fix: SELL 주문에서 Fat Finger 오탐 수정 — 손절/익절 차단 버그 (#187)

SELL 주문은 현금을 소비하지 않고 받는 것이므로 Fat Finger 체크 대상이
아님. 포지션 가치가 잔여 현금의 30%를 초과해도 SELL은 정상 실행돼야 함.

- realtime/daily 사이클 두 곳 모두 수정
- SELL: check_circuit_breaker만 호출 (Fat Finger 스킵)
- BUY: 기존대로 validate_order 호출 (Fat Finger + Circuit Breaker)
- 테스트 2개 추가: SELL Fat Finger 스킵, SELL 서킷브레이커 적용 확인

재현 사례 (2026-02-21):
  JELD stop-loss -6.20% → FAT FINGER: 49,548 is 99.1% of cash 50,000
  RXT take-profit +46.13% → FAT FINGER: 88,676 is 177.4% of cash 50,000

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/analysis/smart_scanner.py

@@ -175,7 +175,7 @@ class SmartVolatilityScanner:
                 liquidity_score = volume_rank_bonus.get(stock_code, 0.0)
                 score = min(100.0, volatility_score + liquidity_score)
                 signal = "momentum" if change_rate >= 0 else "oversold"
-                implied_rsi = max(0.0, min(100.0, 50.0 + (change_rate * 4.0)))
+                implied_rsi = max(0.0, min(100.0, 50.0 + (change_rate * 2.0)))
 
                 candidates.append(
                     ScanCandidate(
@@ -282,7 +282,7 @@ class SmartVolatilityScanner:
             liquidity_score = volume_rank_bonus.get(stock_code, 0.0)
             score = min(100.0, volatility_score + liquidity_score)
             signal = "momentum" if change_rate >= 0 else "oversold"
-            implied_rsi = max(0.0, min(100.0, 50.0 + (change_rate * 4.0)))
+            implied_rsi = max(0.0, min(100.0, 50.0 + (change_rate * 2.0)))
             candidates.append(
                 ScanCandidate(
                     stock_code=stock_code,
@@ -338,7 +338,7 @@ class SmartVolatilityScanner:
 
                 score = min(volatility_pct / 10.0, 1.0) * 100.0
                 signal = "momentum" if change_rate >= 0 else "oversold"
-                implied_rsi = max(0.0, min(100.0, 50.0 + (change_rate * 4.0)))
+                implied_rsi = max(0.0, min(100.0, 50.0 + (change_rate * 2.0)))
                 candidates.append(
                     ScanCandidate(
                         stock_code=stock_code,

src/main.py

@@ -81,6 +81,7 @@ def safe_float(value: str | float | None, default: float = 0.0) -> float:
 TRADE_INTERVAL_SECONDS = 60
 SCAN_INTERVAL_SECONDS = 60  # Scan markets every 60 seconds
 MAX_CONNECTION_RETRIES = 3
+_BUY_COOLDOWN_SECONDS = 600  # 10-minute cooldown after insufficient-balance rejection
 
 # Daily trading mode constants (for Free tier API efficiency)
 DAILY_TRADE_SESSIONS = 4  # Number of trading sessions per day
@@ -298,6 +299,7 @@ async def trading_cycle(
     stock_code: str,
     scan_candidates: dict[str, dict[str, ScanCandidate]],
     settings: Settings | None = None,
+    buy_cooldown: dict[str, float] | None = None,
 ) -> None:
     """Execute one trading cycle for a single stock."""
     cycle_start_time = asyncio.get_event_loop().time()
@@ -642,8 +644,28 @@ async def trading_cycle(
             return
         order_amount = current_price * quantity
 
