1.2.0

Enhance dialog components by adding smooth scroll to top functionality upon opening; update ConfirmDialog, ClearSubmissionsDialog, and DuplicateChainDialog for improved user experience. Remove unused ConfirmDialog from ChainsListPage and TasksListPage, streamlining code.
Refactor ClearSubmissionsDialog and DuplicateChainDialog components by removing unnecessary whitespace; improve code cleanliness and maintainability.
2025-12-14 14:47:50 +03:00 · 2025-12-14 14:46:28 +03:00 · 2025-12-14 13:00:57 +03:00 · 2025-12-13 21:32:22 +03:00 · 2025-12-13 20:32:23 +03:00 · 2025-12-13 20:16:40 +03:00
26 changed files with 2472 additions and 486 deletions
--- a/CLAUDE.MD
+++ b/CLAUDE.MD
@@ -0,0 +1,116 @@
+## Overview
+
+This document summarizes the recent changes around submissions/users pages and records guardrails to avoid similar issues in the future.
+
+We:
+- Reworked submissions and user stats UIs to use real routes/pages instead of modals.
+- Added compact progress overview for participants.
+- Introduced deep-linked details pages for submissions and users.
+- Fixed Chakra UI dialog misuse and type/translation issues.
+
+## Routing & Page Structure
+
+### Do
+- **Define all routes centrally** in `src/__data__/urls.ts` and `src/dashboard.ts`:
+  - Add both the **URL builder** (e.g. `submissionDetails(userId, submissionId)`) and the **`:param` path**.
+  - Wrap pages in `PageWrapper` in `dashboard.tsx`.
+- **Use real pages for complex views** (details, stats) instead of large modals:
+  - Submissions details: `SubmissionDetailsPage` with URL `/submissions/:userId/:submissionId`.
+  - User stats: `UserStatsPage` with URL `/users/:userId`.
+- **Pass IDs via URL**, not only component state:
+  - Use route params for `userId`, `submissionId`, etc.
+  - For “return and keep selection”, encode it as a query param (e.g. `?userId=...`) and read it on the list page.
+
+### Don’t
+- **Don’t hardcode paths in components** (e.g. `'/submissions/...'`); always use `URLs.*` helpers.
+- **Don’t rely solely on local React state for deep links**:
+  - If a view must be shareable/bookmarkable or restorable on reload, it must be addressable by URL.
+
+## Chakra UI Dialogs & Layout
+
+### Do
+- **Use dialog subcomponents only inside a dialog root**:
+  - If you use `DialogBody`, `DialogContent`, etc., they must be wrapped in `<DialogRoot>`.
+- For **standalone pages**, use plain layout components:
+  - `Box`, `Heading`, `VStack`, `Grid`, `Progress`, etc.
+  - No `Dialog*` components on normal routed pages.
+
+### Don’t
+- **Don’t import or use `DialogBody`, `DialogContent`, `DialogHeader`, etc. on regular pages**:
+  - This causes `useDialogStyles returned 'undefined'` runtime errors.
+- **Don’t mix modal patterns and page patterns**:
+  - Either a true modal (`DialogRoot` + `DialogContent`) over an existing page,
+  - Or a full page route with normal layout — not both at the same time.
+
+## Data Safety & Types
+
+### Do
+- Assume backend fields can be **either object or ID string**, per `ChallengeSubmission` types:
+  - Example safe access in submissions:
+    - Guard before reading `user.nickname` or `task.title`.
+  - Derive strings like:
+    - `const nickname = typeof rawUser === 'object' && 'nickname' in rawUser ? rawUser.nickname ?? '' : typeof rawUser === 'string' ? rawUser : ''`.
+- Normalize strings before calling `.toLowerCase()`:
+  - `const normalized = (value ?? '').toLowerCase()`.
+- When filtering/searching, **never call string methods on possibly `undefined` or non-object values**.
+
+### Don’t
+- **Don’t cast blindly** (`as ChallengeUser`) and then access `.nickname` or `.title` without guards.
+- **Don’t call `.toLowerCase()` directly on untrusted values** from API or union-typed fields.
+
+## “Back” Navigation & State Restoration
+
+### Do
+- For **details pages that should restore list state**:
+  - Encode the necessary selection into the URL when navigating _to_ details.
+  - Example: `SubmissionDetailsPage` returns to `URLs.submissions` with `?userId=...`, and `SubmissionsPage` reads `userId` from `useSearchParams` to preselect the user.
+- Prefer **semantic back actions** over bare `navigate(-1)` when the previous page/state is known:
+  - Use `navigate(URLs.submissions + '?userId=...')` or `navigate(URLs.users)` when appropriate.
+
+### Don’t
+- **Don’t rely on `navigate(-1)`** when:
+  - The previous page might not be the canonical list page,
+  - You need a specific state (e.g. selected user) restored.
+
+## i18n / Locales
+
+### Do
+- **Keep `ru.json` and `en.json` in sync** for any new keys:
+  - When adding a key under `challenge.admin.*` in one file, add the corresponding entry in the other.
+- For **status enums**, ensure all possible values have translations:
+  - `challenge.admin.users.stats.status.*` must cover all values of `taskStat.status`.
+  - `challenge.admin.submissions.status.*` must cover all submission statuses.
+- Use **consistent key naming patterns**:
+  - Example: `challenge.admin.users.stats.status.accepted`, `...status.needs_revision`, etc.
+
+### Don’t
+- **Don’t introduce new `t('...')` keys in code without adding them to both locale files**.
+- **Don’t reuse unrelated keys** just to avoid adding translations — create clear, specific keys.
+
+## UI Patterns for High-Density Overviews
+
+### Do
+- For high-density screens (e.g. 100 participants at once):
+  - Use **compact cards or rows** with:
+    - Truncated names (`truncate`),
+    - Thin `Progress` bars,
+    - Minimal text (percentage + small counters).
+  - Sort by progress to surface lagging participants.
+
+### Don’t
+- **Don’t use wide tables** when many rows must fit on one screen; prefer grids or narrow rows with fixed-width text columns and flexible progress area.
+
+## When Adding New Features
+
+Before merging:
+- **Check routing**:
+  - New URL added to `URLs`.
+  - Route wired in `dashboard.tsx`.
+- **Check data safety**:
+  - No unchecked property access on union/nullable types.
+- **Check i18n**:
+  - New keys exist in both `ru.json` and `en.json`.
+- **Check Chakra usage**:
+  - No `Dialog*` components outside a proper `<DialogRoot>` _or_ on standalone pages.
+
+
--- a/bro.config.js
+++ b/bro.config.js
@@ -18,11 +18,11 @@ module.exports = {
  /* use https://admin.bro-js.ru/ to create config, navigations and features */
  navigations: {
    'challenge-admin.main': '/challenge-admin',
-    'link.challenge': '/challenge',
+    'link.challenge.main': '/challenge',
  },
  features: {
    'challenge-admin': {
-      // add your features here in the format [featureName]: { value: string }
+      'use-chain-submissions-api': { value: 'true' },
    },
  },
  config: {
--- a/docs/API_CHAIN_SUBMISSIONS.md
+++ b/docs/API_CHAIN_SUBMISSIONS.md
@@ -0,0 +1,236 @@
+# Техническое задание: Эндпоинт получения попыток по цепочке
+
+## Цель
+
+Создать новый API эндпоинт для получения списка попыток (submissions) участников в рамках конкретной цепочки заданий. Это упростит работу админ-панели и уменьшит объём передаваемых данных.
+
+## Текущая проблема
+
+Сейчас для отображения попыток по цепочке фронтенд должен:
+1. Загрузить список цепочек (`GET /challenge/chains/admin`)
+2. Загрузить общую статистику (`GET /challenge/stats/v2`)
+3. Для каждого участника отдельно загрузить его submissions (`GET /challenge/user/:userId/submissions`)
+4. На клиенте фильтровать submissions по taskIds из выбранной цепочки
+
+Это создаёт избыточные запросы и усложняет логику на фронтенде.
+
+---
+
+## Новый эндпоинт
+
+### `GET /challenge/chain/:chainId/submissions`
+
+Возвращает все попытки всех участников для заданий из указанной цепочки.
+
+### Параметры URL
+
+| Параметр | Тип | Обязательный | Описание |
+|----------|-----|--------------|----------|
+| `chainId` | string | Да | ID цепочки заданий |
+
+### Query параметры (опциональные)
+
+| Параметр | Тип | По умолчанию | Описание |
+|----------|-----|--------------|----------|
+| `userId` | string | - | Фильтр по конкретному пользователю |
+| `status` | string | - | Фильтр по статусу: `pending`, `in_progress`, `accepted`, `needs_revision` |
+| `limit` | number | 100 | Лимит записей |
+| `offset` | number | 0 | Смещение для пагинации |
+
+### Формат ответа
+
+```typescript
+interface ChainSubmissionsResponse {
+  success: boolean;
+  body: {
+    chain: {
+      id: string;
+      name: string;
+      tasks: Array<{
+        id: string;
+        title: string;
+      }>;
+    };
+    participants: Array<{
+      userId: string;
+      nickname: string;
+      completedTasks: number;
+      totalTasks: number;
+      progressPercent: number;
+    }>;
+    submissions: Array<{
+      id: string;
+      user: {
+        id: string;
+        nickname: string;
+      };
+      task: {
+        id: string;
+        title: string;
+      };
+      status: 'pending' | 'in_progress' | 'accepted' | 'needs_revision';
+      attemptNumber: number;
+      submittedAt: string; // ISO date
+      checkedAt?: string;  // ISO date
+      feedback?: string;
+    }>;
+    pagination: {
+      total: number;
+      limit: number;
+      offset: number;
+    };
+  };
+}
+```
+
+### Пример запроса
+
+```bash
+GET /api/challenge/chain/607f1f77bcf86cd799439021/submissions?status=needs_revision&limit=50
+```
+
+### Пример ответа
+
+```json
+{
+  "success": true,
+  "body": {
+    "chain": {
+      "id": "607f1f77bcf86cd799439021",
+      "name": "Основы JavaScript",
+      "tasks": [
+        { "id": "507f1f77bcf86cd799439011", "title": "Реализовать сортировку массива" },
+        { "id": "507f1f77bcf86cd799439015", "title": "Валидация формы" }
+      ]
+    },
+    "participants": [
+      {
+        "userId": "user_123",
+        "nickname": "alex_dev",
+        "completedTasks": 1,
+        "totalTasks": 2,
+        "progressPercent": 50
+      },
+      {
+        "userId": "user_456",
+        "nickname": "maria_coder",
+        "completedTasks": 2,
+        "totalTasks": 2,
+        "progressPercent": 100
+      }
+    ],
+    "submissions": [
+      {
+        "id": "sub_001",
+        "user": {
+          "id": "user_123",
+          "nickname": "alex_dev"
+        },
+        "task": {
+          "id": "507f1f77bcf86cd799439011",
+          "title": "Реализовать сортировку массива"
+        },
+        "status": "needs_revision",
+        "attemptNumber": 2,
+        "submittedAt": "2024-12-10T14:30:00.000Z",
+        "checkedAt": "2024-12-10T14:30:45.000Z",
+        "feedback": "Алгоритм работает неверно для отрицательных чисел"
+      }
+    ],
+    "pagination": {
+      "total": 15,
+      "limit": 50,
+      "offset": 0
+    }
+  }
+}
+```
+
+---
+
+## Логика на бэкенде
+
+### Алгоритм
+
+1. Получить цепочку по `chainId`
+2. Если цепочка не найдена — вернуть 404
+3. Получить список `taskIds` из цепочки
+4. Найти все submissions где `task._id` входит в `taskIds`
+5. Применить фильтры (`userId`, `status`) если указаны
+6. Вычислить прогресс по каждому участнику:
+   - Найти уникальных пользователей из submissions
+   - Для каждого посчитать `completedTasks` (количество уникальных tasks со статусом `accepted`)
+   - Рассчитать `progressPercent = (completedTasks / totalTasks) * 100`
+7. Применить пагинацию к submissions
+8. Вернуть результат
+
+### Индексы MongoDB (рекомендуется)
+
+```javascript
+// Для быстрой выборки submissions по task
+db.submissions.createIndex({ "task": 1, "submittedAt": -1 })
+
+// Составной индекс для фильтрации
+db.submissions.createIndex({ "task": 1, "status": 1, "submittedAt": -1 })
+```
+
+---
+
+## Права доступа
+
+Эндпоинт должен быть доступен только пользователям с ролями:
+- `challenge-admin`
+- `challenge-teacher`
+
+---
+
+## Коды ошибок
+
+| Код | Описание |
+|-----|----------|
+| 200 | Успешный ответ |
+| 400 | Некорректные параметры запроса |
+| 401 | Не авторизован |
+| 403 | Недостаточно прав |
+| 404 | Цепочка не найдена |
+| 500 | Внутренняя ошибка сервера |
+
+---
+
+## Изменения на фронтенде после реализации
+
+После добавления эндпоинта в `src/__data__/api/api.ts` нужно добавить:
+
+```typescript
+// В endpoints builder
+getChainSubmissions: builder.query<ChainSubmissionsResponse, { 
+  chainId: string; 
+  userId?: string; 
+  status?: SubmissionStatus;
+  limit?: number;
+  offset?: number;
+}>({
+  query: ({ chainId, userId, status, limit, offset }) => ({
+    url: `/challenge/chain/${chainId}/submissions`,
+    params: { userId, status, limit, offset },
+  }),
+  transformResponse: (response: { body: ChainSubmissionsResponse }) => response.body,
+  providesTags: ['Submission'],
+}),
+```
+
+Это позволит упростить `SubmissionsPage.tsx`:
+- Один запрос вместо нескольких
+- Убрать клиентскую фильтрацию по taskIds
+- Получать готовый прогресс участников
+
+---
+
+## Приоритет
+
+**Средний** — текущая реализация работает, но создаёт избыточную нагрузку при большом количестве участников.
+
+## Оценка трудозатрат
+
+~4-6 часов (включая тесты)
+
--- a/docs/updateAPI.md
+++ b/docs/updateAPI.md
@@ -0,0 +1,243 @@
+## Обновление API Challenge Service
+
+Документ для frontend-разработчика. Описывает НОВЫЕ возможности и требования к клиенту.
+
+Содержит два блока изменений:
+- **Управление видимостью цепочек заданий** (поле `isActive` и новый админский эндпоинт).
+- **Тестовая проверка решения задания админом** (флаг `isTest` и опциональные `hiddenInstructions` в `/submit`).
+
+---
+
+## 1. Управление видимостью цепочек заданий
+
+### 1.1. Новое поле в модели цепочки
+
+**Поле `isActive`**
+- **Тип**: `boolean`
+- **По умолчанию**: `true`
+- **Смысл**: определяет, видна ли цепочка обычным пользователям в пользовательском списке.
+
+> В базе: поле уже есть в модели `ChallengeChain`, на фронте его нужно учитывать в админских интерфейсах.
+
+---
+
+### 1.2. Пользовательский список цепочек
+
+#### `GET /api/challenge/chains`
+
+- **Назначение**: список цепочек для студентов/обычных пользователей.
+- **Фильтрация на бэке**: возвращаются **только цепочки с `isActive: true`**.
+- **Доступ**: без специальных ролей.
+
+**Гарантии для фронтенда:**
+- Выключенные / черновые цепочки **никогда** не попадут в этот список.
+- Можно строить каталог цепочек, не фильтруя по `isActive` на клиенте.
+
+Упрощённая структура элемента:
+
+```json
+{
+  "id": "...",
+  "name": "Основы программирования",
+  "tasks": [
+    {
+      "id": "...",
+      "title": "...",
+      "description": "..."
+      // Для не-преподавателей поля hiddenInstructions и creator отсутствуют
+    }
+  ],
+  "isActive": true
+}
+```
+
+**Требования к фронтенду:**
+- Для пользовательских экранов достаточно этого эндпоинта, **дополнительную фильтрацию по активности делать не нужно**.
+
+---
+
+### 1.3. Админский список цепочек
+
+#### `GET /api/challenge/chains/admin`
+
+- **Назначение**: полный список цепочек (и включённых, и выключенных) для админских/преподавательских экранов.
+- **Фильтрации по активности нет** — возвращаются **все** цепочки.
+- **Доступ**: только роли `teacher` или `challenge-author`.
+- Включает все данные по задачам, в т.ч. `hiddenInstructions`, `creator`.
+
+Пример ответа (фрагмент):
+
+```json
+{
+  "error": null,
+  "data": [
+    {
+      "id": "...",
+      "name": "Основы программирования",
+      "tasks": [
+        {
+          "id": "...",
+          "title": "...",
+          "description": "...",
+          "hiddenInstructions": "...",
+          "creator": { "sub": "...", "preferred_username": "teacher1" }
+        }
+      ],
+      "isActive": true,
+      "createdAt": "2023-10-29T12:00:00.000Z",
+      "updatedAt": "2023-10-29T12:00:00.000Z"
+    }
+  ]
+}
+```
+
+**Требования к фронтенду (админский UI):**
+- Использовать этот эндпоинт для экранов управления цепочками.
+- Показывать состояние активности (`isActive`) каждой цепочки (badge, тумблер и т.п.).
+- При ошибке 403 (нет роли `teacher` / `challenge-author`) отображать сообщение об отсутствии доступа и, при необходимости, перенаправлять на пользовательский список.
+
+---
+
+### 1.4. Создание и обновление цепочек с учётом активности
+
+#### `POST /api/challenge/chain`
+
+**Роли**: `teacher` или `challenge-author`.
+
+**Тело запроса:**
+
+```json
+{
+  "name": "Основы программирования",
+  "taskIds": ["...", "..."],
+  "isActive": true // опционально, по умолчанию true
+}
+```
+
+- Если `isActive` не передан, цепочка создаётся **активной**.
+
+**Требования к фронтенду:**
+- На форме создания цепочки можно:
+  - либо не показывать тумблер активности (все новые будут активными),
+  - либо добавить переключатель «Активна» и передавать `isActive: false` для черновиков.
+
+#### `PUT /api/challenge/chain/:chainId`
+
+**Роли**: `teacher` или `challenge-author`.
+
+**Тело запроса (все поля опциональны):**
+
+```json
+{
+  "name": "Новое имя",      
+  "taskIds": ["..."],       
+  "isActive": false          
+}
+```
+
+- Если `isActive` передан, его значение меняет активность цепочки.
+- Если `isActive` не передан, активность не меняется.
+
+**Сценарии:**
+- Включить цепочку: `PUT /api/challenge/chain/:id` с `{ "isActive": true }`.
+- Выключить цепочку (спрятать из пользовательского списка): `{ "isActive": false }`.
+- Переименовать / поменять задачи без изменения активности: отправлять только `name` / `taskIds` без поля `isActive`.
+
+**Требования к UI:**
+- На экране «управление цепочками» (данные из `/chains/admin`):
+  - показывать `isActive`;
+  - давать возможность включать/выключать цепочку (тумблер → вызов `PUT /chain/:id` с нужным `isActive`).
+
+---
+
+## 2. Тестовая проверка решения задания (без записи прогресса)
+
+Добавлен режим тестовой проверки решения, который позволяет **преподавателю/автору** проверить ответ через LLM **без создания попытки и без постановки в очередь**.
+
+### 2.1. Расширение эндпоинта отправки решения
+
+#### `POST /api/challenge/submit`
+
+К существующему API добавлены новые опциональные поля в теле запроса:
+
+```json
+{
+  "userId": "...",      
+  "taskId": "...",      
+  "result": "...",      
+  "isTest": true,              // НОВОЕ: флаг тестового режима
+  "hiddenInstructions": "..." // НОВОЕ: опциональные инструкции для проверки
+}
+```
+
+### 2.2. Обычный режим (без `isTest`)
+
+- Если `isTest` **не передан** или `false` — поведение **НЕ изменилось**:
+  - проверяется существование пользователя по `userId`;
+  - считается количество попыток;
+  - создаётся `ChallengeSubmission`;
+  - попытка ставится в очередь на проверку через LLM;
+  - в ответе фронтенд получает `queueId` и `submissionId`.
+
+### 2.3. Тестовый режим (`isTest: true`)
+
+- Доступен только для ролей `teacher` / `challenge-author` (проверка через `isTeacher(req, true)`).
+- **Не создаётся** запись `ChallengeSubmission`.
+- **Не используется** очередь проверки.
+- Проверяется только существование задания (`taskId`), пользователь по `userId` в этом режиме **не ищется и не нужен** (но поле всё ещё формально обязательно по схеме).
+- Если переданы `hiddenInstructions`, они используются **вместо** `task.hiddenInstructions` при формировании промпта для LLM.
+- Никакие изменения инструкций, переданные через `hiddenInstructions`, **не сохраняются** в базу — это чисто временная инструкция для одной тестовой проверки.
+
+**Пример запроса (тестовый режим):**
+
+```http
+POST /api/challenge/submit
+Content-Type: application/json
+Authorization: Bearer <keycloak_token_teacher_or_author>
+
+{
+  "userId": "any-or-dummy-id",   
+  "taskId": "507f1f77bcf86cd799439012",
+  "result": "function solve() { ... }",
+  "isTest": true,
+  "hiddenInstructions": "ВРЕМЕННЫЕ инструкции для проверки, не сохраняются"
+}
+```
+
+**Пример ответа (тестовый режим):**
+
+```json
+{
+  "error": null,
+  "data": {
+    "isTest": true,
+    "status": "accepted",          // или "needs_revision"
+    "feedback": "Развёрнутый комментарий от LLM"
+  }
+}
+```
+
+При отсутствии прав (нет роли `teacher` / `challenge-author`) вернётся 403.
+
+### 2.4. Требования к фронтенду
+
+- **Где использовать тестовый режим**:
+  - только в админских/преподавательских интерфейсах (например, экран настройки задания или предпросмотр проверки);
+  - использовать флаг `isTest: true`, когда нужно получить мгновенный ответ от LLM без записи в историю;
+  - при наличии UI-редактора скрытых инструкций использовать `hiddenInstructions` для передачи временного варианта, не сохраняя его.
+- **Где НЕ использовать**:
+  - в пользовательском флоу сдачи заданий студентами — там должен использоваться обычный режим **без** `isTest`.
+- **UI-ожидания**:
+  - показывать администратору статус (`accepted` / `needs_revision`) и `feedback`;
+  - явно обозначить в интерфейсе, что это «тестовая проверка» и она **не попадает в статистику / попытки**, а переданные `hiddenInstructions` не сохраняются.
+
+---
+
+## 3. Краткое резюме
+
+- Для цепочек:
+  - пользовательский список: `GET /api/challenge/chains` → только активные (`isActive: true`);
+  - админский список: `GET /api/challenge/chains/admin` → все цепочки + управление `isActive` через `POST/PUT /chain`.
+- Для отправки решений:
+  - обычный режим без `isTest` — всё как раньше (очередь, попытки, статистика);
+  - тестовый режим с `isTest: true` + опциональные `hiddenInstructions` — только для `teacher/challenge-author`, без записи прогресса, сразу возвращает результат проверки с учётом временных инструкций.
--- a/locales/en.json
+++ b/locales/en.json
@@ -54,6 +54,18 @@
  "challenge.admin.tasks.delete.confirm.title": "Delete task",
  "challenge.admin.tasks.delete.confirm.message": "Are you sure you want to delete task \"{title}\"? This action cannot be undone.",
  "challenge.admin.tasks.delete.confirm.button": "Delete",
+  "challenge.admin.tasks.test.title": "Test check of answer",
+  "challenge.admin.tasks.test.description": "Send a sample answer to see how the LLM will evaluate this task with hidden instructions applied. This check does not affect statistics or attempt history.",
+  "challenge.admin.tasks.test.field.answer": "Answer for test check",
+  "challenge.admin.tasks.test.field.answer.placeholder": "Enter a sample solution as a student would write it...",
+  "challenge.admin.tasks.test.field.answer.helper": "The answer is sent in test mode (isTest: true) — no submission is created and no queue job is scheduled.",
+  "challenge.admin.tasks.test.button.run": "Run test check",
+  "challenge.admin.tasks.test.success": "Test check completed",
+  "challenge.admin.tasks.test.error": "Failed to run test check",
+  "challenge.admin.tasks.test.forbidden": "You don't have permissions for test checking. Teacher or challenge-author role is required.",
+  "challenge.admin.tasks.test.validation.fill.answer": "Enter an answer text for test check",
+  "challenge.admin.tasks.test.status.accepted": "✅ Answer accepted",
+  "challenge.admin.tasks.test.status.needs_revision": "⚠️ Answer needs revision",
  "challenge.admin.chains.updated": "Chain updated",
  "challenge.admin.chains.created": "Chain created",
  "challenge.admin.chains.validation.enter.name": "Enter chain name",
@@ -74,6 +86,8 @@
  "challenge.admin.chains.button.add": "+ Add",
  "challenge.admin.chains.button.save": "Save changes",
  "challenge.admin.chains.button.create": "Create chain",
+  "challenge.admin.chains.field.isActive": "Active for students",
+  "challenge.admin.chains.field.isActive.helper": "If disabled, the chain will not appear in the user-facing list.",
  "challenge.admin.chains.list.title": "Task Chains",
  "challenge.admin.chains.list.create.button": "+ Create Chain",
  "challenge.admin.chains.list.search.placeholder": "Search by name...",
@@ -84,8 +98,11 @@
  "challenge.admin.chains.list.table.name": "Name",
  "challenge.admin.chains.list.table.tasks.count": "Number of tasks",
  "challenge.admin.chains.list.table.created": "Created date",
+  "challenge.admin.chains.list.table.status": "Status",
  "challenge.admin.chains.list.table.actions": "Actions",
  "challenge.admin.chains.list.badge.tasks": "tasks",
+  "challenge.admin.chains.list.status.active": "Active",
+  "challenge.admin.chains.list.status.inactive": "Inactive",
  "challenge.admin.chains.list.button.edit": "Edit",
  "challenge.admin.chains.list.button.delete": "Delete",
  "challenge.admin.chains.deleted": "Chain deleted",
@@ -95,6 +112,21 @@
  "challenge.admin.chains.delete.confirm.title": "Delete chain",
  "challenge.admin.chains.delete.confirm.message": "Are you sure you want to delete chain \"{name}\"? This action cannot be undone.",
  "challenge.admin.chains.delete.confirm.button": "Delete",
+  "challenge.admin.chains.duplicate.button": "Duplicate",
+  "challenge.admin.chains.duplicate.dialog.title": "Duplicate chain",
+  "challenge.admin.chains.duplicate.dialog.description": "Create a copy of chain \"{name}\" with the same tasks. The new chain will be created as inactive.",
+  "challenge.admin.chains.duplicate.dialog.field.name": "New chain name",
+  "challenge.admin.chains.duplicate.dialog.field.name.placeholder": "Copy - {name}",
+  "challenge.admin.chains.duplicate.dialog.field.name.helper": "Leave empty for auto-generated name",
+  "challenge.admin.chains.duplicate.dialog.button.confirm": "Create copy",
+  "challenge.admin.chains.duplicate.success": "Chain successfully duplicated",
+  "challenge.admin.chains.duplicate.error": "Failed to duplicate chain",
+  "challenge.admin.chains.clear.submissions.button": "Clear submissions",
+  "challenge.admin.chains.clear.submissions.dialog.title": "Clear chain submissions",
+  "challenge.admin.chains.clear.submissions.dialog.message": "Are you sure you want to delete all submissions for chain \"{name}\"? This action is irreversible. All deleted submissions cannot be restored.",
+  "challenge.admin.chains.clear.submissions.dialog.button.confirm": "Delete all submissions",
+  "challenge.admin.chains.clear.submissions.success": "Submissions successfully deleted",
+  "challenge.admin.chains.clear.submissions.error": "Failed to delete submissions",
  "challenge.admin.dashboard.title": "Dashboard",
  "challenge.admin.dashboard.loading": "Loading statistics...",
  "challenge.admin.dashboard.load.error": "Failed to load system statistics",
@@ -137,16 +169,33 @@
  "challenge.admin.users.stats.chains.progress": "Chain progress",
  "challenge.admin.users.stats.tasks": "Tasks",
  "challenge.admin.users.stats.status.completed": "Completed",
+  "challenge.admin.users.stats.status.accepted": "Accepted",
  "challenge.admin.users.stats.status.needs_revision": "Revision",
  "challenge.admin.users.stats.status.in_progress": "In progress",
+  "challenge.admin.users.stats.status.pending": "Pending",
  "challenge.admin.users.stats.status.not_started": "Not started",
+  "challenge.admin.users.stats.status.not_attempted": "Not attempted",
  "challenge.admin.users.stats.attempts": "Attempts:",
  "challenge.admin.users.stats.avg.check.time": "Average check time",
  "challenge.admin.users.stats.close": "Close",
  "challenge.admin.submissions.title": "Solution attempts",
  "challenge.admin.submissions.loading": "Loading attempts...",
  "challenge.admin.submissions.load.error": "Failed to load attempts list",
+  "challenge.admin.submissions.select.chain": "Select a chain to view participant attempts",
+  "challenge.admin.submissions.chain.tasks": "tasks",
+  "challenge.admin.submissions.chain.click": "Click to view attempts",
+  "challenge.admin.submissions.no.chains.title": "No chains",
+  "challenge.admin.submissions.no.chains.description": "Create a task chain to get started",
+  "challenge.admin.submissions.back.to.chains": "Back to chain selection",
+  "challenge.admin.submissions.chain.description": "Total tasks in chain: {{count}}",
+  "challenge.admin.submissions.participants.title": "Chain participants",
+  "challenge.admin.submissions.participants.description": "Select a participant to view their attempts in this chain",
+  "challenge.admin.submissions.participants.empty.title": "No participants",
+  "challenge.admin.submissions.participants.empty.description": "No one has submitted solutions in this chain yet",
+  "challenge.admin.submissions.participants.click.to.view": "→ view",
  "challenge.admin.submissions.search.placeholder": "Search by user or task...",
+  "challenge.admin.submissions.filter.user": "Select user",
+  "challenge.admin.submissions.filter.user.clear": "← All participants",
  "challenge.admin.submissions.filter.status": "Status",
  "challenge.admin.submissions.status.all": "All statuses",
  "challenge.admin.submissions.status.accepted": "Accepted",
@@ -176,6 +225,12 @@
  "challenge.admin.submissions.details.solution": "User solution:",
  "challenge.admin.submissions.details.feedback": "LLM feedback:",
  "challenge.admin.submissions.details.close": "Close",
+  "challenge.admin.submissions.details.not.found": "Attempt not found",
+  "challenge.admin.submissions.overview.title": "Overall participant progress",
+  "challenge.admin.submissions.overview.description": "Below is an overview of all participants and chains. Select a user above to see their individual attempts.",
+  "challenge.admin.submissions.overview.table.user": "Participant",
+  "challenge.admin.submissions.overview.table.chain": "Chain",
+  "challenge.admin.submissions.overview.table.progress": "Progress",
  "challenge.admin.layout.title": "Challenge Admin",
  "challenge.admin.layout.nav.dashboard": "Dashboard",
  "challenge.admin.layout.nav.detailed.stats": "Detailed Statistics",
--- a/locales/ru.json
+++ b/locales/ru.json
@@ -53,6 +53,18 @@
  "challenge.admin.tasks.delete.confirm.title": "Удалить задание",
  "challenge.admin.tasks.delete.confirm.message": "Вы уверены, что хотите удалить задание \"{title}\"? Это действие нельзя отменить.",
  "challenge.admin.tasks.delete.confirm.button": "Удалить",
+  "challenge.admin.tasks.test.title": "Тестовая проверка ответа",
+  "challenge.admin.tasks.test.description": "Отправьте пример ответа, чтобы проверить, как LLM будет оценивать это задание с учётом скрытых инструкций. Эта проверка не попадает в статистику и историю попыток.",
+  "challenge.admin.tasks.test.field.answer": "Ответ для тестовой проверки",
+  "challenge.admin.tasks.test.field.answer.placeholder": "Введите пример решения так, как его написал бы студент...",
+  "challenge.admin.tasks.test.field.answer.helper": "Ответ отправляется в режиме тестовой проверки (isTest: true) — без создания попытки и постановки в очередь.",
+  "challenge.admin.tasks.test.button.run": "Проверить ответ",
+  "challenge.admin.tasks.test.success": "Тестовая проверка выполнена",
+  "challenge.admin.tasks.test.error": "Не удалось выполнить тестовую проверку",
+  "challenge.admin.tasks.test.forbidden": "Недостаточно прав для тестовой проверки. Нужна роль преподавателя или автора челленджа.",
+  "challenge.admin.tasks.test.validation.fill.answer": "Введите текст ответа для тестовой проверки",
+  "challenge.admin.tasks.test.status.accepted": "✅ Ответ принят (accepted)",
+  "challenge.admin.tasks.test.status.needs_revision": "⚠️ Ответ требует доработки (needs_revision)",
  "challenge.admin.chains.updated": "Цепочка обновлена",
  "challenge.admin.chains.created": "Цепочка создана",
  "challenge.admin.chains.validation.enter.name": "Введите название цепочки",
@@ -73,6 +85,8 @@
  "challenge.admin.chains.button.add": "+ Добавить",
  "challenge.admin.chains.button.save": "Сохранить изменения",
  "challenge.admin.chains.button.create": "Создать цепочку",
+  "challenge.admin.chains.field.isActive": "Активна для студентов",
+  "challenge.admin.chains.field.isActive.helper": "Если выключить, цепочка не будет отображаться в пользовательском списке.",
  "challenge.admin.chains.list.title": "Цепочки заданий",
  "challenge.admin.chains.list.create.button": "+ Создать цепочку",
  "challenge.admin.chains.list.search.placeholder": "Поиск по названию...",
@@ -83,8 +97,11 @@
  "challenge.admin.chains.list.table.name": "Название",
  "challenge.admin.chains.list.table.tasks.count": "Количество заданий",
  "challenge.admin.chains.list.table.created": "Дата создания",
+  "challenge.admin.chains.list.table.status": "Статус",
  "challenge.admin.chains.list.table.actions": "Действия",
  "challenge.admin.chains.list.badge.tasks": "заданий",
+  "challenge.admin.chains.list.status.active": "Включена",
+  "challenge.admin.chains.list.status.inactive": "Выключена",
  "challenge.admin.chains.list.button.edit": "Редактировать",
  "challenge.admin.chains.list.button.delete": "Удалить",
  "challenge.admin.chains.deleted": "Цепочка удалена",
@@ -94,6 +111,21 @@
  "challenge.admin.chains.delete.confirm.title": "Удалить цепочку",
  "challenge.admin.chains.delete.confirm.message": "Вы уверены, что хотите удалить цепочку \"{name}\"? Это действие нельзя отменить.",
  "challenge.admin.chains.delete.confirm.button": "Удалить",
+  "challenge.admin.chains.duplicate.button": "Дублировать",
+  "challenge.admin.chains.duplicate.dialog.title": "Дублировать цепочку",
+  "challenge.admin.chains.duplicate.dialog.description": "Создать копию цепочки \"{name}\" с теми же заданиями. Новая цепочка будет создана неактивной.",
+  "challenge.admin.chains.duplicate.dialog.field.name": "Название новой цепочки",
+  "challenge.admin.chains.duplicate.dialog.field.name.placeholder": "Копия - {name}",
+  "challenge.admin.chains.duplicate.dialog.field.name.helper": "Оставьте пустым для автоматического названия",
+  "challenge.admin.chains.duplicate.dialog.button.confirm": "Создать копию",
+  "challenge.admin.chains.duplicate.success": "Цепочка успешно скопирована",
+  "challenge.admin.chains.duplicate.error": "Не удалось скопировать цепочку",
+  "challenge.admin.chains.clear.submissions.button": "Очистить попытки",
+  "challenge.admin.chains.clear.submissions.dialog.title": "Очистить попытки по цепочке",
+  "challenge.admin.chains.clear.submissions.dialog.message": "Вы уверены, что хотите удалить все попытки по цепочке \"{name}\"? Это действие необратимо. Все удаленные попытки невозможно восстановить.",
+  "challenge.admin.chains.clear.submissions.dialog.button.confirm": "Удалить все попытки",
+  "challenge.admin.chains.clear.submissions.success": "Попытки успешно удалены",
+  "challenge.admin.chains.clear.submissions.error": "Не удалось удалить попытки",
  "challenge.admin.dashboard.title": "Dashboard",
  "challenge.admin.dashboard.loading": "Загрузка статистики...",
  "challenge.admin.dashboard.load.error": "Не удалось загрузить статистику системы",
@@ -136,16 +168,33 @@
  "challenge.admin.users.stats.chains.progress": "Прогресс по цепочкам",
  "challenge.admin.users.stats.tasks": "Задания",
  "challenge.admin.users.stats.status.completed": "Завершено",
+  "challenge.admin.users.stats.status.accepted": "Принято",
  "challenge.admin.users.stats.status.needs_revision": "Доработка",
  "challenge.admin.users.stats.status.in_progress": "В процессе",
+  "challenge.admin.users.stats.status.pending": "Ожидает",
  "challenge.admin.users.stats.status.not_started": "Не начато",
+  "challenge.admin.users.stats.status.not_attempted": "Не пытался",
  "challenge.admin.users.stats.attempts": "Попыток:",
  "challenge.admin.users.stats.avg.check.time": "Среднее время проверки",
  "challenge.admin.users.stats.close": "Закрыть",
  "challenge.admin.submissions.title": "Попытки решений",
  "challenge.admin.submissions.loading": "Загрузка попыток...",
  "challenge.admin.submissions.load.error": "Не удалось загрузить список попыток",
+  "challenge.admin.submissions.select.chain": "Выберите цепочку для просмотра попыток участников",
+  "challenge.admin.submissions.chain.tasks": "заданий",
+  "challenge.admin.submissions.chain.click": "Нажмите для просмотра попыток",
+  "challenge.admin.submissions.no.chains.title": "Нет цепочек",
+  "challenge.admin.submissions.no.chains.description": "Создайте цепочку заданий для начала работы",
+  "challenge.admin.submissions.back.to.chains": "Назад к выбору цепочки",
+  "challenge.admin.submissions.chain.description": "Всего заданий в цепочке: {{count}}",
+  "challenge.admin.submissions.participants.title": "Участники цепочки",
+  "challenge.admin.submissions.participants.description": "Выберите участника для просмотра его попыток в этой цепочке",
+  "challenge.admin.submissions.participants.empty.title": "Нет участников",
+  "challenge.admin.submissions.participants.empty.description": "Пока никто не отправил решения в этой цепочке",
+  "challenge.admin.submissions.participants.click.to.view": "→ посмотреть",
  "challenge.admin.submissions.search.placeholder": "Поиск по пользователю или заданию...",
+  "challenge.admin.submissions.filter.user": "Выберите пользователя",
+  "challenge.admin.submissions.filter.user.clear": "← Все участники",
  "challenge.admin.submissions.filter.status": "Статус",
  "challenge.admin.submissions.status.all": "Все статусы",
  "challenge.admin.submissions.status.accepted": "Принято",
@@ -175,6 +224,12 @@
  "challenge.admin.submissions.details.solution": "Решение пользователя:",
  "challenge.admin.submissions.details.feedback": "Обратная связь от LLM:",
  "challenge.admin.submissions.details.close": "Закрыть",
+  "challenge.admin.submissions.details.not.found": "Попытка не найдена",
+  "challenge.admin.submissions.overview.title": "Общий прогресс по участникам",
+  "challenge.admin.submissions.overview.description": "Ниже — сводка по прогрессу всех участников и цепочек. Выберите пользователя выше, чтобы просмотреть его отдельные попытки.",
+  "challenge.admin.submissions.overview.table.user": "Участник",
+  "challenge.admin.submissions.overview.table.chain": "Цепочка",
+  "challenge.admin.submissions.overview.table.progress": "Прогресс",
  "challenge.admin.layout.title": "Challenge Admin",
  "challenge.admin.layout.nav.dashboard": "Dashboard",
  "challenge.admin.layout.nav.detailed.stats": "Детальная статистика",
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
  "name": "challenge-admin-pl",
-  "version": "1.0.0",
+  "version": "1.2.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "challenge-admin-pl",
-      "version": "1.0.0",
+      "version": "1.2.0",
      "license": "ISC",
      "dependencies": {
        "@brojs/cli": "^1.9.4",
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "challenge-admin",
-  "version": "1.0.0",
+  "version": "1.2.0",
  "description": "",
  "main": "./src/index.tsx",
  "scripts": {
--- a/src/data/api/api.ts
+++ b/src/data/api/api.ts
@@ -13,6 +13,12 @@ import type {
  UpdateTaskRequest,
  CreateChainRequest,
  UpdateChainRequest,
+  DuplicateChainRequest,
+  ClearSubmissionsResponse,
+  SubmitRequest,
+  TestSubmissionResult,
+  ChainSubmissionsResponse,
+  SubmissionStatus,
 } from '../../types/challenge'

