Method append_surrogate_alloc

nodedb/src/wal/manager/append.rs:202–211

Append a `SurrogateAlloc` high-watermark record. Emitted by `SurrogateRegistry::flush` (every 1024 allocations or 200 ms, whichever first) so the global surrogate counter is crash-recoverable independent of the redb `_system.surrogate_hwm` row. `vshard_id` is `0` — the surrogate hwm is a node-global allocator counter, not sharded user data.

(&self, hi: u32)

    /// row. `vshard_id` is `0` — the surrogate hwm is a node-global
    /// allocator counter, not sharded user data.
    pub fn append_surrogate_alloc(&self, hi: u32) -> crate::Result<Lsn> {
        let payload = nodedb_wal::record::SurrogateAllocPayload::new(hi).to_bytes();
        self.append_record(
            RecordType::SurrogateAlloc,
            TenantId::new(0),
            VShardId::new(0),
            DatabaseId::DEFAULT,
            &payload,
        )
    }

    /// Append a `SurrogateBind` record. Emitted by
    /// `SurrogateAssigner::assign` immediately after the catalog