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Replace the hdbsql SELECT-based schema DDL export with SAP HANA's official BACKUP DATA USING FILE for proper data-level backup. Changes: - Run: issue BACKUP DATA [FOR <tenant>] USING FILE via hdbsql, package resulting backup files into tar archive as artifact - Restore: extract tar, locate backup prefix, issue RECOVER DATA [FOR <tenant>] USING FILE ... CLEAR LOG - Add helper functions: buildHdbsqlArgs, packageBackupFiles, extractTarArchive, findBackupPrefix - Add 7 unit tests covering backup/restore/error paths