code: def downgrade():
      
      # Remove 'created' and 'updated' columns
      op.drop_column('oauthclient_remoteaccount', 'created')
      op.drop_column('oauthclient_remoteaccount', 'updated')
  
      op.drop_column('oauthclient_remotetoken', 'created')
      op.drop_column('oauthclient_remotetoken', 'updated')
  
      op.drop_column('oauthclient_useridentity', 'created')
      op.drop_column('oauthclient_useridentity', 'updated')
docs: Downgrade database.