old_contents: from sqlalchemy import *
  from migrate import *
  
  metadata = MetaData()
      
  table = Table('crud_versions', metadata,
      Column('id', Integer, primary_key=True),
      Column('object_type', Text, nullable=False),
      Column('object_id', Integer, nullable=False),
      Column('commit_time', DateTime, nullable=False),
      Column('data', Blob, nullable=False),
      Column('blame', Text, nullable=False),
      Column('comment', Text, nullable=False),
  )
  
  def upgrade(migrate_engine):
      # Upgrade operations go here. Don't create your own engine; bind migrate_engine
      # to your metadata
      metadata.bind = migrate_engine
      table.create()
  
  def downgrade(migrate_engine):
      # Operations to reverse the above upgrade go here.
      table.drop()
  
new_contents: from sqlalchemy import *
  from migrate import *
  
  metadata = MetaData()
      
  table = Table('crud_versions', metadata,
      Column('id', Integer, primary_key=True),
      Column('object_type', Text, nullable=False),
      Column('object_id', Integer, nullable=False),
      Column('commit_time', DateTime, nullable=False),
      Column('data', LargeBinary, nullable=False),
      Column('blame', Text, nullable=False),
      Column('comment', Text, nullable=False),
  )
  
  def upgrade(migrate_engine):
      # Upgrade operations go here. Don't create your own engine; bind migrate_engine
      # to your metadata
      metadata.bind = migrate_engine
      table.create()
  
  def downgrade(migrate_engine):
      # Operations to reverse the above upgrade go here.
      table.drop()
  
subject: Fix some of the schema.