hope you well, To scale Baileys for 1K–5K concurrent sessions, prioritize horizontal scaling on EC2 Auto Scaling Groups (ASGs) over pure vertical scaling or ECS Fargate, as Baileys' stateful WebSocket nature (in-memory auth and event handling) benefits from sticky routing and fast shared-state access. Use EC2 for better control over long-running processes and reconnections. Combine Redis (sharded for scale) + DynamoDB for persistence. Implement health checks and periodic restarts to prevent 48-hour drops. For auto-scaling, use a central session registry (e.g., in DynamoDB) to assign new sessions to nodes dynamically