 export const api = createApi({
@@ -77,7 +83,7 @@ export const api = createApi({

    // Chains
    getChains: builder.query<ChallengeChain[], void>({
-      query: () => '/challenge/chains',
+      query: () => '/challenge/chains/admin',
      transformResponse: (response: { body: ChallengeChain[] }) => response.body,
      providesTags: ['Chain'],
    }),
@@ -111,6 +117,23 @@ export const api = createApi({
      }),
      invalidatesTags: ['Chain'],
    }),
+    duplicateChain: builder.mutation<ChallengeChain, { chainId: string; name?: string }>({
+      query: ({ chainId, name }) => ({
+        url: `/challenge/chain/${chainId}/duplicate`,
+        method: 'POST',
+        body: name ? { name } : {},
+      }),
+      transformResponse: (response: { body: ChallengeChain }) => response.body,
+      invalidatesTags: ['Chain'],
+    }),
+    clearChainSubmissions: builder.mutation<ClearSubmissionsResponse, string>({
+      query: (chainId) => ({
+        url: `/challenge/chain/${chainId}/submissions`,
+        method: 'DELETE',
+      }),
+      transformResponse: (response: { body: ClearSubmissionsResponse }) => response.body,
+      invalidatesTags: ['Chain', 'Submission'],
+    }),

    // Statistics
    getSystemStats: builder.query<SystemStats, void>({
@@ -141,6 +164,34 @@ export const api = createApi({
      transformResponse: (response: { body: ChallengeSubmission[] }) => response.body,
      providesTags: ['Submission'],
    }),
+    getChainSubmissions: builder.query<
+      ChainSubmissionsResponse,
+      { chainId: string; userId?: string; status?: SubmissionStatus }
+    >({
+      query: ({ chainId, userId, status }) => ({
+        url: `/challenge/chain/${chainId}/submissions`,
+        params: userId || status ? { userId, status } : undefined,
+      }),
+      transformResponse: (response: { body: ChainSubmissionsResponse }) => response.body,
+      providesTags: ['Submission'],
+    }),
+
+    // Test submission (LLM check without creating a real submission)
+    testSubmission: builder.mutation<TestSubmissionResult, SubmitRequest>({
+      query: ({ userId, taskId, result, isTest = true, hiddenInstructions }) => ({
+        url: '/challenge/submit',
+        method: 'POST',
+        body: {
+          userId,
+          taskId,
+          result,
+          isTest,
+          hiddenInstructions,
+        },
+      }),
+      // Сервер возвращает { success: boolean; body: TestSubmissionResult }
+      transformResponse: (response: { success: boolean; body: TestSubmissionResult }) => response.body,
+    }),
  }),
 })

@@ -155,9 +206,13 @@ export const {
  useCreateChainMutation,
  useUpdateChainMutation,
  useDeleteChainMutation,
+  useDuplicateChainMutation,
+  useClearChainSubmissionsMutation,
  useGetSystemStatsQuery,
  useGetSystemStatsV2Query,
  useGetUserStatsQuery,
  useGetUserSubmissionsQuery,
+  useGetChainSubmissionsQuery,
+  useTestSubmissionMutation,
 } = api

--- a/src/data/urls.ts
+++ b/src/data/urls.ts
@@ -31,11 +31,17 @@ export const URLs = {
  
  // Users
  users: makeUrl('/users'),
+  userStats: (userId: string) => makeUrl(`/users/${userId}`),
+  userStatsPath: makeUrl('/users/:userId'),
  
  // Submissions
  submissions: makeUrl('/submissions'),
+  submissionsChain: (chainId: string) => makeUrl(`/submissions/${chainId}`),
+  submissionsChainPath: makeUrl('/submissions/:chainId'),
+  submissionDetails: (chainId: string, userId: string, submissionId: string) => makeUrl(`/submissions/${chainId}/${userId}/${submissionId}`),
+  submissionDetailsPath: makeUrl('/submissions/:chainId/:userId/:submissionId'),
  
  // External links
-  challengePlayer: navs['link.challenge'] || '/challenge',
+  challengePlayer: navs['link.challenge.main'] || '/challenge',
 }

--- a/src/components/ClearSubmissionsDialog.tsx
+++ b/src/components/ClearSubmissionsDialog.tsx
@@ -0,0 +1,87 @@
+import React, { useEffect } from 'react'
+import { useTranslation } from 'react-i18next'
+import {
+  DialogRoot,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogBody,
+  DialogFooter,
+  DialogActionTrigger,
+  Button,
+  Text,
+} from '@chakra-ui/react'
+import { useClearChainSubmissionsMutation } from '../__data__/api/api'
+import { toaster } from './ui/toaster'
+import type { ChallengeChain } from '../types/challenge'
+
+interface ClearSubmissionsDialogProps {
+  isOpen: boolean
+  onClose: () => void
+  chain: ChallengeChain | null
+}
+
+export const ClearSubmissionsDialog: React.FC<ClearSubmissionsDialogProps> = ({
+  isOpen,
+  onClose,
+  chain,
+}) => {
+  const { t } = useTranslation()
+  const [clearSubmissions, { isLoading }] = useClearChainSubmissionsMutation()
+
+  // Прокручиваем страницу к началу при открытии диалога
+  useEffect(() => {
+    if (isOpen) {
+      window.scrollTo({ top: 0, behavior: 'smooth' })
+    }
+  }, [isOpen])
+
+  const handleConfirm = async () => {
+    if (!chain) return
+
+    try {
+      await clearSubmissions(chain.id).unwrap()
+      toaster.create({
+        title: t('challenge.admin.common.success'),
+        description: t('challenge.admin.chains.clear.submissions.success'),
+        type: 'success',
+      })
+      onClose()
+    } catch (err) {
+      toaster.create({
+        title: t('challenge.admin.common.error'),
+        description: t('challenge.admin.chains.clear.submissions.error'),
+        type: 'error',
+      })
+    }
+  }
+
+  if (!chain) return null
+
+  return (
+    <DialogRoot open={isOpen} onOpenChange={(e) => !e.open && onClose()} scrollBehavior="inside">
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>{t('challenge.admin.chains.clear.submissions.dialog.title')}</DialogTitle>
+        </DialogHeader>
+        <DialogBody>
+          <Text>{t('challenge.admin.chains.clear.submissions.dialog.message', { name: chain.name })}</Text>
+        </DialogBody>
+        <DialogFooter>
+          <DialogActionTrigger asChild>
+            <Button variant="outline" onClick={onClose} disabled={isLoading}>
+              {t('challenge.admin.common.cancel')}
+            </Button>
+          </DialogActionTrigger>
+          <Button colorPalette="red" onClick={handleConfirm} disabled={isLoading}>
+            {t('challenge.admin.chains.clear.submissions.dialog.button.confirm')}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </DialogRoot>
+  )
+}
+
+
+
+
--- a/src/components/ConfirmDialog.tsx
+++ b/src/components/ConfirmDialog.tsx
@@ -1,4 +1,4 @@
-import React from 'react'
+import React, { useEffect } from 'react'
 import { useTranslation } from 'react-i18next'
 import {
  DialogRoot,
@@ -36,8 +36,16 @@ export const ConfirmDialog: React.FC<ConfirmDialogProps> = ({
  
  const confirm = confirmLabel || t('challenge.admin.common.confirm')
  const cancel = cancelLabel || t('challenge.admin.common.cancel')
+
+  // Прокручиваем страницу к началу при открытии диалога
+  useEffect(() => {
+    if (isOpen) {
+      window.scrollTo({ top: 0, behavior: 'smooth' })
+    }
+  }, [isOpen])
+
  return (
-    <DialogRoot open={isOpen} onOpenChange={(e) => !e.open && onClose()}>
+    <DialogRoot open={isOpen} onOpenChange={(e) => !e.open && onClose()} scrollBehavior="inside">
      <DialogContent>
        <DialogHeader>
          <DialogTitle>{title}</DialogTitle>
--- a/src/components/DuplicateChainDialog.tsx
+++ b/src/components/DuplicateChainDialog.tsx
@@ -0,0 +1,116 @@
+import React, { useState, useEffect } from 'react'
+import { useTranslation } from 'react-i18next'
+import {
+  DialogRoot,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogBody,
+  DialogFooter,
+  DialogActionTrigger,
+  Button,
+  Field,
+  Input,
+  Text,
+  VStack,
+} from '@chakra-ui/react'
+import { useDuplicateChainMutation } from '../__data__/api/api'
+import { toaster } from './ui/toaster'
+import type { ChallengeChain } from '../types/challenge'
+
+interface DuplicateChainDialogProps {
+  isOpen: boolean
+  onClose: () => void
+  chain: ChallengeChain | null
+}
+
+export const DuplicateChainDialog: React.FC<DuplicateChainDialogProps> = ({
+  isOpen,
+  onClose,
+  chain,
+}) => {
+  const { t } = useTranslation()
+  const [name, setName] = useState('')
+  const [duplicateChain, { isLoading }] = useDuplicateChainMutation()
+
+  // Прокручиваем страницу к началу при открытии диалога
+  useEffect(() => {
+    if (isOpen) {
+      window.scrollTo({ top: 0, behavior: 'smooth' })
+    }
+  }, [isOpen])
+
+  const handleClose = () => {
+    setName('')
+    onClose()
+  }
+
+  const handleConfirm = async () => {
+    if (!chain) return
+
+    try {
+      await duplicateChain({
+        chainId: chain.id,
+        name: name.trim() || undefined,
+      }).unwrap()
+      toaster.create({
+        title: t('challenge.admin.common.success'),
+        description: t('challenge.admin.chains.duplicate.success'),
+        type: 'success',
+      })
+      handleClose()
+    } catch (err) {
+      toaster.create({
+        title: t('challenge.admin.common.error'),
+        description: t('challenge.admin.chains.duplicate.error'),
+        type: 'error',
+      })
+    }
+  }
+
+  if (!chain) return null
+
+  const defaultPlaceholder = t('challenge.admin.chains.duplicate.dialog.field.name.placeholder', {
+    name: chain.name,
+  })
+
+  return (
+    <DialogRoot open={isOpen} onOpenChange={(e) => !e.open && handleClose()} scrollBehavior="inside">
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>{t('challenge.admin.chains.duplicate.dialog.title')}</DialogTitle>
+        </DialogHeader>
+        <DialogBody>
+          <VStack gap={4} align="stretch">
+            <Text>{t('challenge.admin.chains.duplicate.dialog.description', { name: chain.name })}</Text>
+            <Field.Root>
+              <Field.Label>{t('challenge.admin.chains.duplicate.dialog.field.name')}</Field.Label>
+              <Input
+                value={name}
+                onChange={(e) => setName(e.target.value)}
+                placeholder={defaultPlaceholder}
+              />
+              <Field.HelperText>
+                {t('challenge.admin.chains.duplicate.dialog.field.name.helper')}
+              </Field.HelperText>
+            </Field.Root>
+          </VStack>
+        </DialogBody>
+        <DialogFooter>
+          <DialogActionTrigger asChild>
+            <Button variant="outline" onClick={handleClose} disabled={isLoading}>
+              {t('challenge.admin.common.cancel')}
+            </Button>
+          </DialogActionTrigger>
+          <Button colorPalette="teal" onClick={handleConfirm} disabled={isLoading}>
+            {t('challenge.admin.chains.duplicate.dialog.button.confirm')}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </DialogRoot>
+  )
+}
+
+
+
+
--- a/src/dashboard.tsx
+++ b/src/dashboard.tsx
@@ -9,7 +9,9 @@ import { TaskFormPage } from './pages/tasks/TaskFormPage'
 import { ChainsListPage } from './pages/chains/ChainsListPage'
 import { ChainFormPage } from './pages/chains/ChainFormPage'
 import { UsersPage } from './pages/users/UsersPage'
+import { UserStatsPage } from './pages/users/UserStatsPage'
 import { SubmissionsPage } from './pages/submissions/SubmissionsPage'
+import { SubmissionDetailsPage } from './pages/submissions/SubmissionDetailsPage'
 import { URLs } from './__data__/urls'

 const PageWrapper = ({ children }: React.PropsWithChildren) => (
@@ -110,6 +112,14 @@ export const Dashboard = () => {
          </PageWrapper>
        }
      />
+      <Route
+        path={URLs.userStatsPath}
+        element={
+          <PageWrapper>
+            <UserStatsPage />
+          </PageWrapper>
+        }
+      />

