Choose Design Pattern

I'm facing the following architectural problem and am looking for the right design pattern: **Problem:** [[PROBLEM_DESCRIPTION]] **Context/Language:** [[CONTEXT]] **Existing structure:** [[STRUCTURE]] Please: 1. Recommend 2-3 suitable design patterns with justification 2. Explain for each: pros and cons in my context 3. Show a concrete code example for the best option 4. Name anti-patterns I should avoidCopy