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mastodon/db/migrate/20201206004238_create_instances.rb

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# frozen_string_literal: true
class CreateInstances < ActiveRecord::Migration[5.2]
def change
create_view :instances, materialized: true
# To be able to refresh the view concurrently,
# at least one unique index is required
safety_assured { add_index :instances, :domain, unique: true }
end
end