diff --git a/CHANGELOG.md b/CHANGELOG.md
index 34726279..2ccd1f70 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # 印度占星 Skill 更新日志
 
+## 2026-10-20 — 后台可以修改并删除已发布模型
+
+- 编辑已发布或已下线的模型会另存成下一版草稿，当前线上版本保持不变。更换供应商模型时，显示名跟着新模型走。
+- 模型版本列表可以删除草稿、已发布和已下线版本。还有其他已发布模型时，不能删掉当前默认模型。已经绑定被删版本的会话不能继续提问。
+- Skill 版本不变。新增迁移 `20261020150000_admin_model_version_draft_and_delete.sql`。
+
 ## 2026-10-20 — 完整合盘报告定价 19 点
 
 - `synastry.full` 按标准、高级、内部三个模型档发布，每份 19 点。某一档已经有生效价格时，迁移不再覆盖。Skill 版本不变。
diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index 66a9cfe3..dc3e1e37 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -36936,3 +36936,19 @@
 - 复发自：无。
 - 修复版本：分支 `codex/synastry-page-dynamic-20261020`。
 
+
+## BUG-1398 | 后台保存已发布模型报「提交内容不符合业务约束」，也不能删除
+
+- 状态：resolved（本地修复，待提交）
+- 首次发现：2026-10-20
+- 最近更新：2026-10-20
+- 影响面：后台模型配置 `POST /api/admin/models` 的 `saveDraft` / `delete`，`admin_save_model_draft`、`admin_delete_model_version`，模型管理页。
+- 用户现象：编辑已有模型并保存草稿时，接口返回「提交内容不符合业务约束」。列表里也不能删除已发布模型。
+- 触发条件：对状态不是草稿的版本调用 `action=saveDraft` 并带上该版本 id。管理页每一行都写成「编辑草稿」，已发布行走同一条保存。
+- 根因：`admin_save_model_draft` 只更新 `status='draft'` 的行。已发布或已下线的版本更新不到，抛出 `model_draft_not_found`（PostgreSQL `22023`）。`adminErrorResponse` 把 `22023` / `23514` / `23505` 收成同一句「提交内容不符合业务约束」。删除入口不存在；`model_publish_events` 对版本 id 是 `ON DELETE RESTRICT`，直接删版本行也会被挡住。
+- 修复：保存已发布或已下线版本时，更新同一模型已有草稿，没有则插入下一版草稿，不改当前线上行。新增 `admin_delete_model_version`：先删掉引用该版本的发布事件，再删除版本；最后一个版本连同模型配置一起删除。若它是当前默认模型且还有其他已发布模型，拒绝删除并提示先改默认。其他模型把回退指向已无已发布版本的模型时，回退清空。更换供应商模型时，显示名改用新模型名。上述异常映射成可读错误，不再落进笼统业务约束。
+- 验证：见 `docs/tasks/PROGRESS-model-admin-draft-delete-20261020.md`。数据库回归覆盖：用已发布版本 id 保存得到新草稿且原行不变，再次保存更新同一草稿；删除草稿；还有其他已发布模型时删除默认模型失败；删除已发布非默认模型后发布事件消失、回退被清空；删掉同模型剩余草稿后配置消失；只剩这一个已发布模型时可以删除。
+- 防复发：后台模型写路径必须区分草稿与已发布。已发布模型的保存不得要求调用方先手建草稿，也不得改正在线上的那一行。`model_draft_not_found`、`model_version_not_found`、`model_default_required` 不得再折叠成「提交内容不符合业务约束」。删除已发布版本要先处理 `model_publish_events` 的限制外键。还有其他已发布模型时，不得删掉唯一的默认模型。
+- 相关记录：BUG-275（商品保存已发布 id 被折叠成同一句错误）。
+- 复发自：无。同型问题曾出现在商品目录，模型保存未一起改。
+- 修复版本：分支 `codex/model-admin-draft-delete-20261020`，未提交。
diff --git a/docs/tasks/PROGRESS-model-admin-draft-delete-20261020.md b/docs/tasks/PROGRESS-model-admin-draft-delete-20261020.md
new file mode 100644
index 00000000..704ad5d7
--- /dev/null
+++ b/docs/tasks/PROGRESS-model-admin-draft-delete-20261020.md
@@ -0,0 +1,19 @@
+# 后台已发布模型另存草稿并删除
+
+- 基线：`origin/staging` `dac6b7fae`
+- 分支：`codex/model-admin-draft-delete-20261020`
+- 记录：BUG-1398
+
+## 做了什么
+
+编辑已发布或已下线模型时，保存写入下一版草稿，不改当前线上行。同一模型已有草稿时，再次保存更新那份草稿。
+
+模型版本可以删除。草稿、已发布、已下线都从列表消失。还有其他已发布模型时，不能删除当前默认模型。已经绑定被删版本的会话之后不能继续提问。更换下拉里的供应商模型时，显示名跟着新模型走。
+
+## 测试
+
+- `tsc --noEmit`：0 错。
+- 改动文件 `eslint`：0 error。
+- `admin-model-management-ui-contract`、`admin-auth`、`high-risk-billing-routes-contract`：27 pass，0 fail，0 cancelled。
+- `database-billing-admin`：1 pass。其中删除默认模型命中 `model_default_required`，无权限删除命中 `admin_permission_denied`。
+- 未在浏览器里打开 staging 后台。这一步要等代码推上去并部署之后，用已登录的管理账号点保存和删除。
diff --git a/docs/tasks/README.md b/docs/tasks/README.md
index bc283416..0237ef3f 100644
--- a/docs/tasks/README.md
+++ b/docs/tasks/README.md
@@ -13,6 +13,7 @@
 
