PostgreSQL/MySQL Database Migration

[dmccoystephenson]

Replace H2 in-memory database with PostgreSQL or MySQL for production persistence.

Acceptance Criteria:

• Add PostgreSQL/MySQL driver dependency
• Create production database schema
• Update application.properties with production database config
• Add Flyway or Liquibase for database migrations
• Create migration scripts for initial schema
• Configure connection pooling (HikariCP)
• Test database connectivity and performance
• Document database setup instructions
• Add database backup strategy

Estimated Effort: 2-3 days

Dependencies: None