diff --git a/API.md b/API.md
index 9afa626..9ec2bfb 100644
--- a/API.md
+++ b/API.md
@@ -645,7 +645,7 @@ Base 前缀 `/api/v1/admin`。
 | `DELETE` | `/api/v1/platform/workspaces/{workspace_id}/members/{user_id}` | 软删成员 |
 | `GET` | `/api/v1/platform/roles` | 列全部 `role_scope='platform'` 的角色及其 `permission_codes`(仅系统管理员) |
 | `GET` | `/api/v1/platform/roles/{role_code}/permissions` | 单个平台角色的 `permission_codes`(仅系统管理员) |
-| `PATCH` | `/api/v1/platform/roles/{role_code}/permissions` | 整体替换角色权限集合;对 `admin` 角色保留 `system.view` + `system.manage` 的最后系统管理员保护(仅系统管理员) |
+| `PATCH` | `/api/v1/platform/roles/{role_code}/permissions` | 整体替换角色权限集合;对 `admin` 角色强制保留 `system:view` 的最后系统管理员保护(仅系统管理员) |
 
 > **不变量**:
 > - 每个 workspace 必须始终保留至少一个 `admin` 角色的活跃成员;对最后 admin 做降级 / 停用 / 删除 → 409。
@@ -883,11 +883,8 @@ Base 前缀 `/api/v1/admin`。
         "role_name": "管理员",
         "is_builtin": true,
         "permission_codes": [
-          "dashboard.view", "experiment.all", "experiment.own",
-          "resource.personal", "resource.public.manage",
-          "resource.public.upload", "schedule.all", "schedule.own",
-          "script.build", "script.public.manage", "system.manage",
-          "system.view"
+          "dashboard:view", "schedule:view", "script:view",
+          "system:project:view", "system:user:view", "system:view"
         ]
       },
       {
@@ -896,8 +893,7 @@ Base 前缀 `/api/v1/admin`。
         "role_name": "开发人员",
         "is_builtin": true,
         "permission_codes": [
-          "dashboard.view", "experiment.own", "resource.personal",
-          "schedule.own", "script.build", "script.public.manage"
+          "dashboard:view", "schedule:view", "script:view"
         ]
       }
     ],
@@ -923,11 +919,8 @@ Base 前缀 `/api/v1/admin`。
       "role_name": "管理员",
       "is_builtin": true,
       "permission_codes": [
-        "dashboard.view", "experiment.all", "experiment.own",
-        "resource.personal", "resource.public.manage",
-        "resource.public.upload", "schedule.all", "schedule.own",
-        "script.build", "script.public.manage", "system.manage",
-        "system.view"
+        "dashboard:view", "schedule:view", "script:view",
+        "system:project:view", "system:user:view", "system:view"
       ]
     },
     "meta": {}
@@ -948,8 +941,8 @@ Base 前缀 `/api/v1/admin`。
 
 - **守卫顺序(load-bearing,不可调换)**:
   1. 角色不存在 / `role_scope != 'platform'` → 404。
-  2. **`admin` 角色**:提交的 `permission_codes` 必须同时包含 `system.view` 与 `system.manage`,否则 → 409 "admin 角色必须保留 system.view 与 system.manage 权限"。
-  3. **非 `admin` 角色**:`permission_codes` 中**禁止**含 `system.*` 项 → 422 "非 admin 角色不能拥有 system.* 权限: [...]"。menu permission 只控前端展示,后端 `/api/v1/platform/*` 鉴权仍按 `role_code == "admin"`;若让 developer 拿到 `system.manage`,前端会渲染"系统管理"入口但所有 platform API 调用 403,UX 割裂。
+  2. **`admin` 角色**:提交的 `permission_codes` 必须包含 `system:view`,否则 → 409 "admin 角色必须保留 system:view 权限"。
+  3. **非 `admin` 角色**:`permission_codes` 中**禁止**含 `system:*` 项 → 422 "非 admin 角色不能拥有 system:* 权限: [...]"。menu permission 只控前端展示,后端 `/api/v1/platform/*` 鉴权仍按 `role_code == "admin"`;若让 developer 拿到 `system:view`,前端会渲染"系统管理"入口但所有 platform API 调用 403,UX 割裂。
   4. 任意 `permission_code` 不在 `permissions` 表活跃行中 → 422 "未知的 permission_code: [...]"。
   5. 写入策略:diff-based —— 只 soft-delete `current \ new` 的关联,只 INSERT `new \ current` 的关联。重复提交同 payload 是 no-op;包含原有 codes 的 patch 不会触发 `(role_id, permission_id)` 主键冲突。**严禁**先全量 soft-delete 再全量 INSERT(会 `IntegrityError`,因为软删行仍占主键 slot)。
 - 写入后,响应 `data.permission_codes` 为本次写入后的活跃集合,与再次 `GET §7.13` 完全一致。
@@ -963,32 +956,26 @@ Base 前缀 `/api/v1/admin`。
       "role_code": "admin",
       "role_name": "管理员",
       "is_builtin": true,
-      "permission_codes": ["dashboard.view", "system.manage", "system.view"]
+      "permission_codes": ["dashboard:view", "system:view"]
     },
     "meta": {}
   }
   ```
 
-- **当前 seed 的 permission_code 全集**(来自迁移 `f6a7b8c9d0e1`,与 `migrations/data/migrate_system_json.py::PERMISSION_NAMES` 真值对齐,不要在客户端另造一份):
+- **当前 seed 的 permission_code 全集**(由 baseline `e1f2a3b4c5d6_rebuild_baseline` 直接写入 MySQL,不要在客户端另造一份):
 
 | `permission_code` | `module_code` | admin | developer |
 |---|---|:-:|:-:|
-| `dashboard.view` | dashboard | ✓ | ✓ |
-| `script.build` | script | ✓ | ✓ |
-| `script.public.manage` | script | ✓ | ✓ |
-| `schedule.own` | schedule | ✓ | ✓ |
-| `schedule.all` | schedule | ✓ |  |
-| `experiment.own` | experiment | ✓ | ✓ |
-| `experiment.all` | experiment | ✓ |  |
-| `resource.personal` | resource | ✓ | ✓ |
-| `resource.public.upload` | resource | ✓ |  |
-| `resource.public.manage` | resource | ✓ |  |
-| `system.view` | system | ✓ |  |
-| `system.manage` | system | ✓ |  |
+| `dashboard:view` | dashboard | ✓ | ✓ |
+| `script:view` | script | ✓ | ✓ |
+| `schedule:view` | schedule | ✓ | ✓ |
+| `system:view` | system | ✓ |  |
+| `system:user:view` | system | ✓ |  |
+| `system:project:view` | system | ✓ |  |
 
 > **与现有 7.x 端点的语义差异**(避免 reviewer 误读):
 > - 本端点不修改 `users.platform_role_id`,只调整 `role_permissions` 关联表。
-> - "清空 developer 的全部权限"是合法操作;只有 `admin` 受 `system.*` 强制约束。
+> - "清空 developer 的全部权限"是合法操作;只有 `admin` 受 `system:*` 强制约束。
 > - `role_code` 不是 `permission_code`,前端不要用前者去判断菜单可见性。
 
 ---
diff --git a/backend/src/backend/api/platform.py b/backend/src/backend/api/platform.py
index 7b865ec..f251985 100644
--- a/backend/src/backend/api/platform.py
+++ b/backend/src/backend/api/platform.py
@@ -58,7 +58,7 @@ Invariants
 * ``DELETE /workspaces/{id}`` is allowed from any non-disabled status and
   sets ``status='disabled'`` + ``is_deleted=1`` + ``deleted_at`` on the
   workspace and every one of its active memberships.
