diff --git a/.env.example b/.env.example
index cf447e0..6d8ac36 100644
--- a/.env.example
+++ b/.env.example
@@ -11,3 +11,8 @@ DB_PATH=baton.db
 
 # CORS
 FRONTEND_ORIGIN=https://yourdomain.com
+
+# VAPID Push Notifications (generate with: python -c "from py_vapid import Vapid; v=Vapid(); v.generate_keys(); print(v.public_key, v.private_key)")
+VAPID_PUBLIC_KEY=
+VAPID_PRIVATE_KEY=
+VAPID_CLAIMS_EMAIL=
diff --git a/backend/config.py b/backend/config.py
index 7535cc0..305d05e 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -26,3 +26,5 @@ ADMIN_CHAT_ID: str = _require("ADMIN_CHAT_ID")
 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", "")
+JWT_SECRET: str = os.getenv("JWT_SECRET", "")
+JWT_TOKEN_EXPIRE_SECONDS: int = int(os.getenv("JWT_TOKEN_EXPIRE_SECONDS", "2592000"))  # 30 days
diff --git a/backend/db.py b/backend/db.py
index d733006..5e2541c 100644
--- a/backend/db.py
+++ b/backend/db.py
@@ -352,6 +352,30 @@ async def update_registration_status(reg_id: int, status: str) -> bool:
     return changed
 
 
+async def get_registration_by_login_or_email(login_or_email: str) -> Optional[dict]:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            """
+            SELECT id, email, login, password_hash, status, push_subscription, created_at
+            FROM registrations
+            WHERE login = ? OR email = ?
+            """,
+            (login_or_email, login_or_email),
+        ) as cur:
+            row = await cur.fetchone()
+    if row is None:
+        return None
+    return {
+        "id": row["id"],
+        "email": row["email"],
+        "login": row["login"],
+        "password_hash": row["password_hash"],
+        "status": row["status"],
+        "push_subscription": row["push_subscription"],
+        "created_at": row["created_at"],
+    }
+
+
 async def save_telegram_batch(
     message_text: str,
     signals_count: int,
diff --git a/backend/main.py b/backend/main.py
index 7f17501..d064b40 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import asyncio
 import hashlib
+import hmac
 import logging
 import os
 import secrets
@@ -16,11 +17,21 @@ from fastapi.responses import JSONResponse
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
 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.middleware import (
+    create_auth_token,
+    rate_limit_auth_login,
+    rate_limit_auth_register,
+    rate_limit_register,
+    rate_limit_signal,
+    verify_admin_token,
+    verify_webhook_secret,
+)
 from backend.models import (
     AdminBlockRequest,
     AdminCreateUserRequest,
     AdminSetPasswordRequest,
+    AuthLoginRequest,
+    AuthLoginResponse,
     AuthRegisterRequest,
     AuthRegisterResponse,
     RegisterRequest,
@@ -51,6 +62,18 @@ def _hash_password(password: str) -> str:
     dk = hashlib.pbkdf2_hmac("sha256", password.encode("utf-8"), salt, 260_000)
     return f"{salt.hex()}:{dk.hex()}"
 
+def _verify_password(password: str, stored_hash: str) -> bool:
+    """Verify a password against a stored PBKDF2-HMAC-SHA256 hash (salt_hex:dk_hex)."""
+    try:
+        salt_hex, dk_hex = stored_hash.split(":", 1)
+        salt = bytes.fromhex(salt_hex)
+        expected_dk = bytes.fromhex(dk_hex)
+        actual_dk = hashlib.pbkdf2_hmac("sha256", password.encode("utf-8"), salt, 260_000)
+        return hmac.compare_digest(actual_dk, expected_dk)
+    except Exception:
+        return False
+
+
 # aggregator = telegram.SignalAggregator(interval=10)  # v2.0 feature — отключено в v1 (ADR-004)
 
 _KEEPALIVE_INTERVAL = 600  # 10 минут
@@ -132,6 +155,12 @@ async def health() -> dict[str, Any]:
     return {"status": "ok"}
 
 
+@app.get("/api/vapid-public-key")
+@app.get("/api/push/public-key")
+async def vapid_public_key() -> dict[str, str]:
+    return {"vapid_public_key": config.VAPID_PUBLIC_KEY}
+
+
 @app.post("/api/register", response_model=RegisterResponse)
 async def register(body: RegisterRequest, _: None = Depends(rate_limit_register)) -> RegisterResponse:
     api_key = secrets.token_hex(32)
@@ -219,6 +248,24 @@ async def auth_register(
     return AuthRegisterResponse(status="pending", message="Заявка отправлена на рассмотрение")
 
 
+@app.post("/api/auth/login", response_model=AuthLoginResponse)
+async def auth_login(
+    body: AuthLoginRequest,
+    _: None = Depends(rate_limit_auth_login),
+) -> AuthLoginResponse:
+    reg = await db.get_registration_by_login_or_email(body.login_or_email)
+    if reg is None or not _verify_password(body.password, reg["password_hash"]):
+        raise HTTPException(status_code=401, detail="Неверный логин или пароль")
+    if reg["status"] == "pending":
+        raise HTTPException(status_code=403, detail="Ваша заявка ожидает рассмотрения")
+    if reg["status"] == "rejected":
+        raise HTTPException(status_code=403, detail="Ваша заявка отклонена")
+    if reg["status"] != "approved":
+        raise HTTPException(status_code=403, detail="Доступ запрещён")
+    token = create_auth_token(reg["id"], reg["login"])
+    return AuthLoginResponse(token=token, login=reg["login"])
+
+
 async def _handle_callback_query(cb: dict) -> None:
     """Process approve/reject callback from admin Telegram inline buttons."""
     data = cb.get("data", "")
diff --git a/backend/middleware.py b/backend/middleware.py
index 1d183a9..27f1fd3 100644
--- a/backend/middleware.py
+++ b/backend/middleware.py
@@ -1,6 +1,11 @@
 from __future__ import annotations
 
+import base64
+import hashlib
+import hmac
+import json
 import secrets
+import time
 from typing import Optional
 
 from fastapi import Depends, Header, HTTPException, Request
@@ -8,6 +13,12 @@ from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
 from backend import config, db
 
+# JWT secret: stable across restarts if JWT_SECRET env var is set; random per-process otherwise
+_JWT_SECRET: str = config.JWT_SECRET or secrets.token_hex(32)
+_JWT_HEADER_B64: str = (
+    base64.urlsafe_b64encode(b'{"alg":"HS256","typ":"JWT"}').rstrip(b"=").decode()
+)
+
 _bearer = HTTPBearer(auto_error=False)
 
 _RATE_LIMIT = 5
@@ -65,3 +76,74 @@ async def rate_limit_auth_register(request: Request) -> None:
     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")
+
+
+_AUTH_LOGIN_RATE_LIMIT = 5
+_AUTH_LOGIN_RATE_WINDOW = 900  # 15 minutes
+
+
+def _b64url_encode(data: bytes) -> str:
+    return base64.urlsafe_b64encode(data).rstrip(b"=").decode()
+
+
+def _b64url_decode(s: str) -> bytes:
+    padding = 4 - len(s) % 4
+    if padding != 4:
+        s += "=" * padding
+    return base64.urlsafe_b64decode(s)
+
+
+def create_auth_token(reg_id: int, login: str) -> str:
+    """Create a signed HS256 JWT for an approved registration."""
+    now = int(time.time())
+    payload = {
+        "sub": str(reg_id),
+        "login": login,
+        "iat": now,
+        "exp": now + config.JWT_TOKEN_EXPIRE_SECONDS,
+    }
+    payload_b64 = _b64url_encode(json.dumps(payload, separators=(",", ":")).encode())
+    signing_input = f"{_JWT_HEADER_B64}.{payload_b64}"
+    sig = hmac.new(
+        _JWT_SECRET.encode(), signing_input.encode(), hashlib.sha256
+    ).digest()
+    return f"{signing_input}.{_b64url_encode(sig)}"
+
+
+def _verify_jwt_token(token: str) -> dict:
+    """Verify token signature and expiry. Returns payload dict on success."""
+    parts = token.split(".")
+    if len(parts) != 3:
+        raise ValueError("Invalid token format")
+    header_b64, payload_b64, sig_b64 = parts
+    signing_input = f"{header_b64}.{payload_b64}"
+    expected_sig = hmac.new(
+        _JWT_SECRET.encode(), signing_input.encode(), hashlib.sha256
+    ).digest()
+    actual_sig = _b64url_decode(sig_b64)
+    if not hmac.compare_digest(expected_sig, actual_sig):
+        raise ValueError("Invalid signature")
+    payload = json.loads(_b64url_decode(payload_b64))
+    if payload.get("exp", 0) < time.time():
+        raise ValueError("Token expired")
+    return payload
+
+
+async def rate_limit_auth_login(request: Request) -> None:
+    key = f"login:{_get_client_ip(request)}"
+    count = await db.rate_limit_increment(key, _AUTH_LOGIN_RATE_WINDOW)
+    if count > _AUTH_LOGIN_RATE_LIMIT:
+        raise HTTPException(status_code=429, detail="Too Many Requests")
+
+
+async def verify_auth_token(
+    credentials: Optional[HTTPAuthorizationCredentials] = Depends(_bearer),
+) -> dict:
+    """Dependency for protected endpoints — verifies Bearer JWT, returns payload."""
+    if credentials is None:
+        raise HTTPException(status_code=401, detail="Unauthorized")
+    try:
+        payload = _verify_jwt_token(credentials.credentials)
+    except Exception:
+        raise HTTPException(status_code=401, detail="Unauthorized")
+    return payload
diff --git a/backend/models.py b/backend/models.py
index 065d0c8..b3d847a 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -66,3 +66,13 @@ class AuthRegisterRequest(BaseModel):
 class AuthRegisterResponse(BaseModel):
     status: str
     message: str
+
+
+class AuthLoginRequest(BaseModel):
+    login_or_email: str = Field(..., min_length=1, max_length=255)
+    password: str = Field(..., min_length=1, max_length=128)
+
+
+class AuthLoginResponse(BaseModel):
+    token: str
+    login: str
diff --git a/backend/telegram.py b/backend/telegram.py
index 4b37a7e..db604f5 100644
--- a/backend/telegram.py
+++ b/backend/telegram.py
@@ -11,11 +11,6 @@ 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}"
 
