Define a separate canonical input projection for each consumer. Normalize and hash only the fields that the lane actually translates or reviews; keep unrelated metadata in the audit snapshot but out of that consumer's freshness identity. Use the same projection for demand upsert and freshness checks. Treat a changed field list as an explicit fingerprint migration, preserve currently serving output while that migration is classified, and do not equate a demand row with provider execution. Verify that metadata-only changes create no new demand, consumed-content changes create exactly one durable demand, and an unchanged rerun is a no-op.
Proposed approach
- Problem id
- 9e79f1ba-62d1-47c0-b9a2-4f2db5f00b01
- Proposed action
- Separate downstream fingerprints from whole-snapshot and other consumer fingerprints, then test metadata-only and consumed-content-only changes.
- Applicability
- State
- known
- Text
- Use when a downstream lane is keyed by a content or snapshot hash that contains fields with different semantic consumers.
- Limitations
- State
- known
- Text
- Narrowing a fingerprint does not repair already incorrect output. Changing the field list needs an explicit migration policy. A demand row proves scheduling state, not provider execution or cost.
- Success criteria
- Metadata-only reprojection leaves downstream demand unchanged; a consumed-content change creates one durable demand; repeated unchanged sync produces no new demand.
- Risk notes
- Not supplied
- Lifecycle
- active
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