diff --git a/.gitignore b/.gitignore
index b85b0cb..f5aae13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,9 +16,15 @@ __pycache__/
 *.pyc
 *.pyo
 .venv/
+.venv-*/
+*.egg-info/
+dist/
+build/
 .pytest_cache/
 .mypy_cache/
 .ruff_cache/
+htmlcov/
+.coverage
 
 # OS / editor noise
 .DS_Store
diff --git a/app/main.py b/app/main.py
index 1d661d7..bfdf0dd 100644
--- a/app/main.py
+++ b/app/main.py
@@ -92,9 +92,11 @@ def job_detail(request: Request, job_id: str) -> HTMLResponse:
     paths = pipeline.job_paths(stem)
     status = pipeline.read_status(stem) or {}
     manifest = pipeline.read_manifest(stem) or {"variants": []}
-    intermediates = sorted(
-        p.name for p in paths.intermediates.glob(f"{stem}_*.png") if p.is_file()
-    ) if paths.intermediates.exists() else []
+    intermediates = (
+        sorted(p.name for p in paths.intermediates.glob(f"{stem}_*.png") if p.is_file())
+        if paths.intermediates.exists()
+        else []
+    )
 
     return templates.TemplateResponse(
         "job.html",
diff --git a/app/pipeline.py b/app/pipeline.py
index d63c2a5..aa78f98 100644
--- a/app/pipeline.py
+++ b/app/pipeline.py
@@ -17,11 +17,12 @@ import subprocess
 import sys
 import time
 import uuid
+from collections.abc import Iterator
 from contextlib import contextmanager
 from dataclasses import dataclass
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from pathlib import Path
-from typing import Any, Iterator
+from typing import Any
 
 from . import config
 
@@ -125,7 +126,9 @@ def load_assets() -> FilterAssets:
     if not bg_names or not fg_names:
         raise PipelineError("Keine gueltigen Filter in background/foreground Listen")
 
-    return FilterAssets(background_names=bg_names, foreground_names=fg_names, blend_modes=blend_modes, commands=commands)
+    return FilterAssets(
+        background_names=bg_names, foreground_names=fg_names, blend_modes=blend_modes, commands=commands
+    )
 
 
 def run_gmic(args: list[str], output_image: Path) -> tuple[bool, str, float]:
@@ -167,7 +170,9 @@ def apply_filter(image: Path, full_command: str, output_image: Path) -> tuple[bo
     return ok, err
 
 
-def apply_filter_chain(image: Path, commands: tuple[str, ...], output_image: Path, tmp_dir: Path, prefix: str) -> tuple[bool, str]:
+def apply_filter_chain(
+    image: Path, commands: tuple[str, ...], output_image: Path, tmp_dir: Path, prefix: str
+) -> tuple[bool, str]:
     current = image
     for i, command in enumerate(commands):
         target = output_image if i == len(commands) - 1 else tmp_dir / f"{prefix}_post_{i}.png"
@@ -178,11 +183,6 @@ def apply_filter_chain(image: Path, commands: tuple[str, ...], output_image: Pat
     return True, ""
 
 
-def blend_layers(base: Path, overlay: Path, mode: str, output_image: Path) -> tuple[bool, str]:
-    ok, err, _ = run_gmic([str(base), str(overlay), "blend", f"{mode},{config.BLEND_OPACITY}"], output_image)
-    return ok, err
-
-
 def blend_layers_opacity(base: Path, overlay: Path, mode: str, opacity: str, output_image: Path) -> tuple[bool, str]:
     ok, err, _ = run_gmic([str(base), str(overlay), "blend", f"{mode},{opacity}"], output_image)
     return ok, err
@@ -297,7 +297,7 @@ def pick_working_filter(
 
 
 def now_iso() -> str:
-    return datetime.now(timezone.utc).isoformat(timespec="seconds")
+    return datetime.now(UTC).isoformat(timespec="seconds")
 
 
 _UNSAFE_STEM_RE = re.compile(r"[^\w.\-]+", re.UNICODE)
@@ -483,14 +483,18 @@ def compose_variant(
         if not bg_command:
             raise PipelineError(f"Unbekannter Background-Filter: {bg_name}")
     else:
-        bg_name, bg_command = pick_working_filter(assets.background_names, assets.commands, paths.original, tmp_dir, "bg", rng)
+        bg_name, bg_command = pick_working_filter(
+            assets.background_names, assets.commands, paths.original, tmp_dir, "bg", rng
+        )
 
     if fg_name:
         fg_command = assets.commands.get(fg_name)
         if not fg_command:
             raise PipelineError(f"Unbekannter Foreground-Filter: {fg_name}")
     else:
-        fg_name, fg_command = pick_working_filter(assets.foreground_names, assets.commands, paths.rembg, tmp_dir, "fg", rng)
+        fg_name, fg_command = pick_working_filter(
+            assets.foreground_names, assets.commands, paths.rembg, tmp_dir, "fg", rng
+        )
 
     p = {
         "bg_filtered": tmp_dir / f"{prefix}_bg_filtered.png",
diff --git a/app/worker.py b/app/worker.py
index 38ec362..d4176b5 100644
--- a/app/worker.py
+++ b/app/worker.py
@@ -70,9 +70,7 @@ def _is_ignored_name(name: str) -> bool:
     """Skip Syncthing metadata/temp files and other dotfiles."""
     if name.startswith("."):
         return True
-    if name.startswith(".syncthing.") or ".syncthing." in name:
-        return True
-    return False
+    return bool(name.startswith(".syncthing.") or ".syncthing." in name)
 
 
 def _is_stable(path: Path) -> bool: