feat(post-draft): add initial model for post drafts

.iex.exs

@@ -22,6 +22,7 @@ alias EpochtalkServer.Models.{
   Notification,
   Permission,
   Post,
+  PostDraft,
   Poll,
   PollAnswer,
   PollResponse,

lib/epochtalk_server/models/post_draft.ex

@@ -0,0 +1,29 @@
+defmodule EpochtalkServer.Models.PostDraft do
+  use Ecto.Schema
+  # alias EpochtalkServer.Repo
+  alias EpochtalkServer.Models.User
+
+  @moduledoc """
+  `PostDraft` model, for performing actions relating to a `User`'s `Post` draft
+  """
+  @type t :: %__MODULE__{
+          user_id: non_neg_integer | nil,
+          draft: String.t() | nil,
+          updated_at: NaiveDateTime.t() | nil
+        }
+  @derive {Jason.Encoder,
+           only: [
+             :user_id,
+             :draft,
+             :updated_at
+           ]}
+  @schema_prefix "posts"
+  @primary_key false
+  schema "user_drafts" do
+    belongs_to :user, User
+    field :draft, :string
+    field :updated_at, :naive_datetime
+  end
+
+  ## === Database Functions ===
+end