 - [三份修复单整合与独立验收](PROGRESS-three-fixes-integration-20260925.md) — 2026-09-25，人物档案优先，报告与西洋盘并行；Node 22 / Linux 全量对照与断言三栏为交付硬门槛。
 - [双 agent 自动循环试点](TASK-agent-loop-pilot-20261013.md) — 2026-10-13，Claude（本开发机）规划验收 + Grok Build（产品负责人本地电脑）执行，Gitea issue 标签交接；待产品负责人做 T0/T1。
+- [后台已发布模型可另存草稿并删除](PROGRESS-model-admin-draft-delete-20261020.md) — 2026-10-20，直接执行（BUG-1398）。
 
 ## 状态板
 
diff --git a/frontend/DESIGN.md b/frontend/DESIGN.md
index 08406b6f..f1eb2ad2 100644
--- a/frontend/DESIGN.md
+++ b/frontend/DESIGN.md
@@ -852,6 +852,7 @@ admin page — so nothing here inherits the tokens above.
   sanctioned exception to the no-raw-color rule.
 - **Content width:** 1200px centred, set by antd layout, not by `.admin-scroll`.
 - **Loading:** antd `<Spin>`, outside the waiting vocabulary in section 9.
+- **Model versions (2026-10-20):** editing a published or retired row saves a new draft and leaves the live row unchanged. Delete removes that version from the list. Both use the existing antd `Modal` and link buttons; no new class.
 - **Aggregate pages (「校正统计」, 2026-09-26):** built only from antd `Card`,
   `Statistic`, `Table`, `Progress` and `Segmented` — no chart library and no new
   class. Distributions are a table whose last column is a small `Progress` bar;
diff --git a/frontend/src/app/api/admin/models/route.ts b/frontend/src/app/api/admin/models/route.ts
index 20f857ed..3c253ad6 100644
--- a/frontend/src/app/api/admin/models/route.ts
+++ b/frontend/src/app/api/admin/models/route.ts
@@ -57,6 +57,7 @@ const actionSchema = z.discriminatedUnion("action", [
   draftSchema,
   z.object({ action: z.literal("test"), versionId: z.string().uuid() }).strict(),
   z.object({ action: z.literal("publish"), versionId: z.string().uuid() }).strict(),
+  z.object({ action: z.literal("delete"), versionId: z.string().uuid() }).strict(),
   z.object({ action: z.literal("rollback"), configId: z.string().uuid(), targetVersion: z.number().int().positive() }).strict(),
 ]).superRefine((value, context) => {
   if (value.action === "saveDraft" && value.isDefault && !value.enabled) {
@@ -68,6 +69,7 @@ const modelMutationAuditReasons = {
   saveProvider: "保存模型供应商",
   saveDraft: "保存模型草稿",
   publish: "发布模型版本",
+  delete: "删除模型版本",
   rollback: "回滚模型版本",
 } as const;
 
diff --git a/frontend/src/components/admin/model-management.tsx b/frontend/src/components/admin/model-management.tsx
index 1cc71cc1..91f9b2c9 100644
--- a/frontend/src/components/admin/model-management.tsx
+++ b/frontend/src/components/admin/model-management.tsx
@@ -96,7 +96,7 @@ const modelStatusLabels: Record<string, string> = {
 };
 
 export default function ModelManagement() {
-  const { message } = App.useApp();
+  const { message, modal } = App.useApp();
   const { data: identity } = useGetIdentity<AdminIdentity>();
   const [providerForm] = Form.useForm<ProviderForm>();
   const [modelForm] = Form.useForm<ModelForm>();
@@ -225,8 +225,12 @@ export default function ModelManagement() {
   async function saveModel(values: ModelForm) {
     setSaving(true);
     try {
-      const discovered = discoveredModels.find((item) => item.id === values.providerModel);
-      const modelId = editingModel?.modelId ?? await createDiscoveredModelId(values.providerId, values.providerModel);
+      const providerModel = values.providerModel.trim();
+      const discovered = discoveredModels.find((item) => item.id === providerModel);
+      const label = (!editingModel || editingModel.providerModel !== providerModel
+        ? (discovered?.label?.trim() || providerModel)
+        : editingModel.label).slice(0, 60);
+      const modelId = editingModel?.modelId ?? await createDiscoveredModelId(values.providerId, providerModel);
       await adminRequestJson("/api/admin/models", {
         method: "POST",
         body: JSON.stringify({
@@ -234,8 +238,8 @@ export default function ModelManagement() {
           modelId,
           versionId: editingModel?.id ?? null,
           providerId: values.providerId,
-          label: editingModel?.label ?? (discovered?.label?.trim() || values.providerModel).slice(0, 60),
-          providerModel: values.providerModel.trim(),
+          label,
+          providerModel,
           creditCost: values.creditCost,
           enabled: values.enabled,
           description: editingModel?.description ?? "",
@@ -248,7 +252,9 @@ export default function ModelManagement() {
           settings: editingModel?.settings ?? {},
         }),
       });
-      message.success("模型草稿已保存");
+      message.success(editingModel && editingModel.status !== "draft"
+        ? "已保存为新版本草稿，当前已发布版本未改动"
+        : "模型草稿已保存");
       setModelOpen(false);
       await load();
     } catch (error) {
@@ -258,6 +264,35 @@ export default function ModelManagement() {
     }
   }
 
