Mastodon API: ensure the notification endpoint doesn't return less than the requested amount of records unless it's the last page

priv/repo/migrations/20200527163635_delete_notifications_from_invisible_users.exs

@@ -0,0 +1,18 @@
+defmodule Pleroma.Repo.Migrations.DeleteNotificationsFromInvisibleUsers do
+  use Ecto.Migration
+
+  import Ecto.Query
+  alias Pleroma.Repo
+
+  def up do
+    Pleroma.Notification
+    |> join(:inner, [n], activity in assoc(n, :activity))
+    |> where(
+      [n, a],
+      fragment("? in (SELECT ap_id FROM users WHERE invisible = true)", a.actor)
+    )
+    |> Repo.delete_all()
+  end
+
+  def down, do: :ok
+end