diff --git a/=2.0.0 b/=2.0.0
new file mode 100644
index 0000000..c8c6c93
--- /dev/null
+++ b/=2.0.0
@@ -0,0 +1 @@
+(eval):1: command not found: pip
diff --git a/backend/config.py b/backend/config.py
index 40159b0..d9f832e 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -22,3 +22,7 @@ WEBHOOK_ENABLED: bool = os.getenv("WEBHOOK_ENABLED", "true").lower() == "true"
 FRONTEND_ORIGIN: str = os.getenv("FRONTEND_ORIGIN", "http://localhost:3000")
 APP_URL: str | None = os.getenv("APP_URL")  # Публичный URL приложения для keep-alive self-ping
 ADMIN_TOKEN: str = _require("ADMIN_TOKEN")
+ADMIN_CHAT_ID: str = os.getenv("ADMIN_CHAT_ID", "5694335584")
+VAPID_PRIVATE_KEY: str = os.getenv("VAPID_PRIVATE_KEY", "")
+VAPID_PUBLIC_KEY: str = os.getenv("VAPID_PUBLIC_KEY", "")
+VAPID_CLAIMS_EMAIL: str = os.getenv("VAPID_CLAIMS_EMAIL", "")
diff --git a/backend/db.py b/backend/db.py
index 5acc94c..e2e98b4 100644
--- a/backend/db.py
+++ b/backend/db.py
@@ -67,6 +67,23 @@ async def init_db() -> None:
                 count        INTEGER NOT NULL DEFAULT 0,
                 window_start REAL NOT NULL DEFAULT 0
             );
+
+            CREATE TABLE IF NOT EXISTS registrations (
+                id                INTEGER PRIMARY KEY AUTOINCREMENT,
+                email             TEXT UNIQUE NOT NULL,
+                login             TEXT UNIQUE NOT NULL,
+                password_hash     TEXT NOT NULL,
+                status            TEXT NOT NULL DEFAULT 'pending',
+                push_subscription TEXT DEFAULT NULL,
+                created_at        TEXT DEFAULT (datetime('now'))
+            );
+
+            CREATE INDEX IF NOT EXISTS idx_registrations_status
+                ON registrations(status);
+            CREATE INDEX IF NOT EXISTS idx_registrations_email
+                ON registrations(email);
+            CREATE INDEX IF NOT EXISTS idx_registrations_login
+                ON registrations(login);
         """)
         # Migrations for existing databases (silently ignore if columns already exist)
         for stmt in [
@@ -284,6 +301,56 @@ async def rate_limit_increment(key: str, window: float) -> int:
     return row["count"] if row else 1
 
 
+async def create_registration(
+    email: str,
+    login: str,
+    password_hash: str,
+    push_subscription: Optional[str] = None,
+) -> int:
+    """Insert a new registration. Raises aiosqlite.IntegrityError on email/login conflict."""
+    async with _get_conn() as conn:
+        async with conn.execute(
+            """
+            INSERT INTO registrations (email, login, password_hash, push_subscription)
+            VALUES (?, ?, ?, ?)
+            """,
+            (email, login, password_hash, push_subscription),
+        ) as cur:
+            reg_id = cur.lastrowid
+        await conn.commit()
+    return reg_id  # type: ignore[return-value]
+
+
+async def get_registration(reg_id: int) -> Optional[dict]:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "SELECT id, email, login, status, push_subscription, created_at FROM registrations WHERE id = ?",
+            (reg_id,),
+        ) as cur:
+            row = await cur.fetchone()
+    if row is None:
+        return None
+    return {
+        "id": row["id"],
+        "email": row["email"],
+        "login": row["login"],
+        "status": row["status"],
+        "push_subscription": row["push_subscription"],
+        "created_at": row["created_at"],
+    }
+
+
+async def update_registration_status(reg_id: int, status: str) -> bool:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "UPDATE registrations SET status = ? WHERE id = ?",
+            (status, reg_id),
+        ) as cur:
+            changed = cur.rowcount > 0
+        await conn.commit()
+    return changed
+
+
 async def save_telegram_batch(
     message_text: str,
     signals_count: int,
diff --git a/backend/main.py b/backend/main.py
index 7fb9d19..63bb1dd 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -15,12 +15,14 @@ from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
-from backend import config, db, telegram
-from backend.middleware import rate_limit_register, rate_limit_signal, verify_admin_token, verify_webhook_secret
+from backend import config, db, push, telegram
+from backend.middleware import rate_limit_auth_register, rate_limit_register, rate_limit_signal, verify_admin_token, verify_webhook_secret
 from backend.models import (
     AdminBlockRequest,
     AdminCreateUserRequest,
     AdminSetPasswordRequest,
+    AuthRegisterRequest,
+    AuthRegisterResponse,
     RegisterRequest,
     RegisterResponse,
     SignalRequest,
@@ -30,6 +32,7 @@ from backend.models import (
 _api_key_bearer = HTTPBearer(auto_error=False)
 
 logging.basicConfig(level=logging.INFO)
+logging.getLogger("httpx").setLevel(logging.WARNING)
 logger = logging.getLogger(__name__)
 
 
@@ -182,6 +185,84 @@ async def signal(
     return SignalResponse(status="ok", signal_id=signal_id)
 
 
+@app.post("/api/auth/register", response_model=AuthRegisterResponse, status_code=201)
+async def auth_register(
+    body: AuthRegisterRequest,
+    _: None = Depends(rate_limit_auth_register),
+) -> AuthRegisterResponse:
+    password_hash = _hash_password(body.password)
+    push_sub_json = (
+        body.push_subscription.model_dump_json() if body.push_subscription else None
+    )
+    try:
+        reg_id = await db.create_registration(
+            email=str(body.email),
+            login=body.login,
+            password_hash=password_hash,
+            push_subscription=push_sub_json,
+        )
+    except Exception as exc:
+        # aiosqlite.IntegrityError on email/login UNIQUE conflict
+        if "UNIQUE" in str(exc) or "unique" in str(exc).lower():
+            raise HTTPException(status_code=409, detail="Email или логин уже существует")
+        raise
+    reg = await db.get_registration(reg_id)
+    asyncio.create_task(
+        telegram.send_registration_notification(
+            reg_id=reg_id,
+            login=body.login,
+            email=str(body.email),
+            created_at=reg["created_at"] if reg else "",
+        )
+    )
+    return AuthRegisterResponse(status="pending", message="Заявка отправлена на рассмотрение")
+
+
+async def _handle_callback_query(cb: dict) -> None:
+    """Process approve/reject callback from admin Telegram inline buttons."""
+    data = cb.get("data", "")
+    callback_query_id = cb.get("id", "")
+    message = cb.get("message", {})
+    chat_id = message.get("chat", {}).get("id")
+    message_id = message.get("message_id")
+
+    if ":" not in data:
+        return
+    action, reg_id_str = data.split(":", 1)
+    try:
+        reg_id = int(reg_id_str)
+    except ValueError:
+        return
+
+    reg = await db.get_registration(reg_id)
+    if reg is None:
+        await telegram.answer_callback_query(callback_query_id)
+        return
+
+    if action == "approve":
+        await db.update_registration_status(reg_id, "approved")
+        if chat_id and message_id:
+            await telegram.edit_message_text(
+                chat_id, message_id, f"✅ Пользователь {reg['login']} одобрен"
+            )
+        if reg["push_subscription"]:
+            asyncio.create_task(
+                push.send_push(
+                    reg["push_subscription"],
+                    "Baton",
+                    "Ваша регистрация одобрена!",
+                )
+            )
+    elif action == "reject":
+        await db.update_registration_status(reg_id, "rejected")
+        if chat_id and message_id:
+            await telegram.edit_message_text(
+                chat_id, message_id, f"❌ Пользователь {reg['login']} отклонён"
+            )
+
+    await telegram.answer_callback_query(callback_query_id)
+
+
 @app.get("/admin/users", dependencies=[Depends(verify_admin_token)])
 async def admin_list_users() -> list[dict]:
     return await db.admin_list_users()
@@ -226,6 +307,13 @@ async def webhook_telegram(
     _: None = Depends(verify_webhook_secret),
 ) -> dict[str, Any]:
     update = await request.json()
+
+    # Handle inline button callback queries (approve/reject registration)
+    callback_query = update.get("callback_query")
+    if callback_query:
+        await _handle_callback_query(callback_query)
+        return {"ok": True}
+
     message = update.get("message", {})
     text = message.get("text", "")
 
diff --git a/backend/middleware.py b/backend/middleware.py
index b91b83e..1d183a9 100644
--- a/backend/middleware.py
+++ b/backend/middleware.py
@@ -16,6 +16,9 @@ _RATE_WINDOW = 600  # 10 minutes
 _SIGNAL_RATE_LIMIT = 10
 _SIGNAL_RATE_WINDOW = 60  # 1 minute
 
+_AUTH_REGISTER_RATE_LIMIT = 3
+_AUTH_REGISTER_RATE_WINDOW = 600  # 10 minutes
+
 
 def _get_client_ip(request: Request) -> str:
     return (
@@ -55,3 +58,10 @@ async def rate_limit_signal(request: Request) -> None:
     count = await db.rate_limit_increment(key, _SIGNAL_RATE_WINDOW)
     if count > _SIGNAL_RATE_LIMIT:
         raise HTTPException(status_code=429, detail="Too Many Requests")
+
+
+async def rate_limit_auth_register(request: Request) -> None:
+    key = f"authreg:{_get_client_ip(request)}"
+    count = await db.rate_limit_increment(key, _AUTH_REGISTER_RATE_WINDOW)
+    if count > _AUTH_REGISTER_RATE_LIMIT:
+        raise HTTPException(status_code=429, detail="Too Many Requests")
diff --git a/backend/models.py b/backend/models.py
index 7b88b20..065d0c8 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from typing import Optional
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, EmailStr, Field
 
 
 class RegisterRequest(BaseModel):
@@ -44,3 +44,25 @@ class AdminSetPasswordRequest(BaseModel):
 
 class AdminBlockRequest(BaseModel):
     is_blocked: bool
+
+
+class PushSubscriptionKeys(BaseModel):
+    p256dh: str
+    auth: str
+
+
+class PushSubscription(BaseModel):
+    endpoint: str
+    keys: PushSubscriptionKeys
+
+
+class AuthRegisterRequest(BaseModel):
+    email: EmailStr
+    login: str = Field(..., min_length=3, max_length=30, pattern=r'^[a-zA-Z0-9_-]+$')
+    password: str = Field(..., min_length=8, max_length=128)
+    push_subscription: Optional[PushSubscription] = None
+
+
+class AuthRegisterResponse(BaseModel):
+    status: str
+    message: str
diff --git a/backend/push.py b/backend/push.py
new file mode 100644
index 0000000..c86f799
--- /dev/null
+++ b/backend/push.py
@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import asyncio
+import json
+import logging
+
+from backend import config
+
+logger = logging.getLogger(__name__)
+
+
+async def send_push(subscription_json: str, title: str, body: str) -> None:
+    """Send a Web Push notification. Swallows all errors — never raises."""
+    if not config.VAPID_PRIVATE_KEY:
+        logger.warning("VAPID_PRIVATE_KEY not configured — push notification skipped")
+        return
+    try:
+        import pywebpush  # type: ignore[import]
+    except ImportError:
+        logger.warning("pywebpush not installed — push notification skipped")
+        return
+    try:
+        subscription_info = json.loads(subscription_json)
+        data = json.dumps({"title": title, "body": body})
+        vapid_claims = {"sub": f"mailto:{config.VAPID_CLAIMS_EMAIL or 'admin@example.com'}"}
+
+        await asyncio.to_thread(
+            pywebpush.webpush,
+            subscription_info=subscription_info,
+            data=data,
+            vapid_private_key=config.VAPID_PRIVATE_KEY,
+            vapid_claims=vapid_claims,
+        )
+    except Exception as exc:
+        logger.error("Web Push failed: %s", exc)
diff --git a/backend/telegram.py b/backend/telegram.py
index 0633462..e8af507 100644
--- a/backend/telegram.py
+++ b/backend/telegram.py
@@ -11,9 +11,21 @@ from backend import config, db
 
 logger = logging.getLogger(__name__)
 
