diff --git a/server/src/wled_controller/api/dependencies.py b/server/src/wled_controller/api/dependencies.py
index 0416850..8c334fb 100644
--- a/server/src/wled_controller/api/dependencies.py
+++ b/server/src/wled_controller/api/dependencies.py
@@ -4,7 +4,7 @@ Uses a registry dict instead of individual module-level globals.
 All getter function signatures remain unchanged for FastAPI Depends() compatibility.
 """
 
-from typing import Any, Dict, Type, TypeVar
+from typing import Any, Dict, TypeVar
 
 from wled_controller.core.processing.processor_manager import ProcessorManager
 from wled_controller.storage import DeviceStore
diff --git a/server/src/wled_controller/api/routes/_preview_helpers.py b/server/src/wled_controller/api/routes/_preview_helpers.py
index 1c515e6..fe9a386 100644
--- a/server/src/wled_controller/api/routes/_preview_helpers.py
+++ b/server/src/wled_controller/api/routes/_preview_helpers.py
@@ -3,16 +3,14 @@
 import asyncio
 import base64
 import io
-import secrets
 import threading
 import time
-from typing import Callable, List, Optional
+from typing import Callable, Optional
 
 import numpy as np
 from PIL import Image
 from starlette.websockets import WebSocket
 
-from wled_controller.config import get_config
 from wled_controller.core.filters import FilterRegistry, ImagePool
 from wled_controller.utils import get_logger
 
diff --git a/server/src/wled_controller/api/routes/audio_templates.py b/server/src/wled_controller/api/routes/audio_templates.py
index f42ab4b..0ef16a4 100644
--- a/server/src/wled_controller/api/routes/audio_templates.py
+++ b/server/src/wled_controller/api/routes/audio_templates.py
@@ -1,7 +1,6 @@
 """Audio capture template and engine routes."""
 
 import asyncio
-import json
 from fastapi import APIRouter, HTTPException, Depends, Query
 from starlette.websockets import WebSocket, WebSocketDisconnect
 
diff --git a/server/src/wled_controller/api/routes/color_strip_processing.py b/server/src/wled_controller/api/routes/color_strip_processing.py
index d74de07..dcef8a8 100644
--- a/server/src/wled_controller/api/routes/color_strip_processing.py
+++ b/server/src/wled_controller/api/routes/color_strip_processing.py
@@ -2,10 +2,8 @@
 
 import asyncio
 import json as _json
-import time as _time
 import uuid as _uuid
 
-import numpy as np
 from fastapi import APIRouter, HTTPException, Depends, Query, WebSocket, WebSocketDisconnect
 
 from wled_controller.api.auth import AuthRequired
diff --git a/server/src/wled_controller/api/routes/color_strip_sources.py b/server/src/wled_controller/api/routes/color_strip_sources.py
index 3485c6b..27fbf3e 100644
--- a/server/src/wled_controller/api/routes/color_strip_sources.py
+++ b/server/src/wled_controller/api/routes/color_strip_sources.py
@@ -32,11 +32,10 @@ from wled_controller.api.schemas.devices import (
 )
 from wled_controller.core.capture.calibration import (
     calibration_from_dict,
-    calibration_to_dict,
 )
 from wled_controller.core.capture.screen_capture import get_available_displays
 from wled_controller.core.processing.processor_manager import ProcessorManager
-from wled_controller.storage.color_strip_source import AdvancedPictureColorStripSource, ApiInputColorStripSource, CompositeColorStripSource, NotificationColorStripSource, PictureColorStripSource, ProcessedColorStripSource
+from wled_controller.storage.color_strip_source import AdvancedPictureColorStripSource, ApiInputColorStripSource, CompositeColorStripSource, NotificationColorStripSource, PictureColorStripSource
 from wled_controller.storage.color_strip_store import ColorStripStore
 from wled_controller.storage.picture_source import ProcessedPictureSource, ScreenCapturePictureSource
 from wled_controller.storage.picture_source_store import PictureSourceStore
@@ -136,7 +135,7 @@ def _extract_css_kwargs(data) -> dict:
     else:
         kwargs["calibration"] = None
     kwargs["stops"] = [s.model_dump() for s in data.stops] if data.stops is not None else None
-    kwargs["layers"] = [l.model_dump() for l in data.layers] if data.layers is not None else None
+    kwargs["layers"] = [layer.model_dump() for layer in data.layers] if data.layers is not None else None
     kwargs["zones"] = [z.model_dump() for z in data.zones] if data.zones is not None else None
     kwargs["animation"] = data.animation.model_dump() if data.animation else None
     return kwargs
@@ -870,7 +869,7 @@ async def test_color_strip_ws(
             meta["border_width"] = cal.border_width
         if is_composite and hasattr(source, "layers"):
             # Send layer info for composite preview
-            enabled_layers = [l for l in source.layers if l.get("enabled", True)]
+            enabled_layers = [layer for layer in source.layers if layer.get("enabled", True)]
             layer_infos = []  # [{name, id, is_notification, has_brightness, ...}, ...]
             for layer in enabled_layers:
                 info = {"id": layer["source_id"], "name": layer.get("source_id", "?"),
diff --git a/server/src/wled_controller/api/routes/devices.py b/server/src/wled_controller/api/routes/devices.py
index ce5d797..992bcd3 100644
--- a/server/src/wled_controller/api/routes/devices.py
+++ b/server/src/wled_controller/api/routes/devices.py
@@ -32,7 +32,6 @@ from wled_controller.core.processing.processor_manager import ProcessorManager
 from wled_controller.storage import DeviceStore
 from wled_controller.storage.output_target_store import OutputTargetStore
 from wled_controller.utils import get_logger
-from wled_controller.storage.base_store import EntityNotFoundError
 
 logger = get_logger(__name__)
 
diff --git a/server/src/wled_controller/api/routes/output_targets.py b/server/src/wled_controller/api/routes/output_targets.py
index 256235e..74f9f8a 100644
--- a/server/src/wled_controller/api/routes/output_targets.py
+++ b/server/src/wled_controller/api/routes/output_targets.py
@@ -3,7 +3,6 @@
 import asyncio
 
 from fastapi import APIRouter, HTTPException, Depends
-from fastapi import Query as QueryParam
 
 from wled_controller.api.auth import AuthRequired
 from wled_controller.api.dependencies import (
diff --git a/server/src/wled_controller/api/routes/output_targets_control.py b/server/src/wled_controller/api/routes/output_targets_control.py
index 56bd7d4..09fecc2 100644
--- a/server/src/wled_controller/api/routes/output_targets_control.py
+++ b/server/src/wled_controller/api/routes/output_targets_control.py
@@ -3,15 +3,12 @@
 Extracted from output_targets.py to keep files under 800 lines.
 """
 
