read Region sections in inp

script/sql/create/0.base.sql

@@ -4,6 +4,8 @@ create type _link_type as enum ('pipe', 'pump', 'valve');
 
 create type _curve_type as enum ('PUMP', 'EFFICIENCY', 'VOLUME', 'HEADLOSS');
 
+create type _region_type as enum ('DISTRIBUTION', 'DMA', 'SA', 'PMA','VA');
+
 create table _node
 (
   id varchar(32) primary key
@@ -26,3 +28,9 @@ create table _pattern
 (
   id varchar(32) primary key
 );
+
+create table _region
+(
+  id varchar(32) primary key
+, type _region_type not null
+);

script/sql/drop/0.base.sql

@@ -1,3 +1,5 @@
+drop table if exists _region;
+
 drop table if exists _pattern;
 
 drop table if exists _curve;