Add dedicated rename support logging

README.md

@@ -207,6 +207,7 @@ Runtime files are stored in Electron's `userData` directory, including:
 - `rd_history.json`
 - `rd_downloader.log`
 - `audit.log`
+- `rename.log`
 - `debug_ai_manifest.json`
 - `trace.log`
 - `trace_config.json`
@@ -214,7 +215,7 @@ Runtime files are stored in Electron's `userData` directory, including:
 - `package-logs/package_*.txt`
 - `item-logs/item_*.txt`
 
-`audit.log` and `trace.log` are rotated automatically. The current file is kept plus one `.old` backup, and outdated backups are purged automatically.
+`audit.log`, `rename.log`, and `trace.log` are rotated automatically. The current file is kept plus one `.old` backup, and outdated backups are purged automatically.
 
 ### Remote debug server
 
@@ -253,6 +254,7 @@ Available endpoints after restart:
 - `GET /log?lines=100&grep=keyword`
 - `GET /logs/main?lines=100&grep=keyword`
 - `GET /logs/audit?lines=100&grep=keyword`
+- `GET /logs/rename?lines=100&grep=keyword`
 - `GET /logs/trace?lines=100&grep=keyword`
 - `GET /logs/session?lines=100&grep=keyword`
 - `GET /logs/package?package=Release&lines=100&grep=keyword`
@@ -277,6 +279,7 @@ Invoke-RestMethod "http://SERVER:9868/history?token=YOUR_TOKEN&limit=20"
 Invoke-RestMethod "http://SERVER:9868/debug/setup?token=YOUR_TOKEN"
 Invoke-RestMethod "http://SERVER:9868/self-check?token=YOUR_TOKEN"
 Invoke-RestMethod "http://SERVER:9868/logs/audit?token=YOUR_TOKEN&lines=200"
+Invoke-RestMethod "http://SERVER:9868/logs/rename?token=YOUR_TOKEN&lines=200"
 Invoke-RestMethod "http://SERVER:9868/logs/trace?token=YOUR_TOKEN&lines=200"
 Invoke-RestMethod "http://SERVER:9868/trace/config?token=YOUR_TOKEN&enable=1&note=support&durationMinutes=120"
 Invoke-RestMethod "http://SERVER:9868/logs/package?token=YOUR_TOKEN&package=Release&lines=200"
@@ -285,7 +288,7 @@ Invoke-RestMethod "http://SERVER:9868/host/diagnostics?token=YOUR_TOKEN"
 Invoke-WebRequest "http://SERVER:9868/support/bundle?token=YOUR_TOKEN" -OutFile ".\\rd-support-bundle.zip"
 ```
 
-This makes it easy to share one URL plus token during support, so current package status, session state, history, redacted account/settings state, audit actions, trace data, package/session/item logs, host-side Windows crash hints, disk space, support-log volume, support-bundle size estimates, and even a full ZIP support bundle can be inspected remotely.
+This makes it easy to share one URL plus token during support, so current package status, session state, history, redacted account/settings state, audit actions, rename/MKV move traces, trace data, package/session/item logs, host-side Windows crash hints, disk space, support-log volume, support-bundle size estimates, and even a full ZIP support bundle can be inspected remotely.
 
 ## Troubleshooting
 

src/main/app-controller.ts

@@ -39,6 +39,7 @@ import { encryptBackup, decryptBackup } from "./backup-crypto";
 import { getAuditLogPath, initAuditLog, logAuditEvent, shutdownAuditLog } from "./audit-log";
 import { getDebugSetupCheck } from "./debug-setup";
 import { buildLinkExportSelection, serializeLinkExportText } from "./link-export";
+import { getRenameLogPath, initRenameLog, shutdownRenameLog } from "./rename-log";
 import { buildAccountSummary, diffAccountSummary } from "./support-data";
 import { buildSupportBundle, getSupportBundleDefaultFileName } from "./support-bundle";
 import { getTraceConfig, getTraceLogPath, initTraceLog, logTraceEvent, setTraceEnabled, shutdownTraceLog } from "./trace-log";
@@ -82,6 +83,7 @@ export class AppController {
     initPackageLogs(this.storagePaths.baseDir);
     initItemLogs(this.storagePaths.baseDir);
     initAuditLog(this.storagePaths.baseDir);
+    initRenameLog(this.storagePaths.baseDir);
     initTraceLog(this.storagePaths.baseDir);
     this.settings = loadSettings(this.storagePaths);
     const session = loadSession(this.storagePaths);
@@ -186,6 +188,10 @@ export class AppController {
     return getAuditLogPath();
   }
 
+  public getRenameLogPath(): string | null {
+    return getRenameLogPath();
+  }
+
   public getTraceLogPath(): string | null {
     return getTraceLogPath();
   }
@@ -643,6 +649,7 @@ export class AppController {
     shutdownSessionLog();
     shutdownPackageLogs();
     shutdownItemLogs();
+    shutdownRenameLog();
     this.audit("INFO", "App beendet");
     shutdownTraceLog();
     shutdownAuditLog();

src/main/debug-server.ts

@@ -9,6 +9,7 @@ import { logger, getLogFilePath } from "./logger";
 import { getItemLogPath as getPersistedItemLogPath } from "./item-log";
 import { getSessionLogPath } from "./session-log";
 import { getPackageLogPath as getPersistedPackageLogPath } from "./package-log";
+import { getRenameLogPath } from "./rename-log";
 import { createStoragePaths, loadHistory, loadSettings } from "./storage";
 import { buildAccountSummary, buildRedactedSettingsPayload, buildStatsPayload, summarizeHistoryEntry } from "./support-data";
 import { buildSupportBundle, getSupportBundleDefaultFileName } from "./support-bundle";
@@ -38,6 +39,7 @@ const DEBUG_ENDPOINTS: DebugEndpointDescriptor[] = [
   { method: "GET", path: "/log", queryExample: "lines=100&grep=keyword", description: "Legacy alias for the main application log tail." },
   { method: "GET", path: "/logs/main", queryExample: "lines=100&grep=keyword", description: "Reads the main application log tail." },
   { method: "GET", path: "/logs/audit", queryExample: "lines=100&grep=keyword", description: "Reads the audit log for support-relevant UI and admin actions." },
+  { 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/package", queryExample: "package=Release&lines=100&grep=keyword", description: "Reads the package log for a specific package name or id." },
@@ -240,7 +242,7 @@ function buildAiManifest(baseDir: string): Record<string, unknown> {
       "If remote access is needed, ask the user only for the server IP or DNS name.",
       "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, /status, /packages, /items, /settings, /accounts, /stats, /history, or /logs/trace.",
+      "Use /diagnostics for an overview, then drill into /logs/item, /logs/package, /logs/rename, /status, /packages, /items, /settings, /accounts, /stats, /history, or /logs/trace.",
       "If a full handoff is needed, download /support/bundle as a ZIP."
