in this file
libraries/src/Cache/Storage/RedisStorage.php

Steps to reproduce the issue

1. setup a redis server
2. define that server as a cache_handler + session_handler
3. use the same server for redis_server_host + session_redis_server_host
4. start caching stuff - and login
   on the first delete of a non group cache - you'll lose all of your sessions
   the easiest way to do that is to connect to redis with

redis-cli -h <host name>
HOST-NAME:PORT>monitor

and you'll see after a while these commands:

HOST-NAME:PORT>KEYS "*"
HOST-NAME:PORT>DEL <session-id 1>
HOST-NAME:PORT>DEL <session-id 2>
HOST-NAME:PORT>DEL <session-id 3>
....

Expected result

only -cache- keys should be deleted

Actual result

all keys are deleted from the server

System information (as much as possible)

Additional comments

if we set TTL - why do we even need the code going and deleting the keys ?