code: def downgrade():
      """Unapply Add processor_subdir to ImportError."""
      conn = op.get_bind()
      with op.batch_alter_table(
          "import_error", schema=None
      ) as batch_op:
          batch_op.drop_column("processor_subdir")
  
imports: 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