A cache belongs in Nextcloud's memory cache rather than in the app
config. Use the distributed cache (e.g. Redis) with a one-week TTL when
one is available; Nextcloud falls back to the local cache (APCu) when
only that is configured. Without any memory cache the lazy app config
value stays as the fallback. A leftover app config value is removed
when the categories are stored in the memory cache, and saving the
settings clears both.
dillard
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