Idempotent Reads: Offset Management

Most candidates think about idempotent writes but forget about idempotent reads. If your input query changes between runs, your output will change too, even if your write pattern is idempotent. This is the follow-up trap interviewers use to separate hire from strong hire. The Follow-Up Trap Idempotent Read Patterns The strongest signal: 'I would never use NOW() in a pipeline query. Every temporal boundary is a parameter passed by the orchestrator. This makes the pipeline deterministic, testable, and backfillable.' This one sentence addresses idempotent reads, testability, and operational maturity.