      {/* Submissions */}
      <Route
@@ -120,6 +130,22 @@ export const Dashboard = () => {
          </PageWrapper>
        }
      />
+      <Route
+        path={URLs.submissionsChainPath}
+        element={
+          <PageWrapper>
+            <SubmissionsPage />
+          </PageWrapper>
+        }
+      />
+      <Route
+        path={URLs.submissionDetailsPath}
+        element={
+          <PageWrapper>
+            <SubmissionDetailsPage />
+          </PageWrapper>
+        }
+      />
    </Routes>
  )
 }
--- a/src/pages/chains/ChainFormPage.tsx
+++ b/src/pages/chains/ChainFormPage.tsx
@@ -42,11 +42,13 @@ export const ChainFormPage: React.FC = () => {
  const [name, setName] = useState('')
  const [selectedTasks, setSelectedTasks] = useState<ChallengeTask[]>([])
  const [searchQuery, setSearchQuery] = useState('')
+  const [isActive, setIsActive] = useState(true)

  useEffect(() => {
    if (chain) {
      setName(chain.name)
      setSelectedTasks(chain.tasks)
+      setIsActive(chain.isActive !== false)
    }
  }, [chain])

@@ -80,6 +82,7 @@ export const ChainFormPage: React.FC = () => {
          data: {
            name: name.trim(),
            taskIds: taskIds,
+            isActive,
          },
        }).unwrap()
        toaster.create({
@@ -91,6 +94,7 @@ export const ChainFormPage: React.FC = () => {
        await createChain({
          name: name.trim(),
          taskIds: taskIds,
+          isActive,
        }).unwrap()
        toaster.create({
          title: t('challenge.admin.common.success'),
@@ -191,6 +195,25 @@ export const ChainFormPage: React.FC = () => {
            />
          </Field.Root>

+          {/* Active flag */}
+          <Field.Root>
+            <HStack justify="space-between" align="flex-start">
+              <HStack gap={2}>
+                <input
+                  type="checkbox"
+                  checked={isActive}
+                  onChange={(e) => setIsActive(e.target.checked)}
+                  disabled={isLoading}
+                  style={{ cursor: isLoading ? 'not-allowed' : 'pointer' }}
+                />
+                <Text>{t('challenge.admin.chains.field.isActive')}</Text>
+              </HStack>
+              <Text fontSize="sm" color="gray.500" maxW="md">
+                {t('challenge.admin.chains.field.isActive.helper')}
+              </Text>
+            </HStack>
+          </Field.Root>
+
          {/* Selected Tasks */}
          <Box>
            <Text fontWeight="bold" mb={3}>
@@ -227,6 +250,15 @@ export const ChainFormPage: React.FC = () => {
                      <Text fontWeight="medium">{task.title}</Text>
                    </HStack>
                    <HStack gap={1}>
+                      <IconButton
+                        size="sm"
+                        variant="ghost"
+                        onClick={() => navigate(URLs.taskEdit(task.id))}
+                        disabled={isLoading}
+                        aria-label="Edit task"
+                      >
+                        ✎
+                      </IconButton>
                      <IconButton
                        size="sm"
                        variant="ghost"
--- a/src/pages/chains/ChainsListPage.tsx
+++ b/src/pages/chains/ChainsListPage.tsx
@@ -12,12 +12,13 @@ import {
  Text,
  Badge,
 } from '@chakra-ui/react'
-import { useGetChainsQuery, useDeleteChainMutation } from '../../__data__/api/api'
+import { useGetChainsQuery, useDeleteChainMutation, useUpdateChainMutation } from '../../__data__/api/api'
 import { URLs } from '../../__data__/urls'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { ErrorAlert } from '../../components/ErrorAlert'
 import { EmptyState } from '../../components/EmptyState'
-import { ConfirmDialog } from '../../components/ConfirmDialog'
+import { DuplicateChainDialog } from '../../components/DuplicateChainDialog'
+import { ClearSubmissionsDialog } from '../../components/ClearSubmissionsDialog'
 import type { ChallengeChain } from '../../types/challenge'
 import { toaster } from '../../components/ui/toaster'

@@ -25,22 +26,28 @@ export const ChainsListPage: React.FC = () => {
  const navigate = useNavigate()
  const { t } = useTranslation()
  const { data: chains, isLoading, error, refetch } = useGetChainsQuery()
-  const [deleteChain, { isLoading: isDeleting }] = useDeleteChainMutation()
+  const [deleteChain] = useDeleteChainMutation()

  const [searchQuery, setSearchQuery] = useState('')
-  const [chainToDelete, setChainToDelete] = useState<ChallengeChain | null>(null)
+  const [chainToDuplicate, setChainToDuplicate] = useState<ChallengeChain | null>(null)
+  const [chainToClearSubmissions, setChainToClearSubmissions] = useState<ChallengeChain | null>(null)
+  const [updatingChainId, setUpdatingChainId] = useState<string | null>(null)
+  const [updateChain] = useUpdateChainMutation()

-  const handleDeleteChain = async () => {
-    if (!chainToDelete) return
+  const handleDeleteChain = async (chain: ChallengeChain) => {
+    const confirmed = window.confirm(
+      t('challenge.admin.chains.delete.confirm.message', { name: chain.name })
+    )
+
+    if (!confirmed) return

    try {
-      await deleteChain(chainToDelete.id).unwrap()
+      await deleteChain(chain.id).unwrap()
      toaster.create({
        title: t('challenge.admin.common.success'),
        description: t('challenge.admin.chains.deleted'),
        type: 'success',
      })
-      setChainToDelete(null)
    } catch (err) {
      toaster.create({
        title: t('challenge.admin.common.error'),
@@ -50,6 +57,30 @@ export const ChainsListPage: React.FC = () => {
    }
  }

+  const handleToggleActive = async (chain: ChallengeChain, nextValue: boolean) => {
+    setUpdatingChainId(chain.id)
+
+    try {
+      await updateChain({
+        id: chain.id,
+        data: { isActive: nextValue },
+      }).unwrap()
+      toaster.create({
+        title: t('challenge.admin.common.success'),
+        description: t('challenge.admin.chains.updated'),
+        type: 'success',
+      })
+    } catch {
+      toaster.create({
+        title: t('challenge.admin.common.error'),
+        description: t('challenge.admin.chains.save.error'),
+        type: 'error',
+      })
+    } finally {
+      setUpdatingChainId(null)
+    }
+  }
+
  if (isLoading) {
    return <LoadingSpinner message={t('challenge.admin.chains.list.loading')} />
  }
@@ -110,6 +141,7 @@ export const ChainsListPage: React.FC = () => {
                <Table.ColumnHeader>{t('challenge.admin.chains.list.table.name')}</Table.ColumnHeader>
                <Table.ColumnHeader>{t('challenge.admin.chains.list.table.tasks.count')}</Table.ColumnHeader>
                <Table.ColumnHeader>{t('challenge.admin.chains.list.table.created')}</Table.ColumnHeader>
+                <Table.ColumnHeader>{t('challenge.admin.chains.list.table.status')}</Table.ColumnHeader>
                <Table.ColumnHeader textAlign="right">{t('challenge.admin.chains.list.table.actions')}</Table.ColumnHeader>
              </Table.Row>
            </Table.Header>
@@ -127,6 +159,25 @@ export const ChainsListPage: React.FC = () => {
                      {formatDate(chain.createdAt)}
                    </Text>
                  </Table.Cell>
+                  <Table.Cell>
+                    <HStack gap={3} justify="flex-start">
+                      <Badge colorPalette={chain.isActive ? 'green' : 'gray'} variant="subtle">
+                        {chain.isActive
+                          ? t('challenge.admin.chains.list.status.active')
+                          : t('challenge.admin.chains.list.status.inactive')}
+                      </Badge>
+                      <Button
+                        size="xs"
+                        variant="outline"
+                        onClick={() => handleToggleActive(chain, !chain.isActive)}
+                        disabled={updatingChainId === chain.id}
+                      >
+                        {chain.isActive
+                          ? t('challenge.admin.chains.list.status.inactive')
+                          : t('challenge.admin.chains.list.status.active')}
+                      </Button>
+                    </HStack>
+                  </Table.Cell>
                  <Table.Cell textAlign="right">
                    <HStack gap={2} justify="flex-end">
                      <Button
@@ -136,11 +187,26 @@ export const ChainsListPage: React.FC = () => {
                      >
                        {t('challenge.admin.chains.list.button.edit')}
                      </Button>
+                      <Button
+                        size="sm"
+                        variant="ghost"
+                        onClick={() => setChainToDuplicate(chain)}
+                      >
+                        {t('challenge.admin.chains.duplicate.button')}
+                      </Button>
                      <Button
                        size="sm"
                        variant="ghost"
                        colorPalette="red"
-                        onClick={() => setChainToDelete(chain)}
+                        onClick={() => setChainToClearSubmissions(chain)}
+                      >
+                        {t('challenge.admin.chains.clear.submissions.button')}
+                      </Button>
+                      <Button
+                        size="sm"
+                        variant="ghost"
+                        colorPalette="red"
+                        onClick={() => handleDeleteChain(chain)}
                      >
                        {t('challenge.admin.chains.list.button.delete')}
                      </Button>
@@ -153,14 +219,16 @@ export const ChainsListPage: React.FC = () => {
        </Box>
      )}

-      <ConfirmDialog
-        isOpen={!!chainToDelete}
-        onClose={() => setChainToDelete(null)}
-        onConfirm={handleDeleteChain}
-        title={t('challenge.admin.chains.delete.confirm.title')}
-        message={t('challenge.admin.chains.delete.confirm.message', { name: chainToDelete?.name })}
-        confirmLabel={t('challenge.admin.chains.delete.confirm.button')}
-        isLoading={isDeleting}
+      <DuplicateChainDialog
+        isOpen={!!chainToDuplicate}
+        onClose={() => setChainToDuplicate(null)}
+        chain={chainToDuplicate}
+      />
+
+      <ClearSubmissionsDialog
+        isOpen={!!chainToClearSubmissions}
+        onClose={() => setChainToClearSubmissions(null)}
+        chain={chainToClearSubmissions}
      />
    </Box>
  )
--- a/src/pages/submissions/SubmissionDetailsPage.tsx
+++ b/src/pages/submissions/SubmissionDetailsPage.tsx
@@ -0,0 +1,239 @@
+import React from 'react'
+import { useTranslation } from 'react-i18next'
+import { useParams, useNavigate } from 'react-router-dom'
+import { Box, Heading, Text, Button, HStack, VStack } from '@chakra-ui/react'
+import ReactMarkdown from 'react-markdown'
+import { useGetUserSubmissionsQuery } from '../../__data__/api/api'
+import { LoadingSpinner } from '../../components/LoadingSpinner'
+import { ErrorAlert } from '../../components/ErrorAlert'
+import { StatusBadge } from '../../components/StatusBadge'
+import type { ChallengeTask, ChallengeUser } from '../../types/challenge'
+import { URLs } from '../../__data__/urls'
+
+export const SubmissionDetailsPage: React.FC = () => {
+  const { t } = useTranslation()
+  const { chainId, userId, submissionId } = useParams<{ chainId: string; userId: string; submissionId: string }>()
+  const navigate = useNavigate()
+
+  // Получаем submissions для конкретного пользователя
+  const { data: submissions, isLoading, error } = useGetUserSubmissionsQuery(
+    { userId: userId!, taskId: undefined },
+    { skip: !userId }
+  )
+
+  const submission = submissions?.find((s) => s.id === submissionId)
+
+  const handleBack = () => {
+    if (chainId) {
+      navigate(URLs.submissionsChain(chainId))
+    } else {
+      navigate(URLs.submissions)
+    }
+  }
+
+  if (isLoading) {
+    return <LoadingSpinner message={t('challenge.admin.submissions.loading')} />
+  }
+
+  if (error) {
+    return <ErrorAlert message={t('challenge.admin.submissions.load.error')} onRetry={handleBack} />
+  }
+
+  if (!submission) {
+    return (
+      <Box>
+        <Button variant="ghost" onClick={handleBack} mb={4}>
+          ← {t('challenge.admin.common.close')}
+        </Button>
+        <ErrorAlert
+          message={t('challenge.admin.submissions.details.not.found')}
+          onRetry={handleBack}
+        />
+      </Box>
+    )
+  }
+
+  const rawUser = submission.user as ChallengeUser | string | undefined
+  const rawTask = submission.task as ChallengeTask | string | undefined
+
+  const userNickname =
+    rawUser && typeof rawUser === 'object' && 'nickname' in rawUser
+      ? rawUser.nickname ?? ''
+      : typeof rawUser === 'string'
+        ? rawUser
+        : ''
+
+  const taskTitle =
+    rawTask && typeof rawTask === 'object' && 'title' in rawTask
+      ? rawTask.title ?? ''
+      : typeof rawTask === 'string'
+        ? rawTask
+        : ''
+
+  const taskDescription =
+    rawTask && typeof rawTask === 'object' && 'description' in rawTask
+      ? rawTask.description ?? ''
+      : ''
+
+  const formatDate = (dateStr: string) => {
+    return new Date(dateStr).toLocaleString('ru-RU', {
+      year: 'numeric',
+      month: 'long',
+      day: 'numeric',
+      hour: '2-digit',
+      minute: '2-digit',
+      second: '2-digit',
+    })
+  }
+
+  const getCheckTimeValue = () => {
+    if (!submission.checkedAt) return null
+    const submitted = new Date(submission.submittedAt).getTime()
+    const checked = new Date(submission.checkedAt).getTime()
+    return ((checked - submitted) / 1000).toFixed(2)
+  }
+
+  return (
+    <Box>
+      {/* Header with back button */}
+      <HStack mb={6}>
+        <Button variant="ghost" onClick={handleBack}>
+          ← {t('challenge.admin.common.close')}
+        </Button>
+      </HStack>
+
+      <Heading mb={6}>
+        {t('challenge.admin.submissions.details.title')} #{submission.attemptNumber}
+      </Heading>
+
+      <VStack gap={6} align="stretch">
+        {/* Meta */}
+        <Box
+          p={6}
+          bg="white"
+          borderRadius="lg"
+          boxShadow="sm"
+          borderWidth="1px"
+          borderColor="gray.200"
+        >
+          <HStack mb={4} justify="space-between">
+            <Box>
+              <Text fontSize="sm" color="gray.600" mb={1}>
+                {t('challenge.admin.submissions.details.user')}
+              </Text>
+              <Text fontWeight="bold">{userNickname}</Text>
+            </Box>
+            <Box>
+              <Text fontSize="sm" color="gray.600" mb={1}>
+                {t('challenge.admin.submissions.details.status')}
+              </Text>
+              <StatusBadge status={submission.status} />
+            </Box>
+          </HStack>
+
+          <VStack align="stretch" gap={2}>
+            <Text fontSize="sm" color="gray.600">
+              <strong>{t('challenge.admin.submissions.details.submitted')}</strong>{' '}
+              {formatDate(submission.submittedAt)}
+            </Text>
+            {submission.checkedAt && (
+              <>
+                <Text fontSize="sm" color="gray.600">
+                  <strong>{t('challenge.admin.submissions.details.checked')}</strong>{' '}
+                  {formatDate(submission.checkedAt)}
+                </Text>
+                <Text fontSize="sm" color="gray.600">
+                  <strong>{t('challenge.admin.submissions.details.check.time')}</strong>{' '}
+                  {t('challenge.admin.submissions.check.time', { time: getCheckTimeValue() })}
+                </Text>
+              </>
+            )}
+          </VStack>
+        </Box>
+
+        {/* Task */}
+        <Box
+          p={6}
+          bg="white"
+          borderRadius="lg"
+          boxShadow="sm"
+          borderWidth="1px"
+          borderColor="gray.200"
+        >
+          <Text fontWeight="bold" mb={4}>
+            {t('challenge.admin.submissions.details.task')} {taskTitle}
+          </Text>
+          <Box
+            p={4}
+            bg="gray.50"
+            borderRadius="md"
+            borderWidth="1px"
+            borderColor="gray.200"
+            maxH="400px"
+            overflowY="auto"
+          >
+            <ReactMarkdown>{taskDescription}</ReactMarkdown>
+          </Box>
+        </Box>
+
+        {/* Solution */}
+        <Box
+          p={6}
+          bg="white"
+          borderRadius="lg"
+          boxShadow="sm"
+          borderWidth="1px"
+          borderColor="gray.200"
+        >
+          <Text fontWeight="bold" mb={4}>
+            {t('challenge.admin.submissions.details.solution')}
+          </Text>
+          <Box
+            p={4}
+            bg="blue.50"
+            borderRadius="md"
+            borderWidth="1px"
+            borderColor="blue.200"
+            maxH="500px"
+            overflowY="auto"
+          >
+            <Text
+              fontFamily="monospace"
+              fontSize="sm"
+              whiteSpace="pre-wrap"
+              wordBreak="break-word"
+            >
+              {submission.result}
+            </Text>
+          </Box>
+        </Box>
+
+        {/* Feedback */}
+        {submission.feedback && (
+          <Box
+            p={6}
+            bg="white"
+            borderRadius="lg"
+            boxShadow="sm"
+            borderWidth="1px"
+            borderColor="gray.200"
+          >
+            <Text fontWeight="bold" mb={4}>
+              {t('challenge.admin.submissions.details.feedback')}
+            </Text>
+            <Box
+              p={4}
+              bg={submission.status === 'accepted' ? 'green.50' : 'red.50'}
+              borderRadius="md"
+              borderWidth="1px"
+              borderColor={submission.status === 'accepted' ? 'green.200' : 'red.200'}
+            >
+              <Text>{submission.feedback}</Text>
+            </Box>
+          </Box>
+        )}
+      </VStack>
+    </Box>
+  )
+}
+
--- a/src/pages/submissions/SubmissionsPage.tsx
+++ b/src/pages/submissions/SubmissionsPage.tsx
@@ -1,5 +1,6 @@
-import React, { useState } from 'react'
+import React, { useState, useMemo } from 'react'
 import { useTranslation } from 'react-i18next'
+import { useNavigate, useParams, Link } from 'react-router-dom'
 import {
  Box,
  Heading,
@@ -9,24 +10,26 @@ import {
  Button,
  HStack,
  VStack,
+  Badge,
+  Progress,
+  Grid,
+  SimpleGrid,
  Select,
-  DialogRoot,
-  DialogContent,
-  DialogHeader,
-  DialogTitle,
-  DialogBody,
-  DialogFooter,
-  DialogActionTrigger,
  createListCollection,
 } from '@chakra-ui/react'
-import ReactMarkdown from 'react-markdown'
-import { useGetSystemStatsV2Query, useGetUserSubmissionsQuery } from '../../__data__/api/api'
+import { getFeatureValue } from '@brojs/cli'
+import {
+  useGetChainsQuery,
+  useGetChainSubmissionsQuery,
+  useGetSystemStatsV2Query,
+  useGetUserSubmissionsQuery,
+} from '../../__data__/api/api'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { ErrorAlert } from '../../components/ErrorAlert'
 import { EmptyState } from '../../components/EmptyState'
 import { StatusBadge } from '../../components/StatusBadge'
+import { URLs } from '../../__data__/urls'
 import type {
-  ActiveParticipant,
  ChallengeSubmission,
  SubmissionStatus,
  ChallengeTask,
@@ -35,13 +38,50 @@ import type {

 export const SubmissionsPage: React.FC = () => {
  const { t } = useTranslation()
-  const { data: stats, isLoading: isStatsLoading, error: statsError, refetch: refetchStats } =
-    useGetSystemStatsV2Query(undefined)
+  const navigate = useNavigate()
+  const { chainId } = useParams<{ chainId?: string }>()

