[Bug]: Selecting archive summary table after setting ARCHIVELOG at once causes type converting error

Describe the bug

1. Apply a OBTenantBackupPolicy resource
2. Error occurs several seconds after applying the resource

Query list failed, sql SELECT dest_id, round_id, dest_no, status, start_scn, start_scn_display, checkpoint_scn, checkpoint_scn_display, compatible, base_piece_id, used_piece_id, piece_switch_interval, input_bytes, input_bytes_display, output_bytes, output_bytes_display, compression_ratio, deleted_input_bytes, deleted_input_bytes_display, deleted_output_bytes, deleted_output_bytes_display, comment, path FROM DBA_OB_ARCHIVELOG_SUMMARY ORDER BY round_id DESC LIMIT 1, param []: sql: Scan error on column index 7, name "checkpoint_scn_display": converting NULL to string is unsupported

Environment

ob-operator 2.3.0

Fast reproduce steps

1. Apply a OBTenantBackupPolicy resource
2. Error occurs several seconds after applying the resource

Expected behavior

No response

Actual behavior

No response

Additional context

No response

Trace the OBTenantBackupPolicy reconciliation path and the query for DBA_OB_ARCHIVELOG_SUMMARY, focusing on how checkpoint_scn_display is scanned. Check the existing tests around this reconciliation or query path, then verify that applying the resource succeeds when the database returns NULL for that column.