From f13a1bb7feb271e02a85cf545b8b3e4e376ef32a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=91=A3=E5=AE=8F=E5=87=AF?= <hkdong@kland.com.cn>
Date: Sun, 21 Jun 2026 17:17:19 +0800
Subject: [PATCH] =?UTF-8?q?feat(roundtable):=20=E4=B8=9A=E5=8A=A1=E9=93=BE?=
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- 后端 store/路由：scope=all（仅管理员）列全量；get/update/delete 加 is_admin 旁路，管理员可操作任意 owner 链条且不转移归属；非管理员请求 all 退化为 mine
- 前端列表页/会商弹窗：管理员多「全部链条」筛选 tab，canManage=isAdmin||isMine 放开发布/设置/删除
- 编辑器：管理员可见发布按钮；按 chainId 找不到本地列表时直接 getChain 拉取（修复管理员从「全部链条」进编辑器空白），并修掉自身无链条时加载卡死的边界

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 .../src/roundtable-planning/api/chains.ts     | 11 ++++--
 .../components/BusinessChainListDialog.tsx    | 24 ++++++++-----
 .../pages/BusinessChainEditorPage.tsx         | 29 +++++++++++----
 .../pages/BusinessChainListPage.tsx           | 23 ++++++++----
 .../app/gateway/routers/roundtable_chains.py  | 35 ++++++++++++++----
 .../persistence/roundtable_chains/sql.py      | 36 +++++++++++--------
 6 files changed, 113 insertions(+), 45 deletions(-)

diff --git a/frontend-web/src/roundtable-planning/api/chains.ts b/frontend-web/src/roundtable-planning/api/chains.ts
index 6138efef..b57bf26d 100644
--- a/frontend-web/src/roundtable-planning/api/chains.ts
+++ b/frontend-web/src/roundtable-planning/api/chains.ts
@@ -54,8 +54,13 @@ export interface ChainUpdatePayload {
   isPublic?: boolean;
 }
 
-/** 列表筛选范围：`mine` = 我的；`public` = 所有已发布的公共链条。 */
-export type ChainScope = "mine" | "public";
+/**
+ * 列表筛选范围：
+ *  - `mine` = 我的；
+ *  - `public` = 所有已发布的公共链条；
+ *  - `all` = 所有账号的全部链条（**仅管理员**；后端对非管理员请求 `all` 退化为 `mine`）。
+ */
+export type ChainScope = "mine" | "public" | "all";
 
 const BASE = () => `${getBackendBaseURL()}/api/roundtable-chains`;
 
@@ -146,7 +151,7 @@ function fromUpdate(p: ChainUpdatePayload) {
  *  - `"public"`：所有已发布的公共链条（任何账号可见 / 可选入研讨）。
  */
 export async function listChains(scope: ChainScope = "mine"): Promise<BusinessChain[]> {
-  const url = scope === "public" ? `${BASE()}?scope=public` : BASE();
+  const url = scope === "mine" ? BASE() : `${BASE()}?scope=${scope}`;
   const res = await apiFetch(url, { method: "GET" });
   const data = await readJson<{ chains: ServerChain[] }>(res, "list chains");
   return (data.chains ?? []).map(toChain);
diff --git a/frontend-web/src/roundtable-planning/components/BusinessChainListDialog.tsx b/frontend-web/src/roundtable-planning/components/BusinessChainListDialog.tsx
index 1b813bda..04353b30 100644
--- a/frontend-web/src/roundtable-planning/components/BusinessChainListDialog.tsx
+++ b/frontend-web/src/roundtable-planning/components/BusinessChainListDialog.tsx
@@ -31,6 +31,7 @@ import {
 import { cn } from "@/lib/utils";
 import { useDesensitizeSubtree } from "@/roundtable-planning/lib/use-desensitize-subtree";
 
