pierrejeambrun commented on code in PR #46390:
URL: https://github.com/apache/airflow/pull/46390#discussion_r1943187402


##########
airflow/api_fastapi/core_api/routes/public/dag_run.py:
##########
@@ -362,16 +362,19 @@ def trigger_dag_run(
                 end=pendulum.instance(body.data_interval_end),
             )
         else:
-            data_interval = 
dag.timetable.infer_manual_data_interval(run_after=logical_date)
+            data_interval = dag.timetable.infer_manual_data_interval(
+                run_after=logical_date or pendulum.now("UTC")

Review Comment:
   I think we should have only one `pendulum.now("UTC")` so it's easy to 
identify that all of those were automatically filled with `now`. Here we will 
have multiple different `now` values. 



##########
airflow/api_fastapi/core_api/routes/public/dag_run.py:
##########
@@ -362,16 +362,19 @@ def trigger_dag_run(
                 end=pendulum.instance(body.data_interval_end),
             )
         else:
-            data_interval = 
dag.timetable.infer_manual_data_interval(run_after=logical_date)
+            data_interval = dag.timetable.infer_manual_data_interval(
+                run_after=logical_date or pendulum.now("UTC")
+            )
 
-        if body.dag_run_id:
-            run_id = body.dag_run_id
-        else:
-            run_id = dag.timetable.generate_run_id(
+        run_id = (
+            body.dag_run_id
+            if body.dag_run_id
+            else dag.timetable.generate_run_id(

Review Comment:
   I don't think `body.dag_run_id` can ever be none. It's automatically 
validated and provided a value if `if not self.dag_run_id:` via 
`DagRun.generate_run_id(`



##########
airflow/models/backfill.py:
##########
@@ -141,6 +140,7 @@ class BackfillDagRunExceptionReason(str, Enum):
     IN_FLIGHT = "in flight"
     ALREADY_EXISTS = "already exists"
     UNKNOWN = "unknown"
+    CLEARED_RUN = "cleared existing run"

Review Comment:
   Not sure I understand this addition as part of the PR.



##########
airflow/migrations/versions/0032_3_0_0_rename_execution_date_to_logical_date_and_nullable.py:
##########
@@ -17,9 +17,9 @@
 # under the License.
 
 """
-Drop ``execution_date`` unique constraint on DagRun.
+Make logical_date nullable.

Review Comment:
   Editing a migration will not re-run anything for people using breeze. (They 
might run into silent errors until they clean their db and re-run migration 
from scratch). 
   
   That's not a big deal but we might want to drop a message in the contributor 
channel.



##########
airflow/models/backfill.py:
##########
@@ -262,7 +266,23 @@ def _create_backfill_dag_run(
     dag_run_conf,
     backfill_sort_ordinal,
     session,
+    from_date,
+    to_date,
 ):
+    from airflow.models import DAG

Review Comment:
   I assume non local import creates a cyclic import ?



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