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diff --git a/priv/repo/migrations/20201005123100_simple_policy_string_to_tuple.exs b/priv/repo/migrations/20201005123100_simple_policy_string_to_tuple.exs
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+++ b/priv/repo/migrations/20201005123100_simple_policy_string_to_tuple.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.SimplePolicyStringToTuple do
+  use Ecto.Migration
+
+  alias Pleroma.ConfigDB
+
+  def up, do: ConfigDB.get_by_params(%{group: :pleroma, key: :mrf_simple}) |> update_to_tuples
+  def down, do: ConfigDB.get_by_params(%{group: :pleroma, key: :mrf_simple}) |> update_to_strings
+
+  defp update_to_tuples(%{value: value}) do
+    new_value =
+      value
+      |> Enum.map(fn {k, v} ->
+        {k,
+         Enum.map(v, fn
+           {instance, reason} -> {instance, reason}
+           instance -> {instance, ""}
+         end)}
+      end)
+
+    ConfigDB.update_or_create(%{group: :pleroma, key: :mrf_simple, value: new_value})
+  end
+
+  defp update_to_tuples(nil), do: {:ok, nil}
+
+  defp update_to_strings(%{value: value}) do
+    new_value =
+      value
+      |> Enum.map(fn {k, v} ->
+        {k,
+         Enum.map(v, fn
+           {instance, _} -> instance
+           instance -> instance
+         end)}
+      end)
+
+    ConfigDB.update_or_create(%{group: :pleroma, key: :mrf_simple, value: new_value})
+  end
+
+  defp update_to_strings(nil), do: {:ok, nil}
+end