code: def downgrade():
      with op.batch_alter_table("logs") as batch_op:
          batch_op.add_column(
              sa.Column("dt", sa.Date, default=date.today())
          )
  
imports: from datetime import date
  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