[AAP-86051] Document serializer persistence context for bulk bypass dedupe

Point bulk host/job launch create() and workflow bulk audit at DAB
validation_bypass_observability guidance for is_valid() + audit_bulk_*.

Co-authored-by: Cursor <cursoragent@cursor.com>

awx/api/serializers.py

@@ -2274,6 +2274,7 @@ class BulkHostCreateSerializer(serializers.Serializer):
         return attrs
 
     def create(self, validated_data):
+        # DAB: dedupe Validation rejected (child BulkHostSerializer is_valid) vs ORM bypass bulk_create.
         with serializer_mediated_persistence_context():
             return self._create_bulk_hosts(validated_data)
 
@@ -5282,6 +5283,7 @@ class BulkJobLaunchSerializer(PromptFieldCleanTextMixin, serializers.Serializer)
             )
 
     def create(self, validated_data):
+        # DAB: dedupe Validation rejected (is_valid) vs audit_workflow_job_nodes / bulk_create bypass logs.
         with serializer_mediated_persistence_context():
             return self._create_bulk_job_launch(validated_data)
 

awx/main/utils/validation_bypass_observability.py

@@ -61,6 +61,11 @@ def audit_workflow_job_nodes_for_bulk_create(nodes: Iterable[Model]) -> None:
     columns. Node prompt values (limit, job_tags, etc.) live in ``char_prompts`` via
     ``NullablePromptPseudoField`` and must be read with ``getattr`` after deferred
     attrs are applied on the in-memory instances.
+
+    When called from a DRF ``create()`` after ``is_valid()``, the caller must run
+    inside DAB ``serializer_mediated_persistence_context`` so duplicate
+    ``Validation rejected`` / ``ORM bypass`` lines are not emitted (see DAB
+    ``docs/lib/validation_bypass_observability.md``).
     """
     materialized = list(nodes)
     if not materialized: