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Path: docs/architecture/adr/0003-adopt-postgresql-for-primary-database.md
# ADR-0003: Adopt PostgreSQL for the Primary Database
## Status
Accepted
## Context
The application has outgrown SQLite for concurrent writes and operational visibility. We need stronger transactional guarantees, better backup tooling, and a database that can support production traffic growth.
## Decision
Adopt PostgreSQL as the primary relational database for all new production deployments.
## Consequences
PostgreSQL improves concurrency, operational tooling, and long-term scalability. It also introduces additional infrastructure and migration complexity compared with SQLite.Path: docs/architecture/adr/0004-introduce-event-driven-order-processing.md
# ADR-0004: Introduce Event-Driven Order Processing
## Status
Proposed
## Context
Synchronous order processing is increasing latency in the checkout flow and makes retries difficult when downstream services are degraded.
## Decision
Introduce an event-driven workflow for order fulfillment so checkout can publish an order event and downstream processors can handle fulfillment asynchronously.
## Consequences
This change should reduce user-facing latency and improve resilience. It also adds messaging infrastructure, operational monitoring needs, and eventual-consistency trade-offs.docs
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