diff --git a/electron/services/chatService.ts b/electron/services/chatService.ts
index 5d58177..5f305c1 100644
--- a/electron/services/chatService.ts
+++ b/electron/services/chatService.ts
@@ -4336,9 +4336,9 @@ class ChatService {
         encrypVer = imageInfo.encrypVer
         cdnThumbUrl = imageInfo.cdnThumbUrl
         imageDatName = this.parseImageDatNameFromRow(row)
-      } else if (localType === 43 && content) {
-        // 视频消息
-        videoMd5 = this.parseVideoMd5(content)
+      } else if (localType === 43) {
+        // 视频消息：优先从 packed_info_data 提取真实文件名（32位十六进制），再回退 XML
+        videoMd5 = this.parseVideoFileNameFromRow(row, content)
       } else if (localType === 34 && content) {
         voiceDurationSeconds = this.parseVoiceDurationSeconds(content)
       } else if (localType === 42 && content) {
@@ -4876,7 +4876,20 @@ class ChatService {
   }
 
   private parseImageDatNameFromRow(row: Record<string, any>): string | undefined {
-    const packed = row.packed_info_data
+    const packed = this.getRowField(row, [
+      'packed_info_data',
+      'packedInfoData',
+      'packed_info_blob',
+      'packedInfoBlob',
+      'packed_info',
+      'packedInfo',
+      'BytesExtra',
+      'bytes_extra',
+      'WCDB_CT_packed_info',
+      'reserved0',
+      'Reserved0',
+      'WCDB_CT_Reserved0'
+    ])
     const buffer = this.decodePackedInfo(packed)
     if (!buffer || buffer.length === 0) return undefined
     const printable: number[] = []
@@ -4894,6 +4907,81 @@ class ChatService {
     return hexMatch?.[1]?.toLowerCase()
   }
 
+  private parseVideoFileNameFromRow(row: Record<string, any>, content?: string): string | undefined {
+    const packed = this.getRowField(row, [
+      'packed_info_data',
+      'packedInfoData',
+      'packed_info_blob',
+      'packedInfoBlob',
+      'packed_info',
+      'packedInfo',
+      'BytesExtra',
+      'bytes_extra',
+      'WCDB_CT_packed_info',
+      'reserved0',
+      'Reserved0',
+      'WCDB_CT_Reserved0'
+    ])
+    const packedToken = this.extractVideoTokenFromPackedRaw(packed)
+    if (packedToken) return packedToken
+
+    const byColumn = this.normalizeVideoFileToken(this.getRowField(row, [
+      'video_md5',
+      'videoMd5',
+      'raw_md5',
+      'rawMd5',
+      'video_file_name',
+      'videoFileName'
+    ]))
+    if (byColumn) return byColumn
+
+    return this.normalizeVideoFileToken(this.parseVideoMd5(content || ''))
+  }
+
+  private normalizeVideoFileToken(value: unknown): string | undefined {
+    let text = String(value || '').trim().toLowerCase()
+    if (!text) return undefined
+    text = text.replace(/^.*[\\/]/, '')
+    text = text.replace(/\.(?:mp4|mov|m4v|avi|mkv|flv|jpg|jpeg|png|gif|dat)$/i, '')
+    text = text.replace(/_thumb$/, '')
+    const directMatch = /^([a-f0-9]{16,64})(?:_raw)?$/i.exec(text)
+    if (directMatch) {
+      const suffix = /_raw$/i.test(text) ? '_raw' : ''
+      return `${directMatch[1].toLowerCase()}${suffix}`
+    }
+    const preferred32 = /([a-f0-9]{32})(?![a-f0-9])/i.exec(text)
+    if (preferred32?.[1]) return preferred32[1].toLowerCase()
+    const generic = /([a-f0-9]{16,64})(?![a-f0-9])/i.exec(text)
+    return generic?.[1]?.toLowerCase()
+  }
+
+  private extractVideoTokenFromPackedRaw(raw: unknown): string | undefined {
+    const buffer = this.decodePackedInfo(raw)
+    if (!buffer || buffer.length === 0) return undefined
+    const candidates: string[] = []
+    let current = ''
+    for (const byte of buffer) {
+      const isHex =
+        (byte >= 0x30 && byte <= 0x39) ||
+        (byte >= 0x41 && byte <= 0x46) ||
+        (byte >= 0x61 && byte <= 0x66)
+      if (isHex) {
+        current += String.fromCharCode(byte)
+        continue
+      }
+      if (current.length >= 16) candidates.push(current)
+      current = ''
+    }
+    if (current.length >= 16) candidates.push(current)
+    if (candidates.length === 0) return undefined
+
+    const exact32 = candidates.find((item) => item.length === 32)
+    if (exact32) return exact32.toLowerCase()
+
+    const fallback = candidates.find((item) => item.length >= 16 && item.length <= 64)
+    return fallback?.toLowerCase()
+  }
+
   private decodePackedInfo(raw: any): Buffer | null {
     if (!raw) return null
     if (Buffer.isBuffer(raw)) return raw
@@ -4901,9 +4989,10 @@ class ChatService {
     if (Array.isArray(raw)) return Buffer.from(raw)
     if (typeof raw === 'string') {
       const trimmed = raw.trim()
-      if (/^[a-fA-F0-9]+$/.test(trimmed) && trimmed.length % 2 === 0) {
+      const compactHex = trimmed.replace(/\s+/g, '')
+      if (/^[a-fA-F0-9]+$/.test(compactHex) && compactHex.length % 2 === 0) {
         try {
-          return Buffer.from(trimmed, 'hex')
+          return Buffer.from(compactHex, 'hex')
         } catch { }
       }
       try {
@@ -10490,6 +10579,8 @@ class ChatService {
       const imgInfo = this.parseImageInfo(rawContent)
       Object.assign(msg, imgInfo)
       msg.imageDatName = this.parseImageDatNameFromRow(row)
+    } else if (msg.localType === 43) { // Video
+      msg.videoMd5 = this.parseVideoFileNameFromRow(row, rawContent)
     } else if (msg.localType === 47) { // Emoji
       const emojiInfo = this.parseEmojiInfo(rawContent)
       msg.emojiCdnUrl = emojiInfo.cdnUrl
diff --git a/electron/services/exportService.ts b/electron/services/exportService.ts
index fe44d51..3688afd 100644
--- a/electron/services/exportService.ts
+++ b/electron/services/exportService.ts
@@ -3780,7 +3780,6 @@ class ExportService {
 
     const md5Pattern = /^[a-f0-9]{32}$/i
     const imageMd5Set = new Set<string>()
-    const videoMd5Set = new Set<string>()
 
     let scanIndex = 0
     for (const msg of messages) {
@@ -3800,19 +3799,12 @@ class ExportService {
         }
       }
 
-      if (options.exportVideos && msg?.localType === 43) {
-        const videoMd5 = String(msg?.videoMd5 || '').trim().toLowerCase()
-        if (videoMd5) videoMd5Set.add(videoMd5)
-      }
     }
 
     const preloadTasks: Array<Promise<void>> = []
     if (imageMd5Set.size > 0) {
       preloadTasks.push(imageDecryptService.preloadImageHardlinkMd5s(Array.from(imageMd5Set)))
     }
-    if (videoMd5Set.size > 0) {
-      preloadTasks.push(videoService.preloadVideoHardlinkMd5s(Array.from(videoMd5Set)))
-    }
     if (preloadTasks.length === 0) return
 
     await Promise.all(preloadTasks.map((task) => task.catch(() => { })))
@@ -4102,6 +4094,95 @@ class ExportService {
     return tagMatch?.[1]?.toLowerCase()
   }
 
+  private decodePackedInfoBuffer(raw: unknown): Buffer | null {
+    if (!raw) return null
+    if (Buffer.isBuffer(raw)) return raw
+    if (raw instanceof Uint8Array) return Buffer.from(raw)
+    if (Array.isArray(raw)) return Buffer.from(raw)
+    if (typeof raw === 'string') {
+      const trimmed = raw.trim()
+      if (!trimmed) return null
+      const compactHex = trimmed.replace(/\s+/g, '')
+      if (/^[a-fA-F0-9]+$/.test(compactHex) && compactHex.length % 2 === 0) {
+        try {
+          return Buffer.from(compactHex, 'hex')
+        } catch { }
+      }
+      try {
+        const decoded = Buffer.from(trimmed, 'base64')
+        if (decoded.length > 0) return decoded
+      } catch { }
+      return null
+    }
+    if (typeof raw === 'object' && raw !== null && Array.isArray((raw as any).data)) {
+      return Buffer.from((raw as any).data)
+    }
+    return null
+  }
+
+  private normalizeVideoFileToken(value: unknown): string | undefined {
+    let text = String(value || '').trim().toLowerCase()
+    if (!text) return undefined
+    text = text.replace(/^.*[\\/]/, '')
+    text = text.replace(/\.(?:mp4|mov|m4v|avi|mkv|flv|jpg|jpeg|png|gif|dat)$/i, '')
+    text = text.replace(/_thumb$/, '')
+    const direct = /^([a-f0-9]{16,64})(?:_raw)?$/i.exec(text)
+    if (direct) {
+      const suffix = /_raw$/i.test(text) ? '_raw' : ''
+      return `${direct[1].toLowerCase()}${suffix}`
+    }
+    const preferred32 = /([a-f0-9]{32})(?![a-f0-9])/i.exec(text)
+    if (preferred32?.[1]) return preferred32[1].toLowerCase()
+    const fallback = /([a-f0-9]{16,64})(?![a-f0-9])/i.exec(text)
+    return fallback?.[1]?.toLowerCase()
+  }
+
+  private extractVideoFileNameFromPackedRaw(raw: unknown): string | undefined {
+    const buffer = this.decodePackedInfoBuffer(raw)
+    if (!buffer || buffer.length === 0) return undefined
+    const candidates: string[] = []
+    let current = ''
+    for (const byte of buffer) {
+      const isHex =
+        (byte >= 0x30 && byte <= 0x39) ||
+        (byte >= 0x41 && byte <= 0x46) ||
+        (byte >= 0x61 && byte <= 0x66)
+      if (isHex) {
+        current += String.fromCharCode(byte)
+        continue
+      }
+      if (current.length >= 16) candidates.push(current)
+      current = ''
+    }
+    if (current.length >= 16) candidates.push(current)
+    if (candidates.length === 0) return undefined
+
+    const exact32 = candidates.find((item) => item.length === 32)
+    if (exact32) return exact32.toLowerCase()
+    const fallback = candidates.find((item) => item.length >= 16 && item.length <= 64)
+    return fallback?.toLowerCase()
+  }
+
+  private extractVideoFileNameFromRow(row: Record<string, any>, content?: string): string | undefined {
+    const packedRaw = this.getRowField(row, [
+      'packed_info_data', 'packedInfoData',
+      'packed_info_blob', 'packedInfoBlob',
+      'packed_info', 'packedInfo',
+      'BytesExtra', 'bytes_extra',
+      'WCDB_CT_packed_info',
+      'reserved0', 'Reserved0', 'WCDB_CT_Reserved0'
+    ])
+    const byPacked = this.extractVideoFileNameFromPackedRaw(packedRaw)
+    if (byPacked) return byPacked
+
+    const byColumn = this.normalizeVideoFileToken(this.getRowField(row, [
+      'video_md5', 'videoMd5', 'raw_md5', 'rawMd5', 'video_file_name', 'videoFileName'
+    ]))
+    if (byColumn) return byColumn
+
+    return this.normalizeVideoFileToken(this.extractVideoMd5(content || ''))
+  }
+
   private resolveFileAttachmentRoots(): string[] {
     const dbPath = String(this.configService.get('dbPath') || '').trim()
     const rawWxid = String(this.configService.get('myWxid') || '').trim()
@@ -4567,7 +4648,7 @@ class ExportService {
             // 优先复用游标返回的字段，缺失时再回退到 XML 解析。
             imageMd5 = String(row.image_md5 || row.imageMd5 || '').trim() || undefined
             imageDatName = String(row.image_dat_name || row.imageDatName || '').trim() || undefined
-            videoMd5 = String(row.video_md5 || row.videoMd5 || '').trim() || undefined
+            videoMd5 = this.extractVideoFileNameFromRow(row, content)
 
             if (localType === 3 && content) {
               // 图片消息
@@ -4575,7 +4656,7 @@ class ExportService {
               imageDatName = imageDatName || this.extractImageDatName(content)
             } else if (localType === 43 && content) {
               // 视频消息
-              videoMd5 = videoMd5 || this.extractVideoMd5(content)
+              videoMd5 = videoMd5 || this.extractVideoFileNameFromRow(row, content)
             } else if (collectMode === 'full' && content && (localType === 49 || content.includes('<appmsg') || content.includes('&lt;appmsg'))) {
               // 检查是否是聊天记录消息（type=19），兼容大 localType 的 appmsg
               const normalizedContent = this.normalizeAppMessageContent(content)
@@ -4720,7 +4801,7 @@ class ExportService {
         }
 
         if (msg.localType === 43) {
-          const videoMd5 = String(row.video_md5 || row.videoMd5 || '').trim() || this.extractVideoMd5(content)
+          const videoMd5 = this.extractVideoFileNameFromRow(row, content)
           if (videoMd5) msg.videoMd5 = videoMd5
         }
       } catch (error) {
@@ -8941,12 +9022,14 @@ class ExportService {
     pendingSessionIds?: string[]
     successSessionIds?: string[]
     failedSessionIds?: string[]
+    sessionOutputPaths?: Record<string, string>
     error?: string
   }> {
     let successCount = 0
     let failCount = 0
     const successSessionIds: string[] = []
     const failedSessionIds: string[] = []
+    const sessionOutputPaths: Record<string, string> = {}
     const progressEmitter = this.createProgressEmitter(onProgress)
     let attachMediaTelemetry = false
     const emitProgress = (progress: ExportProgress, options?: { force?: boolean }) => {
@@ -9144,7 +9227,8 @@ class ExportService {
           stopped: true,
           pendingSessionIds: [...queue],
           successSessionIds,
-          failedSessionIds
+          failedSessionIds,
+          sessionOutputPaths
         }
       }
       if (pauseRequested) {
@@ -9155,7 +9239,8 @@ class ExportService {
           paused: true,
           pendingSessionIds: [...queue],
           successSessionIds,
-          failedSessionIds
+          failedSessionIds,
+          sessionOutputPaths
         }
       }
 
@@ -9266,6 +9351,7 @@ class ExportService {
             if (hasNoDataChange) {
               successCount++
               successSessionIds.push(sessionId)
+              sessionOutputPaths[sessionId] = preferredOutputPath
               activeSessionRatios.delete(sessionId)
               completedCount++
               emitProgress({
@@ -9311,6 +9397,7 @@ class ExportService {
           if (result.success) {
             successCount++
             successSessionIds.push(sessionId)
+            sessionOutputPaths[sessionId] = outputPath
             if (typeof messageCountHint === 'number' && messageCountHint >= 0) {
               exportRecordService.saveRecord(sessionId, effectiveOptions.format, messageCountHint, {
                 sourceLatestMessageTimestamp: typeof latestTimestampHint === 'number' && latestTimestampHint > 0
@@ -9401,7 +9488,8 @@ class ExportService {
           stopped: true,
           pendingSessionIds,
           successSessionIds,
-          failedSessionIds
+          failedSessionIds,
+          sessionOutputPaths
         }
       }
       if (pauseRequested && pendingSessionIds.length > 0) {
@@ -9412,7 +9500,8 @@ class ExportService {
           paused: true,
           pendingSessionIds,
           successSessionIds,
-          failedSessionIds
+          failedSessionIds,
+          sessionOutputPaths
         }
       }
 
