Admin API: GET /api/pleroma/admin/stats to get status count by visibility scope

lib/mix/tasks/pleroma/refresh_counter_cache.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Mix.Tasks.Pleroma.RefreshCounterCache do
+  @shortdoc "Refreshes counter cache"
+
+  use Mix.Task
+
+  alias Pleroma.Activity
+  alias Pleroma.CounterCache
+  alias Pleroma.Repo
+
+  require Logger
+  import Ecto.Query
+
+  def run([]) do
+    Mix.Pleroma.start_pleroma()
+
+    ["public", "unlisted", "private", "direct"]
+    |> Enum.each(fn visibility ->
+      count = status_visibility_count_query(visibility)
+      name = "status_visibility_#{visibility}"
+      CounterCache.set(name, count)
+      Mix.Pleroma.shell_info("Set #{name} to #{count}")
+    end)
+
+    Mix.Pleroma.shell_info("Done")
+  end
+
+  defp status_visibility_count_query(visibility) do
+    Activity
+    |> where(
+      [a],
+      fragment(
+        "activity_visibility(?, ?, ?) = ?",
+        a.actor,
+        a.recipients,
+        a.data,
+        ^visibility
+      )
+    )
+    |> where([a], fragment("(? ->> 'type'::text) = 'Create'", a.data))
+    |> Repo.aggregate(:count, :id, timeout: :timer.minutes(30))
+  end
+end