diff --git a/README.md b/README.md
index cc237f2..be9a0d8 100644
--- a/README.md
+++ b/README.md
@@ -284,18 +284,21 @@ git clone https://github.com/Youzini-afk/ST-Bionic-Memory-Ecology.git st-bme
 ```
 ST-BME/
 ├── index.js           # 主入口：事件绑定、流程调度、历史恢复
+├── bme-db.js          # IndexedDB(Dexie) 持久化层（本地主存储）
+├── bme-sync.js        # 跨设备同步（/user/files/ 镜像 + 合并）
+├── bme-chat-manager.js# chatId -> BmeDatabase 生命周期管理
+├── lib/dexie.min.js   # vendored Dexie（浏览器端动态注入加载）
 ├── graph.js           # 图数据模型、序列化、版本迁移
 ├── extractor.js       # 记忆提取、概要、反思
 ├── retriever.js       # 向量候选、图扩散、混合评分、召回
 ├── injector.js        # 召回结果格式化注入
 ├── runtime-state.js   # 运行时状态：楼层 hash、dirty 标记、恢复日志
-├── recall-persistence.js # 持久召回记录（message.extra.bme_recall）
-├── recall-message-ui.js # 消息级召回卡片 UI（子图渲染 + 侧边栏编辑）
+├── recall-persistence.js # 持久召回记录（message.extra.bme_recall，不变）
+├── recall-message-ui.js # 消息级召回卡片 UI（子图渲染 + 侧边栏编辑，不变）
 ├── vector-index.js    # 向量索引管理（backend / direct 双模式）
 ├── embedding.js       # 直连 Embedding API 封装
 ├── llm.js             # 记忆 LLM 请求封装
 ├── compressor.js      # 层级压缩与遗忘
-├── evolution.js       # 记忆进化（A-MEM 风格）
 ├── diffusion.js       # 图扩散算法
 ├── dynamics.js        # 动态调节（重要度衰减等）
 ├── schema.js          # 节点类型定义
@@ -310,19 +313,40 @@ ST-BME/
 
 ### 数据存储
 
-- **图谱数据** → `chat_metadata.st_bme_graph`（跟随聊天保存）
+- **图谱主存储（本地优先）** → `IndexedDB`（Dexie）
+  - DB 名固定：`STBME_{chatId}`
+  - 运行时主读取路径：优先 IndexedDB
+- **跨设备同步镜像** → SillyTavern 文件 API `/user/files/`
+  - 文件名固定：`ST-BME_sync_{sanitizedChatId}.json`
+  - 冲突合并：`updatedAt` 新者胜；tombstone `deletedAt` 优先；`lastProcessedFloor/extractionCount` 取 `max`
+  - `meta` 为同步 JSON 顶层首字段，`revision` 全程单调递增
+- **兼容兜底（迁移窗口）** → `chat_metadata.st_bme_graph`
+  - 仅用于 legacy 兼容与迁移，不再是主路径
+- **墓碑（tombstones）** → 保留期固定 30 天
 - **插件设置** → SillyTavern 的 `extension_settings.st_bme`
 - **向量索引** → 后端模式走酒馆 API；直连模式存在节点内
-- **召回持久注入** → `chat[x].extra.bme_recall`（消息级）
+- **召回持久注入（不变）** → `chat[x].extra.bme_recall`（消息级）
+
+### 兼容迁移策略（legacy metadata → IndexedDB）
+
+- 触发：聊天加载/切换后，若目标 `STBME_{chatId}` 为空且存在 legacy `chat_metadata` 图谱
+- 行为：自动一次性迁移到 IndexedDB，并立即尝试同步到 `/user/files/`
+- 幂等：
+  - 若 `migrationCompletedAt > 0`，跳过
+  - 若 IndexedDB 已非空，跳过
+- 迁移记录：
+  - `migrationCompletedAt`
+  - `migrationSource`（默认 `chat_metadata`）
+  - `legacyRetentionUntil`（30 天）
 
 ### 事件挂载
 
 | SillyTavern 事件 | 做什么 |
 |---|---|
-| `CHAT_CHANGED` | 加载对应聊天的图谱 |
+| `CHAT_CHANGED` | IndexedDB 优先加载 + 自动同步 |
 | `GENERATION_AFTER_COMMANDS` | AI 回复后提取记忆 |
 | `GENERATE_BEFORE_COMBINE_PROMPTS` | 生成前召回并注入 |
-| `MESSAGE_RECEIVED` | 保存图谱状态 |
+| `MESSAGE_RECEIVED` | 触发图谱持久化（IndexedDB 主写） |
 | 删除 / 编辑 / Swipe | 触发历史变动检测与恢复 |
 
 ### 召回流水线
diff --git a/index.js b/index.js
index a848e02..f3dd7c5 100644
--- a/index.js
+++ b/index.js
@@ -3836,6 +3836,7 @@ function loadGraphFromChat(options = {}) {
     attemptIndex = 0,
     expectedChatId = "",
     source = "direct-load",
+    allowMetadataFallback = true,
   } = options;
   const context = getContext();
   const chatIdentity = resolveCurrentChatIdentity(context);
@@ -3861,28 +3862,7 @@ function loadGraphFromChat(options = {}) {
     };
   }
 
-  if (chatId) {
-    const cachedSnapshot = readCachedIndexedDbSnapshot(chatId);
-    if (isIndexedDbSnapshotMeaningful(cachedSnapshot)) {
-      const cachedResult = applyIndexedDbSnapshotToRuntime(chatId, cachedSnapshot, {
-        source: `${source}:indexeddb-cache`,
-        attemptIndex,
-      });
-      if (cachedResult?.loaded) {
-        clearPendingGraphLoadRetry();
-        return cachedResult;
-      }
-    }
-
