feat: hopefully last part of persistence

lib/bds/media/translation.ex

@@ -0,0 +1,30 @@
+defmodule BDS.Media.Translation do
+  @moduledoc false
+
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :string, autogenerate: false}
+  @foreign_key_type :string
+
+  schema "media_translations" do
+    belongs_to :media, BDS.Media.Media, foreign_key: :translation_for, references: :id, type: :string
+    field :project_id, :string
+    field :language, :string
+    field :title, :string
+    field :alt, :string
+    field :caption, :string
+    field :created_at, :integer
+    field :updated_at, :integer
+  end
+
+  def changeset(translation, attrs) do
+    translation
+    |> cast(attrs, [:id, :project_id, :translation_for, :language, :title, :alt, :caption, :created_at, :updated_at],
+      empty_values: [nil]
+    )
+    |> validate_required([:id, :project_id, :translation_for, :language, :created_at, :updated_at])
+    |> foreign_key_constraint(:translation_for)
+    |> unique_constraint(:language, name: :media_translations_translation_language_idx)
+  end
+end