lib/mv/membership/import/header_mapper.ex

@@ -97,31 +97,16 @@ defmodule Mv.Membership.Import.HeaderMapper do
   }
 
   # Build reverse map: normalized_variant -> canonical_field
-  # Cached on first access for performance
+  # Computed on each access - the map is small enough that recomputing is fast
+  # This avoids Module.get_attribute issues while maintaining simplicity
   defp normalized_to_canonical do
-    cached = Process.get({__MODULE__, :normalized_to_canonical})
-
-    if cached do
-      cached
-    else
-      map = build_normalized_to_canonical_map()
-      Process.put({__MODULE__, :normalized_to_canonical}, map)
-      map
-    end
-  end
-
-  # Builds the normalized variant -> canonical field map
-  defp build_normalized_to_canonical_map do
     @member_field_variants_raw
-    |> Enum.flat_map(&map_variants_to_normalized/1)
+    |> Enum.flat_map(fn {canonical, variants} ->
-    |> Map.new()
-  end
-
-  # Maps a canonical field and its variants to normalized tuples
-  defp map_variants_to_normalized({canonical, variants}) do
       Enum.map(variants, fn variant ->
         {normalize_header(variant), canonical}
       end)
+    end)
+    |> Map.new()
   end
 
   @doc """
@@ -139,15 +124,8 @@ defmodule Mv.Membership.Import.HeaderMapper do
       iex> HeaderMapper.known_member_fields()
       #MapSet<["email", "firstname", "lastname", "street", "postalcode", "city"]>
   """
-  @spec known_member_fields() :: MapSet.t(String.t())
+  # Known member fields computed at compile-time for performance and determinism
-  def known_member_fields do
+  @known_member_fields @member_field_variants_raw
-    cached = Process.get({__MODULE__, :known_member_fields})
-
-    if cached do
-      cached
-    else
-      fields =
-        @member_field_variants_raw
                        |> Map.keys()
                        |> Enum.map(fn canonical ->
                          # Normalize the canonical field name (e.g., :first_name -> "firstname")
@@ -158,9 +136,9 @@ defmodule Mv.Membership.Import.HeaderMapper do
                        end)
                        |> MapSet.new()
 
-      Process.put({__MODULE__, :known_member_fields}, fields)
+  @spec known_member_fields() :: MapSet.t(String.t())
-      fields
+  def known_member_fields do
-    end
+    @known_member_fields
   end
 
   @doc """

lib/mv_web/live/global_settings_live.ex

@@ -48,6 +48,7 @@ defmodule MvWeb.GlobalSettingsLive do
   alias Mv.Membership
   alias Mv.Membership.Import.MemberCSV
   alias MvWeb.Authorization
+  alias Mv.Config
 
   on_mount {MvWeb.LiveHelpers, :ensure_user_role_loaded}
 
@@ -140,14 +141,6 @@ defmodule MvWeb.GlobalSettingsLive do
                   "Use the custom field name as the CSV column header (same normalization as member fields applies)"
                 )}
               </p>
-              <div class="mt-2">
-                <.link
-                  navigate={~p"/custom_field_values"}
-                  class="link link-primary"
-                >
-                  {gettext("Manage Custom Fields")}
-                </.link>
-              </div>
             </div>
           </div>
 
@@ -209,6 +202,7 @@ defmodule MvWeb.GlobalSettingsLive do
               phx-disable-with={gettext("Starting import...")}
               variant="primary"
               disabled={
+                @import_status == :running or
                   Enum.empty?(@uploads.csv_file.entries) or
                   @uploads.csv_file.entries |> List.first() |> then(&(&1 && not &1.done?))
               }
@@ -226,7 +220,7 @@ defmodule MvWeb.GlobalSettingsLive do
                 class="mt-4"
                 data-testid="import-progress-container"
               >
-                <%= if @import_status == :running do %>
+                <%= if @import_progress.status == :running do %>
                   <p class="text-sm" data-testid="import-progress-text">
                     {gettext("Processing chunk %{current} of %{total}...",
                       current: @import_progress.current_chunk,
@@ -235,7 +229,7 @@ defmodule MvWeb.GlobalSettingsLive do
                   </p>
                 <% end %>
 
-                <%= if @import_status == :done do %>
+                <%= if @import_progress.status == :done do %>
                   <section class="space-y-4" data-testid="import-results-panel">
                     <h2 class="text-lg font-semibold">
                       {gettext("Import Results")}
@@ -372,6 +366,15 @@ defmodule MvWeb.GlobalSettingsLive do
   def handle_event("start_import", _params, socket) do
     # Server-side admin check
     if Authorization.can?(socket.assigns[:current_user], :create, Mv.Membership.Member) do
+      # Prevent concurrent imports
+      if socket.assigns.import_status == :running do
+        {:noreply,
+         put_flash(
+           socket,
+           :error,
+           gettext("Import is already running. Please wait for it to complete.")
+         )}
+      else
         # Check if upload is completed
         upload_entries = socket.assigns.uploads.csv_file.entries
 
