Update services/report_data_handler.py

services/report_data_handler.py

@@ -223,6 +223,7 @@ def save_key_results(
                 data_subject_value = kr.get("data_subject")
 
                 metrics_for_kr = _get_metrics_for_subject(data_subject_value, metrics)
+                metrics_as_string = json.dumps(metrics_for_kr) if metrics_for_kr else None
                 
                 key_result_payloads.append({
                     "okr": parent_objective_id,
@@ -232,7 +233,7 @@ def save_key_results(
                     # FIX: Convert Enum to its value before sending.
                     "kr_type": kr_type.value if hasattr(kr_type, 'value') else kr_type,
                     "data_subject": kr.get("data_subject"),
-                    "metriche_data_subject": metrics_for_kr
+                    "metriche_data_subject": metrics_as_string
                 })
 
         if not key_result_payloads: