Fixing this

server.py

@@ -167,15 +167,14 @@ def extract_patient_name(raw_name):
     name_only = raw_name.split('DOB')[0].strip()
     return re.sub(r'[:\d\-\s]+$', '', name_only).strip()
 
-def read_file_content(file_info):
-    """Decodes file content from Base64, trying UTF-8 then Latin-1."""
-    b64_content = file_info.get('content')
-    raw_bytes = base64.b64decode(b64_content)
+def read_file_with_fallback_encoding(file_storage, filename):
+    """Reads a file Storage object, trying UTF-8 then Latin-1."""
     try:
-        return raw_bytes.decode('utf-8')
+        return pd.read_excel(file_storage) if filename.endswith('.xlsx') else pd.read_csv(file_storage, engine='python', on_bad_lines='warn')
     except UnicodeDecodeError:
-        print(f"[Server Log] UTF-8 decoding failed for {file_info.get('name')}, falling back to Latin-1.")
-        return raw_bytes.decode('latin-1')
+        print(f"[Server Log] UTF-8 reading failed for {filename}. Retrying with Latin-1.")
+        file_storage.seek(0) # Reset file pointer
+        return pd.read_csv(file_storage, engine='python', on_bad_lines='warn', encoding='latin-1')
 
 @socketio.on('connect')
 def handle_connect():
@@ -192,8 +191,11 @@ def handle_init_and_process(data):
             'start_date': data.get('start_date'), 'end_date': data.get('end_date')
         }
 
-        app_data_content = read_file_content(data.get('app_data_file'))
-        quantum_data_content = read_file_content(data.get('quantum_data_file'))
+        app_data_file_info = data.get('app_data_file')
+        quantum_data_file_info = data.get('quantum_data_file')
+
+        app_data_content = read_file_content(app_data_file_info)
+        quantum_data_content = read_file_content(quantum_data_file_info)
         
         df_app = pd.read_csv(io.StringIO(app_data_content))
         df_quantum = pd.read_csv(io.StringIO(quantum_data_content))