src/sync-state.proto

message SyncState
{
  required bytes name = 1;

  enum ActionType
  {
    UPDATE = 0;
    DELETE = 1;
  }
  required ActionType type = 2;

  optional uint64 seq = 3;
  optional bytes locator = 4;
}

message SyncStateMsg
{
  repeated SyncState state = 1;
}