diff --git a/frontend/app.js b/frontend/app.js
index 241694e..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() {
@@ -295,6 +329,75 @@ async function _initPushSubscription(vapidPublicKey) {
   }
 }
 
+// ========== 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() {
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_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
index f91ac3e..e4748ba 100644
--- a/tests/test_fix_016.py
+++ b/tests/test_fix_016.py
@@ -78,10 +78,10 @@ def test_app_js_contains_fetch_vapid_public_key_function() -> None:
 
 
 def test_app_js_fetch_vapid_calls_api_endpoint() -> None:
-    """_fetchVapidPublicKey в app.js должна обращаться к /api/vapid-public-key."""
+    """_fetchVapidPublicKey в app.js должна обращаться к /api/push/public-key (canonical URL)."""
     content = APP_JS.read_text(encoding="utf-8")
-    assert "/api/vapid-public-key" in content, (
-        "app.js не содержит URL '/api/vapid-public-key' — VAPID ключ не читается через API"
+    assert "/api/push/public-key" in content, (
+        "app.js не содержит URL '/api/push/public-key' — VAPID ключ не читается через API"
     )
 
 
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)