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diff --git a/priv/repo/migrations/20171109114020_fill_actor_field.exs b/priv/repo/migrations/20171109114020_fill_actor_field.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.FillActorField do
+  use Ecto.Migration
+
+  alias Pleroma.{Repo, Activity}
+
+  def up do
+    max = Repo.aggregate(Activity, :max, :id)
+
+    if max do
+      IO.puts("#{max} activities")
+      chunks = 0..round(max / 10_000)
+
+      Enum.each(chunks, fn i ->
+        min = i * 10_000
+        max = min + 10_000
+
+        execute("""
+        update activities set actor = data->>'actor' where id > #{min} and id <= #{max};
+        """)
+        |> IO.inspect()
+      end)
+    end
+  end
+
+  def down do
+  end
+end