-    scheduleIndexedDbGraphProbe(chatId, {
-      source: `${source}:indexeddb-probe`,
-      attemptIndex,
-      allowOverride: false,
-    });
-  }
-
   if (!chatId) {
-    const shouldRetry = attemptIndex < GRAPH_LOAD_RETRY_DELAYS_MS.length;
     if (chatIdentity.hasLikelySelectedChat) {
       currentGraph = normalizeGraphRuntimeState(createEmptyGraph(), "");
       extractionCount = 0;
@@ -3891,63 +3871,46 @@ function loadGraphFromChat(options = {}) {
       lastInjectionContent = "";
       runtimeStatus = createUiStatus(
         "图谱加载中",
-        "正在等待当前聊天会话 ID 与元数据就绪",
-        shouldRetry ? "running" : "warning",
+        "正在等待当前聊天会话 ID 就绪",
+        "running",
       );
       lastExtractionStatus = createUiStatus(
         "待命",
-        shouldRetry
-          ? "正在等待当前聊天会话 ID 就绪"
-          : "当前聊天会话 ID 长时间未就绪，已暂停修改图谱",
-        shouldRetry ? "idle" : "warning",
+        "正在等待当前聊天会话 ID 就绪",
+        "idle",
       );
       lastVectorStatus = createUiStatus(
         "待命",
-        shouldRetry
-          ? "正在等待当前聊天会话 ID 就绪"
-          : "当前聊天会话 ID 长时间未就绪，已暂停修改图谱",
-        shouldRetry ? "idle" : "warning",
+        "正在等待当前聊天会话 ID 就绪",
+        "idle",
       );
       lastRecallStatus = createUiStatus(
         "待命",
-        shouldRetry
-          ? "正在等待当前聊天会话 ID 就绪"
-          : "当前聊天会话 ID 长时间未就绪，已暂停图谱写回",
-        shouldRetry ? "idle" : "warning",
+        "正在等待当前聊天会话 ID 就绪",
+        "idle",
       );
-      applyGraphLoadState(
-        shouldRetry ? GRAPH_LOAD_STATES.LOADING : GRAPH_LOAD_STATES.BLOCKED,
-        {
-          chatId: "",
-          reason: shouldRetry ? "chat-id-missing" : "chat-id-timeout",
-          attemptIndex,
-          revision: 0,
-          lastPersistedRevision: 0,
-          queuedPersistRevision: 0,
-          queuedPersistChatId: "",
-          pendingPersist: false,
-          shadowSnapshotUsed: false,
-          shadowSnapshotRevision: 0,
-          shadowSnapshotUpdatedAt: "",
-          shadowSnapshotReason: "",
-          writesBlocked: true,
-        },
-      );
-      if (shouldRetry) {
-        scheduleGraphLoadRetry("", "chat-id-missing", attemptIndex, {
-          allowPendingChat: true,
-        });
-      } else {
-        clearPendingGraphLoadRetry();
-      }
+      applyGraphLoadState(GRAPH_LOAD_STATES.LOADING, {
+        chatId: "",
+        reason: "chat-id-missing",
+        attemptIndex,
+        revision: 0,
+        lastPersistedRevision: 0,
+        queuedPersistRevision: 0,
+        queuedPersistChatId: "",
+        pendingPersist: false,
+        shadowSnapshotUsed: false,
+        shadowSnapshotRevision: 0,
+        shadowSnapshotUpdatedAt: "",
+        shadowSnapshotReason: "",
+        dbReady: false,
+        writesBlocked: true,
+      });
       refreshPanelLiveState();
       return {
         success: false,
         loaded: false,
-        loadState: shouldRetry
-          ? GRAPH_LOAD_STATES.LOADING
-          : GRAPH_LOAD_STATES.BLOCKED,
-        reason: shouldRetry ? "chat-id-missing" : "chat-id-timeout",
+        loadState: GRAPH_LOAD_STATES.LOADING,
+        reason: "chat-id-missing",
         chatId: "",
         attemptIndex,
       };
@@ -3978,6 +3941,7 @@ function loadGraphFromChat(options = {}) {
       shadowSnapshotReason: "",
       writesBlocked: true,
     });
+
     refreshPanelLiveState();
     return {
       success: false,
@@ -3989,351 +3953,51 @@ function loadGraphFromChat(options = {}) {
     };
   }
 
-  const hasChatMetadata =
-    context?.chatMetadata &&
-    typeof context.chatMetadata === "object" &&
-    !Array.isArray(context.chatMetadata);
-  const metadataReady = isHostChatMetadataReady(context);
-  const savedData = hasChatMetadata
-    ? context.chatMetadata[GRAPH_METADATA_KEY]
-    : undefined;
-  const hasOfficialGraph = savedData != null && savedData !== "";
-  const shadowSnapshot = readGraphShadowSnapshot(chatId);
-  const shouldRetry = attemptIndex < GRAPH_LOAD_RETRY_DELAYS_MS.length;
-
-  if (hasOfficialGraph) {
-    const officialGraph = cloneGraphForPersistence(
-      normalizeGraphRuntimeState(deserializeGraph(savedData), chatId),
-      chatId,
-    );
-    const officialRevision = Math.max(
-      1,
-      getGraphPersistedRevision(officialGraph),
-    );
-    const metadataIntegrity = getChatMetadataIntegrity(context);
-
-    if (shouldPreferShadowSnapshotOverOfficial(officialGraph, shadowSnapshot)) {
+  const cachedSnapshot = readCachedIndexedDbSnapshot(chatId);
+  if (isIndexedDbSnapshotMeaningful(cachedSnapshot)) {
+    const cachedResult = applyIndexedDbSnapshotToRuntime(chatId, cachedSnapshot, {
+      source: `${source}:indexeddb-cache`,
+      attemptIndex,
+    });
+    if (cachedResult?.loaded) {
       clearPendingGraphLoadRetry();
-      currentGraph = cloneGraphForPersistence(
-        normalizeGraphRuntimeState(
-          deserializeGraph(shadowSnapshot.serializedGraph),
-          chatId,
-        ),
+      return cachedResult;
+    }
+  }
+
+  const savedData = allowMetadataFallback
+    ? context?.chatMetadata?.[GRAPH_METADATA_KEY]
+    : undefined;
+  if (savedData != null && savedData !== "") {
+    try {
+      const officialGraph = cloneGraphForPersistence(
+        normalizeGraphRuntimeState(deserializeGraph(savedData), chatId),
         chatId,
       );
-      extractionCount = Number.isFinite(
-        currentGraph?.historyState?.extractionCount,
-      )
+      const officialRevision = Math.max(1, getGraphPersistedRevision(officialGraph));
+
+      clearPendingGraphLoadRetry();
+      currentGraph = officialGraph;
+      extractionCount = Number.isFinite(currentGraph?.historyState?.extractionCount)
         ? currentGraph.historyState.extractionCount
         : 0;
       lastExtractedItems = [];
       updateLastRecalledItems(currentGraph.lastRecallResult || []);
       lastInjectionContent = "";
-      runtimeStatus = createUiStatus(
-        "待命",
-        "已恢复本次会话里较新的图谱，正在补写正式聊天元数据",
-        "warning",
-      );
-      lastExtractionStatus = createUiStatus(
-        "待命",
-        "检测到本次会话里有更新的图谱快照，正在补写正式元数据",
-        "warning",
-      );
+      runtimeStatus = createUiStatus("待命", "已从兼容 metadata 加载图谱", "idle");
+      lastExtractionStatus = createUiStatus("待命", "已加载聊天图谱，等待下一次提取", "idle");
       lastVectorStatus = createUiStatus(
         "待命",
-        "检测到本次会话里有更新的图谱快照，正在补写正式元数据",
-        "warning",
-      );
-      lastRecallStatus = createUiStatus(
-        "待命",
-        "检测到本次会话里有更新的图谱快照，正在补写正式元数据",
-        "warning",
+        currentGraph.vectorIndexState?.lastWarning || "已加载聊天图谱，等待下一次向量任务",
+        "idle",
       );
+      lastRecallStatus = createUiStatus("待命", "已加载聊天图谱，等待下一次召回", "idle");
       applyGraphLoadState(GRAPH_LOAD_STATES.LOADED, {
         chatId,
-        reason: "shadow-snapshot-newer-than-official",
+        reason: `${source}:metadata-compat`,
         attemptIndex,
-        revision: Math.max(shadowSnapshot.revision || 0, 1),
+        revision: officialRevision,
         lastPersistedRevision: officialRevision,
-        queuedPersistRevision: Math.max(shadowSnapshot.revision || 0, 1),
-        pendingPersist: true,
-        shadowSnapshotUsed: true,
-        shadowSnapshotRevision: Math.max(shadowSnapshot.revision || 0, 1),
-        shadowSnapshotUpdatedAt: shadowSnapshot.updatedAt,
-        shadowSnapshotReason: shadowSnapshot.reason,
-        writesBlocked: false,
-      });
-      updateGraphPersistenceState({
-        metadataIntegrity,
-        queuedPersistMode: "immediate",
-        queuedPersistRotateIntegrity: false,
-        queuedPersistReason: "shadow-snapshot-newer-than-official",
-        storagePrimary: "metadata",
-        storageMode: "metadata",
-        indexedDbRevision: Math.max(graphPersistenceState.indexedDbRevision || 0, officialRevision),
-        indexedDbLastError: "",
-      });
-      const persistResult = maybeFlushQueuedGraphPersist(
-        "shadow-snapshot-newer-than-official",
-      );
-      refreshPanelLiveState();
-      return {
-        success: Boolean(persistResult.saved),
-        loaded: true,
-        loadState: GRAPH_LOAD_STATES.LOADED,
-        reason: "shadow-snapshot-newer-than-official",
-        chatId,
-        attemptIndex,
-        shadowSnapshotUsed: true,
-      };
-    }
-
-    clearPendingGraphLoadRetry();
-    currentGraph = officialGraph;
-    extractionCount = Number.isFinite(
-      currentGraph?.historyState?.extractionCount,
-    )
-      ? currentGraph.historyState.extractionCount
-      : 0;
-    lastExtractedItems = [];
-    updateLastRecalledItems(currentGraph.lastRecallResult || []);
-    lastInjectionContent = "";
-    runtimeStatus = createUiStatus(
-      "待命",
-      "已加载聊天图谱，等待下一次任务",
-      "idle",
-    );
-    lastExtractionStatus = createUiStatus(
-      "待命",
-      "已加载聊天图谱，等待下一次提取",
-      "idle",
-    );
-    lastVectorStatus = createUiStatus(
-      "待命",
-      currentGraph.vectorIndexState?.lastWarning ||
-        "已加载聊天图谱，等待下一次向量任务",
-      "idle",
-    );
-    lastRecallStatus = createUiStatus(
-      "待命",
-      "已加载聊天图谱，等待下一次召回",
-      "idle",
-    );
-    applyGraphLoadState(GRAPH_LOAD_STATES.LOADED, {
-      chatId,
-      reason: source,
-      attemptIndex,
-      revision: officialRevision,
-      lastPersistedRevision: officialRevision,
-      queuedPersistRevision: 0,
-      queuedPersistChatId: "",
-      pendingPersist: false,
-      shadowSnapshotUsed: false,
-      shadowSnapshotRevision: 0,
-      shadowSnapshotUpdatedAt: "",
-      shadowSnapshotReason: "",
-      writesBlocked: false,
-    });
-    updateGraphPersistenceState({
-      metadataIntegrity,
-      lastPersistMode: "",
-      queuedPersistMode: "",
-      queuedPersistRotateIntegrity: false,
-      queuedPersistReason: "",
-      storagePrimary: "metadata",
-      storageMode: "metadata",
-      indexedDbLastError: "",
-    });
-    removeGraphShadowSnapshot(chatId);
-
-    console.log("[ST-BME] 从聊天数据加载图谱:", {
-      chatId,
-      source,
-      attemptIndex,
-      ...getGraphStats(currentGraph),
-    });
-    refreshPanelLiveState();
-    return {
-      success: true,
-      loaded: true,
-      loadState: GRAPH_LOAD_STATES.LOADED,
-      reason: source,
-      chatId,
-      attemptIndex,
-      shadowSnapshotUsed: false,
-    };
-  }
-
-  if (shadowSnapshot) {
-    currentGraph = normalizeGraphRuntimeState(
-      deserializeGraph(shadowSnapshot.serializedGraph),
-      chatId,
-    );
-    extractionCount = Number.isFinite(
-      currentGraph?.historyState?.extractionCount,
-    )
-      ? currentGraph.historyState.extractionCount
-      : 0;
-    lastExtractedItems = [];
-    updateLastRecalledItems(currentGraph.lastRecallResult || []);
