One POST Per Week: Scaling Real-Time Collaboration Without Exploding Server Costs

Real-time collaboration at scale requires balancing live updates with infrastructure costs and AI model expenses. This architecture demonstrates how conditional persistence—caching at the domain level rather than per-user view and restricting AI calls to once weekly—reduces storage by two orders of magnitude while maintaining full-fidelity collaboration. For teams building productivity tools, it's a practical blueprint for scaling without proportional cost increases.