+  // Проверяем feature flag
+  const featureValue = getFeatureValue('challenge-admin', 'use-chain-submissions-api')
+  const useNewApi = featureValue?.value === 'true'
+
+  // Состояние для выбранного пользователя и фильтров
+  const [selectedUserId, setSelectedUserId] = useState<string | null>(null)
  const [searchQuery, setSearchQuery] = useState('')
  const [statusFilter, setStatusFilter] = useState<SubmissionStatus | 'all'>('all')
-  const [selectedSubmission, setSelectedSubmission] = useState<ChallengeSubmission | null>(null)
-  const [selectedUserId, setSelectedUserId] = useState<string | null>(null)
+
+  // Получаем список цепочек
+  const {
+    data: chains,
+    isLoading: isChainsLoading,
+    error: chainsError,
+    refetch: refetchChains,
+  } = useGetChainsQuery()
+
+  // Новый API: получаем данные по цепочке через новый эндпоинт
+  const {
+    data: chainData,
+    isLoading: isChainDataLoading,
+    error: chainDataError,
+    refetch: refetchChainData,
+  } = useGetChainSubmissionsQuery(
+    {
+      chainId: chainId!,
+      userId: selectedUserId || undefined,
+      status: statusFilter !== 'all' ? statusFilter : undefined,
+    },
+    { skip: !chainId || !useNewApi }
+  )
+
+  // Старый API: получаем общую статистику и submissions отдельно
+  const {
+    data: stats,
+    isLoading: isStatsLoading,
+    error: statsError,
+    refetch: refetchStats,
+  } = useGetSystemStatsV2Query(undefined, {
+    skip: !chainId || useNewApi,
+  })

  const {
    data: submissions,
@@ -50,42 +90,142 @@ export const SubmissionsPage: React.FC = () => {
    refetch: refetchSubmissions,
  } = useGetUserSubmissionsQuery(
    { userId: selectedUserId!, taskId: undefined },
-    { skip: !selectedUserId }
+    { skip: !selectedUserId || useNewApi }
  )

-  const isLoading = isStatsLoading || (selectedUserId && isSubmissionsLoading)
-  const error = statsError || submissionsError
+  const isLoading =
+    isChainsLoading ||
+    (chainId && useNewApi && isChainDataLoading) ||
+    (chainId && !useNewApi && isStatsLoading) ||
+    (selectedUserId && !useNewApi && isSubmissionsLoading)
+
+  const error = chainsError || (useNewApi ? chainDataError : statsError || submissionsError)

  const handleRetry = () => {
-    refetchStats()
-    if (selectedUserId) {
-      refetchSubmissions()
+    refetchChains()
+    if (chainId) {
+      if (useNewApi) {
+        refetchChainData()
+      } else {
+        refetchStats()
+        if (selectedUserId) {
+          refetchSubmissions()
+        }
+      }
    }
  }

-  if (isLoading) {
-    return <LoadingSpinner message={t('challenge.admin.submissions.loading')} />
-  }
+  // Получаем данные выбранной цепочки из списка chains (для старого API)
+  const selectedChain = useMemo(() => {
+    if (!chainId || !chains) return null
+    return chains.find((c) => c.id === chainId) || null
+  }, [chainId, chains])

-  if (error || !stats) {
-    return <ErrorAlert message={t('challenge.admin.submissions.load.error')} onRetry={handleRetry} />
-  }
+  // Получаем taskIds из текущей цепочки (для старого API)
+  const chainTaskIds = useMemo(() => {
+    if (!selectedChain) return new Set<string>()
+    return new Set(selectedChain.tasks.map((t) => t.id))
+  }, [selectedChain])

-  const participants: ActiveParticipant[] = stats.activeParticipants || []
-  const submissionsList: ChallengeSubmission[] = submissions || []
+  // Старый API: фильтруем участников - только те, кто имеет прогресс в этой цепочке
+  const chainParticipantsOld = useMemo(() => {
+    if (!stats?.activeParticipants || !chainId || useNewApi) return []

-  const filteredSubmissions = submissionsList.filter((submission) => {
-    const user = submission.user as ChallengeUser
-    const task = submission.task as ChallengeTask
+    return stats.activeParticipants
+      .map((participant) => {
+        const chainProgress = participant.chainProgress?.find((cp) => cp.chainId === chainId)
+        return {
+          ...participant,
+          progressPercent: chainProgress?.progressPercent ?? 0,
+          completedTasks: chainProgress?.completedTasks ?? 0,
+          totalTasks: selectedChain?.tasks.length ?? 0,
+        }
+      })
+      .sort((a, b) => a.progressPercent - b.progressPercent)
+  }, [stats?.activeParticipants, chainId, selectedChain, useNewApi])

-    const matchesSearch =
-      user.nickname.toLowerCase().includes(searchQuery.toLowerCase()) ||
-      task.title.toLowerCase().includes(searchQuery.toLowerCase())
+  // Старый API: фильтруем submissions только по заданиям из текущей цепочки
+  const filteredSubmissionsOld = useMemo(() => {
+    if (!submissions || chainTaskIds.size === 0 || useNewApi) return []

-    const matchesStatus = statusFilter === 'all' || submission.status === statusFilter
+    const normalizedSearchQuery = (searchQuery ?? '').toLowerCase()

-    return matchesSearch && matchesStatus
-  })
+    return submissions.filter((submission) => {
+      const rawTask = submission.task as ChallengeTask | string | undefined
+      const taskId =
+        rawTask && typeof rawTask === 'object' && 'id' in rawTask
+          ? rawTask.id
+          : typeof rawTask === 'string'
+            ? rawTask
+            : ''
+
+      if (!chainTaskIds.has(taskId)) return false
+
+      const rawUser = submission.user as ChallengeUser | string | undefined
+      const nickname =
+        rawUser && typeof rawUser === 'object' && 'nickname' in rawUser
+          ? (rawUser.nickname ?? '')
+          : ''
+
+      const title =
+        rawTask && typeof rawTask === 'object' && 'title' in rawTask
+          ? (rawTask.title ?? '')
+          : ''
+
+      const matchesSearch =
+        nickname.toLowerCase().includes(normalizedSearchQuery) ||
+        title.toLowerCase().includes(normalizedSearchQuery)
+
+      const matchesStatus = statusFilter === 'all' || submission.status === statusFilter
+
+      return matchesSearch && matchesStatus
+    })
+  }, [submissions, chainTaskIds, searchQuery, statusFilter, useNewApi])
+
+  // Новый API: фильтруем submissions по поисковому запросу (статус уже отфильтрован на сервере)
+  const filteredSubmissionsNew = useMemo(() => {
+    if (!chainData?.submissions || !useNewApi) return []
+
+    const normalizedSearchQuery = (searchQuery ?? '').toLowerCase()
+    if (!normalizedSearchQuery) return chainData.submissions
+
+    return chainData.submissions.filter((submission) => {
+      const rawUser = submission.user as ChallengeUser | string | undefined
+      const rawTask = submission.task as ChallengeTask | string | undefined
+
+      const nickname =
+        rawUser && typeof rawUser === 'object' && 'nickname' in rawUser
+          ? (rawUser.nickname ?? '')
+          : typeof rawUser === 'string'
+            ? rawUser
+            : ''
+
+      const title =
+        rawTask && typeof rawTask === 'object' && 'title' in rawTask
+          ? (rawTask.title ?? '')
+          : typeof rawTask === 'string'
+            ? rawTask
+            : ''
+
+      return (
+        nickname.toLowerCase().includes(normalizedSearchQuery) ||
+        title.toLowerCase().includes(normalizedSearchQuery)
+      )
+    })
+  }, [chainData?.submissions, searchQuery, useNewApi])
+
+  // Выбираем данные в зависимости от фичи
+  const filteredSubmissions = useNewApi ? filteredSubmissionsNew : filteredSubmissionsOld
+
+  // Сортируем участников по прогрессу
+  const sortedParticipants = useMemo(() => {
+    if (useNewApi) {
+      if (!chainData?.participants) return []
+      return [...chainData.participants].sort((a, b) => a.progressPercent - b.progressPercent)
+    } else {
+      return chainParticipantsOld
+    }
+  }, [chainData?.participants, chainParticipantsOld, useNewApi])

  const formatDate = (dateStr: string) => {
    return new Date(dateStr).toLocaleString('ru-RU', {
@@ -115,49 +255,150 @@ export const SubmissionsPage: React.FC = () => {
    ],
  })

-  const userOptions = createListCollection({
-    items: participants.map((participant) => ({
-      label: `${participant.nickname} (${participant.userId})`,
-      value: participant.userId,
-    })),
-  })
+  if (isLoading) {
+    return <LoadingSpinner message={t('challenge.admin.submissions.loading')} />
+  }

-  const hasParticipants = participants.length > 0
-  const hasSelectedUser = !!selectedUserId
+  if (error) {
+    return <ErrorAlert message={t('challenge.admin.submissions.load.error')} onRetry={handleRetry} />
+  }
+
+  // Если chainId не указан - показываем выбор цепочки
+  if (!chainId) {
+    return (
+      <Box>
+        <Box mb={6}>
+          <Heading mb={2}>{t('challenge.admin.submissions.title')}</Heading>
+          <Text color="gray.600" fontSize="sm">
+            {t('challenge.admin.submissions.select.chain')}
+          </Text>
+        </Box>
+
+        {chains && chains.length > 0 ? (
+          <SimpleGrid columns={{ base: 1, md: 2, lg: 3 }} gap={6}>
+            {chains.map((chain) => (
+              <Link key={chain.id} to={URLs.submissionsChain(chain.id)} style={{ textDecoration: 'none' }}>
+                <Box
+                  p={6}
+                  bg="white"
+                  borderRadius="lg"
+                  boxShadow="sm"
+                  borderWidth="1px"
+                  borderColor="gray.200"
+                  _hover={{
+                    boxShadow: 'md',
+                    borderColor: 'teal.400',
+                    transform: 'translateY(-2px)',
+                  }}
+                  transition="all 0.2s"
+                  cursor="pointer"
+                  height="100%"
+                >
+                  <VStack align="start" gap={3}>
+                    <Heading size="md" color="teal.600">
+                      {chain.name}
+                    </Heading>
+                    <HStack>
+                      <Badge colorPalette="teal" size="lg">
+                        {chain.tasks.length} {t('challenge.admin.submissions.chain.tasks')}
+                      </Badge>
+                      {!chain.isActive && (
+                        <Badge colorPalette="gray" size="lg">
+                          {t('challenge.admin.chains.list.status.inactive')}
+                        </Badge>
+                      )}
+                    </HStack>
+                    <Text fontSize="sm" color="gray.600" mt={2}>
+                      {t('challenge.admin.submissions.chain.click')}
+                    </Text>
+                  </VStack>
+                </Box>
+              </Link>
+            ))}
+          </SimpleGrid>
+        ) : (
+          <EmptyState
+            title={t('challenge.admin.submissions.no.chains.title')}
+            description={t('challenge.admin.submissions.no.chains.description')}
+          />
+        )}
+      </Box>
+    )
+  }
+
+  // Если цепочка выбрана но данных нет
+  if (useNewApi && !chainData) {
+    return (
+      <Box>
+        <Link to={URLs.submissions} style={{ textDecoration: 'none', color: '#319795' }}>
+          <Text fontSize="sm" _hover={{ textDecoration: 'underline' }} mb={4}>
+            ← {t('challenge.admin.submissions.back.to.chains')}
+          </Text>
+        </Link>
+        <ErrorAlert message={t('challenge.admin.common.not.found')} onRetry={handleRetry} />
+      </Box>
+    )
+  }
+
+  if (!useNewApi && !selectedChain) {
+    return (
+      <Box>
+        <Link to={URLs.submissions} style={{ textDecoration: 'none', color: '#319795' }}>
+          <Text fontSize="sm" _hover={{ textDecoration: 'underline' }} mb={4}>
+            ← {t('challenge.admin.submissions.back.to.chains')}
+          </Text>
+        </Link>
+        <ErrorAlert message={t('challenge.admin.common.not.found')} onRetry={handleRetry} />
+      </Box>
+    )
+  }
+
+  const chainName = useNewApi ? chainData?.chain.name : selectedChain?.name
+  const chainTasksCount = useNewApi ? chainData?.chain.tasks.length : selectedChain?.tasks.length

  return (
    <Box>
-      <Heading mb={6}>{t('challenge.admin.submissions.title')}</Heading>
+      {/* Header с навигацией */}
+      <Box mb={6}>
+        <HStack gap={2} mb={2}>
+          <Link to={URLs.submissions} style={{ textDecoration: 'none', color: '#319795' }}>
+            <Text fontSize="sm" _hover={{ textDecoration: 'underline' }}>
+              ← {t('challenge.admin.submissions.back.to.chains')}
+            </Text>
+          </Link>
+        </HStack>
+        <Heading mb={2}>{chainName}</Heading>
+        <Text color="gray.600" fontSize="sm">
+          {t('challenge.admin.submissions.chain.description', { count: chainTasksCount ?? 0 })}
+        </Text>
+      </Box>

-      {/* Filters */}
-      {hasParticipants && (
+      {/* Выбор участника и фильтры */}
+      {sortedParticipants.length > 0 && (
        <VStack mb={4} gap={3} align="stretch">
-          <HStack gap={4}>
-            <Select.Root
-              collection={userOptions}
-              value={selectedUserId ? [selectedUserId] : []}
-              onValueChange={(e) => setSelectedUserId(e.value[0] ?? null)}
-              maxW="300px"
-            >
-              <Select.Trigger>
-                <Select.ValueText placeholder={t('challenge.admin.submissions.filter.user')} />
-              </Select.Trigger>
-              <Select.Content>
-                {userOptions.items.map((option) => (
-                  <Select.Item key={option.value} item={option}>
-                    {option.label}
-                  </Select.Item>
-                ))}
-              </Select.Content>
-            </Select.Root>
+          <HStack gap={4} align="center" wrap="wrap">
+            {selectedUserId && (
+              <Button
+                size="sm"
+                variant="outline"
+                colorPalette="teal"
+                onClick={() => {
+                  setSelectedUserId(null)
+                  setSearchQuery('')
+                  setStatusFilter('all')
+                }}
+              >
+                {t('challenge.admin.submissions.filter.user.clear')}
+              </Button>
+            )}

-            {submissionsList.length > 0 && (
+            {selectedUserId && filteredSubmissions.length > 0 && (
              <>
                <Input
                  placeholder={t('challenge.admin.submissions.search.placeholder')}
                  value={searchQuery}
                  onChange={(e) => setSearchQuery(e.target.value)}
-                  maxW="400px"
+                  maxW="300px"
                />
                <Select.Root
                  collection={statusOptions}
@@ -182,22 +423,86 @@ export const SubmissionsPage: React.FC = () => {
        </VStack>
      )}