-import asyncio
 
 from fastapi import APIRouter, HTTPException, Depends, Query, WebSocket, WebSocketDisconnect
 
 from wled_controller.api.auth import AuthRequired
 from wled_controller.api.dependencies import (
-    fire_entity_event,
     get_color_strip_store,
-    get_device_store,
     get_output_target_store,
     get_picture_source_store,
     get_processor_manager,
diff --git a/server/src/wled_controller/api/routes/output_targets_keycolors.py b/server/src/wled_controller/api/routes/output_targets_keycolors.py
index c432ab9..608d636 100644
--- a/server/src/wled_controller/api/routes/output_targets_keycolors.py
+++ b/server/src/wled_controller/api/routes/output_targets_keycolors.py
@@ -306,7 +306,7 @@ async def test_kc_target_ws(
     # Load stores
     target_store_inst: OutputTargetStore = get_output_target_store()
     source_store_inst: PictureSourceStore = get_picture_source_store()
-    template_store_inst: TemplateStore = get_template_store()
+    get_template_store()
     pattern_store_inst: PatternTemplateStore = get_pattern_template_store()
     processor_manager_inst: ProcessorManager = get_processor_manager()
     device_store_inst: DeviceStore = get_device_store()
diff --git a/server/src/wled_controller/api/routes/system.py b/server/src/wled_controller/api/routes/system.py
index 64b451b..198719c 100644
--- a/server/src/wled_controller/api/routes/system.py
+++ b/server/src/wled_controller/api/routes/system.py
@@ -55,7 +55,7 @@ logger = get_logger(__name__)
 psutil.cpu_percent(interval=None)
 
 # GPU monitoring (initialized once in utils.gpu, shared with metrics_history)
-from wled_controller.utils.gpu import nvml_available as _nvml_available, nvml as _nvml, nvml_handle as _nvml_handle
+from wled_controller.utils.gpu import nvml_available as _nvml_available, nvml as _nvml, nvml_handle as _nvml_handle  # noqa: E402
 
 
 def _get_cpu_name() -> str | None:
diff --git a/server/src/wled_controller/api/schemas/common.py b/server/src/wled_controller/api/schemas/common.py
index 265b95d..62b031f 100644
--- a/server/src/wled_controller/api/schemas/common.py
+++ b/server/src/wled_controller/api/schemas/common.py
@@ -1,7 +1,7 @@
 """Shared schemas used across multiple route modules."""
 
 from datetime import datetime
-from typing import Dict, List, Optional
+from typing import Dict, Optional
 
 from pydantic import BaseModel, Field
 
diff --git a/server/src/wled_controller/core/audio/analysis.py b/server/src/wled_controller/core/audio/analysis.py
index 77762f0..76d241e 100644
--- a/server/src/wled_controller/core/audio/analysis.py
+++ b/server/src/wled_controller/core/audio/analysis.py
@@ -141,7 +141,6 @@ class AudioAnalyzer:
         Returns:
             AudioAnalysis with spectrum, RMS, beat, etc.
         """
-        chunk_size = self._chunk_size
         alpha = self._smoothing_alpha
         one_minus_alpha = 1.0 - alpha
 
diff --git a/server/src/wled_controller/core/audio/audio_capture.py b/server/src/wled_controller/core/audio/audio_capture.py
index ab3e75a..0a097e9 100644
--- a/server/src/wled_controller/core/audio/audio_capture.py
+++ b/server/src/wled_controller/core/audio/audio_capture.py
@@ -16,8 +16,6 @@ from typing import Any, Dict, List, Optional, Tuple
 from wled_controller.core.audio.analysis import (
     AudioAnalysis,
     AudioAnalyzer,
-    DEFAULT_CHUNK_SIZE,
-    DEFAULT_SAMPLE_RATE,
 )
 from wled_controller.core.audio.base import AudioCaptureStreamBase
 from wled_controller.core.audio.factory import AudioEngineRegistry
diff --git a/server/src/wled_controller/core/automations/automation_engine.py b/server/src/wled_controller/core/automations/automation_engine.py
index b6ad77d..009bcc2 100644
--- a/server/src/wled_controller/core/automations/automation_engine.py
+++ b/server/src/wled_controller/core/automations/automation_engine.py
@@ -3,7 +3,7 @@
 import asyncio
 import re
 from datetime import datetime, timezone
-from typing import Dict, List, Optional, Set
+from typing import Dict, Optional, Set
 
 from wled_controller.core.automations.platform_detector import PlatformDetector
 from wled_controller.storage.automation import (
diff --git a/server/src/wled_controller/core/capture/calibration.py b/server/src/wled_controller/core/capture/calibration.py
index eafad56..95279a8 100644
--- a/server/src/wled_controller/core/capture/calibration.py
+++ b/server/src/wled_controller/core/capture/calibration.py
@@ -1,7 +1,7 @@
 """Calibration system for mapping screen pixels to LED positions."""
 
 from dataclasses import dataclass, field
-from typing import Dict, List, Literal, Optional, Set, Tuple
+from typing import Dict, List, Literal, Set, Tuple
 
 import numpy as np
 
diff --git a/server/src/wled_controller/core/capture/screen_capture.py b/server/src/wled_controller/core/capture/screen_capture.py
index 16b66e3..0640ee8 100644
--- a/server/src/wled_controller/core/capture/screen_capture.py
+++ b/server/src/wled_controller/core/capture/screen_capture.py
@@ -1,7 +1,7 @@
 """Screen capture functionality using mss library."""
 
 from dataclasses import dataclass
-from typing import Dict, List
+from typing import List
 
 import mss
 import numpy as np
diff --git a/server/src/wled_controller/core/capture/screen_overlay.py b/server/src/wled_controller/core/capture/screen_overlay.py
index 989ef56..edbcb7b 100644
--- a/server/src/wled_controller/core/capture/screen_overlay.py
+++ b/server/src/wled_controller/core/capture/screen_overlay.py
@@ -4,9 +4,8 @@ import colorsys
 import logging
 import sys
 import threading
-import time
 import tkinter as tk
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional
 
 from wled_controller.core.capture.calibration import CalibrationConfig
 from wled_controller.core.capture_engines.base import DisplayInfo
diff --git a/server/src/wled_controller/core/capture_engines/bettercam_engine.py b/server/src/wled_controller/core/capture_engines/bettercam_engine.py
index a30115c..0cd5459 100644
--- a/server/src/wled_controller/core/capture_engines/bettercam_engine.py
+++ b/server/src/wled_controller/core/capture_engines/bettercam_engine.py
@@ -4,7 +4,6 @@ import sys
 import time
 from typing import Any, Dict, List, Optional
 
-import numpy as np
 
 from wled_controller.core.capture_engines.base import (
     CaptureEngine,
@@ -145,9 +144,9 @@ class BetterCamEngine(CaptureEngine):
         if sys.platform != "win32":
             return False
         try:
-            import bettercam
-            return True
-        except ImportError:
+            import importlib.util
+            return importlib.util.find_spec("bettercam") is not None
+        except (ImportError, ModuleNotFoundError, ValueError):
             return False
 
