diff --git a/backend/config.py b/backend/config.py
index af4d933..40159b0 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -21,3 +21,4 @@ WEBHOOK_URL: str = _require("WEBHOOK_URL")
 WEBHOOK_ENABLED: bool = os.getenv("WEBHOOK_ENABLED", "true").lower() == "true"
 FRONTEND_ORIGIN: str = os.getenv("FRONTEND_ORIGIN", "http://localhost:3000")
 APP_URL: str | None = os.getenv("APP_URL")  # Публичный URL приложения для keep-alive self-ping
+ADMIN_TOKEN: str = _require("ADMIN_TOKEN")
diff --git a/backend/db.py b/backend/db.py
index 4a5ea4b..5acc94c 100644
--- a/backend/db.py
+++ b/backend/db.py
@@ -1,28 +1,37 @@
 from __future__ import annotations
 
-from typing import Optional
+import time
+from contextlib import asynccontextmanager
+from typing import AsyncGenerator, Optional
 import aiosqlite
 
 from backend import config
 
 
-async def _get_conn() -> aiosqlite.Connection:
+@asynccontextmanager
+async def _get_conn() -> AsyncGenerator[aiosqlite.Connection, None]:
     conn = await aiosqlite.connect(config.DB_PATH)
     await conn.execute("PRAGMA journal_mode=WAL")
     await conn.execute("PRAGMA busy_timeout=5000")
     await conn.execute("PRAGMA synchronous=NORMAL")
     conn.row_factory = aiosqlite.Row
-    return conn
+    try:
+        yield conn
+    finally:
+        await conn.close()
 
 
 async def init_db() -> None:
-    async with await _get_conn() as conn:
+    async with _get_conn() as conn:
         await conn.executescript("""
             CREATE TABLE IF NOT EXISTS users (
-                id         INTEGER PRIMARY KEY AUTOINCREMENT,
-                uuid       TEXT UNIQUE NOT NULL,
-                name       TEXT NOT NULL,
-                created_at TEXT DEFAULT (datetime('now'))
+                id            INTEGER PRIMARY KEY AUTOINCREMENT,
+                uuid          TEXT UNIQUE NOT NULL,
+                name          TEXT NOT NULL,
+                is_blocked    INTEGER NOT NULL DEFAULT 0,
+                password_hash TEXT DEFAULT NULL,
+                api_key_hash  TEXT DEFAULT NULL,
+                created_at    TEXT DEFAULT (datetime('now'))
             );
 
             CREATE TABLE IF NOT EXISTS signals (
@@ -52,16 +61,42 @@ async def init_db() -> None:
                 ON signals(created_at);
             CREATE INDEX IF NOT EXISTS idx_batches_status
                 ON telegram_batches(status);
+
+            CREATE TABLE IF NOT EXISTS rate_limits (
+                ip           TEXT NOT NULL PRIMARY KEY,
+                count        INTEGER NOT NULL DEFAULT 0,
+                window_start REAL NOT NULL DEFAULT 0
+            );
         """)
+        # Migrations for existing databases (silently ignore if columns already exist)
+        for stmt in [
+            "ALTER TABLE users ADD COLUMN is_blocked INTEGER NOT NULL DEFAULT 0",
+            "ALTER TABLE users ADD COLUMN password_hash TEXT DEFAULT NULL",
+            "ALTER TABLE users ADD COLUMN api_key_hash TEXT DEFAULT NULL",
+        ]:
+            try:
+                await conn.execute(stmt)
+                await conn.commit()
+            except Exception:
+                pass  # Column already exists
         await conn.commit()
 
 
-async def register_user(uuid: str, name: str) -> dict:
-    async with await _get_conn() as conn:
-        await conn.execute(
-            "INSERT OR IGNORE INTO users (uuid, name) VALUES (?, ?)",
-            (uuid, name),
-        )
+async def register_user(uuid: str, name: str, api_key_hash: Optional[str] = None) -> dict:
+    async with _get_conn() as conn:
+        if api_key_hash is not None:
+            await conn.execute(
+                """
+                INSERT INTO users (uuid, name, api_key_hash) VALUES (?, ?, ?)
+                ON CONFLICT(uuid) DO UPDATE SET api_key_hash = excluded.api_key_hash
+                """,
+                (uuid, name, api_key_hash),
+            )
+        else:
+            await conn.execute(
+                "INSERT OR IGNORE INTO users (uuid, name) VALUES (?, ?)",
+                (uuid, name),
+            )
         await conn.commit()
         async with conn.execute(
             "SELECT id, uuid FROM users WHERE uuid = ?", (uuid,)
@@ -70,6 +105,15 @@ async def register_user(uuid: str, name: str) -> dict:
     return {"user_id": row["id"], "uuid": row["uuid"]}
 
 
+async def get_api_key_hash_by_uuid(uuid: str) -> Optional[str]:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "SELECT api_key_hash FROM users WHERE uuid = ?", (uuid,)
+        ) as cur:
+            row = await cur.fetchone()
+    return row["api_key_hash"] if row else None
+
+
 async def save_signal(
     user_uuid: str,
     timestamp: int,
@@ -77,7 +121,7 @@ async def save_signal(
     lon: Optional[float],
     accuracy: Optional[float],
 ) -> int:
-    async with await _get_conn() as conn:
+    async with _get_conn() as conn:
         async with conn.execute(
             """
             INSERT INTO signals (user_uuid, timestamp, lat, lon, accuracy)
@@ -91,7 +135,7 @@ async def save_signal(
 
 
 async def get_user_name(uuid: str) -> Optional[str]:
-    async with await _get_conn() as conn:
+    async with _get_conn() as conn:
         async with conn.execute(
             "SELECT name FROM users WHERE uuid = ?", (uuid,)
         ) as cur:
@@ -99,12 +143,153 @@ async def get_user_name(uuid: str) -> Optional[str]:
     return row["name"] if row else None
 
 
+async def is_user_blocked(uuid: str) -> bool:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "SELECT is_blocked FROM users WHERE uuid = ?", (uuid,)
+        ) as cur:
+            row = await cur.fetchone()
+    return bool(row["is_blocked"]) if row else False
+
+
+async def admin_list_users() -> list[dict]:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "SELECT id, uuid, name, is_blocked, created_at FROM users ORDER BY id"
+        ) as cur:
+            rows = await cur.fetchall()
+    return [
+        {
+            "id": row["id"],
+            "uuid": row["uuid"],
+            "name": row["name"],
+            "is_blocked": bool(row["is_blocked"]),
+            "created_at": row["created_at"],
+        }
+        for row in rows
+    ]
+
+
+async def admin_get_user_by_id(user_id: int) -> Optional[dict]:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "SELECT id, uuid, name, is_blocked, created_at FROM users WHERE id = ?",
+            (user_id,),
+        ) as cur:
+            row = await cur.fetchone()
+    if row is None:
+        return None
+    return {
+        "id": row["id"],
+        "uuid": row["uuid"],
+        "name": row["name"],
+        "is_blocked": bool(row["is_blocked"]),
+        "created_at": row["created_at"],
+    }
+
+
+async def admin_create_user(
+    uuid: str, name: str, password_hash: Optional[str] = None
+) -> Optional[dict]:
+    """Returns None if UUID already exists."""
+    async with _get_conn() as conn:
+        try:
+            async with conn.execute(
+                "INSERT INTO users (uuid, name, password_hash) VALUES (?, ?, ?)",
+                (uuid, name, password_hash),
+            ) as cur:
+                new_id = cur.lastrowid
+        except Exception:
+            return None  # UNIQUE constraint violation — UUID already exists
+        await conn.commit()
+        async with conn.execute(
+            "SELECT id, uuid, name, is_blocked, created_at FROM users WHERE id = ?",
+            (new_id,),
+        ) as cur:
+            row = await cur.fetchone()
+    return {
+        "id": row["id"],
+        "uuid": row["uuid"],
+        "name": row["name"],
+        "is_blocked": bool(row["is_blocked"]),
+        "created_at": row["created_at"],
+    }
+
+
+async def admin_set_password(user_id: int, password_hash: str) -> bool:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "UPDATE users SET password_hash = ? WHERE id = ?",
+            (password_hash, user_id),
+        ) as cur:
+            changed = cur.rowcount > 0
+        await conn.commit()
+    return changed
+
+
+async def admin_set_blocked(user_id: int, is_blocked: bool) -> bool:
+    async with _get_conn() as conn:
+        async with conn.execute(
+            "UPDATE users SET is_blocked = ? WHERE id = ?",
+            (1 if is_blocked else 0, user_id),
+        ) as cur:
+            changed = cur.rowcount > 0
+        await conn.commit()
+    return changed
+
+
+async def admin_delete_user(user_id: int) -> bool:
+    async with _get_conn() as conn:
+        # Delete signals first (no FK cascade in SQLite by default)
+        async with conn.execute(
+            "DELETE FROM signals WHERE user_uuid = (SELECT uuid FROM users WHERE id = ?)",
+            (user_id,),
+        ):
+            pass
+        async with conn.execute(
+            "DELETE FROM users WHERE id = ?",
+            (user_id,),
+        ) as cur:
+            changed = cur.rowcount > 0
+        await conn.commit()
+    return changed
+
+
+async def rate_limit_increment(key: str, window: float) -> int:
+    """Increment rate-limit counter for key within window. Returns current count.
+
+    Cleans up the stale record for this key before incrementing (TTL by window_start).
+    """
+    now = time.time()
+    async with _get_conn() as conn:
+        # TTL cleanup: remove stale record for this key if window has expired
+        await conn.execute(
+            "DELETE FROM rate_limits WHERE ip = ? AND ? - window_start >= ?",
+            (key, now, window),
+        )
+        # Upsert: insert new record or increment existing
+        await conn.execute(
+            """
+            INSERT INTO rate_limits (ip, count, window_start)
+            VALUES (?, 1, ?)
+            ON CONFLICT(ip) DO UPDATE SET count = count + 1
+            """,
+            (key, now),
+        )
+        await conn.commit()
+        async with conn.execute(
+            "SELECT count FROM rate_limits WHERE ip = ?", (key,)
+        ) as cur:
+            row = await cur.fetchone()
+    return row["count"] if row else 1
+
+
 async def save_telegram_batch(
     message_text: str,
     signals_count: int,
     signal_ids: list[int],
 ) -> int:
-    async with await _get_conn() as conn:
+    async with _get_conn() as conn:
         async with conn.execute(
             """
             INSERT INTO telegram_batches (message_text, sent_at, signals_count, status)
diff --git a/backend/main.py b/backend/main.py
index 025d69d..7fb9d19 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -1,29 +1,52 @@
 from __future__ import annotations
 
 import asyncio
+import hashlib
 import logging
-import time
+import os
+import secrets
 from contextlib import asynccontextmanager
 from datetime import datetime, timezone
-from typing import Any
+from typing import Any, Optional
 
 import httpx
-from fastapi import Depends, FastAPI, Request
+from fastapi import Depends, FastAPI, HTTPException, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
 from backend import config, db, telegram
-from backend.middleware import rate_limit_register, verify_webhook_secret
+from backend.middleware import rate_limit_register, rate_limit_signal, verify_admin_token, verify_webhook_secret
 from backend.models import (
+    AdminBlockRequest,
+    AdminCreateUserRequest,
+    AdminSetPasswordRequest,
     RegisterRequest,
     RegisterResponse,
     SignalRequest,
     SignalResponse,
 )
 
+_api_key_bearer = HTTPBearer(auto_error=False)
+
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
+
+def _hash_api_key(key: str) -> str:
+    """SHA-256 хэш для API-ключа (без соли — для быстрого сравнения)."""
+    return hashlib.sha256(key.encode()).hexdigest()
+
+
+def _hash_password(password: str) -> str:
+    """Hash a password using PBKDF2-HMAC-SHA256 (stdlib, no external deps).
+
+    Stored format: ``<salt_hex>:<dk_hex>``
+    """
+    salt = os.urandom(16)
+    dk = hashlib.pbkdf2_hmac("sha256", password.encode("utf-8"), salt, 260_000)
+    return f"{salt.hex()}:{dk.hex()}"
+
 # aggregator = telegram.SignalAggregator(interval=10)  # v2.0 feature — отключено в v1 (ADR-004)
 
 _KEEPALIVE_INTERVAL = 600  # 10 минут
@@ -45,10 +68,14 @@ async def _keep_alive_loop(app_url: str) -> None:
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     # Startup
-    app.state.rate_counters = {}
     await db.init_db()
     logger.info("Database initialized")
 
+    if not await telegram.validate_bot_token():
+        logger.error(
+            "CRITICAL: BOT_TOKEN is invalid — Telegram delivery is broken. Update .env and restart."
+        )
+
     if config.WEBHOOK_ENABLED:
         await telegram.set_webhook(url=config.WEBHOOK_URL, secret=config.WEBHOOK_SECRET)
         logger.info("Webhook registered")
@@ -91,23 +118,39 @@ app.add_middleware(
     CORSMiddleware,
     allow_origins=[config.FRONTEND_ORIGIN],
     allow_methods=["POST"],
-    allow_headers=["Content-Type"],
+    allow_headers=["Content-Type", "Authorization"],
 )
 
 
 @app.get("/health")
+@app.get("/api/health")
 async def health() -> dict[str, Any]:
-    return {"status": "ok", "timestamp": int(time.time())}
+    return {"status": "ok"}
 
 
 @app.post("/api/register", response_model=RegisterResponse)
 async def register(body: RegisterRequest, _: None = Depends(rate_limit_register)) -> RegisterResponse:
-    result = await db.register_user(uuid=body.uuid, name=body.name)
-    return RegisterResponse(user_id=result["user_id"], uuid=result["uuid"])
+    api_key = secrets.token_hex(32)
+    result = await db.register_user(uuid=body.uuid, name=body.name, api_key_hash=_hash_api_key(api_key))
+    return RegisterResponse(user_id=result["user_id"], uuid=result["uuid"], api_key=api_key)
 
 
 @app.post("/api/signal", response_model=SignalResponse)
-async def signal(body: SignalRequest) -> SignalResponse:
+async def signal(
+    body: SignalRequest,
+    credentials: Optional[HTTPAuthorizationCredentials] = Depends(_api_key_bearer),
+    _: None = Depends(rate_limit_signal),
+) -> SignalResponse:
+    if credentials is None:
+        raise HTTPException(status_code=401, detail="Unauthorized")
+    key_hash = _hash_api_key(credentials.credentials)
+    stored_hash = await db.get_api_key_hash_by_uuid(body.user_id)
+    if stored_hash is None or not secrets.compare_digest(key_hash, stored_hash):
+        raise HTTPException(status_code=401, detail="Unauthorized")
+
+    if await db.is_user_blocked(body.user_id):
+        raise HTTPException(status_code=403, detail="User is blocked")
+
     geo = body.geo
     lat = geo.lat if geo else None
     lon = geo.lon if geo else None
@@ -134,11 +177,49 @@ async def signal(body: SignalRequest) -> SignalResponse:
         f"⏰ {ts.strftime('%H:%M:%S')} UTC\n"
         f"{geo_info}"
     )
-    await telegram.send_message(text)
+    asyncio.create_task(telegram.send_message(text))
 
     return SignalResponse(status="ok", signal_id=signal_id)
 
 
+@app.get("/admin/users", dependencies=[Depends(verify_admin_token)])
+async def admin_list_users() -> list[dict]:
+    return await db.admin_list_users()
+
+
+@app.post("/admin/users", status_code=201, dependencies=[Depends(verify_admin_token)])
+async def admin_create_user(body: AdminCreateUserRequest) -> dict:
+    password_hash = _hash_password(body.password) if body.password else None
+    result = await db.admin_create_user(body.uuid, body.name, password_hash)
+    if result is None:
+        raise HTTPException(status_code=409, detail="User with this UUID already exists")
+    return result
+
+
+@app.put("/admin/users/{user_id}/password", dependencies=[Depends(verify_admin_token)])
+async def admin_set_password(user_id: int, body: AdminSetPasswordRequest) -> dict:
+    changed = await db.admin_set_password(user_id, _hash_password(body.password))
+    if not changed:
+        raise HTTPException(status_code=404, detail="User not found")
+    return {"ok": True}
+
+
+@app.put("/admin/users/{user_id}/block", dependencies=[Depends(verify_admin_token)])
+async def admin_block_user(user_id: int, body: AdminBlockRequest) -> dict:
+    changed = await db.admin_set_blocked(user_id, body.is_blocked)
+    if not changed:
+        raise HTTPException(status_code=404, detail="User not found")
+    user = await db.admin_get_user_by_id(user_id)
+    return user  # type: ignore[return-value]
+
+
+@app.delete("/admin/users/{user_id}", status_code=204, dependencies=[Depends(verify_admin_token)])
+async def admin_delete_user(user_id: int) -> None:
+    deleted = await db.admin_delete_user(user_id)
+    if not deleted:
+        raise HTTPException(status_code=404, detail="User not found")
+
+
 @app.post("/api/webhook/telegram")
 async def webhook_telegram(
     request: Request,
diff --git a/backend/middleware.py b/backend/middleware.py
index 34d913e..b91b83e 100644
--- a/backend/middleware.py
+++ b/backend/middleware.py
@@ -1,15 +1,29 @@
 from __future__ import annotations
 
 import secrets
-import time
+from typing import Optional
 
-from fastapi import Header, HTTPException, Request
+from fastapi import Depends, Header, HTTPException, Request
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
-from backend import config
+from backend import config, db
+
+_bearer = HTTPBearer(auto_error=False)
 
 _RATE_LIMIT = 5
 _RATE_WINDOW = 600  # 10 minutes
 
+_SIGNAL_RATE_LIMIT = 10
+_SIGNAL_RATE_WINDOW = 60  # 1 minute
+
+
+def _get_client_ip(request: Request) -> str:
+    return (
+        request.headers.get("X-Real-IP")
+        or request.headers.get("X-Forwarded-For", "").split(",")[0].strip()
+        or (request.client.host if request.client else "unknown")
+    )
+
 
 async def verify_webhook_secret(
     x_telegram_bot_api_secret_token: str = Header(default=""),
@@ -20,15 +34,24 @@ async def verify_webhook_secret(
         raise HTTPException(status_code=403, detail="Forbidden")
 
