code: def downgrade():
      # Omit downgrade logic for now - we don't currently provide users a command/API for
      # reverting a database migration, instead recommending that they take a database backup
      # before running the migration.
      pass
  
file_path: mlflow/mlflow/store/db_migrations/versions/cfd24bdc0731_update_run_status_constraint_with_killed.py
imports: import alembic
  from alembic import op
  from packaging.version import Version
  from sqlalchemy import CheckConstraint, Enum
  from mlflow.entities import RunStatus, ViewType
  from mlflow.entities.lifecycle_stage import LifecycleStage
  from mlflow.store.tracking.dbmodels.models import SqlRun, SourceTypes
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types