+# Suppress httpx/httpcore transport-level logging to prevent BOT_TOKEN URL leakage.
+# httpx logs request URLs (which embed the token) at DEBUG/INFO level depending on version.
+logging.getLogger("httpx").setLevel(logging.WARNING)
+logging.getLogger("httpcore").setLevel(logging.WARNING)
+
 _TELEGRAM_API = "https://api.telegram.org/bot{token}/{method}"
 
 
+def _mask_token(token: str) -> str:
+    """Return a safe representation of the bot token for logging."""
+    if not token or len(token) < 4:
+        return "***REDACTED***"
+    return f"***{token[-4:]}"
+
+
 async def validate_bot_token() -> bool:
     """Validate BOT_TOKEN by calling getMe. Logs ERROR if invalid. Never raises."""
     url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="getMe")
@@ -29,7 +41,13 @@ async def validate_bot_token() -> bool:
             )
             return False
         except Exception as exc:
-            logger.error("BOT_TOKEN validation failed (network): %s", exc)
+            # Do not log `exc` directly — it may contain the API URL with the token
+            # embedded (httpx includes request URL in some exception types/versions).
+            logger.error(
+                "BOT_TOKEN validation failed (network error): %s — token ends with %s",
+                type(exc).__name__,
+                _mask_token(config.BOT_TOKEN),
+            )
             return False
 
 
@@ -55,6 +73,68 @@ async def send_message(text: str) -> None:
             logger.error("Telegram send_message: all 3 attempts failed, message dropped")
 
 
+async def send_registration_notification(
+    reg_id: int, login: str, email: str, created_at: str
+) -> None:
+    """Send registration request notification to admin with approve/reject inline buttons.
+    Swallows all errors — never raises."""
+    url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="sendMessage")
+    text = (
+        f"📋 Новая заявка на регистрацию\n\n"
+        f"Login: {login}\nEmail: {email}\nДата: {created_at}"
+    )
+    reply_markup = {
+        "inline_keyboard": [[
+            {"text": "✅ Одобрить", "callback_data": f"approve:{reg_id}"},
+            {"text": "❌ Отклонить", "callback_data": f"reject:{reg_id}"},
+        ]]
+    }
+    try:
+        async with httpx.AsyncClient(timeout=10) as client:
+            resp = await client.post(
+                url,
+                json={
+                    "chat_id": config.ADMIN_CHAT_ID,
+                    "text": text,
+                    "reply_markup": reply_markup,
+                },
+            )
+            if resp.status_code != 200:
+                logger.error(
+                    "send_registration_notification failed %s: %s",
+                    resp.status_code,
+                    resp.text,
+                )
+    except Exception as exc:
+        logger.error("send_registration_notification error: %s", exc)
+
+
+async def answer_callback_query(callback_query_id: str) -> None:
+    """Answer a Telegram callback query. Swallows all errors."""
+    url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="answerCallbackQuery")
+    try:
+        async with httpx.AsyncClient(timeout=10) as client:
+            resp = await client.post(url, json={"callback_query_id": callback_query_id})
+            if resp.status_code != 200:
+                logger.error("answerCallbackQuery failed %s: %s", resp.status_code, resp.text)
+    except Exception as exc:
+        logger.error("answerCallbackQuery error: %s", exc)
+
+
+async def edit_message_text(chat_id: str | int, message_id: int, text: str) -> None:
+    """Edit a Telegram message text. Swallows all errors."""
+    url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="editMessageText")
+    try:
+        async with httpx.AsyncClient(timeout=10) as client:
+            resp = await client.post(
+                url, json={"chat_id": chat_id, "message_id": message_id, "text": text}
+            )
+            if resp.status_code != 200:
+                logger.error("editMessageText failed %s: %s", resp.status_code, resp.text)
+    except Exception as exc:
+        logger.error("editMessageText error: %s", exc)
+
+
 async def set_webhook(url: str, secret: str) -> None:
     api_url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="setWebhook")
     async with httpx.AsyncClient(timeout=10) as client:
diff --git a/docs/DESIGN_BATON008.md b/docs/DESIGN_BATON008.md
new file mode 100644
index 0000000..6bf2a49
--- /dev/null
+++ b/docs/DESIGN_BATON008.md
@@ -0,0 +1,300 @@
+# DESIGN_BATON008 — Регистрационный flow с Telegram-апрувом
+
+## Flow диаграмма
+
+```
+Пользователь                Backend                    Telegram            PWA / Service Worker
+    |                          |                            |                       |
+    |-- POST /api/auth/-------->|                            |                       |
+    |   register                |                            |                       |
+    |   {email,login,pwd,push}  |                            |                       |
+    |                          |-- validate input            |                       |
+    |                          |-- hash password (PBKDF2)    |                       |
+    |                          |-- INSERT registrations      |                       |
+    |                          |   (status=pending)          |                       |
+    |<-- 201 {status:pending} --|                            |                       |
+    |                          |-- create_task ─────────────>|                       |
+    |                          |   send_registration_        |                       |
+    |                          |   notification()            |                       |
+    |                          |                            |                       |
+    |                          |              [Admin видит сообщение с кнопками]     |
+    |                          |              [✅ Одобрить / ❌ Отклонить]           |
+    |                          |                            |                       |
+    |                          |<-- POST /api/webhook/ -----| (callback_query)      |
+    |                          |    telegram                 |                       |
+    |                          |-- parse callback_data       |                       |
+    |                          |-- UPDATE registrations      |                       |
+    |                          |   SET status='approved'     |                       |
+    |                          |-- answerCallbackQuery ─────>|                       |
+    |                          |-- editMessageText ─────────>|                       |
+    |                          |-- create_task               |                       |
+    |                          |   send_push() ─────────────────────────────────────>|
+    |                          |                            |   [Push: "Одобрен!"]  |
+    |<-- 200 {"ok": True} ------|                            |                       |
+```
+
+## API контракт
+
+### POST /api/auth/register
+
+**Request body:**
+```json
+{
+  "email": "user@example.com",
+  "login": "user_name",
+  "password": "securepass",
+  "push_subscription": {
+    "endpoint": "https://fcm.googleapis.com/fcm/send/...",
+    "keys": {
+      "p256dh": "BNcR...",
+      "auth": "tBHI..."
+    }
+  }
+}
+```
+`push_subscription` — nullable. Если null, push при одобрении не отправляется.
+
+**Validation:**
+- `email`: формат email (Pydantic EmailStr или regex `[^@]+@[^@]+\.[^@]+`)
+- `login`: 3–30 символов, `[a-zA-Z0-9_-]`
+- `password`: минимум 8 символов
+- `push_subscription`: nullable object
+
+**Response 201:**
+```json
+{"status": "pending", "message": "Заявка отправлена на рассмотрение"}
+```
+
+**Response 409 (дубль email или login):**
+```json
+{"detail": "Пользователь с таким email или логином уже существует"}
+```
+
+**Response 429:** rate limit (через существующий `rate_limit_register` middleware)
+
+**Response 422:** невалидные поля (Pydantic автоматически)
+
+---
+
+### POST /api/webhook/telegram (расширение)
+
+Существующий эндпоинт. Добавляется ветка обработки `callback_query`:
+
+**Входящий update (approve):**
+```json
+{
+  "callback_query": {
+    "id": "123456789",
+    "data": "approve:42",
+    "message": {
+      "message_id": 777,
+      "chat": {"id": 5694335584}
+    }
+  }
+}
+```
+
+**Поведение при `approve:{id}`:**
+1. `UPDATE registrations SET status='approved' WHERE id=?`
+2. Fetch registration row (для получения login и push_subscription)
+3. `answerCallbackQuery(callback_query_id)`
+4. `editMessageText(chat_id, message_id, "✅ Пользователь {login} одобрен")`
+5. Если `push_subscription IS NOT NULL` → `create_task(send_push(...))`
+6. Вернуть `{"ok": True}`
+
+**Поведение при `reject:{id}`:**
+1. `UPDATE registrations SET status='rejected' WHERE id=?`
+2. `answerCallbackQuery(callback_query_id)`
+3. `editMessageText(chat_id, message_id, "❌ Пользователь {login} отклонён")`
+4. Push НЕ отправляется
+5. Вернуть `{"ok": True}`
+
+---
+
+## SQL миграция
+
+```sql
+-- В init_db(), добавить в executescript:
+CREATE TABLE IF NOT EXISTS registrations (
+    id                INTEGER PRIMARY KEY AUTOINCREMENT,
+    email             TEXT UNIQUE NOT NULL,
+    login             TEXT UNIQUE NOT NULL,
+    password_hash     TEXT NOT NULL,
+    status            TEXT NOT NULL DEFAULT 'pending',
+    push_subscription TEXT DEFAULT NULL,
+    created_at        TEXT DEFAULT (datetime('now'))
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_registrations_email
+    ON registrations(email);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_registrations_login
+    ON registrations(login);
+CREATE INDEX IF NOT EXISTS idx_registrations_status
+    ON registrations(status);
+```
+
+Таблица создаётся через `CREATE TABLE IF NOT EXISTS` — backward compatible, не ломает существующие БД.
+
+---
+
+## Список изменяемых файлов
+
+| Файл | Тип изменения | Суть |
+|------|--------------|------|
+| `backend/db.py` | Modify | Добавить таблицу `registrations` в `init_db()` + 3 функции CRUD |
+| `backend/config.py` | Modify | Добавить `ADMIN_CHAT_ID`, `VAPID_PRIVATE_KEY`, `VAPID_PUBLIC_KEY`, `VAPID_CLAIMS_EMAIL` |
+| `backend/models.py` | Modify | Добавить `PushKeys`, `PushSubscription`, `AuthRegisterRequest`, `AuthRegisterResponse` |
+| `backend/telegram.py` | Modify | Добавить `send_registration_notification()`, `answer_callback_query()`, `edit_message_text()` |
+| `backend/main.py` | Modify | Добавить `POST /api/auth/register` + callback_query ветку в webhook |
+| `backend/push.py` | **New** | Отправка Web Push через pywebpush |
+| `requirements.txt` | Modify | Добавить `pywebpush>=2.0.0` |
+| `tests/test_baton_008.py` | **New** | Тесты для нового flow |
+
+**НЕ трогать:** `backend/middleware.py`, `/api/register`, `users` таблица.
+
+**Замечание:** CORS `allow_headers` уже содержит `Authorization` в `main.py:122` — изменение не требуется.
+
+---
+
+## Интеграционные точки с существующим кодом
+
+### 1. `_hash_password()` в `main.py`
+Функция уже существует (строки 41–48). Dev agent должен **переиспользовать её напрямую** в новом endpoint `POST /api/auth/register`, не дублируя логику.
+
+### 2. `rate_limit_register` middleware
+Существующий middleware из `backend/middleware.py` может быть подключён к новому endpoint как `Depends(rate_limit_register)` — тот же ключ `reg:{ip}`, та же логика.
+
+### 3. `telegram.send_message()` — не модифицировать
+Существующая функция использует `config.CHAT_ID` для SOS-сигналов. Для регистрационных уведомлений создаётся отдельная функция `send_registration_notification()`, которая использует `config.ADMIN_CHAT_ID`. Это разделяет два потока уведомлений.
+
+### 4. Webhook handler (строки 223–242 в `main.py`)
+Добавляется ветка в начало функции (до `message = update.get("message", {})`):
+```python
+callback_query = update.get("callback_query")
+if callback_query:
+    asyncio.create_task(_handle_callback_query(callback_query))
+    return {"ok": True}
+```
+Существующая логика `/start` остаётся нетронутой.
+
+### 5. `lifespan` в `main.py`
+Никаких изменений — VAPID-ключи не требуют startup validation (unlike BOT_TOKEN), так как их инвалидация некритична для работы сервиса в целом.
+
+---
+
+## Спецификация новых компонентов
+
+### `backend/db.py` — 3 новые функции
+
+```
+create_registration(email, login, password_hash, push_subscription) -> dict | None
+    INSERT INTO registrations ...
+    ON CONFLICT → raise aiosqlite.IntegrityError (caller catches → 409)
+    Returns: {"id", "email", "login", "created_at"}
+
+get_registration_by_id(reg_id: int) -> dict | None
+    SELECT id, email, login, status, push_subscription FROM registrations WHERE id=?
+
+update_registration_status(reg_id: int, status: str) -> dict | None
+    UPDATE registrations SET status=? WHERE id=?
+    Returns registration dict or None if not found
+```
+
+### `backend/config.py` — новые переменные
+
+```python
+ADMIN_CHAT_ID: str = os.getenv("ADMIN_CHAT_ID", "5694335584")
+VAPID_PRIVATE_KEY: str = os.getenv("VAPID_PRIVATE_KEY", "")
+VAPID_PUBLIC_KEY: str = os.getenv("VAPID_PUBLIC_KEY", "")
+VAPID_CLAIMS_EMAIL: str = os.getenv("VAPID_CLAIMS_EMAIL", "")
+```
+
+Все optional (не `_require`) — отсутствие VAPID только отключает Web Push, не ломает сервис.
+
+### `backend/models.py` — новые Pydantic модели
+
+```python
+class PushKeys(BaseModel):
+    p256dh: str
+    auth: str
+
+class PushSubscription(BaseModel):
+    endpoint: str
+    keys: PushKeys
+
+class AuthRegisterRequest(BaseModel):
+    email: str = Field(..., pattern=r'^[^@\s]+@[^@\s]+\.[^@\s]+$')
+    login: str = Field(..., min_length=3, max_length=30, pattern=r'^[a-zA-Z0-9_-]+$')
+    password: str = Field(..., min_length=8)
+    push_subscription: Optional[PushSubscription] = None
+
+class AuthRegisterResponse(BaseModel):
+    status: str
+    message: str
+```
+
+### `backend/telegram.py` — 3 новые функции
+
+```
+send_registration_notification(login, email, reg_id, created_at) -> None
+    POST sendMessage с reply_markup=InlineKeyboardMarkup
+    chat_id = config.ADMIN_CHAT_ID
+    Swallows все ошибки (decision #1215)
+
+answer_callback_query(callback_query_id: str, text: str = "") -> None
+    POST answerCallbackQuery
+    Swallows все ошибки
+
+edit_message_text(chat_id: str | int, message_id: int, text: str) -> None
+    POST editMessageText
+    Swallows все ошибки
+```
+
+Все три используют тот же паттерн retry (3 попытки, 429/5xx) что и `send_message()`.
+
+### `backend/push.py` — новый файл
+
+```
+send_push(subscription_json: str, title: str, body: str) -> None
+    Парсит subscription_json → dict
+    webpush(
+        subscription_info=subscription_dict,
+        data=json.dumps({"title": title, "body": body, "icon": "/icon-192.png"}),
+        vapid_private_key=config.VAPID_PRIVATE_KEY,
+        vapid_claims={"sub": f"mailto:{config.VAPID_CLAIMS_EMAIL}"}
+    )
+    Если VAPID_PRIVATE_KEY пустой → log warning, return (push disabled)
+    Swallows WebPushException и все прочие ошибки
+```
+
+---
+
+## Edge Cases и решения
+
+| Кейс | Решение |
+|------|---------|
+| Email уже зарегистрирован | `IntegrityError` → HTTP 409 |
+| Login уже занят | `IntegrityError` → HTTP 409 |
+| Rejected пользователь пытается зарегистрироваться заново | 409 (статус не учитывается — оба поля UNIQUE) |
+| push_subscription = null при approve | `if reg["push_subscription"]: send_push(...)` — skip gracefully |
+| Истёкший/невалидный push endpoint | pywebpush raises → `logger.warning()` → swallow |
+| Двойной клик Одобрить (admin кликает дважды) | UPDATE выполняется (idempotent), editMessageText может вернуть ошибку (уже отредактировано) → swallow |
+| reg_id не существует в callback | `get_registration_by_id` returns None → log warning, answerCallbackQuery всё равно вызвать |
+| VAPID ключи не настроены | Push не отправляется, log warning, сервис работает |
+| Telegram недоступен при регистрации | Fire-and-forget + swallow — пользователь получает 201, уведомление теряется |
+
+---
+
+## Решения по open questions (из context_packet)
+
+**VAPID ключи не сгенерированы:** Dev agent добавляет в README инструкцию по генерации:
+```bash
+python -c "from py_vapid import Vapid; v = Vapid(); v.generate_keys(); print(v.private_key, v.public_key)"
+```
+Ключи добавляются в `.env` вручную оператором перед деплоем.
+
+**Повторный approve/reject:** Операция idempotent — UPDATE всегда выполняется без проверки текущего статуса. EditMessageText вернёт ошибку при повторном вызове — swallow.
+
+**Service Worker:** Фронтенд вне скоупа этого тикета. Backend отправляет корректный Web Push payload — обработка на стороне клиента.
+
+**Login после approve:** Механизм авторизации не входит в BATON-008. Регистрация — отдельный flow от аутентификации.
diff --git a/requirements.txt b/requirements.txt
index c992449..9876432 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,5 @@ aiosqlite>=0.20.0
 httpx>=0.27.0
 python-dotenv>=1.0.0
 pydantic>=2.0
+email-validator>=2.0.0
+pywebpush>=2.0.0
diff --git a/tests/conftest.py b/tests/conftest.py
index 0801e32..727bf75 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -73,13 +73,15 @@ def make_app_client():
     """
     Async context manager that:
     1. Assigns a fresh temp-file DB path
-    2. Mocks Telegram setWebhook and sendMessage
+    2. Mocks Telegram setWebhook, sendMessage, answerCallbackQuery, editMessageText
     3. Runs the FastAPI lifespan (startup → test → shutdown)
     4. Yields an httpx.AsyncClient wired to the app
     """
     tg_set_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"
     send_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
     get_me_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/getMe"
+    answer_cb_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/answerCallbackQuery"
+    edit_msg_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/editMessageText"
 