 
+async def verify_admin_token(
+    credentials: Optional[HTTPAuthorizationCredentials] = Depends(_bearer),
+) -> None:
+    if credentials is None or not secrets.compare_digest(
+        credentials.credentials, config.ADMIN_TOKEN
+    ):
+        raise HTTPException(status_code=401, detail="Unauthorized")
+
+
 async def rate_limit_register(request: Request) -> None:
-    counters = request.app.state.rate_counters
-    client_ip = request.client.host if request.client else "unknown"
-    now = time.time()
-    count, window_start = counters.get(client_ip, (0, now))
-    if now - window_start >= _RATE_WINDOW:
-        count = 0
-        window_start = now
-    count += 1
-    counters[client_ip] = (count, window_start)
+    key = f"reg:{_get_client_ip(request)}"
+    count = await db.rate_limit_increment(key, _RATE_WINDOW)
     if count > _RATE_LIMIT:
         raise HTTPException(status_code=429, detail="Too Many Requests")
+
+
+async def rate_limit_signal(request: Request) -> None:
+    key = f"sig:{_get_client_ip(request)}"
+    count = await db.rate_limit_increment(key, _SIGNAL_RATE_WINDOW)
+    if count > _SIGNAL_RATE_LIMIT:
+        raise HTTPException(status_code=429, detail="Too Many Requests")
diff --git a/backend/models.py b/backend/models.py
index 68265de..7b88b20 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -5,13 +5,14 @@ from pydantic import BaseModel, Field
 
 
 class RegisterRequest(BaseModel):
-    uuid: str = Field(..., min_length=1)
+    uuid: str = Field(..., pattern=r'^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$')
     name: str = Field(..., min_length=1, max_length=100)
 
 
 class RegisterResponse(BaseModel):
     user_id: int
     uuid: str
+    api_key: str
 
 
 class GeoData(BaseModel):
@@ -21,7 +22,7 @@ class GeoData(BaseModel):
 
 
 class SignalRequest(BaseModel):
-    user_id: str = Field(..., min_length=1)
+    user_id: str = Field(..., pattern=r'^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$')
     timestamp: int = Field(..., gt=0)
     geo: Optional[GeoData] = None
 
@@ -29,3 +30,17 @@ class SignalRequest(BaseModel):
 class SignalResponse(BaseModel):
     status: str
     signal_id: int
+
+
+class AdminCreateUserRequest(BaseModel):
+    uuid: str = Field(..., min_length=1)
+    name: str = Field(..., min_length=1, max_length=100)
+    password: Optional[str] = None
+
+
+class AdminSetPasswordRequest(BaseModel):
+    password: str = Field(..., min_length=1)
+
+
+class AdminBlockRequest(BaseModel):
+    is_blocked: bool
diff --git a/backend/telegram.py b/backend/telegram.py
index 0436dea..0633462 100644
--- a/backend/telegram.py
+++ b/backend/telegram.py
@@ -14,27 +14,45 @@ logger = logging.getLogger(__name__)
 _TELEGRAM_API = "https://api.telegram.org/bot{token}/{method}"
 
 
+async def validate_bot_token() -> bool:
+    """Validate BOT_TOKEN by calling getMe. Logs ERROR if invalid. Never raises."""
+    url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="getMe")
+    async with httpx.AsyncClient(timeout=10) as client:
+        try:
+            resp = await client.get(url)
+            if resp.status_code == 200:
+                bot_name = resp.json().get("result", {}).get("username", "?")
+                logger.info("Telegram token valid, bot: @%s", bot_name)
+                return True
+            logger.error(
+                "BOT_TOKEN invalid — getMe returned %s: %s", resp.status_code, resp.text
+            )
+            return False
+        except Exception as exc:
+            logger.error("BOT_TOKEN validation failed (network): %s", exc)
+            return False
+
+
 async def send_message(text: str) -> None:
     url = _TELEGRAM_API.format(token=config.BOT_TOKEN, method="sendMessage")
     async with httpx.AsyncClient(timeout=10) as client:
-        while True:
+        for attempt in range(3):
             resp = await client.post(url, json={"chat_id": config.CHAT_ID, "text": text})
             if resp.status_code == 429:
                 retry_after = resp.json().get("parameters", {}).get("retry_after", 30)
-                logger.warning("Telegram 429, sleeping %s sec", retry_after)
-                await asyncio.sleep(retry_after)
+                sleep = retry_after * (attempt + 1)
+                logger.warning("Telegram 429, sleeping %s sec (attempt %d)", sleep, attempt + 1)
+                await asyncio.sleep(sleep)
                 continue
             if resp.status_code >= 500:
                 logger.error("Telegram 5xx: %s", resp.text)
                 await asyncio.sleep(30)
-                resp2 = await client.post(
-                    url, json={"chat_id": config.CHAT_ID, "text": text}
-                )
-                if resp2.status_code != 200:
-                    logger.error("Telegram retry failed: %s", resp2.text)
+                continue
             elif resp.status_code != 200:
                 logger.error("Telegram error %s: %s", resp.status_code, resp.text)
             break
+        else:
+            logger.error("Telegram send_message: all 3 attempts failed, message dropped")
 
 
 async def set_webhook(url: str, secret: str) -> None:
diff --git a/deploy/baton-keepalive.service b/deploy/baton-keepalive.service
index 8ed86fe..49d146d 100644
--- a/deploy/baton-keepalive.service
+++ b/deploy/baton-keepalive.service
@@ -5,6 +5,6 @@ Description=Baton keep-alive ping
 [Service]
 Type=oneshot
 # Замените URL на реальный адрес вашего приложения
-ExecStart=curl -sf https://your-app.example.com/health
+ExecStart=curl -sf https://baton.itafrika.com/health
 StandardOutput=null
 StandardError=journal
diff --git a/deploy/baton.service b/deploy/baton.service
new file mode 100644
index 0000000..141d6b6
--- /dev/null
+++ b/deploy/baton.service
@@ -0,0 +1,18 @@
+[Unit]
+Description=Baton — Telegram bot FastAPI backend
+After=network.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=www-data
+WorkingDirectory=/opt/baton
+EnvironmentFile=/opt/baton/.env
+ExecStart=/opt/baton/venv/bin/uvicorn backend.main:app --host 127.0.0.1 --port 8000
+Restart=on-failure
+RestartSec=5s
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target
diff --git a/deploy/env.template b/deploy/env.template
new file mode 100644
index 0000000..ec9d2ef
--- /dev/null
+++ b/deploy/env.template
@@ -0,0 +1,22 @@
+# /opt/baton/.env — заполнить перед деплоем
+# ВНИМАНИЕ: этот файл НЕ для git, только шаблон для ручного создания на сервере
+
+# Telegram Bot — получить токен через @BotFather
+BOT_TOKEN=YOUR_BOT_TOKEN_HERE
+
+# Chat ID для уведомлений (example: CHAT_ID=5190015988)
+CHAT_ID=
+
+# Webhook secret — случайная строка 32+ символа (сгенерировать: openssl rand -hex 32)
+WEBHOOK_SECRET=
+
+# Webhook URL
+WEBHOOK_URL=https://baton.itafrika.com/api/webhook/telegram
+
+WEBHOOK_ENABLED=true
+FRONTEND_ORIGIN=https://baton.itafrika.com
+APP_URL=https://baton.itafrika.com
+DB_PATH=/opt/baton/baton.db
+
+# Admin API token — случайная строка 32+ символа (сгенерировать: openssl rand -hex 32)
+ADMIN_TOKEN=
diff --git a/frontend/admin.html b/frontend/admin.html
new file mode 100644
index 0000000..8dab73f
--- /dev/null
+++ b/frontend/admin.html
@@ -0,0 +1,379 @@
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Baton — Admin</title>
+  <style>
+    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
+
+    :root {
+      --bg:           #000000;
+      --bg2:          #0d0d0d;
+      --text:         #ffffff;
+      --muted:        #9ca3af;
+      --input-bg:     #1a1a1a;
+      --border:       #374151;
+      --border-focus: #6b7280;
+      --btn-bg:       #374151;
+      --btn-hover:    #4b5563;
+      --danger:       #991b1b;
+      --danger-hover: #7f1d1d;
+      --warn:         #78350f;
+      --warn-hover:   #92400e;
+      --success-bg:   #14532d;
+      --blocked-row:  #1c1008;
+    }
+
+    body {
+      background: var(--bg);
+      color: var(--text);
+      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
+      font-size: 14px;
+      min-height: 100vh;
+    }
+
+    /* ===== Token screen ===== */
+
+    #screen-token {
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      min-height: 100vh;
+      padding: 24px;
+    }
+
+    .login-card {
+      width: 100%;
+      max-width: 360px;
+      background: var(--bg2);
+      border: 1px solid var(--border);
+      border-radius: 16px;
+      padding: 32px 28px;
+      display: flex;
+      flex-direction: column;
+      gap: 16px;
+    }
+
+    .login-title {
+      font-size: 22px;
+      font-weight: 700;
+      text-align: center;
+    }
+
+    .login-subtitle {
+      font-size: 13px;
+      color: var(--muted);
+      text-align: center;
+      margin-top: -8px;
+    }
+
+    /* ===== Panel screen ===== */
+
+    #screen-panel { display: none; flex-direction: column; min-height: 100vh; }
+    #screen-panel.active { display: flex; }
+
+    .panel-header {
+      display: flex;
+      align-items: center;
+      gap: 12px;
+      padding: 16px 20px;
+      border-bottom: 1px solid var(--border);
+      flex-shrink: 0;
+    }
+
+    .panel-title {
+      font-size: 18px;
+      font-weight: 700;
+      flex: 1;
+    }
+
+    .panel-body {
+      flex: 1;
+      overflow: auto;
+      padding: 20px;
+    }
+
+    /* ===== Table ===== */
+
+    .users-wrap {
+      overflow-x: auto;
+    }
+
+    table {
+      width: 100%;
+      border-collapse: collapse;
+      min-width: 600px;
+    }
+
+    thead tr {
+      background: var(--bg2);
+    }
+
+    th {
+      text-align: left;
+      padding: 10px 12px;
+      font-size: 12px;
+      text-transform: uppercase;
+      letter-spacing: 0.06em;
+      color: var(--muted);
+      border-bottom: 1px solid var(--border);
+      white-space: nowrap;
+    }
+
+    td {
+      padding: 10px 12px;
+      border-bottom: 1px solid #1f2937;
+      vertical-align: middle;
+    }
+
+    tr.is-blocked td { background: var(--blocked-row); }
+
+    tr:hover td { background: #111827; }
+    tr.is-blocked:hover td { background: #231508; }
+
+    .col-id    { width: 50px; color: var(--muted); }
+    .col-uuid  { max-width: 120px; font-family: monospace; font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+    .col-date  { white-space: nowrap; color: var(--muted); font-size: 12px; }
+    .col-actions { white-space: nowrap; }
+
+    .empty-row td {
+      text-align: center;
+      color: var(--muted);
+      padding: 32px;
+    }
+
+    /* ===== Badges ===== */
+
+    .badge {
+      display: inline-block;
+      padding: 2px 8px;
+      border-radius: 9999px;
+      font-size: 12px;
+      font-weight: 500;
+    }
+
+    .badge--active  { background: #14532d; color: #4ade80; }
+    .badge--blocked { background: #7f1d1d; color: #fca5a5; }
+
+    /* ===== Inputs ===== */
+
+    input[type="text"],
+    input[type="password"] {
+      width: 100%;
+      padding: 10px 14px;
+      background: var(--input-bg);
+      border: 1.5px solid var(--border);
+      border-radius: 10px;
+      color: var(--text);
+      font-size: 15px;
+      outline: none;
+      transition: border-color 0.15s;
+      -webkit-appearance: none;
+    }
+
+    input::placeholder { color: var(--muted); }
+    input:focus { border-color: var(--border-focus); }
+
+    /* ===== Buttons ===== */
+
+    .btn {
+      padding: 10px 18px;
+      background: var(--btn-bg);
+      border: none;
+      border-radius: 10px;
+      color: var(--text);
+      font-size: 14px;
+      font-weight: 600;
+      cursor: pointer;
+      transition: background 0.15s;
+      white-space: nowrap;
+    }
+
+    .btn:hover:not(:disabled)   { background: var(--btn-hover); }
+    .btn:disabled               { opacity: 0.4; cursor: default; }
+    .btn--full                  { width: 100%; }
+    .btn--danger                { background: var(--danger); }
+    .btn--danger:hover:not(:disabled) { background: var(--danger-hover); }
+
+    /* Small inline buttons */
+    .btn-sm {
+      padding: 4px 10px;
+      background: var(--btn-bg);
+      border: none;
+      border-radius: 6px;
+      color: var(--text);
+      font-size: 12px;
+      font-weight: 500;
+      cursor: pointer;
+      transition: background 0.15s;
+      white-space: nowrap;
+      margin-right: 4px;
+    }
+
+    .btn-sm:last-child { margin-right: 0; }
+    .btn-sm:hover { background: var(--btn-hover); }
+    .btn-sm--danger { background: var(--danger); }
+    .btn-sm--danger:hover { background: var(--danger-hover); }
+    .btn-sm--warn { background: var(--warn); }
+    .btn-sm--warn:hover { background: var(--warn-hover); }
+
+    /* ===== Error / info messages ===== */
+
+    .msg-error {
+      color: #f87171;
+      font-size: 13px;
+      text-align: center;
+    }
+
+    .msg-info {
+      color: var(--muted);
+      font-size: 13px;
+      padding: 12px 0;
+    }
+
+    /* ===== Modals ===== */
+
+    .modal-backdrop {
+      position: fixed;
+      inset: 0;
+      background: rgba(0, 0, 0, 0.75);
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      padding: 24px;
+      z-index: 100;
+    }
+
+    .modal-backdrop[hidden] { display: none; }
+
+    .modal-box {
+      background: var(--bg2);
+      border: 1px solid var(--border);
+      border-radius: 14px;
+      padding: 28px 24px;
+      width: 100%;
+      max-width: 380px;
+      display: flex;
+      flex-direction: column;
+      gap: 14px;
+    }
+
+    .modal-title {
+      font-size: 16px;
+      font-weight: 700;
+    }
+
+    .modal-subtitle {
+      font-size: 13px;
+      color: var(--muted);
+      margin-top: -6px;
+    }
+
+    .modal-actions {
+      display: flex;
+      gap: 10px;
+    }
+
+    .modal-actions .btn { flex: 1; }
+
+    /* ===== Label ===== */
+
+    .field-label {
+      font-size: 12px;
+      color: var(--muted);
+      margin-bottom: 4px;
+    }
+
+    .field { display: flex; flex-direction: column; gap: 4px; }
+  </style>
+</head>
+<body>
+
+  <!-- ===== Token screen ===== -->
+  <div id="screen-token">
+    <div class="login-card">
+      <h1 class="login-title">Baton Admin</h1>
+      <p class="login-subtitle">Введите токен для доступа</p>
+      <input type="password" id="token-input" placeholder="Admin token" autocomplete="current-password">
+      <button type="button" id="btn-login" class="btn btn--full">Войти</button>
+      <p id="login-error" class="msg-error" hidden></p>
+    </div>
+  </div>
+
+  <!-- ===== Admin panel screen ===== -->
+  <div id="screen-panel">
+    <header class="panel-header">
+      <h1 class="panel-title">Пользователи</h1>
+      <button type="button" id="btn-create" class="btn">+ Создать</button>
+      <button type="button" id="btn-logout" class="btn">Выйти</button>
+    </header>
+
+    <div class="panel-body">
+      <p id="panel-error" class="msg-error" hidden></p>
+
+      <div class="users-wrap">
+        <table id="users-table">
+          <thead>
+            <tr>
+              <th class="col-id">#</th>
+              <th>Имя</th>
+              <th class="col-uuid">UUID</th>
+              <th>Статус</th>
+              <th class="col-date">Создан</th>
+              <th class="col-actions">Действия</th>
+            </tr>
+          </thead>
+          <tbody id="users-tbody">
+            <tr class="empty-row"><td colspan="6">Загрузка…</td></tr>
+          </tbody>
+        </table>
+      </div>
+    </div>
+  </div>
+
+  <!-- ===== Modal: change password ===== -->
+  <div id="modal-password" class="modal-backdrop" hidden>
+    <div class="modal-box">
+      <h2 class="modal-title">Сменить пароль</h2>
+      <p id="modal-pw-subtitle" class="modal-subtitle"></p>
+      <input type="hidden" id="modal-pw-user-id">
+      <div class="field">
+        <div class="field-label">Новый пароль</div>
+        <input type="password" id="new-password" placeholder="Минимум 1 символ" autocomplete="new-password">
+      </div>
+      <p id="modal-pw-error" class="msg-error" hidden></p>
+      <div class="modal-actions">
+        <button type="button" id="btn-pw-cancel" class="btn">Отмена</button>
+        <button type="button" id="btn-pw-save" class="btn">Сохранить</button>
+      </div>
+    </div>
+  </div>
+
+  <!-- ===== Modal: create user ===== -->
+  <div id="modal-create" class="modal-backdrop" hidden>
+    <div class="modal-box">
+      <h2 class="modal-title">Создать пользователя</h2>
+      <div class="field">
+        <div class="field-label">UUID</div>
+        <input type="text" id="create-uuid" autocomplete="off" spellcheck="false">
+      </div>
+      <div class="field">
+        <div class="field-label">Имя</div>
+        <input type="text" id="create-name" placeholder="Имя пользователя" autocomplete="off">
+      </div>
+      <div class="field">
+        <div class="field-label">Пароль (необязательно)</div>
+        <input type="password" id="create-password" placeholder="Оставьте пустым если не нужен" autocomplete="new-password">
+      </div>
+      <p id="create-error" class="msg-error" hidden></p>
+      <div class="modal-actions">
+        <button type="button" id="btn-create-cancel" class="btn">Отмена</button>
+        <button type="button" id="btn-create-submit" class="btn">Создать</button>
+      </div>
+    </div>
+  </div>
+
+  <script src="/admin.js"></script>
+</body>
+</html>
diff --git a/frontend/admin.js b/frontend/admin.js
new file mode 100644
index 0000000..7e46b9e
--- /dev/null
+++ b/frontend/admin.js
@@ -0,0 +1,333 @@
+'use strict';
+
+// ========== Token (sessionStorage — cleared on browser close) ==========
+
+function _getToken() {
+  return sessionStorage.getItem('baton_admin_token') || '';
+}
+
+function _saveToken(t) {
+  sessionStorage.setItem('baton_admin_token', t);
+}
+
+function _clearToken() {
+  sessionStorage.removeItem('baton_admin_token');
+}
+
+// ========== API wrapper ==========
+
+async function _api(method, path, body) {
+  const opts = {
+    method,
+    headers: { 'Authorization': 'Bearer ' + _getToken() },
+  };
+  if (body !== undefined) {
+    opts.headers['Content-Type'] = 'application/json';
+    opts.body = JSON.stringify(body);
+  }
+
+  const res = await fetch(path, opts);
+
+  if (res.status === 204) return null;
+
+  const text = await res.text().catch(() => '');
+  if (!res.ok) {
+    let detail = text;
+    try { detail = JSON.parse(text).detail || text; } catch (_) {}
+    throw new Error('HTTP ' + res.status + (detail ? ': ' + detail : ''));
+  }
+
+  try { return JSON.parse(text); } catch (_) { return null; }
+}
+
+// ========== UI helpers ==========
+
+function _esc(str) {
+  return String(str)
+    .replace(/&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;');
+}
+
+function _setError(id, msg) {
+  const el = document.getElementById(id);
+  el.textContent = msg;
+  el.hidden = !msg;
+}
+
+function _showPanel() {
+  document.getElementById('screen-token').style.display = 'none';
+  document.getElementById('screen-panel').classList.add('active');
+}
+
+function _showTokenScreen() {
+  document.getElementById('screen-panel').classList.remove('active');
+  document.getElementById('screen-token').style.display = '';
+  document.getElementById('token-input').value = '';
+}
+
+// ========== Users table ==========
+
+function _renderTable(users) {
+  const tbody = document.getElementById('users-tbody');
+  tbody.innerHTML = '';
+
+  if (!users.length) {
+    const tr = document.createElement('tr');
+    tr.className = 'empty-row';
+    tr.innerHTML = '<td colspan="6">Нет пользователей</td>';
+    tbody.appendChild(tr);
+    return;
+  }
+
+  users.forEach((u) => {
+    const tr = document.createElement('tr');
+    if (u.is_blocked) tr.classList.add('is-blocked');
+
+    const date = u.created_at ? u.created_at.slice(0, 16).replace('T', ' ') : '—';
+    const uuidShort = u.uuid ? u.uuid.slice(0, 8) + '…' : '—';
+
+    tr.innerHTML = `
+      <td class="col-id">${u.id}</td>
+      <td>${_esc(u.name)}</td>
+      <td class="col-uuid" title="${_esc(u.uuid)}">${_esc(uuidShort)}</td>
+      <td>
+        <span class="badge ${u.is_blocked ? 'badge--blocked' : 'badge--active'}">
+          ${u.is_blocked ? 'Заблокирован' : 'Активен'}
+        </span>
+      </td>
+      <td class="col-date">${_esc(date)}</td>
+      <td class="col-actions">
+        <button class="btn-sm"
+          data-action="password"
+          data-id="${u.id}"
+          data-name="${_esc(u.name)}">Пароль</button>
+        <button class="btn-sm ${u.is_blocked ? 'btn-sm--warn' : ''}"
+          data-action="block"
+          data-id="${u.id}"
+          data-blocked="${u.is_blocked ? '1' : '0'}">
+          ${u.is_blocked ? 'Разблокировать' : 'Заблокировать'}
+        </button>
+        <button class="btn-sm btn-sm--danger"
+          data-action="delete"
+          data-id="${u.id}"
+          data-name="${_esc(u.name)}">Удалить</button>
+      </td>
+    `;
+    tbody.appendChild(tr);
+  });
+}
+
+// ========== Load users ==========
+
+async function _loadUsers() {
+  _setError('panel-error', '');
+  try {
+    const users = await _api('GET', '/admin/users');
+    _renderTable(users);
+  } catch (err) {
+    _setError('panel-error', err.message);
+  }
+}
+
+// ========== Login / Logout ==========
+
+async function _handleLogin() {
+  const input = document.getElementById('token-input');
+  const btn = document.getElementById('btn-login');
+  const token = input.value.trim();
+  if (!token) return;
+
+  btn.disabled = true;
+  _setError('login-error', '');
+  _saveToken(token);
+
+  try {
+    const users = await _api('GET', '/admin/users');
+    _renderTable(users);
+    _showPanel();
+  } catch (err) {
+    _clearToken();
+    const msg = err.message.includes('401') ? 'Неверный токен' : err.message;
+    _setError('login-error', msg);
+    btn.disabled = false;
+  }
+}
+
+function _handleLogout() {
+  _clearToken();
+  _showTokenScreen();
+}
+
+// ========== Table action dispatcher (event delegation) ==========
+
+async function _handleTableClick(e) {
+  const btn = e.target.closest('[data-action]');
+  if (!btn) return;
+
+  const { action, id, name, blocked } = btn.dataset;
+
+  if (action === 'password') {
+    _openPasswordModal(id, name);
+  } else if (action === 'block') {
+    await _toggleBlock(id, blocked === '1');
+  } else if (action === 'delete') {
+    await _handleDelete(id, name);
+  }
+}
+
+// ========== Block / Unblock ==========
+
+async function _toggleBlock(userId, currentlyBlocked) {
+  _setError('panel-error', '');
+  try {
+    await _api('PUT', `/admin/users/${userId}/block`, { is_blocked: !currentlyBlocked });
+    await _loadUsers();
+  } catch (err) {
+    _setError('panel-error', err.message);
+  }
+}
+
+// ========== Delete ==========
+
+async function _handleDelete(userId, userName) {
+  if (!confirm(`Удалить пользователя "${userName}"?\n\nБудут удалены все его сигналы. Действие нельзя отменить.`)) return;
+  _setError('panel-error', '');
+  try {
+    await _api('DELETE', `/admin/users/${userId}`);
+    await _loadUsers();
+  } catch (err) {
+    _setError('panel-error', err.message);
+  }
+}
+
+// ========== Password modal ==========
+
+function _openPasswordModal(userId, userName) {
+  document.getElementById('modal-pw-subtitle').textContent = `Пользователь: ${userName}`;
+  document.getElementById('modal-pw-user-id').value = userId;
+  document.getElementById('new-password').value = '';
+  _setError('modal-pw-error', '');
+  document.getElementById('btn-pw-save').disabled = false;
+  document.getElementById('modal-password').hidden = false;
+  document.getElementById('new-password').focus();
+}
+
+function _closePasswordModal() {
+  document.getElementById('modal-password').hidden = true;
+}
+
+async function _handleSetPassword() {
+  const userId = document.getElementById('modal-pw-user-id').value;
+  const password = document.getElementById('new-password').value;
+  const btn = document.getElementById('btn-pw-save');
+
+  if (!password) {
+    _setError('modal-pw-error', 'Введите пароль');
+    return;
+  }
+
+  btn.disabled = true;
+  _setError('modal-pw-error', '');
+
+  try {
+    await _api('PUT', `/admin/users/${userId}/password`, { password });
+    _closePasswordModal();
+  } catch (err) {
+    _setError('modal-pw-error', err.message);
+    btn.disabled = false;
+  }
+}
+
+// ========== Create user modal ==========
+
+function _openCreateModal() {
+  document.getElementById('create-uuid').value = crypto.randomUUID();
+  document.getElementById('create-name').value = '';
+  document.getElementById('create-password').value = '';
+  _setError('create-error', '');
+  document.getElementById('btn-create-submit').disabled = false;
+  document.getElementById('modal-create').hidden = false;
+  document.getElementById('create-name').focus();
+}
+
+function _closeCreateModal() {
+  document.getElementById('modal-create').hidden = true;
+}
+
+async function _handleCreateUser() {
+  const uuid = document.getElementById('create-uuid').value.trim();
+  const name = document.getElementById('create-name').value.trim();
+  const password = document.getElementById('create-password').value;
+  const btn = document.getElementById('btn-create-submit');
+
+  if (!uuid || !name) {
+    _setError('create-error', 'UUID и имя обязательны');
+    return;
+  }
+
+  btn.disabled = true;
+  _setError('create-error', '');
+
+  const body = { uuid, name };
+  if (password) body.password = password;
+
+  try {
+    await _api('POST', '/admin/users', body);
+    _closeCreateModal();
+    await _loadUsers();
+  } catch (err) {
+    const msg = err.message.includes('409') ? 'Пользователь с таким UUID уже существует' : err.message;
+    _setError('create-error', msg);
+    btn.disabled = false;
+  }
+}
+
+// ========== Init ==========
+
+function _init() {
+  // Login screen
+  document.getElementById('btn-login').addEventListener('click', _handleLogin);
+  document.getElementById('token-input').addEventListener('keydown', (e) => {
+    if (e.key === 'Enter') _handleLogin();
+  });
+
+  // Panel
+  document.getElementById('btn-logout').addEventListener('click', _handleLogout);
+  document.getElementById('btn-create').addEventListener('click', _openCreateModal);
+
+  // Table (event delegation)
+  document.getElementById('users-table').addEventListener('click', _handleTableClick);
+
+  // Password modal
+  document.getElementById('btn-pw-cancel').addEventListener('click', _closePasswordModal);
+  document.getElementById('btn-pw-save').addEventListener('click', _handleSetPassword);
+  document.getElementById('new-password').addEventListener('keydown', (e) => {
+    if (e.key === 'Enter') _handleSetPassword();
+  });
+  document.getElementById('modal-password').addEventListener('click', (e) => {
+    if (e.target.id === 'modal-password') _closePasswordModal();
+  });
+
+  // Create modal
+  document.getElementById('btn-create-cancel').addEventListener('click', _closeCreateModal);
+  document.getElementById('btn-create-submit').addEventListener('click', _handleCreateUser);
+  document.getElementById('create-password').addEventListener('keydown', (e) => {
+    if (e.key === 'Enter') _handleCreateUser();
+  });
+  document.getElementById('modal-create').addEventListener('click', (e) => {
+    if (e.target.id === 'modal-create') _closeCreateModal();
+  });
+
+  // Auto-login if token is already saved in sessionStorage
+  if (_getToken()) {
+    _showPanel();
+    _loadUsers().catch(() => {
+      _clearToken();
+      _showTokenScreen();
+    });
+  }
+}
+
+document.addEventListener('DOMContentLoaded', _init);
diff --git a/frontend/app.js b/frontend/app.js
index 10c4b1b..e457ee7 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -56,9 +56,14 @@ function _getUserName() {
   return _storage.getItem('baton_user_name') || '';
 }
 
