text: import os
  
  from sqlalchemy import (Column, DateTime, Integer, MetaData, String, Table,
                          create_engine)
  from sqlalchemy.sql import func
  
  from databases import Database
  
  # DATABASE_URL = os.getenv("DATABASE_URL")
  DATABASE_URL = "postgresql://hello_fastapi:hello_fastapi@localhost:5432/hello_fastapi_dev"
  
  # SQLAlchemy
  engine = create_engine(DATABASE_URL)
  metadata = MetaData()
  notes = Table(
      "notes",
      metadata,
      Column("id", Integer, primary_key=True),
      Column("title", String(50)),
      Column("description", String(50)),
      Column("created_date", DateTime, default=func.now(), nullable=False),
  )
  
  person = Table(
      "person_info",
      metadata,
      Column("id", Integer, primary_key=True),
      Column("name", String(50)),
      Column("idcard", String(50)),
      Column("hometown", String(50)),
      Column("address", String(50)),
      Column("created_date", DateTime, default=func.now(), nullable=False),
  )
  # databases query builder
  database = Database(DATABASE_URL)
  