Tell us more about offline functionality: how does data saving work in IndexedDB when the internet is lost?

IndexedDB is a browser database that allows storing large volumes of structured data on the client side. When the internet connection is lost, the application can save user data in IndexedDB to ensure offline access and subsequent synchronization.

Here's how it works:

1. When attempting to send data to the server, the application checks network availability.
2. If the network is unavailable, data is saved in IndexedDB.
3. When the internet is restored, the application reads the accumulated data from IndexedDB and sends it to the server.
4. After successful transmission, the data is deleted from IndexedDB.

Thus, IndexedDB provides reliable offline data storage and smooth application operation without data loss.