     ],
     auth: {
@@ -257,6 +259,7 @@ function buildAiManifest(baseDir: string): Record<string, unknown> {
       tokenFile: path.join(baseDir, "debug_token.txt"),
       mainLogFile: getLogFilePath(),
       auditLogFile: getAuditLogPath(),
+      renameLogFile: getRenameLogPath(),
       traceLogFile: getTraceLogPath(),
       traceConfigFile: getTraceConfigPath(),
       sessionLogFile: getSessionLogPath(),
@@ -483,6 +486,7 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
       logPaths: {
         main: getLogFilePath(),
         audit: getAuditLogPath(),
+        rename: getRenameLogPath(),
         session: getSessionLogPath(),
         trace: getTraceLogPath()
       },
@@ -522,6 +526,19 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
     return;
   }
 
+  if (pathname === "/logs/rename") {
+    const count = normalizeLinesParam(url.searchParams.get("lines"), 100);
+    const grep = url.searchParams.get("grep") || "";
+    const logPath = getRenameLogPath();
+    const lines = filterLines(readLogTailFromFile(logPath, count), grep);
+    jsonResponse(res, 200, {
+      path: logPath,
+      lines,
+      count: lines.length
+    });
+    return;
+  }
+
   if (pathname === "/logs/trace") {
     const count = normalizeLinesParam(url.searchParams.get("lines"), 100);
     const grep = url.searchParams.get("grep") || "";
@@ -847,6 +864,10 @@ function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): voi
           path: getAuditLogPath(),
           lines: filterLines(readLogTailFromFile(getAuditLogPath(), lineCount), grep)
         },
+        rename: {
+          path: getRenameLogPath(),
+          lines: filterLines(readLogTailFromFile(getRenameLogPath(), lineCount), grep)
+        },
         trace: {
           path: getTraceLogPath(),
           config: getTraceConfig(),

src/main/debug-setup.ts

@@ -279,6 +279,8 @@ function getSupportBundleEstimate(
     + Number(logSummary.mainBackup.exists)
     + Number(logSummary.audit.exists)
     + Number(logSummary.auditBackup.exists)
+    + Number(logSummary.rename.exists)
+    + Number(logSummary.renameBackup.exists)
     + Number(logSummary.session.exists)
     + Number(logSummary.trace.exists)
     + Number(logSummary.traceBackup.exists)
@@ -317,6 +319,8 @@ export function getDebugSetupCheck(baseDir: string): DebugSetupCheckResult {
     mainBackup: getFileSizeInfo(path.join(baseDir, "rd_downloader.log.old")),
     audit: getFileSizeInfo(path.join(baseDir, "audit.log")),
     auditBackup: getFileSizeInfo(path.join(baseDir, "audit.log.old")),
+    rename: getFileSizeInfo(path.join(baseDir, "rename.log")),
+    renameBackup: getFileSizeInfo(path.join(baseDir, "rename.log.old")),
     session: getFileSizeInfo(sessionLogPath),
     trace: getFileSizeInfo(traceLogPath),
     traceBackup: getFileSizeInfo(path.join(baseDir, "trace.log.old")),
@@ -330,6 +334,8 @@ export function getDebugSetupCheck(baseDir: string): DebugSetupCheckResult {
     logSummary.mainBackup.bytes,
     logSummary.audit.bytes,
     logSummary.auditBackup.bytes,
+    logSummary.rename.bytes,
+    logSummary.renameBackup.bytes,
     logSummary.session.bytes,
     logSummary.trace.bytes,
     logSummary.traceBackup.bytes,

src/main/download-manager.ts

@@ -55,6 +55,7 @@ import { validateFileAgainstManifest } from "./integrity";
 import { logger } from "./logger";
 import { ensureItemLog, getItemLogPath as getPersistedItemLogPath, logItemEvent as writeItemLogEvent } from "./item-log";
 import { ensurePackageLog, getPackageLogPath as getPersistedPackageLogPath, logPackageEvent as writePackageLogEvent } from "./package-log";
+import { logRenameEvent as writeRenameLogEvent } from "./rename-log";
 import { StoragePaths, saveSession, saveSessionAsync, saveSettings, saveSettingsAsync } from "./storage";
 import { compactErrorText, ensureDirPath, filenameFromUrl, formatEta, humanSize, looksLikeOpaqueFilename, nowMs, sanitizeFilename, sleep } from "./utils";
 
@@ -185,6 +186,28 @@ function inspectPackageItemDiskState(pkg: PackageEntry, item: DownloadItem): Pac
   }
 }
 
+function stripArchiveSuffixForMatching(fileName: string): string {
+  const trimmed = path.basename(String(fileName || "").trim());
+  if (!trimmed) {
+    return "";
+  }
+  let next = trimmed.replace(/\.(?:part\d+\.rar|zip\.\d+|7z\.\d+|rar|r\d{2,3}|zip|7z|\d{3})$/i, "");
+  next = next.replace(/\.part\d+$/i, "").replace(/\.vol\d+[+\d]*$/i, "");
+  return next.toLowerCase();
+}
+
+function isPreferredArchiveEntryPointName(fileName: string): boolean {
+  const normalized = path.basename(String(fileName || "").trim()).toLowerCase();
+  if (!normalized) {
+    return false;
+  }
+  return /\.part0*1\.rar$/.test(normalized)
+    || (/\.rar$/.test(normalized) && !/\.part\d+\.rar$/.test(normalized) && !/\.r\d{2,3}$/.test(normalized))
+    || /\.zip\.001$/.test(normalized)
+    || /\.7z\.001$/.test(normalized)
+    || (/\.001$/.test(normalized) && !/\.(zip|7z)\.001$/.test(normalized));
+}
+
 function getDownloadStallTimeoutMs(): number {
   const fromEnv = Number(process.env.RD_STALL_TIMEOUT_MS ?? NaN);
   if (Number.isFinite(fromEnv) && fromEnv >= 2000 && fromEnv <= 600000) {
@@ -1438,6 +1461,141 @@ export class DownloadManager extends EventEmitter {
     });
   }
 
+  private logItemOnly(
+    item: DownloadItem,
+    level: "INFO" | "WARN" | "ERROR",
+    message: string,
+    fields?: Record<string, unknown>
+  ): void {
+    const pkg = this.session.packages[item.packageId];
+    this.ensureItemLogForItem(item);
+    writeItemLogEvent(item.id, level, message, {
