code: def downgrade():
      """Remove is_orphaned from DatasetModel"""
      with op.batch_alter_table("dataset") as batch_op:
          batch_op.drop_column("is_orphaned", mssql_drop_default=True)
  
imports: from __future__ import annotations
  import sqlalchemy
  from alembic import op
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types