discourse/db/migrate/20190514055014_add_read_not...

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# frozen_string_literal: true
class AddReadNotificationIndex < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
# doing this by hand cause I am ordering id DESC
execute <<~SQL
CREATE UNIQUE INDEX CONCURRENTLY index_notifications_on_read_or_n_type
ON notifications(user_id, id DESC, read, topic_id)
WHERE read or notification_type <> 6
SQL
# we need to do this to ensure this index hits
# on some sites this was missing prior
execute <<~SQL
VACUUM ANALYZE notifications
SQL
end
def down
raise ActiveRecord::IrreversibleMigration
end
end