I designed the real‑time layer of Velozity using Socket.IO for authenticated WebSocket communication, role‑scoped broadcast rooms, and an in‑process node‑cron job to flag overdue tasks every minute.
The transport library is Socket.IO, chosen for production‑grade capabilities.
Broadcast rooms follow the Role‑Filtered Broadcast Strategy.
The cron schedule runs the SQL UPDATE "Task" SET "isOverdue" = true WHERE "dueDate" < NOW() AND "status" != 'DONE' AND "isOverdue" = false; each minute.