ML-180: remove backup download feature

Delete ArchiveController, its routes, the maintenance UI backup
button, and the test file. Management scripts and Litestream
supersede this functionality.

lib/music_library_web/controllers/archive_controller.ex

@@ -1,23 +0,0 @@
-defmodule MusicLibraryWeb.ArchiveController do
-  use MusicLibraryWeb, :controller
-
-  # The database path is configuration controlled, and not derived from any
-  # user input, so we can safely skip the check.
-  # sobelow_skip ["Traversal.SendDownload"]
-  def backup(conn, _params) do
-    MusicLibrary.Repo.vacuum()
-
-    database_path = database_path()
-    current_time = DateTime.utc_now()
-    file_name = "music_library_#{DateTime.to_unix(current_time)}.db"
-
-    send_download(conn, {:file, database_path},
-      filename: file_name,
-      content_type: "application/x-sqlite3"
-    )
-  end
-
-  defp database_path do
-    Application.get_env(:music_library, MusicLibrary.Repo)[:database]
-  end
-end

lib/music_library_web/live/maintenance_live/index.ex

@@ -153,9 +153,6 @@ defmodule MusicLibraryWeb.MaintenanceLive.Index do
               >
                 {gettext("Optimize")}
               </.button>
-              <.button href={~p"/backup"}>
-                {gettext("Backup")}
-              </.button>
             </.button_group>
           </li>
         </ul>

lib/music_library_web/router.ex

@@ -63,8 +63,6 @@ defmodule MusicLibraryWeb.Router do
     scope "/" do
       pipe_through :logged_in
 
-      get "/backup", ArchiveController, :backup
-
       get "/assets/:transform_payload", AssetController, :show
 
       live_session :default,
@@ -138,7 +136,6 @@ defmodule MusicLibraryWeb.Router do
     post "/errors/:id/resolve", ErrorController, :resolve
     post "/errors/:id/unresolve", ErrorController, :unresolve
     get "/assets/:transform_payload", AssetController, :show
-    get "/backup", ArchiveController, :backup
   end
 
   if Application.compile_env(:music_library, :monitoring_routes) do