More efficient queries.

lib/pleroma/web/activity_pub/utils.ex

@@ -242,8 +242,9 @@ def fetch_latest_follow(%User{ap_id: follower_id}, %User{ap_id: followed_id}) do
           fragment(
             "? @> ?",
             activity.data,
-            ^%{type: "Follow", actor: follower_id, object: followed_id}
+            ^%{type: "Follow", object: followed_id}
           ),
+        where: activity.actor == ^follower_id,
         order_by: [desc: :id],
         limit: 1
       )
@@ -260,7 +261,7 @@ def get_existing_announce(actor, %{data: %{"id" => id}}) do
     query =
       from(
         activity in Activity,
-        where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
+        where: activity.actor == ^actor,
         # this is to use the index
         where:
           fragment(

test/support/factory.ex

@@ -95,7 +95,8 @@ def follow_activity_factory do
     }
 
     %Pleroma.Activity{
-      data: data
+      data: data,
+      actor: follower.ap_id
     }
   end