◈ Layer 1: 30-Second Summary
"We chose PostgreSQL for its robust JSON support, excellent performance with complex queries,
and superior ACID compliance. It's handled 50M+ transactions without breaking a sweat."
— Former Tech Lead, 6 months ago
◈ Layer 2: Architecture Documentation
Database Selection Framework v2.0
Requirements evaluated: ACID compliance, JSON capabilities, horizontal scaling,
community support, operational complexity. PostgreSQL scored 9.2/10 across all criteria.
— Architecture Decision Record #47
◈ Layer 3: The Great Debate (Slack, 2022)
@sarah: "But MongoDB would give us more flexibility with schema changes"
@mike: "At the cost of data integrity. We're dealing with financial transactions here"
@cto: "PostgreSQL's JSONB gives us flexibility AND integrity. Decision made."
— #eng-debate channel, March 15, 2022
◈ Layer 4: Decision Framework
Technical Decision Rubric:
1. Data integrity critical? → Yes
2. Query complexity? → High (joins, aggregations)
3. Schema evolution needed? → Moderate
4. Team expertise? → PostgreSQL: 8/10
5. Operational overhead? → Medium
Result: PostgreSQL recommended
— Tech Governance Board Framework