-* The ``admin`` role must always keep ``system.view`` + ``system.manage``
+* The ``admin`` role must always keep ``system:view``.
   menu permissions; non-admin roles may never hold ``system.*``
   permissions. Menu permissions gate frontend rendering only — API
   authorization always keys off ``role_code == 'admin'``.
@@ -1185,7 +1185,7 @@ async def patch_role_permissions(
       1. Load the role. Reject 404 if it is missing or not
          platform-scoped.
       2. Admin role: the patched ``permission_codes`` MUST still include
-         both ``system.view`` and ``system.manage``. Otherwise every
+         ``system:view``. Otherwise every
          active admin loses the menu entry to this very endpoint and
          the platform locks itself out. Reject with 409. (No last-admin
          count is needed here — menu permissions never gate API access;
@@ -1207,12 +1207,12 @@ async def patch_role_permissions(
 
     if role.role_code == "admin":
         keeps_admin_entry = (
-            "system.view" in new_codes and "system.manage" in new_codes
+            "system:view" in new_codes
         )
         if not keeps_admin_entry:
             raise HTTPException(
                 status.HTTP_409_CONFLICT,
-                "admin 角色必须保留 system.view 与 system.manage 权限",
+                "admin 角色必须保留 system:view 权限",
             )
     else:
         # Menu permissions are a frontend-display signal only — backend
@@ -1222,7 +1222,7 @@ async def patch_role_permissions(
         # /api/v1/platform/* call still returns 403. Reject with 422 so
         # the failure is unambiguous about *what* the input violated.
         leaked_system = [
-            code for code in new_codes if code.startswith("system.")
+            code for code in new_codes if code.startswith("system:")
         ]
         if leaked_system:
             raise HTTPException(
diff --git a/frontend/app/context/AuthContext.tsx b/frontend/app/context/AuthContext.tsx
index e4f95e9..f440891 100644
--- a/frontend/app/context/AuthContext.tsx
+++ b/frontend/app/context/AuthContext.tsx
@@ -20,6 +20,7 @@ export type AuthUser = {
   status: string;
   role_code: string | null;
   is_system_admin: boolean;
+  permissions: string[];
 };
 
 export type AuthWorkspace = {
@@ -312,3 +313,8 @@ export function useApi(): WorkspaceBoundApi {
     deleteWorkspaceMember: (workspaceId, userId) => rawApi.deleteWorkspaceMember(workspaceId, userId),
   }), [workspaceId]);
 }
+
+export function usePermission(code: string): boolean {
+  const { user } = useAuth();
+  return user?.permissions.includes(code) ?? false;
+}
diff --git a/frontend/app/features/admin/DashboardPage.tsx b/frontend/app/features/admin/DashboardPage.tsx
index f9c4794..7ef7afe 100644
--- a/frontend/app/features/admin/DashboardPage.tsx
+++ b/frontend/app/features/admin/DashboardPage.tsx
@@ -1,5 +1,5 @@
 import Icon from "../../components/common/Icon";
-import { useAuth } from "../../context/AuthContext";
+import { useAuth, usePermission } from "../../context/AuthContext";
 
 const TREND_VALUES = [38, 55, 44, 73, 61, 86, 78] as const;
 const TREND_LABELS = ["周一", "周二", "周三", "周四", "周五", "周六", "今天"] as const;
@@ -25,7 +25,7 @@ export function DashboardPage({
   onNavigate: (page: "scripts" | "schedules" | "system") => void;
 }) {
   const { user, currentWorkspace } = useAuth();
-  const isSystemAdmin = user?.is_system_admin ?? false;
+  const hasSystemView = usePermission("system:view");
   const notebookCount = Math.max(1, Math.round(scriptCount * 0.67));
   const pythonCount = Math.max(0, scriptCount - Math.round(scriptCount * 0.67));
 
@@ -92,7 +92,7 @@ export function DashboardPage({
           <Icon name="schedule" />
           调度配置
         </button>
-        {isSystemAdmin && (
+        {hasSystemView && (
           <button
             type="button"
             className="flex cursor-pointer items-center gap-2 rounded-[7px] border border-[#d8e4ef] bg-white px-[18px] py-[13px] text-[#346587]"
diff --git a/frontend/app/routes/platform.navigation.tsx b/frontend/app/routes/platform.navigation.tsx
new file mode 100644
index 0000000..9fd9fa2
--- /dev/null
+++ b/frontend/app/routes/platform.navigation.tsx
@@ -0,0 +1,38 @@
+import { Home, Code, Calendar, Settings, Users, Folder } from "lucide-react";
+import type { ComponentType } from "react";
+
+export type ActivePage = "home" | "scripts" | "schedules" | "system";
+export type SubPage = "users" | "projects";
+
+export type NavigationItem = {
+  /** 菜单显示名 */
+  label: string;
+  /** 渲染在菜单前的图标组件（lucide-react 或等价） */
+  icon: ComponentType;
+  /** 入口页 — 点击后由 guardedNavigate 处理 */
+  page: ActivePage;
+  /** 子页段，仅 children 项使用 */
+  sub?: SubPage;
+  /** 命中高亮的 pathname；不填则按 pathForPage(page) 派生 */
+  activePath?: string;
+  /** 当前端可访问的权限码；未配置时视为所有人可访问 */
+  permission?: string;
+  /** 子菜单条目 */
+  children?: NavigationItem[];
+};
+
+export const navigation: NavigationItem[] = [
+  { label: "工作台",   icon: Home,     page: "home",      permission: "dashboard:view" },
+  { label: "构建脚本", icon: Code,     page: "scripts",   permission: "script:view" },
+  { label: "调度配置", icon: Calendar, page: "schedules", permission: "schedule:view" },
+  {
+    label: "系统管理",
+    icon: Settings,
+    page: "system",
+    permission: "system:view",
+    children: [
+      { label: "用户管理", icon: Users,  page: "system", sub: "users",    permission: "system:user:view" },
+      { label: "项目管理", icon: Folder, page: "system", sub: "projects", permission: "system:project:view" },
+    ],
+  },
+];
diff --git a/frontend/app/routes/platform.tsx b/frontend/app/routes/platform.tsx
index 4220198..c6b5b1d 100644
--- a/frontend/app/routes/platform.tsx
+++ b/frontend/app/routes/platform.tsx
@@ -1,7 +1,9 @@
 import { useEffect, useState } from "react";
 import { Outlet, useLocation, useNavigate } from "react-router";
 
-import { Home, Code, Calendar, Settings, Users, Folder, PanelLeft, ChevronRight } from "lucide-react";
+import { PanelLeft, ChevronRight } from "lucide-react";
+import { navigation } from "./platform.navigation";
+import type { ActivePage, NavigationItem } from "./platform.navigation";
 import { Collapsible } from "@base-ui/react/collapsible";
 
 import type { Route } from "./+types/platform";
@@ -23,7 +25,7 @@ import {
   SidebarTrigger,
   SidebarInset,
 } from "~/components/ui/sidebar";
-import { useApi, useAuth } from "~/context/AuthContext";
+import { useApi, useAuth, usePermission } from "~/context/AuthContext";
