Valkey
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What is it?
An in-memory data store, designed specifically for simplicity and performance over powerful configuration.
Why did we choose it?
It's one of the primary contenders for running cache servers, the otherothers being memcached and memcachedRedis. Valkey is a fork of Redis, which has gained a lot of popularity after Redis recently changed its licensing terms to be more restrictive.
What do we use it for?
Deserted Chateau's cache servers, that store user session data, and cache various bits of data we don't want to retrieve constantly (such as search results).