StartOffsetFlag specifies the start offset.
Enumeration value list
LATEST: specifies to use the time when the channel is created as the start time.
EARLIEST: specifies to use the time when the earliest stream log is generated as the start time. By default, stream logs expire after seven days. In most cases, the start time is set to seven days ago.
enum StartOffsetFlag {
LATEST = 0;
EARLIEST = 1;
}