def expire_leaderboard_at_for(self, leaderboard_name, timestamp):
pipeline = self.redis_connection.pipeline()<EOL>pipeline.expireat(leaderboard_name, timestamp)<EOL>pipeline.expireat(<EOL>self._ties_leaderboard_key(leaderboard_name), timestamp)<EOL>pipeline.expireat(self._member_data_key(leaderboard_name), timestamp)<EOL>pipeline.execute()<EOL>
Expire the given leaderboard at a specific UNIX timestamp. Do not use this with
leaderboards that utilize member data as there is no facility to cascade the
expiration out to the keys for the member data.

@param leaderboard_name [String] Name of the leaderboard.
@param timestamp [int] UNIX timestamp at which the leaderboard will be expired.