Function capture_backup_sqlite 

pub fn capture_backup_sqlite(
    db: &Connection,
    spec: &BackupSpec,
    connection_name: &str,
    database: Option<&str>,
    policy: &Policy,
    audit: Option<&Arc<AuditDb>>,
) -> Result<Option<CapturedBackup>, BackupError>

Capture a pre-mutation backup from a SQLite handle, enforcing the row and byte caps with the policy’s overflow behaviour.