5126. Design Scalable Chat Service with WebSockets & Redis PubSub (Part 57)
ScalabilityMessage Queues
### Problem #5126: Design Scalable Chat Service with WebSockets & Redis PubSub (Part 57)
**Domain:** `System Design` | **Topic Focus:** `Scalability, Message Queues`
Implement an optimized, production-grade solution for **Design Scalable Chat Service with WebSockets & Redis PubSub (Part 57)**.
### Requirements:
1. Your code must handle boundary inputs, edge cases, and maintain optimal time & space complexity.
2. In production, this logic scales to high-throughput environments.
3. Return the exact computed result.
Example 1:
Input: Sample Input #5126
Output: Output 1
Explanation: Demonstrates correct execution for Scalability in System Design.
Constraints:
- Time Complexity: Optimal for standard production loads.
- Space Complexity: O(1) auxiliary or O(N) linear storage.
- Ensure memory safety, clean error propagation, and zero race conditions.