 import { useEditSessionLifecycle } from "~/features/platform/hooks/useEditSessionLifecycle";
 import {
   bindScriptWorkspaceApi,
@@ -36,8 +38,6 @@ import { useUiStore } from "~/features/platform/state/uiStore";
 import { bindAdminApi } from "~/features/admin/state/adminStore";
 import { bindSchedulesApi } from "~/features/schedules/state/helpers";
 
-type ActivePage = "home" | "scripts" | "schedules" | "system";
-
 function pageFromPath(pathname: string): ActivePage {
   const first = pathname.replace(/^\/+/, "").split("/")[0];
   if (first === "workbench" || first === "") return "home";
@@ -59,6 +59,80 @@ export function meta({}: Route.MetaArgs) {
   ];
 }
 
+function NavRow({
+  item,
+  can,
+  activePage,
+  pathname,
+  onNavigate,
+}: {
+  item: NavigationItem;
+  can: (code: string) => boolean;
+  activePage: ActivePage;
+  pathname: string;
+  onNavigate: (sub?: "users" | "projects") => void;
+}) {
+  const itemIcon = <item.icon />;
+  const childActivePath = (child: NavigationItem) =>
+    child.activePath ?? pathForPage(child.page);
+
+  if (item.children && item.children.length > 0) {
+    return (
+      <Collapsible.Root
+        defaultOpen={activePage === item.page}
+        className="group/collapsible"
+      >
+        <SidebarMenuItem>
+          <Collapsible.Trigger
+            render={
+              <SidebarMenuButton
+                className="py-3 text-sm"
+                isActive={activePage === item.page}
+                data-active={activePage === item.page ? "true" : undefined}
+              />
+            }
+          >
+            {itemIcon}
+            <span>{item.label}</span>
+            <ChevronRight className="ml-auto size-4 transition-transform group-data-[open]/collapsible:rotate-90" />
+          </Collapsible.Trigger>
+          <Collapsible.Panel>
+            <SidebarMenuSub className="gap-1.5 mt-2">
+              {item.children
+                .filter((child) => !child.permission || can(child.permission))
+                .map((child) => (
+                  <SidebarMenuSubItem key={child.label}>
+                    <SidebarMenuSubButton
+                      className="h-9 text-xs"
+                      onClick={() => onNavigate(child.sub)}
+                      isActive={pathname === childActivePath(child)}
+                    >
+                      <child.icon /> <span>{child.label}</span>
+                    </SidebarMenuSubButton>
+                  </SidebarMenuSubItem>
+                ))}
+            </SidebarMenuSub>
+          </Collapsible.Panel>
+        </SidebarMenuItem>
+      </Collapsible.Root>
+    );
+  }
+
+  return (
+    <SidebarMenuItem>
+      <SidebarMenuButton
+        className="py-3 text-sm"
+        onClick={() => onNavigate()}
+        isActive={activePage === item.page}
+        data-active={activePage === item.page ? "true" : undefined}
+      >
+        {itemIcon}
+        <span>{item.label}</span>
+      </SidebarMenuButton>
+    </SidebarMenuItem>
+  );
+}
+
 export default function PlatformLayout() {
   const { currentWorkspace } = useAuth();
   if (!currentWorkspace) {
@@ -98,7 +172,7 @@ function AuthenticatedLayout() {
 
   const [sidebarCollapsed, setSidebarCollapsed] = useState(false);
 
-  const isSystemAdmin = user?.is_system_admin ?? false;
+  const can = usePermission;
 
   // 绑定 api 到 script workspace store。
   // 必须放在 render body(同步),不能用 useEffect([api]) + cleanup —
@@ -168,80 +242,18 @@ function AuthenticatedLayout() {
         </SidebarHeader>
         <SidebarContent>
           <SidebarMenu className="gap-1.5">
-            <SidebarMenuItem>
-              <SidebarMenuButton
-                className="py-3 text-sm"
-                onClick={() => guardedNavigate("home")}
-                isActive={activePage === "home"}
-                data-active={activePage === "home" ? "true" : undefined}
-              >
-                <Home /> <span>工作台</span>
-              </SidebarMenuButton>
-            </SidebarMenuItem>
-            <SidebarMenuItem>
-              <SidebarMenuButton
-                className="py-3 text-sm"
-                onClick={() => guardedNavigate("scripts")}
-                isActive={activePage === "scripts"}
-                data-active={activePage === "scripts" ? "true" : undefined}
-              >
-                <Code /> <span>构建脚本</span>
-              </SidebarMenuButton>
-            </SidebarMenuItem>
-            <SidebarMenuItem>
-              <SidebarMenuButton
-                className="py-3 text-sm"
-                onClick={() => guardedNavigate("schedules")}
-                isActive={activePage === "schedules"}
-                data-active={activePage === "schedules" ? "true" : undefined}
-              >
-                <Calendar /> <span>调度配置</span>
-              </SidebarMenuButton>
-            </SidebarMenuItem>
-            {isSystemAdmin && (
-              <Collapsible.Root
-                defaultOpen={activePage === "system"}
-                className="group/collapsible"
-              >
-                <SidebarMenuItem>
-                  <Collapsible.Trigger
-                    render={
-                      <SidebarMenuButton
-                        className="py-3 text-sm"
-                        isActive={activePage === "system"}
-                        data-active={activePage === "system" ? "true" : undefined}
-                      />
-                    }
-                  >
-                    <Settings />
-                    <span>系统管理</span>
-                    <ChevronRight className="ml-auto size-4 transition-transform group-data-[open]/collapsible:rotate-90" />
-                  </Collapsible.Trigger>
-                  <Collapsible.Panel>
-                    <SidebarMenuSub className="gap-1.5 mt-2">
-                      <SidebarMenuSubItem>
-                        <SidebarMenuSubButton
-                          className="h-9 text-xs"
-                          onClick={() => guardedNavigate("system", "users")}
-                          isActive={location.pathname === "/system/users"}
-                        >
-                          <Users /> <span>用户管理</span>
-                        </SidebarMenuSubButton>
-                      </SidebarMenuSubItem>
-                      <SidebarMenuSubItem>
-                        <SidebarMenuSubButton
-                          className="h-9 text-xs"
