style: auto-fix lint violations from enhanced ruff rules

16 files changed, 60 insertions, 64 deletions

diff --git a/services/strategy-engine/tests/test_base_filters.py b/services/strategy-engine/tests/test_base_filters.py
index ae9ca05..66adec7 100644
--- a/services/strategy-engine/tests/test_base_filters.py
+++ b/services/strategy-engine/tests/test_base_filters.py
@@ -5,12 +5,13 @@ from pathlib import Path
 
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
+from datetime import UTC, datetime
 from decimal import Decimal
-from datetime import datetime, timezone
 
-from shared.models import Candle, Signal, OrderSide
 from strategies.base import BaseStrategy
 
+from shared.models import Candle, OrderSide, Signal
+
 
 class DummyStrategy(BaseStrategy):
     name = "dummy"
@@ -45,7 +46,7 @@ def _candle(price=100.0, volume=10.0, high=None, low=None):
     return Candle(
         symbol="AAPL",
         timeframe="1h",
-        open_time=datetime(2025, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2025, 1, 1, tzinfo=UTC),
         open=Decimal(str(price)),
         high=Decimal(str(h)),
         low=Decimal(str(lo)),
diff --git a/services/strategy-engine/tests/test_bollinger_strategy.py b/services/strategy-engine/tests/test_bollinger_strategy.py
index 8261377..70ec66e 100644
--- a/services/strategy-engine/tests/test_bollinger_strategy.py
+++ b/services/strategy-engine/tests/test_bollinger_strategy.py
@@ -1,18 +1,18 @@
 """Tests for the Bollinger Bands strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.bollinger_strategy import BollingerStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.bollinger_strategy import BollingerStrategy
 
 
 def make_candle(close: float) -> Candle:
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal(str(close)),
         high=Decimal(str(close)),
         low=Decimal(str(close)),
diff --git a/services/strategy-engine/tests/test_combined_strategy.py b/services/strategy-engine/tests/test_combined_strategy.py
index 8a4dc74..6a15250 100644
--- a/services/strategy-engine/tests/test_combined_strategy.py
+++ b/services/strategy-engine/tests/test_combined_strategy.py
@@ -5,13 +5,14 @@ from pathlib import Path
 
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
+from datetime import UTC, datetime
 from decimal import Decimal
-from datetime import datetime, timezone
-import pytest
 
-from shared.models import Candle, Signal, OrderSide
-from strategies.combined_strategy import CombinedStrategy
+import pytest
 from strategies.base import BaseStrategy
+from strategies.combined_strategy import CombinedStrategy
+
+from shared.models import Candle, OrderSide, Signal
 
 
 class AlwaysBuyStrategy(BaseStrategy):
@@ -74,7 +75,7 @@ def _candle(price=100.0):
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2025, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2025, 1, 1, tzinfo=UTC),
         open=Decimal(str(price)),
         high=Decimal(str(price + 10)),
         low=Decimal(str(price - 10)),
diff --git a/services/strategy-engine/tests/test_ema_crossover_strategy.py b/services/strategy-engine/tests/test_ema_crossover_strategy.py
index 7028eb0..af2b587 100644
--- a/services/strategy-engine/tests/test_ema_crossover_strategy.py
+++ b/services/strategy-engine/tests/test_ema_crossover_strategy.py
@@ -1,18 +1,18 @@
 """Tests for the EMA Crossover strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.ema_crossover_strategy import EmaCrossoverStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.ema_crossover_strategy import EmaCrossoverStrategy
 
 
 def make_candle(close: float) -> Candle:
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal(str(close)),
         high=Decimal(str(close)),
         low=Decimal(str(close)),
diff --git a/services/strategy-engine/tests/test_engine.py b/services/strategy-engine/tests/test_engine.py
index 2623027..fa888b5 100644
--- a/services/strategy-engine/tests/test_engine.py
+++ b/services/strategy-engine/tests/test_engine.py
@@ -1,21 +1,21 @@
 """Tests for the StrategyEngine."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 from unittest.mock import AsyncMock, MagicMock
 
 import pytest
+from strategy_engine.engine import StrategyEngine
 
-from shared.models import Candle, Signal, OrderSide
 from shared.events import CandleEvent
-from strategy_engine.engine import StrategyEngine
+from shared.models import Candle, OrderSide, Signal
 
 
 def make_candle_event() -> dict:
     candle = Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal("50000"),
         high=Decimal("50100"),
         low=Decimal("49900"),
diff --git a/services/strategy-engine/tests/test_grid_strategy.py b/services/strategy-engine/tests/test_grid_strategy.py
index 878b900..f697012 100644
--- a/services/strategy-engine/tests/test_grid_strategy.py
+++ b/services/strategy-engine/tests/test_grid_strategy.py
@@ -1,18 +1,18 @@
 """Tests for the Grid strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.grid_strategy import GridStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.grid_strategy import GridStrategy
 
 
 def make_candle(close: float) -> Candle:
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal(str(close)),
         high=Decimal(str(close)),
         low=Decimal(str(close)),
diff --git a/services/strategy-engine/tests/test_indicators.py b/services/strategy-engine/tests/test_indicators.py
index 481569b..3147fc4 100644
--- a/services/strategy-engine/tests/test_indicators.py
+++ b/services/strategy-engine/tests/test_indicators.py
@@ -5,14 +5,13 @@ from pathlib import Path
 
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
-import pandas as pd
 import numpy as np
+import pandas as pd
 import pytest
-
-from strategies.indicators.trend import sma, ema, macd, adx
-from strategies.indicators.volatility import atr, bollinger_bands
 from strategies.indicators.momentum import rsi, stochastic
-from strategies.indicators.volume import volume_sma, volume_ratio, obv
+from strategies.indicators.trend import adx, ema, macd, sma
+from strategies.indicators.volatility import atr, bollinger_bands
+from strategies.indicators.volume import obv, volume_ratio, volume_sma
 
 
 class TestTrend:
diff --git a/services/strategy-engine/tests/test_macd_strategy.py b/services/strategy-engine/tests/test_macd_strategy.py
index 556fd4c..7fac16f 100644
--- a/services/strategy-engine/tests/test_macd_strategy.py
+++ b/services/strategy-engine/tests/test_macd_strategy.py
@@ -1,18 +1,18 @@
 """Tests for the MACD strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.macd_strategy import MacdStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.macd_strategy import MacdStrategy
 
 
 def _candle(price: float) -> Candle:
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal(str(price)),
         high=Decimal(str(price)),
         low=Decimal(str(price)),
diff --git a/services/strategy-engine/tests/test_moc_strategy.py b/services/strategy-engine/tests/test_moc_strategy.py
index 1928a28..076e846 100644
--- a/services/strategy-engine/tests/test_moc_strategy.py
+++ b/services/strategy-engine/tests/test_moc_strategy.py
@@ -5,19 +5,20 @@ from pathlib import Path
 
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
-from shared.models import Candle, OrderSide
 from strategies.moc_strategy import MocStrategy
 
+from shared.models import Candle, OrderSide
+
 
 def _candle(price, hour=20, minute=0, volume=100.0, day=1, open_price=None):
     op = open_price if open_price is not None else price - 1  # Default: bullish
     return Candle(
         symbol="AAPL",
         timeframe="5Min",
-        open_time=datetime(2025, 1, day, hour, minute, tzinfo=timezone.utc),
+        open_time=datetime(2025, 1, day, hour, minute, tzinfo=UTC),
         open=Decimal(str(op)),
         high=Decimal(str(price + 1)),
         low=Decimal(str(min(op, price) - 1)),
diff --git a/services/strategy-engine/tests/test_multi_symbol.py b/services/strategy-engine/tests/test_multi_symbol.py
index 671a9d3..922bfc2 100644
--- a/services/strategy-engine/tests/test_multi_symbol.py
+++ b/services/strategy-engine/tests/test_multi_symbol.py
@@ -9,11 +9,13 @@ import pytest
 sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "src"))
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
+from datetime import UTC, datetime
+from decimal import Decimal
+
 from strategy_engine.engine import StrategyEngine
+
 from shared.events import CandleEvent
 from shared.models import Candle
-from decimal import Decimal
-from datetime import datetime, timezone
 
