Site DB reverted

I have a cpanel server and yeah, I had one more fresh wordpress site installed for a long time on the same account. so they shared same resources but different folders ofcourse. The site was fresh and I didn’t plan or had worked on it after installation though.

Anyways now that I have increased my DB backup frequency to per hour, and if the situation really arised out of this plugin, I still couldn’t live without it after using it for around 2 months. It just feels heavy and unreliable now without an object cache, atleast on my shared server. It managed to fasten the admin backend from around 3 seconds to nearly under 1 second.

So, I enabled it again today and the other wordpress site is also deleted, so no more wordpress sites for now. I am using multisite, with only one main site as subsite for now and your plugin is network activated forever anytime I activate it.

Now for the cache salt part, the hash we are talking about in the installation page is explicitly only directing to use a 12 character base64 one. Is it the limit for it? If not how far can we go, are there any consequences for doing it more or less than 12 characters?

And, what prerequisites if any do I need to follow before adding the salt, important part – where do I add it, in wp-config.php it isn’t there by default I saw. I also happen to use two more page caching plugins – flyingpress and super page cache, I read in installation that we need to deactivate the plugins before adding the salt in wp-config and then clear all the caches for all the plugins?

Just confirming if I am right. Even then, can you please write me the syntax and tell me the character limit for that base64 random string? And I guess it needs to be put into wp-config at any place but since any cache config is put at the top, i will do it just below it.

And yeah, I forget to tell, APCu is activated and was. its there in wp-config when i check it – define( 'WP_SQLITE_OBJECT_CACHE_APCU', true );

Regards

Update, I enabled both APCu and Zend Opcache, and now admin is super fast, nearly under 0.5s average for all requests where http requests are not required. I added the cache key salt in wp-config but i would still prefer confirmation.