Merge branch 'fix/2134-old-cron-jobs' into 'develop'

Migration to remove old cron jobs

Closes #2134

See merge request pleroma/pleroma!2987

priv/repo/migrations/20200911055909_remove_cron_jobs.exs

@@ -0,0 +1,20 @@
+defmodule Pleroma.Repo.Migrations.RemoveCronJobs do
+  use Ecto.Migration
+
+  import Ecto.Query, only: [from: 2]
+
+  def up do
+    from(j in "oban_jobs",
+      where:
+        j.worker in ^[
+          "Pleroma.Workers.Cron.PurgeExpiredActivitiesWorker",
+          "Pleroma.Workers.Cron.StatsWorker",
+          "Pleroma.Workers.Cron.ClearOauthTokenWorker"
+        ],
+      select: [:id]
+    )
+    |> Pleroma.Repo.delete_all()
+  end
+
+  def down, do: :ok
+end