-      {!hasParticipants ? (
-        <EmptyState
-          title={t('challenge.admin.submissions.empty.title')}
-          description={t('challenge.admin.submissions.empty.description')}
-        />
-      ) : !hasSelectedUser ? (
-        <EmptyState
-          title={t('challenge.admin.submissions.empty.title')}
-          description={t('challenge.admin.submissions.filter.user')}
-        />
+      {/* Если не выбран пользователь - показываем обзор участников */}
+      {!selectedUserId ? (
+        <Box>
+          <Heading size="md" mb={4}>
+            {t('challenge.admin.submissions.participants.title')}
+          </Heading>
+          <Text mb={4} color="gray.600">
+            {t('challenge.admin.submissions.participants.description')}
+          </Text>
+
+          {sortedParticipants.length === 0 ? (
+            <EmptyState
+              title={t('challenge.admin.submissions.participants.empty.title')}
+              description={t('challenge.admin.submissions.participants.empty.description')}
+            />
+          ) : (
+            <Grid
+              templateColumns={{
+                base: 'repeat(1, minmax(0, 1fr))',
+                md: 'repeat(2, minmax(0, 1fr))',
+                lg: 'repeat(3, minmax(0, 1fr))',
+                xl: 'repeat(4, minmax(0, 1fr))',
+              }}
+              gap={3}
+            >
+              {sortedParticipants.map((participant) => {
+                const colorPalette =
+                  participant.progressPercent >= 70
+                    ? 'green'
+                    : participant.progressPercent >= 40
+                      ? 'orange'
+                      : 'red'
+
+                return (
+                  <Box
+                    key={participant.userId}
+                    p={3}
+                    borderWidth="1px"
+                    borderRadius="md"
+                    borderColor="gray.200"
+                    bg="white"
+                    _hover={{ bg: 'gray.50', borderColor: 'teal.300' }}
+                    cursor="pointer"
+                    onClick={() => setSelectedUserId(participant.userId)}
+                    transition="all 0.2s"
+                  >
+                    <HStack justify="space-between" mb={2} gap={2}>
+                      <Text fontSize="sm" fontWeight="medium" truncate maxW="180px">
+                        {participant.nickname}
+                      </Text>
+                      <Badge colorPalette={colorPalette} size="sm">
+                        {participant.progressPercent}%
+                      </Badge>
+                    </HStack>
+                    <Progress.Root value={participant.progressPercent} size="sm" colorPalette={colorPalette}>
+                      <Progress.Track>
+                        <Progress.Range />
+                      </Progress.Track>
+                    </Progress.Root>
+                    <HStack justify="space-between" mt={2}>
+                      <Text fontSize="xs" color="gray.500">
+                        {participant.completedTasks} / {participant.totalTasks}
+                      </Text>
+                      <Text fontSize="xs" color="gray.400">
+                        {t('challenge.admin.submissions.participants.click.to.view')}
+                      </Text>
+                    </HStack>
+                  </Box>
+                )
+              })}
+            </Grid>
+          )}
+        </Box>
      ) : filteredSubmissions.length === 0 ? (
        <EmptyState
          title={t('challenge.admin.submissions.search.empty.title')}
          description={t('challenge.admin.submissions.search.empty.description')}
        />
      ) : (
+        /* Таблица попыток выбранного пользователя */
        <Box bg="white" borderRadius="lg" boxShadow="sm" borderWidth="1px" borderColor="gray.200" overflowX="auto">
          <Table.Root size="sm">
            <Table.Header>
@@ -208,18 +513,34 @@ export const SubmissionsPage: React.FC = () => {
                <Table.ColumnHeader>{t('challenge.admin.submissions.table.attempt')}</Table.ColumnHeader>
                <Table.ColumnHeader>{t('challenge.admin.submissions.table.submitted')}</Table.ColumnHeader>
                <Table.ColumnHeader>{t('challenge.admin.submissions.table.check.time')}</Table.ColumnHeader>
-                <Table.ColumnHeader textAlign="right">{t('challenge.admin.submissions.table.actions')}</Table.ColumnHeader>
+                <Table.ColumnHeader textAlign="right">
+                  {t('challenge.admin.submissions.table.actions')}
+                </Table.ColumnHeader>
              </Table.Row>
            </Table.Header>
            <Table.Body>
              {filteredSubmissions.map((submission) => {
-                const user = submission.user as ChallengeUser
-                const task = submission.task as ChallengeTask
+                const rawUser = submission.user as ChallengeUser | string | undefined
+                const rawTask = submission.task as ChallengeTask | string | undefined
+
+                const nickname =
+                  rawUser && typeof rawUser === 'object' && 'nickname' in rawUser
+                    ? (rawUser.nickname ?? '')
+                    : typeof rawUser === 'string'
+                      ? rawUser
+                      : ''
+
+                const title =
+                  rawTask && typeof rawTask === 'object' && 'title' in rawTask
+                    ? (rawTask.title ?? '')
+                    : typeof rawTask === 'string'
+                      ? rawTask
+                      : ''

                return (
                  <Table.Row key={submission.id}>
-                    <Table.Cell fontWeight="medium">{user.nickname}</Table.Cell>
-                    <Table.Cell>{task.title}</Table.Cell>
+                    <Table.Cell fontWeight="medium">{nickname}</Table.Cell>
+                    <Table.Cell>{title}</Table.Cell>
                    <Table.Cell>
                      <StatusBadge status={submission.status} />
                    </Table.Cell>
@@ -243,7 +564,7 @@ export const SubmissionsPage: React.FC = () => {
                        size="sm"
                        variant="ghost"
                        colorPalette="teal"
-                        onClick={() => setSelectedSubmission(submission)}
+                        onClick={() => navigate(URLs.submissionDetails(chainId!, selectedUserId, submission.id))}
                      >
                        {t('challenge.admin.submissions.button.details')}
                      </Button>
@@ -255,166 +576,6 @@ export const SubmissionsPage: React.FC = () => {
          </Table.Root>
        </Box>
      )}
-
-      {/* Submission Details Modal */}
-      <SubmissionDetailsModal
-        submission={selectedSubmission}
-        isOpen={!!selectedSubmission}
-        onClose={() => setSelectedSubmission(null)}
-      />
    </Box>
  )
 }
-
-interface SubmissionDetailsModalProps {
-  submission: ChallengeSubmission | null
-  isOpen: boolean
-  onClose: () => void
-}
-
-const SubmissionDetailsModal: React.FC<SubmissionDetailsModalProps> = ({
-  submission,
-  isOpen,
-  onClose,
-}) => {
-  const { t } = useTranslation()
-  
-  if (!submission) return null
-
-  const user = submission.user as ChallengeUser
-  const task = submission.task as ChallengeTask
-
-  const formatDate = (dateStr: string) => {
-    return new Date(dateStr).toLocaleString('ru-RU', {
-      year: 'numeric',
-      month: 'long',
-      day: 'numeric',
-      hour: '2-digit',
-      minute: '2-digit',
-      second: '2-digit',
-    })
-  }
-
-  const getCheckTimeValue = () => {
-    if (!submission.checkedAt) return null
-    const submitted = new Date(submission.submittedAt).getTime()
-    const checked = new Date(submission.checkedAt).getTime()
-    return ((checked - submitted) / 1000).toFixed(2)
-  }
-
-  return (
-    <DialogRoot open={isOpen} onOpenChange={(e) => !e.open && onClose()} size="xl">
-      <DialogContent>
-        <DialogHeader>
-          <DialogTitle>{t('challenge.admin.submissions.details.title')} #{submission.attemptNumber}</DialogTitle>
-        </DialogHeader>
-        <DialogBody>
-          <VStack gap={6} align="stretch">
-            {/* Meta */}
-            <Box>
-              <HStack mb={4} justify="space-between">
-                <Box>
-                  <Text fontSize="sm" color="gray.600" mb={1}>
-                    {t('challenge.admin.submissions.details.user')}
-                  </Text>
-                  <Text fontWeight="bold">{user.nickname}</Text>
-                </Box>
-                <Box>
-                  <Text fontSize="sm" color="gray.600" mb={1}>
-                    {t('challenge.admin.submissions.details.status')}
-                  </Text>
-                  <StatusBadge status={submission.status} />
-                </Box>
-              </HStack>
-
-              <VStack align="stretch" gap={2}>
-                <Text fontSize="sm" color="gray.600">
-                  <strong>{t('challenge.admin.submissions.details.submitted')}</strong> {formatDate(submission.submittedAt)}
-                </Text>
-                {submission.checkedAt && (
-                  <>
-                    <Text fontSize="sm" color="gray.600">
-                      <strong>{t('challenge.admin.submissions.details.checked')}</strong> {formatDate(submission.checkedAt)}
-                    </Text>
-                    <Text fontSize="sm" color="gray.600">
-                      <strong>{t('challenge.admin.submissions.details.check.time')}</strong> {t('challenge.admin.submissions.check.time', { time: getCheckTimeValue() })}
-                    </Text>
-                  </>
-                )}
-              </VStack>
-            </Box>
-
-            {/* Task */}
-            <Box>
-              <Text fontWeight="bold" mb={2}>
-                {t('challenge.admin.submissions.details.task')} {task.title}
-              </Text>
-              <Box
-                p={4}
-                bg="gray.50"
-                borderRadius="md"
-                borderWidth="1px"
-                borderColor="gray.200"
-                maxH="200px"
-                overflowY="auto"
-              >
-                <ReactMarkdown>{task.description}</ReactMarkdown>
-              </Box>
-            </Box>
-
-            {/* Solution */}
-            <Box>
-              <Text fontWeight="bold" mb={2}>
-                {t('challenge.admin.submissions.details.solution')}
-              </Text>
-              <Box
-                p={4}
-                bg="blue.50"
-                borderRadius="md"
-                borderWidth="1px"
-                borderColor="blue.200"
-                maxH="300px"
-                overflowY="auto"
-              >
-                <Text
-                  fontFamily="monospace"
-                  fontSize="sm"
-                  whiteSpace="pre-wrap"
-                  wordBreak="break-word"
-                >
-                  {submission.result}
-                </Text>
-              </Box>
-            </Box>
-
-            {/* Feedback */}
-            {submission.feedback && (
-              <Box>
-                <Text fontWeight="bold" mb={2}>
-                  {t('challenge.admin.submissions.details.feedback')}
-                </Text>
-                <Box
-                  p={4}
-                  bg={submission.status === 'accepted' ? 'green.50' : 'red.50'}
-                  borderRadius="md"
-                  borderWidth="1px"
-                  borderColor={submission.status === 'accepted' ? 'green.200' : 'red.200'}
-                >
-                  <Text>{submission.feedback}</Text>
-                </Box>
-              </Box>
-            )}
-          </VStack>
-        </DialogBody>
-        <DialogFooter>
-          <DialogActionTrigger asChild>
-            <Button variant="outline" onClick={onClose}>
-              {t('challenge.admin.submissions.details.close')}
-            </Button>
-          </DialogActionTrigger>
-        </DialogFooter>
-      </DialogContent>
-    </DialogRoot>
-  )
-}
-
--- a/src/pages/tasks/TaskFormPage.tsx
+++ b/src/pages/tasks/TaskFormPage.tsx
@@ -19,6 +19,7 @@ import {
  useGetTaskQuery,
  useCreateTaskMutation,
  useUpdateTaskMutation,
+  useTestSubmissionMutation,
 } from '../../__data__/api/api'
 import { URLs } from '../../__data__/urls'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
@@ -35,11 +36,15 @@ export const TaskFormPage: React.FC = () => {
  })
  const [createTask, { isLoading: isCreating }] = useCreateTaskMutation()
  const [updateTask, { isLoading: isUpdating }] = useUpdateTaskMutation()
+  const [testSubmission, { isLoading: isTesting }] = useTestSubmissionMutation()

  const [title, setTitle] = useState('')
  const [description, setDescription] = useState('')
  const [hiddenInstructions, setHiddenInstructions] = useState('')
  const [showDescPreview, setShowDescPreview] = useState(false)
+  const [testAnswer, setTestAnswer] = useState('')
+  const [testStatus, setTestStatus] = useState<string | null>(null)
+  const [testFeedback, setTestFeedback] = useState<string | null>(null)

  useEffect(() => {
    if (task) {
@@ -49,6 +54,39 @@ export const TaskFormPage: React.FC = () => {
    }
  }, [task])

+  // Восстановление сохранённого тестового ответа для конкретной задачи
+  useEffect(() => {
+    if (!isEdit || !id) return
+    if (typeof window === 'undefined') return
+
+    const key = `challenge-admin.task-test-answer.${id}`
+    try {
+      const saved = window.localStorage.getItem(key)
+      if (saved) {
+        setTestAnswer(saved)
+      }
+    } catch {
+      // ignore localStorage errors
+    }
+  }, [isEdit, id])
+
+  // Сохранение тестового ответа в localStorage
+  useEffect(() => {
+    if (!isEdit || !id) return
+    if (typeof window === 'undefined') return
+
+    const key = `challenge-admin.task-test-answer.${id}`
+    try {
+      if (testAnswer.trim()) {
+        window.localStorage.setItem(key, testAnswer)
+      } else {
+        window.localStorage.removeItem(key)
+      }
+    } catch {
+      // ignore localStorage errors
+    }
+  }, [isEdit, id, testAnswer])
+
  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()

@@ -106,6 +144,59 @@ export const TaskFormPage: React.FC = () => {
    }
  }

+  const handleTestSubmit = async () => {
+    if (!task || !id) {
+      return
+    }
+
+    if (!testAnswer.trim()) {
+      toaster.create({
+        title: t('challenge.admin.common.validation.error'),
+        description: t('challenge.admin.tasks.test.validation.fill.answer'),
+        type: 'error',
+      })
+      return
+    }
+
+    setTestStatus(null)
+    setTestFeedback(null)
+
+    try {
+      const dummyUserId = task.creator?.sub || task.id
+
+      const result = await testSubmission({
+        userId: dummyUserId,
+        taskId: task.id,
+        result: testAnswer.trim(),
+        isTest: true,
+        hiddenInstructions: hiddenInstructions.trim() || undefined,
+      }).unwrap()
+
+      setTestStatus(result.status)
+      setTestFeedback(result.feedback ?? null)
+
+      toaster.create({
+        title: t('challenge.admin.common.success'),
+        description: t('challenge.admin.tasks.test.success'),
+        type: 'success',
+      })
+    } catch (err: unknown) {
+      const isForbidden =
+        err &&
+        typeof err === 'object' &&
+        'status' in err &&
+        (err as { status?: number }).status === 403
+
+      toaster.create({
+        title: t('challenge.admin.common.error'),
+        description: isForbidden
+          ? t('challenge.admin.tasks.test.forbidden')
+          : t('challenge.admin.tasks.test.error'),
+        type: 'error',
+      })
+    }
+  }
+
  if (isEdit && isLoadingTask) {
    return <LoadingSpinner message={t('challenge.admin.tasks.loading')} />
  }
@@ -309,6 +400,57 @@ export const TaskFormPage: React.FC = () => {
            </Box>
          )}

+          {/* Test submission (LLM check) */}
+          {isEdit && task && (
+            <Box p={4} bg="teal.50" borderRadius="md" borderWidth="1px" borderColor="teal.200">
+              <Text fontWeight="bold" mb={2} color="teal.900">
+                {t('challenge.admin.tasks.test.title')}
+              </Text>
+              <Text fontSize="sm" mb={3} color="teal.800">
+                {t('challenge.admin.tasks.test.description')}
+              </Text>
+              <Field.Root>
+                <Field.Label>{t('challenge.admin.tasks.test.field.answer')}</Field.Label>
+                <Textarea
+                  value={testAnswer}
+                  onChange={(e) => setTestAnswer(e.target.value)}
+                  placeholder={t('challenge.admin.tasks.test.field.answer.placeholder')}
+                  rows={6}
+                  fontFamily="monospace"
+                  disabled={isTesting}
+                />
+                <Field.HelperText>
+                  {t('challenge.admin.tasks.test.field.answer.helper')}
+                </Field.HelperText>
+              </Field.Root>
+
+              <HStack mt={3} align="flex-start" justify="space-between" gap={4}>
+                <Button
+                  onClick={handleTestSubmit}
+                  colorPalette="teal"
+                  disabled={isTesting || !testAnswer.trim()}
+                >
+                  {t('challenge.admin.tasks.test.button.run')}
+                </Button>
+
+                {(testStatus || testFeedback) && (
+                  <Box flex="1" p={3} bg="white" borderRadius="md" borderWidth="1px" borderColor="teal.100">
+                    {testStatus && (
+                      <Text fontSize="sm" fontWeight="medium" mb={1}>
+                        {t(`challenge.admin.tasks.test.status.${testStatus}`)}
+                      </Text>
+                    )}
+                    {testFeedback && (
+                      <Text fontSize="sm" whiteSpace="pre-wrap">
+                        {testFeedback}
+                      </Text>
+                    )}
+                  </Box>
+                )}
+              </HStack>
+            </Box>
+          )}
+
          {/* Actions */}
          <HStack gap={3} justify="flex-end">
            <Button variant="outline" onClick={() => navigate(URLs.tasks)} disabled={isLoading}>
--- a/src/pages/tasks/TasksListPage.tsx
+++ b/src/pages/tasks/TasksListPage.tsx
@@ -17,7 +17,6 @@ import { URLs } from '../../__data__/urls'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { ErrorAlert } from '../../components/ErrorAlert'
 import { EmptyState } from '../../components/EmptyState'
-import { ConfirmDialog } from '../../components/ConfirmDialog'
 import type { ChallengeTask } from '../../types/challenge'
 import { toaster } from '../../components/ui/toaster'

@@ -25,22 +24,24 @@ export const TasksListPage: React.FC = () => {
  const navigate = useNavigate()
  const { t } = useTranslation()
  const { data: tasks, isLoading, error, refetch } = useGetTasksQuery()
-  const [deleteTask, { isLoading: isDeleting }] = useDeleteTaskMutation()
+  const [deleteTask] = useDeleteTaskMutation()

  const [searchQuery, setSearchQuery] = useState('')
-  const [taskToDelete, setTaskToDelete] = useState<ChallengeTask | null>(null)

