Method update

nodedb/src/engine/timeseries/last_value_cache.rs:49–62

Update the cache for a series. Only updates if `ts >= cached_ts`. Returns `true` if the entry was updated (new or newer timestamp).

(&mut self, series_id: SeriesId, ts: i64, value: f64)

    ///
    /// Returns `true` if the entry was updated (new or newer timestamp).
    pub fn update(&mut self, series_id: SeriesId, ts: i64, value: f64) -> bool {
        match self.entries.get_mut(&series_id) {
            Some(entry) if ts >= entry.ts => {
                entry.ts = ts;
                entry.value = value;
                true
            }
            Some(_) => false, // Older timestamp, skip.
            None => {
                self.entries.insert(series_id, LastValueEntry { ts, value });
                true
            }
        }
    }

    /// O(1) lookup of the last value for a series.
    pub fn get(&self, series_id: SeriesId) -> Option<&LastValueEntry> {