 
@@ -148,76 +143,3 @@ async def set_webhook(url: str, secret: str) -> None:
         raise RuntimeError(f"setWebhook failed: {resp.text}")
     logger.info("Webhook registered: %s", url)
 
-
-# v2.0 feature
-class SignalAggregator:
-    def __init__(self, interval: int = 10) -> None:
-        self._interval = interval
-        self._buffer: list[dict] = []
-        self._lock = asyncio.Lock()
-        self._stopped = False
-
-    async def add_signal(
-        self,
-        user_uuid: str,
-        user_name: Optional[str],
-        timestamp: int,
-        geo: Optional[dict],
-        signal_id: int,
-    ) -> None:
-        async with self._lock:
-            self._buffer.append(
-                {
-                    "user_uuid": user_uuid,
-                    "user_name": user_name,
-                    "timestamp": timestamp,
-                    "geo": geo,
-                    "signal_id": signal_id,
-                }
-            )
-
-    async def flush(self) -> None:
-        async with self._lock:
-            if not self._buffer:
-                return
-            items = self._buffer[:]
-            self._buffer.clear()
-
-        signal_ids = [item["signal_id"] for item in items]
-        timestamps = [item["timestamp"] for item in items]
-        ts_start = datetime.fromtimestamp(min(timestamps) / 1000, tz=timezone.utc)
-        ts_end = datetime.fromtimestamp(max(timestamps) / 1000, tz=timezone.utc)
-        t_fmt = "%H:%M:%S"
-
-        names = []
-        for item in items:
-            name = item["user_name"]
-            label = name if name else item["user_uuid"][:8]
-            names.append(label)
-
-        geo_count = sum(1 for item in items if item["geo"])
-        n = len(items)
-
-        text = (
-            f"\U0001f6a8 Получено {n} сигнал{'ов' if n != 1 else ''} "
-            f"[{ts_start.strftime(t_fmt)}—{ts_end.strftime(t_fmt)}]\n"
-            f"Пользователи: {', '.join(names)}\n"
-            f"\U0001f4cd С геолокацией: {geo_count} из {n}"
-        )
-
-        try:
-            await send_message(text)
-            await db.save_telegram_batch(text, n, signal_ids)
-            # rate-limit: 1 msg/sec max (#1014)
-            await asyncio.sleep(1)
-        except Exception:
-            logger.exception("Failed to flush aggregator batch")
-
-    async def run(self) -> None:
-        while not self._stopped:
-            await asyncio.sleep(self._interval)
-            if self._buffer:
-                await self.flush()
-
-    def stop(self) -> None:
-        self._stopped = True
diff --git a/frontend/app.js b/frontend/app.js
index e457ee7..de54b6f 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -92,6 +92,21 @@ function _setStatus(msg, cls) {
   el.hidden = !msg;
 }
 
+function _setRegStatus(msg, cls) {
+  const el = document.getElementById('reg-status');
+  if (!el) return;
+  el.textContent = msg;
+  el.className = 'reg-status' + (cls ? ' reg-status--' + cls : '');
+  el.hidden = !msg;
+}
+
+function _showView(id) {
+  ['view-login', 'view-register'].forEach((vid) => {
+    const el = document.getElementById(vid);
+    if (el) el.hidden = vid !== id;
+  });
+}
+
 function _updateNetworkIndicator() {
   const el = document.getElementById('indicator-network');
   if (!el) return;
@@ -210,6 +225,7 @@ async function _handleSignal() {
 
 function _showOnboarding() {
   _showScreen('screen-onboarding');
+  _showView('view-login');
 
   const input = document.getElementById('name-input');
   const btn = document.getElementById('btn-confirm');
@@ -221,6 +237,24 @@ function _showOnboarding() {
     if (e.key === 'Enter' && !btn.disabled) _handleRegister();
   });
   btn.addEventListener('click', _handleRegister);
+
+  const btnToRegister = document.getElementById('btn-switch-to-register');
+  if (btnToRegister) {
+    btnToRegister.addEventListener('click', () => {
+      _setRegStatus('', '');
+      _showView('view-register');
+    });
+  }
+
+  const btnToLogin = document.getElementById('btn-switch-to-login');
+  if (btnToLogin) {
+    btnToLogin.addEventListener('click', () => _showView('view-login'));
+  }
+
+  const btnRegister = document.getElementById('btn-register');
+  if (btnRegister) {
+    btnRegister.addEventListener('click', _handleSignUp);
+  }
 }
 
 function _showMain() {
@@ -243,6 +277,127 @@ function _registerSW() {
   });
 }
 
+// ========== VAPID / Push subscription ==========
+
+async function _fetchVapidPublicKey() {
+  try {
+    const res = await fetch('/api/push/public-key');
+    if (!res.ok) {
+      console.warn('[baton] /api/push/public-key returned', res.status);
+      return null;
+    }
+    const data = await res.json();
+    return data.vapid_public_key || null;
+  } catch (err) {
+    console.warn('[baton] Failed to fetch VAPID public key:', err);
+    return null;
+  }
+}
+
+function _urlBase64ToUint8Array(base64String) {
+  const padding = '='.repeat((4 - (base64String.length % 4)) % 4);
+  const base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/');
+  const raw = atob(base64);
+  const output = new Uint8Array(raw.length);
+  for (let i = 0; i < raw.length; i++) {
+    output[i] = raw.charCodeAt(i);
+  }
+  return output;
+}
+
+async function _initPushSubscription(vapidPublicKey) {
+  if (!vapidPublicKey) {
+    console.warn('[baton] VAPID public key not available — push subscription skipped');
+    return;
+  }
+  if (!('serviceWorker' in navigator) || !('PushManager' in window)) {
+    return;
+  }
+  try {
+    const registration = await navigator.serviceWorker.ready;
+    const existing = await registration.pushManager.getSubscription();
+    if (existing) return;
+    const applicationServerKey = _urlBase64ToUint8Array(vapidPublicKey);
+    const subscription = await registration.pushManager.subscribe({
+      userVisibleOnly: true,
+      applicationServerKey,
+    });
+    _storage.setItem('baton_push_subscription', JSON.stringify(subscription));
+    console.info('[baton] Push subscription created');
+  } catch (err) {
+    console.warn('[baton] Push subscription failed:', err);
+  }
+}
+
+// ========== Registration (account sign-up) ==========
+
+async function _getPushSubscriptionForReg() {
+  if (!('serviceWorker' in navigator) || !('PushManager' in window)) return null;
+  try {
+    const vapidKey = await _fetchVapidPublicKey();
+    if (!vapidKey) return null;
+    const registration = await navigator.serviceWorker.ready;
+    const existing = await registration.pushManager.getSubscription();
+    if (existing) return existing.toJSON();
+    const applicationServerKey = _urlBase64ToUint8Array(vapidKey);
+    const subscription = await registration.pushManager.subscribe({
+      userVisibleOnly: true,
+      applicationServerKey,
+    });
+    return subscription.toJSON();
+  } catch (err) {
+    console.warn('[baton] Push subscription for registration failed:', err);
+    return null;
+  }
+}
+
+async function _handleSignUp() {
+  const emailInput = document.getElementById('reg-email');
+  const loginInput = document.getElementById('reg-login');
+  const passwordInput = document.getElementById('reg-password');
+  const btn = document.getElementById('btn-register');
+  if (!emailInput || !loginInput || !passwordInput || !btn) return;
+
+  const email = emailInput.value.trim();
+  const login = loginInput.value.trim();
+  const password = passwordInput.value;
+
+  if (!email || !login || !password) {
+    _setRegStatus('Заполните все поля.', 'error');
+    return;
+  }
+  if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
+    _setRegStatus('Введите корректный email.', 'error');
+    return;
+  }
+
+  btn.disabled = true;
+  const originalText = btn.textContent.trim();
+  btn.textContent = '...';
+  _setRegStatus('', '');
+
+  try {
+    const push_subscription = await _getPushSubscriptionForReg().catch(() => null);
+    await _apiPost('/api/auth/register', { email, login, password, push_subscription });
+    passwordInput.value = '';
+    _setRegStatus('Заявка отправлена. Ожидайте подтверждения администратора.', 'success');
+  } catch (err) {
+    let msg = 'Ошибка. Попробуйте ещё раз.';
+    if (err && err.message) {
+      const colonIdx = err.message.indexOf(': ');
+      if (colonIdx !== -1) {
+        try {
+          const parsed = JSON.parse(err.message.slice(colonIdx + 2));
+          if (parsed.detail) msg = parsed.detail;
+        } catch (_) {}
+      }
+    }
+    _setRegStatus(msg, 'error');
+    btn.disabled = false;
+    btn.textContent = originalText;
+  }
+}
+
 // ========== Init ==========
 
 function _init() {
@@ -269,6 +424,11 @@ function _init() {
   } else {
     _showOnboarding();
   }
+
+  // Fire-and-forget: fetch VAPID key from API and subscribe to push (non-blocking)
+  _fetchVapidPublicKey().then(_initPushSubscription).catch((err) => {
+    console.warn('[baton] Push init error:', err);
+  });
 }
 
 document.addEventListener('DOMContentLoaded', () => {
diff --git a/frontend/index.html b/frontend/index.html
index e5fe30e..f04d171 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -36,7 +36,9 @@
 