+  async function removeModel(item: ModelVersion) {
+    setActingId(item.id);
+    try {
+      await adminRequestJson("/api/admin/models", {
+        method: "POST",
+        body: JSON.stringify({ action: "delete", versionId: item.id }),
+      });
+      message.success(item.status === "draft" ? "草稿已删除" : "模型已删除");
+      await load();
+    } catch (error) {
+      message.error(error instanceof Error ? error.message : "删除失败");
+    } finally {
+      setActingId(null);
+    }
+  }
+
+  function confirmRemove(item: ModelVersion) {
+    modal.confirm({
+      title: item.status === "draft" ? "删除这份草稿？" : "删除这个模型版本？",
+      content: item.status === "published"
+        ? "它会从模型列表和用户可选模型中消失。已经绑定这个版本的会话将无法继续提问。"
+        : "它会从模型列表中消失。",
+      okText: "删除",
+      cancelText: "取消",
+      okButtonProps: { danger: true },
+      onOk: () => removeModel(item),
+    });
+  }
+
   async function act(body: Record<string, unknown>, success: string, id: string) {
     setActingId(id);
     try {
@@ -311,7 +346,8 @@ export default function ModelManagement() {
       title: "操作",
       fixed: "right",
       render: (_, item) => <Space>
-        {canWrite && <Button type="link" onClick={() => openModel(item)}>编辑草稿</Button>}
+        {canWrite && <Button type="link" onClick={() => openModel(item)}>{item.status === "draft" ? "编辑草稿" : "修改"}</Button>}
+        {canWrite && <Button type="link" danger loading={actingId === item.id} onClick={() => confirmRemove(item)}>删除</Button>}
         {canTest && <Button type="link" loading={actingId === item.id} onClick={() => void testVersion(item)}>测试此版本</Button>}
         {canPublish && item.status !== "published" && <Button type="link" disabled={item.isDefault && !item.enabled} title={item.isDefault && !item.enabled ? "默认模型必须先启用" : "发布前必须先通过此版本的短期连接测试"} loading={actingId === item.id} onClick={() => void runVersionAction("publish", item)}>发布</Button>}
         {canRollback && item.status !== "draft" && <Button type="link" danger loading={actingId === item.id} onClick={() => void runVersionAction("rollback", item)}>回滚到此版</Button>}
@@ -371,8 +407,9 @@ export default function ModelManagement() {
       </Form>
     </Modal>
 
-    <Modal title={editingModel ? `编辑 ${editingModel.modelId}` : "新增模型草稿"} open={modelOpen} width={720} okText="保存草稿" cancelText="取消" confirmLoading={saving} onOk={() => modelForm.submit()} onCancel={() => setModelOpen(false)} destroyOnHidden>
+    <Modal title={editingModel ? `${editingModel.status === "draft" ? "编辑" : "修改"} ${editingModel.modelId}` : "新增模型草稿"} open={modelOpen} width={720} okText="保存草稿" cancelText="取消" confirmLoading={saving} onOk={() => modelForm.submit()} onCancel={() => setModelOpen(false)} destroyOnHidden>
       <Form<ModelForm> form={modelForm} layout="vertical" onFinish={saveModel}>
+        {editingModel && editingModel.status !== "draft" ? <Text type="secondary">保存后会生成新版本草稿，当前已发布版本保持不变。发布新草稿后才会替换线上模型。</Text> : null}
         <Form.Item label="供应商" required>
           <Space.Compact block>
             <Form.Item name="providerId" noStyle rules={[{ required: true, message: "请选择供应商" }]}>
diff --git a/frontend/src/lib/admin/admin-error-response.ts b/frontend/src/lib/admin/admin-error-response.ts
index f7f52b6a..36ac744e 100644
--- a/frontend/src/lib/admin/admin-error-response.ts
+++ b/frontend/src/lib/admin/admin-error-response.ts
@@ -40,6 +40,15 @@ export function adminErrorResponse(error: unknown) {
   if (message.includes("product_draft_not_found")) {
     return NextResponse.json({ error: "只能编辑草稿。已发布商品请下架，或保存为新版本草稿后再发布" }, { status: 400 });
   }
+  if (message.includes("model_version_not_found")) {
+    return NextResponse.json({ error: "模型版本不存在" }, { status: 404 });
+  }
+  if (message.includes("model_draft_not_found")) {
+    return NextResponse.json({ error: "只能修改草稿。已发布模型保存后会生成新版本，不会直接改当前版本" }, { status: 400 });
+  }
+  if (message.includes("model_default_required")) {
+    return NextResponse.json({ error: "请先把另一个已发布模型设为默认，再删除这个模型" }, { status: 409 });
+  }
   if (isPostgresError(error)) {
     if (error.code === "42501") return NextResponse.json({ error: "无权执行此操作" }, { status: 403 });
     if (error.code === "40001") return NextResponse.json({ error: "资源已被其他管理员修改，请刷新后重试" }, { status: 409 });
diff --git a/frontend/src/lib/admin/model-mutation-handler.ts b/frontend/src/lib/admin/model-mutation-handler.ts
index f728b14f..b37ba2d7 100644
--- a/frontend/src/lib/admin/model-mutation-handler.ts
+++ b/frontend/src/lib/admin/model-mutation-handler.ts
@@ -2,7 +2,7 @@ import { decryptModelProviderApiKey, encryptModelProviderApiKey, modelConnection
 