-function _saveRegistration(name) {
+function _getApiKey() {
+  return _storage.getItem('baton_api_key') || '';
+}
+
+function _saveRegistration(name, apiKey) {
   _storage.setItem('baton_user_name', name);
   _storage.setItem('baton_registered', '1');
+  if (apiKey) _storage.setItem('baton_api_key', apiKey);
 }
 
 function _getInitials(name) {
@@ -102,15 +107,17 @@ function _updateUserAvatar() {
 
 // ========== API calls ==========
 
-async function _apiPost(path, body) {
+async function _apiPost(path, body, extraHeaders) {
   const res = await fetch(path, {
     method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
+    headers: { 'Content-Type': 'application/json', ...extraHeaders },
     body: JSON.stringify(body),
   });
   if (!res.ok) {
     const text = await res.text().catch(() => '');
-    throw new Error('HTTP ' + res.status + (text ? ': ' + text : ''));
+    const err = new Error('HTTP ' + res.status + (text ? ': ' + text : ''));
+    err.status = res.status;
+    throw err;
   }
   return res.json();
 }
@@ -146,8 +153,8 @@ async function _handleRegister() {
 
   try {
     const uuid = _getOrCreateUserId();
-    await _apiPost('/api/register', { uuid, name });
-    _saveRegistration(name);
+    const data = await _apiPost('/api/register', { uuid, name });
+    _saveRegistration(name, data.api_key);
     _updateUserAvatar();
     _showMain();
   } catch (_) {
@@ -179,7 +186,9 @@ async function _handleSignal() {
     const body = { user_id: uuid, timestamp: Date.now() };
     if (geo) body.geo = geo;
 
-    await _apiPost('/api/signal', body);
+    const apiKey = _getApiKey();
+    const authHeaders = apiKey ? { Authorization: 'Bearer ' + apiKey } : {};
+    await _apiPost('/api/signal', body, authHeaders);
 
     _setSosState('success');
     _setStatus('Signal sent!', 'success');
@@ -187,9 +196,13 @@ async function _handleSignal() {
       _setSosState('default');
       _setStatus('', '');
     }, 2000);
-  } catch (_) {
+  } catch (err) {
     _setSosState('default');
-    _setStatus('Error sending. Try again.', 'error');
+    if (err && err.status === 401) {
+      _setStatus('Session expired or key is invalid. Please re-register.', 'error');
+    } else {
+      _setStatus('Error sending. Try again.', 'error');
+    }
   }
 }
 
diff --git a/nginx/baton.conf b/nginx/baton.conf
index 07b7857..8afbf2f 100644
--- a/nginx/baton.conf
+++ b/nginx/baton.conf
@@ -31,7 +31,7 @@ log_format baton_secure '$remote_addr - $remote_user [$time_local] '
 # ---------------------------------------------------------------------------
 server {
     listen 80;
-    server_name <YOUR_DOMAIN>;
+    server_name baton.itafrika.com;
 
     return 301 https://$server_name$request_uri;
 }
@@ -41,10 +41,10 @@ server {
 # ---------------------------------------------------------------------------
 server {
     listen 443 ssl;
-    server_name <YOUR_DOMAIN>;
+    server_name baton.itafrika.com;
 
-    ssl_certificate     /etc/letsencrypt/live/<YOUR_DOMAIN>/fullchain.pem;
-    ssl_certificate_key /etc/letsencrypt/live/<YOUR_DOMAIN>/privkey.pem;
+    ssl_certificate     /etc/letsencrypt/live/baton.itafrika.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/baton.itafrika.com/privkey.pem;
 
     ssl_protocols       TLSv1.2 TLSv1.3;
     ssl_prefer_server_ciphers on;
@@ -55,16 +55,63 @@ server {
 
     # Заголовки X-Telegram-Bot-Api-Secret-Token НЕ логируются —
     # они передаются только в proxy_pass и не попадают в access_log.
-    location / {
+
+    # API → FastAPI
+    location /api/ {
         proxy_pass         http://127.0.0.1:8000;
         proxy_set_header   Host              $host;
         proxy_set_header   X-Real-IP         $remote_addr;
         proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
         proxy_set_header   X-Forwarded-Proto $scheme;
 
-        # Таймауты для webhook-запросов от Telegram
         proxy_read_timeout  30s;
         proxy_send_timeout  30s;
         proxy_connect_timeout 5s;
     }
+
+    # Health → FastAPI
+    location /health {
+        proxy_pass         http://127.0.0.1:8000;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+    }
+
+    # Admin API → FastAPI (UI-страница /admin.html раздаётся статикой ниже)
+    location /admin/users {
+        proxy_pass         http://127.0.0.1:8000;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+
+        proxy_read_timeout  30s;
+        proxy_send_timeout  30s;
+        proxy_connect_timeout 5s;
+    }
+
+    # ---------------------------------------------------------------------------
+    # Security headers
+    # IMPORTANT: must be repeated in every location block that uses add_header,
+    # because nginx does not inherit parent add_header when child block defines its own.
+    # ---------------------------------------------------------------------------
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+    add_header X-Content-Type-Options nosniff always;
+    add_header X-Frame-Options DENY always;
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self'" always;
+
+    # Статика фронтенда (SPA)
+    location / {
+        root       /opt/baton/frontend;
+        try_files  $uri /index.html;
+        expires    1h;
+        # Security headers repeated here because add_header in location blocks
+        # overrides parent-level add_header directives (nginx inheritance rule)
+        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+        add_header X-Content-Type-Options nosniff always;
+        add_header X-Frame-Options DENY always;
+        add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self'" always;
+        add_header Cache-Control "public" always;
+    }
 }
diff --git a/tests/conftest.py b/tests/conftest.py
index 2604da8..0801e32 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -21,6 +21,7 @@ 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")
 
 # ── 2. aiosqlite monkey-patch ────────────────────────────────────────────────
 import aiosqlite
@@ -78,6 +79,7 @@ def make_app_client():
     """
     tg_set_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"
     send_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
+    get_me_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/getMe"
 
     @contextlib.asynccontextmanager
     async def _ctx():
@@ -85,6 +87,9 @@ def make_app_client():
             from backend.main import app
 
             mock_router = respx.mock(assert_all_called=False)
+            mock_router.get(get_me_url).mock(
+                return_value=httpx.Response(200, json={"ok": True, "result": {"username": "testbot"}})
+            )
             mock_router.post(tg_set_url).mock(
                 return_value=httpx.Response(200, json={"ok": True, "result": True})
             )
diff --git a/tests/test_arch_002.py b/tests/test_arch_002.py
index a89dfa5..c979b1d 100644
--- a/tests/test_arch_002.py
+++ b/tests/test_arch_002.py
@@ -5,6 +5,10 @@ Acceptance criteria:
 1. No asyncio task for the aggregator is created at lifespan startup.
 2. POST /api/signal calls telegram.send_message directly (no aggregator intermediary).
 3. SignalAggregator class in telegram.py is preserved with '# v2.0 feature' marker.
+
+UUID notes: all UUIDs satisfy the UUID v4 pattern.
+BATON-SEC-003: POST /api/signal now requires Authorization: Bearer <api_key>.
+Tests that send signals register first and use the returned api_key.
 """
 from __future__ import annotations
 
@@ -15,6 +19,7 @@ os.environ.setdefault("CHAT_ID", "-1001234567890")
 os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
 os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
 os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
 
 from pathlib import Path
 from unittest.mock import AsyncMock, patch
@@ -25,6 +30,20 @@ from tests.conftest import make_app_client
 
 _BACKEND_DIR = Path(__file__).parent.parent / "backend"
 
+# Valid UUID v4 constants
+_UUID_S1 = "a0100001-0000-4000-8000-000000000001"
+_UUID_S2 = "a0100002-0000-4000-8000-000000000002"
+_UUID_S3 = "a0100003-0000-4000-8000-000000000003"
+_UUID_S4 = "a0100004-0000-4000-8000-000000000004"
+_UUID_S5 = "a0100005-0000-4000-8000-000000000005"
+
+
+async def _register(client, uuid: str, name: str) -> str:
+    """Register user and return api_key."""
+    r = await client.post("/api/register", json={"uuid": uuid, "name": name})
+    assert r.status_code == 200
+    return r.json()["api_key"]
+
 
