Use a data product frame to negotiate explicit source guarantees without blaming the upstream team.
Marcus M Payments engineering lead 1 Open 2 Guarantee 3 Close The moment 20 sec Source change tension Payments added a new payment_status value without notice. Revenue recognition stayed green but classified partial refunds as failures. The goal is not to win ownership. The goal is to make the producer-consumer interface explicit enough to change safely. $80K daily classification risk 0 days of change notice
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