   <!-- Onboarding screen: shown on first visit (no UUID registered yet) -->
   <div id="screen-onboarding" class="screen" role="main" hidden>
-    <div class="screen-content">
+
+    <!-- View: name entry (existing onboarding) -->
+    <div class="screen-content" id="view-login">
       <input
         type="text"
         id="name-input"
@@ -52,7 +54,53 @@
       <button type="button" id="btn-confirm" class="btn-confirm" disabled>
         Confirm
       </button>
+      <button type="button" id="btn-switch-to-register" class="btn-link">
+        Зарегистрироваться
+      </button>
     </div>
+
+    <!-- View: account registration -->
+    <div class="screen-content" id="view-register" hidden>
+      <input
+        type="email"
+        id="reg-email"
+        class="name-input"
+        placeholder="Email"
+        autocomplete="email"
+        autocorrect="off"
+        autocapitalize="none"
+        spellcheck="false"
+        aria-label="Email"
+      >
+      <input
+        type="text"
+        id="reg-login"
+        class="name-input"
+        placeholder="Логин"
+        maxlength="64"
+        autocomplete="username"
+        autocorrect="off"
+        autocapitalize="none"
+        spellcheck="false"
+        aria-label="Логин"
+      >
+      <input
+        type="password"
+        id="reg-password"
+        class="name-input"
+        placeholder="Пароль"
+        autocomplete="new-password"
+        aria-label="Пароль"
+      >
+      <button type="button" id="btn-register" class="btn-confirm">
+        Зарегистрироваться
+      </button>
+      <button type="button" id="btn-switch-to-login" class="btn-link">
+        ← Назад
+      </button>
+      <div id="reg-status" class="reg-status" hidden></div>
+    </div>
+
   </div>
 
   <!-- Main screen: SOS button -->
diff --git a/frontend/style.css b/frontend/style.css
index 487a443..36f7685 100644
--- a/frontend/style.css
+++ b/frontend/style.css
@@ -198,3 +198,35 @@ body {
 .status[hidden]    { display: none; }
 .status--error     { color: #f87171; }
 .status--success   { color: #4ade80; }
+
+/* ===== Registration form ===== */
+
+/* Override display:flex so [hidden] works on screen-content divs */
+.screen-content[hidden] { display: none; }
+
+.btn-link {
+  background: none;
+  border: none;
+  color: var(--muted);
+  font-size: 14px;
+  cursor: pointer;
+  padding: 4px 0;
+  text-decoration: underline;
+  text-underline-offset: 2px;
+  -webkit-tap-highlight-color: transparent;
+}
+
+.btn-link:active { color: var(--text); }
+
+.reg-status {
+  width: 100%;
+  max-width: 320px;
+  font-size: 14px;
+  text-align: center;
+  line-height: 1.5;
+  padding: 4px 0;
+}
+
+.reg-status[hidden]    { display: none; }
+.reg-status--error     { color: #f87171; }
+.reg-status--success   { color: #4ade80; }
diff --git a/tests/test_arch_002.py b/tests/test_arch_002.py
index c979b1d..dd737b9 100644
--- a/tests/test_arch_002.py
+++ b/tests/test_arch_002.py
@@ -168,25 +168,17 @@ async def test_signal_message_contains_utc_marker():
 
 
 # ---------------------------------------------------------------------------
-# Criterion 3 — SignalAggregator preserved with '# v2.0 feature' marker (static)
+# Criterion 3 — SignalAggregator removed (BATON-BIZ-004: dead code cleanup)
 # ---------------------------------------------------------------------------
 
 
-def test_signal_aggregator_class_preserved_in_telegram():
-    """SignalAggregator class must still exist in telegram.py (ADR-004, reserved for v2)."""
+def test_signal_aggregator_class_removed_from_telegram():
+    """SignalAggregator must be removed from telegram.py (BATON-BIZ-004)."""
     source = (_BACKEND_DIR / "telegram.py").read_text()
-    assert "class SignalAggregator" in source
+    assert "class SignalAggregator" not in source
 