 type SaveProviderAction={action:"saveProvider";id?:string|null;name:string;providerType:ModelProviderType;baseUrl?:string|null;apiKey?:string;enabled:boolean;reason:string};
 type SaveDraftAction={action:"saveDraft";modelId:string;versionId?:string|null;providerId:string;label:string;description:string;providerModel:string;modelTier:"standard"|"premium"|"internal";creditCost:number;contextWindow?:number|null;inputCostMicrousdPerMillion:number;outputCostMicrousdPerMillion:number;enabled:boolean;isDefault:boolean;fallbackModelId?:string|null;settings:Record<string,unknown>;reason:string};
-export type AdminModelMutation=SaveProviderAction|SaveDraftAction|{action:"test";versionId:string}|{action:"publish";versionId:string;reason:string}|{action:"rollback";configId:string;targetVersion:number;reason:string};
+export type AdminModelMutation=SaveProviderAction|SaveDraftAction|{action:"test";versionId:string}|{action:"publish";versionId:string;reason:string}|{action:"delete";versionId:string;reason:string}|{action:"rollback";configId:string;targetVersion:number;reason:string};
 type ProviderRow={id:string;code:string;provider_type:ModelProviderType;base_url:string|null;encrypted_api_key:string|null;enabled:boolean;version_id:string;version_enabled:boolean};
 type Dependencies={queryRows(sql:string,values?:readonly unknown[]):Promise<readonly Record<string,unknown>[]>;assertAllowedUrl(value:string):Promise<unknown>;probeAllowed(value:string,headers:Readonly<Record<string,string>>):Promise<number>;invalidateCatalog():void;environment?:Readonly<Record<string,string|undefined>>};
 const json=(body:unknown,status=200)=>Response.json(body,{status});
@@ -14,5 +14,6 @@ export async function handleAdminModelMutation(a:AdminModelMutation,c:Readonly<{
  if(a.action==="saveDraft"){const rows=await d.queryRows("select public.admin_save_model_draft($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16::jsonb,$17,$18) id",[c.actorUserId,a.modelId,a.versionId??null,a.providerId,a.label,a.description,a.providerModel,a.modelTier,a.creditCost,a.contextWindow??null,a.inputCostMicrousdPerMillion,a.outputCostMicrousdPerMillion,a.enabled,a.isDefault,a.fallbackModelId??null,JSON.stringify(a.settings),a.reason,c.requestId]);return json({data:{id:rows[0]!.id,requestId:c.requestId}});}
  if(a.action==="test"){const p=await versionProvider(d,"v.id=$1 and v.status in ('draft','published','retired')",[a.versionId]);if(!p)return json({error:"模型版本不存在"},404);const r=await probeAndRecord(p,c.actorUserId,c.requestId,d,true);if(!r.recorded)return json({error:"数据库密钥不可用"},409);return json({data:{id:p.version_id,reachable:r.success,status:r.status,secretConfigured:true,requestId:c.requestId}},r.success?200:409);}
  if(a.action==="publish"){const rows=await d.queryRows("select public.admin_publish_model($1,$2,$3,$4) id",[c.actorUserId,a.versionId,a.reason,c.requestId]);d.invalidateCatalog();return json({data:{id:rows[0]!.id,requestId:c.requestId}});}
+ if(a.action==="delete"){const rows=await d.queryRows("select public.admin_delete_model_version($1,$2,$3,$4) id",[c.actorUserId,a.versionId,a.reason,c.requestId]);d.invalidateCatalog();return json({data:{id:rows[0]!.id,requestId:c.requestId}});}
  const p=await versionProvider(d,"v.config_id=$1 and v.version=$2 and v.status='retired'",[a.configId,a.targetVersion]);if(!p)return json({error:"回滚版本不存在"},404);const r=await probeAndRecord(p,c.actorUserId,c.requestId,d);if(!r.recorded)return json({error:"回滚版本或供应商未启用，或数据库密钥不可用"},409);if(!r.success)return json({error:"回滚版本运行时连接测试失败",data:{status:r.status,requestId:c.requestId}},409);const rows=await d.queryRows("select public.admin_rollback_model($1,$2,$3,$4,$5) id",[c.actorUserId,a.configId,a.targetVersion,a.reason,c.requestId]);d.invalidateCatalog();return json({data:{id:rows[0]!.id,requestId:c.requestId}});
 }
diff --git a/frontend/supabase/migrations/20261020150000_admin_model_version_draft_and_delete.sql b/frontend/supabase/migrations/20261020150000_admin_model_version_draft_and_delete.sql
new file mode 100644
index 00000000..a3dbeca6
--- /dev/null
+++ b/frontend/supabase/migrations/20261020150000_admin_model_version_draft_and_delete.sql
@@ -0,0 +1,145 @@
+begin;
+
+-- 保存已发布或已下线版本时，不改那一行，改为更新同一模型已有草稿，或插入下一版草稿。
+-- 删除版本时先清掉发布事件：model_publish_events 对版本 id 是 ON DELETE RESTRICT。
+create or replace function public.admin_save_model_draft(
+  p_actor_user_id uuid,p_model_id text,p_version_id uuid,p_provider_id uuid,p_label text,p_description text,
+  p_provider_model text,p_model_tier text,p_credit_cost integer,p_context_window integer,
+  p_input_cost bigint,p_output_cost bigint,p_enabled boolean,p_is_default boolean,p_fallback_model_id text,
+  p_settings jsonb,p_reason text,p_request_id text
+)
+returns uuid language plpgsql security definer set search_path=''
+as $$
+declare
+  v_config_id uuid;
+  v_version integer;
+  v_id uuid;
+  v_existing public.model_config_versions%rowtype;
+begin
+  if not public.admin_has_permission(p_actor_user_id,'models.write') then
+    raise exception 'admin_permission_denied' using errcode='42501';
+  end if;
+  if char_length(btrim(coalesce(p_reason,''))) not between 1 and 500 then
+    raise exception 'admin_reason_required' using errcode='22023';
+  end if;
+  if p_is_default and not p_enabled then
+    raise exception 'default_model_disabled' using errcode='23514';
+  end if;
+  if public.model_settings_contain_secrets(coalesce(p_settings,'{}'::jsonb)) then
+    raise exception 'model_settings_secret_forbidden' using errcode='23514';
+  end if;
+  insert into public.model_configs(model_id) values(p_model_id)
+  on conflict(model_id) do update set model_id=excluded.model_id
+  returning id into v_config_id;
+  if p_version_id is null then
+    select coalesce(max(version),0)+1 into v_version from public.model_config_versions where config_id=v_config_id;
+    insert into public.model_config_versions(config_id,version,provider_id,label,description,provider_model,model_tier,
+      credit_cost,context_window,input_cost_microusd_per_million,output_cost_microusd_per_million,enabled,is_default,
+      fallback_model_id,settings,created_by)
+    values(v_config_id,v_version,p_provider_id,p_label,p_description,p_provider_model,p_model_tier,p_credit_cost,p_context_window,
+      p_input_cost,p_output_cost,p_enabled,p_is_default,nullif(btrim(p_fallback_model_id),''),coalesce(p_settings,'{}'::jsonb),p_actor_user_id)
+    returning id into v_id;
+  else
