create type region_type as enum ('NONE', 'DMA', 'SA', 'VD', 'WDA');

create table region
(
  id text primary key
, boundary geometry not null unique
, r_type region_type not null default 'NONE'
);

create index region_gist on region using gist(boundary);


create table temp_region
(
  id text primary key
, boundary geometry not null unique
);

create index temp_region_gist on temp_region using gist(boundary);


create table temp_node
(
  node varchar(32) primary key references _node(id)
);


create table temp_link
(
  link varchar(32) primary key references _link(id)
);


create table temp_vd_topology
(
  id serial
, source integer
, target integer
, cost float8
);