Method batch_get

nodedb/src/engine/kv/engine.rs:241–251

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

(
        &self,
        tenant_id: u64,
        collection: &str,
        keys: &[Vec<u8>],
        now_ms: u64,
    )

    /// BATCH GET: fetch multiple keys. Returns values in order (None for missing).
    pub fn batch_get(
        &self,
        tenant_id: u64,
        collection: &str,
        keys: &[Vec<u8>],
        now_ms: u64,
    ) -> Vec<Option<Vec<u8>>> {
        keys.iter()
            .map(|k| self.get(tenant_id, collection, k, now_ms))
            .collect()
    }

    /// BATCH PUT: insert/update multiple pairs. Returns count of new keys.
    pub fn batch_put(