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-store-"));
+    tempDirs.push(dir);
+    const paths = createStoragePaths(dir);
+    const legacyApi = {
+      megaLogin: "mega-user",
+      megaPassword: "mega-pass",
+      megaDebridPreferApi: true,
+      providerPrimary: "realdebrid",
+      providerSecondary: "megadebrid"
+    };
+    fs.writeFileSync(paths.configFile, JSON.stringify(legacyApi), "utf8");
+    const loadedApi = loadSettings(paths);
+    expect(loadedApi.megaDebridApiEnabled).toBe(true);
+    expect(loadedApi.megaDebridWebEnabled).toBe(false);
+
+    const dir2 = fs.mkdtempSync(path.join(os.tmpdir(), "rd-store-"));
+    tempDirs.push(dir2);
+    const paths2 = createStoragePaths(dir2);
+    const legacyWeb = {
+      megaLogin: "mega-user",
+      megaPassword: "mega-pass",
+      megaDebridPreferApi: false,
+      providerPrimary: "realdebrid",
+      providerSecondary: "megadebrid"
+    };
+    fs.writeFileSync(paths2.configFile, JSON.stringify(legacyWeb), "utf8");
+    const loadedWeb = loadSettings(paths2);
+    expect(loadedWeb.megaDebridApiEnabled).toBe(false);
+    expect(loadedWeb.megaDebridWebEnabled).toBe(true);
+  });
+
+  it("re-aktiviert KEINE bewusst deaktivierten Mega-Flags und migriert nicht ohne Mega-Creds", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-store-"));
+    tempDirs.push(dir);
+    const paths = createStoragePaths(dir);
+    const deliberatelyDisabled = {
+      megaLogin: "mega-user",
+      megaPassword: "mega-pass",
+      megaDebridPreferApi: true,
+      megaDebridApiEnabled: false,
+      megaDebridWebEnabled: false
+    };
+    fs.writeFileSync(paths.configFile, JSON.stringify(deliberatelyDisabled), "utf8");
+    const loaded = loadSettings(paths);
+    expect(loaded.megaDebridApiEnabled).toBe(false);
+    expect(loaded.megaDebridWebEnabled).toBe(false);
+
+    const dir2 = fs.mkdtempSync(path.join(os.tmpdir(), "rd-store-"));
+    tempDirs.push(dir2);
+    const paths2 = createStoragePaths(dir2);
+    const noCreds = {
+      megaDebridPreferApi: true,
+      providerPrimary: "realdebrid"
+    };
+    fs.writeFileSync(paths2.configFile, JSON.stringify(noCreds), "utf8");
+    const loadedNoCreds = loadSettings(paths2);
+    expect(loadedNoCreds.megaDebridApiEnabled).toBe(false);
+    expect(loadedNoCreds.megaDebridWebEnabled).toBe(false);
+  });
+
   it("normalizes provider daily limits and resets stale daily usage", () => {
     const [debridLinkKey] = parseDebridLinkApiKeys("dl-key-one");
     const normalized = normalizeSettings({

tests/unrestrict-retry.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { transientResolveRetryDelayMs, parseMegaDebridCooldownRetry } from "../src/main/download-manager";
+import { transientResolveRetryDelayMs, parseMegaDebridCooldownRetry, parseMegaDebridResetPark, parseMegaDebridSlowLinkRetry } from "../src/main/download-manager";
 
 describe("transientResolveRetryDelayMs (fast, bounded retry for transient resolve failures)", () => {
   it("starts fast (<= 3s) instead of the 5s..120s exponential", () => {
@@ -57,4 +57,58 @@ describe("parseMegaDebridCooldownRetry (honor the encoded account-cooldown delay
     expect(parseMegaDebridCooldownRetry("Datei beim Hoster gerade nicht abrufbar")).toBeNull();
     expect(parseMegaDebridCooldownRetry("debrid_link_cooldown:5000:x")).toBeNull();
   });
+
+  it("does NOT swallow the until-Tagesreset park token", () => {
+    expect(parseMegaDebridCooldownRetry("mega_debrid_reset_park:43200000:Alle Accounts bis zum Tagesreset gesperrt")).toBeNull();
+  });
+});
+
+describe("parseMegaDebridSlowLinkRetry (park only the slow link, never the account)", () => {
+  it("parses the encoded delay from a slow-link error", () => {
+    const r = parseMegaDebridSlowLinkRetry("mega_debrid_slow_link:120000:Mega-Debrid (Account 1/1, Su******e3): aborted");
+    expect(r).not.toBeNull();
+    expect(r!.delayMs).toBe(120000);
+    expect(r!.detail).toContain("Mega-Debrid");
+  });
+
+  it("parses it when embedded in the aggregated provider-chain error", () => {
+    const aggregated = "Provider-Kette: Mega-Debrid Web fehlgeschlagen (Error: mega_debrid_slow_link:90000:Mega-Debrid (Account 1/1): aborted)";
+    expect(parseMegaDebridSlowLinkRetry(aggregated)!.delayMs).toBe(90000);
+  });
+
+  it("clamps to [1s, 15min]", () => {
+    expect(parseMegaDebridSlowLinkRetry("mega_debrid_slow_link:1:x")!.delayMs).toBe(1000);
+    expect(parseMegaDebridSlowLinkRetry("mega_debrid_slow_link:99999999:x")!.delayMs).toBe(15 * 60 * 1000);
+  });
+
+  it("does not collide with the account-cooldown or reset-park tokens", () => {
+    expect(parseMegaDebridSlowLinkRetry("mega_debrid_cooldown:20330:x")).toBeNull();
+    expect(parseMegaDebridSlowLinkRetry("mega_debrid_reset_park:43200000:x")).toBeNull();
+    expect(parseMegaDebridCooldownRetry("mega_debrid_slow_link:120000:x")).toBeNull();
+  });
+});
+
+describe("parseMegaDebridResetPark (park the item until the Tagesreset, not a ~2min generic retry)", () => {
+  it("parses the encoded until-reset delay from the park token", () => {
+    const r = parseMegaDebridResetPark("mega_debrid_reset_park:43200000:Mega-Debrid: Alle Accounts am Tageslimit (bis zum Tagesreset gesperrt)");
+    expect(r).not.toBeNull();
+    expect(r!.delayMs).toBe(43200000);
+    expect(r!.detail).toContain("bis zum Tagesreset gesperrt");
+  });
+
+  it("parses it when embedded in the aggregated provider-chain error", () => {
+    const aggregated = "Unrestrict fehlgeschlagen: Mega-Debrid API: mega_debrid_reset_park:7200000:Alle Accounts bis zum Tagesreset gesperrt";
+    expect(parseMegaDebridResetPark(aggregated)!.delayMs).toBe(7200000);
+  });
+
+  it("is NOT clamped to the 15min cooldown ceiling (can park multiple hours)", () => {
+    expect(parseMegaDebridResetPark("mega_debrid_reset_park:21600000:x")!.delayMs).toBe(21600000);
+  });
+
+  it("clamps to a sane [1s, 26h] window and rejects junk", () => {
+    expect(parseMegaDebridResetPark("mega_debrid_reset_park:1:x")!.delayMs).toBe(1000);
+    expect(parseMegaDebridResetPark("mega_debrid_reset_park:999999999999:x")!.delayMs).toBe(26 * 60 * 60 * 1000);
+    expect(parseMegaDebridResetPark("mega_debrid_cooldown:20330:x")).toBeNull();
+    expect(parseMegaDebridResetPark("kein Token hier")).toBeNull();
+  });
 });