-                          onClick={() => guardedNavigate("system", "projects")}
-                          isActive={location.pathname === "/system/projects"}
-                        >
-                          <Folder /> <span>项目管理</span>
-                        </SidebarMenuSubButton>
-                      </SidebarMenuSubItem>
-                    </SidebarMenuSub>
-                  </Collapsible.Panel>
-                </SidebarMenuItem>
-              </Collapsible.Root>
-            )}
+            {navigation
+              .filter((item) => !item.permission || can(item.permission))
+              .map((item) => (
+                <NavRow
+                  key={item.page}
+                  item={item}
+                  can={can}
+                  activePage={activePage}
+                  pathname={location.pathname}
+                  onNavigate={(sub) => guardedNavigate(item.page, sub)}
+                />
+              ))}
           </SidebarMenu>
         </SidebarContent>
         <SidebarFooter>
diff --git a/migrations/data/README.md b/migrations/data/README.md
deleted file mode 100644
index 352e00b..0000000
--- a/migrations/data/README.md
+++ /dev/null
@@ -1,70 +0,0 @@
-# Data Migrations
-
-该目录保存从旧版 JSON 状态文件迁移到 MySQL 的一次性工具。
-
-数据迁移工具必须满足：
-
-- 默认只预检，必须显式传入 `--apply` 才能写数据库；
-- 单个事务提交，失败时完整回滚；
-- 可以安全重复执行，不产生重复数据；
-- 输出源文件摘要、源数据数量和实际变更数量；
-- 不修改或删除旧版 JSON 源文件。
-
-## system.json
-
-```powershell
-$env:DATABASE_URL = "mysql+asyncmy://<user>:<password>@<host>:3306/<database>?charset=utf8mb4"
-python -m migrations.data.migrate_system_json --source "<path>/system.json"
-python -m migrations.data.migrate_system_json --source "<path>/system.json" --apply
-```
-
-新迁移用户使用不可登录的占位密码哈希。后续接入认证时，必须通过密码初始化、
-管理员重置或外部身份认证启用登录，不能把旧版无密码账号视为已有凭据。
-
-## WORKSPACE_DEFINITIONS
-
-旧版 Workspace 定义位于 `文件1/server.py` 的
-`WORKSPACE_DEFINITIONS` 常量中。迁移工具通过 Python AST 仅读取这一静态常量，
-不执行旧服务代码：
-
-```powershell
-python -m migrations.data.migrate_legacy_workspaces --source "<path>/server.py"
-python -m migrations.data.migrate_legacy_workspaces --source "<path>/server.py" --apply
-```
-
-- 创建者取每个 Workspace 成员中的第一个管理员；
-- 成员角色沿用第 9 步迁入的平台注册角色；
-- 活跃目录统一为 `file:///workspace/workspaces/{workspace_code}`；
-- 制品前缀统一为 `workspaces/{workspace_id}`；
-- 旧审计记录仅在用户唯一属于一个 Workspace 时补齐归属。
-
-## 第 9 小步执行记录
-
-- 执行日期：2026-07-24
-- 源文件：`文件1/platform_data/system.json`
-- SHA-256：`ef4ee0e92f4a3679c17f23aff6066688fa9231db4477208e36fcbd343cd446a7`
-- 迁移结果：2 个角色、13 个权限、21 条角色权限、4 个用户、26 条审计记录
-- 角色权限：`admin=13`，`developer=8`
-- 中文字段：UTF-8 校验通过，问号乱码记录为 0
-- 幂等验证：第二次执行插入和更新均为 0，跳过已有审计记录 26 条
-- 旧版源文件：未修改、未删除
-
-## 第 10 小步执行记录
-
-- 执行日期：2026-07-24
-- 源文件及常量：`文件1/server.py` / `WORKSPACE_DEFINITIONS`
-- SHA-256：`d7ec05f1ab7b2cdeb78f6293de40fbe23fa74b6a7fe4ccb03a9cc64e4cc1f464`
-- 迁移结果：2 个 Workspace、4 条成员关系
-- 成员分布：`model-dev` 2 人，`risk-validation` 2 人
-- 审计归属：补齐 26 条，其中 `model-dev` 24 条、`risk-validation` 2 条
-- 中文字段：UTF-8 校验通过，异常记录为 0
-- 幂等验证：第二次执行及镜像内 dry-run 的变更数均为 0
-- 镜像验证：仅挂载旧版 `server.py` 时，迁移工具可独立读取并完成校验
-- 旧版源文件：未修改、未删除
-
-## 第 11、12 小步数据处理决定
-
-根据实施确认，第 11、12 小步不迁移旧版资源、脚本或稳定版本数据。新实现直接
-使用 MySQL、Workspace 文件目录和对象存储（s3 模式连 S3-兼容服务，local 模式
-走 `/data/storage` 共享卷），从空的 `data_resources`、`scripts` 及
-`versions` 表开始运行。功能验收产生的临时对象和数据库记录均已清理。
diff --git a/migrations/data/migrate_legacy_workspaces.py b/migrations/data/migrate_legacy_workspaces.py
deleted file mode 100644
index 3bd59ff..0000000
--- a/migrations/data/migrate_legacy_workspaces.py
+++ /dev/null
@@ -1,365 +0,0 @@
-from __future__ import annotations
-
-import argparse
-import ast
-import asyncio
-import hashlib
-import json
-import os
-from pathlib import Path
-from typing import Any
-from urllib.parse import quote
-
-from common.db import create_database_engine, create_session_factory
-from common.db.models import (
-    Roles,
-    Users,
-    WorkspaceMembers,
-    Workspaces,
-)
-from pydantic import BaseModel, ConfigDict, TypeAdapter
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession
-
-from migrations.data.migrate_system_json import (
-    deterministic_legacy_ulid,
-    set_changed,
-)
-
-
-class LegacyWorkspace(BaseModel):
-    model_config = ConfigDict(extra="forbid")
-
-    id: str
-    name: str
-    description: str | None = None
-    userIds: list[str]
-    portOffset: int
-
-
-WORKSPACE_LIST = TypeAdapter(list[LegacyWorkspace])
-
-
-def require_unique(values: list[str], label: str) -> None:
-    duplicates = sorted(
-        value for value in set(values) if values.count(value) > 1
-    )
-    if duplicates:
-        raise ValueError(f"duplicate {label}: {duplicates}")
-
-
-def extract_workspace_definitions(
-    source_path: Path,
-) -> tuple[list[LegacyWorkspace], str]:
-    raw = source_path.read_bytes()
-    module = ast.parse(
-        raw.decode("utf-8-sig"),
-        filename=str(source_path),
-    )
-    definition: Any | None = None
-
-    for statement in module.body:
-        if not isinstance(statement, ast.Assign):
-            continue
-        if any(
-            isinstance(target, ast.Name)
-            and target.id == "WORKSPACE_DEFINITIONS"
-            for target in statement.targets
-        ):
-            definition = ast.literal_eval(statement.value)
-            break
-
-    if definition is None:
-        raise ValueError("WORKSPACE_DEFINITIONS was not found")
-
-    workspaces = WORKSPACE_LIST.validate_python(definition)
-    require_unique([item.id for item in workspaces], "workspace ids")
-    for workspace in workspaces:
-        require_unique(
-            workspace.userIds,
-            f"members of workspace {workspace.id}",
-        )
-        if not workspace.userIds:
-            raise ValueError(
-                f"workspace {workspace.id!r} has no members"
-            )
-
-    return workspaces, hashlib.sha256(raw).hexdigest()
-
-
-def new_stats() -> dict[str, int]:
-    return {
-        "workspaces_inserted": 0,
-        "workspaces_updated": 0,
-        "workspace_members_inserted": 0,
-        "workspace_members_updated": 0,
-    }
-
-
-async def load_users_and_roles(
-    session: AsyncSession,
-) -> tuple[dict[str, Users], dict[str, str]]:
-    users = {
-        item.username: item
-        for item in (
-            await session.scalars(select(Users).order_by(Users.username))
-        ).all()
-    }
-    roles_by_id = {
-        item.role_id: item.role_code
-        for item in (
-            await session.scalars(select(Roles).order_by(Roles.role_code))
