vatsrahul1001 commented on code in PR #45731:
URL: https://github.com/apache/airflow/pull/45731#discussion_r1924721037


##########
airflow/models/backfill.py:
##########
@@ -75,6 +75,22 @@ class DagNoScheduleException(AirflowException):
     """
 
 
+class InvalidBackfillDirection(AirflowException):
+    """
+    Raised when backfill is attempted in reverse order with tasks that depend 
on past runs.
+
+    :meta private:
+    """
+
+
+class InvalidReprocessBehavior(AirflowException):
+    """
+    Raised when a backfill cannot be completed because the reprocess behavior 
is not valid.
+
+    :meta private:
+    """

Review Comment:
   Implemented this 
https://github.com/apache/airflow/pull/45731#discussion_r1924092898



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