Session cleanup

[juliusknorr]

From chat:

the Text app needs fixing. The session clean up that was added is eating the memory:

Force-reset all Text document sessions

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PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 20480 bytes) in /var/www/cloud.nextcloud.com/nextcloud/lib/private/Files/Cache/Cache.php on line 188

[juliusknorr]

Maybe it could have been 10 minutes if I always watched the screen closely when it was done with the memory again

We should also speed this up