diff --git a/openviking/storage/queuefs/semantic_processor.py b/openviking/storage/queuefs/semantic_processor.py
index cf164177..16ec2291 100644
--- a/openviking/storage/queuefs/semantic_processor.py
+++ b/openviking/storage/queuefs/semantic_processor.py
@@ -463,6 +463,13 @@ async def sync_dir(root_dir: str, target_dir: str) -> None:
             root_files, root_dirs = await list_children(root_dir)
             target_files, target_dirs = await list_children(target_dir)
 
+            try:
+                await viking_fs._mv_vector_store_l0_l1(root_dir, target_dir, ctx=ctx)
+            except Exception as e:
+                logger.error(
+                    f"[SyncDiff] Failed to move L0/L1 index: {root_dir} -> {target_dir}, error={e}"
+                )
+
             file_names = set(root_files.keys()) | set(target_files.keys())
             for name in sorted(file_names):
                 root_file = root_files.get(name)
diff --git a/openviking/storage/viking_fs.py b/openviking/storage/viking_fs.py
index 42e5e0f2..c25c251b 100644
--- a/openviking/storage/viking_fs.py
+++ b/openviking/storage/viking_fs.py
@@ -1210,6 +1210,7 @@ async def _update_vector_store_uris(
         old_base: str,
         new_base: str,
         ctx: Optional[RequestContext] = None,
+        levels: Optional[List[int]] = None,
     ) -> None:
         """Update URIs in vector store (when moving files).
 
@@ -1232,11 +1233,71 @@ async def _update_vector_store_uris(
                     uri=uri,
                     new_uri=new_uri,
                     new_parent_uri=new_parent_uri,
+                    levels=levels,
                 )
                 logger.debug(f"[VikingFS] Updated URI: {uri} -> {new_uri}")
             except Exception as e:
                 logger.warning(f"[VikingFS] Failed to update {uri} in vector store: {e}")
 
+    async def _mv_vector_store_l0_l1(
+        self,
+        old_uri: str,
+        new_uri: str,
+        ctx: Optional[RequestContext] = None,
+    ) -> None:
+        from openviking.storage.errors import LockAcquisitionError, ResourceBusyError
+        from openviking.storage.transaction import LockContext, get_lock_manager
+
+        self._ensure_access(old_uri, ctx)
+        self._ensure_access(new_uri, ctx)
+
+        real_ctx = self._ctx_or_default(ctx)
+        old_dir = VikingURI.normalize(old_uri).rstrip("/")
+        new_dir = VikingURI.normalize(new_uri).rstrip("/")
+        if old_dir == new_dir:
+            return
+
+        for uri in (old_dir, new_dir):
+            if uri.endswith(("/.abstract.md", "/.overview.md")):
+                raise ValueError(f"mv_vector_store expects directory URIs, got: {uri}")
+
+        try:
+            old_stat = await self.stat(old_dir, ctx=real_ctx)
+        except Exception as e:
+            raise FileNotFoundError(f"mv_vector_store old_uri not found: {old_dir}") from e
+        try:
+            new_stat = await self.stat(new_dir, ctx=real_ctx)
+        except Exception as e:
+            raise FileNotFoundError(f"mv_vector_store new_uri not found: {new_dir}") from e
+
+        if not (isinstance(old_stat, dict) and old_stat.get("isDir", False)):
+            raise ValueError(f"mv_vector_store expects old_uri to be a directory: {old_dir}")
+        if not (isinstance(new_stat, dict) and new_stat.get("isDir", False)):
+            raise ValueError(f"mv_vector_store expects new_uri to be a directory: {new_dir}")
+
+        old_path = self._uri_to_path(old_dir, ctx=real_ctx)
+        new_path = self._uri_to_path(new_dir, ctx=real_ctx)
+        dst_parent = new_path.rsplit("/", 1)[0] if "/" in new_path else new_path
+
+        try:
+            async with LockContext(
+                get_lock_manager(),
+                [old_path],
+                lock_mode="mv",
+                mv_dst_parent_path=dst_parent,
+                src_is_dir=True,
+            ):
+                await self._update_vector_store_uris(
+                    uris=[old_dir],
+                    old_base=old_dir,
+                    new_base=new_dir,
+                    ctx=real_ctx,
+                    levels=[0, 1],
+                )
+
+        except LockAcquisitionError:
+            raise ResourceBusyError(f"Resource is being processed: {old_dir}")
+
     def _get_vector_store(self) -> Optional["VikingVectorIndexBackend"]:
         """Get vector store instance."""
         return self.vector_store
diff --git a/openviking/storage/viking_vector_index_backend.py b/openviking/storage/viking_vector_index_backend.py
index 29026d49..5a8b06e8 100644
--- a/openviking/storage/viking_vector_index_backend.py
+++ b/openviking/storage/viking_vector_index_backend.py
@@ -829,14 +829,22 @@ async def update_uri_mapping(
         uri: str,
         new_uri: str,
         new_parent_uri: str,
+        levels: Optional[List[int]] = None,
     ) -> bool:
         import hashlib
 
