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# ADR-001: Use PostgreSQL instead of MongoDB
## Status
Accepted
## Context
We need a relational database to support complex joins and ACID transactions. We considered MongoDB for its flexible schema but it lacks transactional guarantees across documents.
## Decision
We'll use PostgreSQL.
## Consequences
- Gains: strong consistency, mature tooling, powerful query engine.
- Costs: more up-front schema design, learning curve for some devs.
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