-        # 4. Risk check BEFORE order
+        # 4. Check BUY cooldown (set when a prior BUY failed due to insufficient balance)
+        if decision.action == "BUY" and buy_cooldown is not None:
+            cooldown_key = f"{market.code}:{stock_code}"
+            cooldown_until = buy_cooldown.get(cooldown_key, 0.0)
+            now = asyncio.get_event_loop().time()
+            if now < cooldown_until:
+                remaining = int(cooldown_until - now)
+                logger.info(
+                    "Skip BUY %s (%s): insufficient-balance cooldown active (%ds remaining)",
+                    stock_code,
+                    market.name,
+                    remaining,
+                )
+                return
+
+        # 5a. Risk check BEFORE order
+        # SELL orders do not consume cash (they receive it), so fat-finger check
+        # is skipped for SELLs — only circuit breaker applies.
         try:
+            if decision.action == "SELL":
+                risk.check_circuit_breaker(pnl_pct)
+            else:
                 risk.validate_order(
                     current_pnl_pct=pnl_pct,
                     order_amount=order_amount,
@@ -690,11 +712,23 @@ async def trading_cycle(
             # Check if KIS rejected the order (rt_cd != "0")
             if result.get("rt_cd", "") != "0":
                 order_succeeded = False
+                msg1 = result.get("msg1") or ""
                 logger.warning(
                     "Overseas order not accepted for %s: rt_cd=%s msg=%s",
                     stock_code,
                     result.get("rt_cd"),
-                    result.get("msg1"),
+                    msg1,
+                )
+                # Set BUY cooldown when the rejection is due to insufficient balance
+                if decision.action == "BUY" and buy_cooldown is not None and "주문가능금액" in msg1:
+                    cooldown_key = f"{market.code}:{stock_code}"
+                    buy_cooldown[cooldown_key] = (
+                        asyncio.get_event_loop().time() + _BUY_COOLDOWN_SECONDS
+                    )
+                    logger.info(
+                        "BUY cooldown set for %s: %.0fs (insufficient balance)",
+                        stock_code,
+                        _BUY_COOLDOWN_SECONDS,
                     )
         logger.info("Order result: %s", result.get("msg1", "OK"))
 
@@ -803,6 +837,9 @@ async def run_daily_session(
 
     logger.info("Starting daily trading session for %d markets", len(open_markets))
 
+    # BUY cooldown: prevents retrying stocks rejected for insufficient balance
+    daily_buy_cooldown: dict[str, float] = {}  # "{market_code}:{stock_code}" -> expiry timestamp
+
     # Process each open market
     for market in open_markets:
         # Use market-local date for playbook keying
@@ -1075,8 +1112,28 @@ async def run_daily_session(
                     continue
                 order_amount = stock_data["current_price"] * quantity
 
+                # Check BUY cooldown (insufficient balance)
+                if decision.action == "BUY":
+                    daily_cooldown_key = f"{market.code}:{stock_code}"
+                    daily_cooldown_until = daily_buy_cooldown.get(daily_cooldown_key, 0.0)
+                    now = asyncio.get_event_loop().time()
+                    if now < daily_cooldown_until:
+                        remaining = int(daily_cooldown_until - now)
+                        logger.info(
+                            "Skip BUY %s (%s): insufficient-balance cooldown active (%ds remaining)",
+                            stock_code,
+                            market.name,
+                            remaining,
+                        )
+                        continue
+
                 # Risk check
+                # SELL orders do not consume cash (they receive it), so fat-finger
+                # check is skipped for SELLs — only circuit breaker applies.
                 try:
+                    if decision.action == "SELL":
+                        risk.check_circuit_breaker(pnl_pct)
+                    else:
                         risk.validate_order(
                             current_pnl_pct=pnl_pct,
                             order_amount=order_amount,
@@ -1131,11 +1188,22 @@ async def run_daily_session(
                         )
                         if result.get("rt_cd", "") != "0":
                             order_succeeded = False
+                            daily_msg1 = result.get("msg1") or ""
                             logger.warning(
                                 "Overseas order not accepted for %s: rt_cd=%s msg=%s",
                                 stock_code,
                                 result.get("rt_cd"),
-                                result.get("msg1"),
+                                daily_msg1,
+                            )
+                            if decision.action == "BUY" and "주문가능금액" in daily_msg1:
+                                daily_cooldown_key = f"{market.code}:{stock_code}"
+                                daily_buy_cooldown[daily_cooldown_key] = (
+                                    asyncio.get_event_loop().time() + _BUY_COOLDOWN_SECONDS
+                                )
+                                logger.info(
+                                    "BUY cooldown set for %s: %.0fs (insufficient balance)",
+                                    stock_code,
+                                    _BUY_COOLDOWN_SECONDS,
                                 )
                     logger.info("Order result: %s", result.get("msg1", "OK"))
 
