Entry::updateChildPageUris() empty($ids) check never short-circuits → every structured-entry save rewrites URIs for the entire collection

[SUXUMI]

Bug description

Statamic\Entries\Entry::updateChildPageUris() contains an empty-check that can never be true:

// vendor/statamic/cms/src/Entries/Entry.php (6.x:511, 5.x:482)
if (empty($ids = $page->flattenedPages()->pluck('id'))) {
    return;
} 

// vendor/statamic/eloquent-driver/src/Entries/EntryRepository.php:98
public function updateUris($collection, $ids = null)
{
    $ids = collect($ids);

    $collection->queryEntries()
        ->when($ids->isNotEmpty(), fn ($query) => $query->whereIn('id', $ids))
        ->get()
        ->each(fn ($entry) => $entry->model()->update(['uri' => $entry->uri()]));
}

With an empty $ids, $ids->isNotEmpty() is false → whereIn is skipped → every entry in the collection is loaded, each URI is recomputed (walking ancestors), and a per-entry UPDATE is issued.

Observed performance impact on a non-trivial project (44 locales, news collection with 6k+ entries): every saveQuietly() on a structured news entry spends more than 26 seconds in updateChildPageUris with a ~650 MB.

How to reproduce

1. Laravel + Statamic v6 + statamic/eloquent-driver:"^5.0".
2. Create a structured collection
3. Seed entries
4. Pick a leaf entry $leaf that has NO child pages in the structure. Confirm: $leaf->page()->flattenedPages()->count() === 0.
5. Mutate the slug (any change that passes shouldUpdateUris()):

Environment

- Statamic version: 6.14.0 (also present on 5.x branch line 482)                                                                                                                                             
- Laravel version: 12.56.0                                                                                                                                                                                                                             
- PHP version: 8.4.19                                                                                                                                                                                                                                  
- statamic/eloquent-driver: 5.6.3 (entries driver set to eloquent; collections driver file)
- DB: MySQL 8                                                                                                                                                                                                                                          
- OS: macOS 26.4

Installation

Existing Laravel app