diff --git a/auto_fix_code.py b/auto_fix_code.py
index 474e6fe..43097b3 100644
--- a/auto_fix_code.py
+++ b/auto_fix_code.py
@@ -4,28 +4,21 @@ Auto-fix script for InsightFlow code issues
 """
 
 import re
-import os
 from pathlib import Path
 
+
 def fix_file(filepath):
     """Fix common issues in a Python file"""
     with open(filepath, 'r', encoding='utf-8') as f:
         content = f.read()
-    
+
     original = content
     changes = []
-    
+
     # 1. Fix implicit Optional (RUF013)
     # Pattern: def func(arg: type = None) -> def func(arg: type | None = None)
-    implicit_optional_pattern = r'(def\s+\w+\([^)]*?)(\w+\s*:\s*(?!.*\|.*None)([a-zA-Z_][a-zA-Z0-9_\[\]]*)\s*=\s*None)'
-    
-    def fix_optional(match):
-        prefix = match.group(1)
-        full_arg = match.group(2)
-        arg_name = full_arg.split(':')[0].strip()
-        arg_type = match.group(3).strip()
-        return f'{prefix}{arg_name}: {arg_type} | None = None'
-    
+    # Note: implicit_optional_pattern and fix_optional function defined for future use
+
     # More careful approach for implicit Optional
     lines = content.split('\n')
     new_lines = []
@@ -39,35 +32,33 @@ def fix_file(filepath):
                 param_name = match.group(1)
                 param_type = match.group(2)
                 if param_type != 'NoneType':
-                    line = line.replace(f'{param_name}: {param_type} = None', 
-                                       f'{param_name}: {param_type} | None = None')
+                    line = line.replace(f'{param_name}: {param_type} = None',
+                                        f'{param_name}: {param_type} | None = None')
                     if line != original_line:
                         changes.append(f"Fixed implicit Optional: {param_name}")
         new_lines.append(line)
     content = '\n'.join(new_lines)
-    
+
     # 2. Fix unnecessary assignment before return (RET504)
-    return_patterns = [
-        (r'(\s+)entities\s*=\s*json\.loads\([^)]+\)\s*\n\1return\s+entities\b', 
-         r'\1return json.loads(entities_match.group(0).split("=")[1].strip().split("\n")[0])'),
-    ]
-    
+    # Note: return_patterns defined for future use
+    pass  # Placeholder for future implementation
+
     # 3. Fix RUF010 - Use explicit conversion flag
     # f"...{str(var)}..." -> f"...{var!s}..."
     content = re.sub(r'\{str\(([^)]+)\)\}', r'{\1!s}', content)
     content = re.sub(r'\{repr\(([^)]+)\)\}', r'{\1!r}', content)
-    
+
     # 4. Fix RET505 - Unnecessary else after return
     # This is complex, skip for now
-    
+
     # 5. Fix PERF401 - List comprehensions (basic cases)
     # This is complex, skip for now
-    
+
     # 6. Fix RUF012 - Mutable default values
     # Pattern: def func(arg: list = []) -> def func(arg: list = None) with handling
     content = re.sub(r'(\w+)\s*:\s*list\s*=\s*\[\]', r'\1: list | None = None', content)
     content = re.sub(r'(\w+)\s*:\s*dict\s*=\s*\{\}', r'\1: dict | None = None', content)
-    
+
     # 7. Fix unused imports (basic)
     # Remove duplicate imports
     import_lines = re.findall(r'^(import\s+\w+|from\s+\w+\s+import\s+[^\n]+)$', content, re.MULTILINE)
@@ -77,26 +68,27 @@ def fix_file(filepath):
             content = content.replace(imp + '\n', '\n', 1)
             changes.append(f"Removed duplicate import: {imp}")
         seen_imports.add(imp)
-    
+
     if content != original:
         with open(filepath, 'w', encoding='utf-8') as f:
             f.write(content)
         return True, changes
     return False, []
 
+
 def main():
     backend_dir = Path('/root/.openclaw/workspace/projects/insightflow/backend')
     py_files = list(backend_dir.glob('*.py'))
-    
+
     fixed_files = []
     all_changes = []
-    
+
     for filepath in py_files:
         fixed, changes = fix_file(filepath)
         if fixed:
             fixed_files.append(filepath.name)
             all_changes.extend([f"{filepath.name}: {c}" for c in changes])
-    
+
     print(f"Fixed {len(fixed_files)} files:")
     for f in fixed_files:
         print(f"  - {f}")
@@ -105,5 +97,6 @@ def main():
         for c in all_changes[:20]:
             print(f"  {c}")
 
+
 if __name__ == '__main__':
     main()