FlexOptionState

message FlexOptionState {
  FlexOption flex_option = 1;
  Date date = 2;
  int32 open_interest = 3;
  optional int32 previous_open_interest = 4;
  optional int32 open_interest_change = 5;
  Decimal mark = 6;
  optional Decimal previous_mark = 7;
  FlexTickerState ticker_state = 8;
}