 # ---------------------------------------------------------------------------
 # Criterion 1 — No asyncio task for aggregator created at startup (static)
@@ -72,11 +91,12 @@ def test_aggregator_instantiation_commented_out_in_main():
 async def test_signal_calls_telegram_send_message_directly():
     """POST /api/signal must call telegram.send_message directly, not via aggregator (ADR-004)."""
     async with make_app_client() as client:
-        await client.post("/api/register", json={"uuid": "adr-uuid-s1", "name": "Tester"})
+        api_key = await _register(client, _UUID_S1, "Tester")
         with patch("backend.telegram.send_message", new_callable=AsyncMock) as mock_send:
             resp = await client.post(
                 "/api/signal",
-                json={"user_id": "adr-uuid-s1", "timestamp": 1742478000000},
+                json={"user_id": _UUID_S1, "timestamp": 1742478000000},
+                headers={"Authorization": f"Bearer {api_key}"},
             )
             assert resp.status_code == 200
             mock_send.assert_called_once()
@@ -86,11 +106,12 @@ async def test_signal_calls_telegram_send_message_directly():
 async def test_signal_message_contains_registered_username():
     """Message passed to send_message must include the registered user's name."""
     async with make_app_client() as client:
-        await client.post("/api/register", json={"uuid": "adr-uuid-s2", "name": "Alice"})
+        api_key = await _register(client, _UUID_S2, "Alice")
         with patch("backend.telegram.send_message", new_callable=AsyncMock) as mock_send:
             await client.post(
                 "/api/signal",
-                json={"user_id": "adr-uuid-s2", "timestamp": 1742478000000},
+                json={"user_id": _UUID_S2, "timestamp": 1742478000000},
+                headers={"Authorization": f"Bearer {api_key}"},
             )
             text = mock_send.call_args[0][0]
     assert "Alice" in text
@@ -100,11 +121,12 @@ async def test_signal_message_contains_registered_username():
 async def test_signal_message_without_geo_contains_bez_geolocatsii():
     """When geo is None, message must contain 'Без геолокации'."""
     async with make_app_client() as client:
-        await client.post("/api/register", json={"uuid": "adr-uuid-s3", "name": "Bob"})
+        api_key = await _register(client, _UUID_S3, "Bob")
         with patch("backend.telegram.send_message", new_callable=AsyncMock) as mock_send:
             await client.post(
                 "/api/signal",
-                json={"user_id": "adr-uuid-s3", "timestamp": 1742478000000, "geo": None},
+                json={"user_id": _UUID_S3, "timestamp": 1742478000000, "geo": None},
+                headers={"Authorization": f"Bearer {api_key}"},
             )
             text = mock_send.call_args[0][0]
     assert "Без геолокации" in text
@@ -114,15 +136,16 @@ async def test_signal_message_without_geo_contains_bez_geolocatsii():
 async def test_signal_message_with_geo_contains_coordinates():
     """When geo is provided, message must contain lat and lon values."""
     async with make_app_client() as client:
-        await client.post("/api/register", json={"uuid": "adr-uuid-s4", "name": "Charlie"})
+        api_key = await _register(client, _UUID_S4, "Charlie")
         with patch("backend.telegram.send_message", new_callable=AsyncMock) as mock_send:
             await client.post(
                 "/api/signal",
                 json={
-                    "user_id": "adr-uuid-s4",
+                    "user_id": _UUID_S4,
                     "timestamp": 1742478000000,
                     "geo": {"lat": 55.7558, "lon": 37.6173, "accuracy": 15.0},
                 },
+                headers={"Authorization": f"Bearer {api_key}"},
             )
             text = mock_send.call_args[0][0]
     assert "55.7558" in text
@@ -133,29 +156,17 @@ async def test_signal_message_with_geo_contains_coordinates():
 async def test_signal_message_contains_utc_marker():
     """Message passed to send_message must contain 'UTC' timestamp marker."""
     async with make_app_client() as client:
-        await client.post("/api/register", json={"uuid": "adr-uuid-s5", "name": "Dave"})
+        api_key = await _register(client, _UUID_S5, "Dave")
         with patch("backend.telegram.send_message", new_callable=AsyncMock) as mock_send:
             await client.post(
                 "/api/signal",
-                json={"user_id": "adr-uuid-s5", "timestamp": 1742478000000},
+                json={"user_id": _UUID_S5, "timestamp": 1742478000000},
+                headers={"Authorization": f"Bearer {api_key}"},
             )
             text = mock_send.call_args[0][0]
     assert "UTC" in text
 
 
-@pytest.mark.asyncio
-async def test_signal_unknown_user_message_uses_uuid_prefix():
-    """When user is not registered, message uses first 8 chars of uuid as name."""
-    async with make_app_client() as client:
-        with patch("backend.telegram.send_message", new_callable=AsyncMock) as mock_send:
-            await client.post(
-                "/api/signal",
-                json={"user_id": "unknown-uuid-xyz", "timestamp": 1742478000000},
-            )
-            text = mock_send.call_args[0][0]
-    assert "unknown-" in text  # "unknown-uuid-xyz"[:8] == "unknown-"
-
-
 # ---------------------------------------------------------------------------
 # Criterion 3 — SignalAggregator preserved with '# v2.0 feature' marker (static)
 # ---------------------------------------------------------------------------
diff --git a/tests/test_arch_003.py b/tests/test_arch_003.py
index 248086f..ee221b8 100644
--- a/tests/test_arch_003.py
+++ b/tests/test_arch_003.py
@@ -6,6 +6,9 @@ Acceptance criteria:
    5 requests pass (200), 6th returns 429; counter resets after the 10-minute window.
 2. Token comparison is timing-safe:
    secrets.compare_digest is used in middleware.py (no == / != for token comparison).
+
+UUID notes: RegisterRequest.uuid requires a valid UUID v4 pattern.
+All UUID constants below satisfy this constraint.
 """
 from __future__ import annotations
 
@@ -20,6 +23,7 @@ os.environ.setdefault("CHAT_ID", "-1001234567890")
 os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
 os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
 os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
 
 import pytest
 from tests.conftest import make_app_client
@@ -38,6 +42,24 @@ _SAMPLE_UPDATE = {
     },
 }
 
+# Valid UUID v4 constants for rate-limit tests
+# Pattern: [0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}
+_UUIDS_OK = [
+    f"d0{i:06d}-0000-4000-8000-000000000001"
+    for i in range(10)
+]
+_UUIDS_BLK = [
+    f"d1{i:06d}-0000-4000-8000-000000000001"
+    for i in range(10)
+]
+_UUIDS_EXP = [
+    f"d2{i:06d}-0000-4000-8000-000000000001"
+    for i in range(10)
+]
+_UUID_BLK_999   = "d1000999-0000-4000-8000-000000000001"
+_UUID_EXP_BLK   = "d2000999-0000-4000-8000-000000000001"
+_UUID_EXP_AFTER = "d2001000-0000-4000-8000-000000000001"
+
 
 # ---------------------------------------------------------------------------
 # Criterion 1 — Rate limiting: first 5 requests pass
@@ -51,7 +73,7 @@ async def test_register_rate_limit_allows_five_requests():
         for i in range(5):
             resp = await client.post(
                 "/api/register",
-                json={"uuid": f"rl-ok-{i:03d}", "name": f"User{i}"},
+                json={"uuid": _UUIDS_OK[i], "name": f"User{i}"},
             )
             assert resp.status_code == 200, (
                 f"Request {i + 1}/5 unexpectedly returned {resp.status_code}"
@@ -70,11 +92,11 @@ async def test_register_rate_limit_blocks_sixth_request():
         for i in range(5):
             await client.post(
                 "/api/register",
-                json={"uuid": f"rl-blk-{i:03d}", "name": f"User{i}"},
+                json={"uuid": _UUIDS_BLK[i], "name": f"User{i}"},
             )
         resp = await client.post(
             "/api/register",
-            json={"uuid": "rl-blk-999", "name": "Attacker"},
+            json={"uuid": _UUID_BLK_999, "name": "Attacker"},
         )
     assert resp.status_code == 429
 
@@ -94,13 +116,13 @@ async def test_register_rate_limit_resets_after_window_expires():
         for i in range(5):
             await client.post(
                 "/api/register",
-                json={"uuid": f"rl-exp-{i:03d}", "name": f"User{i}"},
+                json={"uuid": _UUIDS_EXP[i], "name": f"User{i}"},
             )
 
         # Verify the 6th is blocked before window expiry
         blocked = await client.post(
             "/api/register",
-            json={"uuid": "rl-exp-blk", "name": "Attacker"},
+            json={"uuid": _UUID_EXP_BLK, "name": "Attacker"},
         )
         assert blocked.status_code == 429, (
             "Expected 429 after exhausting rate limit, got " + str(blocked.status_code)
@@ -110,7 +132,7 @@ async def test_register_rate_limit_resets_after_window_expires():
         with patch("time.time", return_value=base_time + 601):
             resp_after = await client.post(
                 "/api/register",
-                json={"uuid": "rl-exp-after", "name": "Legit"},
+                json={"uuid": _UUID_EXP_AFTER, "name": "Legit"},
             )
 
     assert resp_after.status_code == 200, (
diff --git a/tests/test_arch_013.py b/tests/test_arch_013.py
index b70c682..307ffbc 100644
--- a/tests/test_arch_013.py
+++ b/tests/test_arch_013.py
@@ -54,14 +54,14 @@ async def test_health_returns_status_ok():
 
 
 @pytest.mark.asyncio
-async def test_health_returns_timestamp():
-    """GET /health должен вернуть поле timestamp в JSON."""
+async def test_health_no_timestamp():
+    """GET /health не должен возвращать поле timestamp (устраняет time-based fingerprinting)."""
     async with make_app_client() as client:
         response = await client.get("/health")
 
     data = response.json()
-    assert "timestamp" in data
-    assert isinstance(data["timestamp"], int)
+    assert "timestamp" not in data
+    assert data == {"status": "ok"}
 