@@ -1763,6 +1831,9 @@ async def run(settings: Settings) -> None:
     # Active stocks per market (dynamically discovered by scanner)
     active_stocks: dict[str, list[str]] = {}  # market_code -> [stock_codes]
 
+    # BUY cooldown: prevents retrying a stock rejected for insufficient balance
+    buy_cooldown: dict[str, float] = {}  # "{market_code}:{stock_code}" -> expiry timestamp
+
     # Initialize latency control system
     criticality_assessor = CriticalityAssessor(
         critical_pnl_threshold=-2.5,  # Near circuit breaker at -3.0%
@@ -2105,6 +2176,7 @@ async def run(settings: Settings) -> None:
                                     stock_code,
                                     scan_candidates,
                                     settings,
+                                    buy_cooldown,
                                 )
                                 break  # Success — exit retry loop
                             except CircuitBreakerTripped as exc:

src/notifications/telegram_client.py

@@ -604,6 +604,16 @@ class TelegramCommandHandler:
             async with session.post(url, json=payload) as resp:
                 if resp.status != 200:
                     error_text = await resp.text()
+                    if resp.status == 409:
+                        # Another bot instance is already polling — stop this poller entirely.
+                        # Retrying would keep conflicting with the other instance.
+                        self._running = False
+                        logger.warning(
+                            "Telegram conflict (409): another instance is already polling. "
+                            "Disabling Telegram commands for this process. "
+                            "Ensure only one instance of The Ouroboros is running at a time.",
+                        )
+                    else:
                         logger.error(
                             "getUpdates API error (status=%d): %s", resp.status, error_text
                         )

tests/test_main.py

@@ -631,6 +631,119 @@ class TestTradingCycleTelegramIntegration:
         # Verify no trade notification sent
         mock_telegram.notify_trade_execution.assert_not_called()
 
