pruneOrphaned method
Remove all metadata for files that no longer exist.
Returns the list of region names that were pruned.
Implementation
Future<List<String>> pruneOrphaned() async {
final orphaned = await getOrphanedRegions();
for (final region in orphaned) {
await remove(region);
debugPrint('[MwmStorage] Pruned orphaned metadata for: $region');
}
return orphaned;
}