+      packageId: item.packageId,
+      packageName: pkg?.name || "",
+      itemId: item.id,
+      fileName: item.fileName,
+      status: item.status,
+      targetPath: item.targetPath,
+      ...fields
+    });
+  }
+
+  private collectRenameMatchTokensForItem(pkg: PackageEntry, item: DownloadItem): string[] {
+    const tokens = new Set<string>();
+    const maybeAdd = (value: string | null | undefined): void => {
+      const normalized = String(value || "").trim().toLowerCase();
+      if (!normalized || normalized.length < 4) {
+        return;
+      }
+      tokens.add(normalized);
+    };
+
+    maybeAdd(stripArchiveSuffixForMatching(item.fileName || ""));
+    maybeAdd(stripArchiveSuffixForMatching(item.targetPath ? path.basename(item.targetPath) : ""));
+    const diskPath = resolvePackageItemDiskPath(pkg, item);
+    if (diskPath) {
+      maybeAdd(stripArchiveSuffixForMatching(path.basename(diskPath)));
+    }
+    const episodeToken = extractEpisodeToken(item.fileName || path.basename(item.targetPath || ""));
+    if (episodeToken) {
+      maybeAdd(episodeToken);
+    }
+    return [...tokens].sort((a, b) => b.length - a.length);
+  }
+
+  private inferItemForMediaLog(
+    pkg: PackageEntry,
+    ...candidates: Array<string | null | undefined>
+  ): { item: DownloadItem | null; matchedBy: string | null } {
+    const items = pkg.itemIds
+      .map((itemId) => this.session.items[itemId])
+      .filter(Boolean) as DownloadItem[];
+    if (items.length === 0) {
+      return { item: null, matchedBy: null };
+    }
+    if (items.length === 1) {
+      return { item: items[0] || null, matchedBy: items[0] ? "single_item_package" : null };
+    }
+
+    const haystack = candidates
+      .map((value) => String(value || "").trim().toLowerCase())
+      .filter(Boolean)
+      .join(" || ");
+    if (!haystack) {
+      return { item: null, matchedBy: null };
+    }
+
+    let bestItem: DownloadItem | null = null;
+    let bestScore = 0;
+    let bestMatchedBy: string | null = null;
+    let bestPreferredEntry = false;
+    let ambiguous = false;
+
+    for (const item of items) {
+      const fileName = item.fileName || path.basename(item.targetPath || "");
+      const preferredEntry = isPreferredArchiveEntryPointName(fileName);
+      let score = preferredEntry ? 5 : 0;
+      let matchedBy: string | null = preferredEntry ? "entry_point" : null;
+
+      const episodeToken = extractEpisodeToken(fileName);
+      if (episodeToken && haystack.includes(episodeToken.toLowerCase())) {
+        score = 110 + (preferredEntry ? 5 : 0);
+        matchedBy = "episode_token";
+      } else {
+        for (const token of this.collectRenameMatchTokensForItem(pkg, item)) {
+          if (haystack.includes(token)) {
+            score = Math.max(score, Math.min(100, 40 + token.length) + (preferredEntry ? 5 : 0));
+            matchedBy = token === episodeToken?.toLowerCase() ? "episode_token" : `token:${token}`;
+            break;
+          }
+        }
+      }
+
+      if (score > bestScore || (score === bestScore && score > 0 && preferredEntry && !bestPreferredEntry)) {
+        bestItem = item;
+        bestScore = score;
+        bestMatchedBy = matchedBy;
+        bestPreferredEntry = preferredEntry;
+        ambiguous = false;
+        continue;
+      }
+      if (score > 0 && score === bestScore && preferredEntry === bestPreferredEntry) {
+        ambiguous = true;
+      }
+    }
+
+    if (ambiguous || !bestItem || bestScore <= 0) {
+      return { item: null, matchedBy: null };
+    }
+    return { item: bestItem, matchedBy: bestMatchedBy };
+  }
+
+  private logRenameProcess(
+    pkg: PackageEntry,
+    level: "INFO" | "WARN" | "ERROR",
+    stage: "auto-rename" | "mkv-move",
+    message: string,
+    fields?: Record<string, unknown>,
+    item?: DownloadItem | null,
+    matchedBy?: string | null
+  ): void {
+    writeRenameLogEvent(level, message, {
+      stage,
+      packageId: pkg.id,
+      packageName: pkg.name,
+      ...(item ? { itemId: item.id, fileName: item.fileName } : {}),
+      ...(matchedBy ? { matchedBy } : {}),
+      ...fields
+    });
+    if (item) {
+      this.logItemOnly(item, level, message, {
+        stage,
+        ...(matchedBy ? { matchedBy } : {}),
+        ...fields
+      });
+    }
+  }
+
   public setSettings(next: AppSettings): void {
     const previous = this.settings;
     next.totalDownloadedAllTime = Math.max(next.totalDownloadedAllTime || 0, this.settings.totalDownloadedAllTime || 0);
@@ -2793,6 +2951,10 @@ export class DownloadManager extends EventEmitter {
         extractDir,
         videoFiles: videoFiles.length
       });
+      this.logRenameProcess(pkg, "INFO", "auto-rename", "Auto-Rename Scan gestartet", {
+        extractDir,
+        videoFiles: videoFiles.length
+      });
     }
     let renamed = 0;
 
@@ -2840,6 +3002,12 @@ export class DownloadManager extends EventEmitter {
       const targetBaseName = buildAutoRenameBaseNameFromFoldersWithOptions(folderCandidates, sourceBaseName, {
         forceEpisodeForSeasonFolder: true
       });
+      const resolveRenameItem = (...extra: Array<string | null | undefined>): { item: DownloadItem | null; matchedBy: string | null } => {
+        if (!pkg) {
+          return { item: null, matchedBy: null };
+        }
+        return this.inferItemForMediaLog(pkg, sourcePath, sourceName, folderCandidates.join(" "), targetBaseName || "", ...extra);
+      };
       if (!targetBaseName) {
         if (pkg) {
