Feed Invariants¶
Status¶
Normative Business Domain Specification
Purpose¶
This document defines the non-negotiable invariants of the Feed Domain.
Invariants are domain laws.
Policies may evolve. Specifications may evolve. Invariants must remain stable unless the Feed Domain model is explicitly redesigned.
Source Invariants¶
A source SHALL remain a stable origin inside the Platform.
A source SHALL NOT be confused with a publication, an import or an imported batch.
Publication Invariants¶
A publication SHALL remain distinct from the import that takes charge of it.
A publication SHALL represent what was published, not what downstream processing may infer from it.
Import Invariants¶
Every import SHALL be uniquely identifiable.
Every import SHALL be traceable to its source and publication context.
An import MUST NOT become a normalization, identity or projection concern.
Raw Batch Invariants¶
A raw batch SHALL remain faithful to its publication of origin.
A raw batch MUST NOT silently introduce interpretation, correction or enrichment.
A raw batch SHALL remain the business intake output transmitted before downstream transformation.
Metadata Invariants¶
Minimal import metadata SHALL always be present.
Minimal metadata SHALL include enough information to explain:
- where the import came from;
- which merchant it concerns;
- when the import happened;
- what outcome was observed.
Metadata MUST NOT contain interpreted product meaning.
Result Invariants¶
An import result SHALL remain explicit.
An import result MUST be explainable.
An import result MUST NOT modify the raw batch.
Boundary Invariants¶
The Feed Domain SHALL NOT contain:
- normalization rules;
- identity logic;
- projection logic;
- product interpretation;
- runtime orchestration;
- adapter behavior;
- infrastructure concerns.
No business interpretation SHALL be introduced before Stage.
Violation Model¶
When an invariant is violated, the Feed Domain MUST choose one explicit outcome:
- reject the intake;
- return an explicit import failure;
- return an explicit rejected outcome;
- return an explicit partially usable outcome.
A violation MUST NOT be ignored.
Architecture Decision¶
Decision: FOUNDATION
Feed Invariants become the strictest normative contract of the Feed Domain.
All future Feed Value Objects, Policies, Specifications, Events, Tests and Contracts must remain consistent with this document.