Silent message loss in Phoenix.PubSub when scaling to a second non‑clustered node
Goal: Determine the safest, lowest‑cost approach to handle Phoenix.PubSub when a low‑traffic application might later be scaled to a second node. Constraints: The current cheapest setup runs a single release with server mode enabled, relies on the default PG2‑style PubSub adapter, and accepts a brief availability gap during each deploy. Adding a second node w