new_contents: # -*- coding: utf-8 -*-
  from sqlalchemy import (Column, Float, ForeignKey, Integer, MetaData, String,
                          Table, join, create_engine, ForeignKeyConstraint,
                          Boolean, DateTime, Sequence)
  from sqlalchemy.orm import sessionmaker, relationship, configure_mappers
  # from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.ext.automap import automap_base
  # from geoalchemy2 import Geometry, shape
  import configparser as cp
  # from sqlalchemy.sql import func
  # from sqlalchemy.dialects import postgresql
  import os.path as path
  
  # read configuration file
  FILENAME = 'config.ini'
  FILE = path.join(path.expanduser("~"), '.open_eGo', FILENAME)
  cfg = cp.ConfigParser()
  cfg.read(FILE)
  
  # establish db connection
  section = 'Connection'
  conn = create_engine(
      "postgresql+psycopg2://{user}:{password}@{host}:{port}/{db}".format(
          user=cfg.get(section, 'username'),
          password=cfg.get(section, 'password'),
          host=cfg.get(section, 'host'),
          port=cfg.get(section, 'port'),
          db=cfg.get(section, 'db')))
  
  print("Connected to database.")
  
  # map schema
  session = sessionmaker(bind=conn)()
  
  meta = MetaData()
  meta.bind = conn
  meta.reflect(bind=conn, schema='calc_renpass_gis',
               only=['renpass_gis_scenario',
                     'renpass_gis_linear_transformer',
                     'renpass_gis_source',
                     'renpass_gis_sink',
                     'renpass_gis_storage'])
  
  # map to classes
  Base = automap_base(metadata=meta)
  Base.prepare()
  
  Scenario, LinearTransformer, Source, Sink, Storage = \
      Base.classes.renpass_gis_scenario,\
      Base.classes.renpass_gis_linear_transformer,\
      Base.classes.renpass_gis_source,\
      Base.classes.renpass_gis_sink,\
      Base.classes.renpass_gis_storage
  
subject: Add db reader/mapper for schema calc_renpass_gis