 
-def test_signal_aggregator_has_v2_feature_comment():
-    """The line immediately before 'class SignalAggregator' must contain '# v2.0 feature'."""
-    lines = (_BACKEND_DIR / "telegram.py").read_text().splitlines()
-    class_line_idx = next(
-        (i for i, line in enumerate(lines) if "class SignalAggregator" in line), None
-    )
-    assert class_line_idx is not None, "class SignalAggregator not found in telegram.py"
-    assert class_line_idx > 0, "SignalAggregator is on the first line — no preceding comment line"
-    preceding_line = lines[class_line_idx - 1]
-    assert "# v2.0 feature" in preceding_line, (
-        f"Expected '# v2.0 feature' on line before class SignalAggregator, got: {preceding_line!r}"
-    )
+def test_signal_aggregator_not_referenced_in_telegram():
+    """telegram.py must not reference SignalAggregator at all (BATON-BIZ-004)."""
+    source = (_BACKEND_DIR / "telegram.py").read_text()
+    assert "SignalAggregator" not in source
diff --git a/tests/test_baton_008.py b/tests/test_baton_008.py
index f572cd8..b1e0c03 100644
--- a/tests/test_baton_008.py
+++ b/tests/test_baton_008.py
@@ -583,3 +583,306 @@ async def test_password_hash_stored_in_pbkdf2_format():
     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)
+
+
+# ---------------------------------------------------------------------------
+# 15. State machine — повторное нажатие approve на уже approved
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_double_approve_does_not_send_push():
+    """Second approve on already-approved registration must NOT fire push."""
+    push_sub = {
+        "endpoint": "https://fcm.googleapis.com/fcm/send/test2",
+        "keys": {"p256dh": "BQDEF", "auth": "abc"},
+    }
+    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": "double@example.com", "login": "doubleuser", "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_d1",
+                "data": f"approve:{reg_id}",
+                "message": {"message_id": 60, "chat": {"id": 5694335584}},
+            }
+        }
+
+        # First approve — should succeed
+        await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
+        await asyncio.sleep(0)
+
+        # Second approve — push must NOT be fired
+        push_calls: list = []
+
+        async def _capture_push(sub_json, title, body):
+            push_calls.append(sub_json)
+
+        cb_payload2 = {**cb_payload, "callback_query": {**cb_payload["callback_query"], "id": "cq_d2"}}
+        with patch("backend.push.send_push", side_effect=_capture_push):
+            await client.post("/api/webhook/telegram", json=cb_payload2, headers=_WEBHOOK_HEADERS)
+            await asyncio.sleep(0)
+
+    assert len(push_calls) == 0, f"Second approve must not fire push, got {len(push_calls)} calls"
+
+    # Also verify status is still 'approved'
+    from backend import db as _db
+    # Can't check here as client context is closed; DB assertion was covered by state machine logic
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_double_approve_status_stays_approved():
+    """Status remains 'approved' after a second approve callback."""
+    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, "email": "stay@example.com", "login": "stayuser"},
+            )
+        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 = {
+            "callback_query": {
+                "id": "cq_s1",
+                "data": f"approve:{reg_id}",
+                "message": {"message_id": 70, "chat": {"id": 5694335584}},
+            }
+        }
+        await client.post("/api/webhook/telegram", json=cb, headers=_WEBHOOK_HEADERS)
+        await asyncio.sleep(0)
+
+        cb2 = {**cb, "callback_query": {**cb["callback_query"], "id": "cq_s2"}}
+        await client.post("/api/webhook/telegram", json=cb2, headers=_WEBHOOK_HEADERS)
+        await asyncio.sleep(0)
+
+        reg = await _db.get_registration(reg_id)
+        assert reg["status"] == "approved", f"Expected 'approved', got {reg['status']!r}"
+
+
+# ---------------------------------------------------------------------------
+# 16. State machine — approve после reject
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_approve_after_reject_status_stays_rejected():
+    """Approve after reject must NOT change status — remains 'rejected'."""
+    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, "email": "artest@example.com", "login": "artestuser"},
+            )
+        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
+
+        # First: reject
+        rej_cb = {
+            "callback_query": {
+                "id": "cq_ar1",
+                "data": f"reject:{reg_id}",
+                "message": {"message_id": 80, "chat": {"id": 5694335584}},
+            }
+        }
+        await client.post("/api/webhook/telegram", json=rej_cb, headers=_WEBHOOK_HEADERS)
+        await asyncio.sleep(0)
+
+        # Then: approve — must be ignored
+        push_calls: list = []
+
+        async def _capture_push(sub_json, title, body):
+            push_calls.append(sub_json)
+
+        app_cb = {
+            "callback_query": {
+                "id": "cq_ar2",
+                "data": f"approve:{reg_id}",
+                "message": {"message_id": 81, "chat": {"id": 5694335584}},
+            }
+        }
+        with patch("backend.push.send_push", side_effect=_capture_push):
+            await client.post("/api/webhook/telegram", json=app_cb, headers=_WEBHOOK_HEADERS)
+            await asyncio.sleep(0)
+
+        reg = await _db.get_registration(reg_id)
+        assert reg["status"] == "rejected", f"Expected 'rejected', got {reg['status']!r}"
+
+    assert len(push_calls) == 0, f"Approve after reject must not fire push, got {len(push_calls)}"
+
+
+# ---------------------------------------------------------------------------
+# 17. Rate limiting — 4th request returns 429
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_rate_limit_fourth_request_returns_429():
+    """4th registration request from same IP within the window returns 429."""
+    async with make_app_client() as client:
+        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
+            for i in range(3):
+                r = await client.post(
+                    "/api/auth/register",
+                    json={
+                        "email": f"ratetest{i}@example.com",
+                        "login": f"ratetest{i}",
+                        "password": "strongpassword123",
+                    },
+                )
+                assert r.status_code == 201, f"Request {i+1} should succeed, got {r.status_code}"
+
+            # 4th request — must be rate-limited
+            r4 = await client.post(
+                "/api/auth/register",
+                json={
+                    "email": "ratetest4@example.com",
+                    "login": "ratetest4",
+                    "password": "strongpassword123",
+                },
+            )
+
+    assert r4.status_code == 429, f"Expected 429 on 4th request, got {r4.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 18. VAPID public key endpoint /api/push/public-key
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_vapid_public_key_new_endpoint_returns_200():
+    """GET /api/push/public-key returns 200 with vapid_public_key field."""
+    async with make_app_client() as client:
+        resp = await client.get("/api/push/public-key")
+
+    assert resp.status_code == 200, f"Expected 200, got {resp.status_code}: {resp.text}"
+    body = resp.json()
+    assert "vapid_public_key" in body, f"Expected 'vapid_public_key' in response, got {body}"
+
+
+# ---------------------------------------------------------------------------
+# 19. Password max length — 129 chars → 422
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_password_too_long():
+    """Password of 129 characters returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/register",
+            json={**_VALID_PAYLOAD, "password": "a" * 129},
+        )
+    assert resp.status_code == 422, f"Expected 422 on 129-char password, got {resp.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 20. Login max length — 31 chars → 422
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_login_too_long():
+    """Login of 31 characters returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/register",
+            json={**_VALID_PAYLOAD, "login": "a" * 31},
+        )
+    assert resp.status_code == 422, f"Expected 422 on 31-char login, got {resp.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 21. Empty body — POST /api/auth/register with {} → 422
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_auth_register_422_empty_body():
+    """Empty JSON body returns 422."""
+    async with make_app_client() as client:
+        resp = await client.post("/api/auth/register", json={})
+    assert resp.status_code == 422, f"Expected 422 on empty body, got {resp.status_code}"
+
+
+# ---------------------------------------------------------------------------
+# 22. Malformed callback_data — no colon → ok:True without crash
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_malformed_data_no_colon_returns_ok():
+    """callback_query with data='garbage' (no colon) returns ok:True gracefully."""
+    async with make_app_client() as client:
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_mal1",
+                "data": "garbage",
+                "message": {"message_id": 90, "chat": {"id": 5694335584}},
+            }
+        }
+        resp = await client.post(
+            "/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS
+        )
+
+    assert resp.status_code == 200, f"Expected 200, got {resp.status_code}"
+    assert resp.json() == {"ok": True}, f"Expected ok:True, got {resp.json()}"
+
+
+# ---------------------------------------------------------------------------
+# 23. Non-numeric reg_id — data='approve:abc' → ok:True without crash
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_webhook_callback_non_numeric_reg_id_returns_ok():
+    """callback_query with data='approve:abc' (non-numeric reg_id) returns ok:True."""
+    async with make_app_client() as client:
+        cb_payload = {
+            "callback_query": {
+                "id": "cq_nan1",
+                "data": "approve:abc",
+                "message": {"message_id": 91, "chat": {"id": 5694335584}},
+            }
+        }
+        resp = await client.post(
+            "/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS
+        )
+
+    assert resp.status_code == 200, f"Expected 200, got {resp.status_code}"
+    assert resp.json() == {"ok": True}, f"Expected ok:True, got {resp.json()}"
diff --git a/tests/test_baton_008_frontend.py b/tests/test_baton_008_frontend.py
new file mode 100644
index 0000000..c19bd96
--- /dev/null
+++ b/tests/test_baton_008_frontend.py
@@ -0,0 +1,439 @@
+"""
+Tests for BATON-008: Frontend registration module.
+
+Acceptance criteria:
+1. index.html — форма регистрации с полями email, login, password присутствует
+2. index.html — НЕТ захардкоженных VAPID-ключей в HTML-атрибутах (decision #1333)
+3. app.js — вызов /api/push/public-key (не старый /api/vapid-public-key) (decision #1331)
+4. app.js — guard для PushManager (decision #1332)
+5. app.js — обработчик для кнопки регистрации (#btn-register → _handleSignUp)
+6. app.js — переключение между view-login и view-register
+7. app.js — показ ошибок пользователю (_setRegStatus)
+8. GET /api/push/public-key → 200 с vapid_public_key (API контракт)
+9. POST /api/auth/register с валидными данными → 201 (API контракт)
+10. POST /api/auth/register с дублирующим email → 409
+11. POST /api/auth/register с дублирующим login → 409
+12. POST /api/auth/register с невалидным email → 422
+"""
+from __future__ import annotations
+
+import re
+from pathlib import Path
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+PROJECT_ROOT = Path(__file__).parent.parent
+INDEX_HTML = PROJECT_ROOT / "frontend" / "index.html"
+APP_JS = PROJECT_ROOT / "frontend" / "app.js"
+
+from tests.conftest import make_app_client
+
+_VALID_PAYLOAD = {
+    "email": "frontend_test@example.com",
+    "login": "frontenduser",
+    "password": "strongpassword123",
+}
+
+
+# ---------------------------------------------------------------------------
+# HTML static analysis — Criterion 1: поля формы регистрации
+# ---------------------------------------------------------------------------
+
+
+def test_index_html_has_email_field() -> None:
+    """index.html должен содержать поле email для регистрации (id=reg-email)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="reg-email"' in content, (
+        "index.html не содержит поле с id='reg-email'"
+    )
+
+
+def test_index_html_has_login_field() -> None:
+    """index.html должен содержать поле логина для регистрации (id=reg-login)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="reg-login"' in content, (
+        "index.html не содержит поле с id='reg-login'"
+    )
+
+
+def test_index_html_has_password_field() -> None:
+    """index.html должен содержать поле пароля для регистрации (id=reg-password)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="reg-password"' in content, (
+        "index.html не содержит поле с id='reg-password'"
+    )
+
+
+def test_index_html_email_field_has_correct_type() -> None:
+    """Поле email регистрации должно иметь type='email'."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    # Ищем input с id=reg-email и type=email в любом порядке атрибутов
+    email_input_block = re.search(
+        r'<input[^>]*id="reg-email"[^>]*>', content, re.DOTALL
+    )
+    assert email_input_block is not None, "Не найден input с id='reg-email'"
+    assert 'type="email"' in email_input_block.group(0), (
+        "Поле reg-email не имеет type='email'"
+    )
+
+
+def test_index_html_password_field_has_correct_type() -> None:
+    """Поле пароля регистрации должно иметь type='password'."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    password_input_block = re.search(
+        r'<input[^>]*id="reg-password"[^>]*>', content, re.DOTALL
+    )
+    assert password_input_block is not None, "Не найден input с id='reg-password'"
+    assert 'type="password"' in password_input_block.group(0), (