-    lastInjectionContent = "";
-    runtimeStatus = createUiStatus("待命", "已从本次会话临时恢复图谱", "idle");
-    lastExtractionStatus = createUiStatus(
-      "待命",
-      "图谱处于临时恢复状态，等待正式元数据",
-      "warning",
-    );
-    lastVectorStatus = createUiStatus(
-      "待命",
-      "图谱处于临时恢复状态，等待正式元数据",
-      "warning",
-    );
-    lastRecallStatus = createUiStatus(
-      "待命",
-      "图谱处于临时恢复状态，等待正式元数据",
-      "warning",
-    );
-
-    if (metadataReady) {
-      applyGraphLoadState(GRAPH_LOAD_STATES.LOADED, {
-        chatId,
-        reason: "shadow-snapshot-promoted",
-        attemptIndex,
-        revision: Math.max(shadowSnapshot.revision || 0, 1),
-        lastPersistedRevision: 0,
-        queuedPersistRevision: Math.max(shadowSnapshot.revision || 0, 1),
-        pendingPersist: true,
-        shadowSnapshotUsed: true,
-        shadowSnapshotRevision: Math.max(shadowSnapshot.revision || 0, 1),
-        shadowSnapshotUpdatedAt: shadowSnapshot.updatedAt,
-        shadowSnapshotReason: shadowSnapshot.reason,
-        writesBlocked: false,
-      });
-      updateGraphPersistenceState({
-        metadataIntegrity: getChatMetadataIntegrity(context),
-        queuedPersistMode: "immediate",
-        queuedPersistRotateIntegrity: false,
-        queuedPersistReason: "shadow-snapshot-promoted",
-        storagePrimary: "metadata",
-        storageMode: "metadata",
-        indexedDbLastError: "",
-      });
-      const persistResult = maybeFlushQueuedGraphPersist(
-        "shadow-snapshot-promoted",
-      );
-      refreshPanelLiveState();
-      return {
-        success: Boolean(persistResult.saved),
-        loaded: true,
-        loadState: GRAPH_LOAD_STATES.LOADED,
-        reason: "shadow-snapshot-promoted",
-        chatId,
-        attemptIndex,
-        shadowSnapshotUsed: true,
-      };
-    }
-
-    const shadowState = shouldRetry
-      ? GRAPH_LOAD_STATES.SHADOW_RESTORED
-      : GRAPH_LOAD_STATES.BLOCKED;
-    applyGraphLoadState(shadowState, {
-      chatId,
-      reason: shouldRetry
-        ? "shadow-snapshot-restored"
-        : "shadow-snapshot-blocked",
-      attemptIndex,
-      revision: Math.max(shadowSnapshot.revision || 0, 1),
-      lastPersistedRevision: 0,
-      queuedPersistRevision: Math.max(shadowSnapshot.revision || 0, 1),
-      pendingPersist: true,
-      shadowSnapshotUsed: true,
-      shadowSnapshotRevision: Math.max(shadowSnapshot.revision || 0, 1),
-      shadowSnapshotUpdatedAt: shadowSnapshot.updatedAt,
-      shadowSnapshotReason: shadowSnapshot.reason,
-      writesBlocked: true,
-    });
-    updateGraphPersistenceState({
-      queuedPersistMode: "immediate",
-      queuedPersistRotateIntegrity: false,
-      queuedPersistReason: shouldRetry
-        ? "shadow-snapshot-restored"
-        : "shadow-snapshot-blocked",
-      storagePrimary: "metadata",
-      storageMode: "metadata",
-      indexedDbLastError: "",
-    });
-    if (shouldRetry) {
-      scheduleGraphLoadRetry(
-        chatId,
-        hasChatMetadata
-          ? "official-graph-missing-shadow"
-          : "chat-metadata-missing-shadow",
-        attemptIndex,
-      );
-    } else {
-      clearPendingGraphLoadRetry();
-    }
-    refreshPanelLiveState();
-    return {
-      success: false,
-      loaded: false,
-      loadState: shadowState,
-      reason: graphPersistenceState.reason,
-      chatId,
-      attemptIndex,
-      shadowSnapshotUsed: true,
-    };
-  }
-
-  currentGraph = normalizeGraphRuntimeState(createEmptyGraph(), chatId);
-  extractionCount = 0;
-  lastExtractedItems = [];
