Module snapshot 

DB snapshot — atomic SQLite backup with WAL checkpoint.

Creates a consistent copy of the database by issuing a WAL checkpoint then performing an atomic file copy. Tracks snapshots in backup_snapshots.

Functions

backup_dir

Default backup directory under the data root.

create_snapshot

Create an atomic snapshot of the SQLite database.

get_snapshot

Find a snapshot by ID.

list_snapshots

List all recorded snapshots, newest first.

verify_snapshot

Verify a snapshot file matches its recorded checksum.