@@ -9425,7 +9514,7 @@ class ExportService {
       }, { force: true })
       progressEmitter.flush()
 
-      return { success: true, successCount, failCount, successSessionIds, failedSessionIds }
+      return { success: true, successCount, failCount, successSessionIds, failedSessionIds, sessionOutputPaths }
     } catch (e) {
       progressEmitter.flush()
       return { success: false, successCount, failCount, error: String(e) }
diff --git a/electron/services/imageDecryptService.ts b/electron/services/imageDecryptService.ts
index 9f300c5..c552ea1 100644
--- a/electron/services/imageDecryptService.ts
+++ b/electron/services/imageDecryptService.ts
@@ -144,14 +144,14 @@ export class ImageDecryptService {
     for (const key of cacheKeys) {
       const cached = this.resolvedCache.get(key)
       if (cached && existsSync(cached) && this.isImageFile(cached)) {
-        const upgraded = this.isThumbnailPath(cached)
+        const upgraded = !this.isHdPath(cached)
           ? await this.tryPromoteThumbnailCache(payload, key, cached)
           : null
         const finalPath = upgraded || cached
         const localPath = this.resolveLocalPathForPayload(finalPath, payload.preferFilePath)
-        const isThumb = this.isThumbnailPath(finalPath)
-        const hasUpdate = isThumb ? (this.updateFlags.get(key) ?? false) : false
-        if (isThumb) {
+        const isNonHd = !this.isHdPath(finalPath)
+        const hasUpdate = isNonHd ? (this.updateFlags.get(key) ?? false) : false
+        if (isNonHd) {
           if (this.shouldCheckImageUpdate(payload)) {
             this.triggerUpdateCheck(payload, key, finalPath)
           }
@@ -184,15 +184,15 @@ export class ImageDecryptService {
       if (datPath) {
         const existing = this.findCachedOutputByDatPath(datPath, payload.sessionId, false)
         if (existing) {
-          const upgraded = this.isThumbnailPath(existing)
+          const upgraded = !this.isHdPath(existing)
             ? await this.tryPromoteThumbnailCache(payload, cacheKey, existing)
             : null
           const finalPath = upgraded || existing
           this.cacheResolvedPaths(cacheKey, payload.imageMd5, payload.imageDatName, finalPath)
           const localPath = this.resolveLocalPathForPayload(finalPath, payload.preferFilePath)
-          const isThumb = this.isThumbnailPath(finalPath)
-          const hasUpdate = isThumb ? (this.updateFlags.get(cacheKey) ?? false) : false
-          if (isThumb) {
+          const isNonHd = !this.isHdPath(finalPath)
+          const hasUpdate = isNonHd ? (this.updateFlags.get(cacheKey) ?? false) : false
+          if (isNonHd) {
             if (this.shouldCheckImageUpdate(payload)) {
               this.triggerUpdateCheck(payload, cacheKey, finalPath)
             }
@@ -219,7 +219,7 @@ export class ImageDecryptService {
     if (payload.force) {
       for (const key of cacheKeys) {
         const cached = this.resolvedCache.get(key)
-        if (cached && existsSync(cached) && this.isImageFile(cached) && !this.isThumbnailPath(cached)) {
+        if (cached && existsSync(cached) && this.isImageFile(cached) && this.isHdPath(cached)) {
           this.cacheResolvedPaths(cacheKey, payload.imageMd5, payload.imageDatName, cached)
           this.clearUpdateFlags(cacheKey, payload.imageMd5, payload.imageDatName)
           const localPath = this.resolveLocalPathForPayload(cached, payload.preferFilePath)
@@ -237,7 +237,7 @@ export class ImageDecryptService {
     if (!payload.force) {
       const cached = this.resolvedCache.get(cacheKey)
       if (cached && existsSync(cached) && this.isImageFile(cached)) {
-        const upgraded = this.isThumbnailPath(cached)
+        const upgraded = !this.isHdPath(cached)
           ? await this.tryPromoteThumbnailCache(payload, cacheKey, cached)
           : null
         const finalPath = upgraded || cached
@@ -280,22 +280,13 @@ export class ImageDecryptService {
     if (!accountDir) return
 
     try {
-      const ready = await this.ensureWcdbReady()
-      if (!ready) return
-      const requests = normalizedList.map((md5) => ({ md5, accountDir }))
-      const result = await wcdbService.resolveImageHardlinkBatch(requests)
-      if (!result.success || !Array.isArray(result.rows)) return
-
-      for (const row of result.rows) {
-        const md5 = String(row?.md5 || '').trim().toLowerCase()
-        if (!md5) continue
-        const fileName = String(row?.data?.file_name || '').trim().toLowerCase()
-        const fullPath = String(row?.data?.full_path || '').trim()
-        if (!fileName || !fullPath) continue
-        const selectedPath = this.normalizeHardlinkDatPathByFileName(fullPath, fileName)
-        if (!selectedPath || !existsSync(selectedPath)) continue
+      for (const md5 of normalizedList) {
+        if (!this.looksLikeMd5(md5)) continue
+        const selectedPath = this.selectBestDatPathByBase(accountDir, md5, undefined, undefined, true)
+        if (!selectedPath) continue
         this.cacheDatPath(accountDir, md5, selectedPath)
-        this.cacheDatPath(accountDir, fileName, selectedPath)
+        const fileName = basename(selectedPath).toLowerCase()
+        if (fileName) this.cacheDatPath(accountDir, fileName, selectedPath)
       }
     } catch {
       // ignore preload failures
@@ -477,8 +468,10 @@ export class ImageDecryptService {
       this.logInfo('解密成功', { outputPath, size: decrypted.length })
 
       const isThumb = this.isThumbnailPath(datPath)
+      const isHdCache = this.isHdPath(outputPath)
+      this.removeDuplicateCacheCandidates(datPath, payload.sessionId, outputPath)
       this.cacheResolvedPaths(cacheKey, payload.imageMd5, payload.imageDatName, outputPath)
-      if (!isThumb) {
+      if (isHdCache) {
         this.clearUpdateFlags(cacheKey, payload.imageMd5, payload.imageDatName)
       } else {
         if (this.shouldCheckImageUpdate(payload)) {
@@ -625,95 +618,49 @@ export class ImageDecryptService {
       allowDatNameScanFallback
     })
 
-    const lookupMd5s = this.collectHardlinkLookupMd5s(imageMd5, imageDatName)
-    const fallbackDatName = String(imageDatName || imageMd5 || '').trim().toLowerCase() || undefined
-    if (lookupMd5s.length === 0) {
-      if (!allowDatNameScanFallback) {
-        this.logInfo('[ImageDecrypt] resolveDatPath skip datName scan (no hardlink md5)', {
-          imageMd5,
-          imageDatName,
-          sessionId,
-          createTime
-        })
-        return null
-      }
-      const packedDatFallback = this.resolveDatPathFromParsedDatName(accountDir, fallbackDatName, sessionId, createTime, allowThumbnail)
-      if (packedDatFallback) {
-        if (imageMd5) this.cacheDatPath(accountDir, imageMd5, packedDatFallback)
-        if (imageDatName) this.cacheDatPath(accountDir, imageDatName, packedDatFallback)
-        const normalizedFileName = basename(packedDatFallback).toLowerCase()
-        if (normalizedFileName) this.cacheDatPath(accountDir, normalizedFileName, packedDatFallback)
-        this.logInfo('[ImageDecrypt] datName fallback hit (no hardlink md5)', {
-          imageMd5,
-          imageDatName,
-          selectedPath: packedDatFallback
-        })
-        return packedDatFallback
-      }
-      this.logInfo('[ImageDecrypt] resolveDatPath miss (no hardlink md5)', { imageMd5, imageDatName })
+    const lookupBases = this.collectLookupBasesForScan(imageMd5, imageDatName, allowDatNameScanFallback)
+    if (lookupBases.length === 0) {
+      this.logInfo('[ImageDecrypt] resolveDatPath miss (no lookup base)', { imageMd5, imageDatName })
       return null
     }
 
     if (!skipResolvedCache) {
       const cacheCandidates = Array.from(new Set([
-        ...lookupMd5s,
+        ...lookupBases,
         String(imageMd5 || '').trim().toLowerCase(),
         String(imageDatName || '').trim().toLowerCase()
       ].filter(Boolean)))
       for (const cacheKey of cacheCandidates) {
         const scopedKey = `${accountDir}|${cacheKey}`
         const cached = this.resolvedCache.get(scopedKey)
-        if (!cached) continue
-        if (!existsSync(cached)) continue
-        if (!allowThumbnail && this.isThumbnailPath(cached)) continue
+        if (!cached || !existsSync(cached)) continue
+        if (!allowThumbnail && !this.isHdDatPath(cached)) continue
         return cached
       }
     }
 
-    for (const lookupMd5 of lookupMd5s) {
-      this.logInfo('[ImageDecrypt] hardlink lookup', { lookupMd5, sessionId, hardlinkOnly })
-      const hardlinkPath = await this.resolveHardlinkPath(accountDir, lookupMd5, sessionId)
-      if (!hardlinkPath) continue
-      if (!allowThumbnail && this.isThumbnailPath(hardlinkPath)) continue
+    for (const baseMd5 of lookupBases) {
+      const selectedPath = this.selectBestDatPathByBase(accountDir, baseMd5, sessionId, createTime, allowThumbnail)
+      if (!selectedPath) continue
 
-      this.cacheDatPath(accountDir, lookupMd5, hardlinkPath)
-      if (imageMd5) this.cacheDatPath(accountDir, imageMd5, hardlinkPath)
-      if (imageDatName) this.cacheDatPath(accountDir, imageDatName, hardlinkPath)
-      const normalizedFileName = basename(hardlinkPath).toLowerCase()
-      if (normalizedFileName) this.cacheDatPath(accountDir, normalizedFileName, hardlinkPath)
-      return hardlinkPath
-    }
-
-    if (!allowDatNameScanFallback) {
-      this.logInfo('[ImageDecrypt] resolveDatPath skip datName fallback after hardlink miss', {
-        imageMd5,
-        imageDatName,
-        sessionId,
-        createTime,
-        lookupMd5s
+      this.cacheDatPath(accountDir, baseMd5, selectedPath)
+      if (imageMd5) this.cacheDatPath(accountDir, imageMd5, selectedPath)
+      if (imageDatName) this.cacheDatPath(accountDir, imageDatName, selectedPath)
+      const normalizedFileName = basename(selectedPath).toLowerCase()
+      if (normalizedFileName) this.cacheDatPath(accountDir, normalizedFileName, selectedPath)
+      this.logInfo('[ImageDecrypt] dat scan selected', {
+        baseMd5,
+        selectedPath,
+        allowThumbnail
       })
-      return null
+      return selectedPath
     }
 
-    const packedDatFallback = this.resolveDatPathFromParsedDatName(accountDir, fallbackDatName, sessionId, createTime, allowThumbnail)
-    if (packedDatFallback) {
-      if (imageMd5) this.cacheDatPath(accountDir, imageMd5, packedDatFallback)
-      if (imageDatName) this.cacheDatPath(accountDir, imageDatName, packedDatFallback)
-      const normalizedFileName = basename(packedDatFallback).toLowerCase()
-      if (normalizedFileName) this.cacheDatPath(accountDir, normalizedFileName, packedDatFallback)
-      this.logInfo('[ImageDecrypt] datName fallback hit (hardlink miss)', {
-        imageMd5,
-        imageDatName,
-        lookupMd5s,
-        selectedPath: packedDatFallback
-      })
-      return packedDatFallback
-    }
-
-    this.logInfo('[ImageDecrypt] resolveDatPath miss (hardlink + datName fallback)', {
+    this.logInfo('[ImageDecrypt] resolveDatPath miss (dat scan)', {
       imageMd5,
       imageDatName,
-      lookupMd5s
+      lookupBases,
+      allowThumbnail
     })
     return null
   }
@@ -724,23 +671,46 @@ export class ImageDecryptService {
     cachedPath: string
   ): Promise<boolean> {
     if (!cachedPath || !existsSync(cachedPath)) return false
-    const isThumbnail = this.isThumbnailPath(cachedPath)
-    if (!isThumbnail) return false
+    if (this.isHdPath(cachedPath)) return false
     const wxid = this.configService.get('myWxid')
     const dbPath = this.configService.get('dbPath')
     if (!wxid || !dbPath) return false
     const accountDir = this.resolveAccountDir(dbPath, wxid)
     if (!accountDir) return false
 