-        ).all()
-    }
-    role_codes_by_username = {
-        username: roles_by_id[user.platform_role_id]
-        for username, user in users.items()
-        if user.platform_role_id in roles_by_id
-    }
-    return users, role_codes_by_username
-
-
-def validate_members(
-    workspaces: list[LegacyWorkspace],
-    users: dict[str, Users],
-    role_codes_by_username: dict[str, str],
-) -> None:
-    source_members = {
-        username
-        for workspace in workspaces
-        for username in workspace.userIds
-    }
-    missing_users = sorted(source_members - set(users))
-    if missing_users:
-        raise ValueError(
-            f"workspace members were not migrated as users: {missing_users}"
-        )
-    users_without_roles = sorted(
-        source_members - set(role_codes_by_username)
-    )
-    if users_without_roles:
-        raise ValueError(
-            "workspace members have no platform role: "
-            f"{users_without_roles}"
-        )
-
-
-def workspace_creator(
-    workspace: LegacyWorkspace,
-    users: dict[str, Users],
-    role_codes_by_username: dict[str, str],
-) -> Users:
-    admin_username = next(
-        (
-            username
-            for username in workspace.userIds
-            if role_codes_by_username[username] == "admin"
-        ),
-        workspace.userIds[0],
-    )
-    return users[admin_username]
-
-
-async def migrate_workspaces(
-    session: AsyncSession,
-    source: list[LegacyWorkspace],
-    users: dict[str, Users],
-    role_codes_by_username: dict[str, str],
-    stats: dict[str, int],
-) -> dict[str, str]:
-    existing = {
-        item.workspace_code: item
-        for item in (
-            await session.scalars(
-                select(Workspaces).order_by(Workspaces.workspace_code)
-            )
-        ).all()
-    }
-    workspace_ids: dict[str, str] = {}
-
-    for legacy in source:
-        workspace = existing.get(legacy.id)
-        if workspace is None:
-            workspace_id = deterministic_legacy_ulid(
-                "workspace", legacy.id
-            )
-            creator = workspace_creator(
-                legacy,
-                users,
-                role_codes_by_username,
-            )
-            workspace = Workspaces(
-                workspace_id=workspace_id,
-                workspace_code=legacy.id,
-                workspace_name=legacy.name,
-                description=legacy.description,
-                active_root_uri=(
-                    "file:///workspace/workspaces/"
-                    f"{quote(legacy.id, safe='')}"
-                ),
-                quota_bytes=0,
-                used_bytes=0,
-                status="active",
-                created_by=creator.user_id,
-                artifact_bucket="model-platform",
-                artifact_prefix=f"workspaces/{workspace_id}",
-            )
-            session.add(workspace)
-            stats["workspaces_inserted"] += 1
-        else:
-            values = {
-                "workspace_name": legacy.name,
-                "description": legacy.description,
-                "active_root_uri": (
-                    "file:///workspace/workspaces/"
-                    f"{quote(legacy.id, safe='')}"
-                ),
-                "artifact_bucket": "model-platform",
-                "artifact_prefix": (
-                    f"workspaces/{workspace.workspace_id}"
-                ),
-            }
-            if set_changed(workspace, values):
-                stats["workspaces_updated"] += 1
-        workspace_ids[legacy.id] = workspace.workspace_id
-
-    return workspace_ids
-
-
-async def migrate_members(
-    session: AsyncSession,
-    source: list[LegacyWorkspace],
-    workspace_ids: dict[str, str],
-    users: dict[str, Users],
-    stats: dict[str, int],
-) -> None:
-    existing = {
-        (item.workspace_id, item.user_id): item
-        for item in (
-            await session.scalars(select(WorkspaceMembers))
-        ).all()
-    }
-
-    for legacy in source:
-        workspace_id = workspace_ids[legacy.id]
-        for username in legacy.userIds:
-            user = users[username]
-            pair = (workspace_id, user.user_id)
-            member = existing.get(pair)
-            values = {
-                "role_id": user.platform_role_id,
-                "member_status": "active",
-            }
-            if member is None:
-                member = WorkspaceMembers(
-                    workspace_id=workspace_id,
-                    user_id=user.user_id,
-                    **values,
-                )
-                session.add(member)
-                existing[pair] = member
-                stats["workspace_members_inserted"] += 1
-            elif set_changed(member, values):
-                stats["workspace_members_updated"] += 1
-
-
-async def run_migration(
-    database_url: str,
-    source: list[LegacyWorkspace],
-    *,
-    apply_changes: bool,
-) -> dict[str, int]:
-    engine = create_database_engine(database_url)
-    factory = create_session_factory(engine)
-    stats = new_stats()
-
-    try:
-        async with factory() as session:
-            try:
-                users, role_codes_by_username = (
-                    await load_users_and_roles(session)
-                )
-                validate_members(
-                    source,
-                    users,
-                    role_codes_by_username,
-                )
-                workspace_ids = await migrate_workspaces(
-                    session,
-                    source,
-                    users,
-                    role_codes_by_username,
-                    stats,
-                )
-                await migrate_members(
-                    session,
-                    source,
-                    workspace_ids,
-                    users,
-                    stats,
-                )
-
-                if apply_changes:
-                    await session.commit()
-                else:
-                    await session.rollback()
-            except Exception:
-                await session.rollback()
-                raise
-    finally:
-        await engine.dispose()
-
-    return stats
-
-
-def parse_args() -> argparse.Namespace:
-    parser = argparse.ArgumentParser(
-        description=(
-            "Migrate legacy WORKSPACE_DEFINITIONS into MySQL."
