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Why does the report show more orders than the store actually took?
What you'll have at the end
A load that halts and logs its reason before a bad batch reaches the report
You need
A scheduled load that already moves rows from a source into a table a report reads, with query access to both the source system and wherever those rows land.
Not covered
Fixing why the batch produced duplicate rows in the first place, such as a retry that reruns an already-loaded window; this recipe only keeps a bad batch from reaching the report.
Make a pipeline safe to rerun with an upsert
use this once the gate keeps catching the same duplicate-batch pattern, so the pipeline stops producing the duplicates instead of only catching them.
Reconcile every row between source and target after a load
reach for this once a batch has already passed the gate and someone wants a full field-by-field audit of everything that landed.
Checked 25 Aug 2026
Part of the ETL (Extract, Transform, Load) cookbook