migrate user.bookmarks to separate table

priv/repo/migrations/20190414125034_migrate_old_bookmarks.exs

@@ -0,0 +1,21 @@
+defmodule Pleroma.Repo.Migrations.MigrateOldBookmarks do
+  use Ecto.Migration
+  alias Pleroma.Activity
+  alias Pleroma.Bookmark
+  alias Pleroma.User
+  alias Pleroma.Repo
+
+  def up do
+    Repo.all(User)
+    |> Enum.each(fn user ->
+      Enum.each(user.old_bookmarks, fn id ->
+        activity = Activity.get_create_by_object_ap_id(id)
+        {:ok, _} = Bookmark.create(user.id, activity.id)
+      end)
+    end)
+  end
+
+  def down do
+    execute("TRUNCATE TABLE bookmarks")
+  end
+end