diff --git a/lib/pleroma/ecto_type/string_id.ex b/lib/pleroma/ecto_type/string_id.ex
new file mode 100644
index 0000000000..a3df5c07e3
--- /dev/null
+++ b/lib/pleroma/ecto_type/string_id.ex
@@ -0,0 +1,23 @@
+defmodule Pleroma.EctoType.StringId do
+  @moduledoc """
+  Stores the value as a number in the database, but represents it as a string.
+  """
+  use Ecto.Type
+
+  def type, do: :id
+
+  def cast(value) do
+    {:ok, to_string(value)}
+  end
+
+  def load(value) do
+    {:ok, to_string(value)}
+  end
+
+  def dump(value) do
+    case Integer.parse(value) do
+      {n, _} -> {:ok, n}
+      _ -> {:error, value}
+    end
+  end
+end
diff --git a/lib/pleroma/rule.ex b/lib/pleroma/rule.ex
index b1db1dc0c5..067d071112 100644
--- a/lib/pleroma/rule.ex
+++ b/lib/pleroma/rule.ex
@@ -11,6 +11,8 @@ defmodule Pleroma.Rule do
   alias Pleroma.Repo
   alias Pleroma.Rule
 
+  @primary_key {:id, Pleroma.EctoType.StringId, autogenerate: true}
+
   schema "rules" do
     field(:priority, :integer, default: 0)
     field(:text, :string)