old_contents: import sqlalchemy as sql
  
  _ENDPOINT_TABLE_NAME = 'service'
  
  def upgrade(migrate_engine):
      meta = sql.MetaData()
      meta.bind = migrate_engine
  
      endpoint_table = sql.Table(_ENDPOINT_TABLE_NAME, meta, autoload=True)
  
      endpoint_desc = sql.Column('description', sql.String(255), nullable=False)
      endpoint_table.create_column(endpoint_desc)
new_contents: import sqlalchemy as sql
  
  _ENDPOINT_TABLE_NAME = 'endpoint'
  
  def upgrade(migrate_engine):
      meta = sql.MetaData()
      meta.bind = migrate_engine
  
      endpoint_table = sql.Table(_ENDPOINT_TABLE_NAME, meta, autoload=True)
  
      endpoint_desc = sql.Column('description', sql.String(255), nullable=False)
      endpoint_table.create_column(endpoint_desc)
subject: fix a little bug when adding 'desc' to endpoint.