+import { getStoredAuth } from "@/core/auth";
 import { listAgents } from "@/core/agents";
 
 import { listChains, setChainPublic, type ChainScope } from "../api/chains";
@@ -71,7 +72,9 @@ export function BusinessChainListBody({
   const [chains, setChains] = useState<BusinessChain[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
-  // 筛选：我的 / 公共（已发布）。
+  // 管理员：额外多一个「全部」筛选，且可编辑 / 发布任意账号的链条。
+  const isAdmin = getStoredAuth()?.system_role === "admin";
+  // 筛选：我的 / 公共（已发布）/（管理员）全部。
   const [scope, setScope] = useState<ChainScope>("mine");
   const [publishingId, setPublishingId] = useState<string | null>(null);
   // 实时名称表（id 小写 → 最新 name）：用于把席位的落库快照名刷新成最新（agent 改名同步）。
@@ -147,9 +150,9 @@ export function BusinessChainListBody({
 
   return (
     <>
-      {/* 筛选：我的 / 公共 */}
+      {/* 筛选：我的 / 公共 /（管理员）全部 */}
       <div className="shrink-0 flex items-center gap-1 rounded-lg border border-border bg-muted/40 p-0.5 self-start">
-        {(["mine", "public"] as const).map((s) => (
+        {((isAdmin ? ["mine", "public", "all"] : ["mine", "public"]) as ChainScope[]).map((s) => (
           <button
             key={s}
             type="button"
@@ -161,7 +164,7 @@ export function BusinessChainListBody({
                 : "text-muted-foreground hover:text-foreground",
             )}
           >
-            {s === "mine" ? "我的" : "公共"}
+            {s === "mine" ? "我的" : s === "public" ? "公共" : "全部"}
           </button>
         ))}
       </div>
@@ -195,6 +198,7 @@ export function BusinessChainListBody({
               <ChainRow
                 key={chain.id}
                 chain={chain}
+                canManage={isAdmin || chain.isMine !== false}
                 nameById={nameById}
                 publishing={publishingId === chain.id}
                 onSettings={() => onConfigure(chain.id)}
@@ -245,18 +249,20 @@ export function BusinessChainListDialog({
 
 function ChainRow({
   chain,
+  canManage,
   nameById,
   publishing,
   onSettings,
   onTogglePublic,
 }: {
   chain: BusinessChain;
+  /** 能否编辑 / 发布（本人链条 或 管理员）。 */
+  canManage: boolean;
   nameById: Map<string, string>;
   publishing: boolean;
   onSettings: () => void;
   onTogglePublic: () => void;
 }) {
-  const isMine = chain.isMine !== false;
   // 配置者用户名：后端返回 email，展示时取 @ 前的本地部分更像「用户名」。
   const ownerName = chain.ownerName ? chain.ownerName.split("@")[0] : "";
   return (
@@ -274,8 +280,8 @@ function ChainRow({
           </span>
         )}
         <div className="ml-auto flex shrink-0 items-center gap-1.5">
-          {/* 发布 / 取消发布：仅本人的链条可操作。 */}
-          {isMine && (
+          {/* 发布 / 取消发布：本人的链条或管理员可操作。 */}
+          {canManage && (
             <Button
               variant={chain.isPublic ? "secondary" : "outline"}
               size="sm"
@@ -291,8 +297,8 @@ function ChainRow({
               {chain.isPublic ? "取消发布" : "发布"}
             </Button>
           )}
-          {/* 设置（编辑）：仅本人的链条；公共里别人的链条只读浏览。 */}
-          {isMine && (
+          {/* 设置（编辑）：本人的链条或管理员；普通用户看别人的链条只读浏览。 */}
+          {canManage && (
             <Button
               variant="ghost"
               size="sm"
diff --git a/frontend-web/src/roundtable-planning/pages/BusinessChainEditorPage.tsx b/frontend-web/src/roundtable-planning/pages/BusinessChainEditorPage.tsx
index 192e4f07..737f4586 100644
--- a/frontend-web/src/roundtable-planning/pages/BusinessChainEditorPage.tsx
+++ b/frontend-web/src/roundtable-planning/pages/BusinessChainEditorPage.tsx
@@ -78,6 +78,7 @@ import { useDesensitizeSubtree } from "@/roundtable-planning/lib/use-desensitize
 import { TagSearchBar } from "@/components/workspace/tags/tag-search-bar";
 import { ModelNameSelect } from "@/components/workspace/model-name-select";
 import { listAgents } from "@/core/agents";
+import { getStoredAuth } from "@/core/auth";
 
