Improve Caching and Cache-invalidation #6
Merged
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This update improves the caching for products and categories by ensuring that items are fetched once from the database.
Subsequent calls asking for the same resource or data will be returned from the cached version.
To ensure that results are not stale, cached data are invalidated when an update or deletion occurs. This helps to ensure that users receive the latest resource or resources anytime they make a request.
The current test cases still pass after a few minor tweaks as a result of the new change.