discourse/db/migrate/20120519182212_create_last_read_posts.rb

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class CreateLastReadPosts < ActiveRecord::Migration[4.2]
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def change
create_table :last_read_posts do |t|
t.integer :user_id, null: false
t.integer :forum_thread_id, null: false
t.integer :post_number, null: false
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t.timestamps null: false
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end
add_index :last_read_posts, [:user_id, :forum_thread_id], unique: true
end
end