Implement a caching layer
Wrap expensive operations with a cache layer using Redis or in-memory LRU, with TTL, miss handling, and invalidation logic. Keeps the rest of the code untouched.
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Add a caching layer to the following [Language] code: [Paste code]. Use [Cache technology, e.g. Redis, Memcached, or an in-memory LRU]. Cache the results of expensive or frequently called operations, define a sensible TTL for each cached value, handle cache misses gracefully by falling through to the source, and add cache invalidation logic that runs whenever the underlying data changes.
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