Rake db: refuse to clean up old tables

My user migration looked like this:

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :login
      etc

      

        
        
        
      

    

It now looks like this:

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :username
      etc

      

        
        
        
      

    

Why am I seeing this?

rake db:drop
rake db:create
rake db:migrate
rails console
> User.new
+----+-------+------------------+---------------+-------------------+------------+------------+
| id | login | crypted_password | password_salt | persistence_token | created_at | updated_at |
+----+-------+------------------+---------------+-------------------+------------+------------+
|    |       |                  |               |                   |            |            |
+----+-------+------------------+---------------+-------------------+------------+------------+
1 row in set

      

        
        
        
      

    

I am using PostgreSQL.