Switch backup to write converted entities instead of raw table rows via
entity_to_row, and map string state values like "Payed"/"Recived" to their
integer equivalents during CSV parsing. Add sandbox.toml config.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- scan.py: use entity_to_row from csv_utils instead of duplicated _fmt
- csv_utils: rename _parse_row to parse_row (public API)
- backup.py: use public parse_row
- cli.py: validate --start < --end in backup command
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
