Re: [PR] Reduce API server memory usage by eliminating `SerializedDAG` loads on task start [airflow]

["amoghrajesh (via GitHub)" <gi...@apache.org>]

amoghrajesh commented on code in PR #60803:
URL: https://github.com/apache/airflow/pull/60803#discussion_r2706826495


##########
airflow-core/src/airflow/api_fastapi/execution_api/versions/v2026_03_31.py:
##########
@@ -33,3 +33,20 @@ class ModifyDeferredTaskKwargsToJsonValue(VersionChange):
         schema(TIDeferredStatePayload).field("trigger_kwargs").had(type=dict[str, Any] | str),
         schema(TIDeferredStatePayload).field("next_kwargs").had(type=dict[str, Any]),
     )
+
+
+class RemoveUpstreamMapIndexesField(VersionChange):
+    """Remove upstream_map_indexes field from TIRunContext - now computed by Task SDK."""
+
+    description = __doc__
+
+    instructions_to_migrate_to_previous_version = (
+        schema(TIRunContext)
+        .field("upstream_map_indexes")
+        .existed_as(type=dict[str, int | list[int] | None] | None),
+    )
+
+    @convert_response_to_previous_version_for(TIRunContext)  # type: ignore[arg-type]
+    def add_upstream_map_indexes_field(response: ResponseInfo) -> None:  # type: ignore[misc]

Review Comment:
   ```suggestion
       def add_empty_upstream_map_indexes_to_response(response: ResponseInfo) -> None:  # type: ignore[misc]
   ```



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