add null object purger

priv/repo/migrations/20220806014830_remove_null_objects.exs

@@ -0,0 +1,13 @@
+defmodule Pleroma.Repo.Migrations.RemoveNullObjects do
+  use Ecto.Migration
+
+  def up do
+    statement = """
+    DELETE FROM objects
+    WHERE (data->>'type') is null;
+    """
+    execute(statement)
+  end
+
+  def down, do: :ok
+end