code: protected long getLastTriggersReleaseTime(T jedis){
          final String lastReleaseTime = jedis.get(redisSchema.lastTriggerReleaseTime());
          if(lastReleaseTime == null){
              return 0;
          }
          return Long.parseLong(lastReleaseTime);
      }
docs: Retrieve the last time (in milliseconds) that orphaned triggers were released
  @param jedis a thread-safe Redis connection
  @return a unix timestamp in milliseconds