     @classmethod
diff --git a/server/src/wled_controller/core/capture_engines/camera_engine.py b/server/src/wled_controller/core/capture_engines/camera_engine.py
index 90a9efa..ecea963 100644
--- a/server/src/wled_controller/core/capture_engines/camera_engine.py
+++ b/server/src/wled_controller/core/capture_engines/camera_engine.py
@@ -14,7 +14,6 @@ import threading
 import time
 from typing import Any, Dict, List, Optional, Set
 
-import numpy as np
 
 from wled_controller.core.capture_engines.base import (
     CaptureEngine,
diff --git a/server/src/wled_controller/core/capture_engines/demo_engine.py b/server/src/wled_controller/core/capture_engines/demo_engine.py
index 9fda824..0754b30 100644
--- a/server/src/wled_controller/core/capture_engines/demo_engine.py
+++ b/server/src/wled_controller/core/capture_engines/demo_engine.py
@@ -74,7 +74,6 @@ class DemoCaptureStream(CaptureStream):
         hue = ((self._angle + rotation) / (2.0 * np.pi)) % 1.0
 
         # Saturation: full
-        sat = 1.0
 
         # Value: bright at centre, fading toward edges
         max_r = float(self._radius.max()) or 1.0
diff --git a/server/src/wled_controller/core/capture_engines/dxcam_engine.py b/server/src/wled_controller/core/capture_engines/dxcam_engine.py
index 26e7988..e0a9e91 100644
--- a/server/src/wled_controller/core/capture_engines/dxcam_engine.py
+++ b/server/src/wled_controller/core/capture_engines/dxcam_engine.py
@@ -4,7 +4,6 @@ import sys
 import time
 from typing import Any, Dict, List, Optional
 
-import numpy as np
 
 from wled_controller.core.capture_engines.base import (
     CaptureEngine,
@@ -145,9 +144,9 @@ class DXcamEngine(CaptureEngine):
         if sys.platform != "win32":
             return False
         try:
-            import dxcam
-            return True
-        except ImportError:
+            import importlib.util
+            return importlib.util.find_spec("dxcam") is not None
+        except (ImportError, ModuleNotFoundError, ValueError):
             return False
 
     @classmethod
diff --git a/server/src/wled_controller/core/capture_engines/mss_engine.py b/server/src/wled_controller/core/capture_engines/mss_engine.py
index 65ab53a..9154cf1 100644
--- a/server/src/wled_controller/core/capture_engines/mss_engine.py
+++ b/server/src/wled_controller/core/capture_engines/mss_engine.py
@@ -91,9 +91,9 @@ class MSSEngine(CaptureEngine):
     @classmethod
     def is_available(cls) -> bool:
         try:
-            import mss
-            return True
-        except ImportError:
+            import importlib.util
+            return importlib.util.find_spec("mss") is not None
+        except (ImportError, ModuleNotFoundError, ValueError):
             return False
 
     @classmethod
diff --git a/server/src/wled_controller/core/capture_engines/wgc_engine.py b/server/src/wled_controller/core/capture_engines/wgc_engine.py
index 84454f5..ec8585b 100644
--- a/server/src/wled_controller/core/capture_engines/wgc_engine.py
+++ b/server/src/wled_controller/core/capture_engines/wgc_engine.py
@@ -5,7 +5,6 @@ import sys
 import threading
 from typing import Any, Dict, List, Optional
 
-import numpy as np
 
 from wled_controller.core.capture_engines.base import (
     CaptureEngine,
@@ -220,9 +219,9 @@ class WGCEngine(CaptureEngine):
             pass
 
         try:
-            import windows_capture
-            return True
-        except ImportError:
+            import importlib.util
+            return importlib.util.find_spec("windows_capture") is not None
+        except (ImportError, ModuleNotFoundError, ValueError):
             return False
 
     @classmethod
diff --git a/server/src/wled_controller/core/devices/adalight_client.py b/server/src/wled_controller/core/devices/adalight_client.py
index a1b5723..e699253 100644
--- a/server/src/wled_controller/core/devices/adalight_client.py
+++ b/server/src/wled_controller/core/devices/adalight_client.py
@@ -2,7 +2,7 @@
 
 import asyncio
 from datetime import datetime, timezone
-from typing import List, Optional, Tuple
+from typing import Optional, Tuple
 
 import numpy as np
 
diff --git a/server/src/wled_controller/core/devices/chroma_client.py b/server/src/wled_controller/core/devices/chroma_client.py
index c2327de..42821e8 100644
--- a/server/src/wled_controller/core/devices/chroma_client.py
+++ b/server/src/wled_controller/core/devices/chroma_client.py
@@ -1,7 +1,6 @@
 """Razer Chroma SDK LED client — controls Razer RGB peripherals via REST API."""
 
 import asyncio
-import json
 from datetime import datetime, timezone
 from typing import List, Optional, Tuple, Union
 
diff --git a/server/src/wled_controller/core/devices/chroma_provider.py b/server/src/wled_controller/core/devices/chroma_provider.py
index afd679d..1afa94e 100644
--- a/server/src/wled_controller/core/devices/chroma_provider.py
+++ b/server/src/wled_controller/core/devices/chroma_provider.py
@@ -1,6 +1,5 @@
 """Razer Chroma SDK device provider — control Razer RGB peripherals."""
 
-from datetime import datetime, timezone
 from typing import List
 
 from wled_controller.core.devices.led_client import (
diff --git a/server/src/wled_controller/core/devices/dmx_client.py b/server/src/wled_controller/core/devices/dmx_client.py
index ca9b42a..17c9f60 100644
--- a/server/src/wled_controller/core/devices/dmx_client.py
+++ b/server/src/wled_controller/core/devices/dmx_client.py
@@ -7,7 +7,7 @@ from typing import List, Optional, Tuple, Union
 
 import numpy as np
 
-from wled_controller.core.devices.led_client import LEDClient, DeviceHealth
+from wled_controller.core.devices.led_client import LEDClient
 from wled_controller.utils import get_logger
 
 logger = get_logger(__name__)
diff --git a/server/src/wled_controller/core/devices/espnow_provider.py b/server/src/wled_controller/core/devices/espnow_provider.py
index 4291066..ac345bc 100644
--- a/server/src/wled_controller/core/devices/espnow_provider.py
+++ b/server/src/wled_controller/core/devices/espnow_provider.py
@@ -1,6 +1,5 @@
 """ESP-NOW device provider — ultra-low-latency LED control via ESP32 gateway."""
 