tests/update-install-flow.test.ts

@@ -0,0 +1,63 @@
+import { describe, expect, it } from "vitest";
+import { runInstallWithResume, InstallResumeManager } from "../src/main/update-install-flow";
+
+function makeManager(running: boolean): InstallResumeManager & { startCalls: number; stopCalls: number; persistCalls: number; sessionRunning: boolean } {
+  return {
+    sessionRunning: running,
+    startCalls: 0,
+    stopCalls: 0,
+    persistCalls: 0,
+    isSessionRunning() {
+      return this.sessionRunning;
+    },
+    stop() {
+      this.stopCalls += 1;
+      this.sessionRunning = false;
+    },
+    persistNowSync() {
+      this.persistCalls += 1;
+    },
+    async start() {
+      this.startCalls += 1;
+      this.sessionRunning = true;
+    }
+  };
+}
+
+describe("runInstallWithResume", () => {
+  it("resumes a running session when the install returns started:false", async () => {
+    const m = makeManager(true);
+    const result = await runInstallWithResume(m, async () => ({ started: false }));
+    expect(result.started).toBe(false);
+    expect(m.stopCalls).toBe(1);
+    expect(m.startCalls).toBe(1);
+    expect(m.isSessionRunning()).toBe(true);
+  });
+
+  it("resumes a running session when the install THROWS, then rethrows", async () => {
+    const m = makeManager(true);
+    await expect(
+      runInstallWithResume(m, async () => {
+        throw new Error("network down");
+      })
+    ).rejects.toThrow("network down");
+    expect(m.stopCalls).toBe(1);
+    expect(m.startCalls).toBe(1);
+    expect(m.isSessionRunning()).toBe(true);
+  });
+
+  it("does NOT resume when the install succeeds (started:true) — the app is about to quit", async () => {
+    const m = makeManager(true);
+    const result = await runInstallWithResume(m, async () => ({ started: true }));
+    expect(result.started).toBe(true);
+    expect(m.startCalls).toBe(0);
+    expect(m.isSessionRunning()).toBe(false);
+  });
+
+  it("does NOT resume when no session was running before the install", async () => {
+    const m = makeManager(false);
+    await runInstallWithResume(m, async () => ({ started: false }));
+    expect(m.stopCalls).toBe(0);
+    expect(m.startCalls).toBe(0);
+  });
+});

tests/video-processor.test.ts

@@ -92,6 +92,17 @@ describe("pickAudioTrack", () => {
     expect(d).toMatchObject({ action: "remux", audioRelIndex: 0, reason: "fallback-first-untagged" });
   });
 
+  it("tag mode does NOT let an eng track titled 'German' beat a correctly-tagged German track", () => {
+    const engTitledGerman = { language: "eng", title: "German Commentary" };
+    const d = pickAudioTrack([engTitledGerman, ger], "tag");
+    expect(d).toMatchObject({ action: "remux", audioRelIndex: 1, reason: "german-tag" });
+  });
+
+  it("tag mode does NOT pick a non-German-tagged track just because its title contains 'Deutsch'", () => {
+    const d = pickAudioTrack([{ language: "eng", title: "Deutsch entfernt" }, { language: "fre", title: "" }], "tag");
+    expect(d).toMatchObject({ action: "skip", reason: "no-german-track" });
+  });
+
   it("tag mode with single German -> single (no remux)", () => {
     expect(pickAudioTrack([ger], "tag")).toMatchObject({ action: "single" });
   });

