fix: fixed CSM-008

CODESMELL.md

@@ -151,14 +151,19 @@
 
 ---
 
-### CSM-008 — DB Queries During Render Path
-- **Files:** `lib/bds/desktop/shell_live/panel_renderer.ex`, `lib/bds/desktop/shell_live/tab_helpers.ex`
-- **What:**
-  - `panel_renderer.ex:199-209` — `post_link_entries/1` calls `PostLinks.list_incoming_links/1` and `Posts.get_post/1` per link during render.
-  - `panel_renderer.ex:229-240` — `git_log_entries/1` calls `Git.file_history/2` and `Posts.get_post/1` during render.
-  - `tab_helpers.ex:120-135` — `derived_tab_meta/1` queries posts, media, scripts, templates, chat conversations, and import definitions from within the render-prep path.
-- **Fix:** Move all data fetching into event handlers (`handle_event`) or the decomposed `reload_shell` updaters from CSM-007. Pre-compute link entries and git log entries when a tab becomes active and store them in assigns. Render should be a pure function of assigns.
-- **Test:** Render a panel 10 times; assert no DB queries fire on re-renders.
+### ~~CSM-008 — DB Queries During Render Path~~ ✅ FIXED
+- **Fixed:** 2026-05-09
+- **What was done:**
+  - **Panel renderer** (`lib/bds/desktop/shell_live/panel_renderer.ex`):
+    - `render_post_links` and `render_git_log` no longer call DB functions during render. Instead they read from pre-computed assigns (`panel_post_links`, `panel_git_entries`).
+    - Renamed `post_link_entries/1` → `fetch_post_link_entries/1` and `git_log_entries/1` → `fetch_git_log_entries/1`, made them public for use by event handlers.
+  - **Shell LiveView** (`lib/bds/desktop/shell_live.ex`):
+    - Added `refresh_panel_data/1` that fetches panel data (post links or git log) based on the active panel tab and stores results in assigns.
+    - `refresh_layout/2` detects when `current_tab` or `panel.active_tab` changed and calls `refresh_panel_data/1` only when stale — no DB queries on re-renders.
+    - Initialized `panel_post_links` and `panel_git_entries` assigns in mount.
+  - **Tab meta** (`lib/bds/desktop/shell_live/tab_helpers.ex`):
+    - `sync_tab_meta` now skips `derived_tab_meta` DB queries when existing meta already has both title and subtitle populated (`meta_complete?/1` guard).
+  - Added 5 tests in `test/bds/csm008_render_path_test.exs`: post_links re-render (0 queries), git_log re-render (0 queries), output panel switch (0 queries), tasks panel switch (0 queries), tab meta skip for complete meta (0 queries).
 
 ---
 
@@ -425,6 +430,7 @@
 - [ ] All high-severity items (CSM-006 to CSM-010) have been addressed.
   - CSM-006: Fixed. Batch INSERT for reindexing, preloaded post records for rendering.
   - CSM-007: Fixed. Decomposed into refresh_layout, refresh_sidebar, refresh_content, reload_shell.
+  - CSM-008: Fixed. Panel data pre-computed in event handlers, tab meta skips DB for complete entries.
 - [x] CSM-001 fix covers ALL 6 affected files, not just `import_definitions.ex`.
 - [x] CSM-003 fix covers ALL `Repo.delete!` call sites (posts, tags, scripts, media, projects, templates, translations).
 - [x] CSM-007 decomposition is the prerequisite for fixing CSM-008 (render-path queries).

