Brief
Defend one timed screen set (SQL queries + EDA artifact) in a recorded 15-minute walkthrough with 5 minutes of self-graded follow-up answers.
Dataset
Messy orders CSV + transactions file (same as m0-l2 cases) with a holdout question revealed at record time (no prep beyond the timed set).
Starter guardrails (plan 88)
Screen-set template (queries + counts + 3 charts max); recording checklist; follow-up bank (5 questions) answered in writing alongside the video.
100-pt rubric
Query correctness 30; EDA insight quality 25; narration/structure 20; follow-up answers 15; recording discipline (timeboxes hit) 10.
Deterministic checks -> LLM review
Checks: recording present + <= 20 min; queries run (outputs attached); follow-ups answered. LLM review grades reasoning and grilling readiness.