Fix follow IDs (#455)

* Generate valid IDs for Follow

Fixes #449

* Use the new post-insert hook for all the models

* Fix plume-cli build

src/routes/blogs.rs

@@ -105,7 +105,6 @@ pub fn create(conn: DbConn, form: LenientForm<NewBlogForm>, user: User, intl: I1
             String::from(""),
             Instance::get_local(&*conn).expect("blog::create: instance error").id
         ).expect("blog::create: new local error")).expect("blog::create:  error");
-        blog.update_boxes(&*conn).expect("blog::create: insert error");
 
         BlogAuthor::insert(&*conn, NewBlogAuthor {
             blog_id: blog.id,