+    select * into v_existing from public.model_config_versions
+    where id=p_version_id and config_id=v_config_id
+    for update;
+    if not found then raise exception 'model_version_not_found' using errcode='22023'; end if;
+    if v_existing.status='draft' then
+      update public.model_config_versions set provider_id=p_provider_id,label=p_label,description=p_description,
+        provider_model=p_provider_model,model_tier=p_model_tier,credit_cost=p_credit_cost,context_window=p_context_window,
+        input_cost_microusd_per_million=p_input_cost,output_cost_microusd_per_million=p_output_cost,enabled=p_enabled,
+        is_default=p_is_default,fallback_model_id=nullif(btrim(p_fallback_model_id),''),settings=coalesce(p_settings,'{}'::jsonb)
+      where id=v_existing.id and status='draft'
+      returning id into v_id;
+    else
+      select id into v_id from public.model_config_versions
+      where config_id=v_config_id and status='draft'
+      for update;
+      if v_id is not null then
+        update public.model_config_versions set provider_id=p_provider_id,label=p_label,description=p_description,
+          provider_model=p_provider_model,model_tier=p_model_tier,credit_cost=p_credit_cost,context_window=p_context_window,
+          input_cost_microusd_per_million=p_input_cost,output_cost_microusd_per_million=p_output_cost,enabled=p_enabled,
+          is_default=p_is_default,fallback_model_id=nullif(btrim(p_fallback_model_id),''),settings=coalesce(p_settings,'{}'::jsonb)
+        where id=v_id and status='draft'
+        returning id into v_id;
+      else
+        select coalesce(max(version),0)+1 into v_version from public.model_config_versions where config_id=v_config_id;
+        insert into public.model_config_versions(config_id,version,provider_id,label,description,provider_model,model_tier,
+          credit_cost,context_window,input_cost_microusd_per_million,output_cost_microusd_per_million,enabled,is_default,
+          fallback_model_id,settings,created_by)
+        values(v_config_id,v_version,p_provider_id,p_label,p_description,p_provider_model,p_model_tier,p_credit_cost,p_context_window,
+          p_input_cost,p_output_cost,p_enabled,p_is_default,nullif(btrim(p_fallback_model_id),''),coalesce(p_settings,'{}'::jsonb),p_actor_user_id)
+        returning id into v_id;
+      end if;
+    end if;
+  end if;
+  insert into audit.admin_audit_logs(actor_user_id,actor_email,actor_role,action,target_type,target_id,after_value,
+    request_id,permission_used,reason)
+  select p_actor_user_id,lower(btrim(u.email)),'admin','models.draft.save','model_config_version',v_id,
+    jsonb_build_object('modelId',p_model_id,'providerId',p_provider_id,'enabled',p_enabled,'isDefault',p_is_default),
+    p_request_id,'models.write',btrim(p_reason) from identity.users u where u.id=p_actor_user_id on conflict do nothing;
+  return v_id;
+end $$;
+
+create or replace function public.admin_delete_model_version(
+  p_actor_user_id uuid, p_version_id uuid, p_reason text, p_request_id text
+)
+returns uuid language plpgsql security definer set search_path=''
+as $$
+declare
+  v_version public.model_config_versions%rowtype;
+  v_model_id text;
+begin
+  if not public.admin_has_permission(p_actor_user_id,'models.write') then
+    raise exception 'admin_permission_denied' using errcode='42501';
+  end if;
+  if char_length(btrim(coalesce(p_reason,''))) not between 1 and 500 then
+    raise exception 'admin_reason_required' using errcode='22023';
+  end if;
+  select * into v_version from public.model_config_versions where id=p_version_id for update;
+  if not found then raise exception 'model_version_not_found' using errcode='22023'; end if;
+  select model_id into v_model_id from public.model_configs where id=v_version.config_id for update;
+  if v_model_id is null then raise exception 'model_version_not_found' using errcode='22023'; end if;
+  if v_version.status='published' and v_version.enabled and v_version.is_default and exists(
+    select 1 from public.model_config_versions other
+    join public.model_providers provider on provider.id=other.provider_id
+    where other.config_id<>v_version.config_id
+      and other.status='published' and other.enabled and provider.enabled
+  ) then
+    raise exception 'model_default_required' using errcode='23514';
+  end if;
+  delete from public.model_publish_events
+  where from_version_id=p_version_id or to_version_id=p_version_id;
+  delete from public.model_config_versions where id=p_version_id;
+  update public.model_config_versions
+  set fallback_model_id=null
+  where fallback_model_id=v_model_id
+    and not exists(
+      select 1 from public.model_configs config
+      join public.model_config_versions live on live.config_id=config.id
+      where config.model_id=v_model_id and live.status='published' and live.enabled
+    );
+  if not exists(select 1 from public.model_config_versions where config_id=v_version.config_id) then
+    delete from public.model_publish_events where config_id=v_version.config_id;
+    delete from public.model_configs where id=v_version.config_id;
+  end if;
+  insert into audit.admin_audit_logs(actor_user_id,actor_email,actor_role,action,target_type,target_id,
+    before_value,after_value,request_id,permission_used,reason)
+  select p_actor_user_id,lower(btrim(u.email)),'admin','models.version.delete','model_config_version',p_version_id,
+    jsonb_build_object('modelId',v_model_id,'status',v_version.status,'enabled',v_version.enabled),
+    jsonb_build_object('modelId',v_model_id,'status','deleted'),
+    p_request_id,'models.write',btrim(p_reason)
+  from identity.users u where u.id=p_actor_user_id on conflict do nothing;
+  return p_version_id;
+end $$;
+
+revoke all on function public.admin_delete_model_version(uuid,uuid,text,text) from public, anon, authenticated;
+grant execute on function public.admin_delete_model_version(uuid,uuid,text,text) to service_role;
+
+do $$ begin
+  if exists(select 1 from pg_roles where rolname='admin_runtime') then
+    grant execute on function public.admin_delete_model_version(uuid,uuid,text,text) to admin_runtime;
+  end if;
+end $$;
+
+commit;
diff --git a/frontend/tests/admin-auth.test.ts b/frontend/tests/admin-auth.test.ts
index d4d8a202..a5df8fe4 100644
--- a/frontend/tests/admin-auth.test.ts
+++ b/frontend/tests/admin-auth.test.ts
@@ -200,6 +200,18 @@ test("adminErrorResponse maps product catalog failures without exposing details"
   }
 });
 
