Live updating of date dones (polling, cross-tab, websockets)

[aduth]

It's common to keep a Dones tab open in the background all day, or open multiple tabs of Dones. To keep up to date with dones added in other tabs (either by the current user or other users), it would be nice if updates were reflected automatically.

Options:

• Naive polling on an interval (one minute?)
• Live updates by websockets (difficult to support for all hosts?)
• Cross-tab communication using techniques like localStorage monitoring (e.g. crosstab, only works for updating current user dones)