Update insight_and_tasks/data_models/metrics.py

insight_and_tasks/data_models/metrics.py

@@ -1,6 +1,6 @@
 # data_models/metrics.py
 from dataclasses import dataclass, field
-from typing import List, Dict, Any, Literal
+from typing import List, Dict, Any, Literal, Optional
 
 # Define literal types for more specific type hinting
 MetricType = Literal['time_series', 'aggregate', 'categorical']