diff --git a/include/nc_legacy_reset.inc.php b/include/nc_legacy_reset.inc.php
new file mode 100644
index 0000000..cdf6f85
--- /dev/null
+++ b/include/nc_legacy_reset.inc.php
@@ -0,0 +1,115 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_nc_legacy_remove_tree($path, $allowed_root)
+{
+  $path = rtrim(str_replace('\\', '/', (string)$path), '/');
+  $allowed_root = rtrim(str_replace('\\', '/', (string)$allowed_root), '/');
+  if ($path === '' || $allowed_root === '' || $path === $allowed_root || strpos($path, $allowed_root.'/') !== 0)
+  {
+    return 0;
+  }
+  if (!file_exists($path) && !is_link($path)) return 0;
+
+  if (is_link($path) || is_file($path))
+  {
+    return @unlink($path) ? 1 : 0;
+  }
+
+  $removed = 0;
+  $items = @scandir($path);
+  if (is_array($items))
+  {
+    foreach ($items as $item)
+    {
+      if ($item === '.' || $item === '..') continue;
+      $removed += bratonien_tools_nc_legacy_remove_tree($path.'/'.$item, $allowed_root);
+    }
+  }
+  if (@rmdir($path)) $removed++;
+  return $removed;
+}
+
+function bratonien_tools_nc_legacy_remove_state_files($state_root)
+{
+  $removed = 0;
+  foreach (glob(rtrim($state_root, '/').'/connection-*') ?: array() as $connection_dir)
+  {
+    if (!is_dir($connection_dir)) continue;
+    foreach (array('webdav-map.json', 'webdav-manifest.tsv', 'webdav-shadow-map.json') as $name)
+    {
+      $path = $connection_dir.'/'.$name;
+      if (is_file($path) && @unlink($path)) $removed++;
+    }
+  }
+  return $removed;
+}
+
+function bratonien_tools_nc_reset_legacy_imports()
+{
+  include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
+
+  $ids = array();
+  $result = pwg_query(
+    "SELECT id FROM ".IMAGES_TABLE.
+    " WHERE path LIKE '%nc-webdav-source/connection-%'"
+  );
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    $ids[] = (int)$row['id'];
+  }
+
+  if ($ids)
+  {
+    delete_elements($ids, false);
+  }
+
+  $data_root = rtrim(PHPWG_ROOT_PATH, '/').'/_data';
+  $tool_root = $data_root.'/bratonien-tools';
+  $removed_files = 0;
+  foreach (array(
+    $tool_root.'/nc-webdav-source',
+    $tool_root.'/nc-webdav-preview',
+    $tool_root.'/nc-webdav-gallery',
+  ) as $generated_root)
+  {
+    $removed_files += bratonien_tools_nc_legacy_remove_tree($generated_root, $data_root);
+  }
+
+  if (defined('PWG_DERIVATIVE_DIR'))
+  {
+    $derivative_root = rtrim(PHPWG_ROOT_PATH.PWG_DERIVATIVE_DIR, '/');
+    foreach (array(
+      $derivative_root.'/_data/bratonien-tools/nc-webdav-source',
+      $derivative_root.'/_data/bratonien-tools/nc-webdav-gallery',
+    ) as $generated_derivative_root)
+    {
+      $removed_files += bratonien_tools_nc_legacy_remove_tree($generated_derivative_root, $derivative_root);
+    }
+  }
+
+  $removed_state_files = bratonien_tools_nc_legacy_remove_state_files($tool_root.'/nc-connector-state');
+
+  if ($ids)
+  {
+    update_category('all');
+    invalidate_user_cache(true);
+  }
+
+  $result = array(
+    'timestamp'=>time(),
+    'removed_image_records'=>count($ids),
+    'removed_generated_entries'=>$removed_files,
+    'removed_state_files'=>$removed_state_files,
+  );
+
+  if (function_exists('conf_update_param'))
+  {
+    conf_update_param('bratonien_nc_legacy_reset_0977', json_encode($result));
+  }
+
+  return $result;
+}