Make user timelines faster for users with few statuses.

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -112,7 +112,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
 
   defp restrict_actor(query, %{"actor_id" => actor_id}) do
     from activity in query,
-      where: fragment("? @> ?", activity.data, ^%{actor: actor_id})
+      where: fragment("?->>'actor' = ?", activity.data, ^actor_id)
   end
   defp restrict_actor(query, _), do: query
 

lib/pleroma/web/ostatus/ostatus_controller.ex

@@ -19,7 +19,7 @@ defmodule Pleroma.Web.OStatus.OStatusController do
   def feed(conn, %{"nickname" => nickname}) do
     user = User.get_cached_by_nickname(nickname)
     query = from activity in Activity,
-      where: fragment("? @> ?", activity.data, ^%{actor: user.ap_id}),
+      where: fragment("?->>'actor' = ?", activity.data, ^user.ap_id),
       limit: 20,
       order_by: [desc: :inserted_at]
 

priv/repo/migrations/20170701142005_add_actor_index_to_activity.exs

+defmodule Pleroma.Repo.Migrations.AddActorIndexToActivity do
+  use Ecto.Migration
+
+  def change do
+    create index(:activities, ["(data->>'actor')", "inserted_at desc"], name: :activities_actor_index)
+  end
+end