lib/bds/desktop/shell_live.ex

@@ -33,6 +33,7 @@ defmodule BDS.Desktop.ShellLive do
   alias BDS.Desktop.ShellLive.{
     ChatSurface,
     Layout,
+    PanelRenderer,
     SessionUtil,
     ShellCommandRunner,
     SidebarCreate,
@@ -171,6 +172,8 @@ defmodule BDS.Desktop.ShellLive do
      |> assign(:chat_editor_request_refs, %{})
      |> assign(:shell_overlay, nil)
      |> assign(:output_entries, [])
+     |> assign(:panel_post_links, %{backlinks: [], outlinks: []})
+     |> assign(:panel_git_entries, [])
      |> reload_shell(workbench)
      |> tap(&sync_menu_bar_locale/1)}
   end
@@ -567,7 +570,15 @@ defmodule BDS.Desktop.ShellLive do
     page_language = socket.assigns[:page_language] || ShellData.ui_language()
     offline_mode = Map.get(socket.assigns, :offline_mode, true)
     sidebar_data = socket.assigns[:sidebar_data] || %{}
+    current_tab = current_tab(workbench)
+    prev_tab = socket.assigns[:current_tab]
+    prev_panel_tab =
+      case socket.assigns[:workbench] do
+        %Workbench{panel: %{active_tab: tab}} -> tab
+        _ -> nil
+      end
 
+    socket =
       socket
       |> assign(:workbench, workbench)
       |> assign(:activity_buttons, activity_buttons)
@@ -576,7 +587,7 @@ defmodule BDS.Desktop.ShellLive do
         active_sidebar_label(activity_buttons, workbench.active_view, sidebar_data)
       )
       |> assign(:panel_tabs, ShellData.panel_tabs(workbench))
-    |> assign(:current_tab, current_tab(workbench))
+      |> assign(:current_tab, current_tab)
       |> assign(:editor_meta, ShellData.editor_meta(task_status))
       |> assign(
         :status,
@@ -585,6 +596,36 @@ defmodule BDS.Desktop.ShellLive do
           offline_mode: offline_mode
         )
       )
+
+    if panel_data_stale?(current_tab, prev_tab, workbench.panel.active_tab, prev_panel_tab) do
+      refresh_panel_data(socket)
+    else
+      socket
+    end
+  end
+
+  defp panel_data_stale?(current_tab, prev_tab, panel_tab, prev_panel_tab) do
+    current_tab != prev_tab or panel_tab != prev_panel_tab
+  end
+
+  defp refresh_panel_data(socket) do
+    panel_tab = socket.assigns.workbench.panel.active_tab
+
+    socket
+    |> assign(
+      :panel_post_links,
+      if(panel_tab == :post_links,
+        do: PanelRenderer.fetch_post_link_entries(socket.assigns),
+        else: socket.assigns[:panel_post_links] || %{backlinks: [], outlinks: []}
+      )
+    )
+    |> assign(
+      :panel_git_entries,
+      if(panel_tab == :git_log,
+        do: PanelRenderer.fetch_git_log_entries(socket.assigns),
+        else: socket.assigns[:panel_git_entries] || []
+      )
+    )
   end
 
   defp refresh_sidebar(socket, workbench) do

lib/bds/desktop/shell_live/panel_renderer.ex

@@ -105,12 +105,12 @@ defmodule BDS.Desktop.ShellLive.PanelRenderer do
   end
 
   defp render_post_links(assigns) do
-    links = post_link_entries(assigns)
+    panel_links = assigns[:panel_post_links] || %{backlinks: [], outlinks: []}
 
     assigns =
       assigns
-      |> assign(:backlinks, Map.get(links, :backlinks, []))
-      |> assign(:outlinks, Map.get(links, :outlinks, []))
+      |> assign(:backlinks, Map.get(panel_links, :backlinks, []))
+      |> assign(:outlinks, Map.get(panel_links, :outlinks, []))
 
     ~H"""
     <%= if Enum.empty?(@backlinks) and Enum.empty?(@outlinks) do %>
@@ -161,7 +161,7 @@ defmodule BDS.Desktop.ShellLive.PanelRenderer do
   end
 
   defp render_git_log(assigns) do
-    entries = git_log_entries(assigns)
+    entries = assigns[:panel_git_entries] || []
     assigns = assign(assigns, :git_entries, entries)
 
     ~H"""
@@ -196,7 +196,7 @@ defmodule BDS.Desktop.ShellLive.PanelRenderer do
     """
   end
 
