feat: wait for enrolled sensors to announce, factory reset them on deletion

lib/localiser/domain/schema/sensor.ex

@@ -7,6 +7,7 @@ defmodule Localiser.Domain.Schema.Sensor do
 
   schema "sensors" do
     field :sensor_id, :string
+    field :confirmed, :boolean, default: false
     field :x, :float
     field :y, :float
     field :floor_x, :float, virtual: true
@@ -21,7 +22,7 @@ defmodule Localiser.Domain.Schema.Sensor do
   @doc false
   def changeset(sensor, attrs) do
     sensor
-    |> cast(attrs, [:sensor_id, :room_id, :x, :y])
+    |> cast(attrs, [:sensor_id, :confirmed, :room_id, :x, :y])
     |> validate_required([:sensor_id])
     |> unique_constraint(:sensor_id)
     |> assoc_constraint(:room)