Prompt
Help us design cache updates based on the goals and resources below. [input] Goals and usage situations: I'd like to resolve a blockage in my cache update design and decide on my next course of action. Resources to review: Inquiry flow and change events Conditions and Constraints: Please proceed based on the provided data, and mark any missing facts as requiring confirmation. Previous attempts and records: This is my first attempt. Please proceed from the parts that can be confirmed in the current data. [Key points to check in this topic] Check cache key, validity period, invalidation, and data boundaries for each user. [Results to be created this time] Find branches, abstractions, and state that are not needed to meet the current need. Check the rationale for removal and impact on callers, and suggest simplification in small units. Convert it to an explainable structure while preserving existing behavior and tests. [Working Principle] Give priority to facts confirmed in the current environment and provided code. Don't create APIs/files/tests that don't exist. Treat sensitive values as hidden examples and leave unexecuted tasks as unexecuted. If there is no input that will change the results, ask only the necessary questions first and proceed with the parts that can be confirmed with data. [Completion criteria] Ensure complexity is reduced without changing externally observable behavior. Distinguish between the basis for the outcome, remaining uncertainties, and next actions, and mark only what has actually been confirmed as complete.