tools/rd-diagnostics-mcp/README.md

@@ -0,0 +1,62 @@
+# rd-diagnostics-mcp
+
+Standalone **stdio MCP bridge** to the Real-Debrid-Downloader debug-server. It runs on the machine where the
+MCP client runs, takes a **connection code** for a downloader server, and exposes that server's
+read-only HTTP diagnostics API (`/diagnostics`, `/status`, `/errors`, `/logs/*`, `/accounts`, …) as MCP tools.
+One bridge serves all 5–6 servers; you pass a `code` (or a configured `server` name) per call.
+
+This bridge is **not** bundled into the Electron app and adds **no** dependencies to it.
+
+## Setup
+
+```bash
+cd tools/rd-diagnostics-mcp
+npm install
+```
+
+Register it with your MCP client as a stdio server that launches the bridge:
+
+```bash
+node "<repo>/tools/rd-diagnostics-mcp/src/bridge.mjs"
+```
+
+Provide servers via environment variables (codes contain a token — treat like passwords):
+
+- `RDDIAG_CODE` — a single default connection code (`rddiag:v1:...`)
+- `RDDIAG_SERVERS` — JSON map of name → code, e.g. `{"berlin":"rddiag:v1:...","fra":"rddiag:v1:..."}`
+
+Without env config, every tool simply takes a `code` argument.
+
+## Tools
+
+`rd_servers`, `rd_ping`, `rd_diagnostics`, `rd_status`, `rd_items`, `rd_packages`, `rd_errors`, `rd_logs`
+(`main|audit|rename|trace|session|conversion|package|item`), `rd_history`, `rd_accounts`, `rd_providers`
+(live per-account/key cooldown + in-flight + rotation state), `rd_host`, `rd_self_check`,
+`rd_get` (raw escape-hatch, any read-only path).
+
+Each tool accepts `code` or `server` to pick the target.
+
+## Connection code
+
+Format: `rddiag:v1:<base64url(JSON)>` with `{ v:1, h:host, p:port, t:token, n?:name, fp?:certFingerprint, s?:scheme }`.
+Generated by the app (Hilfe → Remote-Support → Ferndiagnose (MCP)) or via `node src/gen-code.mjs --host H --port P --token T`.
+
+## Security model (read before exposing a server)
+
+- The debug surface is **read-only** for state/logs; the one control endpoint is `/trace/config` (toggles the
+  optional, time-bounded support trace). No persistent secrets are written into the logs it serves: passwords are
+  redacted, debrid API keys/tokens and resolved download URLs are never logged; `/settings` and `/accounts` are redacted.
+- Auth is a bearer token (24 random bytes). Over plain HTTP on a public network the token is sniffable, so:
+  - **Preferred:** keep the server bound to `127.0.0.1` ("Nur lokal") and reach it through a private tunnel
+    (Tailscale / SSH / Cloudflare Tunnel). The tunnel encrypts and authenticates; no public exposure.
+  - **Direct network bind (`0.0.0.0`)** requires a non-empty **IP allowlist** (enforced fail-closed: with an empty
+    allowlist only loopback is accepted). Use only inside a trusted LAN/VPN.
+- Revoke instantly from the app ("Token neu" or "Deaktivieren") — the old code stops working immediately.
+- `fp` pins a self-signed cert fingerprint and is verified on `secureConnect` (before the token is sent). HTTPS is
+  not the v1 default; plain HTTP behind a tunnel is the recommended transport.
+
+## Test
+
+```bash
+npm test    # spins a fake debug-server, runs the bridge as a stdio child, asserts the full protocol path
+```

tools/rd-diagnostics-mcp/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "rd-diagnostics-mcp",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Standalone stdio MCP bridge to the Real-Debrid-Downloader debug-server. Connects via connection code, proxies the read-only HTTP diagnostics API as MCP tools.",
+  "type": "module",
+  "bin": {
+    "rd-diagnostics-mcp": "src/bridge.mjs"
+  },
+  "scripts": {
+    "start": "node src/bridge.mjs",
+    "test": "node test/harness.mjs"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.12.0",
+    "zod": "^3.23.8"
+  }
+}