-from datetime import datetime, timezone
 from typing import List
 
 from wled_controller.core.devices.led_client import (
diff --git a/server/src/wled_controller/core/devices/gamesense_client.py b/server/src/wled_controller/core/devices/gamesense_client.py
index 9e8ee64..59ab694 100644
--- a/server/src/wled_controller/core/devices/gamesense_client.py
+++ b/server/src/wled_controller/core/devices/gamesense_client.py
@@ -1,6 +1,5 @@
 """SteelSeries GameSense LED client — controls SteelSeries RGB peripherals via REST API."""
 
-import asyncio
 import json
 import os
 import platform
diff --git a/server/src/wled_controller/core/devices/gamesense_provider.py b/server/src/wled_controller/core/devices/gamesense_provider.py
index 357c9fb..0ef5afd 100644
--- a/server/src/wled_controller/core/devices/gamesense_provider.py
+++ b/server/src/wled_controller/core/devices/gamesense_provider.py
@@ -1,6 +1,5 @@
 """SteelSeries GameSense device provider — control SteelSeries RGB peripherals."""
 
-from datetime import datetime, timezone
 from typing import List
 
 from wled_controller.core.devices.led_client import (
diff --git a/server/src/wled_controller/core/devices/hue_provider.py b/server/src/wled_controller/core/devices/hue_provider.py
index 52d9355..1d65cb0 100644
--- a/server/src/wled_controller/core/devices/hue_provider.py
+++ b/server/src/wled_controller/core/devices/hue_provider.py
@@ -1,7 +1,6 @@
 """Philips Hue device provider — entertainment streaming to Hue lights."""
 
 import asyncio
-from datetime import datetime, timezone
 from typing import List, Tuple
 
 from wled_controller.core.devices.led_client import (
diff --git a/server/src/wled_controller/core/devices/led_client.py b/server/src/wled_controller/core/devices/led_client.py
index b26d41a..71671f1 100644
--- a/server/src/wled_controller/core/devices/led_client.py
+++ b/server/src/wled_controller/core/devices/led_client.py
@@ -1,7 +1,7 @@
 """Abstract base class for LED device communication clients and provider registry."""
 
 from abc import ABC, abstractmethod
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from datetime import datetime, timezone
 from typing import Dict, List, Optional, Tuple, Union
 
diff --git a/server/src/wled_controller/core/devices/mqtt_client.py b/server/src/wled_controller/core/devices/mqtt_client.py
index 55d0db8..0c1d69f 100644
--- a/server/src/wled_controller/core/devices/mqtt_client.py
+++ b/server/src/wled_controller/core/devices/mqtt_client.py
@@ -1,7 +1,7 @@
 """MQTT LED client — publishes pixel data to an MQTT topic."""
 
 import json
-from typing import List, Optional, Tuple, Union
+from typing import List, Tuple, Union
 
 import numpy as np
 
diff --git a/server/src/wled_controller/core/devices/mqtt_provider.py b/server/src/wled_controller/core/devices/mqtt_provider.py
index 413d3d0..99a4aea 100644
--- a/server/src/wled_controller/core/devices/mqtt_provider.py
+++ b/server/src/wled_controller/core/devices/mqtt_provider.py
@@ -1,7 +1,6 @@
 """MQTT device provider — factory, validation, health checks."""
 
-from datetime import datetime
-from typing import List, Optional, Tuple
+from typing import List
 
 from wled_controller.core.devices.led_client import (
     DeviceHealth,
@@ -11,7 +10,6 @@ from wled_controller.core.devices.led_client import (
 )
 from wled_controller.core.devices.mqtt_client import (
     MQTTLEDClient,
-    get_mqtt_service,
     parse_mqtt_url,
 )
 from wled_controller.utils import get_logger
diff --git a/server/src/wled_controller/core/devices/openrgb_client.py b/server/src/wled_controller/core/devices/openrgb_client.py
index e6c9db6..5e57cd6 100644
--- a/server/src/wled_controller/core/devices/openrgb_client.py
+++ b/server/src/wled_controller/core/devices/openrgb_client.py
@@ -5,7 +5,7 @@ import socket
 import struct
 import threading
 from datetime import datetime, timezone
-from typing import Any, Dict, List, Optional, Tuple, Union
+from typing import Any, List, Optional, Tuple, Union
 
 import numpy as np
 
@@ -165,7 +165,6 @@ class OpenRGBLEDClient(LEDClient):
     def _connect_sync(self) -> Tuple[Any, Any]:
         """Synchronous connect — runs in thread pool."""
         from openrgb import OpenRGBClient
-        from openrgb.utils import DeviceType
 
         client = OpenRGBClient(self._host, self._port, name="WLED Controller")
         devices = client.devices
diff --git a/server/src/wled_controller/core/devices/openrgb_provider.py b/server/src/wled_controller/core/devices/openrgb_provider.py
index 29e0ee3..c8e9218 100644
--- a/server/src/wled_controller/core/devices/openrgb_provider.py
+++ b/server/src/wled_controller/core/devices/openrgb_provider.py
@@ -1,7 +1,7 @@
 """OpenRGB device provider — factory, validation, health checks, discovery."""
 
 import asyncio
-from typing import List, Optional, Tuple
+from typing import List, Tuple
 
 from wled_controller.core.devices.led_client import (
     DeviceHealth,
diff --git a/server/src/wled_controller/core/devices/serial_provider.py b/server/src/wled_controller/core/devices/serial_provider.py
index 53fe5d8..284609e 100644
--- a/server/src/wled_controller/core/devices/serial_provider.py
+++ b/server/src/wled_controller/core/devices/serial_provider.py
@@ -12,7 +12,6 @@ import numpy as np
 from wled_controller.core.devices.led_client import (
     DeviceHealth,
     DiscoveredDevice,
-    LEDClient,
     LEDDeviceProvider,
 )
 from wled_controller.utils import get_logger
diff --git a/server/src/wled_controller/core/devices/spi_client.py b/server/src/wled_controller/core/devices/spi_client.py
index 3a4762c..3bdeb4c 100644
--- a/server/src/wled_controller/core/devices/spi_client.py
+++ b/server/src/wled_controller/core/devices/spi_client.py
@@ -94,7 +94,7 @@ class SPIClient(LEDClient):
     def _connect_rpi_ws281x(self):
         """Connect via rpi_ws281x library (GPIO PWM/DMA)."""
         try:
-            from rpi_ws281x import PixelStrip, Color
+            from rpi_ws281x import PixelStrip
         except ImportError:
             raise RuntimeError(
                 "rpi_ws281x is required for GPIO LED control: "
@@ -254,8 +254,10 @@ class SPIClient(LEDClient):
         else:
             # GPIO — check if we can import rpi_ws281x
             try:
-                import rpi_ws281x
-                return DeviceHealth(online=True, latency_ms=0.0, last_checked=datetime.now(timezone.utc))
+                import importlib.util
+                if importlib.util.find_spec("rpi_ws281x") is not None:
+                    return DeviceHealth(online=True, latency_ms=0.0, last_checked=datetime.now(timezone.utc))
+                raise ImportError("rpi_ws281x not found")
             except ImportError:
                 return DeviceHealth(
                     online=False,
diff --git a/server/src/wled_controller/core/devices/spi_provider.py b/server/src/wled_controller/core/devices/spi_provider.py
index 8e7f1d9..d41d5f4 100644
--- a/server/src/wled_controller/core/devices/spi_provider.py
+++ b/server/src/wled_controller/core/devices/spi_provider.py
@@ -1,7 +1,6 @@
 """SPI Direct device provider — Raspberry Pi GPIO/SPI direct LED strip control."""
 