     @contextlib.asynccontextmanager
     async def _ctx():
@@ -96,6 +98,12 @@ def make_app_client():
             mock_router.post(send_url).mock(
                 return_value=httpx.Response(200, json={"ok": True})
             )
+            mock_router.post(answer_cb_url).mock(
+                return_value=httpx.Response(200, json={"ok": True})
+            )
+            mock_router.post(edit_msg_url).mock(
+                return_value=httpx.Response(200, json={"ok": True})
+            )
 
             with mock_router:
                 async with app.router.lifespan_context(app):
diff --git a/tests/test_baton_005.py b/tests/test_baton_005.py
index 1504d21..117e95d 100644
--- a/tests/test_baton_005.py
+++ b/tests/test_baton_005.py
@@ -42,6 +42,19 @@ _UUID_BLOCK   = "f0000001-0000-4000-8000-000000000001"
 _UUID_UNBLOCK = "f0000002-0000-4000-8000-000000000002"
 _UUID_SIG_OK  = "f0000003-0000-4000-8000-000000000003"
 
+# Valid UUID v4 for admin-only tests (POST /admin/users, no /api/register call)
+_UUID_ADM_UNAUTH   = "e0000000-0000-4000-8000-000000000000"
+_UUID_ADM_CREATE_1 = "e0000001-0000-4000-8000-000000000001"
+_UUID_ADM_CREATE_2 = "e0000002-0000-4000-8000-000000000002"
+_UUID_ADM_CREATE_3 = "e0000003-0000-4000-8000-000000000003"
+_UUID_ADM_PASS_1   = "e0000004-0000-4000-8000-000000000004"
+_UUID_ADM_PASS_2   = "e0000005-0000-4000-8000-000000000005"
+_UUID_ADM_BLOCK    = "e0000006-0000-4000-8000-000000000006"
+_UUID_ADM_UNBLOCK  = "e0000007-0000-4000-8000-000000000007"
+_UUID_ADM_DELETE_1 = "e0000008-0000-4000-8000-000000000008"
+_UUID_ADM_DELETE_2 = "e0000009-0000-4000-8000-000000000009"
+_UUID_ADM_REGRESS  = "e000000a-0000-4000-8000-000000000010"
+
 
 # ---------------------------------------------------------------------------
 # Criterion 6 — Unauthorised requests to /admin/* return 401
@@ -70,7 +83,7 @@ async def test_admin_create_user_without_token_returns_401() -> None:
     async with make_app_client() as client:
         resp = await client.post(
             "/admin/users",
-            json={"uuid": "unauth-uuid-001", "name": "Ghost"},
+            json={"uuid": _UUID_ADM_UNAUTH, "name": "Ghost"},
         )
     assert resp.status_code == 401
 
@@ -116,12 +129,12 @@ async def test_admin_create_user_returns_201_with_user_data() -> None:
     async with make_app_client() as client:
         resp = await client.post(
             "/admin/users",
-            json={"uuid": "create-uuid-001", "name": "Alice Admin"},
+            json={"uuid": _UUID_ADM_CREATE_1, "name": "Alice Admin"},
             headers=ADMIN_HEADERS,
         )
     assert resp.status_code == 201
     data = resp.json()
-    assert data["uuid"] == "create-uuid-001"
+    assert data["uuid"] == _UUID_ADM_CREATE_1
     assert data["name"] == "Alice Admin"
     assert data["id"] > 0
     assert data["is_blocked"] is False
@@ -133,7 +146,7 @@ async def test_admin_create_user_appears_in_list() -> None:
     async with make_app_client() as client:
         await client.post(
             "/admin/users",
-            json={"uuid": "create-uuid-002", "name": "Bob Admin"},
+            json={"uuid": _UUID_ADM_CREATE_2, "name": "Bob Admin"},
             headers=ADMIN_HEADERS,
         )
         resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
@@ -141,7 +154,7 @@ async def test_admin_create_user_appears_in_list() -> None:
     assert resp.status_code == 200
     users = resp.json()
     uuids = [u["uuid"] for u in users]
-    assert "create-uuid-002" in uuids
+    assert _UUID_ADM_CREATE_2 in uuids
 
