alter table users add column within_lat double default 2;
create table messages (id bigint not null auto_increment, user_id bigint(20) not null, from_user_id bigint(20) not null, title varchar(255), body text, sent_on datetime, message_read boolean default 0, primary key(id));
+
+create table friends (id bigint not null auto_increment, user_id bigint(20) not null, friend_user_id(20) not null, primary key(id));
+create index user_id_idx on friends(friend_user_id);