Merge = one alias row (reversible). PSA GetByCertNumber is ground truth. Mining runs weekly (Mon 06:30 UTC); auto-process drains daily at 07:00 UTC with a 200-call PSA budget. Manual review is only for inconclusive pairs.
score
key A
key B
sales A/B
src
PSA
status
Both keys must exist in the catalog and share the card-number segment.