fix(dashboards): normalize naive/aware datetimes in resource task ordering

backend/src/services/resource_service.py

@@ -10,7 +10,7 @@
 
 # [SECTION: IMPORTS]
 from typing import List, Dict, Optional, Any
-from datetime import datetime
+from datetime import datetime, timezone
 from ..core.superset_client import SupersetClient
 from ..core.task_manager.models import Task
 from ..services.git_service import GitService
@@ -179,12 +179,12 @@ class ResourceService:
             return None
 
         def _task_time(task_obj: Any) -> datetime:
-            return (
+            raw_time = (
                 getattr(task_obj, "started_at", None)
                 or getattr(task_obj, "finished_at", None)
                 or getattr(task_obj, "created_at", None)
-                or datetime.min
             )
+            return self._normalize_datetime_for_compare(raw_time)
 
         last_task = max(matched_tasks, key=_task_time)
         raw_result = getattr(last_task, "result", None)
@@ -229,6 +229,20 @@ class ResourceService:
             return status_text
         return "UNKNOWN"
     # [/DEF:_normalize_validation_status:Function]
+
+    # [DEF:_normalize_datetime_for_compare:Function]
+    # @PURPOSE: Normalize datetime values to UTC-aware values for safe comparisons.
+    # @PRE: value may be datetime or any scalar.
+    # @POST: Returns UTC-aware datetime; non-datetime values map to minimal UTC datetime.
+    # @PARAM: value (Any) - Candidate datetime-like value.
+    # @RETURN: datetime - UTC-aware comparable datetime.
+    def _normalize_datetime_for_compare(self, value: Any) -> datetime:
+        if isinstance(value, datetime):
+            if value.tzinfo is None:
+                return value.replace(tzinfo=timezone.utc)
+            return value.astimezone(timezone.utc)
+        return datetime.min.replace(tzinfo=timezone.utc)
+    # [/DEF:_normalize_datetime_for_compare:Function]
     
     # [DEF:get_datasets_with_status:Function]
     # @PURPOSE: Fetch datasets from environment with mapping progress and last task status
@@ -391,8 +405,11 @@ class ResourceService:
         if not resource_tasks:
             return None
         
-        # Get most recent task
-        last_task = max(resource_tasks, key=lambda t: t.created_at)
+        # Get most recent task with timezone-safe comparison.
+        last_task = max(
+            resource_tasks,
+            key=lambda t: self._normalize_datetime_for_compare(getattr(t, "created_at", None)),
+        )
         
         return {
             'task_id': str(last_task.id),