 import platform
-from datetime import datetime, timezone
 from typing import List
 
 from wled_controller.core.devices.led_client import (
diff --git a/server/src/wled_controller/core/devices/usbhid_provider.py b/server/src/wled_controller/core/devices/usbhid_provider.py
index e32f59a..4d504e1 100644
--- a/server/src/wled_controller/core/devices/usbhid_provider.py
+++ b/server/src/wled_controller/core/devices/usbhid_provider.py
@@ -1,6 +1,5 @@
 """USB HID LED device provider — control RGB peripherals via USB HID."""
 
-from datetime import datetime, timezone
 from typing import List
 
 from wled_controller.core.devices.led_client import (
diff --git a/server/src/wled_controller/core/devices/wled_client.py b/server/src/wled_controller/core/devices/wled_client.py
index e091240..2de2be7 100644
--- a/server/src/wled_controller/core/devices/wled_client.py
+++ b/server/src/wled_controller/core/devices/wled_client.py
@@ -134,7 +134,7 @@ class WLEDClient(LEDClient):
                 except Exception as e:
                     logger.warning(f"Could not configure device for DDP: {e}")
 
-                logger.info(f"DDP protocol enabled for pixel data transmission (RGB mode)")
+                logger.info("DDP protocol enabled for pixel data transmission (RGB mode)")
 
             self._connected = True
 
@@ -381,7 +381,7 @@ class WLEDClient(LEDClient):
             # Note: brightness already applied by processor loop (_cached_brightness)
             logger.debug(f"Sending {len(pixels)} LEDs via DDP")
             self._ddp_client.send_pixels_numpy(pixels)
-            logger.debug(f"Successfully sent pixel colors via DDP")
+            logger.debug("Successfully sent pixel colors via DDP")
             return True
 
         except Exception as e:
@@ -430,7 +430,7 @@ class WLEDClient(LEDClient):
             logger.debug(f"Payload size: ~{len(str(payload))} bytes")
 
             await self._request("POST", "/json/state", json_data=payload)
-            logger.debug(f"Successfully sent pixel colors via HTTP")
+            logger.debug("Successfully sent pixel colors via HTTP")
             return True
 
         except Exception as e:
diff --git a/server/src/wled_controller/core/devices/ws_provider.py b/server/src/wled_controller/core/devices/ws_provider.py
index 51fde3b..afb0c13 100644
--- a/server/src/wled_controller/core/devices/ws_provider.py
+++ b/server/src/wled_controller/core/devices/ws_provider.py
@@ -9,7 +9,7 @@ from wled_controller.core.devices.led_client import (
     LEDClient,
     LEDDeviceProvider,
 )
-from wled_controller.core.devices.ws_client import WSLEDClient, parse_ws_url
+from wled_controller.core.devices.ws_client import WSLEDClient
 from wled_controller.utils import get_logger
 
 logger = get_logger(__name__)
diff --git a/server/src/wled_controller/core/filters/auto_crop.py b/server/src/wled_controller/core/filters/auto_crop.py
index ab037b2..cf9b8f5 100644
--- a/server/src/wled_controller/core/filters/auto_crop.py
+++ b/server/src/wled_controller/core/filters/auto_crop.py
@@ -1,6 +1,6 @@
 """Auto-crop postprocessing filter."""
 
-from typing import Any, Dict, List, Optional
+from typing import List, Optional
 
 import numpy as np
 
diff --git a/server/src/wled_controller/core/filters/base.py b/server/src/wled_controller/core/filters/base.py
index dc0de18..5926cbb 100644
--- a/server/src/wled_controller/core/filters/base.py
+++ b/server/src/wled_controller/core/filters/base.py
@@ -1,11 +1,16 @@
 """Base classes for the postprocessing filter system."""
 
+from __future__ import annotations
+
 from abc import ABC, abstractmethod
-from dataclasses import dataclass, field
-from typing import Any, Dict, List, Optional
+from dataclasses import dataclass
+from typing import TYPE_CHECKING, Any, Dict, List, Optional
 
 import numpy as np
 
+if TYPE_CHECKING:
+    from wled_controller.core.filters.image_pool import ImagePool
+
 
 @dataclass
 class FilterOptionDef:
diff --git a/server/src/wled_controller/core/filters/downscaler.py b/server/src/wled_controller/core/filters/downscaler.py
index 081572e..f0a0fc0 100644
--- a/server/src/wled_controller/core/filters/downscaler.py
+++ b/server/src/wled_controller/core/filters/downscaler.py
@@ -1,6 +1,6 @@
 """Downscaler postprocessing filter."""
 
-from typing import Any, Dict, List, Optional
+from typing import List, Optional
 
 import cv2
 import numpy as np
diff --git a/server/src/wled_controller/core/filters/flip.py b/server/src/wled_controller/core/filters/flip.py
index bad8362..458a320 100644
--- a/server/src/wled_controller/core/filters/flip.py
+++ b/server/src/wled_controller/core/filters/flip.py
@@ -1,6 +1,6 @@
 """Flip postprocessing filter."""
 
-from typing import Any, Dict, List, Optional
+from typing import List, Optional
 
 import numpy as np
 
diff --git a/server/src/wled_controller/core/filters/pixelate.py b/server/src/wled_controller/core/filters/pixelate.py
index 5668c24..f1836cb 100644
--- a/server/src/wled_controller/core/filters/pixelate.py
+++ b/server/src/wled_controller/core/filters/pixelate.py
@@ -1,6 +1,6 @@
 """Pixelate postprocessing filter."""
 
-from typing import Any, Dict, List, Optional
+from typing import List, Optional
 
 import cv2
 import numpy as np
diff --git a/server/src/wled_controller/core/filters/registry.py b/server/src/wled_controller/core/filters/registry.py
index 130f7f9..2f17cb8 100644
--- a/server/src/wled_controller/core/filters/registry.py
+++ b/server/src/wled_controller/core/filters/registry.py
@@ -1,6 +1,6 @@
 """Filter registry for discovering and instantiating postprocessing filters."""
 