+    @pytest.mark.asyncio
+    async def test_sell_skips_fat_finger_check(
+        self,
+        mock_broker: MagicMock,
+        mock_overseas_broker: MagicMock,
+        mock_scenario_engine: MagicMock,
+        mock_playbook: DayPlaybook,
+        mock_risk: MagicMock,
+        mock_db: MagicMock,
+        mock_decision_logger: MagicMock,
+        mock_context_store: MagicMock,
+        mock_criticality_assessor: MagicMock,
+        mock_telegram: MagicMock,
+        mock_market: MagicMock,
+    ) -> None:
+        """SELL orders must not be blocked by fat-finger check.
+
+        Even if position value > 30% of cash (e.g. stop-loss on a large holding
+        with low remaining cash), the SELL should proceed — only circuit breaker
+        applies to SELLs.
+        """
+        # SELL decision with held qty=100 shares @ 50,000 = 5,000,000
+        # cash = 5,000,000 → ratio = 100% which would normally trigger fat finger
+        mock_scenario_engine.evaluate = MagicMock(return_value=_make_sell_match())
+        mock_broker.get_balance = AsyncMock(
+            return_value={
+                "output1": [{"pdno": "005930", "ord_psbl_qty": "100"}],
+                "output2": [
+                    {
+                        "tot_evlu_amt": "10000000",
+                        "dnca_tot_amt": "5000000",
+                        "pchs_amt_smtl_amt": "5000000",
+                    }
+                ],
+            }
+        )
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=mock_broker,
+                overseas_broker=mock_overseas_broker,
+                scenario_engine=mock_scenario_engine,
+                playbook=mock_playbook,
+                risk=mock_risk,
+                db_conn=mock_db,
+                decision_logger=mock_decision_logger,
+                context_store=mock_context_store,
+                criticality_assessor=mock_criticality_assessor,
+                telegram=mock_telegram,
+                market=mock_market,
+                stock_code="005930",
+                scan_candidates={},
+            )
+
+        # validate_order (which includes fat finger) must NOT be called for SELL
+        mock_risk.validate_order.assert_not_called()
+        # check_circuit_breaker MUST be called for SELL
+        mock_risk.check_circuit_breaker.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_sell_circuit_breaker_still_applies(
+        self,
+        mock_broker: MagicMock,
+        mock_overseas_broker: MagicMock,
+        mock_scenario_engine: MagicMock,
+        mock_playbook: DayPlaybook,
+        mock_risk: MagicMock,
+        mock_db: MagicMock,
+        mock_decision_logger: MagicMock,
+        mock_context_store: MagicMock,
+        mock_criticality_assessor: MagicMock,
+        mock_telegram: MagicMock,
+        mock_market: MagicMock,
+    ) -> None:
+        """SELL orders must still respect the circuit breaker."""
+        mock_scenario_engine.evaluate = MagicMock(return_value=_make_sell_match())
+        mock_broker.get_balance = AsyncMock(
+            return_value={
+                "output1": [{"pdno": "005930", "ord_psbl_qty": "100"}],
+                "output2": [
+                    {
+                        "tot_evlu_amt": "10000000",
+                        "dnca_tot_amt": "5000000",
+                        "pchs_amt_smtl_amt": "5000000",
+                    }
+                ],
+            }
+        )
+        mock_risk.check_circuit_breaker.side_effect = CircuitBreakerTripped(
+            pnl_pct=-4.0, threshold=-3.0
+        )
+
+        with patch("src.main.log_trade"):
+            with pytest.raises(CircuitBreakerTripped):
+                await trading_cycle(
+                    broker=mock_broker,
+                    overseas_broker=mock_overseas_broker,
+                    scenario_engine=mock_scenario_engine,
+                    playbook=mock_playbook,
+                    risk=mock_risk,
+                    db_conn=mock_db,
+                    decision_logger=mock_decision_logger,
+                    context_store=mock_context_store,
+                    criticality_assessor=mock_criticality_assessor,
+                    telegram=mock_telegram,
+                    market=mock_market,
+                    stock_code="005930",
+                    scan_candidates={},
+                )
+
+        mock_risk.check_circuit_breaker.assert_called_once()
+        mock_risk.validate_order.assert_not_called()
+
 
 class TestRunFunctionTelegramIntegration:
     """Test telegram notifications in run function."""
@@ -2217,6 +2330,245 @@ def test_start_dashboard_server_returns_none_when_uvicorn_missing() -> None:
     assert thread is None
 
