feat: base work for post translations

lib/bds/posts/translation.ex

@@ -0,0 +1,48 @@
+defmodule BDS.Posts.Translation do
+  @moduledoc false
+
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :string, autogenerate: false}
+  @foreign_key_type :string
+  @statuses [:draft, :published]
+
+  schema "post_translations" do
+    belongs_to :post, BDS.Posts.Post, foreign_key: :translation_for, references: :id, type: :string
+
+    field :project_id, :string
+    field :language, :string
+    field :title, :string
+    field :excerpt, :string
+    field :content, :string
+    field :status, Ecto.Enum, values: @statuses, default: :draft
+    field :created_at, :integer
+    field :updated_at, :integer
+    field :published_at, :integer
+    field :file_path, :string, default: ""
+    field :checksum, :string
+  end
+
+  def changeset(translation, attrs) do
+    translation
+    |> cast(attrs, [
+      :id,
+      :project_id,
+      :translation_for,
+      :language,
+      :title,
+      :excerpt,
+      :content,
+      :status,
+      :created_at,
+      :updated_at,
+      :published_at,
+      :file_path,
+      :checksum
+    ], empty_values: [nil])
+    |> validate_required([:id, :project_id, :translation_for, :language, :title, :status, :created_at, :updated_at])
+    |> foreign_key_constraint(:translation_for)
+    |> unique_constraint(:language, name: :post_translations_translation_language_idx)
+  end
+end