Build an Incremental Model Like a Ledger

events grow by six million rows per day and the team needs a repeatable ETL response. Use watermark, lookback, unique key, and run evidence as the operating model. The common trap is making the visible number move before the pipeline contract is safe to rerun. That creates a temporary win and a later incident. Name the promise Write the expected incremental state contract: watermark, lookback, unique key, and run evidence. A named promise turns the issue from vague concern into a testable claim. Check evidence Collect counts, timestamps, keys, rejects, and target operation for the affected run. Evidence identifies the…

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