Shopper
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Candidates retrieved
Also time the same rows as single queries (a 15-row sample, extrapolated)
Rank candidates
One bulk query
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rows in one call
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Chalk execution
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round trip
The call
Bulk vs one query per candidate
Candidate mix by category
Shopper features (computed once, shared by every row)
Top 10 by model score
Pick a shopper to rank their candidates.