-    const hdPath = await this.resolveDatPath(
-      accountDir,
-      payload.imageMd5,
-      payload.imageDatName,
-      payload.sessionId,
-      payload.createTime,
-      { allowThumbnail: false, skipResolvedCache: true, hardlinkOnly: true, allowDatNameScanFallback: false }
-    )
-    return Boolean(hdPath)
+    const lookupBases = this.collectLookupBasesForScan(payload.imageMd5, payload.imageDatName, true)
+    if (lookupBases.length === 0) return false
+
+    let currentTier = this.getCachedPathTier(cachedPath)
+    let bestDatPath: string | null = null
+    let bestDatTier = -1
+    for (const baseMd5 of lookupBases) {
+      const candidate = this.selectBestDatPathByBase(accountDir, baseMd5, payload.sessionId, payload.createTime, true)
+      if (!candidate) continue
+      const candidateTier = this.getDatTier(candidate, baseMd5)
+      if (candidateTier <= 0) continue
+      if (!bestDatPath) {
+        bestDatPath = candidate
+        bestDatTier = candidateTier
+        continue
+      }
+      if (candidateTier > bestDatTier) {
+        bestDatPath = candidate
+        bestDatTier = candidateTier
+        continue
+      }
+      if (candidateTier === bestDatTier) {
+        const candidateSize = this.fileSizeSafe(candidate)
+        const bestSize = this.fileSizeSafe(bestDatPath)
+        if (candidateSize > bestSize) {
+          bestDatPath = candidate
+          bestDatTier = candidateTier
+        }
+      }
+    }
+    if (!bestDatPath || bestDatTier <= 0) return false
+    if (currentTier < 0) currentTier = 1
+    return bestDatTier > currentTier
   }
 
   private async tryPromoteThumbnailCache(
@@ -750,7 +720,7 @@ export class ImageDecryptService {
   ): Promise<string | null> {
     if (!cachedPath || !existsSync(cachedPath)) return null
     if (!this.isImageFile(cachedPath)) return null
-    if (!this.isThumbnailPath(cachedPath)) return null
+    if (this.isHdPath(cachedPath)) return null
 
     const accountDir = this.resolveCurrentAccountDir()
     if (!accountDir) return null
@@ -766,7 +736,7 @@ export class ImageDecryptService {
     if (!hdDatPath) return null
 
     const existingHd = this.findCachedOutputByDatPath(hdDatPath, payload.sessionId, true)
-    if (existingHd && existsSync(existingHd) && this.isImageFile(existingHd) && !this.isThumbnailPath(existingHd)) {
+    if (existingHd && existsSync(existingHd) && this.isImageFile(existingHd) && this.isHdPath(existingHd)) {
       this.cacheResolvedPaths(cacheKey, payload.imageMd5, payload.imageDatName, existingHd)
       this.clearUpdateFlags(cacheKey, payload.imageMd5, payload.imageDatName)
       this.removeThumbnailCacheFile(cachedPath, existingHd)
@@ -796,7 +766,7 @@ export class ImageDecryptService {
       ? cachedResult
       : String(upgraded.localPath || '').trim()
     if (!upgradedPath || !existsSync(upgradedPath)) return null
-    if (!this.isImageFile(upgradedPath) || this.isThumbnailPath(upgradedPath)) return null
+    if (!this.isImageFile(upgradedPath) || !this.isHdPath(upgradedPath)) return null
 
     this.cacheResolvedPaths(cacheKey, payload.imageMd5, payload.imageDatName, upgradedPath)
     this.clearUpdateFlags(cacheKey, payload.imageMd5, payload.imageDatName)
@@ -814,24 +784,73 @@ export class ImageDecryptService {
     if (!oldPath) return
     if (keepPath && oldPath === keepPath) return
     if (!existsSync(oldPath)) return
-    if (!this.isThumbnailPath(oldPath)) return
+    if (this.isHdPath(oldPath)) return
     void rm(oldPath, { force: true }).catch(() => { })
   }
 
   private triggerUpdateCheck(
-    payload: { sessionId?: string; imageMd5?: string; imageDatName?: string; createTime?: number; disableUpdateCheck?: boolean; suppressEvents?: boolean },
+    payload: {
+      sessionId?: string
+      imageMd5?: string
+      imageDatName?: string
+      createTime?: number
+      preferFilePath?: boolean
+      disableUpdateCheck?: boolean
+      suppressEvents?: boolean
+    },
     cacheKey: string,
     cachedPath: string
   ): void {
     if (!this.shouldCheckImageUpdate(payload)) return
     if (this.updateFlags.get(cacheKey)) return
-    void this.checkHasUpdate(payload, cacheKey, cachedPath).then((hasUpdate) => {
+    void this.checkHasUpdate(payload, cacheKey, cachedPath).then(async (hasUpdate) => {
       if (!hasUpdate) return
       this.updateFlags.set(cacheKey, true)
+      const upgradedPath = await this.tryAutoRefreshBetterCache(payload, cacheKey, cachedPath)
+      if (upgradedPath) {
+        this.updateFlags.delete(cacheKey)
+        this.emitCacheResolved(payload, cacheKey, this.resolveEmitPath(upgradedPath, payload.preferFilePath))
+        return
+      }
       this.emitImageUpdate(payload, cacheKey)
     }).catch(() => { })
   }
 
+  private async tryAutoRefreshBetterCache(
+    payload: {
+      sessionId?: string
+      imageMd5?: string
+      imageDatName?: string
+      createTime?: number
+      preferFilePath?: boolean
+      disableUpdateCheck?: boolean
+      suppressEvents?: boolean
+    },
+    cacheKey: string,
+    cachedPath: string
+  ): Promise<string | null> {
+    if (!cachedPath || !existsSync(cachedPath)) return null
+    if (this.isHdPath(cachedPath)) return null
+    const refreshed = await this.decryptImage({
+      sessionId: payload.sessionId,
+      imageMd5: payload.imageMd5,
+      imageDatName: payload.imageDatName,
+      createTime: payload.createTime,
+      preferFilePath: true,
+      force: true,
+      hardlinkOnly: true,
+      disableUpdateCheck: true,
+      suppressEvents: true
+    })
+    if (!refreshed.success || !refreshed.localPath) return null
+    const refreshedPath = String(refreshed.localPath || '').trim()
+    if (!refreshedPath || !existsSync(refreshedPath)) return null
+    if (!this.isImageFile(refreshedPath)) return null
+    this.cacheResolvedPaths(cacheKey, payload.imageMd5, payload.imageDatName, refreshedPath)
+    this.removeThumbnailCacheFile(cachedPath, refreshedPath)
+    return refreshedPath
+  }
+
 
 
   private collectHardlinkLookupMd5s(imageMd5?: string, imageDatName?: string): string[] {
@@ -854,6 +873,111 @@ export class ImageDecryptService {
     return keys
   }
 
+  private collectLookupBasesForScan(imageMd5?: string, imageDatName?: string, allowDatNameScanFallback = true): string[] {
+    const bases = this.collectHardlinkLookupMd5s(imageMd5, imageDatName)
+    if (!allowDatNameScanFallback) return bases
+    const fallbackRaw = String(imageDatName || imageMd5 || '').trim().toLowerCase()
+    if (!fallbackRaw) return bases
+    const fallbackNoExt = fallbackRaw.endsWith('.dat') ? fallbackRaw.slice(0, -4) : fallbackRaw
+    const fallbackBase = this.normalizeDatBase(fallbackNoExt)
+    if (this.looksLikeMd5(fallbackBase) && !bases.includes(fallbackBase)) {
+      bases.push(fallbackBase)
+    }
+    return bases
+  }
+
+  private collectAllDatCandidatesForBase(
+    accountDir: string,
+    baseMd5: string,
+    sessionId?: string,
+    createTime?: number
+  ): string[] {
+    const sessionMonth = this.collectDatCandidatesFromSessionMonth(accountDir, baseMd5, sessionId, createTime)
+    return Array.from(new Set(sessionMonth.filter((item) => {
+      const path = String(item || '').trim()
+      return path && existsSync(path) && path.toLowerCase().endsWith('.dat')
+    })))
+  }
+
+  private isImgScopedDatPath(filePath: string): boolean {
+    const lower = String(filePath || '').toLowerCase()
+    return /[\\/](img|image|msgimg)[\\/]/.test(lower)
+  }
+
+  private fileSizeSafe(filePath: string): number {
+    try {
+      return statSync(filePath).size || 0
+    } catch {
+      return 0
+    }
+  }
+
+  private fileMtimeSafe(filePath: string): number {
+    try {
+      return statSync(filePath).mtimeMs || 0
+    } catch {
+      return 0
+    }
+  }
+
+  private pickLargestDatPath(paths: string[]): string | null {
+    const list = Array.from(new Set(paths.filter(Boolean)))
+    if (list.length === 0) return null
+    list.sort((a, b) => {
+      const sizeDiff = this.fileSizeSafe(b) - this.fileSizeSafe(a)
+      if (sizeDiff !== 0) return sizeDiff
+      const mtimeDiff = this.fileMtimeSafe(b) - this.fileMtimeSafe(a)
+      if (mtimeDiff !== 0) return mtimeDiff
+      return a.localeCompare(b)
+    })
+    return list[0] || null
+  }
+
+  private selectBestDatPathByBase(
+    accountDir: string,
+    baseMd5: string,
+    sessionId?: string,
+    createTime?: number,
+    allowThumbnail = true
+  ): string | null {
+    const candidates = this.collectAllDatCandidatesForBase(accountDir, baseMd5, sessionId, createTime)
+    if (candidates.length === 0) return null
+
+    const imgCandidates = candidates.filter((item) => this.isImgScopedDatPath(item))
+    const imgHdCandidates = imgCandidates.filter((item) => this.isHdDatPath(item))
+    const hdInImg = this.pickLargestDatPath(imgHdCandidates)
+    if (hdInImg) return hdInImg
+
+    if (!allowThumbnail) {
+      // 高清优先仅认 img/image/msgimg 路径中的 H 变体；
+      // 若该范围没有，则交由 allowThumbnail=true 的回退分支按 base.dat/_t 继续挑选。
+      return null
+    }
+
+    // 无 H 时，优先尝试原始无后缀 DAT（{md5}.dat）。
+    const baseDatInImg = this.pickLargestDatPath(
+      imgCandidates.filter((item) => this.isBaseDatPath(item, baseMd5))
+    )
+    if (baseDatInImg) return baseDatInImg
+
+    const baseDatAny = this.pickLargestDatPath(
+      candidates.filter((item) => this.isBaseDatPath(item, baseMd5))
+    )
+    if (baseDatAny) return baseDatAny
+
+    const thumbDatInImg = this.pickLargestDatPath(
+      imgCandidates.filter((item) => this.isTVariantDat(item))
+    )
+    if (thumbDatInImg) return thumbDatInImg
+
+    const thumbDatAny = this.pickLargestDatPath(
+      candidates.filter((item) => this.isTVariantDat(item))
+    )
+    if (thumbDatAny) return thumbDatAny
+
+    return null
+  }
+
   private resolveDatPathFromParsedDatName(
     accountDir: string,
     imageDatName?: string,
@@ -878,7 +1002,7 @@ export class ImageDecryptService {
     if (sessionMonthCandidates.length > 0) {
       const orderedSessionMonth = this.sortDatCandidatePaths(sessionMonthCandidates, baseMd5)
       for (const candidatePath of orderedSessionMonth) {
-        if (!allowThumbnail && this.isThumbnailPath(candidatePath)) continue
+        if (!allowThumbnail && !this.isHdDatPath(candidatePath)) continue
         this.datNameScanMissAt.delete(missKey)
         this.logInfo('[ImageDecrypt] datName fallback selected (session-month)', {
           accountDir,
@@ -894,54 +1018,17 @@ export class ImageDecryptService {
       }
     }
 
-    const hasPreciseContext = Boolean(String(sessionId || '').trim() && monthKey)
-    if (hasPreciseContext) {
-      this.datNameScanMissAt.set(missKey, Date.now())
-      this.logInfo('[ImageDecrypt] datName fallback precise scan miss', {
-        accountDir,
-        sessionId,
-        imageDatName: datNameRaw,
-        createTime,
-        monthKey,
-        baseMd5,
-        allowThumbnail
-      })
-      return null
-    }
-
-    const candidates = this.collectDatCandidatesFromAccountDir(accountDir, baseMd5)
-    if (candidates.length === 0) {
-      this.datNameScanMissAt.set(missKey, Date.now())
-      this.logInfo('[ImageDecrypt] datName fallback scan miss', {
-        accountDir,
-        sessionId,
-        imageDatName: datNameRaw,
-        createTime,
-        monthKey,
-        baseMd5,
-        allowThumbnail
-      })
-      return null
-    }
-
-    const ordered = this.sortDatCandidatePaths(candidates, baseMd5)
-    for (const candidatePath of ordered) {
-      if (!allowThumbnail && this.isThumbnailPath(candidatePath)) continue
-      this.datNameScanMissAt.delete(missKey)
-      this.logInfo('[ImageDecrypt] datName fallback selected', {
-        accountDir,
-        sessionId,
-        imageDatName: datNameRaw,
-        createTime,
-        monthKey,
-        baseMd5,
-        allowThumbnail,
-        selectedPath: candidatePath
-      })
-      return candidatePath
-    }
-
+    // 新策略：只扫描会话月目录，不做 account-wide 根目录回退。
     this.datNameScanMissAt.set(missKey, Date.now())
+    this.logInfo('[ImageDecrypt] datName fallback precise scan miss', {
+      accountDir,
+      sessionId,
+      imageDatName: datNameRaw,
+      createTime,
+      monthKey,
+      baseMd5,
+      allowThumbnail
+    })
     return null
   }
 
@@ -966,27 +1053,14 @@ export class ImageDecryptService {
     const monthKey = this.resolveYearMonthFromCreateTime(createTime)
     if (!normalizedSessionId || !monthKey) return []
 
-    const attachRoots = this.getAttachScanRoots(accountDir)
-    const cacheRoots = this.getMessageCacheScanRoots(accountDir)
-    const sessionDirs = this.getAttachSessionDirCandidates(normalizedSessionId)
+    const sessionDir = this.resolveSessionDirForStorage(normalizedSessionId)
+    if (!sessionDir) return []
     const candidates = new Set<string>()
-    const budget = { remaining: 600 }
-    const targetDirs: Array<{ dir: string; depth: number }> = []
-
-    for (const root of attachRoots) {
-      for (const sessionDir of sessionDirs) {
-        targetDirs.push({ dir: join(root, sessionDir, monthKey), depth: 2 })
-        targetDirs.push({ dir: join(root, sessionDir, monthKey, 'Img'), depth: 1 })
-        targetDirs.push({ dir: join(root, sessionDir, monthKey, 'Image'), depth: 1 })
-      }
-    }
-
-    for (const root of cacheRoots) {
-      for (const sessionDir of sessionDirs) {
-        targetDirs.push({ dir: join(root, monthKey, 'Message', sessionDir, 'Bubble'), depth: 1 })
-        targetDirs.push({ dir: join(root, monthKey, 'Message', sessionDir), depth: 2 })
-      }
-    }
+    const budget = { remaining: 240 }
+    const targetDirs: Array<{ dir: string; depth: number }> = [
+      // 1) accountDir/msg/attach/{sessionMd5}/{yyyy-MM}/Img
+      { dir: join(accountDir, 'msg', 'attach', sessionDir, monthKey, 'Img'), depth: 1 }
+    ]
 
     for (const target of targetDirs) {
       if (budget.remaining <= 0) break
@@ -996,98 +1070,13 @@ export class ImageDecryptService {
     return Array.from(candidates)
   }
 