-from typing import Dict, List, Type
+from typing import Dict, Type
 
 from wled_controller.core.filters.base import PostprocessingFilter
 from wled_controller.utils import get_logger
diff --git a/server/src/wled_controller/core/processing/auto_restart.py b/server/src/wled_controller/core/processing/auto_restart.py
index 41f01c4..309d04a 100644
--- a/server/src/wled_controller/core/processing/auto_restart.py
+++ b/server/src/wled_controller/core/processing/auto_restart.py
@@ -9,7 +9,7 @@ Extracted from processor_manager.py to keep files under 800 lines.
 import asyncio
 import time
 from dataclasses import dataclass
-from typing import Dict, Optional
+from typing import Optional
 
 from wled_controller.utils import get_logger
 
diff --git a/server/src/wled_controller/core/processing/color_strip_stream.py b/server/src/wled_controller/core/processing/color_strip_stream.py
index 93bfd7b..9af9e1c 100644
--- a/server/src/wled_controller/core/processing/color_strip_stream.py
+++ b/server/src/wled_controller/core/processing/color_strip_stream.py
@@ -19,9 +19,8 @@ from typing import Optional
 
 import numpy as np
 
-from wled_controller.core.capture.calibration import CalibrationConfig, PixelMapper, AdvancedPixelMapper, create_pixel_mapper
+from wled_controller.core.capture.calibration import CalibrationConfig, AdvancedPixelMapper, create_pixel_mapper
 from wled_controller.core.capture.screen_capture import extract_border_pixels
-from wled_controller.core.processing.live_stream import LiveStream
 from wled_controller.utils import get_logger
 from wled_controller.utils.timer import high_resolution_timer
 
@@ -107,7 +106,6 @@ class PictureColorStripStream(ColorStripStream):
                          Lifecycle managed by ColorStripStreamManager.
             source: PictureColorStripSource config
         """
-        from wled_controller.storage.color_strip_source import PictureColorStripSource
 
         # Support both single LiveStream and dict of streams (advanced mode)
         if isinstance(live_stream, dict):
@@ -1093,7 +1091,9 @@ class GradientColorStripStream(ColorStripStream):
                                     (4, tt, p, v_arr), (5, v_arr, p, q),
                                 ):
                                     m = hi == sxt
-                                    ro[m] = rv[m]; go[m] = gv[m]; bo[m] = bv[m]
+                                    ro[m] = rv[m]
+                                    go[m] = gv[m]
+                                    bo[m] = bv[m]
                                 buf[:, 0] = np.clip(ro * 255.0, 0, 255).astype(np.uint8)
                                 buf[:, 1] = np.clip(go * 255.0, 0, 255).astype(np.uint8)
                                 buf[:, 2] = np.clip(bo * 255.0, 0, 255).astype(np.uint8)
diff --git a/server/src/wled_controller/core/processing/composite_stream.py b/server/src/wled_controller/core/processing/composite_stream.py
index f73ca6b..a9446ff 100644
--- a/server/src/wled_controller/core/processing/composite_stream.py
+++ b/server/src/wled_controller/core/processing/composite_stream.py
@@ -127,7 +127,7 @@ class CompositeColorStripStream(ColorStripStream):
 
     def get_layer_brightness(self) -> List[Optional[float]]:
         """Return per-layer brightness values (0.0-1.0) from value sources, or None if no source."""
-        enabled = [l for l in self._layers if l.get("enabled", True)]
+        enabled = [layer for layer in self._layers if layer.get("enabled", True)]
         result: List[Optional[float]] = []
         with self._sub_lock:
             for i in range(len(enabled)):
@@ -155,10 +155,10 @@ class CompositeColorStripStream(ColorStripStream):
     def update_source(self, source) -> None:
         """Hot-update: rebuild sub-streams if layer config changed."""
         new_layers = list(source.layers)
-        old_layer_ids = [(l.get("source_id"), l.get("blend_mode"), l.get("opacity"), l.get("enabled"), l.get("brightness_source_id"))
-                         for l in self._layers]
-        new_layer_ids = [(l.get("source_id"), l.get("blend_mode"), l.get("opacity"), l.get("enabled"), l.get("brightness_source_id"))
-                         for l in new_layers]
+        old_layer_ids = [(layer.get("source_id"), layer.get("blend_mode"), layer.get("opacity"), layer.get("enabled"), layer.get("brightness_source_id"))
+                         for layer in self._layers]
+        new_layer_ids = [(layer.get("source_id"), layer.get("blend_mode"), layer.get("opacity"), layer.get("enabled"), layer.get("brightness_source_id"))
+                         for layer in new_layers]
 
         self._layers = new_layers
 
diff --git a/server/src/wled_controller/core/processing/daylight_stream.py b/server/src/wled_controller/core/processing/daylight_stream.py
index 823684b..e3df66e 100644
--- a/server/src/wled_controller/core/processing/daylight_stream.py
+++ b/server/src/wled_controller/core/processing/daylight_stream.py
@@ -5,7 +5,6 @@ that transitions through dawn, daylight, sunset, and night over a continuous
 24-hour cycle.  Can use real wall-clock time or a configurable simulation speed.
 """
 
-import math
 import threading
 import time
 from typing import Optional
diff --git a/server/src/wled_controller/core/processing/device_test_mode.py b/server/src/wled_controller/core/processing/device_test_mode.py
index 0190bc3..c6113db 100644
--- a/server/src/wled_controller/core/processing/device_test_mode.py
+++ b/server/src/wled_controller/core/processing/device_test_mode.py
@@ -3,7 +3,7 @@
 Extracted from processor_manager.py to keep files under 800 lines.
 """
 
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional
 
 from wled_controller.core.capture.calibration import CalibrationConfig
 from wled_controller.core.devices.led_client import create_led_client
diff --git a/server/src/wled_controller/core/processing/live_stream_manager.py b/server/src/wled_controller/core/processing/live_stream_manager.py
index cae9254..c974a04 100644
--- a/server/src/wled_controller/core/processing/live_stream_manager.py
+++ b/server/src/wled_controller/core/processing/live_stream_manager.py
@@ -15,7 +15,7 @@ import httpx
 import numpy as np
 
 from wled_controller.core.capture_engines import EngineRegistry
-from wled_controller.core.filters import FilterRegistry, PostprocessingFilter
+from wled_controller.core.filters import FilterRegistry
 from wled_controller.core.processing.live_stream import (
     LiveStream,
     ProcessedLiveStream,
diff --git a/server/src/wled_controller/core/processing/target_processor.py b/server/src/wled_controller/core/processing/target_processor.py
index 6c3fcde..782c76a 100644
--- a/server/src/wled_controller/core/processing/target_processor.py
+++ b/server/src/wled_controller/core/processing/target_processor.py
@@ -12,9 +12,9 @@ from __future__ import annotations
 
 import asyncio
 from abc import ABC, abstractmethod
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from datetime import datetime
-from typing import TYPE_CHECKING, Callable, Dict, List, Optional, Tuple
+from typing import TYPE_CHECKING, Callable, Dict, Optional, Tuple
 
