create table if not exists follows (
  follower blob not null,
  followee blob not null,
  created_at datetime not null default CURRENT_TIMESTAMP,
  foreign key (follower) references users (id) on delete cascade on update no action,
  foreign key (followee) references users (id) on delete cascade on update no action,
  unique (follower, followee)
);
create index if not exists follows_follower_dex on follows (follower);
create index if not exists follows_followee_dex on follows (followee);