+test("adminErrorResponse maps model draft and delete failures without the generic constraint message", async () => {
+  for (const [error, status, message] of [
+    [{ code: "22023", message: "model_version_not_found" }, 404, "模型版本不存在"],
+    [{ code: "22023", message: "model_draft_not_found" }, 400, "只能修改草稿。已发布模型保存后会生成新版本，不会直接改当前版本"],
+    [{ code: "23514", message: "model_default_required" }, 409, "请先把另一个已发布模型设为默认，再删除这个模型"],
+  ] as const) {
+    const response = adminErrorResponse(error);
+    assert.equal(response.status, status);
+    assert.deepEqual(await response.json(), { error: message });
+  }
+});
+
 test("adminErrorResponse preserves the sanitized authorization 503", async () => {
   const response = adminErrorResponse(
     new AdminAuthorizationError("后台服务暂时不可用", 503),
diff --git a/frontend/tests/admin-model-management-ui-contract.test.ts b/frontend/tests/admin-model-management-ui-contract.test.ts
index cd26ce17..50c37e89 100644
--- a/frontend/tests/admin-model-management-ui-contract.test.ts
+++ b/frontend/tests/admin-model-management-ui-contract.test.ts
@@ -33,9 +33,17 @@ test("model discovery is the only model picker and generates system fields", ()
   assert.match(component, /name="providerModel" label="模型"[\s\S]*<Select[\s\S]*showSearch[\s\S]*optionFilterProp="label"/);
   assert.doesNotMatch(component, /供应商模型名（可手工输入）|name="modelId"|name="label" label="显示名称"/);
   assert.match(component, /import \{ createDiscoveredModelId \} from "\.\/model-id"/);
-  assert.match(component, /const modelId = editingModel\?\.modelId \?\? await createDiscoveredModelId\(values\.providerId, values\.providerModel\)/);
+  // 原值: const modelId = editingModel?.modelId ?? await createDiscoveredModelId(values.providerId, values.providerModel)
+  // 新值: const modelId = editingModel?.modelId ?? await createDiscoveredModelId(values.providerId, providerModel)
+  // 原因: 供应商模型名先 trim，显示名在模型变更时改用新模型名。
+  assert.match(component, /const modelId = editingModel\?\.modelId \?\? await createDiscoveredModelId\(values\.providerId, providerModel\)/);
   assert.doesNotMatch(component, /providerModel\.toLowerCase\(\)\.replace/);
-  assert.match(component, /label: editingModel\?\.label \?\? \(discovered\?\.label\?\.trim\(\) \|\| values\.providerModel\)\.slice\(0, 60\)/);
+  // 原值: label: editingModel?.label ?? (discovered?.label?.trim() || values.providerModel).slice(0, 60)
+  // 新值: 未改供应商模型时保留原显示名；改了则用发现列表里的名称或新模型名
+  // 原因: 编辑时更换 deepseek 模型，显示名必须跟着变，不能一直留着旧名。
+  assert.match(component, /const label = \(!editingModel \|\| editingModel\.providerModel !== providerModel/);
+  assert.match(component, /\? \(discovered\?\.label\?\.trim\(\) \|\| providerModel\)/);
+  assert.match(component, /: editingModel\.label\)\.slice\(0, 60\)/);
 });
 