 if TYPE_CHECKING:
     from wled_controller.core.processing.color_strip_stream_manager import ColorStripStreamManager
diff --git a/server/src/wled_controller/core/processing/wled_target_processor.py b/server/src/wled_controller/core/processing/wled_target_processor.py
index 26c7e03..a72b930 100644
--- a/server/src/wled_controller/core/processing/wled_target_processor.py
+++ b/server/src/wled_controller/core/processing/wled_target_processor.py
@@ -613,7 +613,7 @@ class WledTargetProcessor(TargetProcessor):
         last_send_time = 0.0
         _last_preview_broadcast = 0.0
         prev_frame_time_stamp = time.perf_counter()
-        loop = asyncio.get_running_loop()
+        asyncio.get_running_loop()
         _init_device_info = self._ctx.get_device_info(self._device_id)
         _total_leds = getattr(self, '_effective_led_count', None) or (_init_device_info.led_count if _init_device_info else 0)
 
diff --git a/server/src/wled_controller/demo.py b/server/src/wled_controller/demo.py
index bd406ff..11c1c0a 100644
--- a/server/src/wled_controller/demo.py
+++ b/server/src/wled_controller/demo.py
@@ -8,7 +8,6 @@ Equivalent to setting WLED_DEMO=true before starting the regular server.
 """
 
 import os
-import sys
 
 
 def main():
diff --git a/server/src/wled_controller/storage/color_strip_store.py b/server/src/wled_controller/storage/color_strip_store.py
index f3a08af..3721396 100644
--- a/server/src/wled_controller/storage/color_strip_store.py
+++ b/server/src/wled_controller/storage/color_strip_store.py
@@ -2,26 +2,15 @@
 
 import uuid
 from datetime import datetime, timezone
-from typing import List, Optional
+from typing import List
 
 from wled_controller.storage.base_store import BaseJsonStore
 from wled_controller.storage.utils import resolve_ref
 from wled_controller.storage.color_strip_source import (
-    AdvancedPictureColorStripSource,
-    ApiInputColorStripSource,
-    AudioColorStripSource,
-    CandlelightColorStripSource,
-    ColorCycleColorStripSource,
     ColorStripSource,
     CompositeColorStripSource,
-    DaylightColorStripSource,
-    EffectColorStripSource,
-    GradientColorStripSource,
     MappedColorStripSource,
-    NotificationColorStripSource,
-    PictureColorStripSource,
     ProcessedColorStripSource,
-    StaticColorStripSource,
 )
 from wled_controller.utils import get_logger
 
diff --git a/server/src/wled_controller/storage/device_store.py b/server/src/wled_controller/storage/device_store.py
index eb024f4..8e46eed 100644
--- a/server/src/wled_controller/storage/device_store.py
+++ b/server/src/wled_controller/storage/device_store.py
@@ -4,7 +4,7 @@ import json
 import uuid
 from datetime import datetime, timezone
 from pathlib import Path
-from typing import Dict, List, Optional
+from typing import List, Optional
 
 from wled_controller.storage.base_store import BaseJsonStore
 from wled_controller.utils import get_logger
diff --git a/server/src/wled_controller/storage/key_colors_output_target.py b/server/src/wled_controller/storage/key_colors_output_target.py
index 84fcc40..292102e 100644
--- a/server/src/wled_controller/storage/key_colors_output_target.py
+++ b/server/src/wled_controller/storage/key_colors_output_target.py
@@ -2,7 +2,6 @@
 
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
-from typing import List, Optional
 
 from wled_controller.storage.output_target import OutputTarget
 from wled_controller.storage.utils import resolve_ref
diff --git a/server/src/wled_controller/storage/output_target_store.py b/server/src/wled_controller/storage/output_target_store.py
index 82d894f..1d697f3 100644
--- a/server/src/wled_controller/storage/output_target_store.py
+++ b/server/src/wled_controller/storage/output_target_store.py
@@ -1,6 +1,5 @@
 """Output target storage using JSON files."""
 
-import json
 import uuid
 from datetime import datetime, timezone
 from typing import List, Optional
diff --git a/server/src/wled_controller/utils/monitor_names.py b/server/src/wled_controller/utils/monitor_names.py
index 810c374..3068d61 100644
--- a/server/src/wled_controller/utils/monitor_names.py
+++ b/server/src/wled_controller/utils/monitor_names.py
@@ -1,7 +1,7 @@
 """Utility functions for retrieving friendly monitor/display names."""
 
 import sys
-from typing import Dict, Optional
+from typing import Dict
 
 from wled_controller.utils import get_logger
 
@@ -129,7 +129,7 @@ def get_monitor_refresh_rates() -> Dict[int, int]:
         # Enumerate all display devices
         idx = 0
         while True:
-            device_name = ctypes.create_unicode_buffer(32)
+            ctypes.create_unicode_buffer(32)
             if not user32.EnumDisplayDevicesW(None, idx, None, 0):
                 # Try getting display settings by index
                 devmode = DEVMODE()
diff --git a/server/tests/api/routes/test_devices_routes.py b/server/tests/api/routes/test_devices_routes.py
index 159aff1..b8427f0 100644
--- a/server/tests/api/routes/test_devices_routes.py
+++ b/server/tests/api/routes/test_devices_routes.py
@@ -4,8 +4,7 @@ These tests exercise the FastAPI route handlers using dependency override
 to inject test stores, avoiding real hardware dependencies.
 """
 
-from datetime import datetime, timezone
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 from fastapi import FastAPI
diff --git a/server/tests/api/routes/test_webhooks_routes.py b/server/tests/api/routes/test_webhooks_routes.py
index 3a94e56..cc56829 100644
--- a/server/tests/api/routes/test_webhooks_routes.py
+++ b/server/tests/api/routes/test_webhooks_routes.py
@@ -1,7 +1,6 @@
 """Tests for webhook routes — trigger, validation, rate limiting."""
 
 import time
-from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
diff --git a/server/tests/conftest.py b/server/tests/conftest.py
index 9f7937f..e939709 100644
--- a/server/tests/conftest.py
+++ b/server/tests/conftest.py
@@ -1,10 +1,6 @@
 """Pytest configuration and shared fixtures."""
 
-import json
-import os
 from datetime import datetime, timezone
-from pathlib import Path
-from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
@@ -15,11 +11,8 @@ from wled_controller.storage.sync_clock_store import SyncClockStore
 from wled_controller.storage.output_target_store import OutputTargetStore
 from wled_controller.storage.automation import (
     Automation,
-    AlwaysCondition,
-    WebhookCondition,
 )
 from wled_controller.storage.automation_store import AutomationStore
-from wled_controller.storage.value_source import StaticValueSource, ValueSource
 from wled_controller.storage.value_source_store import ValueSourceStore
 
 
diff --git a/server/tests/core/test_automation_engine.py b/server/tests/core/test_automation_engine.py
index 90f006b..c720213 100644
--- a/server/tests/core/test_automation_engine.py
+++ b/server/tests/core/test_automation_engine.py
@@ -1,8 +1,7 @@
 """Tests for AutomationEngine — condition evaluation in isolation."""
 
