Save state set in database

priv/repo/migrations/20210725151601_add_state_to_room.exs

@@ -0,0 +1,9 @@
+defmodule MatrixServer.Repo.Migrations.AddStateToRoom do
+  use Ecto.Migration
+
+  def change do
+    alter table(:rooms) do
+      add :state, :map, default: %{}, null: false
+    end
+  end
+end