           this.logPackageForPackage(pkg, "WARN", "Auto-Rename übersprungen: kein Zielname", {
@@ -2847,6 +3015,13 @@ export class DownloadManager extends EventEmitter {
             sourceBaseName,
             folders: folderCandidates.join(", ")
           });
+          const resolved = resolveRenameItem();
+          this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename übersprungen: kein Zielname", {
+            sourcePath,
+            sourceName,
+            sourceBaseName,
+            folders: folderCandidates.join(", ")
+          }, resolved.item, resolved.matchedBy);
         }
         logger.info(`Auto-Rename: kein Zielname für ${sourceName} (folders=${folderCandidates.join(", ")})`);
         continue;
@@ -2859,6 +3034,16 @@ export class DownloadManager extends EventEmitter {
           targetPath = this.buildSafeAutoRenameTargetPath(sourcePath, fallbackBaseName, sourceExt);
           if (targetPath) {
             logger.warn(`Auto-Rename Fallback wegen Pfadlänge: ${sourceName} -> ${path.basename(targetPath)}`);
+            if (pkg) {
+              const resolved = resolveRenameItem(targetPath, fallbackBaseName);
+              this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename Fallback wegen Pfadlänge gewählt", {
+                sourcePath,
+                sourceName,
+                targetPath,
+                targetBaseName,
+                fallbackBaseName
+              }, resolved.item, resolved.matchedBy);
+            }
           }
         }
         if (!targetPath) {
@@ -2867,6 +3052,16 @@ export class DownloadManager extends EventEmitter {
             targetPath = this.buildSafeAutoRenameTargetPath(sourcePath, veryShortFallback, sourceExt);
             if (targetPath) {
               logger.warn(`Auto-Rename Kurz-Fallback wegen Pfadlänge: ${sourceName} -> ${path.basename(targetPath)}`);
+              if (pkg) {
+                const resolved = resolveRenameItem(targetPath, veryShortFallback);
+                this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename Kurz-Fallback wegen Pfadlänge gewählt", {
+                  sourcePath,
+                  sourceName,
+                  targetPath,
+                  targetBaseName,
+                  fallbackBaseName: veryShortFallback
+                }, resolved.item, resolved.matchedBy);
+              }
             }
           }
         }
@@ -2878,11 +3073,27 @@ export class DownloadManager extends EventEmitter {
             sourceBaseName,
             targetBaseName
           });
+          const resolved = resolveRenameItem();
+          this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename übersprungen: Zielpfad ungültig", {
+            sourcePath,
+            sourceName,
+            sourceBaseName,
+            targetBaseName
+          }, resolved.item, resolved.matchedBy);
         }
         logger.warn(`Auto-Rename übersprungen (Zielpfad zu lang/ungültig): ${sourcePath}`);
         continue;
       }
       if (pathKey(targetPath) === pathKey(sourcePath)) {
+        if (pkg) {
+          const resolved = resolveRenameItem(targetPath);
+          this.logRenameProcess(pkg, "INFO", "auto-rename", "Auto-Rename übersprungen: Name bereits passend", {
+            sourcePath,
+            sourceName,
+            targetPath,
+            targetBaseName
+          }, resolved.item, resolved.matchedBy);
+        }
         continue;
       }
       if (await this.existsAsync(targetPath)) {
@@ -2891,6 +3102,13 @@ export class DownloadManager extends EventEmitter {
             sourceName,
             targetPath
           });
+          const resolved = resolveRenameItem(targetPath);
+          this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename übersprungen: Ziel existiert", {
+            sourcePath,
+            sourceName,
+            targetPath,
+            targetBaseName
+          }, resolved.item, resolved.matchedBy);
         }
         logger.warn(`Auto-Rename übersprungen (Ziel existiert): ${targetPath}`);
         continue;
@@ -2904,6 +3122,14 @@ export class DownloadManager extends EventEmitter {
             targetPath,
             sourceName
           });
+          const resolved = resolveRenameItem(targetPath);
+          this.logRenameProcess(pkg, "INFO", "auto-rename", "Auto-Rename durchgeführt", {
+            sourcePath,
+            targetPath,
+            sourceName,
+            targetBaseName,
+            folders: folderCandidates.join(", ")
+          }, resolved.item, resolved.matchedBy);
         }
         logger.info(`Auto-Rename: ${sourceName} -> ${path.basename(targetPath)}`);
         renamed += 1;
@@ -2926,6 +3152,16 @@ export class DownloadManager extends EventEmitter {
               await this.renamePathWithExdevFallback(sourcePath, fallbackPath);
               logger.warn(`Auto-Rename Fallback wegen Pfadlänge: ${sourceName} -> ${path.basename(fallbackPath)}`);
               renamed += 1;
+              if (pkg) {
+                const resolved = resolveRenameItem(fallbackPath, fallbackBaseName);
+                this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename Fallback durchgeführt", {
+                  sourcePath,
+                  sourceName,
+                  targetPath: fallbackPath,
+                  targetBaseName,
+                  fallbackBaseName
+                }, resolved.item, resolved.matchedBy);
+              }
               fallbackRenamed = true;
               break;
             } catch {
@@ -2942,6 +3178,15 @@ export class DownloadManager extends EventEmitter {
             sourceName,
             error: compactErrorText(error)
           });
+          const resolved = resolveRenameItem(targetPath);
+          this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename fehlgeschlagen", {
+            sourcePath,
+            sourceName,
+            targetPath,
+            targetBaseName,
+            folders: folderCandidates.join(", "),
+            error: compactErrorText(error)
+          }, resolved.item, resolved.matchedBy);
         }
       }
     }
@@ -2952,6 +3197,10 @@ export class DownloadManager extends EventEmitter {
         this.logPackageForPackage(pkg, "INFO", "Auto-Rename abgeschlossen", {
           renamed
         });
+        this.logRenameProcess(pkg, "INFO", "auto-rename", "Auto-Rename abgeschlossen", {
+          extractDir,
+          renamed
+        });
       }
     }
     return renamed;
@@ -3152,6 +3401,12 @@ export class DownloadManager extends EventEmitter {
       return;
     }
 
+    this.logRenameProcess(pkg, "INFO", "mkv-move", "MKV-Sammelordner Scan gestartet", {
+      sourceDir,
+      targetDir,
+      mkvFiles: mkvFiles.length
+    });
+
     const reservedTargets = new Set<string>();
     let moved = 0;
     let skipped = 0;
@@ -3174,6 +3429,12 @@ export class DownloadManager extends EventEmitter {
       }
       if (sourceSize === 0) {
         logger.warn(`MKV-Sammelordner: überspringe 0-Byte-Datei ${path.basename(sourcePath)}`);
+        const resolved = this.inferItemForMediaLog(pkg, sourcePath, path.basename(sourcePath), targetDir);
+        this.logRenameProcess(pkg, "WARN", "mkv-move", "MKV übersprungen: 0-Byte-Datei", {
+          sourcePath,
+          targetDir,
+          sourceSize
+        }, resolved.item, resolved.matchedBy);
         skipped += 1;
         continue;
       }
@@ -3184,6 +3445,12 @@ export class DownloadManager extends EventEmitter {
         const existingStat = await fs.promises.stat(idealTargetPath);
         if (existingStat.size === sourceSize) {
           logger.info(`MKV-Sammelordner: Duplikat übersprungen (gleiche Größe ${humanSize(sourceSize)}): ${path.basename(sourcePath)}`);
+          const resolved = this.inferItemForMediaLog(pkg, sourcePath, path.basename(sourcePath), idealTargetPath);
+          this.logRenameProcess(pkg, "INFO", "mkv-move", "MKV-Duplikat übersprungen", {
+            sourcePath,
+            targetPath: idealTargetPath,
+            sourceSize
+          }, resolved.item, resolved.matchedBy);
           // Remove the duplicate source file to avoid future re-processing
           try { await fs.promises.unlink(sourcePath); } catch { /* ignore */ }
           skipped += 1;
@@ -3207,6 +3474,12 @@ export class DownloadManager extends EventEmitter {
           targetPath,
           sourceSize
         });
+        const resolved = this.inferItemForMediaLog(pkg, sourcePath, path.basename(sourcePath), targetPath);
+        this.logRenameProcess(pkg, "INFO", "mkv-move", "MKV verschoben", {
+          sourcePath,
+          targetPath,
+          sourceSize
+        }, resolved.item, resolved.matchedBy);
       } catch (error) {
         failed += 1;
         logger.warn(`MKV verschieben fehlgeschlagen: ${sourcePath} -> ${targetPath} (${compactErrorText(error)})`);
@@ -3215,6 +3488,13 @@ export class DownloadManager extends EventEmitter {
           targetPath,
           error: compactErrorText(error)
         });
+        const resolved = this.inferItemForMediaLog(pkg, sourcePath, path.basename(sourcePath), targetPath);
+        this.logRenameProcess(pkg, "WARN", "mkv-move", "MKV verschieben fehlgeschlagen", {
+          sourcePath,
+          targetPath,
+          sourceSize,
+          error: compactErrorText(error)
+        }, resolved.item, resolved.matchedBy);
       }
     }
 
@@ -3230,6 +3510,13 @@ export class DownloadManager extends EventEmitter {
     }
 
     logger.info(`MKV-Sammelordner: pkg=${pkg.name}, packageId=${packageId}, moved=${moved}, skipped=${skipped}, failed=${failed}, target=${targetDir}`);
+    this.logRenameProcess(pkg, "INFO", "mkv-move", "MKV-Sammelordner abgeschlossen", {
+      sourceDir,
+      targetDir,
+      moved,
+      skipped,
+      failed
+    });
   }
 
   public cancelPackage(packageId: string): void {

src/main/main.ts

@@ -550,6 +550,13 @@ function registerIpcHandlers(): void {
     }
   });
 
+  ipcMain.handle(IPC_CHANNELS.OPEN_RENAME_LOG, async () => {
+    const logPath = controller.getRenameLogPath();
+    if (logPath) {
+      await shell.openPath(logPath);
+    }
+  });
+
   ipcMain.handle(IPC_CHANNELS.OPEN_SESSION_LOG, async () => {
     const logPath = controller.getSessionLogPath();
     if (logPath) {

src/main/rename-log.ts

@@ -0,0 +1,123 @@
+import fs from "node:fs";
+import path from "node:path";
+
+type RenameLogLevel = "INFO" | "WARN" | "ERROR";
+
+const RENAME_LOG_MAX_FILE_BYTES = Number(process.env.RD_RENAME_LOG_MAX_BYTES || 10 * 1024 * 1024);
+const RENAME_LOG_RETENTION_DAYS = Number(process.env.RD_RENAME_LOG_RETENTION_DAYS || 30);
+
+let renameLogPath: string | null = null;
+
+function sanitizeFieldValue(value: unknown): string {
+  if (value === undefined || value === null) {
+    return "";
+  }
+  if (typeof value === "string") {
+    return value.replace(/\r?\n/g, "\\n");
+  }
+  if (typeof value === "number" || typeof value === "boolean") {
+    return String(value);
+  }
+  try {
+    return JSON.stringify(value).replace(/\r?\n/g, "\\n");
+  } catch {