-  const handleDeleteTask = async () => {
-    if (!taskToDelete) return
+  const handleDeleteTask = async (task: ChallengeTask) => {
+    const confirmed = window.confirm(
+      t('challenge.admin.tasks.delete.confirm.message', { title: task.title })
+    )
+
+    if (!confirmed) return

    try {
-      await deleteTask(taskToDelete.id).unwrap()
+      await deleteTask(task.id).unwrap()
      toaster.create({
        title: t('challenge.admin.common.success'),
        description: t('challenge.admin.tasks.deleted'),
        type: 'success',
      })
-      setTaskToDelete(null)
    } catch (_err) {
      toaster.create({
        title: t('challenge.admin.common.error'),
@@ -152,7 +153,7 @@ export const TasksListPage: React.FC = () => {
                        size="sm"
                        variant="ghost"
                        colorPalette="red"
-                        onClick={() => setTaskToDelete(task)}
+                        onClick={() => handleDeleteTask(task)}
                      >
                        {t('challenge.admin.tasks.list.button.delete')}
                      </Button>
@@ -164,16 +165,6 @@ export const TasksListPage: React.FC = () => {
          </Table.Root>
        </Box>
      )}
-
-      <ConfirmDialog
-        isOpen={!!taskToDelete}
-        onClose={() => setTaskToDelete(null)}
-        onConfirm={handleDeleteTask}
-        title={t('challenge.admin.tasks.delete.confirm.title')}
-        message={t('challenge.admin.tasks.delete.confirm.message', { title: taskToDelete?.title })}
-        confirmLabel={t('challenge.admin.tasks.delete.confirm.button')}
-        isLoading={isDeleting}
-      />
    </Box>
  )
 }
--- a/src/pages/users/UserStatsPage.tsx
+++ b/src/pages/users/UserStatsPage.tsx
@@ -0,0 +1,196 @@
+import React from 'react'
+import { useTranslation } from 'react-i18next'
+import { useNavigate, useParams } from 'react-router-dom'
+import { Box, Heading, Text, Button, Grid, VStack, HStack, Badge, Progress } from '@chakra-ui/react'
+import { useGetUserStatsQuery } from '../../__data__/api/api'
+import { LoadingSpinner } from '../../components/LoadingSpinner'
+import { ErrorAlert } from '../../components/ErrorAlert'
+import { URLs } from '../../__data__/urls'
+
+interface RouteParams {
+  userId: string
+}
+
+export const UserStatsPage: React.FC = () => {
+  const { t } = useTranslation()
+  const navigate = useNavigate()
+  const { userId } = useParams<RouteParams>()
+
+  const { data: stats, isLoading, error, refetch } = useGetUserStatsQuery(userId!, {
+    skip: !userId,
+  })
+
+  const handleBack = () => {
+    navigate(URLs.users)
+  }
+
+  if (!userId) {
+    return (
+      <Box>
+        <Button variant="ghost" onClick={handleBack} mb={4}>
+          ← {t('challenge.admin.common.close')}
+        </Button>
+        <ErrorAlert message={t('challenge.admin.users.stats.no.data')} onRetry={handleBack} />
+      </Box>
+    )
+  }
+
+  if (isLoading) {
+    return <LoadingSpinner message={t('challenge.admin.users.stats.loading')} />
+  }
+
+  if (error) {
+    return (
+      <Box>
+        <Button variant="ghost" onClick={handleBack} mb={4}>
+          ← {t('challenge.admin.common.close')}
+        </Button>
+        <ErrorAlert message={t('challenge.admin.users.load.error')} onRetry={refetch} />
+      </Box>
+    )
+  }
+
+  if (!stats) {
+    return (
+      <Box>
+        <Button variant="ghost" onClick={handleBack} mb={4}>
+          ← {t('challenge.admin.common.close')}
+        </Button>
+        <Text color="gray.600">{t('challenge.admin.users.stats.no.data')}</Text>
+      </Box>
+    )
+  }
+
+  return (
+    <Box>
+      <HStack mb={6}>
+        <Button variant="ghost" onClick={handleBack}>
+          ← {t('challenge.admin.common.close')}
+        </Button>
+      </HStack>
+
+      <Heading mb={6}>{t('challenge.admin.users.stats.title')}</Heading>
+
+      <VStack gap={6} align="stretch">
+        {/* Overview */}
+        <Grid templateColumns="repeat(auto-fit, minmax(150px, 1fr))" gap={4}>
+          <Box>
+            <Text fontSize="sm" color="gray.600">
+              {t('challenge.admin.users.stats.completed')}
+            </Text>
+            <Text fontSize="2xl" fontWeight="bold" color="green.600">
+              {stats.completedTasks}
+            </Text>
+          </Box>
+          <Box>
+            <Text fontSize="sm" color="gray.600">
+              {t('challenge.admin.users.stats.total.submissions')}
+            </Text>
+            <Text fontSize="2xl" fontWeight="bold" color="blue.600">
+              {stats.totalSubmissions}
+            </Text>
+          </Box>
+          <Box>
+            <Text fontSize="sm" color="gray.600">
+              {t('challenge.admin.users.stats.in.progress')}
+            </Text>
+            <Text fontSize="2xl" fontWeight="bold" color="orange.600">
+              {stats.inProgressTasks}
+            </Text>
+          </Box>
+          <Box>
+            <Text fontSize="sm" color="gray.600">
+              {t('challenge.admin.users.stats.needs.revision')}
+            </Text>
+            <Text fontSize="2xl" fontWeight="bold" color="red.600">
+              {stats.needsRevisionTasks}
+            </Text>
+          </Box>
+        </Grid>
+
+        {/* Chains Progress */}
+        {stats.chainStats.length > 0 && (
+          <Box>
+            <Text fontWeight="bold" mb={3}>
+              {t('challenge.admin.users.stats.chains.progress')}
+            </Text>
+            <VStack gap={3} align="stretch">
+              {stats.chainStats.map((chain) => (
+                <Box key={chain.chainId}>
+                  <HStack justify="space-between" mb={1}>
+                    <Text fontSize="sm" fontWeight="medium">
+                      {chain.chainName}
+                    </Text>
+                    <Text fontSize="sm" color="gray.600">
+                      {chain.completedTasks} / {chain.totalTasks}
+                    </Text>
+                  </HStack>
+                  <Progress.Root value={chain.progress} colorPalette="teal" size="sm">
+                    <Progress.Track>
+                      <Progress.Range />
+                    </Progress.Track>
+                  </Progress.Root>
+                </Box>
+              ))}
+            </VStack>
+          </Box>
+        )}
+
+        {/* Task Stats */}
+        {stats.taskStats.length > 0 && (
+          <Box>
+            <Text fontWeight="bold" mb={3}>
+              {t('challenge.admin.users.stats.tasks')}
+            </Text>
+            <VStack gap={2} align="stretch" maxH="300px" overflowY="auto">
+              {stats.taskStats.map((taskStat) => {
+                const getBadgeColor = () => {
+                  if (taskStat.status === 'completed') return 'green'
+                  if (taskStat.status === 'needs_revision') return 'red'
+                  return 'gray'
+                }
+
+                return (
+                  <Box
+                    key={taskStat.taskId}
+                    p={3}
+                    bg="gray.50"
+                    borderRadius="md"
+                    borderWidth="1px"
+                    borderColor="gray.200"
+                  >
+                    <HStack justify="space-between" mb={1}>
+                      <Text fontSize="sm" fontWeight="medium">
+                        {taskStat.taskTitle}
+                      </Text>
+                      <Badge colorPalette={getBadgeColor()}>
+                        {t(`challenge.admin.users.stats.status.${taskStat.status}`)}
+                      </Badge>
+                    </HStack>
+                    <Text fontSize="xs" color="gray.600">
+                      {t('challenge.admin.users.stats.attempts')} {taskStat.totalAttempts}
+                    </Text>
+                  </Box>
+                )
+              })}
+            </VStack>
+          </Box>
+        )}
+
+        {/* Average Check Time */}
+        <Box p={3} bg="purple.50" borderRadius="md">
+          <Text fontSize="sm" color="gray.700" mb={1}>
+            {t('challenge.admin.users.stats.avg.check.time')}
+          </Text>
+          <Text fontSize="lg" fontWeight="bold" color="purple.700">
+            {t('challenge.admin.dashboard.check.time.value', {
+              time: (stats.averageCheckTimeMs / 1000).toFixed(2),
+            })}
+          </Text>
+        </Box>
+      </VStack>
+    </Box>
+  )
+}
+
+
--- a/src/pages/users/UsersPage.tsx
+++ b/src/pages/users/UsersPage.tsx
@@ -1,38 +1,21 @@
 import React, { useState } from 'react'
 import { useTranslation } from 'react-i18next'
-import {
-  Box,
-  Heading,
-  Table,
-  Input,
-  Text,
-  Button,
-  DialogRoot,
-  DialogContent,
-  DialogHeader,
-  DialogTitle,
-  DialogBody,
-  DialogFooter,
-  DialogActionTrigger,
-  Grid,
-  VStack,
-  HStack,
-  Badge,
-  Progress,
-} from '@chakra-ui/react'
-import { useGetSystemStatsV2Query, useGetUserStatsQuery } from '../../__data__/api/api'
+import { useNavigate } from 'react-router-dom'
+import { Box, Heading, Table, Input, Text, Button } from '@chakra-ui/react'
+import { useGetSystemStatsV2Query } from '../../__data__/api/api'
 import type { ActiveParticipant } from '../../types/challenge'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { ErrorAlert } from '../../components/ErrorAlert'
 import { EmptyState } from '../../components/EmptyState'
+import { URLs } from '../../__data__/urls'

 export const UsersPage: React.FC = () => {
  const { t } = useTranslation()
+  const navigate = useNavigate()
  const { data: stats, isLoading, error, refetch } = useGetSystemStatsV2Query(undefined, {
    pollingInterval: 10000,
  })
  const [searchQuery, setSearchQuery] = useState('')
-  const [selectedUserId, setSelectedUserId] = useState<string | null>(null)

  if (isLoading) {
    return <LoadingSpinner message={t('challenge.admin.users.loading')} />
@@ -44,8 +27,10 @@ export const UsersPage: React.FC = () => {

  const users: ActiveParticipant[] = stats.activeParticipants || []

+  const normalizedQuery = (searchQuery ?? '').toLowerCase()
+
  const filteredUsers = users.filter((user) =>
-    user.nickname.toLowerCase().includes(searchQuery.toLowerCase())
+    (user.nickname ?? '').toLowerCase().includes(normalizedQuery)
  )

  return (
@@ -106,7 +91,7 @@ export const UsersPage: React.FC = () => {
                      size="sm"
                      variant="ghost"
                      colorPalette="teal"
-                      onClick={() => setSelectedUserId(user.userId)}
+                      onClick={() => navigate(URLs.userStats(user.userId))}
                    >
                      {t('challenge.admin.users.button.stats')}
                    </Button>
@@ -118,167 +103,6 @@ export const UsersPage: React.FC = () => {
        </Box>
      )}

-      {/* User Stats Modal */}
-      <UserStatsModal
-        userId={selectedUserId}
-        isOpen={!!selectedUserId}
-        onClose={() => setSelectedUserId(null)}
-      />
    </Box>
  )
 }
-
-interface UserStatsModalProps {
-  userId: string | null
-  isOpen: boolean
-  onClose: () => void
-}
-
-const UserStatsModal: React.FC<UserStatsModalProps> = ({ userId, isOpen, onClose }) => {
-  const { t } = useTranslation()
-  const { data: stats, isLoading } = useGetUserStatsQuery(userId!, {
-    skip: !userId,
-  })
-
-  return (
-    <DialogRoot open={isOpen} onOpenChange={(e) => !e.open && onClose()} size="xl">
-      <DialogContent>
-        <DialogHeader>
-          <DialogTitle>{t('challenge.admin.users.stats.title')}</DialogTitle>
-        </DialogHeader>
-        <DialogBody>
-          {isLoading ? (
-            <LoadingSpinner message={t('challenge.admin.users.stats.loading')} />
-          ) : !stats ? (
-            <Text color="gray.600">{t('challenge.admin.users.stats.no.data')}</Text>
-          ) : (
-            <VStack gap={6} align="stretch">
-              {/* Overview */}
-              <Grid templateColumns="repeat(auto-fit, minmax(150px, 1fr))" gap={4}>
-                <Box>
-                  <Text fontSize="sm" color="gray.600">
-                    {t('challenge.admin.users.stats.completed')}
-                  </Text>
-                  <Text fontSize="2xl" fontWeight="bold" color="green.600">
-                    {stats.completedTasks}
-                  </Text>
-                </Box>
-                <Box>
-                  <Text fontSize="sm" color="gray.600">
-                    {t('challenge.admin.users.stats.total.submissions')}
-                  </Text>
-                  <Text fontSize="2xl" fontWeight="bold" color="blue.600">
-                    {stats.totalSubmissions}
-                  </Text>
-                </Box>
-                <Box>
-                  <Text fontSize="sm" color="gray.600">
-                    {t('challenge.admin.users.stats.in.progress')}
-                  </Text>
-                  <Text fontSize="2xl" fontWeight="bold" color="orange.600">
-                    {stats.inProgressTasks}
-                  </Text>
-                </Box>
-                <Box>
-                  <Text fontSize="sm" color="gray.600">
-                    {t('challenge.admin.users.stats.needs.revision')}
-                  </Text>
-                  <Text fontSize="2xl" fontWeight="bold" color="red.600">
-                    {stats.needsRevisionTasks}
-                  </Text>
-                </Box>
-              </Grid>
-
-              {/* Chains Progress */}
-              {stats.chainStats.length > 0 && (
-                <Box>
-                  <Text fontWeight="bold" mb={3}>
-                    {t('challenge.admin.users.stats.chains.progress')}
-                  </Text>
-                  <VStack gap={3} align="stretch">
-                    {stats.chainStats.map((chain) => (
-                      <Box key={chain.chainId}>
-                        <HStack justify="space-between" mb={1}>
-                          <Text fontSize="sm" fontWeight="medium">
-                            {chain.chainName}
-                          </Text>
-                          <Text fontSize="sm" color="gray.600">
-                            {chain.completedTasks} / {chain.totalTasks}
-                          </Text>
-                        </HStack>
-                        <Progress.Root value={chain.progress} colorPalette="teal" size="sm">
-                          <Progress.Track>
-                            <Progress.Range />
-                          </Progress.Track>
-                        </Progress.Root>
-                      </Box>
-                    ))}
-                  </VStack>
-                </Box>
-              )}
-
-              {/* Task Stats */}
-              {stats.taskStats.length > 0 && (
-                <Box>
-                  <Text fontWeight="bold" mb={3}>
-                    {t('challenge.admin.users.stats.tasks')}
-                  </Text>
-                  <VStack gap={2} align="stretch" maxH="300px" overflowY="auto">
-                    {stats.taskStats.map((taskStat) => {
-                      const getBadgeColor = () => {
-                        if (taskStat.status === 'completed') return 'green'
-                        if (taskStat.status === 'needs_revision') return 'red'
-                        return 'gray'
-                      }
-                      
-                      return (
-                        <Box
-                          key={taskStat.taskId}
-                          p={3}
-                          bg="gray.50"
-                          borderRadius="md"
-                          borderWidth="1px"
-                          borderColor="gray.200"
-                        >
-                          <HStack justify="space-between" mb={1}>
-                            <Text fontSize="sm" fontWeight="medium">
-                              {taskStat.taskTitle}
-                            </Text>
-                            <Badge colorPalette={getBadgeColor()}>
-                              {t(`challenge.admin.users.stats.status.${taskStat.status}`)}
-                            </Badge>
-                          </HStack>
-                          <Text fontSize="xs" color="gray.600">
-                            {t('challenge.admin.users.stats.attempts')} {taskStat.totalAttempts}
-                          </Text>
-                        </Box>
-                      )
-                    })}
-                  </VStack>
-                </Box>
-              )}
-
-              {/* Average Check Time */}
-              <Box p={3} bg="purple.50" borderRadius="md">
-                <Text fontSize="sm" color="gray.700" mb={1}>
-                  {t('challenge.admin.users.stats.avg.check.time')}
-                </Text>
-                <Text fontSize="lg" fontWeight="bold" color="purple.700">
-                  {t('challenge.admin.dashboard.check.time.value', { time: (stats.averageCheckTimeMs / 1000).toFixed(2) })}
-                </Text>
-              </Box>
-            </VStack>
-          )}
-        </DialogBody>
-        <DialogFooter>
-          <DialogActionTrigger asChild>
-            <Button variant="outline" onClick={onClose}>
-              Закрыть
-            </Button>
-          </DialogActionTrigger>
-        </DialogFooter>
-      </DialogContent>
-    </DialogRoot>
-  )
-}
-
--- a/src/types/challenge.ts
+++ b/src/types/challenge.ts
@@ -27,6 +27,7 @@ export interface ChallengeChain {
  id: string
  name: string
  tasks: ChallengeTask[] // Populated
+  isActive: boolean
  createdAt: string
  updatedAt: string
 }
@@ -132,11 +133,23 @@ export interface UpdateTaskRequest {
 export interface CreateChainRequest {
  name: string
  taskIds: string[] // Array of task IDs
+  isActive?: boolean
 }

 export interface UpdateChainRequest {
  name?: string
  taskIds?: string[]
+  isActive?: boolean
+}
+
+export interface DuplicateChainRequest {
+  name?: string
+}
+
+export interface ClearSubmissionsResponse {
+  deletedCount: number
+  chainId: string
+  userId?: string
 }

 // ========== Stats v2 Types ==========
@@ -223,3 +236,46 @@ export interface SystemStatsV2 {
  chainsDetailed: ChainDetailed[]
 }

