Method tick_expiry

nodedb/src/engine/kv/engine_stats.rs:56–74

Advance the expiry wheel and reap expired keys. Call this from the TPC core's event loop at the configured tick interval. Returns a list of `(tenant_id, collection, key)` for each reaped key, enabling the caller to produce WAL tombstones and CDC/keyspace events.

(&mut self, now_ms: u64)

    /// Returns a list of `(tenant_id, collection, key)` for each reaped key,
    /// enabling the caller to produce WAL tombstones and CDC/keyspace events.
    pub fn tick_expiry(&mut self, now_ms: u64) -> Vec<ExpiredKey> {
        let batch = self.expiry.tick(now_ms);
        let mut reaped = Vec::new();

        for (composite_key, expire_at_ms) in &batch.expired {
            if let Some((tid, collection, key)) = parse_expiry_key(composite_key)
                && let Some(table) = self.tables.get_mut(&table_key(tid, &collection))
                && table.reap_expired(&key, *expire_at_ms)
            {
                reaped.push(ExpiredKey {
                    tenant_id: tid,
                    collection,
                    key,
                });
            }
        }

        reaped
    }

    /// Number of entries tracked in the expiry wheel.
    pub fn expiry_queue_depth(&self) -> usize {