chore: improve clear workflow_run task (#31124)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: hj24 <mambahj24@gmail.com>

api/models/workflow.py

@@ -781,11 +781,7 @@ class WorkflowNodeExecutionModel(Base):  # This model is expected to have `offlo
         return (
             PrimaryKeyConstraint("id", name="workflow_node_execution_pkey"),
             Index(
-                "workflow_node_execution_workflow_run_idx",
-                "tenant_id",
-                "app_id",
-                "workflow_id",
-                "triggered_from",
+                "workflow_node_execution_workflow_run_id_idx",
                 "workflow_run_id",
             ),
             Index(