-  private getAttachScanRoots(accountDir: string): string[] {
-    const roots: string[] = []
-    const push = (value: string) => {
-      const normalized = String(value || '').trim()
-      if (!normalized) return
-      if (!roots.includes(normalized)) roots.push(normalized)
-    }
-
-    push(join(accountDir, 'msg', 'attach'))
-    push(join(accountDir, 'attach'))
-    const parent = dirname(accountDir)
-    if (parent && parent !== accountDir) {
-      push(join(parent, 'msg', 'attach'))
-      push(join(parent, 'attach'))
-    }
-    return roots
-  }
-
-  private getMessageCacheScanRoots(accountDir: string): string[] {
-    const roots: string[] = []
-    const push = (value: string) => {
-      const normalized = String(value || '').trim()
-      if (!normalized) return
-      if (!roots.includes(normalized)) roots.push(normalized)
-    }
-
-    push(join(accountDir, 'cache'))
-    const parent = dirname(accountDir)
-    if (parent && parent !== accountDir) {
-      push(join(parent, 'cache'))
-    }
-    return roots
-  }
-
-  private getAttachSessionDirCandidates(sessionId: string): string[] {
-    const normalized = String(sessionId || '').trim()
-    if (!normalized) return []
-    const lower = normalized.toLowerCase()
-    const cleaned = this.cleanAccountDirName(normalized)
-    const inputs = Array.from(new Set([normalized, lower, cleaned, cleaned.toLowerCase()].filter(Boolean)))
-    const results: string[] = []
-    const push = (value: string) => {
-      if (!value) return
-      if (!results.includes(value)) results.push(value)
-    }
-
-    for (const item of inputs) {
-      push(item)
-      const md5 = crypto.createHash('md5').update(item).digest('hex').toLowerCase()
-      push(md5)
-      push(md5.slice(0, 16))
-    }
-    return results
-  }
-
-  private collectDatCandidatesFromAccountDir(accountDir: string, baseMd5: string): string[] {
-    const roots = this.getDatScanRoots(accountDir)
-    const candidates = new Set<string>()
-    const budget = { remaining: 1400 }
-
-    for (const item of roots) {
-      if (budget.remaining <= 0) break
-      this.scanDatCandidatesUnderRoot(item.root, baseMd5, item.maxDepth, candidates, budget)
-    }
-
-    if (candidates.size === 0 && budget.remaining <= 0) {
-      this.logInfo('[ImageDecrypt] datName fallback budget exhausted', {
-        accountDir,
-        baseMd5,
-        roots: roots.map((item) => item.root)
-      })
-    }
-
-    return Array.from(candidates)
-  }
-
-  private getDatScanRoots(accountDir: string): Array<{ root: string; maxDepth: number }> {
-    const roots: Array<{ root: string; maxDepth: number }> = []
-    const push = (root: string, maxDepth: number) => {
-      const normalized = String(root || '').trim()
-      if (!normalized) return
-      if (roots.some((item) => item.root === normalized)) return
-      roots.push({ root: normalized, maxDepth })
-    }
-
-    push(join(accountDir, 'attach'), 4)
-    push(join(accountDir, 'msg', 'attach'), 4)
-    push(join(accountDir, 'FileStorage', 'Image'), 3)
-    push(join(accountDir, 'FileStorage', 'Image2'), 3)
-    push(join(accountDir, 'FileStorage', 'MsgImg'), 3)
-
-    return roots
+  private resolveSessionDirForStorage(sessionId: string): string {
+    const normalized = String(sessionId || '').trim().toLowerCase()
+    if (!normalized) return ''
+    if (this.looksLikeMd5(normalized)) return normalized
+    const cleaned = this.cleanAccountDirName(normalized).toLowerCase()
+    if (this.looksLikeMd5(cleaned)) return cleaned
+    return crypto.createHash('md5').update(cleaned || normalized).digest('hex').toLowerCase()
   }
 
   private scanDatCandidatesUnderRoot(
@@ -1296,17 +1285,60 @@ export class ImageDecryptService {
     }
   }
 
+  private getCacheVariantSuffixFromDat(datPath: string): string {
+    if (this.isHdDatPath(datPath)) return '_hd'
+    const name = basename(datPath)
+    const lower = name.toLowerCase()
+    const stem = lower.endsWith('.dat') ? lower.slice(0, -4) : lower
+    const base = this.normalizeDatBase(stem)
+    const rawSuffix = stem.slice(base.length)
+    if (!rawSuffix) return ''
+    const safe = rawSuffix.replace(/[^a-z0-9._-]/g, '')
+    if (!safe) return ''
+    if (safe.startsWith('_') || safe.startsWith('.')) return safe
+    return `_${safe}`
+  }
+
+  private getCacheVariantSuffixFromCachedPath(cachePath: string): string {
+    const raw = String(cachePath || '').split('?')[0]
+    const name = basename(raw)
+    const ext = extname(name).toLowerCase()
+    const stem = (ext ? name.slice(0, -ext.length) : name).toLowerCase()
+    const base = this.normalizeDatBase(stem)
+    const rawSuffix = stem.slice(base.length)
+    if (!rawSuffix) return ''
+    const safe = rawSuffix.replace(/[^a-z0-9._-]/g, '')
+    if (!safe) return ''
+    if (safe.startsWith('_') || safe.startsWith('.')) return safe
+    return `_${safe}`
+  }
+
+  private buildCacheSuffixSearchOrder(primarySuffix: string, preferHd: boolean): string[] {
+    const fallbackSuffixes = [
+      '_hd',
+      '_thumb',
+      '_t',
+      '.t',
+      '_b',
+      '.b',
+      '_w',
+      '.w',
+      '_c',
+      '.c',
+      ''
+    ]
+    const ordered = preferHd
+      ? ['_hd', primarySuffix, ...fallbackSuffixes]
+      : [primarySuffix, '_hd', ...fallbackSuffixes]
+    return Array.from(new Set(ordered.map((item) => String(item || '').trim()).filter((item) => item.length >= 0)))
+  }
+
   private getCacheOutputPathFromDat(datPath: string, ext: string, sessionId?: string): string {
     const name = basename(datPath)
     const lower = name.toLowerCase()
-    const base = lower.endsWith('.dat') ? name.slice(0, -4) : name
-
-    // 提取基础名称（去掉 _t, _h 等后缀）
+    const base = lower.endsWith('.dat') ? lower.slice(0, -4) : lower
     const normalizedBase = this.normalizeDatBase(base)
-
-    // 判断是缩略图还是高清图
-    const isThumb = this.isThumbnailDat(lower)
-    const suffix = isThumb ? '_thumb' : '_hd'
+    const suffix = this.getCacheVariantSuffixFromDat(datPath)
 
     const contactDir = this.sanitizeDirName(sessionId || 'unknown')
     const timeDir = this.resolveTimeDir(datPath)
@@ -1319,9 +1351,10 @@ export class ImageDecryptService {
   private buildCacheOutputCandidatesFromDat(datPath: string, sessionId?: string, preferHd = false): string[] {
     const name = basename(datPath)
     const lower = name.toLowerCase()
-    const base = lower.endsWith('.dat') ? name.slice(0, -4) : name
+    const base = lower.endsWith('.dat') ? lower.slice(0, -4) : lower
     const normalizedBase = this.normalizeDatBase(base)
-    const suffixes = preferHd ? ['_hd', '_thumb'] : ['_thumb', '_hd']
+    const primarySuffix = this.getCacheVariantSuffixFromDat(datPath)
+    const suffixes = this.buildCacheSuffixSearchOrder(primarySuffix, preferHd)
     const extensions = ['.jpg', '.jpeg', '.png', '.gif', '.webp']
 
     const root = this.getCacheRoot()
@@ -1354,6 +1387,20 @@ export class ImageDecryptService {
     return candidates
   }
 
+  private removeDuplicateCacheCandidates(datPath: string, sessionId: string | undefined, keepPath: string): void {
+    const candidateSets = [
+      ...this.buildCacheOutputCandidatesFromDat(datPath, sessionId, false),
+      ...this.buildCacheOutputCandidatesFromDat(datPath, sessionId, true)
+    ]
+    const candidates = Array.from(new Set(candidateSets))
+    for (const candidate of candidates) {
+      if (!candidate || candidate === keepPath) continue
+      if (!existsSync(candidate)) continue
+      if (!this.isImageFile(candidate)) continue
+      void rm(candidate, { force: true }).catch(() => { })
+    }
+  }
+
   private findCachedOutputByDatPath(datPath: string, sessionId?: string, preferHd = false): string | null {
     const candidates = this.buildCacheOutputCandidatesFromDat(datPath, sessionId, preferHd)
     for (const candidate of candidates) {
@@ -1786,8 +1833,54 @@ export class ImageDecryptService {
     return lower.includes('_t.dat') || lower.includes('.t.dat') || lower.includes('_thumb.dat')
   }
 
+  private isHdDatPath(datPath: string): boolean {
+    const name = basename(String(datPath || '')).toLowerCase()
+    if (!name.endsWith('.dat')) return false
+    const stem = name.slice(0, -4)
+    return (
+      stem.endsWith('_h') ||
+      stem.endsWith('.h') ||
+      stem.endsWith('_hd') ||
+      stem.endsWith('.hd')
+    )
+  }
+
+  private isTVariantDat(datPath: string): boolean {
+    const name = basename(String(datPath || '')).toLowerCase()
+    return this.isThumbnailDat(name)
+  }
+
+  private isBaseDatPath(datPath: string, baseMd5: string): boolean {
+    const normalizedBase = String(baseMd5 || '').trim().toLowerCase()
+    if (!normalizedBase) return false
+    const name = basename(String(datPath || '')).toLowerCase()
+    return name === `${normalizedBase}.dat`
+  }
+
+  private getDatTier(datPath: string, baseMd5: string): number {
+    if (this.isHdDatPath(datPath)) return 3
+    if (this.isBaseDatPath(datPath, baseMd5)) return 2
+    if (this.isTVariantDat(datPath)) return 1
+    return 0
+  }
+
+  private getCachedPathTier(cachePath: string): number {
+    if (this.isHdPath(cachePath)) return 3
+    const suffix = this.getCacheVariantSuffixFromCachedPath(cachePath)
+    if (!suffix) return 2
+    const normalized = suffix.toLowerCase()
+    if (normalized === '_t' || normalized === '.t' || normalized === '_thumb' || normalized === '.thumb') {
+      return 1
+    }
+    return 1
+  }
+
   private isHdPath(p: string): boolean {
-    return p.toLowerCase().includes('_hd') || p.toLowerCase().includes('_h')
+    const raw = String(p || '').split('?')[0]
+    const name = basename(raw).toLowerCase()
+    const ext = extname(name).toLowerCase()
+    const stem = ext ? name.slice(0, -ext.length) : name
+    return stem.endsWith('_hd')
   }
 
   private isThumbnailPath(p: string): boolean {
diff --git a/electron/services/insightService.ts b/electron/services/insightService.ts
index 6b5ecfa..f1ee5b4 100644
--- a/electron/services/insightService.ts
+++ b/electron/services/insightService.ts
@@ -175,6 +175,21 @@ function formatTimestamp(ts: number): string {
   return new Date(ts).toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' })
 }
 
+function formatPromptCurrentTime(date: Date = new Date()): string {
+  const year = date.getFullYear()
+  const month = String(date.getMonth() + 1).padStart(2, '0')
+  const day = String(date.getDate()).padStart(2, '0')
+  const hours = String(date.getHours()).padStart(2, '0')
+  const minutes = String(date.getMinutes()).padStart(2, '0')
+  return `当前系统时间：${year}年${month}月${day}日 ${hours}:${minutes}`
+}
+
+function appendPromptCurrentTime(prompt: string): string {
+  const base = String(prompt || '').trimEnd()
+  if (!base) return formatPromptCurrentTime()
+  return `${base}\n\n${formatPromptCurrentTime()}`
+}
+
 function normalizeApiMaxTokens(value: unknown): number {
   const numeric = Number(value)
   if (!Number.isFinite(numeric)) return API_MAX_TOKENS_DEFAULT
@@ -421,7 +436,7 @@ class InsightService {
 
     try {
       const endpoint = buildApiUrl(apiBaseUrl, '/chat/completions')
-      const requestMessages = [{ role: 'user', content: '请回复"连接成功"四个字。' }]
+      const requestMessages = [{ role: 'user', content: appendPromptCurrentTime('请回复"连接成功"四个字。') }]
       insightDebugSection(
         'INFO',
         'AI 测试连接请求',
@@ -568,7 +583,7 @@ class InsightService {
     const customPrompt = String(this.config.get('aiFootprintSystemPrompt') || '').trim()
     const systemPrompt = customPrompt || defaultSystemPrompt
 
-    const userPrompt = `统计范围：${rangeLabel}
+    const userPromptBase = `统计范围：${rangeLabel}
 有聊天的人数：${Number(summary.private_inbound_people) || 0}
 我有回复的人数：${Number(summary.private_outbound_people) || 0}
 回复率：${(((Number(summary.private_reply_rate) || 0) * 100)).toFixed(1)}%
@@ -582,6 +597,7 @@ ${topPrivateText}
 ${topMentionText}
 
 请给出足迹复盘（2-3句，含建议）：`
+    const userPrompt = appendPromptCurrentTime(userPromptBase)
 
     try {
       const result = await callApi(
@@ -1126,7 +1142,7 @@ ${topMentionText}
 
     const globalStatsDesc = `今天全部联系人合计已触发 ${totalTodayTriggers} 条见解。`
 
-    const userPrompt = [
+    const userPromptBase = [
       `触发原因：${triggerDesc}`,
       `时间统计：${todayStatsDesc}`,
       `全局统计：${globalStatsDesc}`,
@@ -1134,6 +1150,7 @@ ${topMentionText}
       socialContextSection,
       '请给出你的见解（≤80字）：'
     ].filter(Boolean).join('\n\n')
+    const userPrompt = appendPromptCurrentTime(userPromptBase)
 
     const endpoint = buildApiUrl(apiBaseUrl, '/chat/completions')
     const requestMessages = [
diff --git a/electron/services/messagePushService.ts b/electron/services/messagePushService.ts
index 3870ac0..fa8f3ad 100644
--- a/electron/services/messagePushService.ts
+++ b/electron/services/messagePushService.ts
@@ -2,6 +2,10 @@ import { ConfigService } from './config'
 import { chatService, type ChatSession, type Message } from './chatService'
 import { wcdbService } from './wcdbService'
 import { httpService } from './httpService'
+import { promises as fs } from 'fs'
+import path from 'path'
+import { createHash } from 'crypto'
+import { pathToFileURL } from 'url'
 
 interface SessionBaseline {
   lastTimestamp: number
@@ -33,6 +37,8 @@ class MessagePushService {
   private readonly sessionBaseline = new Map<string, SessionBaseline>()
   private readonly recentMessageKeys = new Map<string, number>()
   private readonly groupNicknameCache = new Map<string, { nicknames: Record<string, string>; updatedAt: number }>()
+  private readonly pushAvatarCacheDir: string
+  private readonly pushAvatarDataCache = new Map<string, string>()
   private readonly debounceMs = 350
   private readonly recentMessageTtlMs = 10 * 60 * 1000
   private readonly groupNicknameCacheTtlMs = 5 * 60 * 1000
@@ -45,6 +51,7 @@ class MessagePushService {
 
   constructor() {
     this.configService = ConfigService.getInstance()
+    this.pushAvatarCacheDir = path.join(this.configService.getCacheBasePath(), 'push-avatar-files')
   }
 
   start(): void {
@@ -310,12 +317,13 @@ class MessagePushService {
       const groupInfo = await chatService.getContactAvatar(sessionId)
       const groupName = session.displayName || groupInfo?.displayName || sessionId
       const sourceName = await this.resolveGroupSourceName(sessionId, message, session)
+      const avatarUrl = await this.normalizePushAvatarUrl(session.avatarUrl || groupInfo?.avatarUrl)
       return {
         event: 'message.new',
         sessionId,
         sessionType,
         messageKey,
-        avatarUrl: session.avatarUrl || groupInfo?.avatarUrl,
+        avatarUrl,
         groupName,
         sourceName,
         content
@@ -323,17 +331,63 @@ class MessagePushService {
     }
 
     const contactInfo = await chatService.getContactAvatar(sessionId)
+    const avatarUrl = await this.normalizePushAvatarUrl(session.avatarUrl || contactInfo?.avatarUrl)
     return {
       event: 'message.new',
       sessionId,
       sessionType,
       messageKey,
-      avatarUrl: session.avatarUrl || contactInfo?.avatarUrl,
+      avatarUrl,
       sourceName: session.displayName || contactInfo?.displayName || sessionId,
       content
     }
   }
 
