heliosdb-nano-backup

Backup and restore HeliosDB-Nano. Two surfaces — CLI (heliosdb-nano dump / restore) and library (db.dump_full / db.restore_from_dump / db.restore_tables). Compression options (zstd default, gzip, brotli, none). Append (incremental) backups. Periodic background dumps via --dump-schedule "0 */6 * * *". Verification on restore. Use this for routine backups, partial table restores, in-memory persistence, and migrating a…