diff --git a/html_data_format/webserver.py b/html_data_format/webserver.py
index 69051ef..30100ef 100644
--- a/html_data_format/webserver.py
+++ b/html_data_format/webserver.py
@@ -1,14 +1,16 @@
-import json
 import datetime
+import json
 import logging
 from pathlib import Path
 
-from bottle import route, run, request, response
+from bottle import request, response, route, run
+
 from personal_data.csv_import import load_csv_file
 
-logger = logging.getLogger("webserver")
+logger = logging.getLogger('webserver')
 logger.setLevel(logging.INFO)
 
+
 def parse_time(time_str: str) -> datetime.datetime:
     """
     Parse a time string assuming ISO-8601 format.
@@ -16,35 +18,37 @@ def parse_time(time_str: str) -> datetime.datetime:
     """
     return datetime.datetime.fromisoformat(time_str)
 
+
 @route('/newest')
 def newest_entry():
     """
     Loads a CSV file (default: data.csv, overridable by query param 'file'),
     finds the newest entry based on the 'time.current' column, and returns it as JSON.
     """
-    file_param = request.query.get("file", "data.csv")
+    file_param = request.query.get('file', 'data.csv')
     csv_path = Path(file_param)
-    
+
     try:
         data = load_csv_file(csv_path)
     except Exception as e:
-        logger.error(f"Error loading CSV file at {csv_path}: {e}")
+        logger.error(f'Error loading CSV file at {csv_path}: {e}')
         response.status = 500
-        return {"error": f"Failed to load CSV: {str(e)}"}
-    
+        return {'error': f'Failed to load CSV: {str(e)}'}
+
     if not data:
         response.status = 404
-        return {"error": "CSV file is empty or no data found"}
-    
+        return {'error': 'CSV file is empty or no data found'}
+
     try:
         newest = max(data, key=lambda r: parse_time(r['time.current']))
     except Exception as e:
-        logger.error(f"Error processing CSV data: {e}")
+        logger.error(f'Error processing CSV data: {e}')
         response.status = 500
-        return {"error": f"Failed to process CSV data: {str(e)}"}
-    
-    response.content_type = "application/json"
+        return {'error': f'Failed to process CSV data: {str(e)}'}
+
+    response.content_type = 'application/json'
     return json.dumps(newest)
 
+
 if __name__ == '__main__':
     run(host='localhost', port=8080, debug=True)