Very cool. Do you have a live demo, I want to play with it, especially for drag and drop with optimistic update.

Its on the clients platform, but maybe we can do a stripped down version, a git repo folks can try, let me see if I can get the team to cook this up quickly

Thanks for sharing back with the community! I like how you described not only what you did, but why you did it and some of the tradeoffs involved.

Performance Considerations

LiveView re-renders can add up with complex UIs. A few patterns kept the calendar smooth:

1. Use phx-update="replace" strategically

The default phx-update mode diffs and patches. For the appointments list, we use replace on the container — it’s faster to replace the whole grid than diff dozens of positioned cards.

The default phx-update is "replace"(Bindings — Phoenix LiveView v1.2.5). I wonder what performance problem you were hitting?