bookmarks in separate table

lib/pleroma/bookmark.ex

@@ -0,0 +1,53 @@
+defmodule Pleroma.Bookmark do
+  use Ecto.Schema
+
+  import Ecto.Changeset
+  import Ecto.Query
+
+  alias Pleroma.Activity
+  alias Pleroma.Bookmark
+  alias Pleroma.FlakeId
+  alias Pleroma.Repo
+  alias Pleroma.User
+
+  @type t :: %__MODULE__{}
+
+  schema "bookmarks" do
+    belongs_to(:user, User, type: FlakeId)
+    belongs_to(:activity, Activity, type: FlakeId)
+
+    timestamps()
+  end
+
+  @spec create(FlakeId.t(), FlakeId.t()) :: {:ok, Bookmark.t()} | {:error, Changeset.t()}
+  def create(user_id, activity_id) do
+    attrs = %{
+      user_id: user_id,
+      activity_id: activity_id
+    }
+
+    %Bookmark{}
+    |> cast(attrs, [:user_id, :activity_id])
+    |> validate_required([:user_id, :activity_id])
+    |> unique_constraint(:activity_id, name: :bookmarks_user_id_activity_id_index)
+    |> Repo.insert()
+  end
+
+  @spec for_user_query(FlakeId.t()) :: Ecto.Query.t()
+  def for_user_query(user_id) do
+    Bookmark
+    |> where(user_id: ^user_id)
+    |> join(:inner, [b], activity in assoc(b, :activity))
+    |> preload([b, a], activity: a)
+  end
+
+  @spec destroy(FlakeId.t(), FlakeId.t()) :: {:ok, Bookmark.t()} | {:error, Changeset.t()}
+  def destroy(user_id, activity_id) do
+    from(b in Bookmark,
+      where: b.user_id == ^user_id,
+      where: b.activity_id == ^activity_id
+    )
+    |> Repo.one()
+    |> Repo.delete()
+  end
+end