deleteExpiredKeys method

@override Future<bool> deleteExpiredKeys()

Removes all expired keys. Deletes are local-only — they are NOT appended to the commit log, so an expiry sweep never advances the local commitId and never propagates to other secondaries via sync. Expiry is treated as backend maintenance, not a sync-worthy mutation; clients drop expired keys independently using their own TTL bookkeeping.

Implementation

@override
Future<bool> deleteExpiredKeys() async {
  final keys = await (await getExpiredKeys()).toList();
  for (final k in keys) {
    await remove(k, skipCommit: true);
  }
  return true;
}