rewriteQueuePayload method
Replaces the payload of the queue entry entryId with payload.
Other fields (retry_count, last_error, operation, created_at,
next_retry_at, synced) are untouched. Throws StateError if no
such entry exists. Atomic with transaction. Added in 0.2.0.
Implementation
@override
Future<void> rewriteQueuePayload(
String entryId,
Map<String, dynamic> payload,
) async {
final i = _queue.indexWhere((e) => e.id == entryId);
if (i < 0) throw StateError('Queue entry $entryId not found');
_queue[i] = _queue[i].copyWith(payload: Map<String, dynamic>.from(payload));
}