+        "Поле reg-password не имеет type='password'"
+    )
+
+
+def test_index_html_has_register_button() -> None:
+    """index.html должен содержать кнопку регистрации (id=btn-register)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="btn-register"' in content, (
+        "index.html не содержит кнопку с id='btn-register'"
+    )
+
+
+def test_index_html_has_switch_to_register_button() -> None:
+    """index.html должен содержать кнопку переключения на форму регистрации (id=btn-switch-to-register)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="btn-switch-to-register"' in content, (
+        "index.html не содержит кнопку с id='btn-switch-to-register'"
+    )
+
+
+def test_index_html_has_view_register_div() -> None:
+    """index.html должен содержать блок view-register для формы регистрации."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="view-register"' in content, (
+        "index.html не содержит блок с id='view-register'"
+    )
+
+
+def test_index_html_has_view_login_div() -> None:
+    """index.html должен содержать блок view-login для онбординга."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="view-login"' in content, (
+        "index.html не содержит блок с id='view-login'"
+    )
+
+
+def test_index_html_has_reg_status_element() -> None:
+    """index.html должен содержать элемент статуса регистрации (id=reg-status)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert 'id="reg-status"' in content, (
+        "index.html не содержит элемент с id='reg-status'"
+    )
+
+
+# ---------------------------------------------------------------------------
+# HTML static analysis — Criterion 2: НЕТ захардкоженного VAPID в HTML (decision #1333)
+# ---------------------------------------------------------------------------
+
+
+def test_index_html_no_hardcoded_vapid_key_in_meta() -> None:
+    """index.html НЕ должен содержать VAPID-ключ захардкоженным в meta-теге (decision #1333)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    # VAPID public key — это URL-safe base64 строка длиной 87 символов (без padding)
+    # Ищем характерный паттерн в meta-атрибутах
+    vapid_in_meta = re.search(
+        r'<meta[^>]+content\s*=\s*["\'][A-Za-z0-9_\-]{60,}["\'][^>]*>',
+        content,
+    )
+    assert vapid_in_meta is None, (
+        f"Найден meta-тег с длинной строкой (возможный VAPID-ключ): "
+        f"{vapid_in_meta.group(0) if vapid_in_meta else ''}"
+    )
+
+
+def test_index_html_no_vapid_key_attribute_pattern() -> None:
+    """index.html НЕ должен содержать data-vapid-key или аналогичные атрибуты."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert "vapid" not in content.lower(), (
+        "index.html содержит упоминание 'vapid' — VAPID ключ должен читаться через API, "
+        "а не быть захардкожен в HTML (decision #1333)"
+    )
+
+
+# ---------------------------------------------------------------------------
+# app.js static analysis — Criterion 3: /api/push/public-key endpoint (decision #1331)
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_uses_new_vapid_endpoint() -> None:
+    """app.js должен обращаться к /api/push/public-key (decision #1331)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "/api/push/public-key" in content, (
+        "app.js не содержит endpoint '/api/push/public-key'"
+    )
+
+
+def test_app_js_does_not_use_old_vapid_endpoint() -> None:
+    """app.js НЕ должен использовать устаревший /api/vapid-public-key (decision #1331)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "/api/vapid-public-key" not in content, (
+        "app.js содержит устаревший endpoint '/api/vapid-public-key' — "
+        "нарушение decision #1331, должен использоваться '/api/push/public-key'"
+    )
+
+
+# ---------------------------------------------------------------------------
+# app.js static analysis — Criterion 4: PushManager guard (decision #1332)
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_has_push_manager_guard_in_registration_flow() -> None:
+    """app.js должен содержать guard 'PushManager' in window (decision #1332)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "'PushManager' in window" in content, (
+        "app.js не содержит guard \"'PushManager' in window\" — "
+        "нарушение decision #1332"
+    )
+
+
+def test_app_js_push_manager_guard_combined_with_service_worker_check() -> None:
+    """Guard PushManager должен сочетаться с проверкой serviceWorker."""
+    content = APP_JS.read_text(encoding="utf-8")
+    # Ищем паттерн совместной проверки serviceWorker + PushManager
+    assert re.search(
+        r"serviceWorker.*PushManager|PushManager.*serviceWorker",
+        content,
+        re.DOTALL,
+    ), (
+        "app.js не содержит совместной проверки 'serviceWorker' и 'PushManager' — "
+        "guard неполный (decision #1332)"
+    )
+
+
+# ---------------------------------------------------------------------------
+# app.js static analysis — Criterion 5: обработчик кнопки регистрации
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_has_handle_sign_up_function() -> None:
+    """app.js должен содержать функцию _handleSignUp."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "_handleSignUp" in content, (
+        "app.js не содержит функцию '_handleSignUp'"
+    )
+
+
+def test_app_js_registers_click_handler_for_btn_register() -> None:
+    """app.js должен добавлять click-обработчик на btn-register → _handleSignUp."""
+    content = APP_JS.read_text(encoding="utf-8")
+    # Ищем addEventListener на элементе btn-register с вызовом _handleSignUp
+    assert re.search(
+        r'btn-register.*addEventListener|addEventListener.*btn-register',
+        content,
+        re.DOTALL,
+    ), (
+        "app.js не содержит addEventListener для кнопки 'btn-register'"
+    )
+    # Проверяем что именно _handleSignUp привязан к кнопке
+    assert re.search(
+        r'btn[Rr]egister.*_handleSignUp|_handleSignUp.*btn[Rr]egister',
+        content,
+        re.DOTALL,
+    ), (
+        "app.js не связывает кнопку 'btn-register' с функцией '_handleSignUp'"
+    )
+
+
+# ---------------------------------------------------------------------------
+# app.js static analysis — Criterion 6: переключение view-login / view-register
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_has_show_view_function() -> None:
+    """app.js должен содержать функцию _showView для переключения видов."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "_showView" in content, (
+        "app.js не содержит функцию '_showView'"
+    )
+
+
+def test_app_js_show_view_handles_view_login() -> None:
+    """_showView в app.js должна обрабатывать view-login."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "view-login" in content, (
+        "app.js не содержит id 'view-login' — нет переключения на вид логина"
+    )
+
+
+def test_app_js_show_view_handles_view_register() -> None:
+    """_showView в app.js должна обрабатывать view-register."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "view-register" in content, (
+        "app.js не содержит id 'view-register' — нет переключения на вид регистрации"
+    )
+
+
+def test_app_js_has_btn_switch_to_register_handler() -> None:
+    """app.js должен содержать обработчик для btn-switch-to-register."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "btn-switch-to-register" in content, (
+        "app.js не содержит ссылку на 'btn-switch-to-register'"
+    )
+
+
+def test_app_js_has_btn_switch_to_login_handler() -> None:
+    """app.js должен содержать обработчик для btn-switch-to-login (назад)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "btn-switch-to-login" in content, (
+        "app.js не содержит ссылку на 'btn-switch-to-login'"
+    )
+
+
+# ---------------------------------------------------------------------------
+# app.js static analysis — Criterion 7: обработка ошибок / показ сообщения пользователю
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_has_set_reg_status_function() -> None:
+    """app.js должен содержать _setRegStatus для показа статуса в форме регистрации."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "_setRegStatus" in content, (
+        "app.js не содержит функцию '_setRegStatus'"
+    )
+
+
+def test_app_js_handle_sign_up_shows_error_on_empty_fields() -> None:
+    """_handleSignUp должна вызывать _setRegStatus с ошибкой при пустых полях."""
+    content = APP_JS.read_text(encoding="utf-8")
+    # Проверяем наличие валидации пустых полей внутри _handleSignUp-подобного блока
+    assert re.search(
+        r"_setRegStatus\s*\([^)]*error",
+        content,
+    ), (
+        "app.js не содержит вызов _setRegStatus с классом 'error' "
+        "— ошибки не отображаются пользователю"
+    )
+
+
+def test_app_js_handle_sign_up_shows_success_on_ok() -> None:
+    """_handleSignUp должна вызывать _setRegStatus с success при успешной регистрации."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(
+        r"_setRegStatus\s*\([^)]*success",
+        content,
+    ), (
+        "app.js не содержит вызов _setRegStatus с классом 'success' "
+        "— пользователь не уведомляется об успехе регистрации"
+    )
+
+
+def test_app_js_clears_password_after_successful_signup() -> None:
+    """_handleSignUp должна очищать поле пароля после успешной отправки."""
+    content = APP_JS.read_text(encoding="utf-8")
+    # Ищем сброс значения пароля
+    assert re.search(
+        r"passwordInput\.value\s*=\s*['\"][\s]*['\"]",
+        content,
+    ), (
+        "app.js не очищает поле пароля после успешной регистрации — "
+        "пароль остаётся в DOM (security concern)"
+    )
+
+
+def test_app_js_uses_api_auth_register_endpoint() -> None:
+    """app.js должен отправлять форму на /api/auth/register."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "/api/auth/register" in content, (
+        "app.js не содержит endpoint '/api/auth/register'"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Integration tests — API контракты (Criteria 8–12)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_vapid_public_key_endpoint_returns_200_with_key():
+    """GET /api/push/public-key → 200 с полем vapid_public_key."""
+    async with make_app_client() as client:
+        resp = await client.get("/api/push/public-key")
+
+    assert resp.status_code == 200, (
+        f"GET /api/push/public-key вернул {resp.status_code}, ожидался 200"
+    )
+    body = resp.json()
+    assert "vapid_public_key" in body, (
+        f"Ответ /api/push/public-key не содержит 'vapid_public_key': {body}"
+    )
+    assert isinstance(body["vapid_public_key"], str), (
+        "vapid_public_key должен быть строкой"
+    )
+
+
+@pytest.mark.asyncio
+async def test_register_valid_payload_returns_201_pending():
+    """POST /api/auth/register с валидными данными → 201 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"POST /api/auth/register вернул {resp.status_code}: {resp.text}"
+    )
+    body = resp.json()
+    assert body.get("status") == "pending", (
+        f"Ожидался status='pending', получено: {body}"
+    )
+    assert "message" in body, (
+        f"Ответ не содержит поле 'message': {body}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_register_duplicate_email_returns_409():
+    """POST /api/auth/register с дублирующим email → 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"Первая регистрация не прошла: {r1.text}"
+
+            r2 = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "login": "anotherlogin"},
+            )
+
+    assert r2.status_code == 409, (
+        f"Дублирующий email должен вернуть 409, получено {r2.status_code}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_register_duplicate_login_returns_409():
+    """POST /api/auth/register с дублирующим login → 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"Первая регистрация не прошла: {r1.text}"
+
+            r2 = await client.post(
+                "/api/auth/register",
+                json={**_VALID_PAYLOAD, "email": "another@example.com"},
+            )
+
+    assert r2.status_code == 409, (
+        f"Дублирующий login должен вернуть 409, получено {r2.status_code}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_register_invalid_email_returns_422():
+    """POST /api/auth/register с невалидным email → 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"Невалидный email должен вернуть 422, получено {resp.status_code}"
+    )
diff --git a/tests/test_biz_001.py b/tests/test_biz_001.py
new file mode 100644
index 0000000..21f822e
--- /dev/null
+++ b/tests/test_biz_001.py
@@ -0,0 +1,338 @@
+"""
+Tests for BATON-BIZ-001: Login mechanism for approved users (dual-layer: AST + httpx functional).
+
+Acceptance criteria:
+1. Успешный login по login-полю → 200 + token
+2. Успешный login по email-полю → 200 + token
+3. Неверный пароль → 401 (без раскрытия причины)
+4. Статус pending → 403 с читаемым сообщением
+5. Статус rejected → 403 с читаемым сообщением
+6. Rate limit — 6-й запрос подряд → 429
+7. Guard middleware возвращает 401 без токена
+8. Guard middleware пропускает валидный токен
+
+Additional: error message uniformity, PBKDF2 verification.
+"""
+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")
+os.environ.setdefault("ADMIN_CHAT_ID", "5694335584")
+
+import pytest
+from fastapi import HTTPException
+from fastapi.security import HTTPAuthorizationCredentials
+
+from backend import db
+from backend.middleware import create_auth_token, verify_auth_token
+from tests.conftest import make_app_client
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+async def _register_auth(client, email: str, login: str, password: str) -> int:
+    """Register via /api/auth/register, return registration id."""
+    resp = await client.post(
+        "/api/auth/register",
+        json={"email": email, "login": login, "password": password},
+    )
+    assert resp.status_code == 201, f"auth/register failed: {resp.text}"
+    reg = await db.get_registration_by_login_or_email(login)
+    assert reg is not None
+    return reg["id"]
+
+
+async def _approve(reg_id: int) -> None:
+    await db.update_registration_status(reg_id, "approved")
+
+
+async def _reject(reg_id: int) -> None:
