old_contents: # -*- coding: utf-8 -*-
  
  from sqlalchemy import (
      Column,
      Date,
      Integer,
      MetaData,
      Numeric,
      String,
      Table,
  )
  
  
  def define_tables(metadata):
      Table('measurement', metadata,
          Column('id', Integer, primary_key=True),
          Column('weight', Numeric(4, 1), nullable=False),
          Column('code', String(25), nullable=False),
          Column('note', String(140), nullable=True),
          Column('date_measured', Date(), nullable=False),
      )
  
  
  class Db(object):
      def __init__(self, engine):
          self._meta = MetaData(engine)
          define_tables(self._meta)
  
      def make_tables(self):
          self._meta.create_all()
  
      def drop_tables(self):
          self._meta.drop_all()
  
      @property
      def measurement(self):
          return self._meta.tables['measurement']
  
new_contents: # -*- coding: utf-8 -*-
  
  from sqlalchemy import (
      Column,
      Date,
      Integer,
      MetaData,
      Numeric,
      String,
      Table,
  )
  
  
  def define_tables(metadata):
      Table('measurement', metadata,
          Column('id', Integer, primary_key=True),
          Column('weight', Numeric(4, 1), nullable=False),
          Column('code', String(25), nullable=False),
          Column('note', String(140), nullable=True),
          Column('date_measured', Date(), nullable=False),
      )
  
  
  class Db(object):
      def __init__(self, engine):
          self._meta = MetaData(engine)
          define_tables(self._meta)
  
      def make_tables(self):
          self._meta.create_all()
  
      def drop_tables(self):
          self._meta.drop_all()
  
      @property
      def measurement(self):
          return self._meta.tables['measurement']
  
  
  class MeasurementService(object):
      def __init__(self, table):
          self.table = table
  
subject: Add missing measurement service.