 import {
   filterRecommendCandidates,
@@ -86,6 +87,7 @@ import {
 import {
   createChain,
   deleteChain,
+  getChain,
   listChains,
   optimizeChainPrompt,
   setChainPublic,
@@ -171,6 +173,8 @@ export default function BusinessChainEditorPage() {
   // 当前编辑链条的发布状态 / 是否本人所有（发布按钮 + 只读保护用）。
   const [currentChainPublic, setCurrentChainPublic] = useState(false);
   const [currentChainMine, setCurrentChainMine] = useState(true);
+  // 管理员：可编辑 / 发布 / 删除任意账号的链条（与「全部链条」筛选配套）。
+  const isAdmin = getStoredAuth()?.system_role === "admin";
   const [publishing, setPublishing] = useState(false);
   const [title, setTitle] = useState("");
   const [description, setDescription] = useState("");
@@ -330,10 +334,23 @@ export default function BusinessChainEditorPage() {
     if (appliedChainParamRef.current) return;
     const chainId = searchParams.get("chainId");
     if (!chainId) return;
-    if (chains.length === 0) return; // 等 refreshChains 拉回列表
-    const chain = chains.find((c) => c.id === chainId);
-    if (chain) loadChain(chain);
-    appliedChainParamRef.current = true; // 命中或链条已不存在，都不再重试
+    appliedChainParamRef.current = true; // 只应用一次，之后不覆盖用户手动切换
+    // 优先用「我的链条」列表里已拉到的对象（省一次请求）；不在列表里（管理员从「全部链条」
+    // 点设置 / 公共链条 / 自己没有任何链条）则直接按 id 拉取。后端对管理员放开任意链条、
+    // 对所有人放开已发布公共链条；拉不到则静默保持空白新建态。
+    const local = chains.find((c) => c.id === chainId);
+    if (local) {
+      loadChain(local);
+      return;
+    }
+    void (async () => {
+      try {
+        const chain = await getChain(chainId);
+        if (chain) loadChain(chain);
+      } catch {
+        // 静默：取不到就保持当前（空白）状态。
+      }
+    })();
   }, [chains, searchParams, loadChain]);
 
   // ─── 席位增删改（全部委托给 lib/chain-stages 纯函数）────────────────────
@@ -987,8 +1004,8 @@ export default function BusinessChainEditorPage() {
 
         {/* 右侧操作 */}
         <div className="ml-auto flex items-center gap-2">
-          {/* 发布 / 取消发布：仅已保存且本人所有的链条。发布后所有账号可在「公共」筛选查看 / 选用。 */}
-          {currentChainId && currentChainMine && (
+          {/* 发布 / 取消发布：已保存且本人所有（或管理员）的链条。发布后所有账号可在「公共」筛选查看 / 选用。 */}
+          {currentChainId && (currentChainMine || isAdmin) && (
             <button
               type="button"
               onClick={handleTogglePublish}
diff --git a/frontend-web/src/roundtable-planning/pages/BusinessChainListPage.tsx b/frontend-web/src/roundtable-planning/pages/BusinessChainListPage.tsx
index cc7bc3cf..9ec2075c 100644
--- a/frontend-web/src/roundtable-planning/pages/BusinessChainListPage.tsx
+++ b/frontend-web/src/roundtable-planning/pages/BusinessChainListPage.tsx
@@ -61,6 +61,7 @@ import {
   DialogHeader,
   DialogTitle,
 } from "@/components/ui/dialog";
+import { getStoredAuth } from "@/core/auth";
 import { useRouteNavigate } from "@/core/route-base";
 import { cn } from "@/lib/utils";
 import { useDesensitizeSubtree } from "@/roundtable-planning/lib/use-desensitize-subtree";
@@ -83,6 +84,8 @@ export default function BusinessChainListPage() {
   const navigate = useRouteNavigate();
   // 整片脱敏：链条列表页展示文本（链条名/描述/席位名/标题）。
   const dzRef = useDesensitizeSubtree<HTMLDivElement>();
+  // 管理员：额外多一个「全部链条」筛选，且可编辑 / 发布 / 删除任意账号的链条。
+  const isAdmin = getStoredAuth()?.system_role === "admin";
 