 
 @pytest.mark.asyncio
@@ -24,7 +26,7 @@ async def test_engine_processes_multiple_streams():
     candle_btc = Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2025, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2025, 1, 1, tzinfo=UTC),
         open=Decimal("50000"),
         high=Decimal("51000"),
         low=Decimal("49000"),
@@ -34,7 +36,7 @@ async def test_engine_processes_multiple_streams():
     candle_eth = Candle(
         symbol="MSFT",
         timeframe="1m",
-        open_time=datetime(2025, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2025, 1, 1, tzinfo=UTC),
         open=Decimal("3000"),
         high=Decimal("3100"),
         low=Decimal("2900"),
diff --git a/services/strategy-engine/tests/test_plugin_loader.py b/services/strategy-engine/tests/test_plugin_loader.py
index 5191fc3..7bd450f 100644
--- a/services/strategy-engine/tests/test_plugin_loader.py
+++ b/services/strategy-engine/tests/test_plugin_loader.py
@@ -2,10 +2,8 @@
 
 from pathlib import Path
 
-
 from strategy_engine.plugin_loader import load_strategies
 
-
 STRATEGIES_DIR = Path(__file__).parent.parent / "strategies"
 
 
diff --git a/services/strategy-engine/tests/test_rsi_strategy.py b/services/strategy-engine/tests/test_rsi_strategy.py
index 6d31fd5..6c74f0b 100644
--- a/services/strategy-engine/tests/test_rsi_strategy.py
+++ b/services/strategy-engine/tests/test_rsi_strategy.py
@@ -1,18 +1,18 @@
 """Tests for the RSI strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.rsi_strategy import RsiStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.rsi_strategy import RsiStrategy
 
 
 def make_candle(close: float, idx: int = 0) -> Candle:
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal(str(close)),
         high=Decimal(str(close)),
         low=Decimal(str(close)),
diff --git a/services/strategy-engine/tests/test_stock_selector.py b/services/strategy-engine/tests/test_stock_selector.py
index fa15f66..76b8541 100644
--- a/services/strategy-engine/tests/test_stock_selector.py
+++ b/services/strategy-engine/tests/test_stock_selector.py
@@ -1,8 +1,7 @@
 """Tests for stock selector engine."""
 
+from datetime import UTC, datetime
 from unittest.mock import AsyncMock, MagicMock
-from datetime import datetime, timezone
-
 
 from strategy_engine.stock_selector import (
     SentimentCandidateSource,
@@ -101,7 +100,7 @@ async def test_selector_blocks_on_risk_off():
             "vix": 35.0,
             "fed_stance": "neutral",
             "market_regime": "risk_off",
-            "updated_at": datetime.now(timezone.utc),
+            "updated_at": datetime.now(UTC),
         }
     )
 
diff --git a/services/strategy-engine/tests/test_strategy_validation.py b/services/strategy-engine/tests/test_strategy_validation.py
index debab1f..0d9607a 100644
--- a/services/strategy-engine/tests/test_strategy_validation.py
+++ b/services/strategy-engine/tests/test_strategy_validation.py
@@ -1,13 +1,11 @@
 import pytest
-
-from strategies.rsi_strategy import RsiStrategy
-from strategies.macd_strategy import MacdStrategy
 from strategies.bollinger_strategy import BollingerStrategy
 from strategies.ema_crossover_strategy import EmaCrossoverStrategy
 from strategies.grid_strategy import GridStrategy
-from strategies.vwap_strategy import VwapStrategy
+from strategies.macd_strategy import MacdStrategy
+from strategies.rsi_strategy import RsiStrategy
 from strategies.volume_profile_strategy import VolumeProfileStrategy
-
+from strategies.vwap_strategy import VwapStrategy
 