tools/rd-diagnostics-mcp/src/bridge.mjs

@@ -0,0 +1,332 @@
+#!/usr/bin/env node
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { z } from "zod";
+import { decodeConnectionCode } from "./code.mjs";
+import { debugGet } from "./http.mjs";
+
+function loadServerMap() {
+  const map = new Map();
+  const raw = process.env.RDDIAG_SERVERS;
+  if (raw) {
+    try {
+      const parsed = JSON.parse(raw);
+      for (const [name, code] of Object.entries(parsed || {})) {
+        map.set(String(name), String(code));
+      }
+    } catch {
+      process.stderr.write("rd-diagnostics-mcp: RDDIAG_SERVERS ist kein gueltiges JSON, wird ignoriert\n");
+    }
+  }
+  return map;
+}
+
+const SERVER_MAP = loadServerMap();
+const DEFAULT_CODE = process.env.RDDIAG_CODE ? String(process.env.RDDIAG_CODE) : "";
+
+function listAvailableServers() {
+  const names = [...SERVER_MAP.keys()];
+  if (DEFAULT_CODE) names.push("(RDDIAG_CODE-Default)");
+  return names;
+}
+
+function resolveTarget(args) {
+  let code = "";
+  if (args && args.code) {
+    code = String(args.code);
+  } else if (args && args.server) {
+    const found = SERVER_MAP.get(String(args.server));
+    if (!found) {
+      throw new Error(
+        `Server "${args.server}" nicht konfiguriert. Bekannt: ${listAvailableServers().join(", ") || "(keine)"}`
+      );
+    }
+    code = found;
+  } else if (DEFAULT_CODE) {
+    code = DEFAULT_CODE;
+  } else if (SERVER_MAP.size === 1) {
+    code = [...SERVER_MAP.values()][0];
+  } else {
+    throw new Error(
+      `Kein Verbindungscode. Uebergib "code" oder "server", oder setze RDDIAG_CODE/RDDIAG_SERVERS. Bekannt: ${listAvailableServers().join(", ") || "(keine)"}`
+    );
+  }
+  return decodeConnectionCode(code);
+}
+
+function targetLabel(target) {
+  return target.name ? `${target.name} (${target.host}:${target.port})` : `${target.host}:${target.port}`;
+}
+
+function buildQuery(params) {
+  const usable = Object.entries(params || {}).filter(
+    ([, v]) => v !== undefined && v !== null && String(v).length > 0
+  );
+  if (usable.length === 0) return "";
+  const sp = new URLSearchParams();
+  for (const [k, v] of usable) sp.set(k, String(v));
+  return "?" + sp.toString();
+}
+
+function prettyBody(body) {
+  try {
+    return JSON.stringify(JSON.parse(body), null, 2);
+  } catch {
+    return body;
+  }
+}
+
+function connectionHint(err) {
+  const m = String((err && err.code) || err && err.message || "");
+  if (/ECONNREFUSED/.test(m)) return "Debug-Server nicht erreichbar — auf dem Server aktiviert? Port/Firewall offen?";
+  if (/ENOTFOUND|EAI_AGAIN/.test(m)) return "Host nicht aufloesbar — stimmt die Adresse im Verbindungscode?";
+  if (/ETIMEDOUT|Zeitueberschreitung/.test(m)) return "Zeitueberschreitung — Server/Netz langsam oder Port geblockt.";
+  if (/ECONNRESET|EPIPE/.test(m)) return "Verbindung abgebrochen — falscher Port/Scheme (http vs https)?";
+  if (/Fingerprint/.test(m)) return "TLS-Fingerprint passt nicht — Code stammt evtl. von einem anderen Server.";
+  return "";
+}
+
+async function requestTool(args, path, params, opts = {}) {
+  let target;
+  try {
+    target = resolveTarget(args);
+  } catch (err) {
+    return { content: [{ type: "text", text: `# Verbindungsfehler\n${err.message}` }], isError: true };
+  }
+  const fullPath = path + buildQuery(params);
+  const label = targetLabel(target);
+  try {
+    const res = await debugGet(target, fullPath, { timeoutMs: opts.timeoutMs || 20000 });
+    const isError = res.status < 200 || res.status >= 300;
+    let extra = "";
+    if (res.status === 401) extra = "\n(401 = Token im Verbindungscode ist abgelaufen/rotiert. Neuen Code anfordern.)";
+    if (res.status === 503) extra = "\n(503 = Download-Manager nicht bereit. App laeuft, aber noch nicht initialisiert?)";
+    const head = `# ${label} ${fullPath} → HTTP ${res.status}${extra}`;
+    return { content: [{ type: "text", text: head + "\n" + prettyBody(res.body) }], isError };
+  } catch (err) {
+    const hint = connectionHint(err);
+    const text = `# ${label} ${fullPath} → FEHLER\n${err.message}${hint ? "\n→ " + hint : ""}`;
+    return { content: [{ type: "text", text }], isError: true };
+  }
+}
+
+const CODE_FIELD = {
+  code: z.string().optional().describe("Verbindungscode (rddiag:v1:...). Optional, wenn server/RDDIAG_CODE gesetzt ist."),
+  server: z.string().optional().describe("Name eines via RDDIAG_SERVERS konfigurierten Servers statt eines vollen Codes.")
+};
+
+const server = new McpServer({ name: "rd-diagnostics-mcp", version: "1.0.0" });
+
+server.registerTool(
+  "rd_servers",
+  {
+    title: "Konfigurierte Server",
+    description: "Listet die in dieser Bridge konfigurierten Server (RDDIAG_SERVERS / RDDIAG_CODE). Verbindet sich nicht.",
+    inputSchema: {}
+  },
+  async () => {
+    const names = [...SERVER_MAP.keys()];
+    const lines = [];
+    lines.push(`Konfigurierte Server: ${names.length}`);
+    for (const n of names) lines.push(`- ${n}`);
+    lines.push(`Default (RDDIAG_CODE): ${DEFAULT_CODE ? "gesetzt" : "nicht gesetzt"}`);
+    lines.push("");
+    lines.push("Tools akzeptieren entweder code:<rddiag:v1:...> oder server:<name>.");
+    return { content: [{ type: "text", text: lines.join("\n") }] };
+  }
+);
+
+server.registerTool(
+  "rd_ping",
+  {
+    title: "Erreichbarkeit pruefen",
+    description: "Schneller Health-Check (GET /health): App-Version, Uptime, Speicher. Zuerst aufrufen, um Erreichbarkeit + Token zu pruefen.",
+    inputSchema: { ...CODE_FIELD }
+  },
+  async (args) => requestTool(args, "/health", {}, { timeoutMs: 10000 })
+);
+
+server.registerTool(
+  "rd_diagnostics",
+  {
+    title: "Gesamtdiagnose",
+    description: "Aggregierter Zustand (GET /diagnostics): Meta, Status, Settings, Stats, Accounts, History, Host + die wichtigsten Logs. Der 'alles auf einen Blick'-Endpunkt.",
+    inputSchema: {
+      ...CODE_FIELD,
+      lines: z.number().int().positive().optional().describe("Anzahl Log-Zeilen pro Log (Default 150)."),
+      grep: z.string().optional().describe("Filter fuer Log-Zeilen."),
+      package: z.string().optional().describe("Optional auf ein Paket fokussieren.")
