refactor: enhance JSON serialization in AuditLog service

backend/api/v1/modules/a76/audit_log/services/service.py

@@ -1,7 +1,9 @@
 """
 Audit Log Service
 """
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, date, time
+from decimal import Decimal
+import uuid
 import pytz
 from typing import Optional, List, Dict, Any
 from sqlalchemy.orm import Session
@@ -11,6 +13,29 @@ from core.security import verify_token # keep if needed or simpler just remove i
 # We don't need security import here anymore as context is passed explicitly or handled by events
 
 
+def _make_json_safe(obj: Any) -> Any:
+    """Recursively convert non-JSON-serializable types to serializable equivalents."""
+    if obj is None:
+        return None
+    if isinstance(obj, dict):
+        return {k: _make_json_safe(v) for k, v in obj.items()}
+    if isinstance(obj, (list, tuple)):
+        return [_make_json_safe(v) for v in obj]
+    if isinstance(obj, datetime):
+        return obj.isoformat()
+    if isinstance(obj, date):
+        return obj.isoformat()
+    if isinstance(obj, time):
+        return obj.isoformat()
+    if isinstance(obj, Decimal):
+        return float(obj)
+    if isinstance(obj, uuid.UUID):
+        return str(obj)
+    if isinstance(obj, bytes):
+        return obj.decode("utf-8", errors="replace")
+    return obj
+
+
 class AuditService:
     
     @staticmethod
@@ -56,8 +81,8 @@ class AuditService:
             table_name=table_name,
             record_id=record_id,
             operation_type=operation_type,
-            old_values=old_values,
-            new_values=new_values,
+            old_values=_make_json_safe(old_values),
+            new_values=_make_json_safe(new_values),
             changed_fields=changed_fields,
             ip_address=ip_address,
             user_agent=user_agent,