Update workflow creation date to respect process_started_after_created constraint

arkindex/process/migrations/0005_migrate_workflows.py

@@ -14,6 +14,19 @@ class Migration(migrations.Migration):
     operations = [
         migrations.RunSQL(
             [
+                # In some rare cases, the workflow creation date is set a few milliseconds
+                # before the process creation date, breaking the process_started_after_created constraint
+                """
+                update ponos_workflow w
+                set created = data.created
+                from (
+                    select w.id, p.created
+                    from process_process p
+                    inner join ponos_workflow w on (w.id=p.workflow_id)
+                    where w.created < p.created
+                ) data
+                where data.id=w.id;
+                """,
                 # This query cannot be done with QuerySet.update, because Django does not allow joining during an update.
                 # This is why we use RunSQL here and not RunPython.
                 """