Replace all "numeric" with "float8"

script/sql/create/5.pipes.sql

@@ -7,10 +7,10 @@ create table pipes
   id varchar(32) primary key references _link(id)
 , node1 varchar(32) references _node(id) not null
 , node2 varchar(32) references _node(id) not null
-, length numeric not null
-, diameter numeric not null
-, roughness numeric not null
-, minor_loss numeric not null
+, length float8 not null
+, diameter float8 not null
+, roughness float8 not null
+, minor_loss float8 not null
 , status pipes_status not null
 , check (node1 <> node2)
 );