send back null for wiped dataclips

CHANGELOG.md

@@ -21,6 +21,13 @@ and this project adheres to
 
 ### Fixed
 
+## [v2.14.8-pre1] - 2025-10-01
+
+### Fixed
+
+- Send back `null` if a requested dataclip has been wiped
+  [PR#3652](https://github.com/OpenFn/lightning/pull/3652)
+
 ## [v2.14.8-pre] - 2025-10-01
 
 ### Fixed

lib/lightning/dataclip_scrubber.ex

@@ -12,10 +12,12 @@ defmodule Lightning.DataclipScrubber do
   alias Lightning.Scrubber
 
   @spec scrub_dataclip_body!(%{
-          body: String.t(),
+          body: String.t() | nil,
           type: atom(),
           id: Ecto.UUID.t()
-        }) :: String.t()
+        }) :: String.t() | nil
+  def scrub_dataclip_body!(%{body: nil}), do: nil
+
   def scrub_dataclip_body!(%{body: body} = dataclip) when is_binary(body) do
     if dataclip.type == :step_result do
       step_query = from s in Step, where: s.output_dataclip_id == ^dataclip.id

lib/lightning_web/controllers/dataclip_controller.ex

@@ -64,7 +64,7 @@ defmodule LightningWeb.DataclipController do
     |> put_resp_header("vary", "Accept-Encoding, Cookie")
     |> put_resp_header("cache-control", "private, max-age=#{@max_age}")
     |> put_resp_header("last-modified", to_rfc1123!(dataclip.updated_at))
-    |> send_resp(200, body)
+    |> send_resp(200, body || "null")
   end
 
   defp dataclip_is_modified?(dataclip, last_modified) do

mix.exs

@@ -4,7 +4,7 @@ defmodule Lightning.MixProject do
   def project do
     [
       app: :lightning,
-      version: "2.14.8-pre",
+      version: "2.14.8-pre1",
       elixir: "~> 1.18",
       elixirc_paths: elixirc_paths(Mix.env()),
       elixirc_options: [