-  lastRecalledItems = [];
-  lastInjectionContent = "";
-
-  if (!metadataReady) {
-    runtimeStatus = createUiStatus(
-      "待命",
-      shouldRetry
-        ? "正在加载当前聊天图谱，暂不写回图谱元数据"
-        : "聊天元数据未就绪，已暂停图谱写回",
-      shouldRetry ? "idle" : "warning",
-    );
-    lastExtractionStatus = createUiStatus(
-      "待命",
-      shouldRetry
-        ? "正在等待聊天图谱元数据加载"
-        : "聊天元数据未就绪，暂不允许修改图谱",
-      shouldRetry ? "idle" : "warning",
-    );
-    lastVectorStatus = createUiStatus(
-      "待命",
-      shouldRetry
-        ? "正在等待聊天图谱元数据加载"
-        : "聊天元数据未就绪，暂不允许修改图谱",
-      shouldRetry ? "idle" : "warning",
-    );
-    lastRecallStatus = createUiStatus(
-      "待命",
-      shouldRetry
-        ? "正在等待聊天图谱元数据加载"
-        : "聊天元数据未就绪，图谱处于保护状态",
-      shouldRetry ? "idle" : "warning",
-    );
-    applyGraphLoadState(
-      shouldRetry ? GRAPH_LOAD_STATES.LOADING : GRAPH_LOAD_STATES.BLOCKED,
-      {
-        chatId,
-        reason: hasChatMetadata
-          ? shouldRetry
-            ? "graph-metadata-missing"
-            : "graph-metadata-timeout"
-          : shouldRetry
-            ? "chat-metadata-missing"
-            : "chat-metadata-timeout",
-        attemptIndex,
-        revision: 0,
-        lastPersistedRevision: 0,
         queuedPersistRevision: 0,
         queuedPersistChatId: "",
         pendingPersist: false,
@@ -4341,72 +4005,66 @@ function loadGraphFromChat(options = {}) {
         shadowSnapshotRevision: 0,
         shadowSnapshotUpdatedAt: "",
         shadowSnapshotReason: "",
-        writesBlocked: true,
-      },
-    );
-    if (shouldRetry) {
-      scheduleGraphLoadRetry(
-        chatId,
-        hasChatMetadata ? "graph-metadata-missing" : "chat-metadata-missing",
+        dbReady: true,
+        writesBlocked: false,
+      });
+      updateGraphPersistenceState({
+        metadataIntegrity: getChatMetadataIntegrity(context),
+        storagePrimary: "metadata",
+        storageMode: "metadata",
+        dbReady: true,
+        indexedDbLastError: "",
+      });
+
+      scheduleIndexedDbGraphProbe(chatId, {
+        source: `${source}:indexeddb-probe`,
         attemptIndex,
-      );
-    } else {
-      clearPendingGraphLoadRetry();
+        allowOverride: true,
+        applyEmptyState: true,
+      });
+
+      refreshPanelLiveState();
+      return {
+        success: true,
+        loaded: true,
+        loadState: GRAPH_LOAD_STATES.LOADED,
+        reason: `${source}:metadata-compat`,
+        chatId,
+        attemptIndex,
+      };
+    } catch (error) {
+      console.warn("[ST-BME] 兼容 metadata 图谱读取失败，将回退 IndexedDB:", error);
     }
-    refreshPanelLiveState();
-    return {
-      success: false,
-      loaded: false,
-      loadState: shouldRetry
-        ? GRAPH_LOAD_STATES.LOADING
-        : GRAPH_LOAD_STATES.BLOCKED,
-      reason: graphPersistenceState.reason,
-      chatId,
-      attemptIndex,
-      shadowSnapshotUsed: false,
-    };
   }
 
-  clearPendingGraphLoadRetry();
-  const confirmedState = GRAPH_LOAD_STATES.EMPTY_CONFIRMED;
-  runtimeStatus = createUiStatus("待命", "当前聊天还没有图谱", "idle");
-  lastExtractionStatus = createUiStatus("待命", "当前聊天尚未执行提取", "idle");
-  lastVectorStatus = createUiStatus("待命", "当前聊天尚未执行向量任务", "idle");
-  lastRecallStatus = createUiStatus("待命", "当前聊天尚未建立记忆图谱", "idle");
-  applyGraphLoadState(confirmedState, {
+  applyGraphLoadState(GRAPH_LOAD_STATES.LOADING, {
     chatId,
-    reason: "metadata-confirmed-empty",
+    reason: `indexeddb-probe-pending:${String(source || "direct-load")}`,
     attemptIndex,
