Custom pruning is not actually needed because an old job cannot exist in the table due to our use of [replace: true] when retrying jobs or walking it through the different phases

config/config.exs

@@ -599,12 +599,11 @@ config :pleroma, Oban,
     search_indexing: [limit: 10, paused: true],
     slow: 5
   ],
-  plugins: [{Oban.Plugins.Pruner, max_age: 900, exclude: [Pleroma.Workers.ReachabilityWorker]}],
+  plugins: [{Oban.Plugins.Pruner, max_age: 900}],
   crontab: [
     {"0 0 * * 0", Pleroma.Workers.Cron.DigestEmailsWorker},
     {"0 0 * * *", Pleroma.Workers.Cron.NewUsersDigestWorker},
-    {"*/10 * * * *", Pleroma.Workers.Cron.AppCleanupWorker},
+    {"*/10 * * * *", Pleroma.Workers.Cron.AppCleanupWorker}
-    {"0 2 * * *", Pleroma.Workers.Cron.ReachabilityPruner}
   ]
 
 config :pleroma, Pleroma.Formatter,

lib/pleroma/workers/cron/reachability_pruner.ex

@@ -1,26 +0,0 @@
-defmodule Pleroma.Workers.Cron.ReachabilityPruner do
-  use Oban.Worker, queue: :background, max_attempts: 1
-
-  import Ecto.Query
-  require Logger
-
-  @reachability_worker "Elixir.Pleroma.Workers.ReachabilityWorker"
-  @prune_days 2
-
-  @impl true
-  def perform(_job) do
-    cutoff = DateTime.utc_now() |> DateTime.add(-@prune_days * 24 * 60 * 60, :second)
-
-    {count, _} =
-      from(j in Oban.Job,
-        where: j.worker == @reachability_worker and j.inserted_at < ^cutoff
-      )
-      |> Pleroma.Repo.delete_all()
-
-    if count > 0 do
-      Logger.debug(fn -> "Pruned #{count} old ReachabilityWorker jobs." end)
-    end
-
-    :ok
-  end
-end