+// ========== Submissions / Checking ==========
+
+export interface SubmitRequest {
+  userId: string
+  taskId: string
+  result: string
+  // Флаг тестового режима: проверка без создания Submission и очереди
+  isTest?: boolean
+  // Временные скрытые инструкции для тестовой проверки (не сохраняются в задачу)
+  hiddenInstructions?: string
+}
+
+export interface TestSubmissionResult {
+  isTest: true
+  status: Exclude<SubmissionStatus, 'pending' | 'in_progress'>
+  feedback?: string
+}
+
+// ========== Chain Submissions API ==========
+
+export interface ChainSubmissionsParticipant {
+  userId: string
+  nickname: string
+  completedTasks: number
+  totalTasks: number
+  progressPercent: number
+}
+
+export interface ChainSubmissionsResponse {
+  chain: {
+    id: string
+    name: string
+    tasks: Array<{ id: string; title: string }>
+  }
+  participants: ChainSubmissionsParticipant[]
+  submissions: ChallengeSubmission[]
+  pagination: {
+    total: number
+    limit: number
+    offset: number
+  }
+}
+
--- a/stubs/api/data/chains.json
+++ b/stubs/api/data/chains.json
@@ -21,6 +21,7 @@
        "updatedAt": "2024-11-05T11:00:00.000Z"
      }
    ],
+    "isActive": true,
    "createdAt": "2024-11-01T09:00:00.000Z",
    "updatedAt": "2024-11-05T12:00:00.000Z"
  },
@@ -38,6 +39,7 @@
        "updatedAt": "2024-11-03T09:15:00.000Z"
      }
    ],
+    "isActive": false,
    "createdAt": "2024-11-03T08:00:00.000Z",
    "updatedAt": "2024-11-03T09:30:00.000Z"
  },
@@ -63,6 +65,7 @@
        "updatedAt": "2024-11-04T14:20:00.000Z"
      }
    ],
+    "isActive": true,
    "createdAt": "2024-11-02T11:00:00.000Z",
    "updatedAt": "2024-11-04T15:00:00.000Z"
  }
--- a/stubs/api/data/stats-v2.json
+++ b/stubs/api/data/stats-v2.json
@@ -200,6 +200,28 @@
    }
  ],
  "activeParticipants": [
+    {
+      "userId": "6909b51512c75d75a36a52bf",
+      "nickname": "Примаков А.А.",
+      "totalSubmissions": 14,
+      "completedTasks": 1,
+      "chainProgress": [
+          {
+              "chainId": "6909ad8612c75d75a36a4c58",
+              "chainName": "Это тестовая цепочка заданий",
+              "totalTasks": 2,
+              "completedTasks": 1,
+              "progressPercent": 50
+          },
+          {
+              "chainId": "690a30b1e723507972c44098",
+              "chainName": "Навыки работы с нейросетями для начинающих (пошагово)",
+              "totalTasks": 20,
+              "completedTasks": 1,
+              "progressPercent": 5
+          }
+      ]
+  },
    {
      "userId": "user_1",
      "nickname": "alex_dev",
--- a/stubs/api/index.js
+++ b/stubs/api/index.js
@@ -61,6 +61,32 @@ const getStatsV2 = () => {
  return statsV2Cache;
 };

+// Enrich SystemStatsV2 with real user ids/nicknames from users.json
+const getStatsV2WithUsers = () => {
+  const statsV2 = getStatsV2();
+  const users = getUsers();
+
+  const mapParticipant = (participant, index) => {
+    const user = users[index];
+    if (!user) return participant;
+
+    return {
+      ...participant,
+      userId: user.id,
+      nickname: user.nickname,
+    };
+  };
+
+  return {
+    ...statsV2,
+    activeParticipants: statsV2.activeParticipants.map(mapParticipant),
+    chainsDetailed: statsV2.chainsDetailed.map((chain) => ({
+      ...chain,
+      participantProgress: chain.participantProgress.map(mapParticipant),
+    })),
+  };
+};
+
 router.use(timer());

 // ============= TASKS =============
@@ -158,8 +184,15 @@ router.delete('/challenge/task/:id', (req, res) => {

 // ============= CHAINS =============

-// GET /api/challenge/chains
+// GET /api/challenge/chains (user-facing list: only active chains)
 router.get('/challenge/chains', (req, res) => {
+  const chains = getChains();
+  const activeChains = chains.filter(c => c.isActive !== false);
+  respond(res, activeChains);
+});
+
+// GET /api/challenge/chains/admin (admin list: all chains)
+router.get('/challenge/chains/admin', (req, res) => {
  const chains = getChains();
  respond(res, chains);
 });
@@ -178,17 +211,17 @@ router.get('/challenge/chain/:id', (req, res) => {

 // POST /api/challenge/chain
 router.post('/challenge/chain', (req, res) => {
-  const { name, tasks } = req.body;
+  const { name, taskIds, isActive } = req.body;
  
-  if (!name || !tasks || !Array.isArray(tasks)) {
-    return respondError(res, 'Name and tasks array are required');
+  if (!name || !taskIds || !Array.isArray(taskIds)) {
+    return respondError(res, 'Name and taskIds array are required');
  }
  
  const chains = getChains();
  const allTasks = getTasks();
  
  // Populate tasks
-  const populatedTasks = tasks.map(taskId => {
+  const populatedTasks = taskIds.map(taskId => {
    const task = allTasks.find(t => t.id === taskId);
    return task ? {
      _id: task._id,
@@ -205,6 +238,7 @@ router.post('/challenge/chain', (req, res) => {
    id: `chain_${Date.now()}`,
    name,
    tasks: populatedTasks,
+    isActive: isActive !== undefined ? !!isActive : true,
    createdAt: new Date().toISOString(),
    updatedAt: new Date().toISOString()
  };
@@ -227,14 +261,16 @@ router.put('/challenge/chain/:id', (req, res) => {
    return respondError(res, 'Chain not found', 404);
  }
  
-  const { name, tasks } = req.body;
+  const { name, taskIds, tasks, isActive } = req.body;
  const chain = chains[chainIndex];
  
  if (name) chain.name = name;
  
-  if (tasks && Array.isArray(tasks)) {
+  const effectiveTaskIds = Array.isArray(taskIds) ? taskIds : (Array.isArray(tasks) ? tasks : null);
+
+  if (effectiveTaskIds) {
    const allTasks = getTasks();
-    const populatedTasks = tasks.map(taskId => {
+    const populatedTasks = effectiveTaskIds.map(taskId => {
      const task = allTasks.find(t => t.id === taskId);
      return task ? {
        _id: task._id,
@@ -248,6 +284,10 @@ router.put('/challenge/chain/:id', (req, res) => {
    
    chain.tasks = populatedTasks;
  }
+
+  if (isActive !== undefined) {
+    chain.isActive = !!isActive;
+  }
  
  chain.updatedAt = new Date().toISOString();
  
@@ -272,6 +312,84 @@ router.delete('/challenge/chain/:id', (req, res) => {
  respond(res, { success: true });
 });

+// POST /api/challenge/chain/:chainId/duplicate
+router.post('/challenge/chain/:chainId/duplicate', (req, res) => {
+  const chains = getChains();
+  const chainIndex = chains.findIndex(c => c.id === req.params.chainId);
+  
+  if (chainIndex === -1) {
+    return respondError(res, 'Chain not found', 404);
+  }
+  
+  const originalChain = chains[chainIndex];
+  const { name } = req.body;
+  
+  // Generate new name if not provided
+  const newName = name || `Копия - ${originalChain.name}`;
+  
+  // Create duplicate with same tasks but inactive
+  const duplicatedChain = {
+    _id: `chain_${Date.now()}`,
+    id: `chain_${Date.now()}`,
+    name: newName,
+    tasks: originalChain.tasks.map(task => ({
+      _id: task._id,
+      id: task.id,
+      title: task.title,
+      description: task.description,
+      createdAt: task.createdAt,
+      updatedAt: task.updatedAt
+    })),
+    isActive: false,
+    createdAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString()
+  };
+  
+  chains.push(duplicatedChain);
+  
+  // Update stats
+  const stats = getStats();
+  stats.chains = chains.length;
+  
+  respond(res, duplicatedChain);
+});
+
+// DELETE /api/challenge/chain/:chainId/submissions
+router.delete('/challenge/chain/:chainId/submissions', (req, res) => {
+  const chains = getChains();
+  const submissions = getSubmissions();
+  
+  const chain = chains.find(c => c.id === req.params.chainId);
+  
+  if (!chain) {
+    return respondError(res, 'Chain not found', 404);
+  }
+  
+  // Get task IDs from chain
+  const taskIds = new Set(chain.tasks.map(t => t.id));
+  
+  // Count and remove submissions for tasks in this chain
+  let deletedCount = 0;
+  for (let i = submissions.length - 1; i >= 0; i--) {
+    const sub = submissions[i];
+    const taskId = typeof sub.task === 'object' ? sub.task.id : sub.task;
+    
+    if (taskIds.has(taskId)) {
+      submissions.splice(i, 1);
+      deletedCount++;
+    }
+  }
+  
+  // Update stats
+  const stats = getStats();
+  stats.submissions.total = Math.max(0, stats.submissions.total - deletedCount);
+  
+  respond(res, {
+    deletedCount: deletedCount,
+    chainId: chain.id
+  });
+});
+
 // ============= STATS =============

 // GET /api/challenge/stats
@@ -282,7 +400,7 @@ router.get('/challenge/stats', (req, res) => {

 // GET /api/challenge/stats/v2
 router.get('/challenge/stats/v2', (req, res) => {
-  const statsV2 = getStatsV2();
+  const statsV2 = getStatsV2WithUsers();
  const chainId = req.query.chainId;
  
  // Если chainId не передан, возвращаем все данные
@@ -291,13 +409,32 @@ router.get('/challenge/stats/v2', (req, res) => {
    return;
  }
  
-  // Фильтруем данные по выбранной цепочке
-  const filteredChain = statsV2.chainsDetailed.find(c => c.chainId === chainId);
+  // Сначала проверяем наличие цепочки в chains.json
+  const chains = getChains();
+  const chain = chains.find(c => c.id === chainId);
  
-  if (!filteredChain) {
+  if (!chain) {
    return respondError(res, 'Chain not found', 404);
  }
  
+  // Ищем данные цепочки в stats-v2.json
+  let filteredChain = statsV2.chainsDetailed.find(c => c.chainId === chainId);
+  
+  // Если цепочка не найдена в stats-v2.json, создаем пустую структуру на основе chains.json
+  if (!filteredChain) {
+    filteredChain = {
+      chainId: chain.id,
+      name: chain.name,
+      totalTasks: chain.tasks.length,
+      tasks: chain.tasks.map(t => ({
+        taskId: t.id,
+        title: t.title,
+        description: t.description || ''
+      })),
+      participantProgress: []
+    };
+  }
+  
  // Фильтруем tasksTable - только задания из этой цепочки
  const chainTaskIds = new Set(filteredChain.tasks.map(t => t.taskId));
  const filteredTasksTable = statsV2.tasksTable.filter(t => chainTaskIds.has(t.taskId));
@@ -421,4 +558,116 @@ router.get('/challenge/user/:userId/submissions', (req, res) => {
  respond(res, filtered);
 });

+// GET /api/challenge/chain/:chainId/submissions
+router.get('/challenge/chain/:chainId/submissions', (req, res) => {
+  const chains = getChains();
+  const submissions = getSubmissions();
+  const users = getUsers();
+  
+  const chainId = req.params.chainId;
+  const userId = req.query.userId;
+  const status = req.query.status;
+  const limit = parseInt(req.query.limit) || 100;
+  const offset = parseInt(req.query.offset) || 0;
+  
+  // Найти цепочку
+  const chain = chains.find(c => c.id === chainId);
+  if (!chain) {
+    return respondError(res, 'Chain not found', 404);
+  }
+  
+  // Получить taskIds из цепочки
+  const taskIds = new Set(chain.tasks.map(t => t.id));
+  
+  // Фильтровать submissions по taskIds цепочки
+  let filteredSubmissions = submissions.filter(s => {
+    const taskId = typeof s.task === 'object' ? s.task.id : s.task;
+    return taskIds.has(taskId);
+  });
+  
+  // Применить фильтр по userId если указан
+  if (userId) {
+    filteredSubmissions = filteredSubmissions.filter(s => {
+      const subUserId = typeof s.user === 'object' ? s.user.id : s.user;
+      return subUserId === userId;
+    });
+  }
+  
+  // Применить фильтр по status если указан
+  if (status) {
+    filteredSubmissions = filteredSubmissions.filter(s => s.status === status);
+  }
+  
+  // Получить уникальных участников
+  const participantMap = new Map();
+  
+  filteredSubmissions.forEach(sub => {
+    const subUserId = typeof sub.user === 'object' ? sub.user.id : sub.user;
+    const subUserNickname = typeof sub.user === 'object' ? sub.user.nickname : '';
+    
+    // Найти nickname если не заполнен
+    let nickname = subUserNickname;
+    if (!nickname) {
+      const user = users.find(u => u.id === subUserId);
+      nickname = user ? user.nickname : subUserId;
+    }
+    
+    if (!participantMap.has(subUserId)) {
+      participantMap.set(subUserId, {
+        userId: subUserId,
+        nickname: nickname,
+        completedTasks: new Set(),
+        totalTasks: chain.tasks.length,
+      });
+    }
+    
+    // Если статус accepted, добавляем taskId в completedTasks
+    if (sub.status === 'accepted') {
+      const taskId = typeof sub.task === 'object' ? sub.task.id : sub.task;
+      participantMap.get(subUserId).completedTasks.add(taskId);
+    }
+  });
+  
+  // Преобразовать в массив и рассчитать прогресс
+  const participants = Array.from(participantMap.values()).map(p => ({
+    userId: p.userId,
+    nickname: p.nickname,
+    completedTasks: p.completedTasks.size,
+    totalTasks: p.totalTasks,
+    progressPercent: p.totalTasks > 0 
+      ? Math.round((p.completedTasks.size / p.totalTasks) * 100) 
+      : 0,
+  }));
+  
+  // Сортировать submissions по дате (новые сначала)
+  filteredSubmissions.sort((a, b) => 
+    new Date(b.submittedAt) - new Date(a.submittedAt)
+  );
+  
+  // Применить пагинацию
+  const total = filteredSubmissions.length;
+  const paginatedSubmissions = filteredSubmissions.slice(offset, offset + limit);
+  
+  // Формируем ответ
+  const response = {
+    chain: {
+      id: chain.id,
+      name: chain.name,
+      tasks: chain.tasks.map(t => ({
+        id: t.id,
+        title: t.title,
+      })),
+    },
+    participants: participants,
+    submissions: paginatedSubmissions,
+    pagination: {
+      total: total,
+      limit: limit,
+      offset: offset,
+    },
+  };
+  
+  respond(res, response);
+});
+
 module.exports = router;
Author	SHA1	Message	Date
Primakov Alexandr	e93de750fc	1.2.0	2025-12-14 14:47:50 +03:00
Primakov Alexandr	5f41c4a943	Enhance dialog components by adding smooth scroll to top functionality upon opening; update ConfirmDialog, ClearSubmissionsDialog, and DuplicateChainDialog for improved user experience. Remove unused ConfirmDialog from ChainsListPage and TasksListPage, streamlining code.	2025-12-14 14:46:28 +03:00
Primakov Alexandr	1d364a2351	Refactor ClearSubmissionsDialog and DuplicateChainDialog components by removing unnecessary whitespace; improve code cleanliness and maintainability.	2025-12-14 13:00:57 +03:00
Primakov Alexandr	88b95a7651	Add duplicate and clear submissions functionality for challenge chains; implement corresponding dialogs and API endpoints, enhancing user experience and task management. Update localization for new features in English and Russian.	2025-12-13 21:32:22 +03:00
Primakov Alexandr	04836ea6ce	Implement chain submissions API and update frontend to utilize new endpoint; enhance submissions page with feature flag for API selection, participant progress display, and improved filtering logic.	2025-12-13 20:32:23 +03:00
Primakov Alexandr	18e2ccb6bc	Add new API endpoint for retrieving submissions by challenge chain; update frontend to support chain selection and display participant progress. Enhance localization for submissions page in English and Russian.	2025-12-13 20:16:40 +03:00
Primakov Alexandr	9104280325	Update challengePlayer URL key in URLs data structure to use 'link.challenge.main' for improved navigation consistency.	2025-12-13 19:59:35 +03:00
Primakov Alexandr	d1bddcf972	Add functionality to restore and save test answers in localStorage for task editing; enhance user experience by preserving input across sessions.	2025-12-10 15:36:13 +03:00
Primakov Alexandr	86dffc802b	Refactor API response handling in test submission feature to align with server response structure; update ChainsListPage to use 'disabled' prop for button state instead of 'isDisabled', enhancing code clarity and consistency.	2025-12-10 15:13:05 +03:00
Primakov Alexandr	7b9cb044fa	Enhance test submission feature by adding optional hiddenInstructions field for temporary instructions during LLM checks; update API, UI components, and types to support this functionality, improving task evaluation for teachers and challenge authors.	2025-12-10 14:50:17 +03:00
Primakov Alexandr	fb25422df1	1.1.0	2025-12-10 12:41:53 +03:00
Primakov Alexandr	ec79dd58aa	Add test submission feature for LLM checks without creating submissions; update API and UI components to support new functionality, enhancing task evaluation for teachers and challenge authors. Update localization for test check messages in English and Russian.	2025-12-10 12:41:03 +03:00
Primakov Alexandr	173954f685	Add isActive field to challenge chains and update localization; implement functionality to toggle chain status in the UI, enhancing task management and user experience.	2025-12-10 12:02:11 +03:00
Primakov Alexandr	4e1b290f99	Add edit task button to ChainFormPage for improved task management; enhances user interaction by allowing direct navigation to task editing.	2025-12-10 11:23:24 +03:00
Primakov Alexandr	7323e80dcb	Add user stats page and refactor user navigation; replace modal with dedicated page for user statistics, enhancing routing and UI consistency. Update localization for new status keys in both English and Russian.	2025-12-10 11:11:17 +03:00
Primakov Alexandr	06bcb6ee51	Update navigation in SubmissionDetailsPage to include userId in URL if available; initialize selectedUserId in SubmissionsPage from search parameters for improved user experience.	2025-12-10 00:36:05 +03:00
Primakov Alexandr	71b6180ab9	Add Submission Details Page and Update Localization for Submissions Overview	2025-12-10 00:25:25 +03:00
Primakov Alexandr	8710718a12	Enhance SubmissionDetailsModal by adding max height and overflow properties to DialogContent for improved usability and responsiveness.	2025-12-10 00:07:32 +03:00
Primakov Alexandr	e4a1fe4b23	Refactor submissions page to improve participant progress display; replace table with grid layout for better responsiveness and user interaction. Update data processing for participant overview and overall progress calculation.	2025-12-10 00:01:24 +03:00
Primakov Alexandr	b3febaeea1	Refactor submission filtering and details display to handle various user and task data types; improve search functionality and localization for better user experience.	2025-12-09 23:53:42 +03:00
Primakov Alexandr	cbf2168e52	Add user filtering and progress overview to submissions page; enhance localization for user selection and progress display	2025-12-09 14:37:04 +03:00