Struct SledSnapshotPinRegistry 

pub struct SledSnapshotPinRegistry { /* private fields */ }

Persistent registry of HNSW snapshot block CIDs that must survive GC.

Backed by a dedicated "snapshot_pins" Sled tree inside the blockstore database. Entries survive process restarts, which is critical for ensuring snapshot blocks are never collected by the OrphanGarbageCollector even across node restarts.

Key layout: cid_bytes → label_utf8_bytes

Implementations

impl SledSnapshotPinRegistry

pub fn open(db: &Db) -> Result<Self>

Open (or create) the "snapshot_pins" tree inside the given Sled Db.

pub fn pin(&self, cid: &Cid, label: &str) -> Result<()>

Pin cid with a human-readable label. Idempotent — pinning the same CID again simply overwrites the label.

pub fn unpin(&self, cid: &Cid) -> Result<()>

Remove the pin for cid. No-ops silently if not present.

pub fn is_pinned(&self, cid: &Cid) -> Result<bool>

Return true when cid is registered in this registry.

pub fn list_pinned(&self) -> Result<Vec<(Cid, String)>>

Return all pinned CIDs together with their labels.

pub fn pin_count(&self) -> Result<usize>

Number of CIDs currently pinned in this registry.

pub fn pinned_cid_strings(&self) -> Result<HashSet<String>>

Build a HashSet<String> of pinned CID strings for use with OrphanGarbageCollector.