+  private async normalizePushAvatarUrl(avatarUrl?: string): Promise<string | undefined> {
+    const normalized = String(avatarUrl || '').trim()
+    if (!normalized) return undefined
+    if (!normalized.startsWith('data:image/')) {
+      return normalized
+    }
+
+    const cached = this.pushAvatarDataCache.get(normalized)
+    if (cached) return cached
+
+    const match = /^data:(image\/[a-zA-Z0-9.+-]+);base64,(.+)$/i.exec(normalized)
+    if (!match) return undefined
+
+    try {
+      const mimeType = match[1].toLowerCase()
+      const base64Data = match[2]
+      const imageBuffer = Buffer.from(base64Data, 'base64')
+      if (!imageBuffer.length) return undefined
+
+      const ext = this.getImageExtFromMime(mimeType)
+      const hash = createHash('sha1').update(normalized).digest('hex')
+      const filePath = path.join(this.pushAvatarCacheDir, `avatar_${hash}.${ext}`)
+
+      await fs.mkdir(this.pushAvatarCacheDir, { recursive: true })
+      try {
+        await fs.access(filePath)
+      } catch {
+        await fs.writeFile(filePath, imageBuffer)
+      }
+
+      const fileUrl = pathToFileURL(filePath).toString()
+      this.pushAvatarDataCache.set(normalized, fileUrl)
+      return fileUrl
+    } catch {
+      return undefined
+    }
+  }
+
+  private getImageExtFromMime(mimeType: string): string {
+    if (mimeType === 'image/png') return 'png'
+    if (mimeType === 'image/gif') return 'gif'
+    if (mimeType === 'image/webp') return 'webp'
+    return 'jpg'
+  }
+
   private getSessionType(sessionId: string, session: ChatSession): MessagePushPayload['sessionType'] {
     if (sessionId.endsWith('@chatroom')) {
       return 'group'
diff --git a/electron/services/snsService.ts b/electron/services/snsService.ts
index 8d3fed7..69f5841 100644
--- a/electron/services/snsService.ts
+++ b/electron/services/snsService.ts
@@ -2,7 +2,7 @@ import { wcdbService } from './wcdbService'
 import { ConfigService } from './config'
 import { ContactCacheService } from './contactCacheService'
 import { app } from 'electron'
-import { existsSync, mkdirSync } from 'fs'
+import { existsSync, mkdirSync, unlinkSync } from 'fs'
 import { readFile, writeFile, mkdir } from 'fs/promises'
 import { basename, join } from 'path'
 import crypto from 'crypto'
@@ -174,8 +174,17 @@ const detectImageMime = (buf: Buffer, fallback: string = 'image/jpeg') => {
     // BMP
     if (buf[0] === 0x42 && buf[1] === 0x4d) return 'image/bmp'
 
-    // MP4: 00 00 00 18 / 20 / ... + 'ftyp'
-    if (buf.length > 8 && buf[4] === 0x66 && buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70) return 'video/mp4'
+    // ISO BMFF 家族：优先识别 AVIF/HEIF，避免误判为 MP4
+    if (buf.length > 12 && buf[4] === 0x66 && buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70) {
+        const ftypWindow = buf.subarray(8, Math.min(buf.length, 64)).toString('ascii').toLowerCase()
+        if (ftypWindow.includes('avif') || ftypWindow.includes('avis')) return 'image/avif'
+        if (
+            ftypWindow.includes('heic') || ftypWindow.includes('heix') ||
+            ftypWindow.includes('hevc') || ftypWindow.includes('hevx') ||
+            ftypWindow.includes('mif1') || ftypWindow.includes('msf1')
+        ) return 'image/heic'
+        return 'video/mp4'
+    }
 
     // Fallback logic for video
     if (fallback.includes('video') || fallback.includes('mp4')) return 'video/mp4'
@@ -1231,7 +1240,19 @@ class SnsService {
         const cacheKey = `${url}|${key ?? ''}`
 
         if (this.imageCache.has(cacheKey)) {
-            return { success: true, dataUrl: this.imageCache.get(cacheKey) }
+            const cachedDataUrl = this.imageCache.get(cacheKey) || ''
+            const base64Part = cachedDataUrl.split(',')[1] || ''
+            if (base64Part) {
+                try {
+                    const cachedBuf = Buffer.from(base64Part, 'base64')
+                    if (detectImageMime(cachedBuf, '').startsWith('image/')) {
+                        return { success: true, dataUrl: cachedDataUrl }
+                    }
+                } catch {
+                    // ignore and fall through to refetch
+                }
+            }
+            this.imageCache.delete(cacheKey)
         }
 
         const result = await this.fetchAndDecryptImage(url, key)
@@ -1244,6 +1265,9 @@ class SnsService {
             }
 
             if (result.data && result.contentType) {
+                if (!detectImageMime(result.data, '').startsWith('image/')) {
+                    return { success: false, error: '无效图片数据（可能密钥不匹配或缓存损坏）' }
+                }
                 const dataUrl = `data:${result.contentType};base64,${result.data.toString('base64')}`
                 this.imageCache.set(cacheKey, dataUrl)
                 return { success: true, dataUrl }
@@ -1853,8 +1877,13 @@ window.addEventListener('scroll',function(){document.getElementById('btt').class
                 }
 
                 const data = await readFile(cachePath)
-                const contentType = detectImageMime(data)
-                return { success: true, data, contentType, cachePath }
+                if (!detectImageMime(data, '').startsWith('image/')) {
+                    // 旧版本可能把未解密内容写入缓存；发现无效图片头时删除并重新拉取。
+                    try { unlinkSync(cachePath) } catch { }
+                } else {
+                    const contentType = detectImageMime(data)
+                    return { success: true, data, contentType, cachePath }
+                }
             } catch (e) {
                 console.warn(`[SnsService] 读取缓存失败: ${cachePath}`, e)
             }
@@ -2006,6 +2035,7 @@ window.addEventListener('scroll',function(){document.getElementById('btt').class
                         const xEnc = String(res.headers['x-enc'] || '').trim()
 
                         let decoded = raw
+                        const rawMagicMime = detectImageMime(raw, '')
 
                         // 图片逻辑
                         const shouldDecrypt = (xEnc === '1' || !!key) && key !== undefined && key !== null && String(key).trim().length > 0
@@ -2023,13 +2053,24 @@ window.addEventListener('scroll',function(){document.getElementById('btt').class
                                         decrypted[i] = raw[i] ^ keystream[i]
                                     }
 
-                                    decoded = decrypted
+                                    const decryptedMagicMime = detectImageMime(decrypted, '')
+                                    if (decryptedMagicMime.startsWith('image/')) {
+                                        decoded = decrypted
+                                    } else if (!rawMagicMime.startsWith('image/')) {
+                                        decoded = decrypted
+                                    }
                                 }
                             } catch (e) {
                                 console.error('[SnsService] TS Decrypt Error:', e)
                             }
                         }
 
+                        const decodedMagicMime = detectImageMime(decoded, '')
+                        if (!decodedMagicMime.startsWith('image/')) {
+                            resolve({ success: false, error: '图片解密失败：无法识别图片格式' })
+                            return
+                        }
+
                         // 写入磁盘缓存
                         try {
                             await writeFile(cachePath, decoded)
@@ -2063,6 +2104,15 @@ window.addEventListener('scroll',function(){document.getElementById('btt').class
         if (buf[0] === 0xFF && buf[1] === 0xD8 && buf[2] === 0xFF) return true
         if (buf[0] === 0x52 && buf[1] === 0x49 && buf[2] === 0x46 && buf[3] === 0x46
             && buf[8] === 0x57 && buf[9] === 0x45 && buf[10] === 0x42 && buf[11] === 0x50) return true
+        if (buf[4] === 0x66 && buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70) {
+            const ftypWindow = buf.subarray(8, Math.min(buf.length, 64)).toString('ascii').toLowerCase()
+            if (ftypWindow.includes('avif') || ftypWindow.includes('avis')) return true
+            if (
+                ftypWindow.includes('heic') || ftypWindow.includes('heix') ||
+                ftypWindow.includes('hevc') || ftypWindow.includes('hevx') ||
+                ftypWindow.includes('mif1') || ftypWindow.includes('msf1')
+            ) return true
+        }
         return false
     }
 
diff --git a/electron/services/videoService.ts b/electron/services/videoService.ts
index b108dec..4785621 100644
--- a/electron/services/videoService.ts
+++ b/electron/services/videoService.ts
@@ -1,8 +1,6 @@
 import { join } from 'path'
-import { existsSync, readdirSync, statSync, readFileSync, appendFileSync, mkdirSync, unlinkSync } from 'fs'
-import { spawn } from 'child_process'
+import { existsSync, readdirSync, statSync, readFileSync, appendFileSync, mkdirSync } from 'fs'
 import { pathToFileURL } from 'url'
-import crypto from 'crypto'
 import { app } from 'electron'
 import { ConfigService } from './config'
 import { wcdbService } from './wcdbService'
@@ -27,48 +25,15 @@ interface VideoIndexEntry {
 
 type PosterFormat = 'dataUrl' | 'fileUrl'
 
-function getStaticFfmpegPath(): string | null {
-  try {
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const ffmpegStatic = require('ffmpeg-static')
-    if (typeof ffmpegStatic === 'string') {
-      let fixedPath = ffmpegStatic
-      if (fixedPath.includes('app.asar') && !fixedPath.includes('app.asar.unpacked')) {
-        fixedPath = fixedPath.replace('app.asar', 'app.asar.unpacked')
-      }
-      if (existsSync(fixedPath)) return fixedPath
-    }
-  } catch {
-    // ignore
-  }
-
-  const ffmpegName = process.platform === 'win32' ? 'ffmpeg.exe' : 'ffmpeg'
-  const devPath = join(process.cwd(), 'node_modules', 'ffmpeg-static', ffmpegName)
-  if (existsSync(devPath)) return devPath
-
-  if (app.isPackaged) {
-    const packedPath = join(process.resourcesPath, 'app.asar.unpacked', 'node_modules', 'ffmpeg-static', ffmpegName)
-    if (existsSync(packedPath)) return packedPath
-  }
-
-  return null
-}
-
 class VideoService {
   private configService: ConfigService
   private hardlinkResolveCache = new Map<string, TimedCacheEntry<string | null>>()
   private videoInfoCache = new Map<string, TimedCacheEntry<VideoInfo>>()
   private videoDirIndexCache = new Map<string, TimedCacheEntry<Map<string, VideoIndexEntry>>>()
   private pendingVideoInfo = new Map<string, Promise<VideoInfo>>()
-  private pendingPosterExtract = new Map<string, Promise<string | null>>()
-  private extractedPosterCache = new Map<string, TimedCacheEntry<string | null>>()
-  private posterExtractRunning = 0
-  private posterExtractQueue: Array<() => void> = []
   private readonly hardlinkCacheTtlMs = 10 * 60 * 1000
   private readonly videoInfoCacheTtlMs = 2 * 60 * 1000
   private readonly videoIndexCacheTtlMs = 90 * 1000
-  private readonly extractedPosterCacheTtlMs = 15 * 60 * 1000
-  private readonly maxPosterExtractConcurrency = 1
   private readonly maxCacheEntries = 2000
   private readonly maxIndexEntries = 6
 
@@ -287,11 +252,9 @@ class VideoService {
   }
 
   async preloadVideoHardlinkMd5s(md5List: string[]): Promise<void> {
-    const dbPath = this.getDbPath()
-    const wxid = this.getMyWxid()
-    const cleanedWxid = this.cleanWxid(wxid)
-    if (!dbPath || !wxid) return
-    await this.resolveVideoHardlinks(md5List, dbPath, wxid, cleanedWxid)
+    // 视频链路已改为直接使用 packed_info_data 提取出的文件名索引本地目录。
+    // 该预热接口保留仅为兼容旧调用方，不再查询 hardlink.db。
+    void md5List
   }
 
   private fileToPosterUrl(filePath: string | undefined, mimeType: string, posterFormat: PosterFormat): string | undefined {
@@ -429,6 +392,23 @@ class VideoService {
     return null
   }
 
+  private normalizeVideoLookupKey(value: string): string {
+    let text = String(value || '').trim().toLowerCase()
+    if (!text) return ''
+    text = text.replace(/^.*[\\/]/, '')
+    text = text.replace(/\.(?:mp4|mov|m4v|avi|mkv|flv|jpg|jpeg|png|gif|dat)$/i, '')
+    text = text.replace(/_thumb$/, '')
+    const direct = /^([a-f0-9]{16,64})(?:_raw)?$/i.exec(text)
+    if (direct) {
+      const suffix = /_raw$/i.test(text) ? '_raw' : ''
+      return `${direct[1].toLowerCase()}${suffix}`
+    }
+    const preferred32 = /([a-f0-9]{32})(?![a-f0-9])/i.exec(text)
+    if (preferred32?.[1]) return preferred32[1].toLowerCase()
+    const fallback = /([a-f0-9]{16,64})(?![a-f0-9])/i.exec(text)
+    return String(fallback?.[1] || '').toLowerCase()
+  }
+
   private fallbackScanVideo(
     videoBaseDir: string,
     realVideoMd5: string,
@@ -473,154 +453,10 @@ class VideoService {
     return null
   }
 
