zadd memory leak

[Notanotherdotcom]

In case anyone checks this - this line seems to to grow unchecked over time as it doesn't seem to prune ever:

$this->redis->zAdd('ts', $time, $key);

It's also not prefixed so multiple pw sites would be better having this:

$this->redis->zAdd("{$this->prefix}:ts", $time, $key);

Current solution is this:

$tsKey = $this->prefix . ':ts';
$sessionLifetime = isset($this->config->sessionExpireSeconds) ? (int)$this->config->sessionExpireSeconds : 3600;

	$this->redis->zAdd($tsKey, $time, $key);
	$this->redis->zRemRangeByScore($tsKey, 0, $time - $sessionLifetime);

I may fork this module to work on it further as I know it's old, but putting the notes here as an issue report for now for others to see