   // 进入编辑器：带 chainId = 打开并切到该链条；不带 = 空白新建。
   // 路径写 workspace base，`useRouteNavigate` 会按当前路由 base 改写。
@@ -314,13 +317,14 @@ export default function BusinessChainListPage() {
 
           {/* 筛选工具栏 */}
           <div className="mb-6 flex flex-col gap-4 rounded-2xl border border-zinc-100 bg-white p-4 shadow-sm dark:border-[#1A2F5A] dark:bg-[#122347] lg:flex-row lg:items-center lg:justify-between">
-            {/* 我的 / 公共 */}
+            {/* 我的 / 公共 /（管理员）全部 */}
             <div className="flex self-start rounded-xl bg-zinc-100 p-1 dark:bg-[#0C1836]">
               {(
                 [
                   ["mine", "我的链条"],
                   ["public", "公共列表"],
-                ] as const
+                  ...(isAdmin ? ([["all", "全部链条"]] as const) : []),
+                ] as [ChainScope, string][]
               ).map(([key, label]) => (
                 <button
                   key={key}
@@ -439,6 +443,7 @@ export default function BusinessChainListPage() {
                   <ChainCard
                     key={chain.id}
                     chain={chain}
+                    canManage={isAdmin || chain.isMine !== false}
                     publishing={publishingId === chain.id}
                     onSettings={() => goConfigure(chain.id)}
                     onTogglePublic={() => handleTogglePublic(chain)}
@@ -450,6 +455,7 @@ export default function BusinessChainListPage() {
           ) : (
             <ChainTable
               chains={visibleChains}
+              canManage={isAdmin}
               publishingId={publishingId}
               onSettings={(c) => goConfigure(c.id)}
               onTogglePublic={handleTogglePublic}
@@ -620,18 +626,20 @@ function EmptyState({
 
 function ChainCard({
   chain,
+  canManage,
   publishing,
   onSettings,
   onTogglePublic,
   onDelete,
 }: {
   chain: BusinessChain;
+  /** 能否编辑 / 发布 / 删除（本人链条 或 管理员）。 */
+  canManage: boolean;
   publishing: boolean;
   onSettings: () => void;
   onTogglePublic: () => void;
   onDelete: () => void;
 }) {
-  const isMine = chain.isMine !== false;
   const ownerName = chain.ownerName ? chain.ownerName.split("@")[0] : "";
 
   return (
@@ -685,8 +693,8 @@ function ChainCard({
             </div>
           </div>
 
-          {/* 操作按钮：仅本人链条可发布 / 设置 / 删除（公共里别人的链条只读浏览）。 */}
-          {isMine && (
+          {/* 操作按钮：本人链条或管理员可发布 / 设置 / 删除（普通用户看别人的链条只读浏览）。 */}
+          {canManage && (
             <div className="flex shrink-0 items-center gap-1 opacity-80 transition-opacity group-hover:opacity-100">
               <button
                 type="button"
@@ -892,12 +900,15 @@ function dotClass(avatarType: string): string {
 
 function ChainTable({
   chains,
+  canManage,
   publishingId,
   onSettings,
   onTogglePublic,
   onDelete,
 }: {
   chains: BusinessChain[];
+  /** 管理员：可管理任意链条（即使非本人）。 */
+  canManage: boolean;
   publishingId: string | null;
   onSettings: (c: BusinessChain) => void;
   onTogglePublic: (c: BusinessChain) => void;
@@ -919,7 +930,7 @@ function ChainTable({
           </thead>
           <tbody className="divide-y divide-zinc-100 text-xs text-zinc-800 dark:divide-[#1A2F5A] dark:text-[#C5CFE0]">
             {chains.map((chain) => {
-              const isMine = chain.isMine !== false;
+              const isMine = canManage || chain.isMine !== false;
               const ownerName = chain.ownerName ? chain.ownerName.split("@")[0] : "—";
               return (
                 <tr
diff --git a/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py b/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py
index b06926ee..60ce2c1d 100644
--- a/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py
+++ b/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py
@@ -6,11 +6,15 @@ following this order. Bound to the requesting user (not the browser), so it
 follows the account across devices/sessions — same model as roundtable drafts.
 
