Queue individual jobs for each user that needs to be deleted when deleting an instance.

test/pleroma/workers/delete_worker_test.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.Workers.DeleteWorkerTest do
+  use Pleroma.DataCase, async: true
+  use Oban.Testing, repo: Pleroma.Repo
+
+  import Pleroma.Factory
+
+  alias Pleroma.Instances.Instance
+  alias Pleroma.Tests.ObanHelpers
+  alias Pleroma.Workers.DeleteWorker
+
+  describe "instance deletion" do
+    test "creates individual Oban jobs for each user when deleting an instance" do
+      user1 = insert(:user, nickname: "alice@example.com", name: "Alice")
+      user2 = insert(:user, nickname: "bob@example.com", name: "Bob")
+
+      {:ok, job} = Instance.delete_users_and_activities("example.com")
+
+      assert_enqueued(
+        worker: DeleteWorker,
+        args: %{"op" => "delete_instance", "host" => "example.com"}
+      )
+
+      {:ok, :ok} = ObanHelpers.perform(job)
+
+      delete_user_jobs = all_enqueued(worker: DeleteWorker, args: %{"op" => "delete_user"})
+
+      assert length(delete_user_jobs) == 2
+
+      user_ids = [user1.id, user2.id]
+      job_user_ids = Enum.map(delete_user_jobs, fn job -> job.args["user_id"] end)
+
+      assert Enum.sort(user_ids) == Enum.sort(job_user_ids)
+    end
+  end
+end