catstodon/db/migrate/20180510230049_migrate_web_push_subscriptions.rb

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class MigrateWebPushSubscriptions < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
add_index :web_push_subscriptions, :user_id, algorithm: :concurrently
add_index :web_push_subscriptions, :access_token_id, algorithm: :concurrently
end
def down
remove_index :web_push_subscriptions, :user_id
remove_index :web_push_subscriptions, :access_token_id
end
end