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

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
);