[fractal] (9 commits) Created branch backend

[Daniel Garcia Moreno <danigm src gnome org>]

The branch 'backend' was created.

Summary of new commits:

  3fc72f6... backend: Initial backend crate with Room model
  22c44a5... backend: Move room model to their own module
  d81c434... backend: Message initial db model
  379f2ff... Thread local singleton for the connection
  c32af3c... backend: Room and Message relation in database
  067dd1f... backend: Store power_levels hashmap
  e2c64f2... backend: Member model and relation with room
  8e8d53f... Update cargo.lock
  eabb8c9... Fix model tables with latest master changes