updateLsnStmt method
Update this._lsn
to the new value and generate a statement to persist this change
@param lsn new LSN value @returns statement to be executed to save the new LSN value in the database
Implementation
Statement updateLsnStmt(LSN lsn) {
_lsn = lsn;
return _setMetaStatement('lsn', base64.encode(lsn));
}