# ADR-008: PostgreSQL Adapters for Production

## Status
Accepted

## Context
In-memory adapters are sufficient for testing but not for production. We need persistent storage.

## Decision
Implement PostgreSQL adapters that implement the same repository interfaces as in-memory adapters:

- PostgresFieldSessionRepository
- PostgresMissionRepository
- PostgresDecisionCaseRepository
- PostgresArtifactRegistry

Key principles:
- Same interface as in-memory adapters
- Domain unchanged
- Application unchanged
- Only adapter implementation changes

## Consequences

### Positive
- Production-ready persistence
- Same test suite verifies both implementations
- Easy to swap implementations

### Negative
- Requires PostgreSQL instance
- Need migrations
- More complex setup

## Related
- ADR-006: In-Memory Adapters for Testing
- ADR-009: Persistence Independence