Suggestion to abstract away IndexedDB requirement

Right now, the UI depends heavily on IndexedDB being available using it as a live DB during normal operation (and not only for persistance).

This causes problems in browsers that disable IndexedDB access in private/incognito mode such as Firefox.

I suggest we use an in-mem abstraction for data storage during normal operation and only use IndexedDB or localStorage for persistence between sessions.

One option would be something like: https://github.com/agershun/alasql

Start by locating the UI's IndexedDB usage and persistence paths; the issue names no files or tests. Compare the current live-storage behavior with an in-memory approach, then verify that sessions still persist through IndexedDB or localStorage and that normal operation works when IndexedDB is unavailable.

Written by the indexing model from the issue text.