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Mission: API rows to a model-ready DataFrame — step 7 of 7

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Checkpoint

One last thing before we move on. pass this to mark the lesson done, or skip and keep moving.

Checkpoint — the mission in miniature. Write pipeline(raw) that flattens/casts each record (user from profile, float amount), drops-and-counts failures, and returns (clean_rows, report) where report is {"kept": n, "dropped": n}. Print the report and the per-user total for maya.

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