+    }
+  },
+  async (args) => requestTool(args, "/diagnostics", { lines: args.lines, grep: args.grep, package: args.package }, { timeoutMs: 30000 })
+);
+
+server.registerTool(
+  "rd_status",
+  {
+    title: "Live-Status",
+    description: "Laufzeit-Status (GET /status): aktive Downloads, Queue, Provider-Zustand.",
+    inputSchema: { ...CODE_FIELD }
+  },
+  async (args) => requestTool(args, "/status", {})
+);
+
+server.registerTool(
+  "rd_items",
+  {
+    title: "Download-Items",
+    description: "Einzelne Download-Items (GET /items), optional gefiltert nach Status/Paket.",
+    inputSchema: {
+      ...CODE_FIELD,
+      status: z.string().optional().describe("Status-Filter (z.B. downloading, error, done)."),
+      package: z.string().optional().describe("Paket-Filter.")
+    }
+  },
+  async (args) => requestTool(args, "/items", { status: args.status, package: args.package })
+);
+
+server.registerTool(
+  "rd_packages",
+  {
+    title: "Pakete",
+    description: "Pakete (GET /packages), optional mit enthaltenen Items.",
+    inputSchema: {
+      ...CODE_FIELD,
+      package: z.string().optional().describe("Bestimmtes Paket."),
+      includeItems: z.boolean().optional().describe("Items mitliefern.")
+    }
+  },
+  async (args) => requestTool(args, "/packages", { package: args.package, includeItems: args.includeItems ? "1" : "" })
+);
+
+server.registerTool(
+  "rd_errors",
+  {
+    title: "Letzte Fehler",
+    description: "Fehler-Ring (GET /errors): die letzten Fehler mit Level/Quelle. 'Was ist schiefgelaufen'.",
+    inputSchema: {
+      ...CODE_FIELD,
+      level: z.string().optional().describe("Level-Filter (ERROR, WARN, ...)."),
+      limit: z.number().int().positive().optional().describe("Anzahl (Default 100).")
+    }
+  },
+  async (args) => requestTool(args, "/errors", { level: args.level, limit: args.limit })
+);
+
+const LOG_PATHS = {
+  main: "/logs/main",
+  audit: "/logs/audit",
+  rename: "/logs/rename",
+  trace: "/logs/trace",
+  session: "/logs/session",
+  conversion: "/logs/conversion",
+  package: "/logs/package",
+  item: "/logs/item"
+};
+
+server.registerTool(
+  "rd_logs",
+  {
+    title: "Log lesen",
+    description: "Liest das Ende eines Logs (GET /logs/<name>). name: main|audit|rename|trace|session|conversion|package|item. conversion = Pro-Item Link-Aufloesungs-Lebenszyklus (Token, API, Web, Rotation, Abbrueche mit Zeiten). Fuer package/item zusaetzlich package/item angeben.",
+    inputSchema: {
+      ...CODE_FIELD,
+      name: z.enum(["main", "audit", "rename", "trace", "session", "conversion", "package", "item"]).describe("Welches Log."),
+      lines: z.number().int().positive().optional().describe("Anzahl Zeilen vom Ende (Default 100)."),
+      grep: z.string().optional().describe("Filter."),
+      package: z.string().optional().describe("Nur fuer name=package."),
+      item: z.string().optional().describe("Nur fuer name=item.")
+    }
+  },
+  async (args) => {
+    const path = LOG_PATHS[args.name];
+    return requestTool(args, path, { lines: args.lines, grep: args.grep, package: args.package, item: args.item });
+  }
+);
+
+server.registerTool(
+  "rd_history",
+  {
+    title: "Verlauf",
+    description: "Abgeschlossener Verlauf (GET /history), optional nach Status/Suchbegriff.",
+    inputSchema: {
+      ...CODE_FIELD,
+      limit: z.number().int().positive().optional().describe("Anzahl (Default 50)."),
+      status: z.string().optional().describe("Status-Filter."),
+      grep: z.string().optional().describe("Suchbegriff.")
+    }
+  },
+  async (args) => requestTool(args, "/history", { limit: args.limit, status: args.status, grep: args.grep })
+);
+
+server.registerTool(
+  "rd_accounts",
+  {
+    title: "Accounts",
+    description: "Debrid-Accounts (GET /accounts, Token redigiert): Gueltigkeit, Premium, Cooldown/Rotation.",
+    inputSchema: { ...CODE_FIELD }
+  },
+  async (args) => requestTool(args, "/accounts", {})
+);
+
+server.registerTool(
+  "rd_providers",
+  {
+    title: "Provider-Laufzeitzustand",
+    description: "Live Provider-Runtime (GET /providers): pro Mega-Account/Debrid-Link-Key der AKTIVE Cooldown (until/remainingMs/Grund/Kategorie), in-flight-Tiefe, Mega-Rotationscursor, Empty-Response-Streaks. Die 'warum kuehlt es JETZT ab'-Ansicht — beantwortet Cooldown-Fragen direkt statt aus Log-Arithmetik.",
+    inputSchema: { ...CODE_FIELD }
+  },
+  async (args) => requestTool(args, "/providers", {})
+);
+
+server.registerTool(
+  "rd_host",
+  {
+    title: "Host-Diagnose",
+    description: "Windows-Host-Diagnose (GET /host/diagnostics): Laufwerke, Speicher, Pfade.",
+    inputSchema: { ...CODE_FIELD }
+  },
+  async (args) => requestTool(args, "/host/diagnostics", {})
+);
+
+server.registerTool(
+  "rd_self_check",
+  {
+    title: "Self-Check",
+    description: "Setup/Self-Check (GET /self-check): erkennt Konfigurations-/Pfadprobleme.",
+    inputSchema: { ...CODE_FIELD }
+  },
+  async (args) => requestTool(args, "/self-check", {})
+);
+
+server.registerTool(
+  "rd_get",
+  {
+    title: "Roh-Endpunkt (Escape-Hatch)",
+    description: "Beliebigen Debug-Server-Pfad lesen (GET <path>), wenn kein spezialisiertes Tool passt. Pfad inkl. fuehrendem / und optionalem Query-String, z.B. /meta oder /stats.",
+    inputSchema: {
+      ...CODE_FIELD,
+      path: z.string().describe("Pfad mit fuehrendem /, optional ?query. Nur GET, read-only.")
+    }
+  },
+  async (args) => {
+    const p = String(args.path || "");
+    if (!p.startsWith("/")) {
+      return { content: [{ type: "text", text: "# Fehler\npath muss mit / beginnen" }], isError: true };
+    }
+    return requestTool(args, p, {}, { timeoutMs: 30000 });
+  }
+);
+
+async function main() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  process.stderr.write(
+    `rd-diagnostics-mcp bereit. Server: ${listAvailableServers().join(", ") || "(keine vorkonfiguriert; code pro Aufruf uebergeben)"}\n`
+  );
+}
+
+main().catch((err) => {
+  process.stderr.write(`rd-diagnostics-mcp Startfehler: ${err && err.stack ? err.stack : err}\n`);
+  process.exit(1);
+});