 
 @pytest.mark.asyncio
diff --git a/tests/test_baton_005.py b/tests/test_baton_005.py
new file mode 100644
index 0000000..1504d21
--- /dev/null
+++ b/tests/test_baton_005.py
@@ -0,0 +1,514 @@
+"""
+Tests for BATON-005: Admin panel — user creation, password change, block/unblock, delete.
+
+Acceptance criteria:
+1. Создание пользователя — пользователь появляется в БД (GET /admin/users)
+2. Смена пароля — endpoint возвращает ok, 404 для несуществующего пользователя
+3. Блокировка — заблокированный пользователь не может отправить сигнал (403)
+4. Разблокировка — восстанавливает доступ (сигнал снова проходит)
+5. Удаление — пользователь исчезает из GET /admin/users, возвращается 204
+6. Защита: неавторизованный запрос к /admin/* возвращает 401
+7. Отсутствие регрессии с основным функционалом
+
+BATON-SEC-003: POST /api/signal now requires Authorization: Bearer <api_key>.
+Tests 3 and 4 (block/unblock + signal) use /api/register to obtain an api_key,
+then admin block/unblock the user by their DB id.
+"""
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import pytest
+
+from tests.conftest import make_app_client
+
+PROJECT_ROOT = Path(__file__).parent.parent
+NGINX_CONF = PROJECT_ROOT / "nginx" / "baton.conf"
+
+ADMIN_HEADERS = {"Authorization": "Bearer test-admin-token"}
+WRONG_HEADERS = {"Authorization": "Bearer wrong-token"}
+
+# Valid UUID v4 for signal-related tests (registered via /api/register)
+_UUID_BLOCK   = "f0000001-0000-4000-8000-000000000001"
+_UUID_UNBLOCK = "f0000002-0000-4000-8000-000000000002"
+_UUID_SIG_OK  = "f0000003-0000-4000-8000-000000000003"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 6 — Unauthorised requests to /admin/* return 401
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_admin_list_users_without_token_returns_401() -> None:
+    """GET /admin/users без Authorization header должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.get("/admin/users")
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_admin_list_users_wrong_token_returns_401() -> None:
+    """GET /admin/users с неверным токеном должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.get("/admin/users", headers=WRONG_HEADERS)
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_admin_create_user_without_token_returns_401() -> None:
+    """POST /admin/users без токена должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/admin/users",
+            json={"uuid": "unauth-uuid-001", "name": "Ghost"},
+        )
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_admin_set_password_without_token_returns_401() -> None:
+    """PUT /admin/users/1/password без токена должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.put(
+            "/admin/users/1/password",
+            json={"password": "newpass"},
+        )
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_admin_block_user_without_token_returns_401() -> None:
+    """PUT /admin/users/1/block без токена должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.put(
+            "/admin/users/1/block",
+            json={"is_blocked": True},
+        )
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_admin_delete_user_without_token_returns_401() -> None:
+    """DELETE /admin/users/1 без токена должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.delete("/admin/users/1")
+    assert resp.status_code == 401
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — Create user: appears in DB
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_admin_create_user_returns_201_with_user_data() -> None:
+    """POST /admin/users с валидными данными должен вернуть 201 с полями пользователя."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/admin/users",
+            json={"uuid": "create-uuid-001", "name": "Alice Admin"},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 201
+    data = resp.json()
+    assert data["uuid"] == "create-uuid-001"
+    assert data["name"] == "Alice Admin"
+    assert data["id"] > 0
+    assert data["is_blocked"] is False
+
+
+@pytest.mark.asyncio
+async def test_admin_create_user_appears_in_list() -> None:
+    """После POST /admin/users пользователь появляется в GET /admin/users."""
+    async with make_app_client() as client:
+        await client.post(
+            "/admin/users",
+            json={"uuid": "create-uuid-002", "name": "Bob Admin"},
+            headers=ADMIN_HEADERS,
+        )
+        resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
+
+    assert resp.status_code == 200
+    users = resp.json()
+    uuids = [u["uuid"] for u in users]
+    assert "create-uuid-002" in uuids
+
+
+@pytest.mark.asyncio
+async def test_admin_create_user_duplicate_uuid_returns_409() -> None:
+    """POST /admin/users с существующим UUID должен вернуть 409."""
+    async with make_app_client() as client:
+        await client.post(
+            "/admin/users",
+            json={"uuid": "create-uuid-003", "name": "Carol"},
+            headers=ADMIN_HEADERS,
+        )
+        resp = await client.post(
+            "/admin/users",
+            json={"uuid": "create-uuid-003", "name": "Carol Duplicate"},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 409
+
+
+@pytest.mark.asyncio
+async def test_admin_list_users_returns_200_with_list() -> None:
+    """GET /admin/users с правильным токеном должен вернуть 200 со списком."""
+    async with make_app_client() as client:
+        resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
+    assert resp.status_code == 200
+    assert isinstance(resp.json(), list)
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — Password change
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_admin_set_password_returns_ok() -> None:
+    """PUT /admin/users/{id}/password для существующего пользователя возвращает {"ok": True}."""
+    async with make_app_client() as client:
+        create_resp = await client.post(
+            "/admin/users",
+            json={"uuid": "pass-uuid-001", "name": "PassUser"},
+            headers=ADMIN_HEADERS,
+        )
+        user_id = create_resp.json()["id"]
+
+        resp = await client.put(
+            f"/admin/users/{user_id}/password",
+            json={"password": "newpassword123"},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 200
+    assert resp.json() == {"ok": True}
+
+
+@pytest.mark.asyncio
+async def test_admin_set_password_nonexistent_user_returns_404() -> None:
+    """PUT /admin/users/99999/password для несуществующего пользователя возвращает 404."""
+    async with make_app_client() as client:
+        resp = await client.put(
+            "/admin/users/99999/password",
+            json={"password": "somepassword"},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 404
+
+
+@pytest.mark.asyncio
+async def test_admin_set_password_user_still_accessible_after_change() -> None:
+    """Пользователь остаётся доступен в GET /admin/users после смены пароля."""
+    async with make_app_client() as client:
+        create_resp = await client.post(
+            "/admin/users",
+            json={"uuid": "pass-uuid-002", "name": "PassUser2"},
+            headers=ADMIN_HEADERS,
+        )
+        user_id = create_resp.json()["id"]
+
+        await client.put(
+            f"/admin/users/{user_id}/password",
+            json={"password": "updatedpass"},
+            headers=ADMIN_HEADERS,
+        )
+
+        list_resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
+
+    uuids = [u["uuid"] for u in list_resp.json()]
+    assert "pass-uuid-002" in uuids
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — Block user: blocked user cannot send signal
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_admin_block_user_returns_is_blocked_true() -> None:
+    """PUT /admin/users/{id}/block с is_blocked=true должен вернуть пользователя с is_blocked=True."""
+    async with make_app_client() as client:
+        create_resp = await client.post(
+            "/admin/users",
+            json={"uuid": "block-uuid-001", "name": "BlockUser"},
+            headers=ADMIN_HEADERS,
+        )
+        user_id = create_resp.json()["id"]
+
+        resp = await client.put(
+            f"/admin/users/{user_id}/block",
+            json={"is_blocked": True},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 200
+    assert resp.json()["is_blocked"] is True
+
+
+@pytest.mark.asyncio
+async def test_admin_block_user_prevents_signal() -> None:
+    """Заблокированный пользователь не может отправить сигнал — /api/signal возвращает 403."""
+    async with make_app_client() as client:
+        # Регистрируем через /api/register чтобы получить api_key
+        reg_resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_BLOCK, "name": "BlockSignalUser"},
+        )
+        assert reg_resp.status_code == 200
+        api_key = reg_resp.json()["api_key"]
+        user_uuid = reg_resp.json()["uuid"]
+
+        # Находим ID пользователя
+        users_resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
+        user = next(u for u in users_resp.json() if u["uuid"] == user_uuid)
+        user_id = user["id"]
+
+        # Блокируем
+        await client.put(
+            f"/admin/users/{user_id}/block",
+            json={"is_blocked": True},
+            headers=ADMIN_HEADERS,
+        )
+
+        # Заблокированный пользователь должен получить 403
+        signal_resp = await client.post(
+            "/api/signal",
+            json={"user_id": user_uuid, "timestamp": 1700000000000, "geo": None},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+    assert signal_resp.status_code == 403
+
+
+@pytest.mark.asyncio
+async def test_admin_block_nonexistent_user_returns_404() -> None:
+    """PUT /admin/users/99999/block для несуществующего пользователя возвращает 404."""
+    async with make_app_client() as client:
+        resp = await client.put(
+            "/admin/users/99999/block",
+            json={"is_blocked": True},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 404
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — Unblock user: restores access
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_admin_unblock_user_returns_is_blocked_false() -> None:
+    """PUT /admin/users/{id}/block с is_blocked=false должен вернуть пользователя с is_blocked=False."""
+    async with make_app_client() as client:
+        create_resp = await client.post(
+            "/admin/users",
+            json={"uuid": "unblock-uuid-001", "name": "UnblockUser"},
+            headers=ADMIN_HEADERS,
+        )
+        user_id = create_resp.json()["id"]
+
+        await client.put(
+            f"/admin/users/{user_id}/block",
+            json={"is_blocked": True},
+            headers=ADMIN_HEADERS,
+        )
+
+        resp = await client.put(
+            f"/admin/users/{user_id}/block",
+            json={"is_blocked": False},
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 200
+    assert resp.json()["is_blocked"] is False
+
+
+@pytest.mark.asyncio
+async def test_admin_unblock_user_restores_signal_access() -> None:
+    """После разблокировки пользователь снова может отправить сигнал (200)."""
+    async with make_app_client() as client:
+        # Регистрируем через /api/register чтобы получить api_key
+        reg_resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_UNBLOCK, "name": "UnblockSignalUser"},
+        )
+        assert reg_resp.status_code == 200
+        api_key = reg_resp.json()["api_key"]
+        user_uuid = reg_resp.json()["uuid"]
+
+        # Находим ID
+        users_resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
+        user = next(u for u in users_resp.json() if u["uuid"] == user_uuid)
+        user_id = user["id"]
+
+        # Блокируем
+        await client.put(
+            f"/admin/users/{user_id}/block",
+            json={"is_blocked": True},
+            headers=ADMIN_HEADERS,
+        )
+
+        # Разблокируем
+        await client.put(
+            f"/admin/users/{user_id}/block",
+            json={"is_blocked": False},
+            headers=ADMIN_HEADERS,
+        )
+
+        # Сигнал должен пройти
+        signal_resp = await client.post(
+            "/api/signal",
+            json={"user_id": user_uuid, "timestamp": 1700000000000, "geo": None},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+    assert signal_resp.status_code == 200
+    assert signal_resp.json()["status"] == "ok"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5 — Delete user: disappears from DB
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_admin_delete_user_returns_204() -> None:
+    """DELETE /admin/users/{id} для существующего пользователя возвращает 204."""
+    async with make_app_client() as client:
+        create_resp = await client.post(
+            "/admin/users",
+            json={"uuid": "delete-uuid-001", "name": "DeleteUser"},
+            headers=ADMIN_HEADERS,
+        )
+        user_id = create_resp.json()["id"]
+
+        resp = await client.delete(
+            f"/admin/users/{user_id}",
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 204
+
+
+@pytest.mark.asyncio
+async def test_admin_delete_user_disappears_from_list() -> None:
+    """После DELETE /admin/users/{id} пользователь отсутствует в GET /admin/users."""
+    async with make_app_client() as client:
+        create_resp = await client.post(
+            "/admin/users",
+            json={"uuid": "delete-uuid-002", "name": "DeleteUser2"},
+            headers=ADMIN_HEADERS,
+        )
+        user_id = create_resp.json()["id"]
+
+        await client.delete(
+            f"/admin/users/{user_id}",
+            headers=ADMIN_HEADERS,
+        )
+
+        list_resp = await client.get("/admin/users", headers=ADMIN_HEADERS)
+
+    uuids = [u["uuid"] for u in list_resp.json()]
+    assert "delete-uuid-002" not in uuids
+
+
+@pytest.mark.asyncio
+async def test_admin_delete_nonexistent_user_returns_404() -> None:
+    """DELETE /admin/users/99999 для несуществующего пользователя возвращает 404."""
+    async with make_app_client() as client:
+        resp = await client.delete(
+            "/admin/users/99999",
+            headers=ADMIN_HEADERS,
+        )
+    assert resp.status_code == 404
+
+
+# ---------------------------------------------------------------------------
+# nginx config — location /admin/users block (BATON-006 fix)
+# ---------------------------------------------------------------------------
+
+
+def test_nginx_conf_has_admin_users_location_block() -> None:
+    """nginx/baton.conf должен содержать блок location /admin/users."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    assert re.search(r"location\s+/admin/users\b", content), (
+        "nginx/baton.conf не содержит блок location /admin/users — "
+        "запросы к admin API будут попадать в location / и возвращать 404"
+    )
+
+
+def test_nginx_conf_admin_users_location_proxies_to_fastapi() -> None:
+    """Блок location /admin/users должен делать proxy_pass на 127.0.0.1:8000."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    admin_block = re.search(
+        r"location\s+/admin/users\s*\{([^}]+)\}", content, re.DOTALL
+    )
+    assert admin_block is not None, "Блок location /admin/users { ... } не найден"
+    assert re.search(r"proxy_pass\s+http://127\.0\.0\.1:8000", admin_block.group(1)), (
+        "Блок location /admin/users не содержит proxy_pass http://127.0.0.1:8000"
+    )
+
+
+def test_nginx_conf_admin_users_location_before_root_location() -> None:
+    """location /admin/users должен находиться в nginx.conf до location / для корректного prefix-matching."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    admin_pos = content.find("location /admin/users")
+    root_pos = re.search(r"location\s+/\s*\{", content)
+    assert admin_pos != -1, "Блок location /admin/users не найден"
+    assert root_pos is not None, "Блок location / не найден"
+    assert admin_pos < root_pos.start(), (
+        "location /admin/users должен быть определён ДО location / в nginx.conf"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 7 — No regression with main functionality
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_register_not_broken_after_admin_operations() -> None:
+    """POST /api/register работает корректно после выполнения admin-операций."""
+    async with make_app_client() as client:
+        # Admin операции
+        await client.post(
+            "/admin/users",
+            json={"uuid": "regress-admin-uuid-001", "name": "AdminCreated"},
+            headers=ADMIN_HEADERS,
+        )
+
+        # Основной функционал
+        resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_SIG_OK, "name": "RegularUser"},
+        )
+    assert resp.status_code == 200
+    assert resp.json()["uuid"] == _UUID_SIG_OK
+
+
+@pytest.mark.asyncio
+async def test_signal_from_registered_unblocked_user_succeeds() -> None:
+    """Зарегистрированный незаблокированный пользователь может отправить сигнал."""
+    async with make_app_client() as client:
+        reg_resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_SIG_OK, "name": "SignalUser"},
+        )
+        assert reg_resp.status_code == 200
+        api_key = reg_resp.json()["api_key"]
+        user_uuid = reg_resp.json()["uuid"]
+
+        signal_resp = await client.post(
+            "/api/signal",
+            json={"user_id": user_uuid, "timestamp": 1700000000000, "geo": None},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+    assert signal_resp.status_code == 200
+    assert signal_resp.json()["status"] == "ok"
diff --git a/tests/test_baton_006.py b/tests/test_baton_006.py
new file mode 100644
index 0000000..b76681e
--- /dev/null
+++ b/tests/test_baton_006.py
@@ -0,0 +1,244 @@
+"""
+Tests for BATON-006: не работает фронт — {"detail":"Not Found"}
+
+Acceptance criteria:
+1. nginx/baton.conf содержит location /api/ (prefix match), проксирует на FastAPI.
+2. nginx/baton.conf содержит location /health, проксирует на FastAPI.
+3. nginx/baton.conf содержит location / с root и try_files (SPA-поведение).
+4. GET / на FastAPI возвращает 404 (маршрут /  не зарегистрирован в main.py —
+   статику должен отдавать nginx, а не FastAPI).
+5. GET /health возвращает 200 (FastAPI-маршрут работает).
+6. POST /api/register возвращает 200 (FastAPI-маршрут не сломан).
+7. POST /api/signal возвращает 200 (FastAPI-маршрут не сломан).
+8. POST /api/webhook/telegram возвращает 200 с корректным секретом.
+
+BATON-SEC-003: POST /api/signal now requires Authorization: Bearer <api_key>.
+UUID constants satisfy the UUID v4 pattern.
+"""
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import pytest
+
+from tests.conftest import make_app_client
+
+PROJECT_ROOT = Path(__file__).parent.parent
+NGINX_CONF = PROJECT_ROOT / "nginx" / "baton.conf"
+
+# Valid UUID v4 constants
+_UUID_REG = "e0000001-0000-4000-8000-000000000001"
+_UUID_SIG = "e0000002-0000-4000-8000-000000000002"
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — location /api/ proxies to FastAPI
+# ---------------------------------------------------------------------------
+
+
+def test_nginx_conf_exists() -> None:
+    """nginx/baton.conf должен существовать в репозитории."""
+    assert NGINX_CONF.is_file(), f"nginx/baton.conf не найден: {NGINX_CONF}"
+
+
+def test_nginx_conf_has_api_location_block() -> None:
+    """nginx/baton.conf должен содержать location /api/ (prefix match)."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    assert re.search(r"location\s+/api/", content), (
+        "nginx/baton.conf не содержит блок location /api/"
+    )
+
+
+def test_nginx_conf_api_location_proxies_to_fastapi() -> None:
+    """Блок location /api/ должен делать proxy_pass на 127.0.0.1:8000."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    api_block = re.search(
+        r"location\s+/api/\s*\{([^}]+)\}", content, re.DOTALL
+    )
+    assert api_block is not None, "Блок location /api/ { ... } не найден"
+    assert re.search(r"proxy_pass\s+http://127\.0\.0\.1:8000", api_block.group(1)), (
+        "Блок location /api/ не содержит proxy_pass http://127.0.0.1:8000"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — location /health proxies to FastAPI
+# ---------------------------------------------------------------------------
+
+
+def test_nginx_conf_has_health_location_block() -> None:
+    """nginx/baton.conf должен содержать отдельный location /health."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    assert re.search(r"location\s+/health\b", content), (
+        "nginx/baton.conf не содержит блок location /health"
+    )
+
+
+def test_nginx_conf_health_location_proxies_to_fastapi() -> None:
+    """Блок location /health должен делать proxy_pass на 127.0.0.1:8000."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    health_block = re.search(
+        r"location\s+/health\s*\{([^}]+)\}", content, re.DOTALL
+    )
+    assert health_block is not None, "Блок location /health { ... } не найден"
+    assert re.search(r"proxy_pass\s+http://127\.0\.0\.1:8000", health_block.group(1)), (
+        "Блок location /health не содержит proxy_pass http://127.0.0.1:8000"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — location / serves static files (SPA)
+# ---------------------------------------------------------------------------
+
+
+def test_nginx_conf_root_location_has_root_directive() -> None:
+    """location / в nginx.conf должен содержать директиву root (статика)."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    root_block = re.search(
+        r"location\s+/\s*\{([^}]+)\}", content, re.DOTALL
+    )
+    assert root_block is not None, "Блок location / { ... } не найден"
+    assert re.search(r"root\s+", root_block.group(1)), (
+        "Блок location / не содержит директиву root — SPA статика не настроена"
+    )
+
+
+def test_nginx_conf_root_location_has_try_files_for_spa() -> None:
+    """location / должен содержать try_files с fallback на /index.html (SPA)."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    root_block = re.search(
+        r"location\s+/\s*\{([^}]+)\}", content, re.DOTALL
+    )
+    assert root_block is not None, "Блок location / { ... } не найден"
+    assert re.search(r"try_files\s+\$uri\s+/index\.html", root_block.group(1)), (
+        "Блок location / не содержит try_files $uri /index.html — "
+        "SPA-роутинг не работает"
+    )
+
+
+def test_nginx_conf_root_location_does_not_proxy_to_fastapi() -> None:
+    """location / НЕ должен делать proxy_pass на FastAPI (только статика)."""
+    content = NGINX_CONF.read_text(encoding="utf-8")
+    root_block = re.search(
+        r"location\s+/\s*\{([^}]+)\}", content, re.DOTALL
+    )
+    assert root_block is not None, "Блок location / { ... } не найден"
+    assert not re.search(r"proxy_pass", root_block.group(1)), (
+        "Блок location / содержит proxy_pass — GET / будет проксирован в FastAPI, "
+        "что вернёт 404 {'detail':'Not Found'} (исходная ошибка BATON-006)"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — FastAPI не имеет маршрута GET /
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_fastapi_root_returns_404() -> None:
+    """GET / должен возвращать 404 от FastAPI — маршрут не зарегистрирован.
+
+    Это ожидаемое поведение: статику отдаёт nginx (location / с root + try_files),
+    а не FastAPI. Регрессия: если когда-нибудь GET / начнёт возвращать 200 от FastAPI,
+    это нарушит архитектуру (FastAPI не должен отдавать статику).
+    """
+    async with make_app_client() as client:
+        response = await client.get("/")
+
+    assert response.status_code == 404, (
+        f"GET / должен возвращать 404 от FastAPI (статику отдаёт nginx). "
+        f"Получено: {response.status_code}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5 — GET /health работает
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_health_endpoint_returns_200() -> None:
+    """GET /health должен возвращать 200 после изменений nginx-конфига."""
+    async with make_app_client() as client:
+        response = await client.get("/health")
+
+    assert response.status_code == 200
+    assert response.json().get("status") == "ok"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 6 — POST /api/register не сломан
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_api_register_not_broken_after_nginx_change() -> None:
+    """POST /api/register должен вернуть 200 — функция не сломана изменением nginx."""
+    async with make_app_client() as client:
+        response = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_REG, "name": "TestUser"},
+        )
+
+    assert response.status_code == 200
+    data = response.json()
+    assert data["user_id"] > 0
+    assert data["uuid"] == _UUID_REG
+    assert "api_key" in data
+
+
+# ---------------------------------------------------------------------------
+# Criterion 7 — POST /api/signal не сломан
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_api_signal_not_broken_after_nginx_change() -> None:
+    """POST /api/signal должен вернуть 200 — функция не сломана изменением nginx."""
+    async with make_app_client() as client:
+        reg_resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_SIG, "name": "SignalUser"},
+        )
+        assert reg_resp.status_code == 200
+        api_key = reg_resp.json()["api_key"]
+
+        response = await client.post(
+            "/api/signal",
+            json={
+                "user_id": _UUID_SIG,
+                "timestamp": 1700000000000,
+                "geo": None,
+            },
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+
+    assert response.status_code == 200
+    assert response.json().get("status") == "ok"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 8 — POST /api/webhook/telegram не сломан
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_api_webhook_telegram_not_broken_after_nginx_change() -> None:
+    """POST /api/webhook/telegram с корректным секретом должен вернуть 200."""
+    async with make_app_client() as client:
+        response = await client.post(
+            "/api/webhook/telegram",
+            json={"update_id": 200, "message": {"text": "hello"}},
+            headers={"X-Telegram-Bot-Api-Secret-Token": "test-webhook-secret"},
+        )
+
+    assert response.status_code == 200
+    assert response.json() == {"ok": True}
diff --git a/tests/test_baton_007.py b/tests/test_baton_007.py
new file mode 100644
index 0000000..0030c7d
--- /dev/null
+++ b/tests/test_baton_007.py
@@ -0,0 +1,262 @@
+"""
+Tests for BATON-007: Verifying real Telegram delivery when a signal is sent.
+
+Acceptance criteria:
+1. After pressing the button, a message physically appears in the Telegram group.
+   (verified: send_message is called with correct content containing user name)
+2. journalctl -u baton does NOT throw ERROR during send.
+   (verified: no exception is raised when Telegram returns 200)
+3. A repeated request is also delivered.
+   (verified: two consecutive signals each trigger send_message)
+
+NOTE: These tests verify that send_message is called with correct parameters.
+Physical delivery to an actual Telegram group is outside unit test scope.
+"""
+from __future__ import annotations
+
+import asyncio
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import json
+from unittest.mock import AsyncMock, patch
+
+import httpx
+import pytest
+import respx
+from httpx import AsyncClient
+
+from tests.conftest import make_app_client
+
+# Valid UUID v4 constants — must not collide with UUIDs in other test files
+_UUID_A = "d0000001-0000-4000-8000-000000000001"
+_UUID_B = "d0000002-0000-4000-8000-000000000002"
+_UUID_C = "d0000003-0000-4000-8000-000000000003"
+_UUID_D = "d0000004-0000-4000-8000-000000000004"
+_UUID_E = "d0000005-0000-4000-8000-000000000005"
+
+
+async def _register(client: AsyncClient, uuid: str, name: str) -> str:
+    r = await client.post("/api/register", json={"uuid": uuid, "name": name})
+    assert r.status_code == 200, f"Registration failed: {r.status_code} {r.text}"
+    return r.json()["api_key"]
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — send_message is called with text containing the user's name
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_send_message_called_with_user_name():
+    """Criterion 1: send_message is invoked with text that includes the sender's name."""
+    sent_texts: list[str] = []
+
+    async def _capture(text: str) -> None:
+        sent_texts.append(text)
+
+    async with make_app_client() as client:
+        api_key = await _register(client, _UUID_A, "AliceBaton")
+
+        with patch("backend.telegram.send_message", side_effect=_capture):
+            resp = await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_A, "timestamp": 1742478000000},
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+            await asyncio.sleep(0)  # yield to event loop so background task runs
+
+    assert resp.status_code == 200
+    assert len(sent_texts) == 1, f"Expected 1 send_message call, got {len(sent_texts)}"
+    assert "AliceBaton" in sent_texts[0], (
+        f"Expected user name 'AliceBaton' in Telegram message, got: {sent_texts[0]!r}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_signal_send_message_text_contains_signal_keyword():
+    """Criterion 1: Telegram message text contains the word 'Сигнал'."""
+    sent_texts: list[str] = []
+
+    async def _capture(text: str) -> None:
+        sent_texts.append(text)
+
+    async with make_app_client() as client:
+        api_key = await _register(client, _UUID_B, "BobBaton")
+
+        with patch("backend.telegram.send_message", side_effect=_capture):
+            await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_B, "timestamp": 1742478000000},
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+            await asyncio.sleep(0)
+
+    assert len(sent_texts) == 1
+    assert "Сигнал" in sent_texts[0], (
+        f"Expected 'Сигнал' keyword in message, got: {sent_texts[0]!r}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_signal_with_geo_send_message_contains_coordinates():
+    """Criterion 1: when geo is provided, Telegram message includes lat/lon coordinates."""
+    sent_texts: list[str] = []
+
+    async def _capture(text: str) -> None:
+        sent_texts.append(text)
+
+    async with make_app_client() as client:
+        api_key = await _register(client, _UUID_C, "GeoUser")
+
+        with patch("backend.telegram.send_message", side_effect=_capture):
+            await client.post(
+                "/api/signal",
+                json={
+                    "user_id": _UUID_C,
+                    "timestamp": 1742478000000,
+                    "geo": {"lat": 55.7558, "lon": 37.6173, "accuracy": 15.0},
+                },
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+            await asyncio.sleep(0)
+
+    assert len(sent_texts) == 1
+    assert "55.7558" in sent_texts[0], (
+        f"Expected lat '55.7558' in message, got: {sent_texts[0]!r}"
+    )
+    assert "37.6173" in sent_texts[0], (
+        f"Expected lon '37.6173' in message, got: {sent_texts[0]!r}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_signal_without_geo_send_message_contains_no_geo_label():
+    """Criterion 1: when geo is null, Telegram message contains 'Без геолокации'."""
+    sent_texts: list[str] = []
+
+    async def _capture(text: str) -> None:
+        sent_texts.append(text)
+
+    async with make_app_client() as client:
+        api_key = await _register(client, _UUID_D, "NoGeoUser")
+
+        with patch("backend.telegram.send_message", side_effect=_capture):
+            await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_D, "timestamp": 1742478000000, "geo": None},
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+            await asyncio.sleep(0)
+
+    assert len(sent_texts) == 1
+    assert "Без геолокации" in sent_texts[0], (
+        f"Expected 'Без геолокации' in message, got: {sent_texts[0]!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — No ERROR logged on successful send (service stays alive)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_send_message_no_error_on_200_response():
+    """Criterion 2: send_message does not raise when Telegram returns 200."""
+    from backend import config as _cfg
+    from backend.telegram import send_message
+
+    send_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/sendMessage"
+
+    # Must complete without exception
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(send_url).mock(return_value=httpx.Response(200, json={"ok": True}))
+        await send_message("Test signal delivery")  # should not raise
+
+
+@pytest.mark.asyncio
+async def test_signal_send_message_uses_configured_chat_id():
+    """Criterion 2: send_message POSTs to Telegram with the configured CHAT_ID."""
+    from backend import config as _cfg
+    from backend.telegram import send_message
+
+    send_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/sendMessage"
+
+    with respx.mock(assert_all_called=False) as mock:
+        route = mock.post(send_url).mock(
+            return_value=httpx.Response(200, json={"ok": True})
+        )
+        await send_message("Delivery check")
+
+    assert route.called
+    body = json.loads(route.calls[0].request.content)
+    assert body["chat_id"] == _cfg.CHAT_ID, (
+        f"Expected chat_id={_cfg.CHAT_ID!r}, got {body['chat_id']!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — Repeated requests are also delivered
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_repeated_signals_each_trigger_send_message():
+    """Criterion 3: two consecutive signals each cause a separate send_message call."""
+    sent_texts: list[str] = []
+
+    async def _capture(text: str) -> None:
+        sent_texts.append(text)
+
+    async with make_app_client() as client:
+        api_key = await _register(client, _UUID_E, "RepeatUser")
+
+        with patch("backend.telegram.send_message", side_effect=_capture):
+            r1 = await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_E, "timestamp": 1742478000001},
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+            await asyncio.sleep(0)
+
+            r2 = await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_E, "timestamp": 1742478000002},
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+            await asyncio.sleep(0)
+
+    assert r1.status_code == 200
+    assert r2.status_code == 200
+    assert len(sent_texts) == 2, (
+        f"Expected 2 send_message calls for 2 signals, got {len(sent_texts)}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_repeated_signals_produce_incrementing_signal_ids():
+    """Criterion 3: repeated signals are each stored and return distinct incrementing signal_ids."""
+    async with make_app_client() as client:
+        api_key = await _register(client, _UUID_E, "RepeatUser2")
+        r1 = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_E, "timestamp": 1742478000001},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+        r2 = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_E, "timestamp": 1742478000002},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+
+    assert r1.status_code == 200
+    assert r2.status_code == 200
+    assert r2.json()["signal_id"] > r1.json()["signal_id"], (
+        "Second signal must have a higher signal_id than the first"
+    )
diff --git a/tests/test_db.py b/tests/test_db.py
index 6a9aabd..e823fc4 100644
--- a/tests/test_db.py
+++ b/tests/test_db.py
@@ -109,10 +109,9 @@ async def test_init_db_synchronous():
         await db.init_db()
         # Check synchronous on a new connection via _get_conn()
         from backend.db import _get_conn
-        conn = await _get_conn()
-        async with conn.execute("PRAGMA synchronous") as cur:
-            row = await cur.fetchone()
-        await conn.close()
+        async with _get_conn() as conn:
+            async with conn.execute("PRAGMA synchronous") as cur:
+                row = await cur.fetchone()
         # 1 == NORMAL
         assert row[0] == 1
     finally:
diff --git a/tests/test_models.py b/tests/test_models.py
index 2b902c7..0e55586 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -46,11 +46,11 @@ def test_register_request_empty_uuid():
 def test_register_request_name_max_length():
     """name longer than 100 chars raises ValidationError."""
     with pytest.raises(ValidationError):
-        RegisterRequest(uuid="some-uuid", name="x" * 101)
+        RegisterRequest(uuid="550e8400-e29b-41d4-a716-446655440000", name="x" * 101)
 
 
 def test_register_request_name_exactly_100():
-    req = RegisterRequest(uuid="some-uuid", name="x" * 100)
+    req = RegisterRequest(uuid="550e8400-e29b-41d4-a716-446655440000", name="x" * 100)
     assert len(req.name) == 100
 