 test("model form exposes only essential switches and credit cost", () => {
@@ -76,16 +84,38 @@ test("model mutations omit client reasons while the server keeps fixed audit rea
   assert.match(component, /onClick=\{\(\) => void runVersionAction\("rollback", item\)\}>回滚到此版<\/Button>/);
 
   assert.doesNotMatch(route, /reason:\s*z\.string/);
-  for (const reason of ["保存模型供应商", "保存模型草稿", "发布模型版本", "回滚模型版本"]) {
+  for (const reason of ["保存模型供应商", "保存模型草稿", "发布模型版本", "删除模型版本", "回滚模型版本"]) {
     assert.match(route, new RegExp(reason));
   }
+  assert.match(route, /action: z\.literal\("delete"\), versionId: z\.string\(\)\.uuid\(\)/);
   assert.match(route, /reason:\s*modelMutationAuditReasons\[body\.data\.action\]/);
   assert.match(mutationHandler, /admin_save_model_provider[\s\S]*a\.reason/);
   assert.match(mutationHandler, /admin_save_model_draft[\s\S]*a\.reason/);
   assert.match(mutationHandler, /admin_publish_model[\s\S]*a\.reason/);
+  assert.match(mutationHandler, /admin_delete_model_version[\s\S]*a\.reason/);
   assert.match(mutationHandler, /admin_rollback_model[\s\S]*a\.reason/);
 });
 
