This example shows a Redux-based offline-first data visualization for a rail system, persisting station directory data to localStorage and using a service worker to cache assets for offline use. The code uses `localforage` for asynchronous storage, `axios` for fetching JSON station data, and `throttle` from Lodash to limit state saves. It demonstrates a fetch-then-cache strategy where API responses are stored locally, while the service worker intercepts network requests to serve cached resources or fall back to offline behavior. The visualization itself is not shown, but the data flow centers on storing and retrieving station directory JSON to support the application’s offline functionality.