+    await db.update_registration_status(reg_id, "rejected")
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — Успешный login по login-полю
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_login_by_login_field_returns_200_with_token():
+    """Approved user can login using their login field → 200 + token."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "alice@example.com", "alice", "password123")
+        await _approve(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "alice", "password": "password123"},
+        )
+    assert resp.status_code == 200
+    data = resp.json()
+    assert "token" in data
+    assert data["login"] == "alice"
+
+
+@pytest.mark.asyncio
+async def test_login_by_login_field_token_is_non_empty_string():
+    """Token returned for approved login user is a non-empty string."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "alice2@example.com", "alice2", "password123")
+        await _approve(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "alice2", "password": "password123"},
+        )
+    assert isinstance(resp.json()["token"], str)
+    assert len(resp.json()["token"]) > 0
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — Успешный login по email-полю
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_login_by_email_field_returns_200_with_token():
+    """Approved user can login using their email field → 200 + token."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "bob@example.com", "bobuser", "securepass1")
+        await _approve(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "bob@example.com", "password": "securepass1"},
+        )
+    assert resp.status_code == 200
+    data = resp.json()
+    assert "token" in data
+    assert data["login"] == "bobuser"
+
+
+@pytest.mark.asyncio
+async def test_login_by_email_field_token_login_matches_registration():
+    """Token response login field matches the login set during registration."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "bob2@example.com", "bob2user", "securepass1")
+        await _approve(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "bob2@example.com", "password": "securepass1"},
+        )
+    assert resp.json()["login"] == "bob2user"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — Неверный пароль → 401 без раскрытия причины
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_wrong_password_returns_401():
+    """Wrong password returns 401 with generic message (no detail about which field failed)."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "carol@example.com", "carol", "correctpass1")
+        await _approve(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "carol", "password": "wrongpassword"},
+        )
+    assert resp.status_code == 401
+    assert "Неверный логин или пароль" in resp.json()["detail"]
+
+
+@pytest.mark.asyncio
+async def test_nonexistent_user_returns_401_same_message_as_wrong_password():
+    """Non-existent login returns same 401 message as wrong password (prevents user enumeration)."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "doesnotexist", "password": "anypassword"},
+        )
+    assert resp.status_code == 401
+    assert "Неверный логин или пароль" in resp.json()["detail"]
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — Статус pending → 403 с читаемым сообщением
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_pending_user_login_returns_403():
+    """User with pending status gets 403."""
+    async with make_app_client() as client:
+        await _register_auth(client, "dave@example.com", "dave", "password123")
+        # Status is 'pending' by default — no approval step
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "dave", "password": "password123"},
+        )
+    assert resp.status_code == 403
+
+
+@pytest.mark.asyncio
+async def test_pending_user_login_403_message_is_human_readable():
+    """403 message for pending user contains readable Russian text about the waiting status."""
+    async with make_app_client() as client:
+        await _register_auth(client, "dave2@example.com", "dave2", "password123")
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "dave2", "password": "password123"},
+        )
+    assert "ожидает" in resp.json()["detail"]
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5 — Статус rejected → 403 с читаемым сообщением
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_rejected_user_login_returns_403():
+    """User with rejected status gets 403."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "eve@example.com", "evegirl", "password123")
+        await _reject(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "evegirl", "password": "password123"},
+        )
+    assert resp.status_code == 403
+
+
+@pytest.mark.asyncio
+async def test_rejected_user_login_403_message_is_human_readable():
+    """403 message for rejected user contains readable Russian text about rejection."""
+    async with make_app_client() as client:
+        reg_id = await _register_auth(client, "eve2@example.com", "eve2girl", "password123")
+        await _reject(reg_id)
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "eve2girl", "password": "password123"},
+        )
+    assert "отклонена" in resp.json()["detail"]
+
+
+# ---------------------------------------------------------------------------
+# Criterion 6 — Rate limit: 6-й запрос подряд → 429
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_triggers_on_sixth_login_attempt():
+    """Login rate limit (5 per window) triggers 429 exactly on the 6th request."""
+    async with make_app_client() as client:
+        statuses = []
+        for _ in range(6):
+            resp = await client.post(
+                "/api/auth/login",
+                json={"login_or_email": "nouser_rl", "password": "nopass"},
+                headers={"X-Real-IP": "10.99.99.1"},
+            )
+            statuses.append(resp.status_code)
+    # First 5 attempts pass rate limit (user not found → 401)
+    assert all(s == 401 for s in statuses[:5]), (
+        f"Первые 5 попыток должны быть 401, получили: {statuses[:5]}"
+    )
+    # 6th attempt hits rate limit
+    assert statuses[5] == 429, (
+        f"6-я попытка должна быть 429, получили: {statuses[5]}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_fifth_attempt_still_passes():
+    """5th login attempt is still allowed (rate limit triggers only on 6th)."""
+    async with make_app_client() as client:
+        for i in range(4):
+            await client.post(
+                "/api/auth/login",
+                json={"login_or_email": "nouser_rl2", "password": "nopass"},
+                headers={"X-Real-IP": "10.99.99.2"},
+            )
+        resp = await client.post(
+            "/api/auth/login",
+            json={"login_or_email": "nouser_rl2", "password": "nopass"},
+            headers={"X-Real-IP": "10.99.99.2"},
+        )
+    assert resp.status_code == 401, (
+        f"5-я попытка должна пройти rate limit и вернуть 401, получили: {resp.status_code}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 7 — Guard middleware: 401 без токена
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_verify_auth_token_raises_401_when_credentials_is_none():
+    """verify_auth_token raises HTTPException 401 when no credentials provided."""
+    with pytest.raises(HTTPException) as exc_info:
+        await verify_auth_token(credentials=None)
+    assert exc_info.value.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_verify_auth_token_raises_401_for_malformed_token():
+    """verify_auth_token raises HTTPException 401 for a malformed/invalid token."""
+    creds = HTTPAuthorizationCredentials(scheme="Bearer", credentials="not.a.valid.jwt")
+    with pytest.raises(HTTPException) as exc_info:
+        await verify_auth_token(credentials=creds)
+    assert exc_info.value.status_code == 401
+
+
+# ---------------------------------------------------------------------------
+# Criterion 8 — Guard middleware: валидный токен пропускается
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_verify_auth_token_returns_payload_for_valid_token():
+    """verify_auth_token returns decoded JWT payload for a valid signed token."""
+    token = create_auth_token(reg_id=42, login="testuser")
+    creds = HTTPAuthorizationCredentials(scheme="Bearer", credentials=token)
+    payload = await verify_auth_token(credentials=creds)
+    assert payload["sub"] == "42"
+    assert payload["login"] == "testuser"
+
+
+@pytest.mark.asyncio
+async def test_verify_auth_token_payload_contains_expected_fields():
+    """Payload returned by verify_auth_token contains sub, login, iat, exp fields."""
+    token = create_auth_token(reg_id=7, login="inspector")
+    creds = HTTPAuthorizationCredentials(scheme="Bearer", credentials=token)
+    payload = await verify_auth_token(credentials=creds)
+    for field in ("sub", "login", "iat", "exp"):
+        assert field in payload, f"Поле '{field}' отсутствует в payload"
+
+
+# ---------------------------------------------------------------------------
+# Additional: PBKDF2 correctness — verify_password timing-safe
+# ---------------------------------------------------------------------------
+
+
+def test_hash_and_verify_password_returns_true_for_correct_password():
+    """_hash_password + _verify_password: correct password returns True."""
+    from backend.main import _hash_password, _verify_password
+    stored = _hash_password("mysecretpass")
+    assert _verify_password("mysecretpass", stored) is True
+
+
+def test_hash_and_verify_password_returns_false_for_wrong_password():
+    """_hash_password + _verify_password: wrong password returns False."""
+    from backend.main import _hash_password, _verify_password
+    stored = _hash_password("mysecretpass")
+    assert _verify_password("wrongpassword", stored) is False
+
+
+def test_verify_password_returns_false_for_malformed_hash():
+    """_verify_password returns False (not exception) for a malformed hash string."""
+    from backend.main import _verify_password
+    assert _verify_password("anypassword", "not-a-valid-hash") is False
diff --git a/tests/test_biz_002.py b/tests/test_biz_002.py
new file mode 100644
index 0000000..0136df7
--- /dev/null
+++ b/tests/test_biz_002.py
@@ -0,0 +1,203 @@
+"""
+Tests for BATON-BIZ-002: Убрать hardcoded VAPID key из meta-тега, читать с /api/push/public-key
+
+Acceptance criteria:
+1. Meta-тег vapid-public-key полностью отсутствует в frontend/index.html (decision #1333).
+2. app.js использует canonical URL /api/push/public-key для получения VAPID ключа.
+3. Graceful fallback: endpoint недоступен → функция возвращает null, не бросает исключение.
+4. Graceful fallback: ключ пустой → _initPushSubscription не выполняется (guard на null).
+5. GET /api/push/public-key возвращает HTTP 200 с полем vapid_public_key.
+6. GET /api/push/public-key возвращает правильное значение из конфига.
+"""
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+from unittest.mock import patch
+
+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")
+os.environ.setdefault("ADMIN_CHAT_ID", "5694335584")
+
+import pytest
+
+from tests.conftest import make_app_client
+
+PROJECT_ROOT = Path(__file__).parent.parent
+INDEX_HTML = PROJECT_ROOT / "frontend" / "index.html"
+APP_JS = PROJECT_ROOT / "frontend" / "app.js"
+
+_TEST_VAPID_KEY = "BFakeVapidPublicKeyForBiz002TestingBase64UrlEncoded"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — AST: meta-тег vapid-public-key полностью отсутствует
+# ---------------------------------------------------------------------------
+
+
+def test_index_html_has_no_meta_tag_named_vapid_public_key() -> None:
+    """index.html не должен содержать <meta name='vapid-public-key'> вообще (decision #1333)."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    match = re.search(
+        r'<meta[^>]+name\s*=\s*["\']vapid-public-key["\']',
+        content,
+        re.IGNORECASE,
+    )
+    assert match is None, (
+        f"index.html содержит удалённый тег <meta name='vapid-public-key'>: {match.group(0)!r}"
+    )
+
+
+def test_index_html_has_no_vapid_meta_tag_with_empty_or_any_content() -> None:
+    """index.html не должен содержать ни пустой, ни непустой VAPID ключ в meta content."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    match = re.search(
+        r'<meta[^>]*(?:vapid|application-server-key)[^>]*content\s*=',
+        content,
+        re.IGNORECASE,
+    )
+    assert match is None, (
+        f"index.html содержит <meta>-тег с VAPID-связанным атрибутом content: {match.group(0)!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — AST: app.js использует canonical /api/push/public-key
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_fetch_vapid_uses_canonical_push_public_key_url() -> None:
+    """_fetchVapidPublicKey в app.js должна использовать /api/push/public-key (canonical URL)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "/api/push/public-key" in content, (
+        "app.js не содержит canonical URL '/api/push/public-key' — "
+        "ключ не читается через правильный endpoint"
+    )
+
+
+def test_app_js_fetch_vapid_returns_vapid_public_key_field() -> None:
+    """_fetchVapidPublicKey должна читать поле vapid_public_key из JSON-ответа."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(r"data\.vapid_public_key", content), (
+        "app.js не читает поле 'data.vapid_public_key' из ответа API"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — AST: graceful fallback когда endpoint недоступен
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_fetch_vapid_returns_null_on_http_error() -> None:
+    """_fetchVapidPublicKey должна возвращать null при res.ok === false (HTTP-ошибка)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(r"if\s*\(\s*!\s*res\.ok\s*\)", content), (
+        "app.js не содержит проверку 'if (!res.ok)' — "
+        "HTTP-ошибки не обрабатываются gracefully в _fetchVapidPublicKey"
+    )
+
+
+def test_app_js_fetch_vapid_catches_network_errors() -> None:
+    """_fetchVapidPublicKey должна оборачивать fetch в try/catch и возвращать null при сетевой ошибке."""
+    content = APP_JS.read_text(encoding="utf-8")
+    # Проверяем паттерн try { fetch ... } catch (err) { return null; } внутри функции
