WIP notification settings

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20210601082613_fix_user_settings_nullable_fields.exs

@@ -0,0 +1,10 @@
+defmodule Mobilizon.Storage.Repo.Migrations.FixUserSettingsNullableFields do
+  use Ecto.Migration
+
+  def change do
+    alter table(:user_settings) do
+      modify(:group_notifications, :integer, default: 10, null: false)
+      modify(:last_notification_sent, :utc_datetime, null: true)
+    end
+  end
+end