-  defp post_link_entries(assigns) do
+  def fetch_post_link_entries(assigns) do
     case assigns.current_tab do
       %{type: :post, id: post_id} ->
         %{
@@ -226,7 +226,7 @@ defmodule BDS.Desktop.ShellLive.PanelRenderer do
     |> Enum.reject(&is_nil/1)
   end
 
-  defp git_log_entries(assigns) do
+  def fetch_git_log_entries(assigns) do
     case git_history_target(assigns.current_tab) do
       nil ->
         []

lib/bds/desktop/shell_live/tab_helpers.ex

@@ -30,7 +30,13 @@ defmodule BDS.Desktop.ShellLive.TabHelpers do
     Enum.reduce(tabs, %{}, fn tab, acc ->
       key = {tab.type, tab.id}
       existing_meta = Map.get(tab_meta, key, %{})
-      synced_meta = merge_missing_meta(existing_meta, derived_tab_meta(tab))
+
+      synced_meta =
+        if meta_complete?(existing_meta) do
+          existing_meta
+        else
+          merge_missing_meta(existing_meta, derived_tab_meta(tab))
+        end
 
       if map_size(synced_meta) == 0 do
         acc
@@ -198,6 +204,12 @@ defmodule BDS.Desktop.ShellLive.TabHelpers do
 
   defp derived_tab_meta(_tab), do: %{}
 
+  defp meta_complete?(%{title: title, subtitle: subtitle})
+       when is_binary(title) and title != "" and is_binary(subtitle) and subtitle != "",
+       do: true
+
+  defp meta_complete?(_), do: false
+
   defp merge_missing_meta(existing_meta, fresh_meta) do
     existing_meta
     |> maybe_put_missing(:title, Map.get(fresh_meta, :title))

