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diff --git a/priv/repo/migrations/20190414125034_migrate_old_bookmarks.exs b/priv/repo/migrations/20190414125034_migrate_old_bookmarks.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Repo.Migrations.MigrateOldBookmarks do
+  use Ecto.Migration
+  import Ecto.Query
+  alias Pleroma.Activity
+  alias Pleroma.Bookmark
+  alias Pleroma.Repo
+
+  def up do
+    query =
+      from(u in "users",
+        where: u.local == true,
+        where: fragment("array_length(?, 1)", u.bookmarks) > 0,
+        select: %{id: u.id, bookmarks: u.bookmarks}
+      )
+
+    Repo.stream(query)
+    |> Enum.each(fn %{id: user_id, bookmarks: bookmarks} ->
+      Enum.each(bookmarks, fn ap_id ->
+        activity =
+          ap_id
+          |> Activity.create_by_object_ap_id()
+          |> Repo.one()
+
+        unless is_nil(activity), do: {:ok, _} = Bookmark.create(user_id, activity.id)
+      end)
+    end)
+
+    alter table(:users) do
+      remove(:bookmarks)
+    end
+  end
+
+  def down do
+    alter table(:users) do
+      add(:bookmarks, {:array, :string}, null: false, default: [])
+    end
+  end
+end