-  private getFfmpegPath(): string {
-    const staticPath = getStaticFfmpegPath()
-    if (staticPath) return staticPath
-    return 'ffmpeg'
-  }
-
-  private async withPosterExtractSlot<T>(run: () => Promise<T>): Promise<T> {
-    if (this.posterExtractRunning >= this.maxPosterExtractConcurrency) {
-      await new Promise<void>((resolve) => {
-        this.posterExtractQueue.push(resolve)
-      })
-    }
-    this.posterExtractRunning += 1
-    try {
-      return await run()
-    } finally {
-      this.posterExtractRunning = Math.max(0, this.posterExtractRunning - 1)
-      const next = this.posterExtractQueue.shift()
-      if (next) next()
-    }
-  }
-
-  private async extractFirstFramePoster(videoPath: string, posterFormat: PosterFormat): Promise<string | null> {
-    const normalizedPath = String(videoPath || '').trim()
-    if (!normalizedPath || !existsSync(normalizedPath)) return null
-
-    const cacheKey = `${normalizedPath}|format=${posterFormat}`
-    const cached = this.readTimedCache(this.extractedPosterCache, cacheKey)
-    if (cached !== undefined) return cached
-
-    const pending = this.pendingPosterExtract.get(cacheKey)
-    if (pending) return pending
-
-    const task = this.withPosterExtractSlot(() => new Promise<string | null>((resolve) => {
-      const tmpDir = join(app.getPath('temp'), 'weflow_video_frames')
-      try {
-        if (!existsSync(tmpDir)) mkdirSync(tmpDir, { recursive: true })
-      } catch {
-        resolve(null)
-        return
-      }
-
-      const stableHash = crypto.createHash('sha1').update(normalizedPath).digest('hex').slice(0, 24)
-      const outputPath = join(tmpDir, `frame_${stableHash}.jpg`)
-      if (posterFormat === 'fileUrl' && existsSync(outputPath)) {
-        resolve(pathToFileURL(outputPath).toString())
-        return
-      }
-
-      const ffmpegPath = this.getFfmpegPath()
-      const args = [
-        '-hide_banner', '-loglevel', 'error', '-y',
-        '-ss', '0',
-        '-i', normalizedPath,
-        '-frames:v', '1',
-        '-q:v', '3',
-        outputPath
-      ]
-
-      const errChunks: Buffer[] = []
-      let done = false
-      const finish = (value: string | null) => {
-        if (done) return
-        done = true
-        if (posterFormat === 'dataUrl') {
-          try {
-            if (existsSync(outputPath)) unlinkSync(outputPath)
-          } catch {
-            // ignore
-          }
-        }
-        resolve(value)
-      }
-
-      const proc = spawn(ffmpegPath, args, {
-        stdio: ['ignore', 'ignore', 'pipe'],
-        windowsHide: true
-      })
-
-      const timer = setTimeout(() => {
-        try { proc.kill('SIGKILL') } catch { /* ignore */ }
-        finish(null)
-      }, 12000)
-
-      proc.stderr.on('data', (chunk: Buffer) => errChunks.push(chunk))
-
-      proc.on('error', () => {
-        clearTimeout(timer)
-        finish(null)
-      })
-
-      proc.on('close', (code: number) => {
-        clearTimeout(timer)
-        if (code !== 0 || !existsSync(outputPath)) {
-          if (errChunks.length > 0) {
-            this.log('extractFirstFrameDataUrl failed', {
-              videoPath: normalizedPath,
-              error: Buffer.concat(errChunks).toString().slice(0, 240)
-            })
-          }
-          finish(null)
-          return
-        }
-        try {
-          const jpgBuf = readFileSync(outputPath)
-          if (!jpgBuf.length) {
-            finish(null)
-            return
-          }
-          if (posterFormat === 'fileUrl') {
-            finish(pathToFileURL(outputPath).toString())
-            return
-          }
-          finish(`data:image/jpeg;base64,${jpgBuf.toString('base64')}`)
-        } catch {
-          finish(null)
-        }
-      })
-    }))
-
-    this.pendingPosterExtract.set(cacheKey, task)
-    try {
-      const result = await task
-      this.writeTimedCache(
-        this.extractedPosterCache,
-        cacheKey,
-        result,
-        this.extractedPosterCacheTtlMs,
-        this.maxCacheEntries
-      )
-      return result
-    } finally {
-      this.pendingPosterExtract.delete(cacheKey)
-    }
-  }
-
   private async ensurePoster(info: VideoInfo, includePoster: boolean, posterFormat: PosterFormat): Promise<VideoInfo> {
+    void posterFormat
     if (!includePoster) return info
-    if (!info.exists || !info.videoUrl) return info
-    if (info.coverUrl || info.thumbUrl) return info
-
-    const extracted = await this.extractFirstFramePoster(info.videoUrl, posterFormat)
-    if (!extracted) return info
-    return {
-      ...info,
-      coverUrl: extracted,
-      thumbUrl: extracted
-    }
+    return info
   }
 
   /**
@@ -652,7 +488,7 @@ class VideoService {
     if (pending) return pending
 
     const task = (async (): Promise<VideoInfo> => {
-      const realVideoMd5 = await this.queryVideoFileName(normalizedMd5) || normalizedMd5
+      const realVideoMd5 = this.normalizeVideoLookupKey(normalizedMd5) || normalizedMd5
       const videoBaseDir = this.resolveVideoBaseDir(dbPath, wxid)
 
       if (!existsSync(videoBaseDir)) {
@@ -678,7 +514,7 @@ class VideoService {
 
       const miss = { exists: false }
       this.writeTimedCache(this.videoInfoCache, cacheKey, miss, this.videoInfoCacheTtlMs, this.maxCacheEntries)
-      this.log('getVideoInfo: 未找到视频', { inputMd5: normalizedMd5, resolvedMd5: realVideoMd5 })
+      this.log('getVideoInfo: 未找到视频', { lookupKey: normalizedMd5, normalizedKey: realVideoMd5 })
       return miss
     })()
 
diff --git a/electron/services/wcdbCore.ts b/electron/services/wcdbCore.ts
index 0f6a84b..af797f7 100644
--- a/electron/services/wcdbCore.ts
+++ b/electron/services/wcdbCore.ts
@@ -2011,6 +2011,14 @@ export class WcdbCore {
         }
         return ''
       }
+      const pickRaw = (row: Record<string, any>, keys: string[]): unknown => {
+        for (const key of keys) {
+          const value = row[key]
+          if (value === null || value === undefined) continue
+          return value
+        }
+        return undefined
+      }
       const extractXmlValue = (xml: string, tag: string): string => {
         if (!xml) return ''
         const regex = new RegExp(`<${tag}>([\\s\\S]*?)</${tag}>`, 'i')
@@ -2096,25 +2104,37 @@ export class WcdbCore {
         const md5Like = /([0-9a-fA-F]{16,64})/.exec(fileBase)
         return String(md5Like?.[1] || fileBase || '').trim().toLowerCase()
       }
-      const decodePackedToPrintable = (raw: string): string => {
-        const text = String(raw || '').trim()
-        if (!text) return ''
-        let buf: Buffer | null = null
-        if (/^[a-fA-F0-9]+$/.test(text) && text.length % 2 === 0) {
-          try {
-            buf = Buffer.from(text, 'hex')
-          } catch {
-            buf = null
+      const decodePackedInfoBuffer = (raw: unknown): Buffer | null => {
+        if (!raw) return null
+        if (Buffer.isBuffer(raw)) return raw
+        if (raw instanceof Uint8Array) return Buffer.from(raw)
+        if (Array.isArray(raw)) return Buffer.from(raw as any[])
+        if (typeof raw === 'string') {
+          const text = raw.trim()
+          if (!text) return null
+          const compactHex = text.replace(/\s+/g, '')
+          if (/^[a-fA-F0-9]+$/.test(compactHex) && compactHex.length % 2 === 0) {
+            try {
+              return Buffer.from(compactHex, 'hex')
+            } catch {
+              // ignore
+            }
           }
-        }
-        if (!buf) {
           try {
             const base64 = Buffer.from(text, 'base64')
-            if (base64.length > 0) buf = base64
+            if (base64.length > 0) return base64
           } catch {
-            buf = null
+            // ignore
           }
+          return null
         }
+        if (typeof raw === 'object' && raw !== null && Array.isArray((raw as any).data)) {
+          return Buffer.from((raw as any).data)
+        }
+        return null
+      }
+      const decodePackedToPrintable = (raw: unknown): string => {
+        const buf = decodePackedInfoBuffer(raw)
         if (!buf || buf.length === 0) return ''
         const printable: number[] = []
         for (const byte of buf) {
@@ -2129,6 +2149,46 @@ export class WcdbCore {
         const match = /([a-fA-F0-9]{32})/.exec(input)
         return String(match?.[1] || '').toLowerCase()
       }
+      const normalizeVideoFileToken = (value: unknown): string => {
+        let text = String(value || '').trim().toLowerCase()
+        if (!text) return ''
+        text = text.replace(/^.*[\\/]/, '')
+        text = text.replace(/\.(?:mp4|mov|m4v|avi|mkv|flv|jpg|jpeg|png|gif|dat)$/i, '')
+        text = text.replace(/_thumb$/, '')
+        const direct = /^([a-f0-9]{16,64})(?:_raw)?$/i.exec(text)
+        if (direct) {
+          const suffix = /_raw$/i.test(text) ? '_raw' : ''
+          return `${direct[1].toLowerCase()}${suffix}`
+        }
+        const preferred32 = /([a-f0-9]{32})(?![a-f0-9])/i.exec(text)
+        if (preferred32?.[1]) return preferred32[1].toLowerCase()
+        const fallback = /([a-f0-9]{16,64})(?![a-f0-9])/i.exec(text)
+        return String(fallback?.[1] || '').toLowerCase()
+      }
+      const extractVideoFileNameFromPackedRaw = (raw: unknown): string => {
+        const buf = decodePackedInfoBuffer(raw)
+        if (!buf || buf.length === 0) return ''
+        const candidates: string[] = []
+        let current = ''
+        for (const byte of buf) {
+          const isHex =
+            (byte >= 0x30 && byte <= 0x39) ||
+            (byte >= 0x41 && byte <= 0x46) ||
+            (byte >= 0x61 && byte <= 0x66)
+          if (isHex) {
+            current += String.fromCharCode(byte)
+            continue
+          }
+          if (current.length >= 16) candidates.push(current)
+          current = ''
+        }
+        if (current.length >= 16) candidates.push(current)
+        if (candidates.length === 0) return ''
+        const exact32 = candidates.find((item) => item.length === 32)
+        if (exact32) return exact32.toLowerCase()
+        const fallback = candidates.find((item) => item.length >= 16 && item.length <= 64)
+        return String(fallback || '').toLowerCase()
+      }
       const extractImageDatName = (row: Record<string, any>, content: string): string => {
         const direct = pickString(row, [
           'image_path',
@@ -2147,7 +2207,7 @@ export class WcdbCore {
         const normalizedXml = normalizeDatBase(xmlCandidate)
         if (normalizedXml) return normalizedXml
 
-        const packedRaw = pickString(row, [
+        const packedRaw = pickRaw(row, [
           'packed_info_data',
           'packedInfoData',
           'packed_info_blob',
@@ -2172,7 +2232,7 @@ export class WcdbCore {
         return ''
       }
       const extractPackedPayload = (row: Record<string, any>): string => {
-        const packedRaw = pickString(row, [
+        const packedRaw = pickRaw(row, [
           'packed_info_data',
           'packedInfoData',
           'packed_info_blob',
@@ -2327,6 +2387,20 @@ export class WcdbCore {
         const packedPayload = extractPackedPayload(row)
         const imageMd5ByColumn = pickString(row, ['image_md5', 'imageMd5'])
         const videoMd5ByColumn = pickString(row, ['video_md5', 'videoMd5', 'raw_md5', 'rawMd5'])
+        const packedRaw = pickRaw(row, [
+          'packed_info_data',
+          'packedInfoData',
+          'packed_info_blob',
+          'packedInfoBlob',
+          'packed_info',
+          'packedInfo',
+          'BytesExtra',
+          'bytes_extra',
+          'WCDB_CT_packed_info',
+          'reserved0',
+          'Reserved0',
+          'WCDB_CT_Reserved0'
+        ])
 
         let content = ''
         let imageMd5: string | undefined
@@ -2342,10 +2416,17 @@ export class WcdbCore {
             if (!imageDatName) imageDatName = extractImageDatName(row, content) || undefined
           }
         } else if (localType === 43) {
-          videoMd5 = videoMd5ByColumn || extractHexMd5(packedPayload) || undefined
+          videoMd5 =
+            extractVideoFileNameFromPackedRaw(packedRaw) ||
+            normalizeVideoFileToken(videoMd5ByColumn) ||
+            extractHexMd5(packedPayload) ||
+            undefined
           if (!videoMd5) {
             content = decodeContentIfNeeded()
-            videoMd5 = extractVideoMd5(content) || extractHexMd5(packedPayload) || undefined
+            videoMd5 =
+              normalizeVideoFileToken(extractVideoMd5(content)) ||
+              extractHexMd5(packedPayload) ||
+              undefined
           } else if (useRawMessageContent) {
             // 占位态标题只依赖简单 XML，已带 md5 时不做额外解压
             content = rawMessageContent
diff --git a/src/components/Sns/SnsPostItem.tsx b/src/components/Sns/SnsPostItem.tsx
index 9a7ee16..adb7be1 100644
--- a/src/components/Sns/SnsPostItem.tsx
+++ b/src/components/Sns/SnsPostItem.tsx
@@ -1,4 +1,4 @@
-import React, { useState, useMemo, useEffect } from 'react'
+import React, { useState, useMemo, useEffect, useRef } from 'react'
 import { createPortal } from 'react-dom'
 import { Heart, ChevronRight, ImageIcon, Code, Trash2, MapPin } from 'lucide-react'
 import { SnsPost, SnsLinkCardData, SnsLocation } from '../../types/sns'
@@ -8,6 +8,7 @@ import { getEmojiPath } from 'wechat-emojis'
 
 // Helper functions (extracted from SnsPage.tsx but simplified/reused)
 const LINK_XML_URL_TAGS = ['url', 'shorturl', 'weburl', 'webpageurl', 'jumpurl']
+const LINK_XML_DIRECT_URL_TAGS = ['contentUrl', ...LINK_XML_URL_TAGS]
 const LINK_XML_TITLE_TAGS = ['title', 'linktitle', 'webtitle']
 const MEDIA_HOST_HINTS = ['mmsns.qpic.cn', 'vweixinthumb', 'snstimeline', 'snsvideodownload']
 
@@ -29,6 +30,13 @@ const decodeHtmlEntities = (text: string): string => {
         .trim()
 }
 
+const normalizeRawXmlForParsing = (xml: string): string => {
+    if (!xml) return ''
+    return decodeHtmlEntities(xml)
+        .replace(/\\+"/g, '"')
+        .replace(/\\+'/g, "'")
+}
+
 const normalizeUrlCandidate = (raw: string): string | null => {
     const value = decodeHtmlEntities(raw).replace(/[)\],.;]+$/, '').trim()
     if (!value) return null
@@ -43,12 +51,13 @@ const simplifyUrlForCompare = (value: string): string => {
 }
 
 const getXmlTagValues = (xml: string, tags: string[]): string[] => {
-    if (!xml) return []
+    const normalizedXml = normalizeRawXmlForParsing(xml)
+    if (!normalizedXml) return []
     const results: string[] = []
     for (const tag of tags) {
         const reg = new RegExp(`<${tag}>([\\s\\S]*?)<\\/${tag}>`, 'ig')
         let match: RegExpExecArray | null
-        while ((match = reg.exec(xml)) !== null) {
+        while ((match = reg.exec(normalizedXml)) !== null) {
             if (match[1]) results.push(match[1])
         }
     }
@@ -65,20 +74,87 @@ const isLikelyMediaAssetUrl = (url: string): boolean => {
     return MEDIA_HOST_HINTS.some((hint) => lower.includes(hint))
 }
 