@@ -398,7 +401,8 @@ defmodule MvWeb.GlobalSettingsLive do
                     warnings: import_state.warnings || [],
                     status: :running,
                     current_chunk: 0,
-                  total_chunks: total_chunks
+                    total_chunks: total_chunks,
+                    errors_truncated?: false
                   }
 
                   socket =
@@ -460,6 +464,7 @@ defmodule MvWeb.GlobalSettingsLive do
              )}
           end
         end
+      end
     else
       {:noreply,
        put_flash(
@@ -576,6 +581,7 @@ defmodule MvWeb.GlobalSettingsLive do
   end
 
   # Starts async task to process a chunk
+  # In tests (SQL sandbox mode), runs synchronously to avoid Ecto Sandbox issues
   defp start_chunk_processing_task(socket, import_state, progress, idx) do
     chunk = Enum.at(import_state.chunks, idx)
     actor = socket.assigns[:current_user]
@@ -589,21 +595,33 @@ defmodule MvWeb.GlobalSettingsLive do
       actor: actor
     ]
 
-    # Start async task to process chunk
+    if Config.sql_sandbox?() do
-    Task.Supervisor.async_nolink(Mv.TaskSupervisor, fn ->
+      # Run synchronously in tests to avoid Ecto Sandbox issues with async tasks
-      case MemberCSV.process_chunk(
+      {:ok, chunk_result} =
+        MemberCSV.process_chunk(
           chunk,
           import_state.column_map,
           import_state.custom_field_map,
           opts
-           ) do
+        )
-        {:ok, chunk_result} ->
-          send(live_view_pid, {:chunk_done, idx, chunk_result})
 
-        {:error, reason} ->
+      # In test mode, send the message - it will be processed when render() is called
-          send(live_view_pid, {:chunk_error, idx, reason})
+      # in the test. The test helper wait_for_import_completion() handles message processing
-      end
+      send(live_view_pid, {:chunk_done, idx, chunk_result})
+    else
+      # Start async task to process chunk in production
+      Task.Supervisor.async_nolink(Mv.TaskSupervisor, fn ->
+        {:ok, chunk_result} =
+          MemberCSV.process_chunk(
+            chunk,
+            import_state.column_map,
+            import_state.custom_field_map,
+            opts
+          )
+
+        send(live_view_pid, {:chunk_done, idx, chunk_result})
       end)
+    end
 
     {:noreply, socket}
   end
@@ -670,10 +688,10 @@ defmodule MvWeb.GlobalSettingsLive do
       end
     end)
     |> case do
-      [{_name, {:ok, content}}] when is_binary(content) ->
+      [{:ok, content}] when is_binary(content) ->
         {:ok, content}
 
-      [{_name, {:error, reason}}] ->
+      [{:error, reason}] ->
         {:error, gettext("Failed to read file: %{reason}", reason: reason)}
 
       [] ->

test/fixtures/csv_with_bom_semicolon.csv

@@ -1,3 +1,8 @@
 first_name;last_name;email;street;postal_code;city
 Alice;Smith;alice.smith@example.com;Main Street 1;12345;Berlin
 
+
+
+
+
+

test/fixtures/csv_with_empty_lines.csv

@@ -4,3 +4,8 @@ Alice;Smith;alice.smith@example.com;Main Street 1;12345;Berlin
 Bob;Johnson;invalid-email;Park Avenue 2;54321;Munich
 
 
+
+
+
+
+

test/fixtures/csv_with_unknown_custom_field.csv

@@ -3,3 +3,8 @@ Alice;Smith;alice.smith@example.com;Main Street 1;12345;Berlin;SomeValue
 Bob;Johnson;bob.johnson@example.com;Park Avenue 2;54321;Munich;AnotherValue
 
 
+
+
+
+
+

test/fixtures/invalid_member_import.csv

@@ -3,3 +3,8 @@ Alice;Smith;invalid-email;Main Street 1;12345;Berlin
 Bob;Johnson;;Park Avenue 2;54321;Munich
 
 
+
+
+
+
+

test/fixtures/valid_member_import.csv

@@ -3,3 +3,8 @@ Alice;Smith;alice.smith@example.com;Main Street 1;12345;Berlin
 Bob;Johnson;bob.johnson@example.com;Park Avenue 2;54321;Munich
 
 
+
+
+
+
+