Adding bodymass support

db/createdb.sql

@@ -11,7 +11,18 @@ create table account (
 	id serial primary key,
 	name varchar not null,
 	login varchar not null,
-	birthdate date not null
+	birthdate date not null,
+	bodymass integer,
+	constraint fk_bodymass foreign key (bodymass) references bodymass(id)
+);
+create table bodymass (
+	id serial primary key,
+	account integer not null,
+	time timestamptz not null,
+	kilos numeric(4,1) not null,
+	constraint fk_account foreign key (account) references account(id),
+	constraint unique_account_time unique (account, time),
+	constraint time_not_infty check (time <> 'infinity'::timestamptz)
 );
 create table training (
 	id serial primary key,