+test("published model edits fork a draft and every version can be deleted", () => {
+  const migration = readFileSync(
+    new URL("../supabase/migrations/20261020150000_admin_model_version_draft_and_delete.sql", import.meta.url),
+    "utf8",
+  );
+  assert.match(component, /item\.status === "draft" \? "编辑草稿" : "修改"/);
+  assert.match(component, /onClick=\{\(\) => confirmRemove\(item\)\}>删除<\/Button>/);
+  assert.match(component, /保存后会生成新版本草稿，当前已发布版本保持不变/);
+  assert.match(component, /action: "delete", versionId: item\.id/);
+  assert.match(component, /已经绑定这个版本的会话将无法继续提问/);
+  assert.match(migration, /v_existing\.status='draft'/);
+  assert.match(migration, /admin_delete_model_version/);
+  assert.match(migration, /model_default_required/);
+  assert.match(migration, /delete from public\.model_publish_events/);
+  assert.match(
+    readFileSync(new URL("../src/lib/admin/admin-error-response.ts", import.meta.url), "utf8"),
+    /请先把另一个已发布模型设为默认，再删除这个模型/,
+  );
+});
+
 test("provider rows expose a direct add-model entry with the provider preselected", () => {
   assert.match(component, /function openModel\(model\?: ModelVersion, providerId\?: string\)/);
   assert.match(component, /providerId: providerId \?\? providers\[0\]\?\.id/);
diff --git a/frontend/tests/database-billing-admin.test.ts b/frontend/tests/database-billing-admin.test.ts
index 1f050cf2..35b00033 100644
--- a/frontend/tests/database-billing-admin.test.ts
+++ b/frontend/tests/database-billing-admin.test.ts
@@ -513,6 +513,37 @@ test("billing, subscriptions, usage authorization, RBAC, and model publication r
     );
     assert.equal(sql(`select count(*) from public.model_config_versions where status='published' and enabled and is_default`), "1");
     assert.equal(sql(`select count(*) from public.model_publish_events where action='rollback'`), "1");
+
+    const forked = sql(`select public.admin_save_model_draft('${ids.model}','standard-model','${standardV3}','${provider}','Forked label','', 'standard-v3-fork','standard',1,64000,12,22,true,false,'premium-model','{}','保存已发布模型为草稿','standard-fork-1')`);
+    assert.notEqual(forked, standardV3);
+    assert.equal(sql(`select status||':'||label from public.model_config_versions where id='${standardV3}'`), "published:Standard 3");
+    assert.equal(sql(`select status||':'||label from public.model_config_versions where id='${forked}'`), "draft:Forked label");
+    const forkedAgain = sql(`select public.admin_save_model_draft('${ids.model}','standard-model','${standardV3}','${provider}','Forked again','', 'standard-v3-fork-2','standard',1,64000,13,23,true,false,'premium-model','{}','再次保存已发布模型','standard-fork-2')`);
+    assert.equal(forkedAgain, forked);
+    assert.equal(sql(`select count(*) from public.model_config_versions where config_id=(select id from public.model_configs where model_id='standard-model') and status='draft'`), "1");
+    sql(`select public.admin_delete_model_version('${ids.model}','${forked}','删除草稿','model-delete-draft')`);
+    assert.equal(sql(`select count(*) from public.model_config_versions where id='${forked}'`), "0");
+    assert.equal(sql(`select status from public.model_config_versions where id='${standardV3}'`), "published");
+    expectSqlError(
+      `select public.admin_delete_model_version('${ids.support}','${standardV3}','无权删除','model-delete-denied')`,
+      /admin_permission_denied/,
+    );
+    expectSqlError(
+      `select public.admin_delete_model_version('${ids.model}','${standardV3}','默认模型仍被使用','model-delete-default')`,
+      /model_default_required/,
+    );
+    sql(`select public.admin_delete_model_version('${ids.model}','${premiumDraft}','删除已发布非默认模型','model-delete-published')`);
+    assert.equal(sql(`select count(*) from public.model_config_versions where id='${premiumDraft}'`), "0");
+    assert.equal(sql(`select status from public.model_config_versions where id='${premiumV2}'`), "draft");
+    assert.equal(sql(`select count(*) from public.model_publish_events where to_version_id='${premiumDraft}' or from_version_id='${premiumDraft}'`), "0");
+    assert.equal(sql(`select fallback_model_id is null from public.model_config_versions where id='${standardV3}'`), "t");
+    assert.equal(sql(`select after_value ? 'modelId' from audit.admin_audit_logs where action='models.version.delete' and request_id='model-delete-published'`), "t");
+    assert.equal(sql(`select after_value ? 'code' or after_value ? 'token' or after_value ? 'secret' or after_value ? 'key' from audit.admin_audit_logs where action='models.version.delete' and request_id='model-delete-published'`), "f");
+    sql(`select public.admin_delete_model_version('${ids.model}','${premiumV2}','删除剩余草稿','model-delete-premium-draft')`);
+    assert.equal(sql(`select count(*) from public.model_configs where model_id='premium-model'`), "0");
+    assert.equal(sql("select has_function_privilege('admin_runtime','public.admin_delete_model_version(uuid,uuid,text,text)','execute')"), "t");
+    sql(`select public.admin_delete_model_version('${ids.model}','${standardV3}','删除唯一已发布默认模型','model-delete-last-default')`);
+    assert.equal(sql(`select count(*) from public.model_config_versions where id='${standardV3}'`), "0");
   } finally {
     fixture.stop();
   }