-    revision: 0,
-    lastPersistedRevision: 0,
-    queuedPersistRevision: 0,
-    queuedPersistChatId: "",
-    pendingPersist: false,
-    shadowSnapshotUsed: false,
-    shadowSnapshotRevision: 0,
-    shadowSnapshotUpdatedAt: "",
-    shadowSnapshotReason: "",
-    writesBlocked: false,
+    dbReady: false,
+    writesBlocked: true,
   });
   updateGraphPersistenceState({
-    metadataIntegrity: getChatMetadataIntegrity(context),
-    queuedPersistMode: "",
-    queuedPersistRotateIntegrity: false,
-    queuedPersistReason: "",
-    storagePrimary: "metadata",
-    storageMode: "metadata",
+    storagePrimary: "indexeddb",
+    storageMode: "indexeddb",
+    dbReady: false,
     indexedDbLastError: "",
   });
-  removeGraphShadowSnapshot(chatId);
+  scheduleIndexedDbGraphProbe(chatId, {
+    source: `${source}:indexeddb-probe`,
+    attemptIndex,
+    allowOverride: true,
+    applyEmptyState: true,
+  });
   refreshPanelLiveState();
+
   return {
     success: false,
     loaded: false,
-    loadState: confirmedState,
-    reason: graphPersistenceState.reason,
+    loadState: GRAPH_LOAD_STATES.LOADING,
+    reason: "indexeddb-probe-pending",
     chatId,
     attemptIndex,
-    shadowSnapshotUsed: false,
   };
 }
 
diff --git a/package.json b/package.json
index 4a1b3c4..6f2f781 100644
--- a/package.json
+++ b/package.json
@@ -1,4 +1,14 @@
 {
+  "scripts": {
+    "test:p0": "node tests/p0-regressions.mjs",
+    "test:graph-persistence": "node tests/graph-persistence.mjs",
+    "test:indexeddb-persistence": "node tests/indexeddb-persistence.mjs",
+    "test:indexeddb-sync": "node tests/indexeddb-sync.mjs",
+    "test:indexeddb-migration": "node tests/indexeddb-migration.mjs",
+    "test:indexeddb": "npm run test:indexeddb-persistence && npm run test:indexeddb-sync && npm run test:indexeddb-migration",
+    "test:all": "npm run test:p0 && npm run test:graph-persistence && npm run test:indexeddb",
+    "check": "node --check index.js && node --check bme-db.js && node --check panel.js && node --check ui-status.js && node --check event-binding.js"
+  },
   "dependencies": {
     "triviumdb": "^0.4.41"
   },
diff --git a/tests/graph-persistence.mjs b/tests/graph-persistence.mjs
index 7891a49..78da861 100644
--- a/tests/graph-persistence.mjs
+++ b/tests/graph-persistence.mjs
@@ -651,12 +651,12 @@ result = {
   assert.equal(
     result.loadState,
     "loading",
-    "无 integrity 的占位 metadata 不能视作 ready",
+    "无图谱数据时应进入 IndexedDB 探测等待态",
   );
   assert.equal(
     result.reason,
-    "graph-metadata-missing",
-    "应继续等待正式 graph metadata",
+    "indexeddb-probe-pending",
+    "应继续等待 IndexedDB 探测结果",
   );
   assert.equal(live.writesBlocked, true);
 }
@@ -673,11 +673,11 @@ result = {
     source: "metadata-chatid-ready",
   });
 
-  assert.equal(result.loadState, "empty-confirmed");
+  assert.equal(result.loadState, "loading");
   assert.equal(
     harness.api.getGraphPersistenceLiveState().writesBlocked,
-    false,
-    "当 metadata 提供 chatId/sessionId 等强信号时，可进入 ready-empty",
+    true,
+    "无 IndexedDB 命中时应维持 loading 等待探测结果",
   );
 }
 
@@ -862,11 +862,11 @@ result = {
     source: "shadow-test",
   });
 
-  assert.equal(result.loadState, "shadow-restored");
-  assert.equal(reader.api.getCurrentGraph().nodes.length, 1);
+  assert.equal(result.loadState, "loading");
+  assert.equal(reader.api.getCurrentGraph(), null);
   assert.equal(
     reader.api.getGraphPersistenceLiveState().shadowSnapshotUsed,
-    true,
+    false,
   );
   assert.equal(reader.api.getGraphPersistenceLiveState().writesBlocked, true);
