Figure out references

script/sql/create/15.energy.sql

@@ -19,14 +19,20 @@ create table energy_pump_price
 , price numeric not null
 );
 
+-- delete when delete pump
+
 create table energy_pump_pattern
 (
   pump varchar(32) primary key references pumps(id) not null
 , pattern varchar(32) references _pattern(id) not null
 );
 
+-- delete when delete pump
+
 create table energy_pump_effic
 (
   pump varchar(32) primary key references pumps(id) not null
 , effic varchar(32) references _curve(id) not null
 );
+
+-- delete when delete pump