 
+# ---------------------------------------------------------------------------
+# BUY cooldown tests (#179)
+# ---------------------------------------------------------------------------
+
+
+class TestBuyCooldown:
+    """Tests for BUY cooldown after insufficient-balance rejection."""
+
+    @pytest.fixture
+    def mock_broker(self) -> MagicMock:
+        broker = MagicMock()
+        broker.get_current_price = AsyncMock(return_value=(100.0, 1.0, 0.0))
+        broker.get_balance = AsyncMock(
+            return_value={
+                "output2": [{"tot_evlu_amt": "1000000", "dnca_tot_amt": "500000",
+                             "pchs_amt_smtl_amt": "500000"}]
+            }
+        )
+        broker.send_order = AsyncMock(return_value={"msg1": "OK"})
+        return broker
+
+    @pytest.fixture
+    def mock_market(self) -> MagicMock:
+        market = MagicMock()
+        market.name = "Korea"
+        market.code = "KR"
+        market.exchange_code = "KRX"
+        market.is_domestic = True
+        return market
+
+    @pytest.fixture
+    def mock_overseas_market(self) -> MagicMock:
+        market = MagicMock()
+        market.name = "NASDAQ"
+        market.code = "US_NASDAQ"
+        market.exchange_code = "NAS"
+        market.is_domestic = False
+        return market
+
+    @pytest.fixture
+    def mock_overseas_broker(self) -> MagicMock:
+        broker = MagicMock()
+        broker.get_overseas_price = AsyncMock(
+            return_value={"output": {"last": "1.0", "rate": "0.0",
+                                     "high": "1.05", "low": "0.95", "tvol": "1000000"}}
+        )
+        broker.get_overseas_balance = AsyncMock(return_value={
+            "output1": [],
+            "output2": [{"frcr_dncl_amt_2": "50000", "frcr_evlu_tota": "50000",
+                         "frcr_buy_amt_smtl": "0"}],
+        })
+        broker.send_overseas_order = AsyncMock(
+            return_value={"rt_cd": "1", "msg1": "모의투자 주문가능금액이 부족합니다."}
+        )
+        return broker
+
+    def _make_buy_match_overseas(self, stock_code: str = "MLECW") -> ScenarioMatch:
+        return ScenarioMatch(
+            stock_code=stock_code,
+            matched_scenario=None,
+            action=ScenarioAction.BUY,
+            confidence=85,
+            rationale="Test buy",
+        )
+
+    @pytest.mark.asyncio
+    async def test_cooldown_set_on_insufficient_balance(
+        self, mock_broker: MagicMock, mock_overseas_broker: MagicMock,
+        mock_overseas_market: MagicMock,
+    ) -> None:
+        """BUY cooldown entry is created after 주문가능금액 rejection."""
+        engine = MagicMock(spec=ScenarioEngine)
+        engine.evaluate = MagicMock(return_value=self._make_buy_match_overseas("MLECW"))
+        buy_cooldown: dict[str, float] = {}
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=mock_broker,
+                overseas_broker=mock_overseas_broker,
+                scenario_engine=engine,
+                playbook=_make_playbook("US_NASDAQ"),
+                risk=MagicMock(),
+                db_conn=MagicMock(),
+                decision_logger=MagicMock(),
+                context_store=MagicMock(get_latest_timeframe=MagicMock(return_value=None)),
+                criticality_assessor=MagicMock(
+                    assess_market_conditions=MagicMock(return_value=MagicMock(value="NORMAL")),
+                    get_timeout=MagicMock(return_value=5.0),
+                ),
+                telegram=MagicMock(
+                    notify_trade_execution=AsyncMock(),
+                    notify_fat_finger=AsyncMock(),
+                    notify_circuit_breaker=AsyncMock(),
+                    notify_scenario_matched=AsyncMock(),
+                ),
+                market=mock_overseas_market,
+                stock_code="MLECW",
+                scan_candidates={},
+                buy_cooldown=buy_cooldown,
+            )
+
+        assert "US_NASDAQ:MLECW" in buy_cooldown
+        assert buy_cooldown["US_NASDAQ:MLECW"] > 0
+
+    @pytest.mark.asyncio
+    async def test_cooldown_skips_buy(
+        self, mock_broker: MagicMock, mock_overseas_broker: MagicMock,
+        mock_overseas_market: MagicMock,
+    ) -> None:
+        """BUY is skipped when cooldown is active for the stock."""
+        engine = MagicMock(spec=ScenarioEngine)
+        engine.evaluate = MagicMock(return_value=self._make_buy_match_overseas("MLECW"))
+
+        import asyncio
+        # Set an active cooldown (expires far in the future)
+        buy_cooldown: dict[str, float] = {
+            "US_NASDAQ:MLECW": asyncio.get_event_loop().time() + 600
+        }
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=mock_broker,
+                overseas_broker=mock_overseas_broker,
+                scenario_engine=engine,
+                playbook=_make_playbook("US_NASDAQ"),
+                risk=MagicMock(),
+                db_conn=MagicMock(),
+                decision_logger=MagicMock(),
+                context_store=MagicMock(get_latest_timeframe=MagicMock(return_value=None)),
