old_contents: from sqlalchemy import Column, Integer, Float, String
  
  from zaifbot.models import Base
  
  
  class BollingerBands(Base):
      __tablename__ = 'bollinger_bands'
      time = Column('time', Integer, primary_key=True)
      currency_pair = Column('currency_pair', String, primary_key=True)
      period = Column('period', String, primary_key=True)
      length = Column('length', Integer, primary_key=True)
      sd1p = Column('sd1p', Float, nullable=False)
      sd2p = Column('sd2p', Float, nullable=False)
      sd3p = Column('sd3p', Float, nullable=False)
      sd1n = Column('sd1n', Float, nullable=False)
      sd2n = Column('sd2n', Float, nullable=False)
      sd3n = Column('sd3n', Float, nullable=False)
      closed = Column('closed', Integer, nullable=False)
new_contents: from sqlalchemy import Column, Integer, Float, String
  
  from zaifbot.models import Base
  
  
  class OrderLogs(Base):
      __tablename__ = 'order_logs'
      id = Column('id', Integer, primary_key=True)
      time = Column('time', Integer, primary_key=True)
      currency_pair = Column('currency_pair', String, primary_key=True)
      action = Column('action', String, nullable=False)
      price = Column('price', Float, nullable=False)
      amount = Column('amount', Float, nullable=False)
      limit = Column('limit', Float)
      received = Column('received', Float)
      remains = Column('remains', Float)
  
subject: add orderlogs model