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Bernt 2f0ab18e81 PR-003A: PostgreSQL Repository Adapters + Persistence Independence Test

- 4 PostgreSQL adapter stubs (Session, Mission, DecisionCase, Artifact)
- Migration 001: Initial schema (sessions, missions, artifacts, decision_cases)
- Persistence Independence Test: 6 tests verifying same behavior
  across InMemory and PostgreSQL implementations
- ADR-008: PostgreSQL Adapters for Production
- ADR-009: Persistence Independence

Architecture Quality Gates:
- Domain unchanged
- Application unchanged
- Only adapter implementation changes
- Same test suite runs against both implementations

Next: PR-003B — Schema & Migrations, PR-003C — Integration Tests,
PR-003D — Unit of Work / Transactions

2026-07-02 15:57:23 +00:00

959 B

Raw Blame History

ADR-009: Persistence Independence

Status

Accepted

Context

We need to ensure that business logic is not coupled to persistence implementation.

Decision

Same use cases must produce same results regardless of repository implementation.

Verification Method

Run test with InMemoryRepository
Run test with PostgresRepository (when implemented)
Compare results
If different, adapter is wrong

Architecture Rules

Domain: 0 external dependencies
Application: only domain + contracts
Infrastructure: may depend on external libraries, never reverse
Persistence Independence: same use cases, same results

Consequences

Positive

Strong architecture verification
Easy to swap implementations
Tests document expected behavior

Negative

Need to maintain two test suites
PostgreSQL tests require database setup

ADR-006: In-Memory Adapters for Testing
ADR-008: PostgreSQL Adapters for Production

959 B Raw Blame History