+    return String(value);
+  }
+}
+
+function formatFields(fields?: Record<string, unknown>): string {
+  if (!fields) {
+    return "";
+  }
+  const parts = Object.entries(fields)
+    .filter(([, value]) => value !== undefined && value !== null && sanitizeFieldValue(value) !== "")
+    .map(([key, value]) => `${key}=${sanitizeFieldValue(value)}`);
+  return parts.length > 0 ? ` | ${parts.join(" | ")}` : "";
+}
+
+function rotateIfNeeded(filePath: string): void {
+  try {
+    const stat = fs.statSync(filePath);
+    if (stat.size < RENAME_LOG_MAX_FILE_BYTES) {
+      return;
+    }
+    const backup = `${filePath}.old`;
+    try {
+      fs.rmSync(backup, { force: true });
+    } catch {
+      // ignore
+    }
+    fs.renameSync(filePath, backup);
+  } catch {
+    // ignore
+  }
+}
+
+function cleanupOldBackup(filePath: string): void {
+  const backup = `${filePath}.old`;
+  try {
+    const stat = fs.statSync(backup);
+    const cutoff = Date.now() - RENAME_LOG_RETENTION_DAYS * 24 * 60 * 60 * 1000;
+    if (stat.mtimeMs < cutoff) {
+      fs.rmSync(backup, { force: true });
+    }
+  } catch {
+    // ignore
+  }
+}
+
+export function initRenameLog(baseDir: string): void {
+  renameLogPath = path.join(baseDir, "rename.log");
+  try {
+    fs.mkdirSync(path.dirname(renameLogPath), { recursive: true });
+    cleanupOldBackup(renameLogPath);
+    if (!fs.existsSync(renameLogPath)) {
+      fs.writeFileSync(renameLogPath, "", "utf8");
+    }
+    rotateIfNeeded(renameLogPath);
+    if (!fs.existsSync(renameLogPath)) {
+      fs.writeFileSync(renameLogPath, "", "utf8");
+    }
+    fs.appendFileSync(renameLogPath, `=== Rename-Log Start: ${new Date().toISOString()} ===\n`, "utf8");
+  } catch {
+    renameLogPath = null;
+  }
+}
+
+export function logRenameEvent(level: RenameLogLevel, message: string, fields?: Record<string, unknown>): void {
+  if (!renameLogPath) {
+    return;
+  }
+  try {
+    rotateIfNeeded(renameLogPath);
+    if (!fs.existsSync(renameLogPath)) {
+      fs.writeFileSync(renameLogPath, "", "utf8");
+    }
+    fs.appendFileSync(
+      renameLogPath,
+      `${new Date().toISOString()} [${level}] ${message}${formatFields(fields)}\n`,
+      "utf8"
+    );
+  } catch {
+    // ignore write errors
+  }
+}
+
+export function getRenameLogPath(): string | null {
+  if (!renameLogPath) {
+    return null;
+  }
+  return fs.existsSync(renameLogPath) ? renameLogPath : null;
+}
+
+export function shutdownRenameLog(): void {
+  if (!renameLogPath) {
+    return;
+  }
+  try {
+    fs.appendFileSync(renameLogPath, `=== Rename-Log Ende: ${new Date().toISOString()} ===\n`, "utf8");
+  } catch {
+    // ignore
+  }
+  renameLogPath = null;
+}

src/main/support-bundle.ts

@@ -6,6 +6,7 @@ import { getAuditLogPath } from "./audit-log";
 import { getDebugSetupCheck } from "./debug-setup";
 import { getLogFilePath } from "./logger";
 import { getPackageLogPath } from "./package-log";
+import { getRenameLogPath } from "./rename-log";
 import { getSessionLogPath } from "./session-log";
 import { createStoragePaths, loadHistory, loadSettings } from "./storage";
 import { buildAccountSummary, buildRedactedSettingsPayload, buildStatsPayload, summarizeHistoryEntry } from "./support-data";
@@ -120,6 +121,8 @@ export function buildSupportBundle(manager: DownloadManager, baseDir: string): B
   addFileIfExists(zip, `${getLogFilePath()}.old`, "logs/rd_downloader.log.old");
   addFileIfExists(zip, getAuditLogPath(), "logs/audit.log");
   addFileIfExists(zip, getAuditLogPath() ? `${getAuditLogPath()}.old` : null, "logs/audit.log.old");
+  addFileIfExists(zip, getRenameLogPath(), "logs/rename.log");
+  addFileIfExists(zip, getRenameLogPath() ? `${getRenameLogPath()}.old` : null, "logs/rename.log.old");
   addFileIfExists(zip, getSessionLogPath(), "logs/session.log");
   addFileIfExists(zip, getTraceLogPath(), "logs/trace.log");
   addFileIfExists(zip, getTraceLogPath() ? `${getTraceLogPath()}.old` : null, "logs/trace.log.old");

src/preload/preload.ts

@@ -61,6 +61,7 @@ const api: ElectronApi = {
   exportSupportBundle: (): Promise<{ saved: boolean; filePath?: string }> => ipcRenderer.invoke(IPC_CHANNELS.EXPORT_SUPPORT_BUNDLE),
   openLog: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_LOG),
   openAuditLog: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_AUDIT_LOG),
+  openRenameLog: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_RENAME_LOG),
   openSessionLog: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_SESSION_LOG),
   openTraceLog: (): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_TRACE_LOG),
   openPackageLog: (packageId: string): Promise<void> => ipcRenderer.invoke(IPC_CHANNELS.OPEN_PACKAGE_LOG, packageId),

src/renderer/App.tsx

@@ -169,6 +169,7 @@ function buildDebugSetupDetails(setup: DebugSetupCheckResult): string {
     formatFileLine("Gesamt", setup.logSummary.totalBytes),
     formatFileLine("Hauptlog", setup.logSummary.main.bytes + setup.logSummary.mainBackup.bytes),
     formatFileLine("Audit", setup.logSummary.audit.bytes + setup.logSummary.auditBackup.bytes),
+    formatFileLine("Rename", setup.logSummary.rename.bytes + setup.logSummary.renameBackup.bytes),
     formatFileLine("Trace", setup.logSummary.trace.bytes + setup.logSummary.traceBackup.bytes),
     `${formatFileLine("Session-Logs", setup.logSummary.session.bytes + setup.logSummary.sessionLogs.bytes)} | Dateien: ${setup.logSummary.sessionLogs.fileCount}`,
     `${formatFileLine("Paket-Logs", setup.logSummary.packageLogs.bytes)} | Dateien: ${setup.logSummary.packageLogs.fileCount}`,
