# ADR-0003: Persistence baseline and transition path

- **Status:** accepted
- **Date:** 2026-06-25

## Context

Architecture targets PostgreSQL baseline (optional MongoDB), while MVP currently runs on SQLite by default. V1 needs a clear transition path without destabilizing ongoing work.

## Decision

1. Preserve database URL configurability through centralized settings.
2. Keep SQLite functional for local dev/test and fast feedback.
3. Treat PostgreSQL as production baseline target for V1 completion.
4. Keep persistence access behind `transcription.db` runtime/session access points.

## Consequences

### Positive
- Clear migration path without immediate broad rewrite.
- Controlled risk while preserving velocity.

### Tradeoffs
- Temporary dual-path assumptions (SQLite local vs PostgreSQL target).

## Alternatives Considered

1. **Immediate forced PostgreSQL-only migration**
   - Rejected: higher short-term disruption risk.
2. **Remain SQLite-only for V1**
   - Rejected: inconsistent with architecture and requirement trajectory.