 
@@ -116,7 +116,7 @@ def test_signal_request_valid():
 
 def test_signal_request_no_geo():
     req = SignalRequest(
-        user_id="some-uuid",
+        user_id="550e8400-e29b-41d4-a716-446655440000",
         timestamp=1742478000000,
         geo=None,
     )
@@ -136,9 +136,9 @@ def test_signal_request_empty_user_id():
 def test_signal_request_timestamp_zero():
     """timestamp must be > 0."""
     with pytest.raises(ValidationError):
-        SignalRequest(user_id="some-uuid", timestamp=0)
+        SignalRequest(user_id="550e8400-e29b-41d4-a716-446655440000", timestamp=0)
 
 
 def test_signal_request_timestamp_negative():
     with pytest.raises(ValidationError):
-        SignalRequest(user_id="some-uuid", timestamp=-1)
+        SignalRequest(user_id="550e8400-e29b-41d4-a716-446655440000", timestamp=-1)
diff --git a/tests/test_register.py b/tests/test_register.py
index fb05341..0f69d24 100644
--- a/tests/test_register.py
+++ b/tests/test_register.py
@@ -1,5 +1,11 @@
 """
 Integration tests for POST /api/register.
+
+UUID notes: RegisterRequest.uuid requires a valid UUID v4 pattern
+(^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$).
+All UUID constants below satisfy this constraint.
+
+BATON-SEC-003: /api/register now returns api_key in the response.
 """
 from __future__ import annotations
 
@@ -10,23 +16,34 @@ os.environ.setdefault("CHAT_ID", "-1001234567890")
 os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
 os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
 os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
 
 import pytest
 from tests.conftest import make_app_client
 
+# Valid UUID v4 constants for register tests
+_UUID_REG_1 = "b0000001-0000-4000-8000-000000000001"
+_UUID_REG_2 = "b0000002-0000-4000-8000-000000000002"
+_UUID_REG_3 = "b0000003-0000-4000-8000-000000000003"
+_UUID_REG_4 = "b0000004-0000-4000-8000-000000000004"
+_UUID_REG_5 = "b0000005-0000-4000-8000-000000000005"
+_UUID_REG_6 = "b0000006-0000-4000-8000-000000000006"
+
 
 @pytest.mark.asyncio
 async def test_register_new_user_success():
-    """POST /api/register returns 200 with user_id > 0."""
+    """POST /api/register returns 200 with user_id > 0 and api_key."""
     async with make_app_client() as client:
         resp = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-001", "name": "Alice"},
+            json={"uuid": _UUID_REG_1, "name": "Alice"},
         )
     assert resp.status_code == 200
     data = resp.json()
     assert data["user_id"] > 0
-    assert data["uuid"] == "reg-uuid-001"
+    assert data["uuid"] == _UUID_REG_1
+    assert "api_key" in data
+    assert len(data["api_key"]) == 64  # secrets.token_hex(32) = 64 hex chars
 
 
 @pytest.mark.asyncio
@@ -35,24 +52,42 @@ async def test_register_idempotent():
     async with make_app_client() as client:
         r1 = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-002", "name": "Bob"},
+            json={"uuid": _UUID_REG_2, "name": "Bob"},
         )
         r2 = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-002", "name": "Bob"},
+            json={"uuid": _UUID_REG_2, "name": "Bob"},
         )
     assert r1.status_code == 200
     assert r2.status_code == 200
     assert r1.json()["user_id"] == r2.json()["user_id"]
 
 
+@pytest.mark.asyncio
+async def test_register_idempotent_returns_api_key_on_every_call():
+    """Each registration call returns an api_key (key rotation on re-register)."""
+    async with make_app_client() as client:
+        r1 = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_REG_3, "name": "Carol"},
+        )
+        r2 = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_REG_3, "name": "Carol"},
+        )
+    assert r1.status_code == 200
+    assert r2.status_code == 200
+    assert "api_key" in r1.json()
+    assert "api_key" in r2.json()
+
+
 @pytest.mark.asyncio
 async def test_register_empty_name_returns_422():
     """Empty name must fail validation with 422."""
     async with make_app_client() as client:
         resp = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-003", "name": ""},
+            json={"uuid": _UUID_REG_4, "name": ""},
         )
     assert resp.status_code == 422
 
@@ -74,7 +109,18 @@ async def test_register_missing_name_returns_422():
     async with make_app_client() as client:
         resp = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-004"},
+            json={"uuid": _UUID_REG_4},
+        )
+    assert resp.status_code == 422
+
+
+@pytest.mark.asyncio
+async def test_register_invalid_uuid_format_returns_422():
+    """Non-UUID4 string as uuid must return 422."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/register",
+            json={"uuid": "not-a-uuid", "name": "Dave"},
         )
     assert resp.status_code == 422
 
@@ -85,11 +131,11 @@ async def test_register_user_stored_in_db():
     async with make_app_client() as client:
         r1 = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-005", "name": "Dana"},
+            json={"uuid": _UUID_REG_5, "name": "Dana"},
         )
         r2 = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-005", "name": "Dana"},
+            json={"uuid": _UUID_REG_5, "name": "Dana"},
         )
     assert r1.json()["user_id"] == r2.json()["user_id"]
 
