wombatkv-radix

Block-metadata index, the in-memory and SlateDB-backed indexes that let wombatkv-node answer lookup_block_prefix quickly without hitting S3 for every hash.

What lives here

• block_meta: BlockMeta, BlockHash, InMemoryMetadataIndex, MetadataIndex trait. The L0 hot path.
• slatedb_meta: SlateDbMetadataIndex, the L1 persistent index backed by SlateDB (RFC 0008).

Forbids unsafe_code.

L0 / L1 split

• L0 (InMemoryMetadataIndex): BTreeMap of BlockHash → BlockMeta, rebuilt on every daemon start via bootstrap_world_knowledge (S3 scan) and bootstrap_from_slatedb (fast path).
• L1 (SlateDbMetadataIndex): SlateDB-backed, persists across restarts, scoped by node_id + namespace.

The daemon hydrates L0 from L1 first (fast), then from S3 (slow but authoritative). Block PUTs write through L0 + L1 synchronously so the next lookup_block_prefix sees them.

Test

cargo test -p wombatkv-radix --release