+    func_match = re.search(
+        r"async function _fetchVapidPublicKey\(\).*?(?=^(?:async )?function |\Z)",
+        content,
+        re.DOTALL | re.MULTILINE,
+    )
+    assert func_match, "Функция _fetchVapidPublicKey не найдена в app.js"
+    func_body = func_match.group(0)
+    assert "catch" in func_body, (
+        "app.js: _fetchVapidPublicKey не содержит блок catch — "
+        "сетевые ошибки при fetch не обрабатываются"
+    )
+    assert re.search(r"return\s+null", func_body), (
+        "app.js: _fetchVapidPublicKey не возвращает null при ошибке — "
+        "upstream код получит исключение вместо null"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — AST: graceful fallback когда ключ пустой (decision #1332)
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_fetch_vapid_returns_null_on_empty_key() -> None:
+    """_fetchVapidPublicKey должна возвращать null когда vapid_public_key пустой."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(r"data\.vapid_public_key\s*\|\|\s*null", content), (
+        "app.js не содержит 'data.vapid_public_key || null' — "
+        "пустой ключ не преобразуется в null"
+    )
+
+
+def test_app_js_init_push_subscription_guard_skips_on_null_key() -> None:
+    """_initPushSubscription должна ранним возвратом пропускать подписку при null ключе (decision #1332)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(r"if\s*\(\s*!\s*vapidPublicKey\s*\)", content), (
+        "app.js: _initPushSubscription не содержит guard 'if (!vapidPublicKey)' — "
+        "подписка может быть создана без ключа"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5 — HTTP: GET /api/push/public-key → 200 + vapid_public_key
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_push_public_key_endpoint_returns_200() -> None:
+    """GET /api/push/public-key должен вернуть HTTP 200."""
+    async with make_app_client() as client:
+        response = await client.get("/api/push/public-key")
+    assert response.status_code == 200, (
+        f"GET /api/push/public-key вернул {response.status_code}, ожидался 200"
+    )
+
+
+@pytest.mark.asyncio
+async def test_push_public_key_endpoint_returns_json_with_vapid_field() -> None:
+    """GET /api/push/public-key должен вернуть JSON с полем vapid_public_key."""
+    async with make_app_client() as client:
+        response = await client.get("/api/push/public-key")
+    data = response.json()
+    assert "vapid_public_key" in data, (
+        f"Ответ /api/push/public-key не содержит поле 'vapid_public_key': {data!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 6 — HTTP: возвращает правильное значение из конфига
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_push_public_key_endpoint_returns_configured_value() -> None:
+    """GET /api/push/public-key возвращает значение из VAPID_PUBLIC_KEY конфига."""
+    with patch("backend.config.VAPID_PUBLIC_KEY", _TEST_VAPID_KEY):
+        async with make_app_client() as client:
+            response = await client.get("/api/push/public-key")
+    data = response.json()
+    assert data.get("vapid_public_key") == _TEST_VAPID_KEY, (
+        f"vapid_public_key должен быть '{_TEST_VAPID_KEY}', "
+        f"получили: {data.get('vapid_public_key')!r}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_push_public_key_endpoint_returns_empty_string_when_not_configured() -> None:
+    """GET /api/push/public-key возвращает пустую строку (не ошибку) если ключ не настроен."""
+    with patch("backend.config.VAPID_PUBLIC_KEY", ""):
+        async with make_app_client() as client:
+            response = await client.get("/api/push/public-key")
+    assert response.status_code == 200, (
+        f"Endpoint вернул {response.status_code} при пустом ключе, ожидался 200"
+    )
+    data = response.json()
+    assert "vapid_public_key" in data, "Поле vapid_public_key отсутствует при пустом конфиге"
diff --git a/tests/test_biz_004.py b/tests/test_biz_004.py
new file mode 100644
index 0000000..228f2ac
--- /dev/null
+++ b/tests/test_biz_004.py
@@ -0,0 +1,96 @@
+"""
+BATON-BIZ-004: Verify removal of dead code from backend/telegram.py.
+
+Acceptance criteria:
+1. telegram.py does NOT contain duplicate logging setLevel calls for httpx/httpcore.
+2. telegram.py does NOT contain the SignalAggregator class.
+3. httpx/httpcore logging suppression is still configured in main.py (globally).
+4. SignalAggregator is NOT importable from backend.telegram.
+"""
+from __future__ import annotations
+
+import ast
+import importlib
+import inspect
+import logging
+import os
+from pathlib import Path
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+_BACKEND_DIR = Path(__file__).parent.parent / "backend"
+_TELEGRAM_SRC = (_BACKEND_DIR / "telegram.py").read_text(encoding="utf-8")
+_MAIN_SRC = (_BACKEND_DIR / "main.py").read_text(encoding="utf-8")
+
+
+# ---------------------------------------------------------------------------
+# Criteria 1 — no setLevel for httpx/httpcore in telegram.py
+# ---------------------------------------------------------------------------
+
+def test_telegram_has_no_httpx_setlevel():
+    """telegram.py must not set log level for 'httpx'."""
+    assert 'getLogger("httpx").setLevel' not in _TELEGRAM_SRC
+    assert "getLogger('httpx').setLevel" not in _TELEGRAM_SRC
+
+
+def test_telegram_has_no_httpcore_setlevel():
+    """telegram.py must not set log level for 'httpcore'."""
+    assert 'getLogger("httpcore").setLevel' not in _TELEGRAM_SRC
+    assert "getLogger('httpcore').setLevel" not in _TELEGRAM_SRC
+
+
+# ---------------------------------------------------------------------------
+# Criteria 2 — SignalAggregator absent from telegram.py source
+# ---------------------------------------------------------------------------
+
+def test_telegram_source_has_no_signal_aggregator_class():
+    """telegram.py source text must not contain the class definition."""
+    assert "class SignalAggregator" not in _TELEGRAM_SRC
+
+
+def test_telegram_source_has_no_signal_aggregator_reference():
+    """telegram.py source text must not reference SignalAggregator at all."""
+    assert "SignalAggregator" not in _TELEGRAM_SRC
+
+
+# ---------------------------------------------------------------------------
+# Criteria 3 — httpx/httpcore suppression still lives in main.py
+# ---------------------------------------------------------------------------
+
+def test_main_suppresses_httpx_logging():
+    """main.py must call getLogger('httpx').setLevel to suppress noise."""
+    assert (
+        'getLogger("httpx").setLevel' in _MAIN_SRC
+        or "getLogger('httpx').setLevel" in _MAIN_SRC
+    )
+
+
+def test_main_suppresses_httpcore_logging():
+    """main.py must call getLogger('httpcore').setLevel to suppress noise."""
+    assert (
+        'getLogger("httpcore").setLevel' in _MAIN_SRC
+        or "getLogger('httpcore').setLevel" in _MAIN_SRC
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criteria 4 — SignalAggregator not importable from backend.telegram
+# ---------------------------------------------------------------------------
+
+def test_signal_aggregator_not_importable_from_telegram():
+    """Importing SignalAggregator from backend.telegram must raise ImportError."""
+    import importlib
+    import sys
+
+    # Force a fresh import so changes to the module are reflected
+    mod_name = "backend.telegram"
+    if mod_name in sys.modules:
+        del sys.modules[mod_name]
+
+    import backend.telegram as tg_mod  # noqa: F401
+    assert not hasattr(tg_mod, "SignalAggregator"), (
+        "SignalAggregator should not be an attribute of backend.telegram"
+    )
diff --git a/tests/test_fix_016.py b/tests/test_fix_016.py
new file mode 100644
index 0000000..e4748ba
--- /dev/null
+++ b/tests/test_fix_016.py
@@ -0,0 +1,163 @@
+"""
+Tests for BATON-FIX-016: VAPID public key — убедиться, что ключ не вшит
+как пустая строка в frontend-коде и читается через API.
+
+Acceptance criteria:
+1. В frontend-коде нет хардкода пустой строки в качестве VAPID key в <meta>-теге.
+2. frontend читает ключ через API /api/vapid-public-key (_fetchVapidPublicKey).
+3. GET /api/vapid-public-key возвращает HTTP 200.
+4. GET /api/vapid-public-key возвращает JSON с полем vapid_public_key.
+5. При наличии конфигурации VAPID_PUBLIC_KEY — ответ содержит непустое значение.
+"""
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+from unittest.mock import patch
+
+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")
+os.environ.setdefault("ADMIN_CHAT_ID", "5694335584")
+
+import pytest
+
+from tests.conftest import make_app_client
+
+PROJECT_ROOT = Path(__file__).parent.parent
+FRONTEND_DIR = PROJECT_ROOT / "frontend"
+INDEX_HTML = FRONTEND_DIR / "index.html"
+APP_JS = FRONTEND_DIR / "app.js"
+
+_TEST_VAPID_PUBLIC_KEY = "BFakeVapidPublicKeyForTestingPurposesOnlyBase64UrlEncoded"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — AST: no hardcoded empty VAPID key in <meta> tag (index.html)
+# ---------------------------------------------------------------------------
+
+
+def test_index_html_has_no_vapid_meta_tag_with_empty_content() -> None:
+    """index.html не должен содержать <meta>-тег с application-server-key и пустым content."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    match = re.search(
+        r'<meta[^>]*(?:application-server-key|vapid)[^>]*content\s*=\s*["\']["\']',
+        content,
+        re.IGNORECASE,
+    )
+    assert match is None, (
+        f"index.html содержит <meta>-тег с пустым VAPID ключом: {match.group(0)!r}"
+    )
+
+
+def test_index_html_has_no_hardcoded_application_server_key_attribute() -> None:
+    """index.html не должен содержать атрибут application-server-key вообще."""
+    content = INDEX_HTML.read_text(encoding="utf-8")
+    assert "application-server-key" not in content.lower(), (
+        "index.html содержит атрибут 'application-server-key' — "
+        "VAPID ключ не должен быть вшит в HTML"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — AST: frontend reads key through API (app.js)
+# ---------------------------------------------------------------------------
+
+
+def test_app_js_contains_fetch_vapid_public_key_function() -> None:
+    """app.js должен содержать функцию _fetchVapidPublicKey."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "_fetchVapidPublicKey" in content, (
+        "app.js не содержит функцию _fetchVapidPublicKey — "
+        "чтение VAPID ключа через API не реализовано"
+    )
+
+
+def test_app_js_fetch_vapid_calls_api_endpoint() -> None:
+    """_fetchVapidPublicKey в app.js должна обращаться к /api/push/public-key (canonical URL)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert "/api/push/public-key" in content, (
+        "app.js не содержит URL '/api/push/public-key' — VAPID ключ не читается через API"
+    )
+
+
+def test_app_js_init_push_subscription_has_null_guard() -> None:
+    """_initPushSubscription в app.js должна содержать guard против null ключа."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(r"if\s*\(\s*!\s*vapidPublicKey\s*\)", content), (
+        "app.js: _initPushSubscription не содержит guard 'if (!vapidPublicKey)' — "
+        "подписка может быть создана без ключа"
+    )
+
+
+def test_app_js_init_chains_fetch_vapid_then_init_subscription() -> None:
+    """_init() в app.js должна вызывать _fetchVapidPublicKey().then(_initPushSubscription)."""
+    content = APP_JS.read_text(encoding="utf-8")
+    assert re.search(
+        r"_fetchVapidPublicKey\(\)\s*\.\s*then\s*\(\s*_initPushSubscription\s*\)",
+        content,
+    ), (
+        "app.js: _init() не содержит цепочку _fetchVapidPublicKey().then(_initPushSubscription)"
+    )
+
+
+def test_app_js_has_no_empty_string_hardcoded_as_application_server_key() -> None:
+    """app.js не должен содержать хардкода пустой строки для applicationServerKey."""
+    content = APP_JS.read_text(encoding="utf-8")
+    match = re.search(r"applicationServerKey\s*[=:]\s*[\"']{2}", content)
+    assert match is None, (
+        f"app.js содержит хардкод пустой строки для applicationServerKey: {match.group(0)!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — HTTP: GET /api/vapid-public-key returns 200
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_vapid_public_key_endpoint_returns_200() -> None:
+    """GET /api/vapid-public-key должен вернуть HTTP 200."""
+    async with make_app_client() as client:
+        response = await client.get("/api/vapid-public-key")
+    assert response.status_code == 200, (
+        f"GET /api/vapid-public-key вернул {response.status_code}, ожидался 200"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — HTTP: response JSON contains vapid_public_key field
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_vapid_public_key_endpoint_returns_json_with_field() -> None:
+    """GET /api/vapid-public-key должен вернуть JSON с полем vapid_public_key."""
+    async with make_app_client() as client:
+        response = await client.get("/api/vapid-public-key")
+    data = response.json()
+    assert "vapid_public_key" in data, (
+        f"Ответ /api/vapid-public-key не содержит поле 'vapid_public_key': {data!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5 — HTTP: non-empty vapid_public_key when env var is configured
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_vapid_public_key_endpoint_returns_configured_value() -> None:
+    """GET /api/vapid-public-key возвращает непустой ключ, когда VAPID_PUBLIC_KEY задан."""
+    with patch("backend.config.VAPID_PUBLIC_KEY", _TEST_VAPID_PUBLIC_KEY):
+        async with make_app_client() as client:
+            response = await client.get("/api/vapid-public-key")
+    data = response.json()
+    assert data.get("vapid_public_key") == _TEST_VAPID_PUBLIC_KEY, (
+        f"vapid_public_key должен быть '{_TEST_VAPID_PUBLIC_KEY}', "
+        f"получили: {data.get('vapid_public_key')!r}"
+    )
diff --git a/tests/test_telegram.py b/tests/test_telegram.py
index e1467a0..bd46f51 100644
--- a/tests/test_telegram.py
+++ b/tests/test_telegram.py
@@ -1,5 +1,5 @@
 """
-Tests for backend/telegram.py: send_message, set_webhook, SignalAggregator.
+Tests for backend/telegram.py: send_message, set_webhook, validate_bot_token.
 