@@ -3917,6 +3918,9 @@ export function App(): ReactElement {
               <button className="menu-dropdown-item" onClick={() => { closeMenus(); void window.rd.openAuditLog().catch(() => {}); }}>
                 <span>Audit-Log öffnen</span>
               </button>
+              <button className="menu-dropdown-item" onClick={() => { closeMenus(); void window.rd.openRenameLog().catch(() => {}); }}>
+                <span>Rename-Log öffnen</span>
+              </button>
               <button className="menu-dropdown-item" onClick={() => { closeMenus(); void window.rd.openSessionLog().catch(() => {}); }}>
                 <span>Session-Log öffnen</span>
               </button>

src/shared/ipc.ts

@@ -41,6 +41,7 @@ export const IPC_CHANNELS = {
   EXPORT_SUPPORT_BUNDLE: "app:export-support-bundle",
   OPEN_LOG: "app:open-log",
   OPEN_AUDIT_LOG: "app:open-audit-log",
+  OPEN_RENAME_LOG: "app:open-rename-log",
   OPEN_SESSION_LOG: "app:open-session-log",
   OPEN_TRACE_LOG: "app:open-trace-log",
   OPEN_PACKAGE_LOG: "app:open-package-log",

src/shared/preload-api.ts

@@ -58,6 +58,7 @@ export interface ElectronApi {
   exportSupportBundle: () => Promise<{ saved: boolean; filePath?: string }>;
   openLog: () => Promise<void>;
   openAuditLog: () => Promise<void>;
+  openRenameLog: () => Promise<void>;
   openSessionLog: () => Promise<void>;
   openTraceLog: () => Promise<void>;
   openPackageLog: (packageId: string) => Promise<void>;

src/shared/types.ts

@@ -399,6 +399,8 @@ export interface DebugSetupCheckResult {
     mainBackup: SupportFileSizeInfo;
     audit: SupportFileSizeInfo;
     auditBackup: SupportFileSizeInfo;
+    rename: SupportFileSizeInfo;
+    renameBackup: SupportFileSizeInfo;
     session: SupportFileSizeInfo;
     trace: SupportFileSizeInfo;
     traceBackup: SupportFileSizeInfo;

tests/debug-server.test.ts

@@ -46,6 +46,7 @@ import { startDebugServer, stopDebugServer } from "../src/main/debug-server";
 import { ensureItemLog, initItemLogs, shutdownItemLogs } from "../src/main/item-log";
 import { configureLogger, getLogFilePath, logger } from "../src/main/logger";
 import { ensurePackageLog, initPackageLogs, shutdownPackageLogs } from "../src/main/package-log";
+import { getRenameLogPath, initRenameLog, logRenameEvent, shutdownRenameLog } from "../src/main/rename-log";
 import { getSessionLogPath, initSessionLog, shutdownSessionLog } from "../src/main/session-log";
 import { createStoragePaths, saveHistory, saveSettings } from "../src/main/storage";
 import { getTraceConfigPath, getTraceLogPath, initTraceLog, logTraceEvent, setTraceEnabled, shutdownTraceLog } from "../src/main/trace-log";
@@ -235,6 +236,9 @@ async function createFixture() {
   }
   logAuditEvent("INFO", "AUDIT-LINE", { scope: "settings" });
 
+  initRenameLog(baseDir);
+  logRenameEvent("INFO", "RENAME-LINE", { stage: "auto-rename", sourcePath: "C:\\extract\\old.mkv" });
+
   initTraceLog(baseDir);
   setTraceEnabled(true, "test-fixture");
   logTraceEvent("INFO", "support", "TRACE-EVENT", { scope: "fixture" });
@@ -294,6 +298,7 @@ afterEach(() => {
   shutdownSessionLog();
   shutdownPackageLogs();
   shutdownItemLogs();
+  shutdownRenameLog();
   shutdownTraceLog();
   shutdownAuditLog();
   while (tempDirs.length > 0) {
@@ -324,6 +329,7 @@ describe("debug-server", () => {
     expect(payload.selectedPackage?.name).toBe("server-package");
     expect((payload.logs?.main?.lines || []).join("\n")).toContain("MAIN-LINE");
     expect((payload.logs?.audit?.lines || []).join("\n")).toContain("AUDIT-LINE");
+    expect((payload.logs?.rename?.lines || []).join("\n")).toContain("RENAME-LINE");
     expect((payload.logs?.trace?.lines || []).join("\n")).toContain("TRACE-EVENT");
     expect((payload.logs?.session?.lines || []).join("\n")).toContain("SESSION-LINE");
     expect((payload.logs?.package?.lines || []).join("\n")).toContain("PACKAGE-LINE");
@@ -353,6 +359,7 @@ describe("debug-server", () => {
     expect(metaPayload.supportFiles?.aiManifest).toBe(manifestPath);
     expect(metaPayload.supportFiles?.traceConfig).toBe(getTraceConfigPath());
     expect(metaPayload.supportFiles?.traceLog).toBe(getTraceLogPath());
+    expect(metaPayload.logPaths?.rename).toBe(getRenameLogPath());
     expect(metaPayload.supportChecks?.setup).toBe("/debug/setup");
     expect(metaPayload.supportChecks?.selfCheck).toBe("/self-check");
   });
@@ -376,6 +383,7 @@ describe("debug-server", () => {
     expect(payload.diskSpace?.output?.freeBytes).toBeGreaterThan(0);
     expect(payload.diskSpace?.extract?.freeBytes).toBeGreaterThan(0);
     expect(payload.logSummary?.totalBytes).toBeGreaterThan(0);
+    expect(payload.logSummary?.rename?.bytes).toBeGreaterThan(0);
     expect(payload.logSummary?.packageLogs?.fileCount).toBe(1);
     expect(payload.logSummary?.itemLogs?.fileCount).toBe(1);
     expect(payload.supportBundle?.estimatedBytes).toBeGreaterThan(0);
@@ -437,6 +445,11 @@ describe("debug-server", () => {
     const auditPayload = await auditResponse.json() as Record<string, any>;
     expect((auditPayload.lines || []).join("\n")).toContain("AUDIT-LINE");
 
+    const renameResponse = await fetch(`${fixture.baseUrl}/logs/rename?token=${fixture.token}&lines=20`);
+    expect(renameResponse.ok).toBe(true);
+    const renamePayload = await renameResponse.json() as Record<string, any>;
+    expect((renamePayload.lines || []).join("\n")).toContain("RENAME-LINE");
+
     const traceResponse = await fetch(`${fixture.baseUrl}/logs/trace?token=${fixture.token}&lines=50`);
