diff --git a/src/database.py b/src/database.py
index b9e8cf2..0ec0917 100644
--- a/src/database.py
+++ b/src/database.py
@@ -1,6 +1,5 @@
 """Datenbankverbindung (geteilte DB mit OSINT-Monitor)."""
 import aiosqlite
-import os
 from config import DB_PATH
 
 
diff --git a/src/models.py b/src/models.py
index dc1acb4..17c3345 100644
--- a/src/models.py
+++ b/src/models.py
@@ -1,5 +1,5 @@
 """Pydantic Models für das Verwaltungsportal."""
-from pydantic import BaseModel, EmailStr, Field
+from pydantic import BaseModel, Field
 from typing import Optional
 
 
diff --git a/src/routers/audit.py b/src/routers/audit.py
index a8582c5..d7ed9f4 100644
--- a/src/routers/audit.py
+++ b/src/routers/audit.py
@@ -2,7 +2,7 @@
 import json
 import logging
 from typing import Optional
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends
 from auth import get_current_admin
 from database import db_dependency
 import aiosqlite
diff --git a/src/routers/auth.py b/src/routers/auth.py
index 09e8457..06e79b2 100644
--- a/src/routers/auth.py
+++ b/src/routers/auth.py
@@ -1,7 +1,7 @@
 """Magic-Link-Authentifizierung."""
 import logging
 from datetime import datetime, timedelta, timezone
-from fastapi import APIRouter, Depends, HTTPException, Request, status
+from fastapi import APIRouter, Depends, HTTPException, Request
 import aiosqlite
 
 from auth import generate_magic_token, create_token
diff --git a/src/routers/sources.py b/src/routers/sources.py
index dea28ed..3974de4 100644
--- a/src/routers/sources.py
+++ b/src/routers/sources.py
@@ -2,7 +2,7 @@
 import logging
 import uuid
 
-from fastapi import APIRouter, Depends, HTTPException, status, Request
+from fastapi import APIRouter, Depends, HTTPException, Request
 from fastapi.responses import StreamingResponse
 from pydantic import BaseModel, Field
 from typing import Optional
@@ -10,15 +10,13 @@ import aiosqlite
 
 from auth import get_current_admin
 from database import db_dependency
-from audit import log_action, get_client_ip, row_to_dict
+from audit import log_action, get_client_ip
 from source_meta import get_meta
 from config import HEALTH_CHECK_USER_AGENT, HEALTH_CHECK_TIMEOUT_S
 from shared.source_rules import (
     discover_source,
     discover_all_feeds,
     evaluate_feeds_with_claude,
-    _extract_domain,
-    _detect_category,
     domain_to_display_name,
 )
 
@@ -683,7 +681,7 @@ async def update_suggestion(
             new_url = data.get("url")
             if source_id and new_url:
                 await db.execute("UPDATE sources SET url = ? WHERE id = ?", (new_url, source_id))
-                result_action = f"URL aktualisiert"
+                result_action = "URL aktualisiert"
 
         # Auto-Reject: Wenn fix_url oder add_source akzeptiert wird,
         # zugehörige deactivate_source-Vorschläge automatisch ablehnen
@@ -741,7 +739,6 @@ async def run_health_check_stream(
     """Health-Check mit Fortschrittsanzeige (SSE-Stream)."""
     import json as _json
     import asyncio
-    from urllib.parse import urlparse
 
     # Quellen laden
     cursor = await db.execute(
@@ -806,8 +803,8 @@ async def run_health_check_stream(
                                             "message": f"Feed OK ({len(feed.entries)} Eintr.)"})
                     except httpx.TimeoutException:
                         checks.append({"type": "reachability", "status": "error", "message": "Timeout (15s)"})
-                    except httpx.ConnectError as e:
-                        checks.append({"type": "reachability", "status": "error", "message": f"Verbindung fehlgeschlagen"})
+                    except httpx.ConnectError:
+                        checks.append({"type": "reachability", "status": "error", "message": "Verbindung fehlgeschlagen"})
                     except Exception as e:
                         checks.append({"type": "reachability", "status": "error", "message": f"{type(e).__name__}"})
 
diff --git a/src/routers/users.py b/src/routers/users.py
index 6dab904..50f1fcc 100644
--- a/src/routers/users.py
+++ b/src/routers/users.py
@@ -7,7 +7,7 @@ from models import UserCreate, UserResponse
 from auth import get_current_admin
 from database import db_dependency
 from audit import log_action, get_client_ip, row_to_dict
-from config import MAGIC_LINK_BASE_URL, MAGIC_LINK_EXPIRE_MINUTES
+from config import MAGIC_LINK_BASE_URL
 import aiosqlite
 
 router = APIRouter(prefix="/api/users", tags=["users"])