 Routes (prefix ``/api/roundtable-chains``):
-    GET    ""               list current user's chains (full records, incl. seats)
+    GET    ""               list chains (``scope=mine``默认 / ``public`` / ``all`` 仅管理员)
     POST   ""               create a chain
     GET    "/{chain_id}"    one chain
     PUT    "/{chain_id}"    partial update (title / description / seats)
     DELETE "/{chain_id}"    delete
+
+管理员权限：``system_role == "admin"`` 的用户（``_is_admin``）可 list ``scope=all``
+（所有账号的全部链条），并可 get / 编辑 / 发布 / 删除**任意** owner 的链条；非管理员
+仍仅限本人链条（``scope=all`` 退化为 ``mine``）。编辑/删除不转移链条归属（``user_id`` 不变）。
 """
 
 from __future__ import annotations
@@ -131,6 +135,18 @@ def _current_user_id(request: Request) -> str:
     return get_effective_user_id()
 
 
+def _is_admin(request: Request) -> bool:
+    """当前请求是否为管理员。
+
+    认证关闭时 ``request.state.user`` 为 None（单一 default 用户，mine 即 all），
+    按管理员处理（与 menu_overrides 等放行约定一致，无越权风险）。
+    """
+    user = getattr(request.state, "user", None)
+    if user is None:
+        return True
+    return getattr(user, "system_role", None) == "admin"
+
+
 async def _enrich_owner_names(rows: list[dict]) -> None:
     """把每行的 ``owner_id`` 解析成可读用户名（email），写入 ``owner_name``。
 
@@ -269,13 +285,18 @@ async def list_chains(request: Request, scope: str = "mine") -> ChainListRespons
 
     ``scope`` 查询参数(筛选):
       - ``mine``（默认）：仅当前用户自己的链条；
-      - ``public``：所有**已发布**的公共链条（任何账号均可查看 / 选入研讨）。
+      - ``public``：所有**已发布**的公共链条（任何账号均可查看 / 选入研讨）；
+      - ``all``：所有账号的全部链条（**仅管理员**；非管理员请求 ``all`` 退化为 ``mine``）。
     其余值按 ``mine`` 处理。
     """
-    normalized_scope = scope if scope in ("mine", "public") else "mine"
+    is_admin = _is_admin(request)
+    normalized_scope = scope if scope in ("mine", "public", "all") else "mine"
+    # 非管理员请求 all → 退化为 mine，绝不越权。
+    if normalized_scope == "all" and not is_admin:
+        normalized_scope = "mine"
     store = _get_store(request)
     user_id = _current_user_id(request)
-    rows = await store.list_chains(user_id, scope=normalized_scope)
+    rows = await store.list_chains(user_id, scope=normalized_scope, is_admin=is_admin)
     await _enrich_owner_names(rows)
     return ChainListResponse(chains=[ChainResponse(**r) for r in rows])
 
@@ -310,7 +331,7 @@ async def create_chain(request: Request, body: ChainCreateRequest) -> ChainRespo
 async def get_chain(request: Request, chain_id: str) -> ChainResponse:
     store = _get_store(request)
     user_id = _current_user_id(request)
-    row = await store.get_chain(chain_id, user_id)
+    row = await store.get_chain(chain_id, user_id, is_admin=_is_admin(request))
     if row is None:
         raise HTTPException(status_code=404, detail="Chain not found")
     await _enrich_owner_names([row])
@@ -334,7 +355,7 @@ async def update_chain(request: Request, chain_id: str, body: ChainUpdateRequest
     user_id = _current_user_id(request)
     # Distinguish "omitted" from "explicitly sent"; only forward provided fields.
     fields = body.model_dump(exclude_unset=True)
-    row = await store.update_chain(chain_id, user_id, **fields)
+    row = await store.update_chain(chain_id, user_id, is_admin=_is_admin(request), **fields)
     if row is None:
         raise HTTPException(status_code=404, detail="Chain not found")
     await _enrich_owner_names([row])
@@ -345,7 +366,7 @@ async def update_chain(request: Request, chain_id: str, body: ChainUpdateRequest
 async def delete_chain(request: Request, chain_id: str) -> None:
     store = _get_store(request)
     user_id = _current_user_id(request)
-    deleted = await store.delete_chain(chain_id, user_id)
+    deleted = await store.delete_chain(chain_id, user_id, is_admin=_is_admin(request))
     if not deleted:
         raise HTTPException(status_code=404, detail="Chain not found")
 
