fix(awooop): sort mixed run timeline timestamps

apps/api/src/services/platform_operator_service.py

@@ -341,6 +341,14 @@ def _remediation_timeline_summary(item: dict[str, Any]) -> str:
     )[:500]
 
 
+def _timeline_sort_key(item: dict[str, Any], fallback_ts: Any) -> str:
+    """Normalize mixed DB datetime / ISO string timestamps for timeline sorting."""
+    value = item.get("ts") or fallback_ts
+    if hasattr(value, "isoformat"):
+        return value.isoformat()
+    return str(value or "")
+
+
 def _summarize_run_remediation_by_work_item(
     items: list[dict[str, Any]],
 ) -> list[dict[str, Any]]:
@@ -700,7 +708,7 @@ async def get_run_detail(
 
     timeline = sorted(
         timeline,
-        key=lambda item: item["ts"] or run.created_at,
+        key=lambda item: _timeline_sort_key(item, run.created_at),
     )[:_MAX_TIMELINE_ITEMS]
 
     return {