old_contents: from config import PASSWORD_LENGTH
  from sqlalchemy import BigInteger, Column, ForeignKey, String
  from sqlalchemy.ext.declarative import declarative_base
  
  Base = declarative_base()
  
  
  class User(Base):
      __tablename__ = 'user'
  
      id = Column(BigInteger, primary_key=True, autoincrement=True)
      password = Column(String(PASSWORD_LENGTH))
      fight_id = Column(BigInteger, ForeignKey('fight.id'))
  
      def __init__(self, password: str):
          self.password = password
  
  
  class Fight(Base):
      __tablename__ = 'fight'
  
      id = Column(BigInteger, primary_key=True, autoincrement=True)
      user_id = Column(BigInteger)
  
      def __init__(self, user_id: int):
          self.user_id = user_id
  
new_contents: from config import PASSWORD_LENGTH
  from sqlalchemy import BigInteger, Column, ForeignKey, String
  from sqlalchemy.ext.declarative import declarative_base
  
  Base = declarative_base()
  
  
  class User(Base):
      __tablename__ = 'user'
  
      id = Column(BigInteger, primary_key=True, autoincrement=True)
      password = Column(String(PASSWORD_LENGTH))
  
      def __init__(self, password: str):
          self.password = password
  
  
  class Fight(Base):
      __tablename__ = 'fight'
  
      id = Column(BigInteger, primary_key=True, autoincrement=True)
      user_id = Column(BigInteger, ForeignKey(User.id))
  
      def __init__(self, user_id: int):
          self.user_id = user_id
  
subject: Update user, fight foreign key dependency