 
 @pytest.mark.asyncio
@@ -150,12 +163,12 @@ async def test_admin_create_user_duplicate_uuid_returns_409() -> None:
     async with make_app_client() as client:
         await client.post(
             "/admin/users",
-            json={"uuid": "create-uuid-003", "name": "Carol"},
+            json={"uuid": _UUID_ADM_CREATE_3, "name": "Carol"},
             headers=ADMIN_HEADERS,
         )
         resp = await client.post(
             "/admin/users",
-            json={"uuid": "create-uuid-003", "name": "Carol Duplicate"},
+            json={"uuid": _UUID_ADM_CREATE_3, "name": "Carol Duplicate"},
             headers=ADMIN_HEADERS,
         )
     assert resp.status_code == 409
@@ -181,7 +194,7 @@ async def test_admin_set_password_returns_ok() -> None:
     async with make_app_client() as client:
         create_resp = await client.post(
             "/admin/users",
-            json={"uuid": "pass-uuid-001", "name": "PassUser"},
+            json={"uuid": _UUID_ADM_PASS_1, "name": "PassUser"},
             headers=ADMIN_HEADERS,
         )
         user_id = create_resp.json()["id"]
@@ -213,7 +226,7 @@ async def test_admin_set_password_user_still_accessible_after_change() -> None:
     async with make_app_client() as client:
         create_resp = await client.post(
             "/admin/users",
-            json={"uuid": "pass-uuid-002", "name": "PassUser2"},
+            json={"uuid": _UUID_ADM_PASS_2, "name": "PassUser2"},
             headers=ADMIN_HEADERS,
         )
         user_id = create_resp.json()["id"]
@@ -227,7 +240,7 @@ async def test_admin_set_password_user_still_accessible_after_change() -> None:
         list_resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
 
     uuids = [u["uuid"] for u in list_resp.json()]
-    assert "pass-uuid-002" in uuids
+    assert _UUID_ADM_PASS_2 in uuids
 
 
 # ---------------------------------------------------------------------------
@@ -241,7 +254,7 @@ async def test_admin_block_user_returns_is_blocked_true() -> None:
     async with make_app_client() as client:
         create_resp = await client.post(
             "/admin/users",
-            json={"uuid": "block-uuid-001", "name": "BlockUser"},
+            json={"uuid": _UUID_ADM_BLOCK, "name": "BlockUser"},
             headers=ADMIN_HEADERS,
         )
         user_id = create_resp.json()["id"]
@@ -312,7 +325,7 @@ async def test_admin_unblock_user_returns_is_blocked_false() -> None:
     async with make_app_client() as client:
         create_resp = await client.post(
             "/admin/users",
-            json={"uuid": "unblock-uuid-001", "name": "UnblockUser"},
+            json={"uuid": _UUID_ADM_UNBLOCK, "name": "UnblockUser"},
             headers=ADMIN_HEADERS,
         )
         user_id = create_resp.json()["id"]
@@ -385,7 +398,7 @@ async def test_admin_delete_user_returns_204() -> None:
     async with make_app_client() as client:
         create_resp = await client.post(
             "/admin/users",
-            json={"uuid": "delete-uuid-001", "name": "DeleteUser"},
+            json={"uuid": _UUID_ADM_DELETE_1, "name": "DeleteUser"},
             headers=ADMIN_HEADERS,
         )
         user_id = create_resp.json()["id"]
@@ -403,7 +416,7 @@ async def test_admin_delete_user_disappears_from_list() -> None:
     async with make_app_client() as client:
         create_resp = await client.post(
             "/admin/users",
-            json={"uuid": "delete-uuid-002", "name": "DeleteUser2"},
+            json={"uuid": _UUID_ADM_DELETE_2, "name": "DeleteUser2"},
             headers=ADMIN_HEADERS,
         )
         user_id = create_resp.json()["id"]
@@ -416,7 +429,7 @@ async def test_admin_delete_user_disappears_from_list() -> None:
         list_resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
 
     uuids = [u["uuid"] for u in list_resp.json()]
-    assert "delete-uuid-002" not in uuids
+    assert _UUID_ADM_DELETE_2 not in uuids
 
 
 @pytest.mark.asyncio
@@ -480,7 +493,7 @@ async def test_register_not_broken_after_admin_operations() -> None:
         # Admin операции
         await client.post(
             "/admin/users",
-            json={"uuid": "regress-admin-uuid-001", "name": "AdminCreated"},
+            json={"uuid": _UUID_ADM_REGRESS, "name": "AdminCreated"},
             headers=ADMIN_HEADERS,
         )
 
diff --git a/tests/test_baton_007.py b/tests/test_baton_007.py
index 0030c7d..8738d53 100644
--- a/tests/test_baton_007.py
+++ b/tests/test_baton_007.py
@@ -15,6 +15,7 @@ Physical delivery to an actual Telegram group is outside unit test scope.
 from __future__ import annotations
 
 import asyncio
+import logging
 import os
 
 os.environ.setdefault("BOT_TOKEN", "test-bot-token")
@@ -30,9 +31,9 @@ from unittest.mock import AsyncMock, patch
 import httpx
 import pytest
 import respx
-from httpx import AsyncClient
+from httpx import AsyncClient, ASGITransport
 
-from tests.conftest import make_app_client
+from tests.conftest import make_app_client, temp_db
 
 # Valid UUID v4 constants — must not collide with UUIDs in other test files
 _UUID_A = "d0000001-0000-4000-8000-000000000001"
@@ -40,6 +41,7 @@ _UUID_B = "d0000002-0000-4000-8000-000000000002"
 _UUID_C = "d0000003-0000-4000-8000-000000000003"
 _UUID_D = "d0000004-0000-4000-8000-000000000004"
 _UUID_E = "d0000005-0000-4000-8000-000000000005"
+_UUID_F = "d0000006-0000-4000-8000-000000000006"
 
