Merge = one alias row (reversible). PSA GetByCertNumber is ground truth. Monthly cleanup (1st of the month): mining refills the queue at 08:00 UTC, auto-process merges PSA-confirmed pairs at 09:00 UTC. 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.