The setup I was running a system where multiple backend servers each served a set of users, and a routing layer decided which server a given user's requests should go to. Nothing unusual this is a common shape for anything that scales past one machine. The question that turned out to matter a ...
Source: [Dev.to](https://dev.to/techwithhari/one-lookup-table-turned-a-risky-server-migration-into-a-one-line-change-2mf8)