* fix handle empty keys in cache service
* add test
* add cache mock test
* add simpler mocking, and add tests for all the updated methods
* don't use RedisStore specifically in the mock
---------
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
* refactor: Set up ownership service
* refactor: Specify cache keys and values
* refactor: Replace util with service calls
* test: Mock service in tests
* refactor: Use dependency injection
* test: Write tests
* refactor: Apply feedback from Omar and Micha
* test: Fix tests
* test: Fix missing spot
* refactor: Return user entity from cache
* refactor: More dependency injection!