@@ -100,6 +146,6 @@ async def test_register_response_contains_uuid():
     async with make_app_client() as client:
         resp = await client.post(
             "/api/register",
-            json={"uuid": "reg-uuid-006", "name": "Eve"},
+            json={"uuid": _UUID_REG_6, "name": "Eve"},
         )
-    assert resp.json()["uuid"] == "reg-uuid-006"
+    assert resp.json()["uuid"] == _UUID_REG_6
diff --git a/tests/test_sec_002.py b/tests/test_sec_002.py
new file mode 100644
index 0000000..ccf863f
--- /dev/null
+++ b/tests/test_sec_002.py
@@ -0,0 +1,282 @@
+"""
+Tests for BATON-SEC-002:
+1. _get_client_ip() extracts real IP from X-Real-IP / X-Forwarded-For headers.
+2. POST /api/signal returns 429 when the per-IP rate limit is exceeded.
+3. Rate counters for register and signal are independent (separate key namespaces).
+
+UUID notes: RegisterRequest.uuid and SignalRequest.user_id both require a valid
+UUID v4 pattern (^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$).
+All constants below satisfy this constraint.
+
+BATON-SEC-003: POST /api/signal now requires Authorization: Bearer <api_key>.
+_register_and_get_key() helper returns the api_key from the registration response.
+"""
+from __future__ import annotations
+
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import pytest
+from starlette.requests import Request
+
+from backend.middleware import _get_client_ip
+from tests.conftest import make_app_client
+
+# ── Valid UUID v4 constants ──────────────────────────────────────────────────
+# Pattern: xxxxxxxx-xxxx-4xxx-[89ab]xxx-xxxxxxxxxxxx  (all hex chars)
+
+_UUID_SIG_RL  = "a0000001-0000-4000-8000-000000000001"  # rate-limit 429 test
+_UUID_SIG_OK  = "a0000002-0000-4000-8000-000000000002"  # first-10-allowed test
+_UUID_IND_SIG = "a0000003-0000-4000-8000-000000000003"  # independence (exhaust signal)
+_UUID_IND_SIG2 = "a0000033-0000-4000-8000-000000000033"  # second register after exhaust
+_UUID_IND_REG = "a0000004-0000-4000-8000-000000000004"  # independence (exhaust register)
+_UUID_IP_A    = "a0000005-0000-4000-8000-000000000005"  # per-IP isolation, user A
+_UUID_IP_B    = "a0000006-0000-4000-8000-000000000006"  # per-IP isolation, user B
+
+
+# ── Helpers ─────────────────────────────────────────────────────────────────
+
+
+async def _register_and_get_key(client, uuid: str, name: str) -> str:
+    """Register user and return api_key."""
+    r = await client.post("/api/register", json={"uuid": uuid, "name": name})
+    assert r.status_code == 200
+    return r.json()["api_key"]
+
+
+def _make_request(headers: dict | None = None, client_host: str = "127.0.0.1") -> Request:
+    """Build a minimal Starlette Request with given headers and remote address."""
+    scope = {
+        "type": "http",
+        "method": "POST",
+        "path": "/",
+        "headers": [
+            (k.lower().encode(), v.encode())
+            for k, v in (headers or {}).items()
+        ],
+        "client": (client_host, 12345),
+    }
+    return Request(scope)
+
+
+# ── Unit: _get_client_ip ────────────────────────────────────────────────────
+
+
+def test_get_client_ip_returns_x_real_ip_when_present():
+    """X-Real-IP header is returned as-is (highest priority)."""
+    req = _make_request({"X-Real-IP": "203.0.113.10"}, client_host="127.0.0.1")
+    assert _get_client_ip(req) == "203.0.113.10"
+
+
+def test_get_client_ip_ignores_client_host_when_x_real_ip_set():
+    """When X-Real-IP is present, client.host (127.0.0.1) must NOT be returned."""
+    req = _make_request({"X-Real-IP": "10.20.30.40"}, client_host="127.0.0.1")
+    assert _get_client_ip(req) != "127.0.0.1"
+
+
+def test_get_client_ip_uses_x_forwarded_for_when_no_x_real_ip():
+    """X-Forwarded-For is used when X-Real-IP is absent."""
+    req = _make_request({"X-Forwarded-For": "198.51.100.5"}, client_host="127.0.0.1")
+    assert _get_client_ip(req) == "198.51.100.5"
+
+
+def test_get_client_ip_x_forwarded_for_returns_first_ip_in_chain():
+    """When X-Forwarded-For contains a chain, only the first (original) IP is returned."""
+    req = _make_request(
+        {"X-Forwarded-For": "192.0.2.1, 10.0.0.1, 172.16.0.1"},
+        client_host="127.0.0.1",
+    )
+    assert _get_client_ip(req) == "192.0.2.1"
+
+
+def test_get_client_ip_x_real_ip_takes_priority_over_x_forwarded_for():
+    """X-Real-IP beats X-Forwarded-For when both headers are present."""
+    req = _make_request(
+        {"X-Real-IP": "1.1.1.1", "X-Forwarded-For": "2.2.2.2"},
+        client_host="127.0.0.1",
+    )
+    assert _get_client_ip(req) == "1.1.1.1"
+
+
+def test_get_client_ip_falls_back_to_client_host_when_no_proxy_headers():
+    """Without proxy headers, client.host is returned."""
+    req = _make_request(client_host="203.0.113.99")
+    assert _get_client_ip(req) == "203.0.113.99"
+
+
+def test_get_client_ip_returns_unknown_when_no_client_and_no_headers():
+    """If no proxy headers and client is None, 'unknown' is returned."""
+    scope = {
+        "type": "http",
+        "method": "POST",
+        "path": "/",
+        "headers": [],
+        "client": None,
+    }
+    req = Request(scope)
+    assert _get_client_ip(req) == "unknown"
+
+
+# ── Integration: signal rate limit (429) ────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_signal_rate_limit_returns_429_after_10_requests():
+    """POST /api/signal returns 429 on the 11th request from the same IP."""
+    async with make_app_client() as client:
+        api_key = await _register_and_get_key(client, _UUID_SIG_RL, "RL")
+
+        payload = {"user_id": _UUID_SIG_RL, "timestamp": 1742478000000}
+        ip_hdrs = {"X-Real-IP": "5.5.5.5", "Authorization": f"Bearer {api_key}"}
+
+        statuses = []
+        for _ in range(11):
+            r = await client.post("/api/signal", json=payload, headers=ip_hdrs)
+            statuses.append(r.status_code)
+
+    assert statuses[-1] == 429, f"Expected 429 on 11th request, got {statuses}"
+
+
+@pytest.mark.asyncio
+async def test_signal_first_10_requests_are_allowed():
+    """First 10 POST /api/signal requests from the same IP must all return 200."""
+    async with make_app_client() as client:
+        api_key = await _register_and_get_key(client, _UUID_SIG_OK, "OK")
+
+        payload = {"user_id": _UUID_SIG_OK, "timestamp": 1742478000000}
+        ip_hdrs = {"X-Real-IP": "6.6.6.6", "Authorization": f"Bearer {api_key}"}
+
+        statuses = []
+        for _ in range(10):
+            r = await client.post("/api/signal", json=payload, headers=ip_hdrs)
+            statuses.append(r.status_code)
+
+    assert all(s == 200 for s in statuses), (
+        f"Some request(s) before limit returned non-200: {statuses}"
+    )
+
+
+# ── Integration: independence of register and signal rate limits ─────────────
+
+
+@pytest.mark.asyncio
+async def test_signal_rate_limit_does_not_affect_register_counter():
+    """
+    Exhausting the signal rate limit (11 requests) must NOT cause /api/register
+    to return 429 — the counters use different keys ('sig:IP' vs 'IP').
+    """
+    async with make_app_client() as client:
+        ip_hdrs_reg = {"X-Real-IP": "7.7.7.7"}
+
+        # Register a user (increments register counter, key='7.7.7.7', count=1)
+        r_reg = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_IND_SIG, "name": "Ind"},
+            headers=ip_hdrs_reg,
+        )
+        assert r_reg.status_code == 200
+        api_key = r_reg.json()["api_key"]
+
+        # Exhaust signal rate limit for same IP (11 requests, key='sig:7.7.7.7')
+        payload = {"user_id": _UUID_IND_SIG, "timestamp": 1742478000000}
+        ip_hdrs_sig = {"X-Real-IP": "7.7.7.7", "Authorization": f"Bearer {api_key}"}
+        for _ in range(11):
+            await client.post("/api/signal", json=payload, headers=ip_hdrs_sig)
+
+        # Register counter is still at 1 — must allow another registration
+        r_reg2 = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_IND_SIG2, "name": "Ind2"},
+            headers=ip_hdrs_reg,
+        )
+
+    assert r_reg2.status_code == 200, (
+        f"Register returned {r_reg2.status_code} — "
+        "signal exhaustion incorrectly bled into register counter"
+    )
+
+
+@pytest.mark.asyncio
+async def test_register_rate_limit_does_not_affect_signal_counter():
+    """
+    Exhausting the register rate limit (6 requests → 6th returns 429) must NOT
+    prevent subsequent /api/signal requests from the same IP.
+    """
+    async with make_app_client() as client:
+        ip_hdrs = {"X-Real-IP": "8.8.8.8"}
+
+        # First register succeeds and creates the user we'll signal later
+        r0 = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_IND_REG, "name": "Reg"},
+            headers=ip_hdrs,
+        )
+        assert r0.status_code == 200
+        api_key = r0.json()["api_key"]
+
+        # Send 4 more register requests from the same IP (requests 2-5 succeed,
+        # each rotates the api_key; request 6 would be 429).
+        # We keep track of the last api_key since re-registration rotates it.
+        for _ in range(4):
+            r = await client.post(
+                "/api/register",
+                json={"uuid": _UUID_IND_REG, "name": "Reg"},
+                headers=ip_hdrs,
+            )
+            if r.status_code == 200:
+                api_key = r.json()["api_key"]
+
+        # 6th request → 429 (exhausts limit without rotating key)
+        await client.post(
+            "/api/register",
+            json={"uuid": _UUID_IND_REG, "name": "Reg"},
+            headers=ip_hdrs,
+        )
+
+        # Signal must still succeed — signal counter (key='sig:8.8.8.8') is still 0
+        r_sig = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_IND_REG, "timestamp": 1742478000000},
+            headers={"X-Real-IP": "8.8.8.8", "Authorization": f"Bearer {api_key}"},
+        )
+
+    assert r_sig.status_code == 200, (
+        f"Signal returned {r_sig.status_code} — "
+        "register exhaustion incorrectly bled into signal counter"
+    )
+
+
+# ── Integration: signal rate limit is per-IP ─────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_signal_rate_limit_is_per_ip_different_ips_are_independent():
+    """
+    Rate limit counters are per-IP — exhausting for IP A must not block IP B.
+    """
+    async with make_app_client() as client:
+        api_key_a = await _register_and_get_key(client, _UUID_IP_A, "IPA")
+        api_key_b = await _register_and_get_key(client, _UUID_IP_B, "IPB")
+
+        # Exhaust rate limit for IP A (11 requests → 11th is 429)
+        for _ in range(11):
+            await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_IP_A, "timestamp": 1742478000000},
+                headers={"X-Real-IP": "11.11.11.11", "Authorization": f"Bearer {api_key_a}"},
+            )
+
+        # IP B should still be allowed (independent counter)
+        r = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_IP_B, "timestamp": 1742478000000},
+            headers={"X-Real-IP": "22.22.22.22", "Authorization": f"Bearer {api_key_b}"},
+        )
+
+    assert r.status_code == 200, f"IP B was incorrectly blocked: {r.status_code}"
diff --git a/tests/test_sec_003.py b/tests/test_sec_003.py
new file mode 100644
index 0000000..cb04e53
--- /dev/null
+++ b/tests/test_sec_003.py
@@ -0,0 +1,298 @@
+"""
+Tests for BATON-SEC-003: API-ключи для аутентификации /api/signal.
+
+Acceptance criteria:
+1. POST /api/register возвращает api_key длиной 64 hex-символа.
+2. POST /api/signal без Authorization header → 401.
+3. POST /api/signal с неверным api_key → 401.
+4. POST /api/signal с правильным api_key → 200.
+5. Повторная регистрация генерирует новый api_key (ротация ключа).
+6. Старый api_key становится недействительным после ротации.
+7. Новый api_key работает после ротации.
+8. SHA-256 хэш api_key сохраняется в БД, сырой ключ — нет (проверка через DB функцию).
+
+UUID notes: все UUID ниже удовлетворяют паттерну UUID v4.
+"""
+from __future__ import annotations
+
+import hashlib
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import pytest
+
+from backend import db
+from tests.conftest import make_app_client, temp_db
+from backend import config
+
+# Valid UUID v4 constants
+_UUID_1 = "aa000001-0000-4000-8000-000000000001"
+_UUID_2 = "aa000002-0000-4000-8000-000000000002"
+_UUID_3 = "aa000003-0000-4000-8000-000000000003"
+_UUID_4 = "aa000004-0000-4000-8000-000000000004"
+_UUID_5 = "aa000005-0000-4000-8000-000000000005"
+_UUID_6 = "aa000006-0000-4000-8000-000000000006"
+_UUID_7 = "aa000007-0000-4000-8000-000000000007"
+_UUID_8 = "aa000008-0000-4000-8000-000000000008"
+_UUID_9 = "aa000009-0000-4000-8000-000000000009"
+_UUID_10 = "aa00000a-0000-4000-8000-00000000000a"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — /api/register returns api_key of correct length
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_register_returns_api_key():
+    """POST /api/register должен вернуть поле api_key в ответе."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_1, "name": "Alice"},
+        )
+    assert resp.status_code == 200
+    assert "api_key" in resp.json()
+
+
+@pytest.mark.asyncio
+async def test_register_api_key_is_64_hex_chars():
+    """api_key должен быть строкой из 64 hex-символов (secrets.token_hex(32))."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_2, "name": "Bob"},
+        )
+    api_key = resp.json()["api_key"]
+    assert len(api_key) == 64
+    assert all(c in "0123456789abcdef" for c in api_key), (
+        f"api_key contains non-hex characters: {api_key}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — Missing Authorization → 401
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_without_auth_header_returns_401():
+    """POST /api/signal без Authorization header должен вернуть 401."""
+    async with make_app_client() as client:
+        await client.post("/api/register", json={"uuid": _UUID_3, "name": "Charlie"})
+        resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_3, "timestamp": 1742478000000},
+        )
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_signal_without_bearer_scheme_returns_401():
+    """POST /api/signal с неверной схемой (Basic вместо Bearer) должен вернуть 401."""
+    async with make_app_client() as client:
+        await client.post("/api/register", json={"uuid": _UUID_3, "name": "Charlie"})
+        resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_3, "timestamp": 1742478000000},
+            headers={"Authorization": "Basic wrongtoken"},
+        )
+    assert resp.status_code == 401
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — Wrong api_key → 401
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_with_wrong_api_key_returns_401():
+    """POST /api/signal с неверным api_key должен вернуть 401."""
+    async with make_app_client() as client:
+        await client.post("/api/register", json={"uuid": _UUID_4, "name": "Dave"})
+        resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_4, "timestamp": 1742478000000},
+            headers={"Authorization": "Bearer " + "0" * 64},
+        )
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_signal_with_unknown_user_returns_401():
+    """POST /api/signal с api_key незарегистрированного пользователя должен вернуть 401."""
+    async with make_app_client() as client:
+        resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_5, "timestamp": 1742478000000},
+            headers={"Authorization": "Bearer " + "a" * 64},
+        )
+    assert resp.status_code == 401
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — Correct api_key → 200
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_with_valid_api_key_returns_200():
+    """POST /api/signal с правильным api_key должен вернуть 200."""
+    async with make_app_client() as client:
+        reg = await client.post(
+            "/api/register",
+            json={"uuid": _UUID_6, "name": "Eve"},
+        )
+        assert reg.status_code == 200
+        api_key = reg.json()["api_key"]
+
+        resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_6, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {api_key}"},
+        )
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "ok"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5-7 — Key rotation on re-register
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_re_register_produces_new_api_key():
+    """Повторная регистрация должна возвращать новый api_key (ротация)."""
+    async with make_app_client() as client:
+        r1 = await client.post("/api/register", json={"uuid": _UUID_7, "name": "Frank"})
+        r2 = await client.post("/api/register", json={"uuid": _UUID_7, "name": "Frank"})
+
+    assert r1.status_code == 200
+    assert r2.status_code == 200
+    # Ключи могут совпасть (очень маловероятно), но оба должны быть длиной 64
+    assert len(r2.json()["api_key"]) == 64
+
+
+@pytest.mark.asyncio
+async def test_old_api_key_invalid_after_re_register():
+    """После повторной регистрации старый api_key не должен работать."""
+    async with make_app_client() as client:
+        r1 = await client.post("/api/register", json={"uuid": _UUID_8, "name": "Grace"})
+        old_key = r1.json()["api_key"]
+
+        # Повторная регистрация — ротация ключа
+        r2 = await client.post("/api/register", json={"uuid": _UUID_8, "name": "Grace"})
+        new_key = r2.json()["api_key"]
+
+        # Старый ключ больше не должен работать
+        old_resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_8, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {old_key}"},
+        )
+
+        # Новый ключ должен работать
+        new_resp = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_8, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {new_key}"},
+        )
+
+    assert old_resp.status_code == 401, "Старый ключ должен быть недействителен после ротации"
+    assert new_resp.status_code == 200, "Новый ключ должен работать"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 5 (task brief) — Token from another user → 401
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_with_other_user_token_returns_401():
+    """POST /api/signal с токеном другого пользователя должен вернуть 401.
+
+    Невозможно отправить сигнал от чужого имени даже зная UUID.
+    """
+    async with make_app_client() as client:
+        # Регистрируем двух пользователей
+        r_a = await client.post("/api/register", json={"uuid": _UUID_9, "name": "UserA"})
+        r_b = await client.post("/api/register", json={"uuid": _UUID_10, "name": "UserB"})
+        assert r_a.status_code == 200
+        assert r_b.status_code == 200
+        api_key_a = r_a.json()["api_key"]
+        api_key_b = r_b.json()["api_key"]
+
+        # UserA пытается отправить сигнал с токеном UserB
+        resp_a_with_b_key = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_9, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {api_key_b}"},
+        )
+
+        # UserB пытается отправить сигнал с токеном UserA
+        resp_b_with_a_key = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_10, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {api_key_a}"},
+        )
+
+    assert resp_a_with_b_key.status_code == 401, (
+        "Нельзя отправить сигнал от имени UserA с токеном UserB"
+    )
+    assert resp_b_with_a_key.status_code == 401, (
+        "Нельзя отправить сигнал от имени UserB с токеном UserA"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 8 — SHA-256 hash is stored, not the raw key
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_api_key_hash_stored_in_db_not_raw_key():
+    """В БД должен храниться SHA-256 хэш api_key, а не сырой ключ."""
+    with temp_db():
+        from backend.main import app
+        import contextlib
+        import httpx
+        import respx
+        from httpx import AsyncClient, ASGITransport
+
+        tg_set_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"
+        send_url = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
+
+        mock_router = respx.mock(assert_all_called=False)
+        mock_router.post(tg_set_url).mock(
+            return_value=httpx.Response(200, json={"ok": True, "result": True})
+        )
+        mock_router.post(send_url).mock(
+            return_value=httpx.Response(200, json={"ok": True})
+        )
+
+        with mock_router:
+            async with app.router.lifespan_context(app):
+                transport = ASGITransport(app=app)
+                async with AsyncClient(transport=transport, base_url="http://testserver") as client:
+                    reg = await client.post(
+                        "/api/register",
+                        json={"uuid": _UUID_1, "name": "HashTest"},
+                    )
+                    assert reg.status_code == 200
+                    raw_api_key = reg.json()["api_key"]
+
+                    # Читаем хэш из БД напрямую
+                    stored_hash = await db.get_api_key_hash_by_uuid(_UUID_1)
+
+    expected_hash = hashlib.sha256(raw_api_key.encode()).hexdigest()
+    assert stored_hash is not None, "api_key_hash должен быть в БД"
+    assert stored_hash == expected_hash, (
+        "В БД должен быть SHA-256 хэш, а не сырой ключ"
+    )
+    assert stored_hash != raw_api_key, "В БД не должен храниться сырой ключ"
diff --git a/tests/test_sec_006.py b/tests/test_sec_006.py
new file mode 100644
index 0000000..e0db144
--- /dev/null
+++ b/tests/test_sec_006.py
@@ -0,0 +1,337 @@
+"""
+Tests for BATON-SEC-006: Персистентное хранение rate-limit счётчиков.
+
+Acceptance criteria:
+1. Счётчики сохраняются между пересозданием экземпляра приложения (симуляция рестарта).
+2. TTL-очистка корректно сбрасывает устаревшие записи после истечения окна.
+3. Превышение лимита возвращает HTTP 429.
+4. X-Real-IP и X-Forwarded-For корректно парсятся для подсчёта.
+
+UUID note: All UUIDs below satisfy the v4 pattern validated since BATON-SEC-005.
+"""
+from __future__ import annotations
+
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+import tempfile
+import unittest.mock as mock
+
+import aiosqlite
+import pytest
+
+from backend import config, db
+from tests.conftest import make_app_client
+
+# ── Valid UUID v4 constants ──────────────────────────────────────────────────
+
+_UUID_XREALIP_A = "c0000001-0000-4000-8000-000000000001"  # X-Real-IP exhaustion
+_UUID_XREALIP_B = "c0000002-0000-4000-8000-000000000002"  # IP-B (independent counter)
+_UUID_XFWD      = "c0000003-0000-4000-8000-000000000003"  # X-Forwarded-For test
+_UUID_REG_RL    = "c0000004-0000-4000-8000-000000000004"  # register 429 test
+
+
+# ── Helpers ──────────────────────────────────────────────────────────────────
+
+
+def _tmpdb() -> str:
+    """Set config.DB_PATH to a fresh temp file and return the path."""
+    path = tempfile.mktemp(suffix=".db")
+    config.DB_PATH = path
+    return path
+
+
+def _cleanup(path: str) -> None:
+    for ext in ("", "-wal", "-shm"):
+        try:
+            os.unlink(path + ext)
+        except FileNotFoundError:
+            pass
+
+
+# ── Criterion 1: Persistence across restart ───────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_rate_limits_table_created_by_init_db():
+    """init_db() creates the rate_limits table in SQLite."""
+    path = _tmpdb()
+    try:
+        await db.init_db()
+        async with aiosqlite.connect(path) as conn:
+            async with conn.execute(
+                "SELECT name FROM sqlite_master WHERE type='table' AND name='rate_limits'"
+            ) as cur:
+                row = await cur.fetchone()
+        assert row is not None, "rate_limits table not found after init_db()"
+    finally:
+        _cleanup(path)
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_counter_persists_after_db_reinit():
+    """Counter survives re-initialization of the DB (simulates app restart).
+
+    Before: in-memory app.state.rate_counters was lost on restart.
+    After: SQLite-backed rate_limits table persists across init_db() calls.
+    """
+    path = _tmpdb()
+    try:
+        await db.init_db()
+
+        c1 = await db.rate_limit_increment("persist:test", 600)
+        c2 = await db.rate_limit_increment("persist:test", 600)
+        c3 = await db.rate_limit_increment("persist:test", 600)
+        assert c3 == 3, f"Expected 3 after 3 increments, got {c3}"
+
+        # Simulate restart: re-initialize DB against the same file
+        await db.init_db()
+
+        # Counter must continue from 3, not reset to 0
+        c4 = await db.rate_limit_increment("persist:test", 600)
+        assert c4 == 4, (
+            f"Expected 4 after reinit + 1 more increment (counter must persist), got {c4}"
+        )
+    finally:
+        _cleanup(path)
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_increment_returns_sequential_counts():
+    """rate_limit_increment returns 1, 2, 3 on successive calls within window."""
+    path = _tmpdb()
+    try:
+        await db.init_db()
+        c1 = await db.rate_limit_increment("seq:test", 600)
+        c2 = await db.rate_limit_increment("seq:test", 600)
+        c3 = await db.rate_limit_increment("seq:test", 600)
+        assert (c1, c2, c3) == (1, 2, 3), f"Expected (1,2,3), got ({c1},{c2},{c3})"
+    finally:
+        _cleanup(path)
+
+
+# ── Criterion 2: TTL cleanup resets stale entries ────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_ttl_resets_counter_after_window_expires():
+    """Counter resets to 1 when the time window has expired (TTL cleanup).
+
+    time.time() is mocked — no real sleep required.
+    """
+    path = _tmpdb()
+    try:
+        await db.init_db()
+
+        with mock.patch("backend.db.time") as mock_time:
+            mock_time.time.return_value = 1000.0  # window_start = t0
+
+            c1 = await db.rate_limit_increment("ttl:test", 10)
+            c2 = await db.rate_limit_increment("ttl:test", 10)
+            c3 = await db.rate_limit_increment("ttl:test", 10)
+            assert c3 == 3
+
+            # Jump 11 seconds ahead (window = 10s → expired)
+            mock_time.time.return_value = 1011.0
+
+            c4 = await db.rate_limit_increment("ttl:test", 10)
+
+        assert c4 == 1, (
+            f"Expected counter reset to 1 after window expired, got {c4}"
+        )
+    finally:
+        _cleanup(path)
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_ttl_does_not_reset_within_window():
+    """Counter is NOT reset when the window has NOT expired yet."""
+    path = _tmpdb()
+    try:
+        await db.init_db()
+
+        with mock.patch("backend.db.time") as mock_time:
+            mock_time.time.return_value = 1000.0
+
+            await db.rate_limit_increment("ttl:within", 10)
+            await db.rate_limit_increment("ttl:within", 10)
+            c3 = await db.rate_limit_increment("ttl:within", 10)
+            assert c3 == 3
+
+            # Only 5 seconds passed (window = 10s, still active)
+            mock_time.time.return_value = 1005.0
+
+            c4 = await db.rate_limit_increment("ttl:within", 10)
+
+        assert c4 == 4, (
+            f"Expected 4 (counter continues inside window), got {c4}"
+        )
+    finally:
+        _cleanup(path)
+
+
+@pytest.mark.asyncio
+async def test_rate_limit_ttl_boundary_exactly_at_window_end():
+    """Counter resets when elapsed time equals exactly the window duration."""
+    path = _tmpdb()
+    try:
+        await db.init_db()
+
+        with mock.patch("backend.db.time") as mock_time:
+            mock_time.time.return_value = 1000.0
+
+            await db.rate_limit_increment("ttl:boundary", 10)
+            await db.rate_limit_increment("ttl:boundary", 10)
+
+            # Exactly at window boundary (elapsed == window → stale)
+            mock_time.time.return_value = 1010.0
+
+            c = await db.rate_limit_increment("ttl:boundary", 10)
+
+        assert c == 1, (
+            f"Expected reset at exact window boundary (elapsed == window), got {c}"
+        )
+    finally:
+        _cleanup(path)
+
+
+# ── Criterion 3: HTTP 429 when rate limit exceeded ────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_register_returns_429_after_rate_limit_exceeded():
+    """POST /api/register returns 429 on the 6th request from the same IP.
+
+    Register limit = 5 requests per 600s window.
+    """
+    async with make_app_client() as client:
+        ip_hdrs = {"X-Real-IP": "192.0.2.10"}
+        statuses = []
+        for _ in range(6):
+            r = await client.post(
+                "/api/register",
+                json={"uuid": _UUID_REG_RL, "name": "RateLimitTest"},
+                headers=ip_hdrs,
+            )
+            statuses.append(r.status_code)
+
+    assert statuses[-1] == 429, (
+        f"Expected 429 on 6th register request, got statuses: {statuses}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_register_first_5_requests_are_allowed():
+    """First 5 POST /api/register requests from the same IP must all return 200."""
+    async with make_app_client() as client:
+        ip_hdrs = {"X-Real-IP": "192.0.2.11"}
+        statuses = []
+        for _ in range(5):
+            r = await client.post(
+                "/api/register",
+                json={"uuid": _UUID_REG_RL, "name": "RateLimitTest"},
+                headers=ip_hdrs,
+            )
+            statuses.append(r.status_code)
+
+    assert all(s == 200 for s in statuses), (
+        f"Expected all 5 register requests to return 200, got: {statuses}"
+    )
+
+
+# ── Criterion 4: X-Real-IP and X-Forwarded-For for rate counting ──────────────
+
+
+@pytest.mark.asyncio
+async def test_x_real_ip_header_is_used_for_rate_counting():
+    """Rate counter keys are derived from X-Real-IP: two requests sharing
+    the same X-Real-IP share the same counter and collectively hit the 429 limit.
+    """
+    async with make_app_client() as client:
+        await client.post(
+            "/api/register", json={"uuid": _UUID_XREALIP_A, "name": "RealIPUser"}
+        )
+
+        ip_hdrs = {"X-Real-IP": "203.0.113.10"}
+        payload = {"user_id": _UUID_XREALIP_A, "timestamp": 1742478000000}
+
+        statuses = []
+        for _ in range(11):
+            r = await client.post("/api/signal", json=payload, headers=ip_hdrs)
+            statuses.append(r.status_code)
+
+    assert statuses[-1] == 429, (
+        f"Expected 429 on 11th signal with same X-Real-IP, got: {statuses}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_x_forwarded_for_header_is_used_for_rate_counting():
+    """Rate counter keys are derived from X-Forwarded-For (first IP) when
+    X-Real-IP is absent: requests sharing the same forwarded IP hit the limit.
+    """
+    async with make_app_client() as client:
+        await client.post(
+            "/api/register", json={"uuid": _UUID_XFWD, "name": "FwdUser"}
+        )
+
+        # Chain: first IP is the original client (only that one is used)
+        fwd_hdrs = {"X-Forwarded-For": "198.51.100.5, 10.0.0.1, 172.16.0.1"}
+        payload = {"user_id": _UUID_XFWD, "timestamp": 1742478000000}
+
+        statuses = []
+        for _ in range(11):
+            r = await client.post("/api/signal", json=payload, headers=fwd_hdrs)
+            statuses.append(r.status_code)
+
+    assert statuses[-1] == 429, (
+        f"Expected 429 on 11th request with same X-Forwarded-For first IP, got: {statuses}"
+    )
+
+
+@pytest.mark.asyncio
+async def test_different_x_real_ip_values_have_independent_counters():
+    """Exhausting the rate limit for IP-A must not block IP-B.
+
+    Verifies that rate-limit keys are truly per-IP.
+    """
+    async with make_app_client() as client:
+        r_a = await client.post(
+            "/api/register", json={"uuid": _UUID_XREALIP_A, "name": "IPA"}
+        )
+        r_b = await client.post(
+            "/api/register", json={"uuid": _UUID_XREALIP_B, "name": "IPB"}
+        )
+        api_key_a = r_a.json()["api_key"]
+        api_key_b = r_b.json()["api_key"]
+
+        # Exhaust limit for IP-A (with valid auth so requests reach the rate limiter)
+        for _ in range(11):
+            await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_XREALIP_A, "timestamp": 1742478000000},
+                headers={
+                    "X-Real-IP": "198.51.100.100",
+                    "Authorization": f"Bearer {api_key_a}",
+                },
+            )
+
+        # IP-B has its own independent counter — must not be blocked
+        r = await client.post(
+            "/api/signal",
+            json={"user_id": _UUID_XREALIP_B, "timestamp": 1742478000000},
+            headers={
+                "X-Real-IP": "198.51.100.200",
+                "Authorization": f"Bearer {api_key_b}",
+            },
+        )
+
+    assert r.status_code == 200, (
+        f"IP-B was incorrectly blocked after IP-A exhausted its counter: {r.status_code}"
+    )
diff --git a/tests/test_sec_007.py b/tests/test_sec_007.py
new file mode 100644
index 0000000..a6c3383
--- /dev/null
+++ b/tests/test_sec_007.py
@@ -0,0 +1,240 @@
+"""
+Regression tests for BATON-SEC-007:
+
+1. Retry loop in telegram.py is bounded to exactly 3 attempts.
+2. Exponential backoff applies correctly: sleep = retry_after * (attempt + 1).
+3. POST /api/signal uses asyncio.create_task — HTTP response is not blocked
+   by Telegram rate-limit pauses.
+4. GET /health returns only {"status": "ok"} — no timestamp field.
+
+BATON-SEC-003: POST /api/signal now requires Authorization: Bearer <api_key>.
+Tests that send signals now register first and use the returned api_key.
+"""
+from __future__ import annotations
+
+import asyncio
+import logging
+import os
+
+os.environ.setdefault("BOT_TOKEN", "test-bot-token")
+os.environ.setdefault("CHAT_ID", "-1001234567890")
+os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
+os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
+os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
+
+from unittest.mock import AsyncMock, patch
+
+import httpx
+import pytest
+import respx
+
+from backend import config
+from backend.telegram import send_message
+from tests.conftest import make_app_client
+
+SEND_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
+
+# Valid UUID v4 constants
+_UUID_CT   = "d4e5f6a7-b8c9-4d0e-a1b2-c3d4e5f6a7b8"
+_UUID_SLOW = "e5f6a7b8-c9d0-4e1f-a2b3-c4d5e6f7a8b9"
+
+
+# ---------------------------------------------------------------------------
+# Criterion 1 — retry loop is bounded to max 3 attempts
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_retry_loop_stops_after_3_attempts_on_all_429():
+    """When all 3 responses are 429, send_message makes exactly 3 HTTP requests and stops."""
+    responses = [
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}}),
+    ]
+    with respx.mock(assert_all_called=False) as mock:
+        route = mock.post(SEND_URL).mock(side_effect=responses)
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
+            await send_message("test max 3 attempts")
+
+    assert route.call_count == 3
+
+
+@pytest.mark.asyncio
+async def test_retry_loop_does_not_make_4th_attempt_on_all_429():
+    """send_message must never attempt a 4th request when the first 3 all return 429."""
+    call_count = 0
+
+    async def _count_and_return_429(_request):
+        nonlocal call_count
+        call_count += 1
+        return httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}})
+
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(side_effect=_count_and_return_429)
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
+            await send_message("test no 4th attempt")
+
+    assert call_count == 3
+
+
+# ---------------------------------------------------------------------------
+# Criterion 2 — exponential backoff: sleep = retry_after * (attempt + 1)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_retry_429_first_attempt_sleeps_retry_after_times_1():
+    """First 429 (attempt 0): sleep duration must be retry_after * 1."""
+    retry_after = 7
+    responses = [
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": retry_after}}),
+        httpx.Response(200, json={"ok": True}),
+    ]
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(side_effect=responses)
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock) as mock_sleep:
+            await send_message("test attempt 0 backoff")
+
+    mock_sleep.assert_called_once_with(retry_after * 1)
+
+
+@pytest.mark.asyncio
+async def test_retry_429_exponential_backoff_sleep_sequence():
+    """Two consecutive 429 responses produce sleep = retry_after*1 then retry_after*2."""
+    retry_after = 10
+    responses = [
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": retry_after}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": retry_after}}),
+        httpx.Response(200, json={"ok": True}),
+    ]
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(side_effect=responses)
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock) as mock_sleep:
+            await send_message("test backoff sequence")
+
+    sleep_args = [c.args[0] for c in mock_sleep.call_args_list]
+    assert retry_after * 1 in sleep_args, f"Expected sleep({retry_after}) not found in {sleep_args}"
+    assert retry_after * 2 in sleep_args, f"Expected sleep({retry_after * 2}) not found in {sleep_args}"
+
+
+@pytest.mark.asyncio
+async def test_retry_429_third_attempt_sleeps_retry_after_times_3():
+    """Third 429 (attempt 2): sleep duration must be retry_after * 3."""
+    retry_after = 5
+    responses = [
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": retry_after}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": retry_after}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": retry_after}}),
+    ]
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(side_effect=responses)
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock) as mock_sleep:
+            await send_message("test attempt 2 backoff")
+
+    sleep_args = [c.args[0] for c in mock_sleep.call_args_list]
+    assert retry_after * 3 in sleep_args, f"Expected sleep({retry_after * 3}) not found in {sleep_args}"
+
+
+# ---------------------------------------------------------------------------
+# After exhausting all 3 attempts — error is logged
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_send_message_all_attempts_exhausted_logs_error(caplog):
+    """After 3 failed 429 attempts, an ERROR containing 'all 3 attempts' is logged."""
+    responses = [
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}}),
+        httpx.Response(429, json={"ok": False, "parameters": {"retry_after": 1}}),
+    ]
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(side_effect=responses)
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
+            with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+                await send_message("test exhausted log")
+
+    error_messages = [r.message for r in caplog.records if r.levelno == logging.ERROR]
+    assert any("all 3 attempts" in m.lower() for m in error_messages), (
+        f"Expected 'all 3 attempts' in error logs, got: {error_messages}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# Criterion 3 — POST /api/signal uses asyncio.create_task (non-blocking)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_signal_uses_create_task_for_telegram_send_message():
+    """POST /api/signal must wrap telegram.send_message in asyncio.create_task."""
+    with patch("backend.main.asyncio.create_task", wraps=asyncio.create_task) as mock_ct:
+        async with make_app_client() as client:
+            reg = await client.post("/api/register", json={"uuid": _UUID_CT, "name": "CT"})
+            assert reg.status_code == 200
+            api_key = reg.json()["api_key"]
+            resp = await client.post(
+                "/api/signal",
+                json={"user_id": _UUID_CT, "timestamp": 1742478000000},
+                headers={"Authorization": f"Bearer {api_key}"},
+            )
+
+    assert resp.status_code == 200
+    assert mock_ct.called, "asyncio.create_task was never called — send_message may have been awaited directly"
+
+
+@pytest.mark.asyncio
+async def test_signal_response_returns_before_telegram_completes():
+    """POST /api/signal returns 200 even when Telegram send_message is delayed."""
+    slow_sleep_called = False
+
+    async def slow_send_message(_text: str) -> None:
+        nonlocal slow_sleep_called
+        slow_sleep_called = True
+        await asyncio.sleep(9999)  # would block forever if awaited
+
+    with patch("backend.main.telegram.send_message", side_effect=slow_send_message):
+        with patch("backend.main.asyncio.create_task", wraps=asyncio.create_task):
+            async with make_app_client() as client:
+                reg = await client.post(
+                    "/api/register",
+                    json={"uuid": _UUID_SLOW, "name": "Slow"},
+                )
+                assert reg.status_code == 200
+                api_key = reg.json()["api_key"]
+                resp = await client.post(
+                    "/api/signal",
+                    json={
+                        "user_id": _UUID_SLOW,
+                        "timestamp": 1742478000000,
+                    },
+                    headers={"Authorization": f"Bearer {api_key}"},
+                )
+
+    assert resp.status_code == 200
+
+
+# ---------------------------------------------------------------------------
+# Criterion 4 — GET /health exact response body (regression guard)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_health_response_is_exactly_status_ok():
+    """GET /health body must be exactly {"status": "ok"} — no extra fields."""
+    async with make_app_client() as client:
+        response = await client.get("/health")
+
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}
+
+
+@pytest.mark.asyncio
+async def test_health_no_timestamp_field():
+    """GET /health must not expose a timestamp field (time-based fingerprinting prevention)."""
+    async with make_app_client() as client:
+        response = await client.get("/health")
+
+    assert "timestamp" not in response.json()
diff --git a/tests/test_signal.py b/tests/test_signal.py
index 83a86af..1ed0fc2 100644
--- a/tests/test_signal.py
+++ b/tests/test_signal.py
@@ -1,5 +1,11 @@
 """
 Integration tests for POST /api/signal.
+
+UUID notes: both RegisterRequest.uuid and SignalRequest.user_id require valid UUID v4.
+All UUID constants below satisfy the pattern.
+
+BATON-SEC-003: /api/signal now requires Authorization: Bearer <api_key>.
+The _register() helper returns the api_key from the registration response.
 """
 from __future__ import annotations
 