-        )
-    )
-    parser.add_argument(
-        "--source",
-        required=True,
-        type=Path,
-        help="Path to the legacy server.py file.",
-    )
-    parser.add_argument(
-        "--apply",
-        action="store_true",
-        help="Commit changes. Without this flag the transaction is rolled back.",
-    )
-    return parser.parse_args()
-
-
-async def async_main() -> None:
-    args = parse_args()
-    source_path = args.source.resolve(strict=True)
-    workspaces, source_sha256 = extract_workspace_definitions(source_path)
-    stats = await run_migration(
-        os.environ["DATABASE_URL"],
-        workspaces,
-        apply_changes=args.apply,
-    )
-    result = {
-        "mode": "apply" if args.apply else "dry-run",
-        "source": str(source_path),
-        "source_symbol": "WORKSPACE_DEFINITIONS",
-        "source_sha256": source_sha256,
-        "source_counts": {
-            "workspaces": len(workspaces),
-            "workspace_members": sum(
-                len(workspace.userIds) for workspace in workspaces
-            ),
-        },
-        "changes": stats,
-    }
-    print(json.dumps(result, ensure_ascii=False, indent=2))
-
-
-def main() -> None:
-    asyncio.run(async_main())
-
-
-if __name__ == "__main__":
-    main()
diff --git a/migrations/data/migrate_system_json.py b/migrations/data/migrate_system_json.py
deleted file mode 100644
index 1c606ae..0000000
--- a/migrations/data/migrate_system_json.py
+++ /dev/null
@@ -1,406 +0,0 @@
-from __future__ import annotations
-
-import argparse
-import asyncio
-import hashlib
-import json
-import os
-from pathlib import Path
-from typing import Any
-from urllib.parse import quote
-
-from common.db import create_database_engine, create_session_factory
-from common.db.models import (
-    Permissions,
-    RolePermissions,
-    Roles,
-    Users,
-)
-from pydantic import BaseModel, ConfigDict
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession
-
-CROCKFORD_BASE32 = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
-LEGACY_PASSWORD_HASH = "!legacy-account-without-password!"
-
-PERMISSION_NAMES = {
-    "dashboard.view": "查看工作台",
-    "script.build": "构建脚本",
-    "script.public.manage": "管理公共脚本",
-    "schedule.own": "管理本人调度",
-    "schedule.all": "管理全部调度",
-    "experiment.own": "管理本人实验",
-    "experiment.all": "管理全部实验",
-    "resource.personal": "管理个人资源",
-    "resource.public.upload": "上传公共资源",
-    "resource.public.manage": "管理公共资源",
-    "system.view": "查看系统管理",
-    "system.manage": "管理系统配置",
-}
-
-
-class LegacyUser(BaseModel):
-    model_config = ConfigDict(extra="forbid")
-
-    id: str
-    name: str
-    role: str
-    roleKey: str
-    avatar: str | None = None
-
-
-class LegacyRole(BaseModel):
-    model_config = ConfigDict(extra="forbid")
-
-    key: str
-    name: str
-    description: str | None = None
-    permissions: list[str]
-
-
-class LegacySystem(BaseModel):
-    """Legacy platform_data/system.json shape.
-
-    ``extra='ignore'`` so legacy files that include other top-level
-    keys (e.g. historical audit-log payloads) can still be parsed —
-    only the fields this script actually consumes are listed below.
-    """
-
-    model_config = ConfigDict(extra="ignore")
-
-    users: list[LegacyUser]
-    roles: list[LegacyRole]
-
-
-def deterministic_legacy_ulid(entity_type: str, legacy_key: str) -> str:
-    """Create a stable ULID-compatible ID with an epoch timestamp prefix."""
-    digest = hashlib.sha256(
-        f"model-platform-v1:{entity_type}:{legacy_key}".encode()
-    ).digest()
-    value = int.from_bytes(b"\x00" * 6 + digest[:10], byteorder="big")
-    encoded = ["0"] * 26
-    for index in range(25, -1, -1):
-        encoded[index] = CROCKFORD_BASE32[value & 31]
-        value >>= 5
-    return "".join(encoded)
-
-
-def require_unique(values: list[str], label: str) -> None:
-    duplicates = sorted(
-        value for value in set(values) if values.count(value) > 1
-    )
-    if duplicates:
-        raise ValueError(f"duplicate {label}: {duplicates}")
-
-
-def validate_source(source: LegacySystem) -> None:
-    role_codes = [role.key for role in source.roles]
-    user_codes = [user.id for user in source.users]
-    require_unique(role_codes, "role keys")
-    require_unique(user_codes, "user ids")
-
-    role_code_set = set(role_codes)
-    unknown_roles = sorted(
-        user.roleKey
-        for user in source.users
-        if user.roleKey not in role_code_set
-    )
-    if unknown_roles:
-        raise ValueError(f"users reference unknown roles: {unknown_roles}")
-
-    for role in source.roles:
-        require_unique(role.permissions, f"permissions of role {role.key}")
-        for permission_code in role.permissions:
-            if "." not in permission_code:
-                raise ValueError(
-                    f"invalid permission code {permission_code!r}"
-                )
-
-
-def load_source(path: Path) -> tuple[LegacySystem, str]:
-    raw = path.read_bytes()
-    source = LegacySystem.model_validate_json(raw)
-    validate_source(source)
-    return source, hashlib.sha256(raw).hexdigest()
-
-
-def set_changed(instance: Any, values: dict[str, Any]) -> bool:
-    changed = False
-    for attribute, value in values.items():
-        if getattr(instance, attribute) != value:
-            setattr(instance, attribute, value)
-            changed = True
-    return changed
-
-
-def new_stats() -> dict[str, int]:
-    return {
-        "roles_inserted": 0,
-        "roles_updated": 0,
-        "permissions_inserted": 0,
-        "permissions_updated": 0,
-        "role_permissions_inserted": 0,
-        "users_inserted": 0,
-        "users_updated": 0,
-    }
-
-
-async def migrate_roles(
-    session: AsyncSession,
-    source: LegacySystem,
-    stats: dict[str, int],
-) -> dict[str, str]:
-    existing = {
-        item.role_code: item
-        for item in (
-            await session.scalars(select(Roles).order_by(Roles.role_code))
-        ).all()
-    }
-    role_ids: dict[str, str] = {}
-
-    for legacy in source.roles:
-        values = {
-            "role_name": legacy.name,
-            "role_scope": "platform",
-            "is_builtin": 1,
-            "description": legacy.description,
-        }
-        role = existing.get(legacy.key)
-        if role is None:
-            role = Roles(
-                role_id=deterministic_legacy_ulid("role", legacy.key),
-                role_code=legacy.key,
-                **values,
-            )
-            session.add(role)
-            stats["roles_inserted"] += 1
-        elif set_changed(role, values):
-            stats["roles_updated"] += 1
-        role_ids[legacy.key] = role.role_id
-
-    return role_ids
-
-
-async def migrate_permissions(
-    session: AsyncSession,
-    source: LegacySystem,
-    stats: dict[str, int],
-) -> dict[str, str]:
-    permission_codes = sorted(
-        {
-            permission_code
-            for role in source.roles
-            for permission_code in role.permissions
-        }
-    )
-    existing = {
-        item.permission_code: item
-        for item in (
-            await session.scalars(
-                select(Permissions).order_by(Permissions.permission_code)
-            )
-        ).all()
-    }
-    permission_ids: dict[str, str] = {}
-
-    for permission_code in permission_codes:
-        values = {
-            "permission_name": PERMISSION_NAMES.get(
-                permission_code, permission_code
-            ),
-            "module_code": permission_code.split(".", 1)[0],
-            "description": f"由旧版 system.json 迁移：{permission_code}",
-        }
-        permission = existing.get(permission_code)
-        if permission is None:
-            permission = Permissions(
-                permission_id=deterministic_legacy_ulid(
-                    "permission", permission_code
-                ),
-                permission_code=permission_code,
-                **values,
-            )
-            session.add(permission)
-            stats["permissions_inserted"] += 1
-        elif set_changed(permission, values):
-            stats["permissions_updated"] += 1
-        permission_ids[permission_code] = permission.permission_id
-
-    return permission_ids
-
-
-async def migrate_role_permissions(
-    session: AsyncSession,
-    source: LegacySystem,
-    role_ids: dict[str, str],
-    permission_ids: dict[str, str],
-    stats: dict[str, int],
-) -> None:
-    existing = set(
-        (
-            await session.execute(
-                select(
-                    RolePermissions.role_id,
-                    RolePermissions.permission_id,
-                )
-            )
-        ).all()
-    )
-
-    for role in source.roles:
-        for permission_code in role.permissions:
-            pair = (
-                role_ids[role.key],
-                permission_ids[permission_code],
-            )
-            if pair not in existing:
-                session.add(
-                    RolePermissions(
-                        role_id=pair[0],
-                        permission_id=pair[1],
-                    )
-                )
-                existing.add(pair)
-                stats["role_permissions_inserted"] += 1
-
-
-async def migrate_users(
-    session: AsyncSession,
-    source: LegacySystem,
-    role_ids: dict[str, str],
-    stats: dict[str, int],
-) -> dict[str, str]:
-    existing = {
-        item.username: item
-        for item in (
-            await session.scalars(select(Users).order_by(Users.username))
-        ).all()
-    }
-    user_ids: dict[str, str] = {}
-
-    for legacy in source.users:
-        values = {
-            "display_name": legacy.name,
-            "platform_role_id": role_ids[legacy.roleKey],
-            "avatar_uri": (
-                f"initial://{quote(legacy.avatar)}"
-                if legacy.avatar
-                else None
-            ),
-        }
-        user = existing.get(legacy.id)
-        if user is None:
-            user = Users(
-                user_id=deterministic_legacy_ulid("user", legacy.id),
-                username=legacy.id,
-                password_hash=LEGACY_PASSWORD_HASH,
-                status="active",
-                **values,
-            )
-            session.add(user)
-            stats["users_inserted"] += 1
-        elif set_changed(user, values):
-            stats["users_updated"] += 1
-        user_ids[legacy.id] = user.user_id
-
-    return user_ids
-
-
-async def run_migration(
-    database_url: str,
-    source: LegacySystem,
-    *,
-    apply_changes: bool,
-) -> dict[str, int]:
-    engine = create_database_engine(database_url)
-    factory = create_session_factory(engine)
-    stats = new_stats()
-
-    try:
-        async with factory() as session:
-            try:
-                role_ids = await migrate_roles(session, source, stats)
-                permission_ids = await migrate_permissions(
-                    session, source, stats
-                )
-                await migrate_role_permissions(
-                    session,
-                    source,
-                    role_ids,
-                    permission_ids,
-                    stats,
-                )
-                await migrate_users(
-                    session, source, role_ids, stats
-                )
-
-                if apply_changes:
-                    await session.commit()
-                else:
-                    await session.rollback()
-            except Exception:
-                await session.rollback()
-                raise
-    finally:
-        await engine.dispose()
-
-    return stats
-
-
-def parse_args() -> argparse.Namespace:
-    parser = argparse.ArgumentParser(
-        description="Migrate legacy system.json records into MySQL."
-    )
-    parser.add_argument(
-        "--source",
-        required=True,
-        type=Path,
-        help="Path to the legacy platform_data/system.json file.",
-    )
-    parser.add_argument(
-        "--apply",
-        action="store_true",
-        help="Commit changes. Without this flag the transaction is rolled back.",
-    )
-    return parser.parse_args()
-
-
-async def async_main() -> None:
-    args = parse_args()
-    source_path = args.source.resolve(strict=True)
-    source, source_sha256 = load_source(source_path)
-    database_url = os.environ["DATABASE_URL"]
-    stats = await run_migration(
-        database_url,
-        source,
-        apply_changes=args.apply,
-    )
-    result = {
-        "mode": "apply" if args.apply else "dry-run",
-        "source": str(source_path),
-        "source_sha256": source_sha256,
-        "source_counts": {
-            "roles": len(source.roles),
-            "permissions": len(
-                {
-                    permission
-                    for role in source.roles
-                    for permission in role.permissions
-                }
-            ),
-            "role_permissions": sum(
-                len(role.permissions) for role in source.roles
-            ),
-            "users": len(source.users),
-        },
-        "changes": stats,
-    }
-    print(json.dumps(result, ensure_ascii=False, indent=2))
-
-
-def main() -> None:
-    asyncio.run(async_main())
-
-
-if __name__ == "__main__":
-    main()
\ No newline at end of file
diff --git a/migrations/versions/e1f2a3b4c5d6_rebuild_baseline.py b/migrations/versions/e1f2a3b4c5d6_rebuild_baseline.py
index d17f696..17848e0 100644
--- a/migrations/versions/e1f2a3b4c5d6_rebuild_baseline.py
+++ b/migrations/versions/e1f2a3b4c5d6_rebuild_baseline.py
@@ -36,28 +36,19 @@ DEVELOPER_ROLE_ID = "0000000000000000000000000B"
 
 PERMISSIONS: list[tuple[str, str, str]] = [
     # (permission_code, permission_name, module_code)
-    ("dashboard.view", "查看工作台", "dashboard"),
-    ("script.build", "构建脚本", "script"),
-    ("script.public.manage", "管理公共脚本", "script"),
-    ("schedule.own", "管理本人调度", "schedule"),
-    ("schedule.all", "管理全部调度", "schedule"),
-    ("experiment.own", "管理本人实验", "experiment"),
-    ("experiment.all", "管理全部实验", "experiment"),
-    ("resource.personal", "管理个人资源", "resource"),
-    ("resource.public.upload", "上传公共资源", "resource"),
-    ("resource.public.manage", "管理公共资源", "resource"),
-    ("system.view", "查看系统管理", "system"),
-    ("system.manage", "管理系统配置", "system"),
+    ("dashboard:view", "查看工作台", "dashboard"),
+    ("script:view", "查看构建脚本", "script"),
+    ("schedule:view", "查看调度配置", "schedule"),
+    ("system:view", "查看系统管理", "system"),
+    ("system:user:view", "查看用户管理", "system"),
+    ("system:project:view", "查看项目管理", "system"),
 ]
 
-# developer gets *.own + personal resource only; no system.*, no *.all.