test/bds/csm008_render_path_test.exs

@@ -0,0 +1,179 @@
+defmodule BDS.CSM008RenderPathTest do
+  use ExUnit.Case, async: false
+
+  import Phoenix.ConnTest
+  import Phoenix.LiveViewTest
+
+  @endpoint BDS.Desktop.Endpoint
+
+  setup do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(BDS.Repo)
+
+    temp_dir =
+      Path.join(System.tmp_dir!(), "bds-csm008-#{System.unique_integer([:positive])}")
+
+    File.mkdir_p!(temp_dir)
+    on_exit(fn -> File.rm_rf(temp_dir) end)
+
+    {:ok, project} = BDS.Projects.create_project(%{name: "CSM008", data_path: temp_dir})
+
+    {:ok, post} =
+      BDS.Posts.create_post(%{
+        project_id: project.id,
+        title: "CSM008 Test Post",
+        slug: "csm008-test",
+        status: :draft,
+        language: "en"
+      })
+
+    %{project: project, post: post}
+  end
+
+  describe "panel re-renders fire no DB queries" do
+    test "post_links panel re-render uses cached assigns", %{post: post} do
+      {:ok, view, _html} = live_isolated(build_conn(), BDS.Desktop.ShellLive)
+
+      render_click(view, "select_tab", %{"type" => "post", "id" => post.id})
+      render_click(view, "select_panel_tab", %{"tab" => "post_links"})
+
+      query_count = count_queries(fn ->
+        1..10 |> Enum.each(fn _ -> render(view) end)
+      end)
+
+      assert query_count == 0,
+        "Expected 0 DB queries on panel re-renders, got #{query_count}"
+    end
+
+    test "git_log panel re-render uses cached assigns", %{post: post} do
+      {:ok, view, _html} = live_isolated(build_conn(), BDS.Desktop.ShellLive)
+
+      render_click(view, "select_tab", %{"type" => "post", "id" => post.id})
+      render_click(view, "select_panel_tab", %{"tab" => "git_log"})
+
+      query_count = count_queries(fn ->
+        1..10 |> Enum.each(fn _ -> render(view) end)
+      end)
+
+      assert query_count == 0,
+        "Expected 0 DB queries on git_log re-renders, got #{query_count}"
+    end
+  end
+
+  describe "select_panel_tab triggers panel data fetch only for active panel" do
+    test "switching to output panel triggers no post/media queries" do
+      {:ok, view, _html} = live_isolated(build_conn(), BDS.Desktop.ShellLive)
+
+      {query_count, query_sources} = count_queries_with_sources(fn ->
+        render_click(view, "select_panel_tab", %{"tab" => "output"})
+      end)
+
+      refute "post_links" in query_sources,
+        "Switching to output should not query post_links, got: #{inspect(query_sources)}"
+
+      assert query_count == 0,
+        "Expected 0 queries for output panel tab, got #{query_count}"
+    end
+
+    test "switching to tasks panel triggers no post/media queries" do
+      {:ok, view, _html} = live_isolated(build_conn(), BDS.Desktop.ShellLive)
+
+      {query_count, _query_sources} = count_queries_with_sources(fn ->
+        render_click(view, "select_panel_tab", %{"tab" => "tasks"})
+      end)
+
+      assert query_count == 0,
+        "Expected 0 queries for tasks panel tab, got #{query_count}"
+    end
+  end
+
+  describe "sync_tab_meta skips DB queries for complete meta" do
+    test "tabs with existing title and subtitle skip DB queries", %{post: post} do
+      {:ok, view, _html} = live_isolated(build_conn(), BDS.Desktop.ShellLive)
+
+      render_click(view, "open_sidebar_item", %{
+        "route" => "post",
+        "id" => post.id,
+        "title" => "Preset Title",
+        "subtitle" => "preset subtitle"
+      })
+
+      query_count = count_queries(fn ->
+        render_click(view, "select_tab", %{"type" => "post", "id" => post.id})
+      end)
+
+      assert query_count == 0,
+        "Expected 0 DB queries when tab meta is already complete, got #{query_count}"
+    end
+  end
+
+  defp count_queries(func) do
+    test_pid = self()
+    ref = make_ref()
+    handler_id = "csm008-query-counter-#{inspect(ref)}"
+
+    :telemetry.attach(
+      handler_id,
+      [:bds, :repo, :query],
+      fn _event, _measurements, _metadata, _ ->
+        send(test_pid, {:query_executed, ref})
+      end,
+      nil
+    )
+
+    func.()
+
+    :telemetry.detach(handler_id)
+    count_messages(ref, 0)
+  end
+
+  defp count_queries_with_sources(func) do
+    test_pid = self()
+    ref = make_ref()
+    handler_id = "csm008-query-sources-#{inspect(ref)}"
+
+    :telemetry.attach(
+      handler_id,
+      [:bds, :repo, :query],
+      fn _event, _measurements, metadata, _ ->
+        source = metadata[:source] || extract_table(metadata[:query] || "")
+        send(test_pid, {:query_executed, ref, source})
+      end,
+      nil
+    )
+
+    func.()
+
+    :telemetry.detach(handler_id)
+    collect_query_sources(ref, 0, [])
+  end
+
+  defp collect_query_sources(ref, count, sources) do
+    receive do
+      {:query_executed, ^ref, source} ->
+        collect_query_sources(ref, count + 1, [source | sources])
+    after
+      0 -> {count, Enum.uniq(sources)}
+    end
+  end
+
+  defp extract_table(query) when is_binary(query) do
+    cond do
+      String.contains?(query, "post_links") -> "post_links"
+      String.contains?(query, "posts") -> "posts"
+      String.contains?(query, "media") -> "media"
+      String.contains?(query, "scripts") -> "scripts"
+      String.contains?(query, "templates") -> "templates"
+      true -> "other"
+    end
+  end
+
+  defp extract_table(_), do: "unknown"
+
+  defp count_messages(ref, acc) do
+    receive do
+      {:query_executed, ^ref} -> count_messages(ref, acc + 1)
+    after
+      0 -> acc
+    end
+  end
+end