tools/rd-diagnostics-mcp/src/code.d.mts

@@ -0,0 +1,20 @@
+export interface DecodedConnectionCode {
+  host: string;
+  port: number;
+  token: string;
+  scheme: string;
+  name: string;
+  fingerprint: string;
+}
+
+export interface EncodeConnectionCodeInput {
+  host: string;
+  port: number;
+  token: string;
+  name?: string;
+  fingerprint?: string;
+  scheme?: string;
+}
+
+export function encodeConnectionCode(input: EncodeConnectionCodeInput): string;
+export function decodeConnectionCode(code: string): DecodedConnectionCode;

tools/rd-diagnostics-mcp/src/code.mjs

@@ -0,0 +1,56 @@
+const PREFIX = "rddiag:v1:";
+
+function base64urlEncode(str) {
+  return Buffer.from(str, "utf8")
+    .toString("base64")
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_")
+    .replace(/=+$/, "");
+}
+
+function base64urlDecode(str) {
+  const pad = str.length % 4 === 0 ? "" : "=".repeat(4 - (str.length % 4));
+  const b64 = str.replace(/-/g, "+").replace(/_/g, "/") + pad;
+  return Buffer.from(b64, "base64").toString("utf8");
+}
+
+export function encodeConnectionCode({ host, port, token, name, fingerprint, scheme }) {
+  if (!host || typeof host !== "string") throw new Error("host fehlt");
+  const p = Number(port);
+  if (!Number.isInteger(p) || p < 1 || p > 65535) throw new Error("port ungueltig");
+  if (!token || typeof token !== "string") throw new Error("token fehlt");
+  const payload = { v: 1, h: host, p, t: token };
+  if (name) payload.n = String(name);
+  if (fingerprint) payload.fp = String(fingerprint);
+  if (scheme && scheme !== "http") payload.s = String(scheme);
+  return PREFIX + base64urlEncode(JSON.stringify(payload));
+}
+
+export function decodeConnectionCode(code) {
+  const raw = String(code || "").trim();
+  if (!raw.startsWith(PREFIX)) {
+    throw new Error(`Verbindungscode muss mit "${PREFIX}" beginnen`);
+  }
+  let json;
+  try {
+    json = JSON.parse(base64urlDecode(raw.slice(PREFIX.length)));
+  } catch {
+    throw new Error("Verbindungscode ist beschaedigt (kein gueltiges base64url/JSON)");
+  }
+  if (!json || typeof json !== "object") throw new Error("Verbindungscode-Inhalt ungueltig");
+  const host = String(json.h || "").trim();
+  const port = Number(json.p);
+  const token = String(json.t || "");
+  if (!host) throw new Error("Verbindungscode ohne Host");
+  if (!Number.isInteger(port) || port < 1 || port > 65535) throw new Error("Verbindungscode mit ungueltigem Port");
+  if (!token) throw new Error("Verbindungscode ohne Token");
+  const scheme = json.s === "https" ? "https" : "http";
+  return {
+    host,
+    port,
+    token,
+    scheme,
+    name: json.n ? String(json.n) : "",
+    fingerprint: json.fp ? String(json.fp) : ""
+  };
+}

tools/rd-diagnostics-mcp/src/gen-code.mjs

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+import { encodeConnectionCode } from "./code.mjs";
+
+function arg(name, fallback) {
+  const i = process.argv.indexOf("--" + name);
+  if (i >= 0 && i + 1 < process.argv.length) return process.argv[i + 1];
+  return fallback;
+}
+
+const host = arg("host");
+const port = arg("port");
+const token = arg("token");
+const name = arg("name");
+const scheme = arg("scheme");
+const fingerprint = arg("fp");
+
+if (!host || !port || !token) {
+  process.stderr.write("Usage: node src/gen-code.mjs --host <h> --port <p> --token <t> [--name <n>] [--scheme https] [--fp <sha256>]\n");
+  process.exit(2);
+}
+
+process.stdout.write(encodeConnectionCode({ host, port, token, name, scheme, fingerprint }) + "\n");

