add triggers for follows table, lowercase username index

migrations/20230426221940_init.up.sql

@@ -41,8 +41,7 @@ create table if not exists watch_quests (
   foreign key (watch) references watches (id) on delete cascade on update no action
 );
 
--- friend lists; this should really be a graph db, maybe the whole thing should be
--- TODO: look into replacing sqlite with https://www.cozodb.org/
+-- friend lists; created by trigger at the same time as the user, so no created_at needed
 create table if not exists follows (
   user blob not null primary key,
   follows blob, -- possibly empty friends list in some app-specific format
@@ -51,18 +50,18 @@ create table if not exists follows (
 );
 
 create table if not exists watch_notes (
-  id blob not null primary key,
   user blob not null,
   watch blob not null,
   note blob,
   public boolean not null,
+  created_at int not null default (unixepoch()),
   last_updated int not null default (unixepoch()),
   foreign key (user) references users (id) on delete cascade on update no action,
   foreign key (watch) references watches (id) on delete cascade on update no action
 );
 
 -- indices, not needed for follows
-create index if not exists user_username_dex on users (username);
+create index if not exists user_username_dex on users (lower(username));
 create index if not exists user_email_dex on users (lower(email));
 create index if not exists watch_title_dex on watches (lower(title));
 create index if not exists watch_added_by_dex on watches (added_by);

migrations/20230427212229_update_triggers.up.sql

@@ -5,6 +5,18 @@ BEGIN
   update users set last_updated = (select unixepoch()) where id=NEW.id;
 END;
 
+create trigger if not exists insert_user_follows
+  after insert on users
+BEGIN
+  insert into follows (user) values (NEW.id);
+END;
+
+create trigger if not exists delete_user_follows
+  after delete on users
+BEGIN
+  delete from follows where user = OLD.id;
+END;
+
 create trigger if not exists update_last_updated_watches
   after update on watches
   when OLD.last_updated = NEW.last_updated or OLD.last_updated is null