code: def downgrade_metadata_v2_to_v1():
      return [
          drop(["verify_key", "node_type"]),
      ]
  
file_path: PySyft/packages/syft/src/syft/service/settings/migrations.py
imports: from typing import Callable
  from ...types.syft_migration import migrate
  from ...types.transforms import TransformContext
  from ...types.transforms import drop
  from .settings import NodeSettings
  from .settings import NodeSettingsV2
label_desc: Use image node_id 3 for calling a global function with example usage: downgrade_metadata_v2_to_v1() and returns: list