Module snapshot 

Structs

SnapshotCadence

How often the maintenance task writes an anchor (§5.5).

Functions

cleanup_expired_snapshots

Retention: the newest RETAIN, plus one per day for RETAIN_DAYS (§5.5, D-054).

load_snapshot

Load a snapshot, refusing anything this build cannot read (§5.5, D-043).

save_snapshot

Save a bincode-serialized, zstd-compressed snapshot file (.snap.zst) (§5.5).

write_final

Write the final snapshot on clean shutdown (§5.1.7).