Merge = one alias row (reversible). PSA GetByCertNumber is ground truth. Manual-merge mode: a small daily verify budget (00:10 PT) pre-confirms top-priority pairs; nothing merges without your click. Queue order: manual pairs, then high-confidence by split impact (min of sales A/B). Use the "✓ same_card" filter as your merge picklist.
split
score
key A
key B
sales A/B
src
PSA
status
Both keys must exist in the catalog and share the card-number segment.