Also prune removes and undos

docs/docs/administration/CLI_tasks/database.md

@@ -159,3 +159,23 @@ Change `default_text_search_config` for database and (if necessary) text_search_
     ```
 
 See [PostgreSQL documentation](https://www.postgresql.org/docs/current/textsearch-configuration.html) and `docs/configuration/howto_search_cjk.md` for more detail.
+
+## Pruning old activities
+
+Over time, transient `Delete` activities and `Tombstone` objects
+can accumulate in your database, inflating its size. This is not ideal. 
+There is a periodic task to prune these transient objects, 
+but on first run this may take a while on older instances to catch up
+to the current day.
+
+=== "OTP"
+
+    ```sh
+    ./bin/pleroma_ctl database prune_task
+    ```
+
+=== "From Source"
+
+    ```sh
+    mix pleroma.database prune_task
+    ```

lib/pleroma/activity/pruner.ex

@@ -17,6 +17,24 @@ def prune_deletes do
     |> Repo.delete_all(timeout: :infinity)
   end
 
+  def prune_undos do
+    before_time = cutoff()
+
+    from(a in Activity,
+      where: fragment("?->>'type' = ?", a.data, "Undo") and a.inserted_at < ^before_time
+    )
+    |> Repo.delete_all(timeout: :infinity)
+  end
+
+  def prune_removes do
+    before_time = cutoff()
+
+    from(a in Activity,
+      where: fragment("?->>'type' = ?", a.data, "Remove") and a.inserted_at < ^before_time
+    )
+    |> Repo.delete_all(timeout: :infinity)
+  end
+
   defp cutoff do
     DateTime.utc_now() |> Timex.shift(days: -@cutoff)
   end

lib/pleroma/workers/cron/database_prune_worker.ex

@@ -15,6 +15,12 @@ def perform(_job) do
     Logger.info("Pruning old deletes")
     ActivityPruner.prune_deletes()
 
+    Logger.info("Pruning old undos")
+    ActivityPruner.prune_undos()
+
+    Logger.info("Pruning old removes")
+    ActivityPruner.prune_removes()
+
     Logger.info("Pruning old tombstone delivery entries")
     ObjectPruner.prune_tombstoned_deliveries()