new_contents: from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy import Column, String
  
  Base = declarative_base()
  
  
  class Label(Base):
      __tablename__ = 'labels'
  
      id = Column(String, primary_key=True)
      name = Column(String)
      color = Column(String)
      description = Column(String)
  
      def __repr__(self):
          return "<Label(name='%s', color='%s', description='%s')>" % (
              self.name, self.color, self.description)
  
  
  async def create_tables(engine):
      async with engine.begin() as conn:
          await conn.run_sync(Base.metadata.create_all)
  
subject: Add tables declaration in models.py