diff --git a/index.js b/index.js
index d46833b..9aebc59 100644
--- a/index.js
+++ b/index.js
@@ -320,6 +320,42 @@ function syncCommitMarkerToPersistenceState(context = getContext()) {
   return marker;
 }
 
+function clearCurrentChatCommitMarker(
+  {
+    context = getContext(),
+    reason = "manual-clear-commit-marker",
+    immediate = true,
+  } = {},
+) {
+  if (!context) {
+    return {
+      cleared: false,
+      reason: "missing-context",
+      saveMode: "",
+      marker: null,
+    };
+  }
+
+  const marker = getChatCommitMarker(context);
+  writeChatMetadataPatch(context, {
+    [GRAPH_COMMIT_MARKER_KEY]: null,
+  });
+  const saveMode = triggerChatMetadataSave(context, { immediate });
+  updateGraphPersistenceState({
+    commitMarker: null,
+    persistMismatchReason: "",
+    lastPersistReason: String(reason || "manual-clear-commit-marker"),
+    lastPersistMode: `commit-marker-clear:${saveMode}`,
+  });
+
+  return {
+    cleared: Boolean(marker),
+    reason: String(reason || "manual-clear-commit-marker"),
+    saveMode,
+    marker: cloneRuntimeDebugValue(marker, null),
+  };
+}
+
 function isAcceptedPersistTier(storageTier = "none") {
   const normalizedTier = String(storageTier || "none").trim().toLowerCase();
   return normalizedTier === "indexeddb" || normalizedTier === "chat-state";
@@ -13700,6 +13736,7 @@ const _cleanupRuntime = () => ({
   },
   clearCachedIndexedDbSnapshot,
   clearAllCachedIndexedDbSnapshots,
+  clearCurrentChatCommitMarker,
   deleteRemoteSyncFile: (chatId) => deleteRemoteSyncFile(chatId, {
     fetch: globalThis.fetch?.bind(globalThis),
     getRequestHeaders: typeof getRequestHeaders === "function" ? getRequestHeaders : undefined,
diff --git a/tests/p0-regressions.mjs b/tests/p0-regressions.mjs
index 6d4adc4..83d1241 100644
--- a/tests/p0-regressions.mjs
+++ b/tests/p0-regressions.mjs
@@ -67,6 +67,7 @@ import {
   shouldRunRecallForTransaction,
 } from "../ui/ui-status.js";
 import {
+  onDeleteCurrentIdbController,
   onManualCompressController,
   onManualEvolveController,
   onManualSleepController,
@@ -2036,6 +2037,93 @@ async function testBackendVectorQueryFailureMarksStateDirty() {
   }
 }
 
+async function testDeleteCurrentIdbClearsCommitMarkerBeforeReload() {
+  const originalIndexedDb = globalThis.indexedDB;
+  const callLog = [];
+  globalThis.indexedDB = {
+    deleteDatabase(name) {
+      callLog.push(["delete-db", String(name || "")]);
+      const request = {
+        onsuccess: null,
+        onerror: null,
+        onblocked: null,
+      };
+      queueMicrotask(() => {
+        request.onsuccess?.();
+      });
+      return request;
+    },
+  };
+
+  try {
+    const runtime = {
+      confirm() {
+        return true;
+      },
+      getCurrentChatId() {
+        return "chat-delete-idb";
+      },
+      buildBmeDbName(chatId) {
+        return `STBME_${chatId}`;
+      },
+      buildRestoreSafetyDbName(chatId) {
+        return `STBME___restore__${chatId}`;
+      },
+      async closeBmeDb(chatId) {
+        callLog.push(["close-db", chatId]);
+      },
+      clearCachedIndexedDbSnapshot(chatId) {
+        callLog.push(["clear-indexeddb-cache", chatId]);
+      },
+      clearCurrentChatCommitMarker(options = {}) {
+        callLog.push([
+          "clear-commit-marker",
+          String(options.reason || ""),
+          options.immediate === true,
+        ]);
+      },
+      syncGraphLoadFromLiveContext(options = {}) {
+        callLog.push([
+          "sync-graph-load",
+          String(options.source || ""),
+          options.force === true,
+        ]);
+      },
+      refreshPanelLiveState() {
+        callLog.push(["refresh-panel"]);
+      },
+      toastr: {
+        success(message) {
+          callLog.push(["toast-success", String(message || "")]);
+        },
+        warning(message) {
+          callLog.push(["toast-warning", String(message || "")]);
+        },
+        error(message) {
+          callLog.push(["toast-error", String(message || "")]);
+        },
+      },
+    };
+
+    const result = await onDeleteCurrentIdbController(runtime);
+    assert.equal(result?.handledToast, true);
+    const clearMarkerIndex = callLog.findIndex(
+      (entry) => entry[0] === "clear-commit-marker",
+    );
+    const syncLoadIndex = callLog.findIndex(
+      (entry) => entry[0] === "sync-graph-load",
+    );
+    assert.ok(clearMarkerIndex >= 0, "删除当前 IDB 后应清理 commit marker");
+    assert.ok(syncLoadIndex >= 0, "删除当前 IDB 后应重新同步图谱加载状态");
+    assert.ok(
+      clearMarkerIndex < syncLoadIndex,
+      "应先清理 commit marker，再触发图谱重探测",
+    );
+  } finally {
+    globalThis.indexedDB = originalIndexedDb;
+  }
+}
+
 async function testCompressTypeAcceptsTopLevelFieldsResult() {
   const graph = createEmptyGraph();
   const typeDef = {
@@ -6778,6 +6866,7 @@ async function testManualSleepExplainsThatItIsLocalOnlyWhenNothingChanges() {
 await testCompressorMigratesEdgesToCompressedNode();
 await testVectorIndexKeepsDirtyOnDirectPartialEmbeddingFailure();
 await testBackendVectorQueryFailureMarksStateDirty();
+await testDeleteCurrentIdbClearsCommitMarkerBeforeReload();
 await testCompressTypeAcceptsTopLevelFieldsResult();
 await testExtractorFailsOnUnknownOperation();
 await testExtractorNormalizesFlatCreateOperation();
diff --git a/ui/ui-actions-controller.js b/ui/ui-actions-controller.js
index 96930c7..e5d199d 100644
--- a/ui/ui-actions-controller.js
+++ b/ui/ui-actions-controller.js
@@ -1193,6 +1193,10 @@ export async function onDeleteCurrentIdbController(runtime) {
       });
     }
     runtime.clearCachedIndexedDbSnapshot?.(chatId);
+    runtime.clearCurrentChatCommitMarker?.({
+      reason: "manual-delete-current-idb",
+      immediate: true,
+    });
     runtime.syncGraphLoadFromLiveContext?.({
       source: "manual-delete-current-idb",
       force: true,
@@ -1245,6 +1249,10 @@ export async function onDeleteAllIdbController(runtime) {
     runtime.clearAllCachedIndexedDbSnapshots?.();
     const activeChatId = runtime.getCurrentChatId?.();
     if (activeChatId) {
+      runtime.clearCurrentChatCommitMarker?.({
+        reason: "manual-delete-all-idb",
+        immediate: true,
+      });
       runtime.syncGraphLoadFromLiveContext?.({
         source: "manual-delete-all-idb",
         force: true,