tools/rd-diagnostics-mcp/src/http.mjs

@@ -0,0 +1,63 @@
+import http from "node:http";
+import https from "node:https";
+
+function normalizeFp(fp) {
+  return String(fp || "").replace(/:/g, "").toLowerCase();
+}
+
+export function debugGet(target, path, { timeoutMs = 20000 } = {}) {
+  const scheme = target.scheme === "https" ? "https" : "http";
+  const lib = scheme === "https" ? https : http;
+  const rel = path.startsWith("/") ? path : "/" + path;
+  const url = new URL(rel, `${scheme}://${target.host}:${target.port}`);
+  const pinning = scheme === "https" && !!target.fingerprint;
+
+  return new Promise((resolve, reject) => {
+    const options = {
+      method: "GET",
+      headers: {
+        Authorization: `Bearer ${target.token}`,
+        Accept: "application/json"
+      },
+      timeout: timeoutMs
+    };
+    if (scheme === "https") {
+      options.rejectUnauthorized = !target.fingerprint;
+    }
+
+    const req = lib.request(url, options, (res) => {
+      let data = "";
+      res.setEncoding("utf8");
+      res.on("data", (chunk) => {
+        data += chunk;
+      });
+      res.on("end", () => {
+        resolve({ status: res.statusCode || 0, body: data, headers: res.headers });
+      });
+    });
+
+    req.on("timeout", () => {
+      req.destroy(new Error(`Zeitueberschreitung nach ${timeoutMs}ms`));
+    });
+    req.on("error", (err) => {
+      reject(err);
+    });
+
+    if (pinning) {
+      req.on("socket", (socket) => {
+        socket.on("secureConnect", () => {
+          const cert = typeof socket.getPeerCertificate === "function" ? socket.getPeerCertificate() : null;
+          const got = normalizeFp(cert && cert.fingerprint256);
+          const want = normalizeFp(target.fingerprint);
+          if (!got || got !== want) {
+            req.destroy(new Error(`TLS-Fingerprint stimmt nicht (erwartet ${want || "?"}, erhalten ${got || "?"})`));
+            return;
+          }
+          req.end();
+        });
+      });
+    } else {
+      req.end();
+    }
+  });
+}