@@ -10,30 +16,42 @@ os.environ.setdefault("CHAT_ID", "-1001234567890")
 os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
 os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
 os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
+os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")
 
 import pytest
 from httpx import AsyncClient
 
 from tests.conftest import make_app_client
 
+# Valid UUID v4 constants for signal tests
+_UUID_1 = "c0000001-0000-4000-8000-000000000001"
+_UUID_2 = "c0000002-0000-4000-8000-000000000002"
+_UUID_3 = "c0000003-0000-4000-8000-000000000003"
+_UUID_4 = "c0000004-0000-4000-8000-000000000004"
+_UUID_5 = "c0000005-0000-4000-8000-000000000005"
+_UUID_6 = "c0000006-0000-4000-8000-000000000006"
 
-async def _register(client: AsyncClient, uuid: str, name: str) -> None:
+
+async def _register(client: AsyncClient, uuid: str, name: str) -> str:
+    """Register user, assert success, return raw api_key."""
     r = await client.post("/api/register", json={"uuid": uuid, "name": name})
-    assert r.status_code == 200
+    assert r.status_code == 200, f"Registration failed: {r.status_code} {r.text}"
+    return r.json()["api_key"]
 
 
 @pytest.mark.asyncio
 async def test_signal_with_geo_success():
     """POST /api/signal with geo returns 200 and signal_id > 0."""
     async with make_app_client() as client:
-        await _register(client, "sig-uuid-001", "Alice")
+        api_key = await _register(client, _UUID_1, "Alice")
         resp = await client.post(
             "/api/signal",
             json={
-                "user_id": "sig-uuid-001",
+                "user_id": _UUID_1,
                 "timestamp": 1742478000000,
                 "geo": {"lat": 55.7558, "lon": 37.6173, "accuracy": 15.0},
             },
+            headers={"Authorization": f"Bearer {api_key}"},
         )
     assert resp.status_code == 200
     data = resp.json()
@@ -45,14 +63,15 @@ async def test_signal_with_geo_success():
 async def test_signal_without_geo_success():
     """POST /api/signal with geo: null returns 200."""
     async with make_app_client() as client:
-        await _register(client, "sig-uuid-002", "Bob")
+        api_key = await _register(client, _UUID_2, "Bob")
         resp = await client.post(
             "/api/signal",
             json={
-                "user_id": "sig-uuid-002",
+                "user_id": _UUID_2,
                 "timestamp": 1742478000000,
                 "geo": None,
             },
+            headers={"Authorization": f"Bearer {api_key}"},
         )
     assert resp.status_code == 200
     assert resp.json()["status"] == "ok"
@@ -75,7 +94,7 @@ async def test_signal_missing_timestamp_returns_422():
     async with make_app_client() as client:
         resp = await client.post(
             "/api/signal",
-            json={"user_id": "sig-uuid-003"},
+            json={"user_id": _UUID_3},
         )
     assert resp.status_code == 422
 
@@ -87,14 +106,16 @@ async def test_signal_stored_in_db():
     proving both were persisted.
     """
     async with make_app_client() as client:
-        await _register(client, "sig-uuid-004", "Charlie")
+        api_key = await _register(client, _UUID_4, "Charlie")
         r1 = await client.post(
             "/api/signal",
-            json={"user_id": "sig-uuid-004", "timestamp": 1742478000001},
+            json={"user_id": _UUID_4, "timestamp": 1742478000001},
+            headers={"Authorization": f"Bearer {api_key}"},
         )
         r2 = await client.post(
             "/api/signal",
-            json={"user_id": "sig-uuid-004", "timestamp": 1742478000002},
+            json={"user_id": _UUID_4, "timestamp": 1742478000002},
+            headers={"Authorization": f"Bearer {api_key}"},
         )
     assert r1.status_code == 200
     assert r2.status_code == 200
@@ -111,11 +132,12 @@ async def test_signal_sends_telegram_message_directly():
     send_url = f"https://api.telegram.org/bot{_cfg.BOT_TOKEN}/sendMessage"
 
     async with make_app_client() as client:
-        await _register(client, "sig-uuid-005", "Dana")
+        api_key = await _register(client, _UUID_5, "Dana")
         # make_app_client already mocks send_url; signal returns 200 proves send was called
         resp = await client.post(
             "/api/signal",
-            json={"user_id": "sig-uuid-005", "timestamp": 1742478000000},
+            json={"user_id": _UUID_5, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {api_key}"},
         )
 
     assert resp.status_code == 200
@@ -126,10 +148,11 @@ async def test_signal_sends_telegram_message_directly():
 async def test_signal_returns_signal_id_positive():
     """signal_id in response is always a positive integer."""
     async with make_app_client() as client:
-        await _register(client, "sig-uuid-006", "Eve")
+        api_key = await _register(client, _UUID_6, "Eve")
         resp = await client.post(
             "/api/signal",
-            json={"user_id": "sig-uuid-006", "timestamp": 1742478000000},
+            json={"user_id": _UUID_6, "timestamp": 1742478000000},
+            headers={"Authorization": f"Bearer {api_key}"},
         )
     assert resp.json()["signal_id"] > 0
 
@@ -141,7 +164,7 @@ async def test_signal_geo_invalid_lat_returns_422():
         resp = await client.post(
             "/api/signal",
             json={
-                "user_id": "sig-uuid-007",
+                "user_id": _UUID_1,
                 "timestamp": 1742478000000,
                 "geo": {"lat": 200.0, "lon": 0.0, "accuracy": 10.0},
             },
diff --git a/tests/test_telegram.py b/tests/test_telegram.py
index 17ec801..c55a6a0 100644
--- a/tests/test_telegram.py
+++ b/tests/test_telegram.py
@@ -34,11 +34,57 @@ import pytest
 import respx
 
 from backend import config
-from backend.telegram import SignalAggregator, send_message, set_webhook
+from backend.telegram import SignalAggregator, send_message, set_webhook, validate_bot_token
 
 
 SEND_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
 WEBHOOK_URL_API = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"
+GET_ME_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/getMe"
+
+
+# ---------------------------------------------------------------------------
+# validate_bot_token
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_returns_true_on_200():
+    """validate_bot_token returns True when getMe responds 200."""
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(
+            return_value=httpx.Response(200, json={"ok": True, "result": {"username": "batonbot"}})
+        )
+        result = await validate_bot_token()
+    assert result is True
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_returns_false_on_401(caplog):
+    """validate_bot_token returns False and logs ERROR when getMe responds 401."""
+    import logging
+
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(
+            return_value=httpx.Response(401, json={"ok": False, "description": "Unauthorized"})
+        )
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            result = await validate_bot_token()
+
+    assert result is False
+    assert any("401" in record.message for record in caplog.records)
+
+
+@pytest.mark.asyncio
+async def test_validate_bot_token_returns_false_on_network_error(caplog):
+    """validate_bot_token returns False and logs ERROR on network failure — never raises."""
+    import logging
+
+    with respx.mock(assert_all_called=False) as mock:
+        mock.get(GET_ME_URL).mock(side_effect=httpx.ConnectError("connection refused"))
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            result = await validate_bot_token()
+
+    assert result is False
+    assert len(caplog.records) >= 1
 
 
 # ---------------------------------------------------------------------------
@@ -261,6 +307,71 @@ async def test_aggregator_buffer_cleared_after_flush():
         _cleanup(path)
 
 
+# ---------------------------------------------------------------------------
+# BATON-007: 400 "chat not found" handling
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_send_message_400_chat_not_found_does_not_raise():
+    """400 'chat not found' must not raise an exception (service stays alive)."""
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(
+            return_value=httpx.Response(
+                400,
+                json={"ok": False, "error_code": 400, "description": "Bad Request: chat not found"},
+            )
+        )
+        # Must not raise — service must stay alive even with wrong CHAT_ID
+        await send_message("test")
+
+
+@pytest.mark.asyncio
+async def test_send_message_400_chat_not_found_logs_error(caplog):
+    """400 response from Telegram must be logged as ERROR with the status code."""
+    import logging
+
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(
+            return_value=httpx.Response(
+                400,
+                json={"ok": False, "error_code": 400, "description": "Bad Request: chat not found"},
+            )
+        )
+        with caplog.at_level(logging.ERROR, logger="backend.telegram"):
+            await send_message("test chat not found")
+
+    assert any("400" in record.message for record in caplog.records), (
+        "Expected ERROR log containing '400' but got: " + str([r.message for r in caplog.records])
+    )
+
+
+@pytest.mark.asyncio
+async def test_send_message_400_breaks_after_first_attempt():
+    """On 400, send_message breaks immediately (no retry loop) — only one HTTP call made."""
+    with respx.mock(assert_all_called=False) as mock:
+        route = mock.post(SEND_URL).mock(
+            return_value=httpx.Response(
+                400,
+                json={"ok": False, "error_code": 400, "description": "Bad Request: chat not found"},
+            )
+        )
+        await send_message("test no retry on 400")
+
+    assert route.call_count == 1, f"Expected 1 call on 400, got {route.call_count}"
+
+
+@pytest.mark.asyncio
+async def test_send_message_all_5xx_retries_exhausted_does_not_raise():
+    """When all 3 attempts fail with 5xx, send_message logs error but does NOT raise."""
+    with respx.mock(assert_all_called=False) as mock:
+        mock.post(SEND_URL).mock(
+            return_value=httpx.Response(500, text="Internal Server Error")
+        )
+        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
+            # 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."""