removeing corresponding add activity

lib/pleroma/activity.ex

@@ -391,4 +391,13 @@ defmodule Pleroma.Activity do
   end
 
   def get_by_object_ap_id_with_object(_), do: nil
+
+  @spec add_by_params_query(String.t(), String.t(), String.t()) :: Ecto.Query.t()
+  def add_by_params_query(object_id, actor, target) do
+    object_id
+    |> Queries.by_object_id()
+    |> Queries.by_type("Add")
+    |> Queries.by_actor(actor)
+    |> where([a], fragment("?->>'target' = ?", a.data, ^target))
+  end
 end

lib/pleroma/web/activity_pub/side_effects.ex

@@ -340,11 +340,16 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
 
   # Tasks this handles:
   # - removes pin from user
+  # - removes corresponding Add activity
   # - if activity had expiration, recreates activity expiration job
   @impl true
   def handle(%{data: %{"type" => "Remove"} = data} = object, meta) do
     with %User{} = user <- User.get_cached_by_ap_id(data["actor"]),
          {:ok, _user} <- User.remove_pinned_object_id(user, data["object"]) do
+      data["object"]
+      |> Activity.add_by_params_query(user.ap_id, user.featured_address)
+      |> Repo.delete_all()
+
       # if pinned activity was scheduled for deletion, we reschedule it for deletion
       if meta[:expires_at] do
         # MRF.ActivityExpirationPolicy used UTC timestamps for expires_at in original implementation