2026 Node.js Tests for Batched Realtime Delivery in Stock Watchlists
Short answer: use a realtime surface that supports batched delivery, then make token scope, subscription state, and recovery observable in the watchlist test itself. A fake clock and an explicit event ledger remove timing luck; a vendor choice cannot. The bill is mostly retention, not the handful of poll updates. Keeping every quote, presence transition, and reconnect payload forever makes the storage line item grow with the session history. Keep a compact audit record for the decision, retain…