Function loadSessionTimeSpan

app/src/Sessions/ReportData.cpp:523–535

* @brief Returns the session's earliest and latest @c timestamp_ns values. */

 * @brief Returns the session's earliest and latest @c timestamp_ns values.
 */
static std::pair<qint64, qint64> loadSessionTimeSpan(QSqlDatabase& db, int sessionId)
{
  QSqlQuery q(db);
  q.prepare("SELECT MIN(timestamp_ns), MAX(timestamp_ns) FROM readings WHERE session_id = ?");
  q.bindValue(0, sessionId);

  if (!q.exec() || !q.next()) {
    qWarning() << "[Sessions::ReportData] time-span query failed:" << q.lastError().text();
    return {0, 0};
  }

  return {q.value(0).toLongLong(), q.value(1).toLongLong()};
}

/**
 * @brief Numeric-sample count per parameter, keyed by @c unique_id.