+const normalizeSnsAssetUrl = (url: string, token?: string, encIdx?: string): string => {
+    const base = decodeHtmlEntities(url).trim()
+    if (!base) return ''
+
+    let fixed = base.replace(/^http:\/\//i, 'https://')
+
+    const normalizedToken = decodeHtmlEntities(String(token || '')).trim()
+    const normalizedEncIdx = decodeHtmlEntities(String(encIdx || '')).trim()
+    const effectiveIdx = normalizedEncIdx || (normalizedToken ? '1' : '')
+    const appendParams: string[] = []
+    if (normalizedToken && !/[?&]token=/i.test(fixed)) {
+        appendParams.push(`token=${normalizedToken}`)
+    }
+    if (effectiveIdx && !/[?&]idx=/i.test(fixed)) {
+        appendParams.push(`idx=${effectiveIdx}`)
+    }
+    if (appendParams.length > 0) {
+        const connector = fixed.includes('?') ? '&' : '?'
+        fixed = `${fixed}${connector}${appendParams.join('&')}`
+    }
+    return fixed
+}
+
+const extractCardThumbMetaFromXml = (xml: string): { thumb?: string; thumbKey?: string } => {
+    const normalizedXml = normalizeRawXmlForParsing(xml)
+    if (!normalizedXml) return {}
+    const mediaMatch = normalizedXml.match(/<media>([\s\S]*?)<\/media>/i)
+    if (!mediaMatch?.[1]) return {}
+
+    const mediaXml = mediaMatch[1]
+    const thumbMatch = mediaXml.match(/<thumb([^>]*)>([^<]+)<\/thumb>/i)
+    if (!thumbMatch) return {}
+
+    const attrs = thumbMatch[1] || ''
+    const getAttr = (name: string): string | undefined => {
+        const reg = new RegExp(`${name}\\s*=\\s*(?:\"([^\"]+)\"|'([^']+)'|([^\\s>]+))`, 'i')
+        const m = attrs.match(reg)
+        return decodeHtmlEntities((m?.[1] || m?.[2] || m?.[3] || '').trim()) || undefined
+    }
+    const thumbRawUrl = thumbMatch[2] || ''
+    const thumbToken = getAttr('token')
+    const thumbKey = getAttr('key')
+    const thumbEncIdx = getAttr('enc_idx')
+    const thumb = normalizeSnsAssetUrl(thumbRawUrl, thumbToken, thumbEncIdx)
+
+    return {
+        thumb: thumb || undefined,
+        thumbKey: thumbKey ? decodeHtmlEntities(thumbKey).trim() : undefined
+    }
+}
+
+const pickCardTitle = (post: SnsPost): string => {
+    const titleCandidates = [
+        post.linkTitle || '',
+        ...getXmlTagValues(post.rawXml || '', LINK_XML_TITLE_TAGS),
+        post.contentDesc || ''
+    ]
+    return titleCandidates
+        .map((value) => decodeHtmlEntities(value))
+        .find((value) => Boolean(value) && !/^https?:\/\//i.test(value)) || '网页链接'
+}
+
 const buildLinkCardData = (post: SnsPost): SnsLinkCardData | null => {
-    // type 3 是链接类型，直接用 media[0] 的 url 和 thumb
-    if (post.type === 3) {
-        const url = post.media[0]?.url || post.linkUrl
-        if (!url) return null
-        const titleCandidates = [
-            post.linkTitle || '',
-            ...getXmlTagValues(post.rawXml || '', LINK_XML_TITLE_TAGS),
-            post.contentDesc || ''
+    // type 3 / 5 是链接卡片类型，优先按卡片链接解析
+    if (post.type === 3 || post.type === 5) {
+        const thumbMeta = extractCardThumbMetaFromXml(post.rawXml || '')
+        const directUrlCandidates = [
+            post.linkUrl || '',
+            ...getXmlTagValues(post.rawXml || '', LINK_XML_DIRECT_URL_TAGS),
+            ...post.media.map((item) => item.url || '')
         ]
-        const title = titleCandidates
-            .map((v) => decodeHtmlEntities(v))
-            .find((v) => Boolean(v) && !/^https?:\/\//i.test(v))
-        return { url, title: title || '网页链接', thumb: post.media[0]?.thumb }
+        const url = directUrlCandidates
+            .map(normalizeUrlCandidate)
+            .find((value): value is string => Boolean(value))
+        if (!url) return null
+        return {
+            url,
+            title: pickCardTitle(post),
+            thumb: thumbMeta.thumb || post.media[0]?.thumb || post.media[0]?.url,
+            thumbKey: thumbMeta.thumbKey || post.media[0]?.key
+        }
     }
 
     const hasVideoMedia = post.type === 15 || post.media.some((item) => isSnsVideoUrl(item.url))
@@ -117,19 +193,9 @@ const buildLinkCardData = (post: SnsPost): SnsLinkCardData | null => {
 
     if (!linkUrl) return null
 
-    const titleCandidates = [
-        post.linkTitle || '',
-        ...getXmlTagValues(post.rawXml || '', LINK_XML_TITLE_TAGS),
-        post.contentDesc || ''
-    ]
-
-    const title = titleCandidates
-        .map((value) => decodeHtmlEntities(value))
-        .find((value) => Boolean(value) && !/^https?:\/\//i.test(value))
-
     return {
         url: linkUrl,
-        title: title || '网页链接',
+        title: pickCardTitle(post),
         thumb: post.media[0]?.thumb || post.media[0]?.url
     }
 }
@@ -158,8 +224,11 @@ const buildLocationText = (location?: SnsLocation): string => {
     return primary || region
 }
 
-const SnsLinkCard = ({ card }: { card: SnsLinkCardData }) => {
+const SnsLinkCard = ({ card, thumbKey }: { card: SnsLinkCardData; thumbKey?: string }) => {
     const [thumbFailed, setThumbFailed] = useState(false)
+    const [thumbSrc, setThumbSrc] = useState(card.thumb || '')
+    const [reloadNonce, setReloadNonce] = useState(0)
+    const retryCountRef = useRef(0)
     const hostname = useMemo(() => {
         try {
             return new URL(card.url).hostname.replace(/^www\./i, '')
@@ -168,6 +237,58 @@ const SnsLinkCard = ({ card }: { card: SnsLinkCardData }) => {
         }
     }, [card.url])
 
+    useEffect(() => {
+        retryCountRef.current = 0
+    }, [card.thumb, thumbKey])
+
+    const scheduleRetry = () => {
+        if (retryCountRef.current >= 2) return
+        retryCountRef.current += 1
+        window.setTimeout(() => {
+            setReloadNonce((v) => v + 1)
+        }, 900)
+    }
+
+    useEffect(() => {
+        const rawThumb = card.thumb || ''
+        setThumbFailed(false)
+        setThumbSrc(rawThumb)
+        if (!rawThumb) return
+
+        let cancelled = false
+        const loadThumb = async () => {
+            try {
+                const result = await window.electronAPI.sns.proxyImage({
+                    url: rawThumb,
+                    key: thumbKey
+                })
+                if (cancelled) return
+                if (!result.success) {
+                    console.warn('[SnsLinkCard] thumb decrypt failed', {
+                        url: rawThumb,
+                        key: thumbKey,
+                        error: result.error
+                    })
+                    scheduleRetry()
+                    return
+                }
+                if (result.dataUrl) {
+                    setThumbSrc(result.dataUrl)
+                    return
+                }
+                if (result.videoPath) {
+                    setThumbSrc(`file://${result.videoPath.replace(/\\/g, '/')}`)
+                }
+            } catch {
+                // noop: keep raw thumb fallback
+                scheduleRetry()
+            }
+        }
+
+        loadThumb()
+        return () => { cancelled = true }
+    }, [card.thumb, thumbKey, reloadNonce])
+
     const handleClick = async (e: React.MouseEvent<HTMLButtonElement>) => {
         e.stopPropagation()
         try {
@@ -180,13 +301,31 @@ const SnsLinkCard = ({ card }: { card: SnsLinkCardData }) => {
     return (
         <button type="button" className="post-link-card" onClick={handleClick}>
             <div className="link-thumb">
-                {card.thumb && !thumbFailed ? (
+                {thumbSrc && !thumbFailed ? (
                     <img
-                        src={card.thumb}
+                        src={thumbSrc}
                         alt=""
                         referrerPolicy="no-referrer"
                         loading="lazy"
-                        onError={() => setThumbFailed(true)}
+                        onError={() => {
+                            const rawThumb = card.thumb || ''
+                            if (thumbSrc !== rawThumb && rawThumb) {
+                                console.warn('[SnsLinkCard] thumb render failed, fallback raw thumb', {
+                                    failedSrc: thumbSrc,
+                                    rawThumb,
+                                    key: thumbKey
+                                })
+                                setThumbSrc(rawThumb)
+                                return
+                            }
+                            console.warn('[SnsLinkCard] thumb render failed, fallback exhausted', {
+                                failedSrc: thumbSrc,
+                                rawThumb,
+                                key: thumbKey
+                            })
+                            setThumbFailed(true)
+                            scheduleRetry()
+                        }}
                     />
                 ) : (
                     <div className="link-thumb-fallback">
@@ -278,9 +417,11 @@ export const SnsPostItem: React.FC<SnsPostItemProps> = ({ post, onPreview, onDeb
     const [deleting, setDeleting] = useState(false)
     const [showDeleteConfirm, setShowDeleteConfirm] = useState(false)
     const linkCard = buildLinkCardData(post)
+    const linkCardThumbKey = linkCard?.thumbKey || post.media[0]?.key
     const locationText = useMemo(() => buildLocationText(post.location), [post.location])
     const hasVideoMedia = post.type === 15 || post.media.some((item) => isSnsVideoUrl(item.url))
-    const showLinkCard = Boolean(linkCard) && post.media.length <= 1 && !hasVideoMedia
+    const isLinkCardType = post.type === 3 || post.type === 5
+    const showLinkCard = Boolean(linkCard) && !hasVideoMedia && (isLinkCardType || post.media.length <= 1)
     const showMediaGrid = post.media.length > 0 && !showLinkCard
 
     const formatTime = (ts: number) => {
@@ -412,7 +553,7 @@ export const SnsPostItem: React.FC<SnsPostItemProps> = ({ post, onPreview, onDeb
                 )}
 
                 {showLinkCard && linkCard && (
-                    <SnsLinkCard card={linkCard} />
+                    <SnsLinkCard card={linkCard} thumbKey={linkCardThumbKey} />
                 )}
 
                 {showMediaGrid && (
diff --git a/src/pages/ChatPage.scss b/src/pages/ChatPage.scss
index 60b99ee..e998744 100644
--- a/src/pages/ChatPage.scss
+++ b/src/pages/ChatPage.scss
@@ -3043,6 +3043,30 @@
     gap: 10px;
   }
 
+  .table-name-summary {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    padding: 9px 12px;
+    margin-bottom: 10px;
+    border-radius: 10px;
+    border: 1px solid color-mix(in srgb, var(--border-color) 72%, transparent);
+    background: color-mix(in srgb, var(--card-bg) 90%, transparent);
+    font-size: 12px;
+
+    .table-name-label {
+      color: var(--text-secondary);
+      flex-shrink: 0;
+    }
+
+    .table-name-value {
+      color: var(--text-primary);
+      font-weight: 500;
+      word-break: break-all;
+      user-select: text;
+    }
+  }
+
   .detail-table-placeholder {
     padding: 11px 12px;
     background: color-mix(in srgb, var(--card-bg) 84%, transparent);
@@ -3056,6 +3080,7 @@
     display: flex;
     align-items: center;
     justify-content: space-between;
+    gap: 10px;
     padding: 10px 12px;
     background: color-mix(in srgb, var(--card-bg) 90%, transparent);
     border: 1px solid color-mix(in srgb, var(--border-color) 72%, transparent);
@@ -3071,15 +3096,17 @@
     .db-name {
       color: var(--text-primary);
       font-weight: 500;
-      max-width: 62%;
-      overflow: hidden;
-      text-overflow: ellipsis;
-      white-space: nowrap;
+      line-height: 1.35;
+      word-break: break-all;
+      user-select: text;
+      flex: 1;
     }
 
     .table-count {
       color: var(--primary);
       font-weight: 600;
+      flex-shrink: 0;
+      user-select: text;
     }
   }
 }
diff --git a/src/pages/ChatPage.tsx b/src/pages/ChatPage.tsx
index c71b227..8adc390 100644
--- a/src/pages/ChatPage.tsx
+++ b/src/pages/ChatPage.tsx
@@ -7424,14 +7424,29 @@ function ChatPage(props: ChatPageProps) {
                           <span>数据库分布</span>
                         </div>
                         {Array.isArray(sessionDetail.messageTables) && sessionDetail.messageTables.length > 0 ? (
-                          <div className="table-list">
-                            {sessionDetail.messageTables.map((t, i) => (
-                              <div key={i} className="table-item">
-                                <span className="db-name">{t.dbName}</span>
-                                <span className="table-count">{t.count.toLocaleString()} 条</span>
-                              </div>
-                            ))}
-                          </div>
+                          <>
+                            <div className="table-name-summary">
+                              <span className="table-name-label">表名</span>
+                              <span className="table-name-value">
+                                {(() => {
+                                  const tableNames = Array.from(new Set(
+                                    sessionDetail.messageTables
+                                      .map(item => String(item.tableName || '').trim())
+                                      .filter(Boolean)
+                                  ))
+                                  return tableNames[0] || '—'
+                                })()}
+                              </span>
+                            </div>
+                            <div className="table-list">
+                              {sessionDetail.messageTables.map((t, i) => (
+                                <div key={`${t.dbName}-${t.tableName}-${i}`} className="table-item">
+                                  <span className="db-name">{t.dbName || '—'}</span>
+                                  <span className="table-count">{t.count.toLocaleString()} 条</span>
+                                </div>
+                              ))}
+                            </div>
+                          </>
                         ) : (
                           <div className="detail-table-placeholder">
                             {isLoadingDetailExtra ? '统计中...' : '暂无统计数据'}
diff --git a/src/pages/ExportPage.tsx b/src/pages/ExportPage.tsx
index 1bdf337..362960a 100644
--- a/src/pages/ExportPage.tsx
+++ b/src/pages/ExportPage.tsx
@@ -178,6 +178,7 @@ interface ExportTask {
   title: string
   status: TaskStatus
   settledSessionIds?: string[]
+  sessionOutputPaths?: Record<string, string>
   createdAt: number
   startedAt?: number
   finishedAt?: number
@@ -653,6 +654,32 @@ const formatPathBrief = (value: string, maxLength = 52): string => {
   return `${normalized.slice(0, headLength)}…${normalized.slice(-tailLength)}`
 }
 