tools/rd-diagnostics-mcp/test/harness.mjs

@@ -0,0 +1,175 @@
+import http from "node:http";
+import { spawn } from "node:child_process";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+import { encodeConnectionCode } from "../src/code.mjs";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const BRIDGE = join(__dirname, "..", "src", "bridge.mjs");
+const TOKEN = "test-token-abc123";
+
+const failures = [];
+function check(name, cond, detail) {
+  if (cond) {
+    process.stdout.write(`  PASS ${name}\n`);
+  } else {
+    failures.push(name);
+    process.stdout.write(`  FAIL ${name}${detail ? " — " + detail : ""}\n`);
+  }
+}
+
+function startFakeServer() {
+  return new Promise((resolve) => {
+    const server = http.createServer((req, res) => {
+      const url = new URL(req.url, "http://localhost");
+      const auth = req.headers.authorization || "";
+      const tokenOk = auth === `Bearer ${TOKEN}` || url.searchParams.get("token") === TOKEN;
+      if (!tokenOk) {
+        res.writeHead(401, { "content-type": "application/json" });
+        res.end(JSON.stringify({ error: "Unauthorized" }));
+        return;
+      }
+      const p = url.pathname;
+      const q = Object.fromEntries(url.searchParams.entries());
+      const send = (obj) => {
+        res.writeHead(200, { "content-type": "application/json" });
+        res.end(JSON.stringify(obj));
+      };
+      if (p === "/health") return send({ status: "ok", appVersion: "1.7.222", uptime: 42 });
+      if (p === "/diagnostics") return send({ meta: { appVersion: "1.7.222" }, status: { active: 1 }, query: q });
+      if (p === "/errors") return send({ errors: [{ level: "ERROR", message: "boom" }], query: q });
+      if (p === "/logs/main") return send({ lines: ["line1", "line2"], count: 2, query: q });
+      if (p === "/status") return send({ active: 1, queued: 3 });
+      if (p === "/items") return send({ items: [], query: q });
+      if (p === "/accounts") return send({ accounts: [{ name: "acc1", premium: true }] });
+      if (p === "/meta") return send({ appVersion: "1.7.222", endpoints: ["/health", "/diagnostics"] });
+      res.writeHead(404, { "content-type": "application/json" });
+      res.end(JSON.stringify({ error: "not found", path: p }));
+    });
+    server.listen(0, "127.0.0.1", () => resolve(server));
+  });
+}
+
+function startBridge() {
+  const child = spawn(process.execPath, [BRIDGE], { stdio: ["pipe", "pipe", "pipe"] });
+  child.stderr.on("data", (d) => process.stderr.write(`[bridge] ${d}`));
+  const pending = new Map();
+  let buf = "";
+  child.stdout.on("data", (chunk) => {
+    buf += chunk.toString("utf8");
+    let idx;
+    while ((idx = buf.indexOf("\n")) >= 0) {
+      const line = buf.slice(0, idx).trim();
+      buf = buf.slice(idx + 1);
+      if (!line) continue;
+      let msg;
+      try {
+        msg = JSON.parse(line);
+      } catch {
+        continue;
+      }
+      if (msg.id !== undefined && pending.has(msg.id)) {
+        pending.get(msg.id)(msg);
+        pending.delete(msg.id);
+      }
+    }
+  });
+  let nextId = 1;
+  function rpc(method, params) {
+    const id = nextId++;
+    return new Promise((resolve, reject) => {
+      pending.set(id, resolve);
+      child.stdin.write(JSON.stringify({ jsonrpc: "2.0", id, method, params }) + "\n");
+      setTimeout(() => {
+        if (pending.has(id)) {
+          pending.delete(id);
+          reject(new Error(`RPC timeout: ${method}`));
+        }
+      }, 15000);
+    });
+  }
+  function notify(method, params) {
+    child.stdin.write(JSON.stringify({ jsonrpc: "2.0", method, params }) + "\n");
+  }
+  return { child, rpc, notify };
+}
+
+function textOf(callResult) {
+  const c = callResult && callResult.result && callResult.result.content;
+  if (!Array.isArray(c)) return "";
+  return c.map((x) => x.text || "").join("\n");
+}
+
+async function run() {
+  const fake = await startFakeServer();
+  const port = fake.address().port;
+  const code = encodeConnectionCode({ host: "127.0.0.1", port, token: TOKEN, name: "testserver" });
+  const badCode = encodeConnectionCode({ host: "127.0.0.1", port, token: "WRONG", name: "testserver" });
+
+  const bridge = startBridge();
+  try {
+    const init = await bridge.rpc("initialize", {
+      protocolVersion: "2024-11-05",
+      capabilities: {},
+      clientInfo: { name: "harness", version: "1.0.0" }
+    });
+    check("initialize handshake", !!(init.result && init.result.serverInfo), JSON.stringify(init.error || {}));
+    check("server name reported", init.result && init.result.serverInfo && init.result.serverInfo.name === "rd-diagnostics-mcp");
+    bridge.notify("notifications/initialized", {});
+
+    const tools = await bridge.rpc("tools/list", {});
+    const names = (tools.result && tools.result.tools || []).map((t) => t.name);
+    check("tools/list returns tools", names.length >= 10, `got ${names.length}`);
+    for (const expected of ["rd_ping", "rd_diagnostics", "rd_errors", "rd_logs", "rd_get", "rd_servers"]) {
+      check(`tool present: ${expected}`, names.includes(expected));
+    }
+
+    const ping = await bridge.rpc("tools/call", { name: "rd_ping", arguments: { code } });
+    const pingText = textOf(ping);
+    check("rd_ping reaches server", /HTTP 200/.test(pingText) && /"status": "ok"/.test(pingText), pingText.slice(0, 200));
+    check("rd_ping shows server label", /testserver \(127\.0\.0\.1:/.test(pingText));
+
+    const diag = await bridge.rpc("tools/call", { name: "rd_diagnostics", arguments: { code, lines: 50, grep: "err" } });
+    const diagText = textOf(diag);
+    check("rd_diagnostics returns aggregate", /"appVersion": "1\.7\.222"/.test(diagText));
+    check("rd_diagnostics passes query params", /"lines": "50"/.test(diagText) && /"grep": "err"/.test(diagText), diagText.slice(0, 300));
+
+    const logs = await bridge.rpc("tools/call", { name: "rd_logs", arguments: { code, name: "main", lines: 5 } });
+    const logsText = textOf(logs);
+    check("rd_logs maps name→path + lines", /logs\/main\?lines=5/.test(logsText) && /"count": 2/.test(logsText), logsText.slice(0, 200));
+
+    const errs = await bridge.rpc("tools/call", { name: "rd_errors", arguments: { code, level: "ERROR" } });
+    check("rd_errors returns ring", /"message": "boom"/.test(textOf(errs)));
+
+    const raw = await bridge.rpc("tools/call", { name: "rd_get", arguments: { code, path: "/meta" } });
+    check("rd_get escape hatch hits arbitrary path", /"endpoints"/.test(textOf(raw)));
+
+    const unauthorized = await bridge.rpc("tools/call", { name: "rd_ping", arguments: { code: badCode } });
+    check("bad token → HTTP 401 + isError", /HTTP 401/.test(textOf(unauthorized)) && unauthorized.result.isError === true);
+
+    const noCode = await bridge.rpc("tools/call", { name: "rd_ping", arguments: {} });
+    check("missing code → graceful isError", noCode.result && noCode.result.isError === true && /Kein Verbindungscode/.test(textOf(noCode)));
+
+    const unreachable = await bridge.rpc("tools/call", {
+      name: "rd_ping",
+      arguments: { code: encodeConnectionCode({ host: "127.0.0.1", port: 1, token: TOKEN }) }
+    });
+    check("unreachable → isError + hint", unreachable.result.isError === true && /nicht erreichbar|abgebrochen|FEHLER/.test(textOf(unreachable)), textOf(unreachable).slice(0, 160));
+  } finally {
+    bridge.child.kill();
+    fake.close();
+  }
+
+  process.stdout.write("\n");
+  if (failures.length) {
+    process.stdout.write(`RESULT: ${failures.length} FAIL\n`);
+    process.exit(1);
+  }
+  process.stdout.write("RESULT: ALL PASS\n");
+  process.exit(0);
+}
+
+run().catch((err) => {
+  process.stderr.write(`harness error: ${err && err.stack ? err.stack : err}\n`);
+  process.exit(1);
+});