code: def downgrade():
      """Unapply Add description field to ``Variable`` model"""
      with op.batch_alter_table("variable", schema=None) as batch_op:
          batch_op.drop_column("description")
  
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