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diff --git a/backend/__pycache__/tingwu_client.cpython-312.pyc b/backend/__pycache__/tingwu_client.cpython-312.pyc
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diff --git a/backend/__pycache__/workflow_manager.cpython-312.pyc b/backend/__pycache__/workflow_manager.cpython-312.pyc
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diff --git a/backend/main.py b/backend/main.py
index afb6d5d..f3e6160 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -2381,8 +2381,6 @@ async def create_attribute_template_endpoint(
     if not DB_AVAILABLE:
         raise HTTPException(status_code=500, detail="Database not available")
 
-    from db_manager import AttributeTemplate
-
     db = get_db_manager()
     project = db.get_project(project_id)
     if not project:
@@ -2602,8 +2600,6 @@ async def batch_set_entity_attributes_endpoint(
     if not DB_AVAILABLE:
         raise HTTPException(status_code=500, detail="Database not available")
 
-    from db_manager import EntityAttribute
-
     db = get_db_manager()
     entity = db.get_entity(entity_id)
     if not entity:
@@ -8667,8 +8663,6 @@ async def get_branding_css(tenant_id: str):
     manager = get_tenant_manager()
     css = manager.get_branding_css(tenant_id)
 
-    from fastapi.responses import PlainTextResponse
-
     return PlainTextResponse(content=css, media_type="text/css")
 
 
diff --git a/backend/security_manager.py b/backend/security_manager.py
index 600d763..d916a25 100644
--- a/backend/security_manager.py
+++ b/backend/security_manager.py
@@ -196,7 +196,6 @@ class SecurityManager:
     }
 
     def __init__(self, db_path: str = "insightflow.db"):
-        self.db_path = db_path
         self.db_path = db_path
         # 预编译正则缓存
         self._compiled_patterns: dict[str, re.Pattern] = {}