Setting of valve [GPV] should be string

script/sql/create/7.valves.sql

@@ -9,7 +9,7 @@ create table valves
 , node2 varchar(32) references _node(id) not null
 , diameter numeric not null
 , type valves_type not null
-, setting numeric not null
+, setting text not null
 , minor_loss numeric not null
 );