Your question is Solve a Challenging Data Issue. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe a time you solved a challenging data issue.
Explain the symptoms, how you isolated the root cause, and the changes you made to the ETL or ELT pipeline. Cover data quality validation, recovery or backfill steps, stakeholder communication, and how you monitored the system afterward. Be specific about the trade-offs, tools, and evidence you used to confirm the issue was resolved.