+                criticality_assessor=MagicMock(
+                    assess_market_conditions=MagicMock(return_value=MagicMock(value="NORMAL")),
+                    get_timeout=MagicMock(return_value=5.0),
+                ),
+                telegram=MagicMock(
+                    notify_trade_execution=AsyncMock(),
+                    notify_fat_finger=AsyncMock(),
+                    notify_circuit_breaker=AsyncMock(),
+                    notify_scenario_matched=AsyncMock(),
+                ),
+                market=mock_overseas_market,
+                stock_code="MLECW",
+                scan_candidates={},
+                buy_cooldown=buy_cooldown,
+            )
+
+        # Order should NOT have been sent
+        mock_overseas_broker.send_overseas_order.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_cooldown_not_set_on_other_errors(
+        self, mock_broker: MagicMock, mock_overseas_market: MagicMock,
+    ) -> None:
+        """Cooldown is NOT set for non-balance-related rejections."""
+        engine = MagicMock(spec=ScenarioEngine)
+        engine.evaluate = MagicMock(return_value=self._make_buy_match_overseas("MLECW"))
+        # Different rejection reason
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_price = AsyncMock(
+            return_value={"output": {"last": "1.0", "rate": "0.0",
+                                     "high": "1.05", "low": "0.95", "tvol": "1000000"}}
+        )
+        overseas_broker.get_overseas_balance = AsyncMock(return_value={
+            "output1": [],
+            "output2": [{"frcr_dncl_amt_2": "50000", "frcr_evlu_tota": "50000",
+                         "frcr_buy_amt_smtl": "0"}],
+        })
+        overseas_broker.send_overseas_order = AsyncMock(
+            return_value={"rt_cd": "1", "msg1": "기타 오류 메시지"}
+        )
+        buy_cooldown: dict[str, float] = {}
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=mock_broker,
+                overseas_broker=overseas_broker,
+                scenario_engine=engine,
+                playbook=_make_playbook("US_NASDAQ"),
+                risk=MagicMock(),
+                db_conn=MagicMock(),
+                decision_logger=MagicMock(),
+                context_store=MagicMock(get_latest_timeframe=MagicMock(return_value=None)),
+                criticality_assessor=MagicMock(
+                    assess_market_conditions=MagicMock(return_value=MagicMock(value="NORMAL")),
+                    get_timeout=MagicMock(return_value=5.0),
+                ),
+                telegram=MagicMock(
+                    notify_trade_execution=AsyncMock(),
+                    notify_fat_finger=AsyncMock(),
+                    notify_circuit_breaker=AsyncMock(),
+                    notify_scenario_matched=AsyncMock(),
+                ),
+                market=mock_overseas_market,
+                stock_code="MLECW",
+                scan_candidates={},
+                buy_cooldown=buy_cooldown,
+            )
+
+        # Cooldown should NOT be set for non-balance errors
+        assert "US_NASDAQ:MLECW" not in buy_cooldown
+
+    @pytest.mark.asyncio
+    async def test_no_cooldown_param_still_works(
+        self, mock_broker: MagicMock, mock_overseas_broker: MagicMock,
+        mock_overseas_market: MagicMock,
+    ) -> None:
+        """trading_cycle works normally when buy_cooldown is None (default)."""
+        engine = MagicMock(spec=ScenarioEngine)
+        engine.evaluate = MagicMock(return_value=self._make_buy_match_overseas("MLECW"))
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=mock_broker,
+                overseas_broker=mock_overseas_broker,
+                scenario_engine=engine,
+                playbook=_make_playbook("US_NASDAQ"),
+                risk=MagicMock(),
+                db_conn=MagicMock(),
+                decision_logger=MagicMock(),
+                context_store=MagicMock(get_latest_timeframe=MagicMock(return_value=None)),
+                criticality_assessor=MagicMock(
+                    assess_market_conditions=MagicMock(return_value=MagicMock(value="NORMAL")),
+                    get_timeout=MagicMock(return_value=5.0),
+                ),
+                telegram=MagicMock(
+                    notify_trade_execution=AsyncMock(),
+                    notify_fat_finger=AsyncMock(),
+                    notify_circuit_breaker=AsyncMock(),
+                    notify_scenario_matched=AsyncMock(),
+                ),
+                market=mock_overseas_market,
+                stock_code="MLECW",
+                scan_candidates={},
+                # buy_cooldown not passed → defaults to None
+            )
+
+        # Should attempt the order (and fail), but not crash
+        mock_overseas_broker.send_overseas_order.assert_called_once()
+
+
 # ---------------------------------------------------------------------------
 # market_outlook BUY confidence threshold tests (#173)
 # ---------------------------------------------------------------------------