-        records = await self.filter(
-            filter=And([Eq("uri", uri), Eq("account_id", ctx.account_id)]),
-            limit=100,
-            ctx=ctx,
-        )
+        conds: List[FilterExpr] = [Eq("uri", uri), Eq("account_id", ctx.account_id)]
+        if levels:
+            conds.append(In("level", levels))
+        if ctx.role == Role.USER and uri.startswith(("viking://user/", "viking://agent/")):
+            owner_space = (
+                ctx.user.user_space_name()
+                if uri.startswith("viking://user/")
+                else ctx.user.agent_space_name()
+            )
+            conds.append(Eq("owner_space", owner_space))
+
+        records = await self.filter(filter=And(conds), limit=100, ctx=ctx)
         if not records:
             return False
 
diff --git a/tests/storage/test_semantic_processor_mv_vector_store.py b/tests/storage/test_semantic_processor_mv_vector_store.py
new file mode 100644
index 00000000..44e1c069
--- /dev/null
+++ b/tests/storage/test_semantic_processor_mv_vector_store.py
@@ -0,0 +1,217 @@
+from __future__ import annotations
+
+import hashlib
+from typing import Any, Dict, List, Optional
+
+import pytest
+
+from openviking.server.identity import RequestContext, Role
+from openviking.storage.expr import And, Eq, In
+from openviking_cli.session.user_id import UserIdentifier
+
+
+class _FakeVectorStore:
+    def __init__(self, records: List[Dict[str, Any]]):
+        self.records = list(records)
+        self.deleted_ids: List[str] = []
+
+    async def update_uri_mapping(
+        self,
+        *,
+        ctx: RequestContext,
+        uri: str,
+        new_uri: str,
+        new_parent_uri: str,
+        levels: Optional[List[int]] = None,
+    ) -> bool:
+        def seed_uri_for_id(target_uri: str, level: int) -> str:
+            if level == 0:
+                return (
+                    target_uri
+                    if target_uri.endswith("/.abstract.md")
+                    else f"{target_uri}/.abstract.md"
+                )
+            if level == 1:
+                return (
+                    target_uri
+                    if target_uri.endswith("/.overview.md")
+                    else f"{target_uri}/.overview.md"
+                )
+            return target_uri
+
+        touched = False
+        ids_to_delete: List[str] = []
+        for record in list(self.records):
+            if record.get("account_id") != ctx.account_id:
+                continue
+            if record.get("uri") != uri:
+                continue
+            try:
+                level = int(record.get("level", 2))
+            except (TypeError, ValueError):
+                level = 2
+            if levels is not None and level not in set(levels):
+                continue
+
+            seed_uri = seed_uri_for_id(new_uri, level)
+            new_id = hashlib.md5(f"{ctx.account_id}:{seed_uri}".encode("utf-8")).hexdigest()
+            new_record = dict(record)
+            new_record["id"] = new_id
+            new_record["uri"] = new_uri
+            new_record["parent_uri"] = new_parent_uri
+            self.records.append(new_record)
+            touched = True
+
+            old_id = record.get("id")
+            if old_id and old_id != new_id:
+                ids_to_delete.append(old_id)
+
+        if ids_to_delete:
+            await self.delete(list(set(ids_to_delete)), ctx=ctx)
+
+        return touched
+
+    async def filter(self, *, filter=None, limit: int = 100, ctx: RequestContext):
+        conds = []
+        if filter is not None:
+            if isinstance(filter, And):
+                conds = list(filter.conds)
+            else:
+                conds = [filter]
+
+        uri: Optional[str] = None
+        account_id: Optional[str] = None
+        owner_space: Optional[str] = None
+        levels: Optional[List[int]] = None
+
+        for cond in conds:
+            if isinstance(cond, Eq) and cond.field == "uri":
+                uri = cond.value
+            elif isinstance(cond, Eq) and cond.field == "account_id":
+                account_id = cond.value
+            elif isinstance(cond, Eq) and cond.field == "owner_space":
+                owner_space = cond.value
+            elif isinstance(cond, In) and cond.field == "level":
