Note: SSE-based live updates when data changes from any client

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

future-plans.md

@@ -21,6 +21,23 @@ that records every `set`/`delete` as a timestamped entry. The main file stays a
 clean current-state snapshot; the delta file accumulates the full history. Enables
 undo, audit trails, and debugging data corruption.
 
+## Real-time / live updates
+
+### Server-sent events for data changes
+When data changes on the server (upload, edit, delete — from any client), connected
+browsers should receive a notification and update the affected view automatically.
+Use case: uploading photos from a phone while the desktop browser has the Images or
+Bins section open.
+
+Server-sent events (SSE) are the natural fit — lightweight, one-directional, no
+library needed. The server emits a change event with a `type` (e.g. `source_images`,
+`bins`) and the client re-fetches and re-renders only the affected collection.
+Views that aren't currently visible don't need to do anything — they'll reload on
+next navigation.
+
+Ties directly into the delta tracking plan: the same write path that appends to the
+delta log can also fan out to connected SSE clients.
+
 ## App architecture
 
 ### parse_url mutates too many module-level variables