Add table for sub region type

script/sql/create/32.region.sql

@@ -1,6 +1,9 @@
+create type region_type as enum ('NONE', 'DMA', 'SA', 'VD', 'WDA');
+
 create table region
 (
   id text primary key
+, r_type region_type not null default 'NONE'
 , boundary geometry not null unique
 );