Airplane mode: enabling Trello mobile offline

This post details the initial architectural changes for Trello's mobile offline mode, focusing on the Android app. It describes the shift from an online-only architecture (UI interaction directly triggering network requests) to an offline-first architecture where the local database becomes central. The database now acts as a simulacrum of the Trello server, and the network portion is optional. Two key changes are highlighted: making the database mimic the server's logic and implementing a system to sync changes with Trello servers (to be detailed in a future post). The post also introduces the concept of handling local vs. server-assigned identifiers, with a 'local-server barrier' and an annotation-based ID converter.