 # ── RSI ──────────────────────────────────────────────────────────────────
 
diff --git a/services/strategy-engine/tests/test_volume_profile_strategy.py b/services/strategy-engine/tests/test_volume_profile_strategy.py
index 65ee2e8..f47898c 100644
--- a/services/strategy-engine/tests/test_volume_profile_strategy.py
+++ b/services/strategy-engine/tests/test_volume_profile_strategy.py
@@ -1,18 +1,18 @@
 """Tests for the Volume Profile strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.volume_profile_strategy import VolumeProfileStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.volume_profile_strategy import VolumeProfileStrategy
 
 
 def make_candle(close: float, volume: float = 1.0) -> Candle:
     return Candle(
         symbol="AAPL",
         timeframe="1m",
-        open_time=datetime(2024, 1, 1, tzinfo=timezone.utc),
+        open_time=datetime(2024, 1, 1, tzinfo=UTC),
         open=Decimal(str(close)),
         high=Decimal(str(close)),
         low=Decimal(str(close)),
@@ -134,13 +134,10 @@ def test_volume_profile_hvn_detection():
 
     # Create a profile with very high volume at price ~100 and low volume elsewhere
     # Prices range from 90 to 110, heavy volume concentrated at 100
-    candles_data = []
     # Low volume at extremes
-    for p in [90, 91, 92, 109, 110]:
-        candles_data.append((p, 1.0))
+    candles_data = [(p, 1.0) for p in [90, 91, 92, 109, 110]]
     # Very high volume around 100
-    for _ in range(15):
-        candles_data.append((100, 100.0))
+    candles_data.extend((100, 100.0) for _ in range(15))
 
     for price, vol in candles_data:
         strategy.on_candle(make_candle(price, vol))
@@ -148,7 +145,7 @@ def test_volume_profile_hvn_detection():
     # Access the internal method to verify HVN detection
     result = strategy._compute_value_area()
     assert result is not None
-    poc, va_low, va_high, hvn_levels, lvn_levels = result
+    _poc, _va_low, _va_high, hvn_levels, _lvn_levels = result
 
     # The bin containing price ~100 should have very high volume -> HVN
     assert len(hvn_levels) > 0
diff --git a/services/strategy-engine/tests/test_vwap_strategy.py b/services/strategy-engine/tests/test_vwap_strategy.py
index 2c34b01..078d0cf 100644
--- a/services/strategy-engine/tests/test_vwap_strategy.py
+++ b/services/strategy-engine/tests/test_vwap_strategy.py
@@ -1,11 +1,11 @@
 """Tests for the VWAP strategy."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from decimal import Decimal
 
+from strategies.vwap_strategy import VwapStrategy
 
 from shared.models import Candle, OrderSide
-from strategies.vwap_strategy import VwapStrategy
 
 
 def make_candle(
@@ -20,7 +20,7 @@ def make_candle(
     if low is None:
         low = close
     if open_time is None:
-        open_time = datetime(2024, 1, 1, tzinfo=timezone.utc)
+        open_time = datetime(2024, 1, 1, tzinfo=UTC)
     return Candle(
         symbol="AAPL",
         timeframe="1m",
@@ -111,11 +111,11 @@ def test_vwap_daily_reset():
     """Candles from two different dates cause VWAP to reset."""
     strategy = _configured_strategy()
 
-    day1 = datetime(2024, 1, 1, tzinfo=timezone.utc)
-    day2 = datetime(2024, 1, 2, tzinfo=timezone.utc)
+    day1 = datetime(2024, 1, 1, tzinfo=UTC)
+    day2 = datetime(2024, 1, 2, tzinfo=UTC)
 
     # Feed 35 candles on day 1 to build VWAP state
-    for i in range(35):
+    for _i in range(35):
         strategy.on_candle(make_candle(100.0, high=101.0, low=99.0, open_time=day1))
 
     # Verify state is built up