Introduce backend for reports

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

priv/repo/migrations/20190712132438_create_report_notes.exs

@@ -0,0 +1,13 @@
+defmodule Mobilizon.Repo.Migrations.CreateReportNotes do
+  use Ecto.Migration
+
+  def change do
+    create table(:report_notes) do
+      add(:content, :string, null: false)
+      add(:moderator_id, references(:actors, on_delete: :delete_all), null: false)
+      add(:report_id, references(:reports, on_delete: :delete_all), null: false)
+
+      timestamps()
+    end
+  end
+end