 NOTE: respx routes must be registered INSIDE the 'with mock:' block to be
 intercepted properly.  Registering them before entering the context does not
@@ -25,8 +25,6 @@ def _safe_aiosqlite_await(self):
 aiosqlite.core.Connection.__await__ = _safe_aiosqlite_await  # type: ignore[method-assign]
 
 import json
-import os as _os
-import tempfile
 from unittest.mock import AsyncMock, patch
 
 import httpx
@@ -34,7 +32,7 @@ import pytest
 import respx
 
 from backend import config
-from backend.telegram import SignalAggregator, send_message, set_webhook, validate_bot_token
+from backend.telegram import send_message, set_webhook, validate_bot_token
 
 
 SEND_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
@@ -186,127 +184,6 @@ async def test_set_webhook_raises_on_non_200():
             await set_webhook(url="https://example.com/webhook", secret="s")
 
 
-# ---------------------------------------------------------------------------
-# SignalAggregator helpers
-# ---------------------------------------------------------------------------
-
-async def _init_db_with_tmp() -> str:
-    """Init a temp-file DB and return its path."""
-    from backend import config as _cfg, db as _db
-    path = tempfile.mktemp(suffix=".db")
-    _cfg.DB_PATH = path
-    await _db.init_db()
-    return path
-
-
-def _cleanup(path: str) -> None:
-    for ext in ("", "-wal", "-shm"):
-        try:
-            _os.unlink(path + ext)
-        except FileNotFoundError:
-            pass
-
-
-# ---------------------------------------------------------------------------
-# SignalAggregator tests
-# ---------------------------------------------------------------------------
-
-@pytest.mark.asyncio
-async def test_aggregator_single_signal_calls_send_message():
-    """Flushing an aggregator with one signal calls send_message once."""
-    path = await _init_db_with_tmp()
-    try:
-        agg = SignalAggregator(interval=9999)
-        await agg.add_signal(
-            user_uuid="a9900001-0000-4000-8000-000000000001",
-            user_name="Alice",
-            timestamp=1742478000000,
-            geo={"lat": 55.0, "lon": 37.0, "accuracy": 10.0},
-            signal_id=1,
-        )
-
-        with respx.mock(assert_all_called=False) as mock:
-            send_route = mock.post(SEND_URL).mock(
-                return_value=httpx.Response(200, json={"ok": True})
-            )
-            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
-                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
-                    await agg.flush()
-
-        assert send_route.call_count == 1
-    finally:
-        _cleanup(path)
-
-
-@pytest.mark.asyncio
-async def test_aggregator_multiple_signals_one_message():
-    """5 signals flushed at once produce exactly one send_message call."""
-    path = await _init_db_with_tmp()
-    try:
-        agg = SignalAggregator(interval=9999)
-        for i in range(5):
-            await agg.add_signal(
-                user_uuid=f"a990000{i}-0000-4000-8000-00000000000{i}",
-                user_name=f"User{i}",
-                timestamp=1742478000000 + i * 1000,
-                geo=None,
-                signal_id=i + 1,
-            )
-
-        with respx.mock(assert_all_called=False) as mock:
-            send_route = mock.post(SEND_URL).mock(
-                return_value=httpx.Response(200, json={"ok": True})
-            )
-            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
-                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
-                    await agg.flush()
-
-        assert send_route.call_count == 1
-    finally:
-        _cleanup(path)
-
-
-@pytest.mark.asyncio
-async def test_aggregator_empty_buffer_no_send():
-    """Flushing an empty aggregator must NOT call send_message."""
-    agg = SignalAggregator(interval=9999)
-
-    # No routes registered — if a POST is made it will raise AllMockedAssertionError
-    with respx.mock(assert_all_called=False) as mock:
-        send_route = mock.post(SEND_URL).mock(
-            return_value=httpx.Response(200, json={"ok": True})
-        )
-        await agg.flush()
-
-    assert send_route.call_count == 0
-
-
-@pytest.mark.asyncio
-async def test_aggregator_buffer_cleared_after_flush():
-    """After flush, the aggregator buffer is empty."""
-    path = await _init_db_with_tmp()
-    try:
-        agg = SignalAggregator(interval=9999)
-        await agg.add_signal(
-            user_uuid="a9900099-0000-4000-8000-000000000099",
-            user_name="Test",
-            timestamp=1742478000000,
-            geo=None,
-            signal_id=99,
-        )
-        assert len(agg._buffer) == 1
-
-        with respx.mock(assert_all_called=False) as mock:
-            mock.post(SEND_URL).mock(return_value=httpx.Response(200, json={"ok": True}))
-            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
-                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
-                    await agg.flush()
-
-        assert len(agg._buffer) == 0
-    finally:
-        _cleanup(path)
-
-
 # ---------------------------------------------------------------------------
 # BATON-007: 400 "chat not found" handling
 # ---------------------------------------------------------------------------
@@ -371,33 +248,3 @@ async def test_send_message_all_5xx_retries_exhausted_does_not_raise():
             # Must not raise — message is dropped, service stays alive
             await send_message("test all retries exhausted")
 
-
-@pytest.mark.asyncio
-async def test_aggregator_unknown_user_shows_uuid_prefix():
-    """If user_name is None, the message shows first 8 chars of uuid."""
-    path = await _init_db_with_tmp()
-    try:
-        agg = SignalAggregator(interval=9999)
-        test_uuid = "abcdef1234567890"
-        await agg.add_signal(
-            user_uuid=test_uuid,
-            user_name=None,
-            timestamp=1742478000000,
-            geo=None,
-            signal_id=1,
-        )
-
-        sent_texts: list[str] = []
-
-        async def _fake_send(text: str) -> None:
-            sent_texts.append(text)
-
-        with patch("backend.telegram.send_message", side_effect=_fake_send):
-            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
-                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
-                    await agg.flush()
-
-        assert len(sent_texts) == 1
-        assert test_uuid[:8] in sent_texts[0]
-    finally:
-        _cleanup(path)