code: def _get_db_schema(cls):
      schema = cls.schema
  
      m = MetaData(schema=schema)
  
      Table(
          "user",
          m,
          Column("id", Integer, primary_key=True),
          Column("name", String(50)),
          Column("a1", Text),
          Column("pw", String(50)),
          Index("pw_idx", "pw"),
      )
  
      Table(
          "address",
          m,
          Column("id", Integer, primary_key=True),
          Column("email_address", String(100), nullable=False),
      )
  
      Table(
          "order",
          m,
          Column("order_id", Integer, primary_key=True),
          Column(
              "amount",
              Numeric(8, 2),
              nullable=False,
              server_default=text("0"),
          ),
          CheckConstraint("amount >= 0", name="ck_order_amount"),
      )
  
      Table(
          "extra",
          m,
          Column("x", CHAR),
          Column("uid", Integer, ForeignKey("user.id")),
      )
  
      return m
  
imports: from __future__ import annotations
  from typing import Any
  from typing import Dict
  from typing import Set
  from sqlalchemy import CHAR
  from sqlalchemy import CheckConstraint
  from sqlalchemy import Column
  from sqlalchemy import event
  from sqlalchemy import ForeignKey
  from sqlalchemy import Index
  from sqlalchemy import inspect
  from sqlalchemy import Integer
  from sqlalchemy import MetaData
  from sqlalchemy import Numeric
  from sqlalchemy import String
  from sqlalchemy import Table
  from sqlalchemy import Text
  from sqlalchemy import text
  from sqlalchemy import UniqueConstraint
  from ...None import autogenerate
  from ...None import util
  from ...autogenerate import api
  from ...ddl.base import _fk_spec
  from ...migration import MigrationContext
  from ...operations import ops
  from ...testing import config
  from ...testing import eq_
  from ...testing.env import clear_staging_env
  from ...testing.env import staging_env
label_desc: Use image node_id 1 for calling the ModelOne obj's underlying member method code with example usage: obj._get_db_schema(cls) and returns: m