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/persistence/roundtable_chains/sql.py b/offline-backend-20260512/backend/packages/harness/deerflow/persistence/roundtable_chains/sql.py
index 99c3ef2e..756eca86 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/persistence/roundtable_chains/sql.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/persistence/roundtable_chains/sql.py
@@ -70,36 +70,41 @@ class RoundtableChainRepository:
         }
 
     async def list_chains(
-        self, user_id: str, *, scope: str = "mine", limit: int = 200
+        self, user_id: str, *, scope: str = "mine", limit: int = 200, is_admin: bool = False
     ) -> list[dict[str, Any]]:
         """列出链条。
 
         ``scope``:
           - ``"mine"``（默认）：仅当前用户自己的链条；
-          - ``"public"``：所有**已发布**（``is_public=True``）链条，含本人发布的。
+          - ``"public"``：所有**已发布**（``is_public=True``）链条，含本人发布的；
+          - ``"all"``：所有账号的全部链条（**仅管理员**，由路由层校验后传 ``is_admin=True``；
+            非管理员误传则按 ``"mine"`` 退化，绝不越权）。
         其余值按 ``"mine"`` 处理。``is_mine`` 标记每条是否本人所有，供前端判断可否编辑。
         """
         if scope == "public":
             cond = RoundtableChainRow.is_public.is_(True)
+        elif scope == "all" and is_admin:
+            cond = None
         else:
             cond = RoundtableChainRow.user_id == user_id
-        stmt = (
-            select(RoundtableChainRow)
-            .where(cond)
-            .order_by(RoundtableChainRow.updated_at.desc())
-            .limit(limit)
-        )
+        stmt = select(RoundtableChainRow)
+        if cond is not None:
+            stmt = stmt.where(cond)
+        stmt = stmt.order_by(RoundtableChainRow.updated_at.desc()).limit(limit)
         async with self._sf() as session:
             result = await session.execute(stmt)
             return [self._to_dict(row, user_id) for row in result.scalars()]
 
-    async def get_chain(self, chain_id: str, user_id: str) -> dict[str, Any] | None:
-        """取一条链条：owner 可见,**已发布的公共链条任何人可见**(供选入研讨)。"""
+    async def get_chain(
+        self, chain_id: str, user_id: str, *, is_admin: bool = False
+    ) -> dict[str, Any] | None:
+        """取一条链条：owner 可见,**已发布的公共链条任何人可见**(供选入研讨)；
+        **管理员可见任意链条**(``is_admin=True``，供后台管理配置)。"""
         async with self._sf() as session:
             row = await session.get(RoundtableChainRow, chain_id)
             if row is None:
                 return None
-            if row.user_id != user_id and not bool(getattr(row, "is_public", False)):
+            if not is_admin and row.user_id != user_id and not bool(getattr(row, "is_public", False)):
                 return None
             return self._to_dict(row, user_id)
 
@@ -140,10 +145,12 @@ class RoundtableChainRepository:
         seat_mode=_UNSET,
         gather_first=_UNSET,
         is_public=_UNSET,
+        is_admin: bool = False,
     ) -> dict[str, Any] | None:
         async with self._sf() as session:
             row = await session.get(RoundtableChainRow, chain_id)
-            if row is None or row.user_id != user_id:
+            # 管理员可改任意链条；否则仅 owner 本人。不变更 user_id（不转移归属）。
+            if row is None or (not is_admin and row.user_id != user_id):
                 return None
             if title is not _UNSET and title is not None:
                 row.title = str(title).strip()
@@ -168,10 +175,11 @@ class RoundtableChainRepository:
             await session.refresh(row)
             return self._to_dict(row, user_id)
 
-    async def delete_chain(self, chain_id: str, user_id: str) -> bool:
+    async def delete_chain(self, chain_id: str, user_id: str, *, is_admin: bool = False) -> bool:
         async with self._sf() as session:
             row = await session.get(RoundtableChainRow, chain_id)
-            if row is None or row.user_id != user_id:
+            # 管理员可删任意链条；否则仅 owner 本人。
+            if row is None or (not is_admin and row.user_id != user_id):
                 return False
             await session.delete(row)
             await session.commit()