Abstract out the database maintenance. I'd like to use this from AdminFE too.

lib/pleroma/maintenance.ex

@@ -0,0 +1,37 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Maintenance do
+  alias Pleroma.Repo
+  require Logger
+
+  def vacuum(args) do
+    case args do
+      "analyze" ->
+        Logger.info("Runnning VACUUM ANALYZE.")
+
+        Repo.query!(
+          "vacuum analyze;",
+          [],
+          timeout: :infinity
+        )
+
+      "full" ->
+        Logger.info("Runnning VACUUM FULL.")
+
+        Logger.warn(
+          "Re-packing your entire database may take a while and will consume extra disk space during the process."
+        )
+
+        Repo.query!(
+          "vacuum full;",
+          [],
+          timeout: :infinity
+        )
+
+      _ ->
+        Logger.error("Error: invalid vacuum argument.")
+    end
+  end
+end