 }
@@ -907,9 +907,9 @@ result = {
     "事件-official",
   );
   assert.equal(
-    reader.api.readGraphShadowSnapshot("chat-official"),
-    null,
-    "正式元数据到位后应清理影子快照",
+    reader.api.readGraphShadowSnapshot("chat-official")?.reason,
+    "stale-shadow",
+    "metadata 兼容加载时保留影子快照仅作为兼容数据，不参与主链路",
   );
 }
 
@@ -944,26 +944,21 @@ result = {
   });
 
   assert.equal(result.loadState, "loaded");
-  assert.equal(result.reason, "shadow-snapshot-newer-than-official");
+  assert.equal(result.reason, "official-older-than-shadow:metadata-compat");
   assert.equal(
     reader.api.getCurrentGraph().nodes[0]?.fields?.title,
-    "事件-shadow-newer",
+    "事件-official-older",
   );
-  assert.equal(reader.runtimeContext.__contextImmediateSaveCalls, 1);
+  assert.equal(reader.runtimeContext.__contextImmediateSaveCalls, 0);
   assert.equal(
     reader.runtimeContext.__chatContext.chatMetadata?.st_bme_graph?.nodes?.[0]
       ?.fields?.title,
-    "事件-shadow-newer",
+    "事件-official-older",
   );
   assert.equal(
-    reader.runtimeContext.__chatContext.chatMetadata?.integrity,
-    "integrity-official-older",
-    "影子快照补写正式图谱时不能改写宿主 metadata.integrity",
-  );
-  assert.equal(
-    reader.api.readGraphShadowSnapshot("chat-shadow-newer"),
-    null,
-    "影子快照补写成功后应被清理",
+    reader.api.readGraphShadowSnapshot("chat-shadow-newer")?.reason,
+    "pagehide-refresh",
+    "metadata 兼容加载后影子快照可保留，但不作为主链路恢复来源",
   );
 }
 
@@ -980,13 +975,13 @@ result = {
   });
   const live = harness.api.getGraphPersistenceLiveState();
 
-  assert.equal(result.loadState, "empty-confirmed");
-  assert.equal(live.writesBlocked, false);
-  assert.equal(live.canWriteToMetadata, true);
-  assert.equal(harness.api.getCurrentGraph().nodes.length, 0);
+  assert.equal(result.loadState, "loading");
+  assert.equal(result.reason, "indexeddb-probe-pending");
+  assert.equal(live.writesBlocked, true);
+  assert.equal(harness.api.getCurrentGraph(), null);
   assert.equal(
     harness.api.readRuntimeDebugSnapshot().graphPersistence?.loadState,
-    "empty-confirmed",
+    "loading",
   );
 }
 
@@ -1017,7 +1012,7 @@ result = {
   assert.equal(
     harness.runtimeContext.__chatContext.chatMetadata?.st_bme_graph,
     undefined,
-    "empty-confirmed 状态下不能把空图被动写回 metadata",
+    "loading 状态下不能把空图被动写回 metadata",
   );
 }
 
@@ -1088,20 +1083,16 @@ result = {
   });
   const live = reader.api.getGraphPersistenceLiveState();
 
-  assert.equal(result.loadState, "loaded");
+  assert.equal(result.loadState, "loading");
   assert.equal(
     reader.runtimeContext.__chatContext.chatMetadata?.st_bme_graph?.nodes
       ?.length,
-    1,
+    undefined,
   );
-  assert.equal(
-    reader.runtimeContext.__chatContext.chatMetadata?.integrity,
-    "meta-ready-promote",
-    "metadata 就绪后提升影子快照时不能改写宿主 metadata.integrity",
-  );
-  assert.equal(reader.runtimeContext.__contextImmediateSaveCalls, 1);
+  assert.equal(reader.runtimeContext.__chatContext.chatMetadata?.integrity, "meta-ready-promote");
+  assert.equal(reader.runtimeContext.__contextImmediateSaveCalls, 0);
   assert.equal(reader.runtimeContext.__contextSaveCalls, 0);
-  assert.equal(live.lastPersistedRevision, 9);
+  assert.equal(live.lastPersistedRevision, 0);
   assert.equal(live.pendingPersist, false);
 }
 
@@ -1255,8 +1246,8 @@ result = {
   runtimeGraph.nodes[0].fields.title = "runtime-shadow-mutated";
   assert.equal(
     persistedGraph.nodes[0].fields.title,
-    "事件-shadow",
-    "shadow 恢复后的运行时修改不能污染已补写 metadata",
+    "事件-official-older",
+    "metadata 兼容加载后的运行时修改不能污染已保存 metadata",
   );
 }