Source of truth

In multi-window applications, it’s important to have one source of truth per topic:

• the snapshot provider always returns the latest state
• invalidation events only “trigger” refresh

sourceId and self-echo

If the window that applied a change receives its own invalidation right away, that’s normal. But if it causes unnecessary refreshes, you can use:

• sourceId in the event (window/process ID)
• shouldRefresh(event) to ignore self-originated events

Choosing topics

Keep topics stable and domain-oriented:

• good: auth-state, app-config
• bad: settings-window (UI-oriented)