create table if not exists follows (
  follower blob not null,
  followee blob not null,
  created_at int not null default (unixepoch()),
  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);