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A user updates their profile, refreshes the page, and still sees the version from before the update.
What you'll have at the end
A test that writes a new value to the database and immediately reads the fresh value back through the cache.
You need
A write endpoint that updates a database record, and a read endpoint already serving that same record through a working cache in front of it.
Not covered
This does not cover clearing one record's cache entry across multiple cache nodes or regions, or the surge of requests a popular key can trigger when it expires; it covers making one cache agree with the database right after a single write.
Leans on
Namespace your cache keys so two different lookups never collide
If your cache keys are reused or ambiguous across different lookups, a delete here can clear the wrong entry or miss the right one.
Survive a cache stampede under load
Once a lot of concurrent traffic hits a key right after you delete it, the risk shifts from one stale read to many requests missing the cache at the same moment.
Checked 18 Aug 2026
Part of the Backend Caching cookbook