saveData method
get stored data from local database
key - the key used to store the data
data - string version of the data to be stored
Implementation
@override
Future<dynamic> saveData(String key, String data) async {
final expiresAt = _expiryCache[key] ?? (await _read(key))?['expiresAt'];
return _cacheManager.saveToCache(
key,
jsonEncode(_envelope(data, expiresAt as int?)),
);
}