# ADR 0004 — PostgreSQL stores Pulse domain state

**Status:** Accepted baseline

## Decision

Use PostgreSQL for configuration, inventory, relationships, dashboards, events, alert state/history, incidents, audit and job coordination.

## Rationale

The data is relational, transactional and queryable. PostgreSQL supports JSONB for bounded extensibility and reliable migrations/backups.

## Consequences

- All schema changes use migrations.
- Production database is private.
- Backup/restore is a release gate.
- Metric samples remain outside PostgreSQL.