code: def downgrade():
      try:
          op.drop_column("dbs", "verbose_name")
          op.drop_column("clusters", "verbose_name")
      except Exception as ex:
          logging.exception(ex)
  
imports: import logging
  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