mastodon/db/migrate/20161119211120_create_notifications.rb

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class CreateNotifications < ActiveRecord::Migration[5.0]
def change
create_table :notifications do |t|
t.integer :account_id
t.integer :activity_id
t.string :activity_type
t.timestamps
end
add_index :notifications, :account_id
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add_index :notifications, [:account_id, :activity_id, :activity_type], unique: true, name: 'account_activity'
end
end