+                levels = [int(v) for v in cond.values]
+
+        matched = [
+            r
+            for r in self.records
+            if (uri is None or r.get("uri") == uri)
+            and (account_id is None or r.get("account_id") == account_id)
+            and (owner_space is None or r.get("owner_space") == owner_space)
+            and (levels is None or int(r.get("level", 2)) in levels)
+        ]
+        return matched[:limit]
+
+    async def delete(self, ids: List[str], *, ctx: RequestContext) -> int:
+        id_set = set(ids)
+        self.deleted_ids.extend(ids)
+        self.records = [r for r in self.records if r.get("id") not in id_set]
+        return len(ids)
+
+
+class _NoopLockContext:
+    def __init__(self, *_args, **_kwargs):
+        return None
+
+    async def __aenter__(self):
+        return None
+
+    async def __aexit__(self, exc_type, exc, tb):
+        return False
+
+
+@pytest.mark.asyncio
+async def test_mv_vector_store_moves_records(monkeypatch):
+    from openviking.storage.viking_fs import VikingFS
+
+    ctx = RequestContext(user=UserIdentifier("acc", "user", "agent"), role=Role.ROOT)
+    old_uri = "viking://resources/a"
+    new_uri = "viking://resources/b"
+
+    store = _FakeVectorStore(
+        [
+            {"id": "l0", "uri": old_uri, "level": 0, "account_id": ctx.account_id, "owner_space": ""},
+            {"id": "l1", "uri": old_uri, "level": 1, "account_id": ctx.account_id, "owner_space": ""},
+            {"id": "l2", "uri": old_uri, "level": 2, "account_id": ctx.account_id, "owner_space": ""},
+            {
+                "id": "child-l0",
+                "uri": f"{old_uri}/x",
+                "level": 0,
+                "account_id": ctx.account_id,
+                "owner_space": "",
+            },
+        ]
+    )
+
+    class _FakeAGFS:
+        def rm(self, _path, recursive: bool = False):
+            return None
+
+    class _FakeVikingFS(VikingFS):
+        def __init__(self):
+            super().__init__(agfs=_FakeAGFS(), vector_store=store)
+
+        def _uri_to_path(self, uri, ctx=None):
+            return f"/mock/{uri.replace('viking://', '')}"
+
+        async def stat(self, uri, ctx=None):
+            return {"isDir": True}
+
+        def _ensure_access(self, uri, ctx):
+            return None
+
+    monkeypatch.setattr(
+        "openviking.storage.viking_fs.get_viking_fs",
+        lambda: _FakeVikingFS(),
+    )
+    monkeypatch.setattr("openviking.storage.transaction.get_lock_manager", lambda: None)
+    monkeypatch.setattr("openviking.storage.transaction.LockContext", _NoopLockContext)
+
+    fs = _FakeVikingFS()
+    await fs._mv_vector_store_l0_l1(old_uri, new_uri, ctx=ctx)
+
+    assert {r["id"] for r in store.records if r.get("uri") == old_uri} == {"l2"}
+    assert {r["id"] for r in store.records if r.get("uri") == f"{old_uri}/x"} == {"child-l0"}
+    assert {int(r["level"]) for r in store.records if r.get("uri") == new_uri} == {0, 1}
+    assert set(store.deleted_ids) == {"l0", "l1"}
+
+
+@pytest.mark.asyncio
+async def test_mv_vector_store_requires_directories(monkeypatch):
+    from openviking.storage.viking_fs import VikingFS
+
+    ctx = RequestContext(user=UserIdentifier("acc", "user", "agent"), role=Role.ROOT)
+    old_uri = "viking://resources/a"
+    new_uri = "viking://resources/b"
+
+    store = _FakeVectorStore([])
+
+    class _FakeAGFS:
+        def rm(self, _path, recursive: bool = False):
+            return None
+
+    class _FakeVikingFS(VikingFS):
+        def __init__(self):
+            super().__init__(agfs=_FakeAGFS(), vector_store=store)
+
+        def _uri_to_path(self, uri, ctx=None):
+            return f"/mock/{uri.replace('viking://', '')}"
+
+        async def stat(self, uri, ctx=None):
+            return {"isDir": uri == old_uri}
+
+        def _ensure_access(self, uri, ctx):
+            return None
+
+    monkeypatch.setattr(
+        "openviking.storage.viking_fs.get_viking_fs",
+        lambda: _FakeVikingFS(),
+    )
+    monkeypatch.setattr("openviking.storage.transaction.get_lock_manager", lambda: None)
+    monkeypatch.setattr("openviking.storage.transaction.LockContext", _NoopLockContext)
+
+    fs = _FakeVikingFS()
+    with pytest.raises(ValueError):
+        await fs._mv_vector_store_l0_l1(old_uri, new_uri, ctx=ctx)