Initial commit

script/sql/create/6.pumps.sql

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+-- [PUMPS]
+
+create table pumps
+(
+  id varchar(32) primary key references _link(id)
+, node1 varchar(32) references _node(id) not null
+, node2 varchar(32) references _node(id) not null
+, power float8
+, head varchar(32) references _curve(id)
+, speed float8
+, pattern varchar(32) references _pattern(id)
+, check (power is not null or head is not null)
+, check ((power is not null and head is not null) is false)
+);
+
+-- delete when delete node1
+-- delete when delete node2
+-- unset head when delete curve
+-- unset pattern when delete pattern