deleteMetadata method
删除缓存条目元数据
Implementation
Future<void> deleteMetadata(String key) async {
final db = await _resolveDatabase();
if (db == null) return;
try {
await _metadataStore.record(key).delete(db);
} catch (e, st) {
LogUtil.v('RxNetDataBase: deleteMetadata error: $e\n$st');
}
}