diff --git a/src/core/dependencies.py b/src/core/dependencies.py
index f0cc814..8ecc3dd 100644
--- a/src/core/dependencies.py
+++ b/src/core/dependencies.py
@@ -395,18 +395,6 @@ def get_rag_search_service() -> "RAGSearchService":
     )
 
 
-# Utility: Get default user from settings or multi_tenancy
-def get_default_user() -> str:
-    """
-    Get default user for operations.
-
-    Returns:
-        Default user identifier
-    """
-    from src.core.multi_tenancy import DEFAULT_USER
-    return DEFAULT_USER
-
-
 # Authentication
 from fastapi import Security, HTTPException
 from fastapi.security import HTTPBearer
diff --git a/src/routers/graph.py b/src/routers/graph.py
index 8b92a92..a6d3db0 100644
--- a/src/routers/graph.py
+++ b/src/routers/graph.py
@@ -15,8 +15,6 @@ from src.models.graph import (
     MindMapResponse
 )
 from src.services.graph_service import GraphService
-from src.clients.neo4j_client import Neo4jClient
-from src.clients.wikijs_client import WikiJSClient
 from src.core.dependencies import Neo4jDep, WikiJSDep, verify_api_key
 from src.core.multi_tenancy import DEFAULT_USER
 
diff --git a/src/routers/hybrid_rag.py b/src/routers/hybrid_rag.py
index adc2936..82f0fa3 100644
--- a/src/routers/hybrid_rag.py
+++ b/src/routers/hybrid_rag.py
@@ -10,10 +10,6 @@ import logging
 
 from src.models.hybrid_rag import HybridRAGRequest, HybridRAGResponse
 from src.services.hybrid_rag_service import HybridRAGService
-from src.services.vector_service import VectorService
-from src.services.graph_service import GraphService
-from src.clients.searxng_client import SearXNGClient
-from src.clients.ollama_client import OllamaClient
 from src.core.dependencies import (
     Neo4jDep, WikiJSDep, QdrantDep, OllamaDep,
     SearXNGDep, ContentExtractorDep, verify_api_key, get_settings
diff --git a/src/routers/wiki.py b/src/routers/wiki.py
index d84b71f..efefd63 100644
--- a/src/routers/wiki.py
+++ b/src/routers/wiki.py
@@ -5,8 +5,7 @@ Endpoints for wiki page and dossier management.
 All operations are scoped to user namespaces for multi-tenancy.
 """
 
-from fastapi import APIRouter, HTTPException, Depends, Query, Security, BackgroundTasks
-from fastapi.security import HTTPAuthorizationCredentials
+from fastapi import APIRouter, HTTPException, Depends, Query, BackgroundTasks
 from typing import Optional
 import logging