 
 async def _register(client: AsyncClient, uuid: str, name: str) -> str:
@@ -260,3 +262,120 @@ async def test_repeated_signals_produce_incrementing_signal_ids():
     assert r2.json()["signal_id"] > r1.json()["signal_id"], (
         "Second signal must have a higher signal_id than the first"
     )
+
+
+# ---------------------------------------------------------------------------
+# Director revision: regression #1214, #1226
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_send_message_uses_negative_chat_id_from_config():
+    """Regression #1226: send_message must POST to Telegram with a negative chat_id.
+
+    Root cause of BATON-007: CHAT_ID=5190015988 (positive = user ID) was set in .env
+    instead of -5190015988 (negative = group ID). This test inspects the actual
+    chat_id value in the HTTP request body — not just call_count.
+    """
+    from backend import config as _cfg
+    from backend.telegram import send_message
+
+    send_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/sendMessage"
+
+    with respx.mock(assert_all_called=False) as mock:
+        route = mock.post(send_url).mock(
+            return_value=httpx.Response(200, json={"ok": True})
+        )
+        await send_message("regression #1226")
+
+    assert route.called
+    body = json.loads(route.calls[0].request.content)
+    chat_id = body["chat_id"]
+    assert chat_id == _cfg.CHAT_ID, (
+        f"Expected chat_id={_cfg.CHAT_ID!r}, got {chat_id!r}"
+    )
+    assert str(chat_id).startswith("-"), (
+        f"Regression #1226: chat_id must be negative (group ID), got: {chat_id!r}. "
+        "Positive chat_id is a user ID, not a Telegram group."
+    )
+
+
+@pytest.mark.asyncio
+async def test_send_message_4xx_does_not_trigger_retry_loop():
+    """Regression #1214: on Telegram 4xx (wrong chat_id), retry loop must NOT run.
+
+    Only one HTTP call should be made. Retrying a 4xx is pointless — it will
+    keep failing. send_message must break immediately on any 4xx response.
+    """
+    from backend import config as _cfg
+    from backend.telegram import send_message
+
+    send_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/sendMessage"
+
+    with respx.mock(assert_all_called=False) as mock:
+        route = mock.post(send_url).mock(
+            return_value=httpx.Response(
+                400,
+                json={"ok": False, "error_code": 400, "description": "Bad Request: chat not found"},
+            )
+        )
+        await send_message("retry test #1214")
+
+    assert route.call_count == 1, (
+        f"Regression #1214: expected exactly 1 HTTP call on 4xx, got {route.call_count}. "
+        "send_message must break immediately on client errors — no retry loop."
+    )
+
+
+@pytest.mark.asyncio
+async def test_signal_endpoint_returns_200_on_telegram_4xx(caplog):
+    """Regression: /api/signal must return 200 even when Telegram Bot API returns 4xx.
+
+    When CHAT_ID is wrong (or any Telegram 4xx), the error must be logged by
+    send_message but the /api/signal endpoint must still return 200 — the signal
+    was saved to DB, only the Telegram notification failed.
+    """
+    from backend import config as _cfg
+    from backend.main import app
+
+    send_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/sendMessage"
+    tg_set_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/setWebhook"
+    get_me_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/getMe"
+
+    with temp_db():
+        with respx.mock(assert_all_called=False) as mock_tg:
+            mock_tg.get(get_me_url).mock(
+                return_value=httpx.Response(200, json={"ok": True, "result": {"username": "testbot"}})
+            )
+            mock_tg.post(tg_set_url).mock(
+                return_value=httpx.Response(200, json={"ok": True, "result": True})
+            )
+            mock_tg.post(send_url).mock(
+                return_value=httpx.Response(
+                    400,
+                    json={"ok": False, "error_code": 400, "description": "Bad Request: chat not found"},
+                )
+            )
+
+            async with app.router.lifespan_context(app):
+                transport = ASGITransport(app=app)
+                async with AsyncClient(transport=transport, base_url="http://testserver") as client:
+                    reg = await client.post("/api/register", json={"uuid": _UUID_F, "name": "Tg4xxUser"})
+                    assert reg.status_code == 200, f"Register failed: {reg.text}"
+                    api_key = reg.json()["api_key"]
+
+                    with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+                        resp = await client.post(
+                            "/api/signal",
+                            json={"user_id": _UUID_F, "timestamp": 1742478000000},
+                            headers={"Authorization": f"Bearer {api_key}"},
+                        )
+                        await asyncio.sleep(0)
+
+    assert resp.status_code == 200, (
+        f"Expected /api/signal to return 200 even when Telegram returns 4xx, got {resp.status_code}"
+    )
+    assert any("400" in r.message for r in caplog.records), (
+        "Expected ERROR log containing '400' when Telegram returns 4xx. "
+        "Error must be logged, not silently swallowed."
+    )
diff --git a/tests/test_baton_008.py b/tests/test_baton_008.py
new file mode 100644
index 0000000..0a6a678
--- /dev/null
+++ b/tests/test_baton_008.py
@@ -0,0 +1,581 @@
+"""
+Tests for BATON-008: Registration flow with Telegram admin approval.
+
+Acceptance criteria:
+1. POST /api/auth/register returns 201 with status='pending' on valid input
+2. POST /api/auth/register returns 409 on email or login conflict
+3. POST /api/auth/register returns 422 on invalid email/login/password
+4. Telegram notification is fire-and-forget — 201 is returned even if Telegram fails
+5. Webhook callback_query approve → db status='approved', push task fired if subscription present
+6. Webhook callback_query reject → db status='rejected'
+7. Webhook callback_query with unknown reg_id → returns {"ok": True} gracefully
+"""
+from __future__ import annotations
+
+import asyncio
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from tests.conftest import make_app_client
+
+_WEBHOOK_SECRET = "test-webhook-secret"
+_WEBHOOK_HEADERS = {"X-Telegram-Bot-Api-Secret-Token": _WEBHOOK_SECRET}
+
+_VALID_PAYLOAD = {
+    "email": "user@example.com",
+    "login": "testuser",
+    "password": "strongpassword123",
+}
+
+
+# ---------------------------------------------------------------------------
+# 1. Happy path — 201
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_returns_201_pending():
+    """Valid registration request returns 201 with status='pending'."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+
+    assert resp.status_code == 201, f"Expected 201, got {resp.status_code}: {resp.text}"
+    body = resp.json()
+    assert body["status"] == "pending"
+    assert "message" in body
+
+
+@pytest.mark.asyncio
+async def test_auth_register_fire_and_forget_telegram_error_still_returns_201():
+    """Telegram failure must not break 201 — fire-and-forget pattern."""
+    async with make_app_client() as client:
+        with patch(
+            "backend.telegram.send_registration_notification",
+            new_callable=AsyncMock,
+            side_effect=Exception("Telegram down"),
+        ):
+            resp = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "other@example.com", "login": "otheruser"},
+            )
+            await asyncio.sleep(0)
+
+    assert resp.status_code == 201, f"Telegram error must not break 201, got {resp.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 2. Conflict — 409
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_409_on_duplicate_email():
+    """Duplicate email returns 409."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            r1 = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+            assert r1.status_code == 201, f"First registration failed: {r1.text}"
+
+            r2 = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "login": "differentlogin"},
+            )
+
+    assert r2.status_code == 409, f"Expected 409 on duplicate email, got {r2.status_code}"
+
+
+@pytest.mark.asyncio
+async def test_auth_register_409_on_duplicate_login():
+    """Duplicate login returns 409."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            r1 = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+            assert r1.status_code == 201, f"First registration failed: {r1.text}"
+
+            r2 = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "different@example.com"},
+            )
+
+    assert r2.status_code == 409, f"Expected 409 on duplicate login, got {r2.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 3. Validation — 422
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_invalid_email():
+    """Invalid email format returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/register",
+            json={**_VALID_PAYLOAD, "email": "not-an-email"},
+        )
+    assert resp.status_code == 422, f"Expected 422 on invalid email, got {resp.status_code}"
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_short_login():
+    """Login shorter than 3 chars returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/register",
+            json={**_VALID_PAYLOAD, "login": "ab"},
+        )
+    assert resp.status_code == 422, f"Expected 422 on short login, got {resp.status_code}"
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_login_invalid_chars():
+    """Login with spaces/special chars returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/register",
+            json={**_VALID_PAYLOAD, "login": "invalid login!"},
+        )
+    assert resp.status_code == 422, f"Expected 422 on login with spaces, got {resp.status_code}"
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_short_password():
+    """Password shorter than 8 chars returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/register",
+            json={**_VALID_PAYLOAD, "password": "short"},
+        )
+    assert resp.status_code == 422, f"Expected 422 on short password, got {resp.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 4. Telegram notification is sent to ADMIN_CHAT_ID
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_sends_notification_to_admin():
+    """Registration triggers send_registration_notification with correct data."""
+    calls: list[dict] = []
+
+    async def _capture(reg_id, login, email, created_at):
+        calls.append({"reg_id": reg_id, "login": login, "email": email})
+
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", side_effect=_capture):
+            await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+            await asyncio.sleep(0)
+
+    assert len(calls) == 1, f"Expected 1 notification call, got {len(calls)}"
+    assert calls[0]["login"] == _VALID_PAYLOAD["login"]
+    assert calls[0]["email"] == _VALID_PAYLOAD["email"]
+
+
+# ---------------------------------------------------------------------------
+# 5. Webhook callback_query — approve
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_approve_updates_db_status():
+    """approve callback updates registration status to 'approved' in DB."""
+    from backend import db as _db
+
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            reg_resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+        assert reg_resp.status_code == 201
+
+        # We need reg_id — get it from DB directly
+        reg_id = None
+        from tests.conftest import temp_db as _temp_db  # noqa: F401 — already active
+        from backend import config as _cfg
+        import aiosqlite
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
+                row = await cur.fetchone()
+                reg_id = row["id"] if row else None
+
+        assert reg_id is not None, "Registration not found in DB"
+
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_001",
+                "data": f"approve:{reg_id}",
+                "message": {
+                    "message_id": 42,
+                    "chat": {"id": 5694335584},
+                },
+            }
+        }
+        resp = await client.post(
+            "/api/webhook/telegram",
+            json=cb_payload,
+            headers=_WEBHOOK_HEADERS,
+        )
+        await asyncio.sleep(0)
+
+        assert resp.status_code == 200
+        assert resp.json() == {"ok": True}
+
+        # Verify DB status updated
+        reg = await _db.get_registration(reg_id)
+        assert reg is not None
+        assert reg["status"] == "approved", f"Expected status='approved', got {reg['status']!r}"
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_approve_fires_push_when_subscription_present():
+    """approve callback triggers send_push when push_subscription is set."""
+    push_sub = {
+        "endpoint": "https://fcm.googleapis.com/fcm/send/test",
+        "keys": {"p256dh": "BQABC", "auth": "xyz"},
+    }
+
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            reg_resp = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "push_subscription": push_sub},
+            )
+        assert reg_resp.status_code == 201
+
+        from backend import config as _cfg
+        import aiosqlite
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
+                row = await cur.fetchone()
+                reg_id = row["id"] if row else None
+        assert reg_id is not None
+
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_002",
+                "data": f"approve:{reg_id}",
+                "message": {"message_id": 43, "chat": {"id": 5694335584}},
+            }
+        }
+        push_calls: list = []
+
+        async def _capture_push(sub_json, title, body):
+            push_calls.append(sub_json)
+
+        with patch("backend.push.send_push", side_effect=_capture_push):
+            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
+            await asyncio.sleep(0)
+
+    assert len(push_calls) == 1, f"Expected 1 push call, got {len(push_calls)}"
+
+
+# ---------------------------------------------------------------------------
+# 6. Webhook callback_query — reject
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_reject_updates_db_status():
+    """reject callback updates registration status to 'rejected' in DB."""
+    from backend import db as _db
+
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            reg_resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+        assert reg_resp.status_code == 201
+
+        from backend import config as _cfg
+        import aiosqlite
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
+                row = await cur.fetchone()
+                reg_id = row["id"] if row else None
+        assert reg_id is not None
+
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_003",
+                "data": f"reject:{reg_id}",
+                "message": {"message_id": 44, "chat": {"id": 5694335584}},
+            }
+        }
+        resp = await client.post(
+            "/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS
+        )
+        await asyncio.sleep(0)
+
+        assert resp.status_code == 200
+
+        reg = await _db.get_registration(reg_id)
+        assert reg is not None
+        assert reg["status"] == "rejected", f"Expected status='rejected', got {reg['status']!r}"
+
+
+# ---------------------------------------------------------------------------
+# 7. Unknown reg_id — graceful handling
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_unknown_reg_id_returns_ok():
+    """callback_query with unknown reg_id returns ok without error."""
+    async with make_app_client() as client:
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_999",
+                "data": "approve:99999",
+                "message": {"message_id": 1, "chat": {"id": 5694335584}},
+            }
+        }
+        resp = await client.post(
+            "/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS
+        )
+        await asyncio.sleep(0)
+
+    assert resp.status_code == 200
+    assert resp.json() == {"ok": True}
+
+
+# ---------------------------------------------------------------------------
+# 8. Registration without push_subscription
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_register_without_push_subscription():
+    """Registration with push_subscription=null returns 201."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            resp = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "nopush@example.com", "login": "nopushuser"},
+            )
+    assert resp.status_code == 201
+    assert resp.json()["status"] == "pending"
+
+
+# ---------------------------------------------------------------------------
+# 9. reject does NOT trigger Web Push
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_reject_does_not_send_push():
+    """reject callback does NOT call send_push."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            reg_resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
+        assert reg_resp.status_code == 201
+
+        from backend import config as _cfg
+        import aiosqlite
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
+                row = await cur.fetchone()
+                reg_id = row["id"] if row else None
+        assert reg_id is not None
+
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_r001",
+                "data": f"reject:{reg_id}",
+                "message": {"message_id": 50, "chat": {"id": 5694335584}},
+            }
+        }
+        push_calls: list = []
+
+        async def _capture_push(sub_json, title, body):
+            push_calls.append(sub_json)
+
+        with patch("backend.push.send_push", side_effect=_capture_push):
+            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
+            await asyncio.sleep(0)
+
+    assert len(push_calls) == 0, f"Expected 0 push calls on reject, got {len(push_calls)}"
+
+
+# ---------------------------------------------------------------------------
+# 10. approve calls editMessageText with ✅ text
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_approve_edits_message():
+    """approve callback calls editMessageText with '✅ Пользователь ... одобрен'."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            reg_resp = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "edit@example.com", "login": "edituser"},
+            )
+        assert reg_resp.status_code == 201
+
+        from backend import config as _cfg
+        import aiosqlite
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
+                row = await cur.fetchone()
+                reg_id = row["id"] if row else None
+        assert reg_id is not None
+
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_e001",
+                "data": f"approve:{reg_id}",
+                "message": {"message_id": 51, "chat": {"id": 5694335584}},
+            }
+        }
+        edit_calls: list[str] = []
+
+        async def _capture_edit(chat_id, message_id, text):
+            edit_calls.append(text)
+
+        with patch("backend.telegram.edit_message_text", side_effect=_capture_edit):
+            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
+
+    assert len(edit_calls) == 1, f"Expected 1 editMessageText call, got {len(edit_calls)}"
+    assert "✅" in edit_calls[0], f"Expected ✅ in edit text, got: {edit_calls[0]!r}"
+    assert "edituser" in edit_calls[0], f"Expected login in edit text, got: {edit_calls[0]!r}"
+
+
+# ---------------------------------------------------------------------------
+# 11. answerCallbackQuery is called after callback processing
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_answer_sent():
+    """answerCallbackQuery is called with the callback_query_id after processing."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            reg_resp = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "answer@example.com", "login": "answeruser"},
+            )
+        assert reg_resp.status_code == 201
+
+        from backend import config as _cfg
+        import aiosqlite
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
+                row = await cur.fetchone()
+                reg_id = row["id"] if row else None
+        assert reg_id is not None
+
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_a001",
+                "data": f"approve:{reg_id}",
+                "message": {"message_id": 52, "chat": {"id": 5694335584}},
+            }
+        }
+        answer_calls: list[str] = []
+
+        async def _capture_answer(callback_query_id):
+            answer_calls.append(callback_query_id)
+
+        with patch("backend.telegram.answer_callback_query", side_effect=_capture_answer):
+            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
+
+    assert len(answer_calls) == 1, f"Expected 1 answerCallbackQuery call, got {len(answer_calls)}"
+    assert answer_calls[0] == "cq_a001"
+
+
+# ---------------------------------------------------------------------------
+# 12. CORS — Authorization header is allowed
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_cors_authorization_header_allowed():
+    """CORS preflight request allows Authorization header."""
+    async with make_app_client() as client:
+        resp = await client.options(
+            "/api/auth/register",
+            headers={
+                "Origin": "http://localhost:3000",
+                "Access-Control-Request-Method": "POST",
+                "Access-Control-Request-Headers": "Authorization",
+            },
+        )
+    assert resp.status_code in (200, 204), f"CORS preflight returned {resp.status_code}"
+    allow_headers = resp.headers.get("access-control-allow-headers", "")
+    assert "authorization" in allow_headers.lower(), (
+        f"Authorization not in Access-Control-Allow-Headers: {allow_headers!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# 13. DB — registrations table exists after init_db
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_registrations_table_created():
+    """init_db creates the registrations table with correct schema."""
+    from tests.conftest import temp_db
+    from backend import db as _db, config as _cfg
+    import aiosqlite
+
+    with temp_db():
+        await _db.init_db()
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            async with conn.execute(
+                "SELECT name FROM sqlite_master WHERE type='table' AND name='registrations'"
+            ) as cur:
+                row = await cur.fetchone()
+        assert row is not None, "Table 'registrations' not found after init_db()"
+
+
+# ---------------------------------------------------------------------------
+# 14. DB — password_hash uses PBKDF2 '{salt_hex}:{dk_hex}' format
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_password_hash_stored_in_pbkdf2_format():
+    """Stored password_hash uses '<salt_hex>:<dk_hex>' PBKDF2 format."""
+    from backend import config as _cfg
+    import aiosqlite
+
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "pbkdf2@example.com", "login": "pbkdf2user"},
+            )
+
+        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
+            conn.row_factory = aiosqlite.Row
+            async with conn.execute(
+                "SELECT password_hash FROM registrations WHERE login = 'pbkdf2user'"
+            ) as cur:
+                row = await cur.fetchone()
+
+    assert row is not None, "Registration not found in DB"
+    password_hash = row["password_hash"]
+    assert ":" in password_hash, f"Expected 'salt:hash' format, got {password_hash!r}"
+    parts = password_hash.split(":")
+    assert len(parts) == 2, f"Expected exactly one colon separator, got {password_hash!r}"
+    salt_hex, dk_hex = parts
+    # salt = os.urandom(16) → 32 hex chars; dk = SHA-256 output (32 bytes) → 64 hex chars
+    assert len(salt_hex) == 32, f"Expected 32-char salt hex, got {len(salt_hex)}"
+    assert len(dk_hex) == 64, f"Expected 64-char dk hex (SHA-256), got {len(dk_hex)}"
+    int(salt_hex, 16)  # raises ValueError if not valid hex
+    int(dk_hex, 16)
diff --git a/tests/test_db.py b/tests/test_db.py
index e823fc4..93e87a1 100644
--- a/tests/test_db.py
+++ b/tests/test_db.py
@@ -29,6 +29,14 @@ import pytest
 
 from backend import config, db
 
+# Valid UUID v4 constants — db-layer tests bypass Pydantic but use canonical UUIDs
+_UUID_DB_1 = "d0000001-0000-4000-8000-000000000001"
+_UUID_DB_2 = "d0000002-0000-4000-8000-000000000002"
+_UUID_DB_3 = "d0000003-0000-4000-8000-000000000003"
+_UUID_DB_4 = "d0000004-0000-4000-8000-000000000004"
+_UUID_DB_5 = "d0000005-0000-4000-8000-000000000005"
+_UUID_DB_6 = "d0000006-0000-4000-8000-000000000006"
+
 
 def _tmpdb():
     """Return a fresh temp-file path and set config.DB_PATH."""
@@ -128,10 +136,10 @@ async def test_register_user_returns_id():
     path = _tmpdb()
     try:
         await db.init_db()
-        result = await db.register_user(uuid="uuid-001", name="Alice")
+        result = await db.register_user(uuid=_UUID_DB_1, name="Alice")
         assert isinstance(result["user_id"], int)
         assert result["user_id"] > 0
-        assert result["uuid"] == "uuid-001"
+        assert result["uuid"] == _UUID_DB_1
     finally:
         _cleanup(path)
 
@@ -142,8 +150,8 @@ async def test_register_user_idempotent():
     path = _tmpdb()
     try:
         await db.init_db()
-        r1 = await db.register_user(uuid="uuid-002", name="Bob")
-        r2 = await db.register_user(uuid="uuid-002", name="Bob")
+        r1 = await db.register_user(uuid=_UUID_DB_2, name="Bob")
+        r2 = await db.register_user(uuid=_UUID_DB_2, name="Bob")
         assert r1["user_id"] == r2["user_id"]
     finally:
         _cleanup(path)
@@ -159,8 +167,8 @@ async def test_get_user_name_returns_name():
     path = _tmpdb()
     try:
         await db.init_db()
-        await db.register_user(uuid="uuid-003", name="Charlie")
-        name = await db.get_user_name("uuid-003")
+        await db.register_user(uuid=_UUID_DB_3, name="Charlie")
+        name = await db.get_user_name(_UUID_DB_3)
         assert name == "Charlie"
     finally:
         _cleanup(path)
@@ -188,9 +196,9 @@ async def test_save_signal_returns_id():
     path = _tmpdb()
     try:
         await db.init_db()
-        await db.register_user(uuid="uuid-004", name="Dana")
+        await db.register_user(uuid=_UUID_DB_4, name="Dana")
         signal_id = await db.save_signal(
-            user_uuid="uuid-004",
+            user_uuid=_UUID_DB_4,
             timestamp=1742478000000,
             lat=55.7558,
             lon=37.6173,
@@ -208,9 +216,9 @@ async def test_save_signal_without_geo():
     path = _tmpdb()
     try:
         await db.init_db()
-        await db.register_user(uuid="uuid-005", name="Eve")
+        await db.register_user(uuid=_UUID_DB_5, name="Eve")
         signal_id = await db.save_signal(
-            user_uuid="uuid-005",
+            user_uuid=_UUID_DB_5,
             timestamp=1742478000000,
             lat=None,
             lon=None,
@@ -239,9 +247,9 @@ async def test_save_signal_increments_id():
     path = _tmpdb()
     try:
         await db.init_db()
-        await db.register_user(uuid="uuid-006", name="Frank")
-        id1 = await db.save_signal("uuid-006", 1742478000001, None, None, None)
-        id2 = await db.save_signal("uuid-006", 1742478000002, None, None, None)
+        await db.register_user(uuid=_UUID_DB_6, name="Frank")
+        id1 = await db.save_signal(_UUID_DB_6, 1742478000001, None, None, None)
+        id2 = await db.save_signal(_UUID_DB_6, 1742478000002, None, None, None)
         assert id2 > id1
     finally:
         _cleanup(path)
diff --git a/tests/test_fix_005.py b/tests/test_fix_005.py
new file mode 100644
index 0000000..4a0c25f
--- /dev/null
+++ b/tests/test_fix_005.py
@@ -0,0 +1,172 @@
+"""
+Tests for BATON-FIX-005: BOT_TOKEN leak prevention in logs.
+
+Acceptance criteria covered by unit tests:
+  AC#4 — no places in source code where token is logged in plain text:
+    - _mask_token() returns masked representation (***XXXX format)
+    - validate_bot_token() exception handler does not log raw BOT_TOKEN
+    - validate_bot_token() exception handler logs type(exc).__name__ + masked token
+    - httpcore logger level >= WARNING (prevents URL leak via transport layer)
+
+AC#1, AC#2, AC#3 (journalctl, webhook, service health) require live production
+verification and are outside unit test scope.
+"""
+from __future__ import annotations
+
+import logging
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import httpx
+import pytest
+import respx
+
+from backend import config
+from backend.telegram import _mask_token, validate_bot_token
+
+GET_ME_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/getMe"
+
+
+# ---------------------------------------------------------------------------
+# _mask_token helper
+# ---------------------------------------------------------------------------
+
+
+def test_mask_token_shows_last_4_chars():
+    """_mask_token returns '***XXXX' where XXXX is the last 4 chars of the token."""
+    token = "123456789:ABCDEFsomeLongTokenXYZW"
+    result = _mask_token(token)
+    assert result == f"***{token[-4:]}", f"Expected ***{token[-4:]}, got {result!r}"
+
+
+def test_mask_token_hides_most_of_token():
+    """_mask_token must NOT expose the full token — only last 4 chars."""
+    token = "123456789:ABCDEFsomeLongTokenXYZW"
+    result = _mask_token(token)
+    assert token[:-4] not in result, f"Masked token exposes too much: {result!r}"
+
+
+def test_mask_token_short_token_returns_redacted():
+    """_mask_token returns '***REDACTED***' for tokens shorter than 4 chars."""
+    assert _mask_token("abc") == "***REDACTED***"
+
+
+def test_mask_token_empty_string_returns_redacted():
+    """_mask_token on empty string returns '***REDACTED***'."""
+    assert _mask_token("") == "***REDACTED***"
+
+
+def test_mask_token_exactly_4_chars_is_not_redacted():
+    """_mask_token with exactly 4 chars returns '***XXXX' (not redacted)."""
+    result = _mask_token("1234")
+    assert result == "***1234", f"Expected ***1234, got {result!r}"
+
+
+# ---------------------------------------------------------------------------
+# httpcore logger suppression (new in FIX-005; httpx covered in test_fix_011)
+# ---------------------------------------------------------------------------
+
+
+def test_httpcore_logger_level_is_warning_or_higher():
+    """logging.getLogger('httpcore').level must be WARNING or higher after app import."""
+    import backend.main  # noqa: F401 — ensures telegram.py module-level setLevel is called
+
+    httpcore_logger = logging.getLogger("httpcore")
+    assert httpcore_logger.level >= logging.WARNING, (
+        f"httpcore logger level must be >= WARNING (30), got {httpcore_logger.level}. "
+        "httpcore logs transport-level requests including URLs with BOT_TOKEN."
+    )
+
+
+def test_httpcore_logger_info_not_enabled():
+    """httpcore logger must not propagate INFO-level messages (would leak BOT_TOKEN URL)."""
+    import backend.main  # noqa: F401
+
+    httpcore_logger = logging.getLogger("httpcore")
+    assert not httpcore_logger.isEnabledFor(logging.INFO), (
+        "httpcore logger must not process INFO messages — could leak BOT_TOKEN via URL"
+    )
+
+
+# ---------------------------------------------------------------------------
+# validate_bot_token() exception handler — AC#4: no raw token in error logs
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_network_error_does_not_log_raw_token(caplog):
+    """validate_bot_token() on ConnectError must NOT log the raw BOT_TOKEN.
+
+    AC#4: The exception handler logs type(exc).__name__ + _mask_token() instead
+    of raw exc, which embeds the Telegram API URL containing the token.
+    """
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(side_effect=httpx.ConnectError("connection refused"))
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            result = await validate_bot_token()
+
+    assert result is False
+
+    raw_token = config.BOT_TOKEN
+    for record in caplog.records:
+        assert raw_token not in record.message, (
+            f"AC#4: Raw BOT_TOKEN leaked in log message: {record.message!r}"
+        )
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_network_error_logs_exception_type_name(caplog):
+    """validate_bot_token() on ConnectError logs the exception type name, not repr(exc).
+
+    The fixed handler: logger.error('...%s...', type(exc).__name__, ...) — not str(exc).
+    """
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(side_effect=httpx.ConnectError("connection refused"))
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            await validate_bot_token()
+
+    error_messages = [r.message for r in caplog.records if r.levelno >= logging.ERROR]
+    assert error_messages, "Expected at least one ERROR log on network failure"
+    assert any("ConnectError" in msg for msg in error_messages), (
+        f"Expected 'ConnectError' (type name) in error log, got: {error_messages}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_network_error_logs_masked_token(caplog):
+    """validate_bot_token() on network error logs masked token (***XXXX), not raw token."""
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(side_effect=httpx.ConnectError("connection refused"))
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            await validate_bot_token()
+
+    token = config.BOT_TOKEN  # "test-bot-token"
+    masked = f"***{token[-4:]}"  # "***oken"
+    error_messages = [r.message for r in caplog.records if r.levelno >= logging.ERROR]
+    assert any(masked in msg for msg in error_messages), (
+        f"Expected masked token '{masked}' in error log. Got: {error_messages}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_network_error_no_api_url_in_logs(caplog):
+    """validate_bot_token() on network error must not log the Telegram API URL.
+
+    httpx embeds the request URL (including the token) into exception repr/str.
+    The fixed handler avoids logging exc directly to prevent this leak.
+    """
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(side_effect=httpx.ConnectError("connection refused"))
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            await validate_bot_token()
+
+    for record in caplog.records:
+        assert "api.telegram.org" not in record.message, (
+            f"AC#4: Telegram API URL (containing token) leaked in log: {record.message!r}"
+        )
diff --git a/tests/test_fix_009.py b/tests/test_fix_009.py
new file mode 100644
index 0000000..399e4aa
--- /dev/null
+++ b/tests/test_fix_009.py
@@ -0,0 +1,229 @@
+"""
+Tests for BATON-FIX-009: Live delivery verification — automated regression guards.
+
+Acceptance criteria mapped to unit tests:
+  AC#3 — BOT_TOKEN validates on startup via validate_bot_token() (getMe call)
+  AC#4 — CHAT_ID is negative (regression guard for decision #1212)
