code: def upgrade():
      
      current_date = datetime.utcnow()
  
      # Add 'created' and 'updated' columns to RemoteAccount
      _add_created_updated_columns('oauthclient_remoteaccount', current_date)
  
      # Add 'created' and 'updated' columns to RemoteToken
      _add_created_updated_columns('oauthclient_remotetoken', current_date)
  
      # Add 'created' and 'updated' columns to UserIdentity
      _add_created_updated_columns('oauthclient_useridentity', current_date)
docs: Upgrade database.