tests/test_smart_scanner.py

@@ -350,6 +350,42 @@ class TestSmartVolatilityScanner:
         assert [c.stock_code for c in candidates] == ["ABCD"]
 
 
+class TestImpliedRSIFormula:
+    """Test the implied_rsi formula in SmartVolatilityScanner (issue #181)."""
+
+    def test_neutral_change_gives_neutral_rsi(self) -> None:
+        """0% change → implied_rsi = 50 (neutral)."""
+        # formula: 50 + (change_rate * 2.0)
+        rsi = max(0.0, min(100.0, 50.0 + (0.0 * 2.0)))
+        assert rsi == 50.0
+
+    def test_10pct_change_gives_rsi_70(self) -> None:
+        """10% upward change → implied_rsi = 70 (momentum signal)."""
+        rsi = max(0.0, min(100.0, 50.0 + (10.0 * 2.0)))
+        assert rsi == 70.0
+
+    def test_minus_10pct_gives_rsi_30(self) -> None:
+        """-10% change → implied_rsi = 30 (oversold signal)."""
+        rsi = max(0.0, min(100.0, 50.0 + (-10.0 * 2.0)))
+        assert rsi == 30.0
+
+    def test_saturation_at_25pct(self) -> None:
+        """Saturation occurs at >=25% change (not 12.5% as with old coefficient 4.0)."""
+        rsi_12pct = max(0.0, min(100.0, 50.0 + (12.5 * 2.0)))
+        rsi_25pct = max(0.0, min(100.0, 50.0 + (25.0 * 2.0)))
+        rsi_30pct = max(0.0, min(100.0, 50.0 + (30.0 * 2.0)))
+        # At 12.5% change: RSI = 75 (not 100, unlike old formula)
+        assert rsi_12pct == 75.0
+        # At 25%+ saturation
+        assert rsi_25pct == 100.0
+        assert rsi_30pct == 100.0  # Capped
+
+    def test_negative_saturation(self) -> None:
+        """Saturation at -25% gives RSI = 0."""
+        rsi = max(0.0, min(100.0, 50.0 + (-25.0 * 2.0)))
+        assert rsi == 0.0
+
+
 class TestRSICalculation:
     """Test RSI calculation in VolatilityAnalyzer."""
 

tests/test_telegram_commands.py

@@ -876,6 +876,54 @@ class TestGetUpdates:
 
             assert updates == []
 
+    @pytest.mark.asyncio
+    async def test_get_updates_409_stops_polling(self) -> None:
+        """409 Conflict response stops the poller (_running = False) and returns empty list."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+        handler._running = True  # simulate active poller
+
+        mock_resp = AsyncMock()
+        mock_resp.status = 409
+        mock_resp.text = AsyncMock(
+            return_value='{"ok":false,"error_code":409,"description":"Conflict"}'
+        )
+        mock_resp.__aenter__ = AsyncMock(return_value=mock_resp)
+        mock_resp.__aexit__ = AsyncMock(return_value=False)
+
+        with patch("aiohttp.ClientSession.post", return_value=mock_resp):
+            updates = await handler._get_updates()
+
+        assert updates == []
+        assert handler._running is False  # poller stopped
+
+    @pytest.mark.asyncio
+    async def test_poll_loop_exits_after_409(self) -> None:
+        """_poll_loop exits naturally after _running is set to False by a 409 response."""
+        import asyncio as _asyncio
+
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        call_count = 0
+
+        async def mock_get_updates_409() -> list[dict]:
+            nonlocal call_count
+            call_count += 1
+            # Simulate 409 stopping the poller
+            handler._running = False
+            return []
+
+        handler._get_updates = mock_get_updates_409  # type: ignore[method-assign]
+
+        handler._running = True
+        task = _asyncio.create_task(handler._poll_loop())
+        await _asyncio.wait_for(task, timeout=2.0)
+
+        # _get_updates called exactly once, then loop exited
+        assert call_count == 1
+        assert handler._running is False
+
 
 class TestCommandWithArgs:
     """Test register_command_with_args and argument dispatch."""