+const resolveParentDir = (value: string): string => {
+  const normalized = String(value || '').trim()
+  if (!normalized) return ''
+  const noTrailing = normalized.replace(/[\\/]+$/, '')
+  if (!noTrailing) return normalized
+  const lastSlash = Math.max(noTrailing.lastIndexOf('/'), noTrailing.lastIndexOf('\\'))
+  if (lastSlash < 0) return normalized
+  if (lastSlash === 0) return noTrailing.slice(0, 1)
+  if (/^[A-Za-z]:$/.test(noTrailing.slice(0, lastSlash))) {
+    return `${noTrailing.slice(0, lastSlash)}\\`
+  }
+  return noTrailing.slice(0, lastSlash)
+}
+
+const resolveTaskOpenDir = (task: ExportTask): string => {
+  const sessionIds = Array.isArray(task.payload.sessionIds) ? task.payload.sessionIds : []
+  if (sessionIds.length === 1) {
+    const onlySessionId = String(sessionIds[0] || '').trim()
+    const outputPath = onlySessionId ? String(task.sessionOutputPaths?.[onlySessionId] || '').trim() : ''
+    if (outputPath) {
+      return resolveParentDir(outputPath) || task.payload.outputDir
+    }
+  }
+  return task.payload.outputDir
+}
+
 const formatRecentExportTime = (timestamp?: number, now = Date.now()): string => {
   if (!timestamp) return ''
   const diff = Math.max(0, now - timestamp)
@@ -2005,7 +2032,14 @@ const TaskCenterModal = memo(function TaskCenterModal({
                           {isPerfExpanded ? '收起详情' : '性能详情'}
                         </button>
                       )}
-                      <button className="task-action-btn" onClick={() => task.payload.outputDir && void window.electronAPI.shell.openPath(task.payload.outputDir)}>
+                      <button
+                        className="task-action-btn"
+                        onClick={() => {
+                          const openDir = resolveTaskOpenDir(task)
+                          if (!openDir) return
+                          void window.electronAPI.shell.openPath(openDir)
+                        }}
+                      >
                         <FolderOpen size={14} /> 目录
                       </button>
                     </div>
@@ -5715,6 +5749,12 @@ function ExportPage() {
             ...task,
             status: 'success',
             finishedAt: doneAt,
+            sessionOutputPaths: {
+              ...(task.sessionOutputPaths || {}),
+              ...((result.sessionOutputPaths && typeof result.sessionOutputPaths === 'object')
+                ? result.sessionOutputPaths
+                : {})
+            },
             progress: {
               ...task.progress,
               current: task.progress.total || next.payload.sessionIds.length,
diff --git a/src/pages/ResourcesPage.scss b/src/pages/ResourcesPage.scss
index cdbd17c..920fe3f 100644
--- a/src/pages/ResourcesPage.scss
+++ b/src/pages/ResourcesPage.scss
@@ -281,10 +281,10 @@
     }
   }
 
+  .floating-info,
   .floating-delete {
     position: absolute;
     top: 10px;
-    right: 10px;
     z-index: 4;
     width: 28px;
     height: 28px;
@@ -302,6 +302,18 @@
     transition: opacity 0.16s ease, transform 0.16s ease;
   }
 
+  .floating-info {
+    right: 10px;
+    border-color: color-mix(in srgb, var(--primary) 42%, var(--border-color));
+    color: var(--text-primary);
+  }
+
+  .floating-delete {
+    right: 44px;
+  }
+
+  .media-card:hover .floating-info,
+  .media-card:focus-within .floating-info,
   .media-card:hover .floating-delete,
   .media-card:focus-within .floating-delete {
     opacity: 1;
@@ -490,7 +502,9 @@
   .resource-dialog-mask {
     position: absolute;
     inset: 0;
-    background: rgba(8, 11, 18, 0.24);
+    background: rgba(8, 11, 18, 0.46);
+    backdrop-filter: blur(2px);
+    -webkit-backdrop-filter: blur(2px);
     display: flex;
     align-items: center;
     justify-content: center;
@@ -498,11 +512,13 @@
   }
 
   .resource-dialog {
+    --dialog-surface: color-mix(in srgb, var(--bg-primary, #ffffff) 82%, var(--card-inner-bg, #ffffff) 18%);
+    --dialog-surface-header: color-mix(in srgb, var(--dialog-surface) 90%, var(--bg-secondary, #ffffff) 10%);
     width: min(420px, calc(100% - 32px));
-    background: var(--card-bg, #ffffff);
+    background: var(--dialog-surface);
     border: 1px solid color-mix(in srgb, var(--border-color) 90%, transparent);
     border-radius: 14px;
-    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.22);
+    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.28);
     overflow: hidden;
   }
 
@@ -512,7 +528,7 @@
     font-weight: 600;
     color: var(--text-primary);
     border-bottom: 1px solid color-mix(in srgb, var(--border-color) 80%, transparent);
-    background: color-mix(in srgb, var(--bg-secondary) 85%, transparent);
+    background: var(--dialog-surface-header);
   }
 
   .dialog-body {
@@ -521,6 +537,34 @@
     color: var(--text-secondary);
     line-height: 1.55;
     white-space: pre-wrap;
+    background: var(--dialog-surface);
+  }
+
+  .dialog-info-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+  }
+
+  .dialog-info-row {
+    display: grid;
+    grid-template-columns: 110px 1fr;
+    gap: 10px;
+    align-items: flex-start;
+  }
+
+  .info-label {
+    color: var(--text-tertiary);
+    font-size: 12px;
+    line-height: 1.45;
+  }
+
+  .info-value {
+    color: var(--text-primary);
+    line-height: 1.5;
+    word-break: break-all;
+    white-space: pre-wrap;
+    user-select: text;
   }
 
   .dialog-actions {
@@ -528,6 +572,7 @@
     display: flex;
     justify-content: flex-end;
     gap: 8px;
+    background: var(--dialog-surface);
   }
 
   .dialog-btn {
diff --git a/src/pages/ResourcesPage.tsx b/src/pages/ResourcesPage.tsx
index 9d1d0c0..5e2dedc 100644
--- a/src/pages/ResourcesPage.tsx
+++ b/src/pages/ResourcesPage.tsx
@@ -1,5 +1,5 @@
 import { forwardRef, memo, useCallback, useEffect, useMemo, useRef, useState, type HTMLAttributes } from 'react'
-import { Calendar, Image as ImageIcon, Loader2, PlayCircle, RefreshCw, Trash2, UserRound } from 'lucide-react'
+import { Calendar, Image as ImageIcon, Info, Loader2, PlayCircle, RefreshCw, Trash2, UserRound } from 'lucide-react'
 import { VirtuosoGrid } from 'react-virtuoso'
 import { finishBackgroundTask, registerBackgroundTask, updateBackgroundTask } from '../services/backgroundTaskMonitor'
 import './ResourcesPage.scss'
@@ -28,9 +28,10 @@ interface ContactOption {
 }
 
 type DialogState = {
-  mode: 'alert' | 'confirm'
+  mode: 'alert' | 'confirm' | 'info'
   title: string
-  message: string
+  message?: string
+  infoRows?: Array<{ label: string; value: string }>
   confirmText?: string
   cancelText?: string
   onConfirm?: (() => void) | null
@@ -115,6 +116,12 @@ function formatTimeLabel(timestampSec: number): string {
   })
 }
 
+function formatInfoValue(value: unknown): string {
+  if (value === null || value === undefined) return '-'
+  const text = String(value).trim()
+  return text || '-'
+}
+
 function extractVideoTitle(content?: string): string {
   const xml = String(content || '')
   if (!xml) return '视频'
@@ -152,6 +159,7 @@ const MediaCard = memo(function MediaCard({
   decrypting,
   onToggleSelect,
   onDelete,
+  onShowInfo,
   onImagePreviewAction,
   onUpdateImageQuality,
   onOpenVideo,
@@ -167,6 +175,7 @@ const MediaCard = memo(function MediaCard({
   decrypting: boolean
   onToggleSelect: (item: MediaStreamItem) => void
   onDelete: (item: MediaStreamItem) => void
+  onShowInfo: (item: MediaStreamItem) => void
   onImagePreviewAction: (item: MediaStreamItem) => void
   onUpdateImageQuality: (item: MediaStreamItem) => void
   onOpenVideo: (item: MediaStreamItem) => void
@@ -178,6 +187,9 @@ const MediaCard = memo(function MediaCard({
 
   return (
     <article className={`media-card ${selected ? 'selected' : ''} ${isDecryptingVisual ? 'decrypting' : ''}`}>
+      <button type="button" className="floating-info" onClick={() => onShowInfo(item)} aria-label="查看资源信息">
+        <Info size={14} />
+      </button>
       <button type="button" className="floating-delete" onClick={() => onDelete(item)} aria-label="删除资源">
         <Trash2 size={14} />
       </button>
@@ -796,6 +808,93 @@ function ResourcesPage() {
     return md5
   }, [])
 
+  const showMediaInfo = useCallback(async (item: MediaStreamItem) => {
+    const itemKey = getItemKey(item)
+    const mediaLabel = item.mediaType === 'image' ? '图片' : '视频'
+    const baseRows: Array<{ label: string; value: string }> = [
+      { label: '资源类型', value: mediaLabel },
+      { label: '会话 ID', value: formatInfoValue(item.sessionId) },
+      { label: '消息 LocalId', value: formatInfoValue(item.localId) },
+      { label: '消息时间', value: formatTimeLabel(item.createTime) },
+      { label: '发送方', value: formatInfoValue(item.senderUsername) },
+      { label: '是否我发送', value: item.isSend === 1 ? '是' : (item.isSend === 0 ? '否' : '-') }
+    ]
+
+    setDialog({
+      mode: 'info',
+      title: `${mediaLabel}信息`,
+      infoRows: [...baseRows, { label: '状态', value: '正在读取缓存信息...' }],
+      confirmText: '关闭',
+      onConfirm: null
+    })
+
+    try {
+      if (item.mediaType === 'image') {
+        const resolved = await window.electronAPI.image.resolveCache({
+          sessionId: item.sessionId,
+          imageMd5: normalizeMediaToken(item.imageMd5) || undefined,
+          imageDatName: getSafeImageDatName(item) || undefined,
+          createTime: Number(item.createTime || 0) || undefined,
+          preferFilePath: true,
+          hardlinkOnly: true,
+          allowCacheIndex: true,
+          suppressEvents: true
+        })
+        const previewPath = previewPathMapRef.current[itemKey] || previewPatchRef.current[itemKey] || ''
+        const cachePath = String(resolved?.localPath || previewPath || '').trim()
+        const rows: Array<{ label: string; value: string }> = [
+          ...baseRows,
+          { label: 'imageMd5', value: formatInfoValue(normalizeMediaToken(item.imageMd5)) },
+          { label: 'imageDatName', value: formatInfoValue(getSafeImageDatName(item)) },
+          { label: '列表预览路径', value: formatInfoValue(previewPath) },
+          { label: '缓存命中', value: resolved?.success && cachePath ? '是' : '否' },
+          { label: '缓存路径', value: formatInfoValue(cachePath) },
+          { label: '缓存可更新', value: resolved?.hasUpdate ? '是' : '否' },
+          { label: '缓存状态', value: resolved?.success ? '可用' : formatInfoValue(resolved?.error || resolved?.failureKind || '未命中') }
+        ]
+        setDialog({
+          mode: 'info',
+          title: '图片信息',
+          infoRows: rows,
+          confirmText: '关闭',
+          onConfirm: null
+        })
+        return
+      }
+
+      const resolvedMd5 = await resolveItemVideoMd5(item)
+      const videoInfo = resolvedMd5
+        ? await window.electronAPI.video.getVideoInfo(resolvedMd5, { includePoster: true, posterFormat: 'fileUrl' })
+        : null
+      const posterPath = videoPosterMapRef.current[itemKey] || posterPatchRef.current[itemKey] || ''
+      const rows: Array<{ label: string; value: string }> = [
+        ...baseRows,
+        { label: 'videoMd5(消息)', value: formatInfoValue(normalizeMediaToken(item.videoMd5)) },
+        { label: 'videoMd5(解析)', value: formatInfoValue(resolvedMd5) },
+        { label: '视频文件存在', value: videoInfo?.success && videoInfo.exists ? '是' : '否' },
+        { label: '视频路径', value: formatInfoValue(videoInfo?.videoUrl) },
+        { label: '同名封面路径', value: formatInfoValue(videoInfo?.coverUrl) },
+        { label: '列表封面路径', value: formatInfoValue(posterPath) },
+        { label: '视频状态', value: videoInfo?.success ? '可用' : formatInfoValue(videoInfo?.error || '未找到') }
+      ]
+      setDialog({
+        mode: 'info',
+        title: '视频信息',
+        infoRows: rows,
+        confirmText: '关闭',
+        onConfirm: null
+      })
+    } catch (e) {
+      setDialog({
+        mode: 'info',
+        title: `${mediaLabel}信息`,
+        infoRows: [...baseRows, { label: '读取失败', value: formatInfoValue(String(e)) }],
+        confirmText: '关闭',
+        onConfirm: null
+      })
+    }
+  }, [resolveItemVideoMd5])
+
   const resolveVideoPoster = useCallback(async (item: MediaStreamItem) => {
     if (item.mediaType !== 'video') return
     const itemKey = getItemKey(item)
@@ -815,7 +914,7 @@ function ResourcesPage() {
         attemptedVideoPosterKeysRef.current.add(itemKey)
         return
       }
-      const poster = String(info.coverUrl || info.thumbUrl || '')
+      const poster = String(info.coverUrl || '')
       if (!poster) {
         attemptedVideoPosterKeysRef.current.add(itemKey)
         return
@@ -1371,6 +1470,7 @@ function ResourcesPage() {
                   decrypting={decryptingKeys.has(itemKey)}
                   onToggleSelect={toggleSelect}
                   onDelete={deleteOne}
+                  onShowInfo={showMediaInfo}
                   onImagePreviewAction={onImagePreviewAction}
                   onUpdateImageQuality={updateImageQuality}
                   onOpenVideo={openVideo}
@@ -1388,7 +1488,20 @@ function ResourcesPage() {
         <div className="resource-dialog-mask">
           <div className="resource-dialog" role="dialog" aria-modal="true" aria-label={dialog.title}>
             <header className="dialog-header">{dialog.title}</header>
-            <div className="dialog-body">{dialog.message}</div>
+            <div className="dialog-body">
+              {dialog.mode === 'info' ? (
+                <div className="dialog-info-list">
+                  {(dialog.infoRows || []).map((row, idx) => (
+                    <div className="dialog-info-row" key={`${row.label}-${idx}`}>
+                      <span className="info-label">{row.label}</span>
+                      <span className="info-value" title={row.value}>{row.value}</span>
+                    </div>
+                  ))}
+                </div>
+              ) : (
+                dialog.message
+              )}
+            </div>
             <footer className="dialog-actions">
               {dialog.mode === 'confirm' && (
                 <button type="button" className="dialog-btn ghost" onClick={closeDialog}>
diff --git a/src/types/electron.d.ts b/src/types/electron.d.ts
index 40ce92a..30b6126 100644
--- a/src/types/electron.d.ts
+++ b/src/types/electron.d.ts
@@ -985,6 +985,7 @@ export interface ElectronAPI {
       pendingSessionIds?: string[]
       successSessionIds?: string[]
       failedSessionIds?: string[]
+      sessionOutputPaths?: Record<string, string>
       error?: string
     }>
     exportSession: (sessionId: string, outputPath: string, options: ExportOptions) => Promise<{
diff --git a/src/types/sns.ts b/src/types/sns.ts
index b075de6..073c3ae 100644
--- a/src/types/sns.ts
+++ b/src/types/sns.ts
@@ -68,4 +68,5 @@ export interface SnsLinkCardData {
     title: string
     url: string
     thumb?: string
+    thumbKey?: string
 }