-import asyncio
 from datetime import datetime, timezone
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 
@@ -12,7 +11,6 @@ from wled_controller.storage.automation import (
     ApplicationCondition,
     Automation,
     DisplayStateCondition,
-    MQTTCondition,
     StartupCondition,
     SystemIdleCondition,
     TimeOfDayCondition,
diff --git a/server/tests/core/test_sync_clock_runtime.py b/server/tests/core/test_sync_clock_runtime.py
index 299fc20..62b5c43 100644
--- a/server/tests/core/test_sync_clock_runtime.py
+++ b/server/tests/core/test_sync_clock_runtime.py
@@ -3,7 +3,6 @@
 import threading
 import time
 
-import pytest
 
 from wled_controller.core.processing.sync_clock_runtime import SyncClockRuntime
 
diff --git a/server/tests/e2e/test_auth_flow.py b/server/tests/e2e/test_auth_flow.py
index 90fc183..d923faf 100644
--- a/server/tests/e2e/test_auth_flow.py
+++ b/server/tests/e2e/test_auth_flow.py
@@ -7,9 +7,7 @@ Uses the `client` fixture (which has the correct auth header set), and
 helpers to make unauthenticated requests by temporarily removing the header.
 """
 
-import pytest
 
-from tests.e2e.conftest import API_KEY
 
 
 def _unauth_get(client, url):
diff --git a/server/tests/e2e/test_backup_flow.py b/server/tests/e2e/test_backup_flow.py
index 2f46703..c6c2d01 100644
--- a/server/tests/e2e/test_backup_flow.py
+++ b/server/tests/e2e/test_backup_flow.py
@@ -6,7 +6,6 @@ Tests creating entities, backing up, deleting, then restoring from backup.
 import io
 import json
 
-import pytest
 
 
 class TestBackupRestoreFlow:
diff --git a/server/tests/e2e/test_color_strip_flow.py b/server/tests/e2e/test_color_strip_flow.py
index 78454a4..b74fc49 100644
--- a/server/tests/e2e/test_color_strip_flow.py
+++ b/server/tests/e2e/test_color_strip_flow.py
@@ -3,7 +3,6 @@
 Tests creating, listing, updating, cloning, and deleting color strip sources.
 """
 
-import pytest
 
 
 class TestColorStripSourceLifecycle:
diff --git a/server/tests/e2e/test_device_flow.py b/server/tests/e2e/test_device_flow.py
index 6dc971c..bf2dbad 100644
--- a/server/tests/e2e/test_device_flow.py
+++ b/server/tests/e2e/test_device_flow.py
@@ -4,7 +4,6 @@ Tests the complete device lifecycle through the API:
 create -> get -> update -> brightness -> power -> delete -> verify gone.
 """
 
-import pytest
 
 
 class TestDeviceLifecycle:
diff --git a/server/tests/e2e/test_target_flow.py b/server/tests/e2e/test_target_flow.py
index e16a695..f4a06af 100644
--- a/server/tests/e2e/test_target_flow.py
+++ b/server/tests/e2e/test_target_flow.py
@@ -4,7 +4,6 @@ Tests target CRUD with a dependency on a device:
 create device -> create target -> list -> update -> delete target -> cleanup device.
 """
 
-import pytest
 
 
 class TestOutputTargetLifecycle:
diff --git a/server/tests/storage/test_base_store.py b/server/tests/storage/test_base_store.py
index 9c9db55..5c902ac 100644
--- a/server/tests/storage/test_base_store.py
+++ b/server/tests/storage/test_base_store.py
@@ -1,7 +1,6 @@
 """Tests for BaseJsonStore — the shared data-layer base class."""
 
 import json
-import threading
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from dataclasses import dataclass
 from pathlib import Path
diff --git a/server/tests/storage/test_device_store.py b/server/tests/storage/test_device_store.py
index f0305a3..f22c874 100644
--- a/server/tests/storage/test_device_store.py
+++ b/server/tests/storage/test_device_store.py
@@ -1,6 +1,5 @@
 """Tests for DeviceStore — device CRUD, persistence, name uniqueness, thread safety."""
 
-import threading
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from pathlib import Path
 
diff --git a/server/tests/storage/test_output_target_store.py b/server/tests/storage/test_output_target_store.py
index cb90962..3ee9958 100644
--- a/server/tests/storage/test_output_target_store.py
+++ b/server/tests/storage/test_output_target_store.py
@@ -7,7 +7,6 @@ from wled_controller.storage.output_target_store import OutputTargetStore
 from wled_controller.storage.wled_output_target import WledOutputTarget
 from wled_controller.storage.key_colors_output_target import (
     KeyColorsOutputTarget,
-    KeyColorsSettings,
 )
 
 
diff --git a/server/tests/test_api.py b/server/tests/test_api.py
index c4bde7f..e3729bd 100644
--- a/server/tests/test_api.py
+++ b/server/tests/test_api.py
@@ -1,6 +1,5 @@
 """Tests for API endpoints (public + authenticated)."""
 
-import pytest
 from fastapi.testclient import TestClient
 
 from wled_controller.main import app
diff --git a/server/tests/test_config.py b/server/tests/test_config.py
index c185b58..204f7df 100644
--- a/server/tests/test_config.py
+++ b/server/tests/test_config.py
@@ -1,7 +1,5 @@
 """Tests for configuration management."""
 
-import os
-from pathlib import Path
 
 import pytest
 import yaml
@@ -9,13 +7,8 @@ import yaml
 from wled_controller.config import (
     Config,
     ServerConfig,
-    StorageConfig,
-    AuthConfig,
-    MQTTConfig,
-    LoggingConfig,
     get_config,
     reload_config,
-    is_demo_mode,
 )
 
 
diff --git a/server/tests/test_device_store.py b/server/tests/test_device_store.py
index c8acf1d..623af66 100644
--- a/server/tests/test_device_store.py
+++ b/server/tests/test_device_store.py
@@ -1,7 +1,6 @@
 """Tests for device storage."""
 
 import pytest
-from pathlib import Path
 
 from wled_controller.storage.device_store import Device, DeviceStore
 
diff --git a/server/tests/test_processor_manager.py b/server/tests/test_processor_manager.py
index 8118017..c696294 100644
--- a/server/tests/test_processor_manager.py
+++ b/server/tests/test_processor_manager.py
@@ -1,9 +1,6 @@
 """Tests for processor manager."""
 
-import asyncio
 import pytest
-import respx
-from httpx import Response
 
 from wled_controller.core.processing.processor_manager import ProcessorManager
 from wled_controller.core.processing.processing_settings import ProcessingSettings