I am working on a Rust project where I store a BeaconInfoEventContent struct in a BTreeMap. Here is my current implementation:

pub struct BeaconInfoEventContent {
    pub live: bool,
    pub ts: MilliSecondsSinceUnixEpoch,
    pub timeout: Duration,
}

impl BeaconInfoEventContent {
    pub fn new(
        timeout: Duration,
        live: bool,
        ts: Option<MilliSecondsSinceUnixEpoch>,
    ) -> Self {
        Self {
            live,
            ts: ts.unwrap_or_else(MilliSecondsSinceUnixEpoch::now),
            timeout,
        }
    }

    pub fn is_live(&self) -> bool {
        self.live
            && self
                .ts
                .to_system_time()
                .and_then(|t| t.checked_add(self.timeout))
                .is_some_and(|t| t > SystemTime::now())
    }
}


ExampleStruct {
   ...
   pub(crate) beacons: BTreeMap<OwnedUserId, BeaconInfoEventContent>,
   ....
}

I need to automatically update the BeaconInfoEventContent‘s live field when the duration expires. Is there a proper approach to this besides constant polling at a specific interval?