Building the Black Friday-Cyber Monday live dashboard

What this post added

This post details the technical implementation of the Black Friday-Cyber Monday live dashboard. It covers the dashboard's Next.js architecture with a modified polling approach, backend optimizations using rolling windows for queries and Upstash KV for cumulative counts, and frontend optimizations with Incremental Static Regeneration (ISR) for caching and `requestAnimationFrame` for dynamic number animations. It also touches on accuracy measures for preventing over/undercounting.