Method get_ttl_ms

nodedb/src/engine/kv/engine.rs:217–238

GET TTL: Returns the remaining TTL in milliseconds for a key. - `None` — key does not exist (or is expired) - `Some(-1)` — key exists but has no TTL (persistent) - `Some(remaining_ms)` — key exists and expires in `remaining_ms` milliseconds

(
        &self,
        tenant_id: u64,
        collection: &str,
        key: &[u8],
        now_ms: u64,
    )

    /// - `Some(-1)` — key exists but has no TTL (persistent)
    /// - `Some(remaining_ms)` — key exists and expires in `remaining_ms` milliseconds
    pub fn get_ttl_ms(
        &self,
        tenant_id: u64,
        collection: &str,
        key: &[u8],
        now_ms: u64,
    ) -> Option<i64> {
        let tkey = table_key(tenant_id, collection);
        let table = self.tables.get(&tkey)?;

        // First check the key exists and isn't expired.
        table.get(key, now_ms)?;

        // Now get the metadata for TTL info.
        let meta = table.get_entry_meta(key)?;
        if !meta.has_ttl {
            Some(-1)
        } else {
            let remaining = meta.expire_at_ms.saturating_sub(now_ms);
            Some(remaining as i64)
        }
    }

    /// BATCH GET: fetch multiple keys. Returns values in order (None for missing).
    pub fn batch_get(