Introduce backend for reports

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

lib/mobilizon/admin/action_log.ex

@@ -0,0 +1,27 @@
+defmodule Mobilizon.Admin.ActionLog do
+  @moduledoc """
+  ActionLog entity schema
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+  alias Mobilizon.Actors.Actor
+
+  @required_attrs [:action, :target_type, :target_id, :changes, :actor_id]
+
+  schema "admin_action_logs" do
+    field(:action, :string)
+    field(:target_type, :string)
+    field(:target_id, :integer)
+    field(:changes, :map)
+    belongs_to(:actor, Actor)
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(action_log, attrs) do
+    action_log
+    |> cast(attrs, @required_attrs)
+    |> validate_required(@required_attrs -- [:changes])
+  end
+end