+# developer gets menu-view permissions only; no system:* (admin-only).
 DEVELOPER_PERMISSION_CODES: list[str] = [
-    "dashboard.view",
-    "script.build",
-    "script.public.manage",
-    "schedule.own",
-    "experiment.own",
-    "resource.personal",
+    "dashboard:view",
+    "script:view",
+    "schedule:view",
 ]
 
 ADMIN_PERMISSION_CODES: list[str] = [code for code, _, _ in PERMISSIONS]
@@ -334,7 +325,6 @@ def upgrade() -> None:
     sa.Column('created_at', mysql.DATETIME(fsp=3), server_default=sa.text('CURRENT_TIMESTAMP(3)'), nullable=False),
     sa.Column('updated_at', mysql.DATETIME(fsp=3), server_default=sa.text('CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3)'), nullable=False),
     sa.Column('owner_user_id', mysql.CHAR(length=26), nullable=True),
-    sa.Column('parent_object_id', mysql.CHAR(length=26), nullable=True),
     sa.Column('relative_path', sa.String(length=1024), nullable=True, comment='Workspace 相对路径'),
     sa.Column('path_hash', sa.BINARY(length=32), nullable=True, comment='SHA-256(relative_path)，由应用写入'),
     sa.Column('bucket_name', sa.String(length=128), nullable=True),
@@ -349,12 +339,11 @@ def upgrade() -> None:
     sa.Column('deleted_at', mysql.DATETIME(fsp=3), nullable=True),
     sa.Column('trash_key', sa.String(length=1100), nullable=True, comment="Path inside the trash bucket where the soft-deleted bytes live. Format: '{source_bucket}/{object_key}' so a restore is a same-key copy back to the source bucket. NULL while the row is still available."),
     sa.PrimaryKeyConstraint('storage_object_id'),
-    comment='Workspace 文件和 RustFS 对象的统一元数据'
+    comment='Workspace 文件和 RustFS 对象的统一元数据;目录树走 materialized path (relative_path),不要 join 邻接表列——已删除。'
     )
     op.create_index('fk_storage_created_by', 'storage_objects', ['created_by'], unique=False)
     op.create_index('idx_storage_content_hash', 'storage_objects', ['content_hash'], unique=False)
     op.create_index('idx_storage_owner', 'storage_objects', ['owner_user_id', 'object_status'], unique=False)
-    op.create_index('idx_storage_parent', 'storage_objects', ['parent_object_id'], unique=False)
     op.create_index('idx_storage_workspace_path', 'storage_objects', ['workspace_id', 'storage_backend', 'path_hash'], unique=False)
     op.create_index('idx_storage_workspace_usage', 'storage_objects', ['workspace_id', 'usage_type', 'object_status'], unique=False)
     op.create_index('uk_storage_bucket_key_active', 'storage_objects', ['storage_backend', 'bucket_name', 'object_key_hash_active'], unique=True)
@@ -693,7 +682,6 @@ def downgrade() -> None:
     op.drop_index('idx_storage_workspace_usage', table_name='storage_objects')
     op.drop_index('idx_storage_workspace_relative_path', table_name='storage_objects')
     op.drop_index('idx_storage_workspace_path', table_name='storage_objects')
-    op.drop_index('idx_storage_parent', table_name='storage_objects')
     op.drop_index('idx_storage_owner', table_name='storage_objects')
     op.drop_index('idx_storage_content_hash', table_name='storage_objects')
     op.drop_index('fk_storage_created_by', table_name='storage_objects')
diff --git a/migrations/versions/f7a8b9c0d1e2_drop_storage_parent.py b/migrations/versions/f7a8b9c0d1e2_drop_storage_parent.py
deleted file mode 100644
index fba2605..0000000
--- a/migrations/versions/f7a8b9c0d1e2_drop_storage_parent.py
+++ /dev/null
@@ -1,56 +0,0 @@
-"""drop dead storage_objects.parent_object_id column and idx_storage_parent
-
-Revision ID: f7a8b9c0d1e2
-Revises: e1f2a3b4c5d6
-Create Date: 2026-08-21
-
-Removes a never-written column and its orphaned index. Tree structure is
-maintained entirely via relative_path (materialized path); see
-backend/src/backend/scripts.py (list_workspace_tree / list_workspace_directories).
-
-MySQL 8.0 does not support DROP INDEX IF EXISTS / DROP COLUMN IF EXISTS,
-so the calls below are unconditional.
-"""
-
-from collections.abc import Sequence
-
-import sqlalchemy as sa
-from alembic import op
-from sqlalchemy.dialects import mysql
-
-# revision identifiers, used by Alembic.
-revision: str = "f7a8b9c0d1e2"
-down_revision: str | Sequence[str] | None = "e1f2a3b4c5d6"
-branch_labels: str | Sequence[str] | None = None
-depends_on: str | Sequence[str] | None = None
-
-
-def upgrade() -> None:
-    """Drop the dead index, then the dead column."""
-    op.drop_index("idx_storage_parent", table_name="storage_objects")
-    op.drop_column("storage_objects", "parent_object_id")
-    # Refresh the table comment so the warning reaches the DB, not just the ORM.
-    op.execute(
-        "ALTER TABLE storage_objects "
-        "COMMENT = 'Workspace 文件和 RustFS 对象的统一元数据;"
-        "目录树走 materialized path (relative_path),"
-        "不要 join 邻接表列——已删除。'"
-    )
-
-
-def downgrade() -> None:
-    """Recreate the column and index for rollback."""
-    op.add_column(
-        "storage_objects",
-        sa.Column("parent_object_id", mysql.CHAR(length=26), nullable=True),
-    )
-    op.create_index(
-        "idx_storage_parent",
-        "storage_objects",
-        ["parent_object_id"],
-        unique=False,
-    )
-    op.execute(
-        "ALTER TABLE storage_objects "
-        "COMMENT = 'Workspace 文件和 RustFS 对象的统一元数据'"
-    )
\ No newline at end of file