Add rate limiting support to API keys

app.py

@@ -171,6 +171,10 @@ async def execute_http_function(user_id, function):
                 api_key = db.get_api_key(api_key_value)
                 
                 if api_key and api_key['user_id'] == user_id:
+                    # Check rate limit
+                    if not db.check_and_increment_api_key_usage(api_key['id']):
+                        return jsonify({'error': 'Rate limit exceeded'}), 429
+
                     # Check Scopes
                     scopes = api_key['scopes']
                     if isinstance(scopes, str):