+  AC#1 — POST /api/signal returns 200 with valid auth
+
+Physical production checks (AC#2 Telegram group message, AC#5 systemd status)
+are outside unit test scope and require live production verification.
+"""
+from __future__ import annotations
+
+import logging
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import json
+from unittest.mock import AsyncMock, patch
+
+import httpx
+import pytest
+import respx
+
+from tests.conftest import make_app_client, temp_db
+
+
+# ---------------------------------------------------------------------------
+# AC#3 — validate_bot_token called at startup (decision #1211)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_called_once_during_startup():
+    """AC#3: validate_bot_token() must be called exactly once during app startup.
+
+    Maps to production check: curl getMe must be executed to detect invalid token
+    before the service starts accepting signals (decision #1211).
+    """
+    from backend.main import app
+
+    with temp_db():
+        with patch("backend.telegram.validate_bot_token", new_callable=AsyncMock) as mock_validate:
+            mock_validate.return_value = True
+            with patch("backend.telegram.set_webhook", new_callable=AsyncMock):
+                async with app.router.lifespan_context(app):
+                    pass
+
+    assert mock_validate.call_count == 1, (
+        f"Expected validate_bot_token to be called exactly once at startup, "
+        f"got {mock_validate.call_count}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_invalid_bot_token_logs_critical_error_on_startup(caplog):
+    """AC#3: When BOT_TOKEN is invalid (validate_bot_token returns False),
+    a CRITICAL/ERROR is logged but lifespan continues — service must not crash.
+
+    Maps to: 'Check BOT_TOKEN valid via getMe — status OK/FAIL' (decision #1211).
+    """
+    from backend.main import app
+
+    with temp_db():
+        with patch("backend.telegram.validate_bot_token", new_callable=AsyncMock) as mock_validate:
+            mock_validate.return_value = False
+            with patch("backend.telegram.set_webhook", new_callable=AsyncMock):
+                with caplog.at_level(logging.ERROR, logger="backend.main"):
+                    async with app.router.lifespan_context(app):
+                        pass  # lifespan must complete without raising
+
+    critical_msgs = [r.message for r in caplog.records if r.levelno >= logging.ERROR]
+    assert len(critical_msgs) >= 1, (
+        "Expected at least one ERROR/CRITICAL log when BOT_TOKEN is invalid. "
+        "Operator must be alerted on startup if Telegram delivery is broken."
+    )
+    assert any("BOT_TOKEN" in m for m in critical_msgs), (
+        f"Expected log mentioning 'BOT_TOKEN', got: {critical_msgs}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_invalid_bot_token_lifespan_does_not_raise():
+    """AC#3: Invalid BOT_TOKEN must not crash the service — lifespan completes normally."""
+    from backend.main import app
+
+    with temp_db():
+        with patch("backend.telegram.validate_bot_token", new_callable=AsyncMock) as mock_validate:
+            mock_validate.return_value = False
+            with patch("backend.telegram.set_webhook", new_callable=AsyncMock):
+                # Must not raise — service stays alive even with broken Telegram token
+                async with app.router.lifespan_context(app):
+                    pass
+
+
+# ---------------------------------------------------------------------------
+# AC#4 — CHAT_ID is negative (decision #1212 regression guard)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_send_message_chat_id_in_request_is_negative():
+    """AC#4: The chat_id sent to Telegram API must be negative (group ID).
+
+    Root cause of BATON-007: CHAT_ID=5190015988 (positive) was set in .env
+    instead of -5190015988 (negative). Negative ID = Telegram group/supergroup.
+    Decision #1212: CHAT_ID=-5190015988 отрицательный.
+    """
+    from backend import config
+    from backend.telegram import send_message
+
+    send_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
+
+    with respx.mock(assert_all_called=False) as mock:
+        route = mock.post(send_url).mock(
+            return_value=httpx.Response(200, json={"ok": True})
+        )
+        await send_message("AC#4 regression guard")
+
+    assert route.called
+    body = json.loads(route.calls[0].request.content)
+    chat_id = body["chat_id"]
+    assert str(chat_id).startswith("-"), (
+        f"Regression #1212: chat_id must be negative (group ID), got {chat_id!r}. "
+        "Positive chat_id is a user ID — messages go to private DM, not the group."
+    )
+
+
+# ---------------------------------------------------------------------------
+# AC#1 — POST /api/signal returns 200 (decision #1211)
+# ---------------------------------------------------------------------------
+
+
+_UUID_FIX009 = "f0090001-0000-4000-8000-000000000001"
+
+
+@pytest.mark.asyncio
+async def test_signal_endpoint_returns_200_with_valid_auth():
+    """AC#1: POST /api/signal with valid Bearer token must return HTTP 200.
+
+    Maps to production check: 'SSH на сервер, отправить POST /api/signal,
+    зафиксировать raw ответ API' (decision #1211).
+    """
+    async with make_app_client() as client:
+        reg = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_FIX009, "name": "Fix009User"},
+        )
+        assert reg.status_code == 200, f"Registration failed: {reg.text}"
+        api_key = reg.json()["api_key"]
+
+        resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_FIX009, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+
+    assert resp.status_code == 200, (
+        f"Expected /api/signal to return 200, got {resp.status_code}: {resp.text}"
+    )
+    body = resp.json()
+    assert body.get("status") == "ok", f"Expected status='ok', got: {body}"
+    assert "signal_id" in body, f"Expected signal_id in response, got: {body}"
+
+
+@pytest.mark.asyncio
+async def test_signal_endpoint_returns_200_even_when_telegram_returns_400(caplog):
+    """AC#1 + decision #1230: POST /api/signal must return 200 even if Telegram returns 400.
+
+    Decision #1230: 'Если Telegram возвращает 400 — зафиксировать и сообщить'.
+    The HTTP 400 from Telegram must be logged as ERROR (captured/reported),
+    but /api/signal must still return 200 — signal was saved to DB.
+    """
+    from backend import config
+    from backend.main import app
+
+    send_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
+    set_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"
+    get_me_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/getMe"
+
+    _UUID_400 = "f0090002-0000-4000-8000-000000000002"
+
+    with temp_db():
+        with respx.mock(assert_all_called=False) as mock_tg:
+            mock_tg.get(get_me_url).mock(
+                return_value=httpx.Response(200, json={"ok": True, "result": {"username": "testbot"}})
+            )
+            mock_tg.post(set_url).mock(
+                return_value=httpx.Response(200, json={"ok": True, "result": True})
+            )
+            mock_tg.post(send_url).mock(
+                return_value=httpx.Response(
+                    400,
+                    json={"ok": False, "error_code": 400, "description": "Bad Request: chat not found"},
+                )
+            )
+
+            async with app.router.lifespan_context(app):
+                import asyncio
+                from httpx import AsyncClient, ASGITransport
+
+                transport = ASGITransport(app=app)
+                async with AsyncClient(transport=transport, base_url="http://testserver") as client:
+                    reg = await client.post("/api/register", json={"uuid": _UUID_400, "name": "TgErrUser"})
+                    assert reg.status_code == 200
+                    api_key = reg.json()["api_key"]
+
+                    with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+                        resp = await client.post(
+                            "/api/signal",
+                            json={"user_id": _UUID_400, "timestamp": 1742478000000},
+                            headers={"Authorization": f"Bearer {api_key}"},
+                        )
+                        await asyncio.sleep(0)
+
+    assert resp.status_code == 200, (
+        f"Decision #1230: /api/signal must return 200 even on Telegram 400, "
+        f"got {resp.status_code}"
+    )
+    assert any("400" in r.message for r in caplog.records), (
+        "Decision #1230: Telegram 400 error must be logged (captured and reported). "
+        "Got logs: " + str([r.message for r in caplog.records])
+    )
diff --git a/tests/test_fix_011.py b/tests/test_fix_011.py
new file mode 100644
index 0000000..f4a3019
--- /dev/null
+++ b/tests/test_fix_011.py
@@ -0,0 +1,116 @@
+"""
+BATON-FIX-011: Проверяет, что BOT_TOKEN не попадает в httpx-логи.
+
+1. logging.getLogger('httpx').level >= logging.WARNING после импорта приложения.
+2. Дочерние логгеры httpx._client и httpx._async_client также не пишут INFO.
+3. При вызове send_message ни одна запись httpx-логгера с уровнем INFO
+   не содержит 'bot' или токен-подобный паттерн /bot[0-9]+:/.
+"""
+from __future__ import annotations
+
+import logging
+import re
+
+import httpx
+import pytest
+import respx
+from unittest.mock import patch, AsyncMock
+
+# conftest.py уже устанавливает BOT_TOKEN=test-bot-token до этого импорта
+from backend import config
+from backend.telegram import send_message
+
+SEND_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
+BOT_TOKEN_PATTERN = re.compile(r"bot[0-9]+:")
+
+
+# ---------------------------------------------------------------------------
+# Уровень логгера httpx
+# ---------------------------------------------------------------------------
+
+def test_httpx_logger_level_is_warning_or_higher():
+    """logging.getLogger('httpx').level должен быть WARNING (30) или выше после импорта приложения."""
+    # Импортируем main, чтобы гарантировать, что setLevel уже вызван
+    import backend.main  # noqa: F401
+
+    httpx_logger = logging.getLogger("httpx")
+    assert httpx_logger.level >= logging.WARNING, (
+        f"Ожидался уровень >= WARNING (30), получен {httpx_logger.level}"
+    )
+
+
+def test_httpx_logger_info_not_enabled():
+    """logging.getLogger('httpx').isEnabledFor(INFO) должен возвращать False."""
+    import backend.main  # noqa: F401
+
+    httpx_logger = logging.getLogger("httpx")
+    assert not httpx_logger.isEnabledFor(logging.INFO), (
+        "httpx-логгер не должен обрабатывать INFO-сообщения"
+    )
+
+
+def test_httpx_client_logger_info_not_enabled():
+    """Дочерний логгер httpx._client не должен обрабатывать INFO."""
+    import backend.main  # noqa: F401
+
+    child_logger = logging.getLogger("httpx._client")
+    assert not child_logger.isEnabledFor(logging.INFO), (
+        "httpx._client не должен обрабатывать INFO-сообщения"
+    )
+
+
+def test_httpx_async_client_logger_info_not_enabled():
+    """Дочерний логгер httpx._async_client не должен обрабатывать INFO."""
+    import backend.main  # noqa: F401
+
+    child_logger = logging.getLogger("httpx._async_client")
+    assert not child_logger.isEnabledFor(logging.INFO), (
+        "httpx._async_client не должен обрабатывать INFO-сообщения"
+    )
+
+
+# ---------------------------------------------------------------------------
+# BOT_TOKEN не появляется в httpx INFO-логах при send_message
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_send_message_no_httpx_records_at_warning_level(caplog):
+    """При вызове send_message httpx не выдаёт записей уровня WARNING и ниже с токеном.
+
+    Проверяет фактическое состояние логгера в продакшне (WARNING): INFO-сообщения
+    с URL (включая BOT_TOKEN) не должны проходить через httpx-логгер.
+    """
+    import backend.main  # noqa: F401 — убеждаемся, что setLevel вызван
+
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(return_value=httpx.Response(200, json={"ok": True}))
+
+        # Захватываем логи при реальном уровне WARNING — INFO-сообщения не должны проходить
+        with caplog.at_level(logging.WARNING, logger="httpx"):
+            await send_message("test message for token leak check")
+
+    bot_token = config.BOT_TOKEN
+    httpx_records = [r for r in caplog.records if r.name.startswith("httpx")]
+    for record in httpx_records:
+        assert bot_token not in record.message, (
+            f"BOT_TOKEN найден в httpx-логе (уровень {record.levelname}): {record.message!r}"
+        )
+
+
+@pytest.mark.asyncio
+async def test_send_message_no_token_pattern_in_httpx_info_logs(caplog):
+    """При вызове send_message httpx INFO-логи не содержат паттерн /bot[0-9]+:/."""
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(return_value=httpx.Response(200, json={"ok": True}))
+
+        with caplog.at_level(logging.INFO, logger="httpx"):
+            await send_message("check token pattern")
+
+    info_records = [
+        r for r in caplog.records
+        if r.name.startswith("httpx") and r.levelno <= logging.INFO
+    ]
+    for record in info_records:
+        assert not BOT_TOKEN_PATTERN.search(record.message), (
+            f"Паттерн bot[0-9]+: найден в httpx INFO-логе: {record.message!r}"
+        )
diff --git a/tests/test_fix_012.py b/tests/test_fix_012.py
new file mode 100644
index 0000000..64356de
--- /dev/null
+++ b/tests/test_fix_012.py
@@ -0,0 +1,173 @@
+"""
+Tests for BATON-FIX-012: UUID v4 validation regression guard.
+
+BATON-SEC-005 added UUID v4 pattern validation to RegisterRequest.uuid and
+SignalRequest.user_id.  Tests in test_db.py / test_baton_005.py / test_telegram.py
+previously used placeholder strings ('uuid-001', 'create-uuid-001', 'agg-uuid-001')
+that are not valid UUID v4 — causing 25 regressions.
+
+This file locks down the behaviour so the same mistake cannot recur silently:
+  - Old-style placeholder strings are rejected by Pydantic
+  - All UUID constants used across the fixed test files are valid UUID v4
+  - RegisterRequest and SignalRequest accept exactly-valid v4 UUIDs
+  - They reject strings that violate version (bit 3 of field-3 must be 4) or
+    variant (top bits of field-4 must be 10xx) requirements
+"""
+from __future__ import annotations
+
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import pytest
+from pydantic import ValidationError
+
+from backend.models import RegisterRequest, SignalRequest
+
+# ---------------------------------------------------------------------------
+# UUID constants from fixed test files — all must be valid UUID v4
+# ---------------------------------------------------------------------------
+
+# test_db.py constants (_UUID_DB_1 .. _UUID_DB_6)
+_DB_UUIDS = [
+    "d0000001-0000-4000-8000-000000000001",
+    "d0000002-0000-4000-8000-000000000002",
+    "d0000003-0000-4000-8000-000000000003",
+    "d0000004-0000-4000-8000-000000000004",
+    "d0000005-0000-4000-8000-000000000005",
+    "d0000006-0000-4000-8000-000000000006",
+]
+
+# test_baton_005.py constants (_UUID_ADM_*)
+_ADM_UUIDS = [
+    "e0000000-0000-4000-8000-000000000000",
+    "e0000001-0000-4000-8000-000000000001",
+    "e0000002-0000-4000-8000-000000000002",
+    "e0000003-0000-4000-8000-000000000003",
+    "e0000004-0000-4000-8000-000000000004",
+    "e0000005-0000-4000-8000-000000000005",
+    "e0000006-0000-4000-8000-000000000006",
+    "e0000007-0000-4000-8000-000000000007",
+    "e0000008-0000-4000-8000-000000000008",
+    "e0000009-0000-4000-8000-000000000009",
+    "e000000a-0000-4000-8000-000000000010",
+]
+
+# test_telegram.py constants (aggregator UUIDs)
+_AGG_UUIDS = [
+    "a9900001-0000-4000-8000-000000000001",
+    "a9900099-0000-4000-8000-000000000099",
+] + [f"a990000{i}-0000-4000-8000-00000000000{i}" for i in range(5)]
+
+
+# ---------------------------------------------------------------------------
+# Old-style placeholder UUIDs (pre-fix) must be rejected
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.parametrize("bad_uuid", [
+    "uuid-001",
+    "uuid-002",
+    "uuid-003",
+    "uuid-004",
+    "uuid-005",
+    "uuid-006",
+    "create-uuid-001",
+    "create-uuid-002",
+    "create-uuid-003",
+    "pass-uuid-001",
+    "pass-uuid-002",
+    "block-uuid-001",
+    "unblock-uuid-001",
+    "delete-uuid-001",
+    "delete-uuid-002",
+    "regress-admin-uuid-001",
+    "unauth-uuid-001",
+    "agg-uuid-001",
+    "agg-uuid-clr",
+])
+def test_register_request_rejects_old_placeholder_uuid(bad_uuid: str) -> None:
+    """RegisterRequest.uuid must reject all pre-BATON-SEC-005 placeholder strings."""
+    with pytest.raises(ValidationError):
+        RegisterRequest(uuid=bad_uuid, name="Test")
+
+
+@pytest.mark.parametrize("bad_uuid", [
+    "uuid-001",
+    "agg-uuid-001",
+    "create-uuid-001",
+])
+def test_signal_request_rejects_old_placeholder_uuid(bad_uuid: str) -> None:
+    """SignalRequest.user_id must reject old-style placeholder strings."""
+    with pytest.raises(ValidationError):
+        SignalRequest(user_id=bad_uuid, timestamp=1700000000000)
+
+
+# ---------------------------------------------------------------------------
+# All UUID constants from the fixed test files are valid UUID v4
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.parametrize("valid_uuid", _DB_UUIDS)
+def test_register_request_accepts_db_uuid_constants(valid_uuid: str) -> None:
+    """RegisterRequest accepts all _UUID_DB_* constants from test_db.py."""
+    req = RegisterRequest(uuid=valid_uuid, name="Test")
+    assert req.uuid == valid_uuid
+
+
+@pytest.mark.parametrize("valid_uuid", _ADM_UUIDS)
+def test_register_request_accepts_adm_uuid_constants(valid_uuid: str) -> None:
+    """RegisterRequest accepts all _UUID_ADM_* constants from test_baton_005.py."""
+    req = RegisterRequest(uuid=valid_uuid, name="Test")
+    assert req.uuid == valid_uuid
+
+
+@pytest.mark.parametrize("valid_uuid", _AGG_UUIDS)
+def test_signal_request_accepts_agg_uuid_constants(valid_uuid: str) -> None:
+    """SignalRequest accepts all aggregator UUID constants from test_telegram.py."""
+    req = SignalRequest(user_id=valid_uuid, timestamp=1700000000000)
+    assert req.user_id == valid_uuid
+
+
+# ---------------------------------------------------------------------------
+# UUID v4 structural requirements — version digit and variant bits
+# ---------------------------------------------------------------------------
+
+
+def test_register_request_rejects_uuid_v1_version_digit() -> None:
+    """UUID with version digit = 1 (not 4) must be rejected by RegisterRequest."""
+    with pytest.raises(ValidationError):
+        # third group starts with '1' — version 1, not v4
+        RegisterRequest(uuid="550e8400-e29b-11d4-a716-446655440000", name="Test")
+
+
+def test_register_request_rejects_uuid_v3_version_digit() -> None:
+    """UUID with version digit = 3 must be rejected."""
+    with pytest.raises(ValidationError):
+        RegisterRequest(uuid="550e8400-e29b-31d4-a716-446655440000", name="Test")
+
+
+def test_signal_request_rejects_uuid_wrong_variant_bits() -> None:
+    """UUID with invalid variant bits (0xxx in fourth group) must be rejected."""
+    with pytest.raises(ValidationError):
+        # fourth group starts with '0' — not 8/9/a/b variant
+        SignalRequest(user_id="550e8400-e29b-41d4-0716-446655440000", timestamp=1700000000000)
+
+
+def test_signal_request_rejects_uuid_wrong_variant_c() -> None:
+    """UUID with variant 'c' (1100 bits) must be rejected — only 8/9/a/b allowed."""
+    with pytest.raises(ValidationError):
+        SignalRequest(user_id="550e8400-e29b-41d4-c716-446655440000", timestamp=1700000000000)
+
+
+def test_register_request_accepts_all_valid_v4_variants() -> None:
+    """RegisterRequest accepts UUIDs with variant nibbles 8, 9, a, b."""
+    for variant in ("8", "9", "a", "b"):
+        uuid = f"550e8400-e29b-41d4-{variant}716-446655440000"
+        req = RegisterRequest(uuid=uuid, name="Test")
+        assert req.uuid == uuid
diff --git a/tests/test_telegram.py b/tests/test_telegram.py
index c55a6a0..e1467a0 100644
--- a/tests/test_telegram.py
+++ b/tests/test_telegram.py
@@ -218,7 +218,7 @@ async def test_aggregator_single_signal_calls_send_message():
     try:
         agg = SignalAggregator(interval=9999)
         await agg.add_signal(
-            user_uuid="agg-uuid-001",
+            user_uuid="a9900001-0000-4000-8000-000000000001",
             user_name="Alice",
             timestamp=1742478000000,
             geo={"lat": 55.0, "lon": 37.0, "accuracy": 10.0},
@@ -246,7 +246,7 @@ async def test_aggregator_multiple_signals_one_message():
         agg = SignalAggregator(interval=9999)
         for i in range(5):
             await agg.add_signal(
-                user_uuid=f"agg-uuid-{i:03d}",
+                user_uuid=f"a990000{i}-0000-4000-8000-00000000000{i}",
                 user_name=f"User{i}",
                 timestamp=1742478000000 + i * 1000,
                 geo=None,
@@ -288,7 +288,7 @@ async def test_aggregator_buffer_cleared_after_flush():
     try:
         agg = SignalAggregator(interval=9999)
         await agg.add_signal(
-            user_uuid="agg-uuid-clr",
+            user_uuid="a9900099-0000-4000-8000-000000000099",
             user_name="Test",
             timestamp=1742478000000,
             geo=None,