     expect(traceResponse.ok).toBe(true);
     const tracePayload = await traceResponse.json() as Record<string, any>;
@@ -492,6 +505,7 @@ describe("debug-server", () => {
     expect(entries).toContain("overview/self-check.json");
     expect(entries).toContain("overview/trace-config.json");
     expect(entries).toContain("logs/audit.log");
+    expect(entries).toContain("logs/rename.log");
     expect(entries).toContain("logs/trace.log");
     expect(entries).toContain("runtime/debug_ai_manifest.json");
     expect(entries).not.toContain("runtime/debug_token.txt");

tests/download-manager.test.ts

@@ -9,8 +9,10 @@ import { DownloadManager, extractArchiveNameFromExtractorLogMessage, getAuthorit
 import { defaultSettings } from "../src/main/constants";
 import { parseDebridLinkApiKeys } from "../src/shared/debrid-link-keys";
 import { getProviderUsageDayKey } from "../src/shared/provider-daily-limits";
+import { getItemLogPath, initItemLogs, shutdownItemLogs } from "../src/main/item-log";
 import { createStoragePaths, emptySession } from "../src/main/storage";
 import { primeDebridLinkRuntimeCooldownForTests, resetDebridLinkRuntimeStateForTests } from "../src/main/debrid";
+import { getRenameLogPath, initRenameLog, shutdownRenameLog } from "../src/main/rename-log";
 
 const tempDirs: string[] = [];
 const originalFetch = globalThis.fetch;
@@ -56,6 +58,8 @@ async function removeDirWithRetries(dir: string): Promise<void> {
 afterEach(async () => {
   globalThis.fetch = originalFetch;
   resetDebridLinkRuntimeStateForTests();
+  shutdownItemLogs();
+  shutdownRenameLog();
   for (const dir of tempDirs.splice(0)) {
     await removeDirWithRetries(dir);
   }
@@ -6705,6 +6709,50 @@ describe("download manager", () => {
     expect(fs.existsSync(originalExtractedPath)).toBe(false);
   });
 
+  it("writes auto-rename details into rename and item logs", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
+    tempDirs.push(root);
+
+    const packageName = "Asbest.S02.GERMAN.720p.WEB.AVC-4SF";
+    const sourceFileName = "4sf-asbest.web.7p-s02e01.mkv";
+    const expectedFileName = "Asbest.S02E01.GERMAN.720p.WEB.AVC-4SF.mkv";
+    const { session, itemId, extractDir } = createCompletedArchiveSession(root, packageName, sourceFileName);
+    const stateDir = path.join(root, "state");
+    initItemLogs(stateDir);
+    initRenameLog(stateDir);
+
+    new DownloadManager(
+      {
+        ...defaultSettings(),
+        token: "rd-token",
+        outputDir: path.join(root, "downloads"),
+        extractDir: path.join(root, "extract"),
+        autoExtract: true,
+        autoRename4sf4sj: true,
+        enableIntegrityCheck: false,
+        cleanupMode: "none"
+      },
+      session,
+      createStoragePaths(stateDir)
+    );
+
+    const expectedPath = path.join(extractDir, expectedFileName);
+    await waitFor(() => fs.existsSync(expectedPath), 12000);
+    await new Promise((resolve) => setTimeout(resolve, 350));
+
+    const renameLogPath = getRenameLogPath();
+    expect(renameLogPath).not.toBeNull();
+    const renameContent = fs.readFileSync(renameLogPath!, "utf8");
+    expect(renameContent).toContain("Auto-Rename durchgeführt");
+    expect(renameContent).toContain(`targetPath=${expectedPath}`);
+
+    const itemLogPath = getItemLogPath(itemId);
+    expect(itemLogPath).not.toBeNull();
+    const itemContent = fs.readFileSync(itemLogPath!, "utf8");
+    expect(itemContent).toContain("Auto-Rename durchgeführt");
+    expect(itemContent).toContain("stage=auto-rename");
+  }, 20000);
+
   it("adds REPACK marker from rp token and supports 4SJ folders", async () => {
     const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
     tempDirs.push(root);

tests/rename-log.test.ts

@@ -0,0 +1,52 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { getRenameLogPath, initRenameLog, logRenameEvent, shutdownRenameLog } from "../src/main/rename-log";
+
+const tempDirs: string[] = [];
+
+afterEach(() => {
+  shutdownRenameLog();
+  for (const dir of tempDirs.splice(0)) {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+describe("rename-log", () => {
+  it("writes rename events to the rename log", () => {
+    const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-rlog-"));
+    tempDirs.push(baseDir);
+
+    initRenameLog(baseDir);
+    logRenameEvent("INFO", "Auto-Rename durchgeführt", {
+      packageName: "Test Paket",
+      sourcePath: "C:\\extract\\old.mkv",
+      targetPath: "C:\\extract\\new.mkv"
+    });
+
+    const logPath = getRenameLogPath();
+    expect(logPath).not.toBeNull();
+    expect(fs.existsSync(logPath!)).toBe(true);
+    const content = fs.readFileSync(logPath!, "utf8");
+    expect(content).toContain("Rename-Log Start");
+    expect(content).toContain("Auto-Rename durchgeführt");
+    expect(content).toContain("sourcePath=C:\\extract\\old.mkv");
+  });
+
+  it("rotates oversized rename logs on startup", () => {
+    const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-rlog-rotate-"));
+    tempDirs.push(baseDir);
+
+    const oversizedPath = path.join(baseDir, "rename.log");
+    fs.mkdirSync(baseDir, { recursive: true });
+    fs.writeFileSync(oversizedPath, "x".repeat(10 * 1024 * 1024 + 256), "utf8");
+
+    initRenameLog(baseDir);
+
+    expect(fs.existsSync(oversizedPath)).toBe(true);
+    expect(fs.existsSync(`${oversizedPath}.old`)).toBe(true);
+    const content = fs.readFileSync(oversizedPath, "utf8");
+    expect(content).toContain("Rename-Log Start");
+  });
+});