Design the API for a bulk import that accepts files with up to a million rows. Customers shouldn't wait an hour to learn that row 3 was malformed. What's the contract?

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Design the API for a bulk import that accepts files with up to a million rows. Customers shouldn't wait an hour to learn that row 3 was malformed. What's the contract?

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