- Replace primaryKey constraints with uniqueIndex where needed
- Fix schema for Auth, Contacts, Exchange Rates, Expense Participants, and Accounts tables
- Add missing import for uniqueIndex
- Switch from postgres.js to node-postgres (pg) for Drizzle
- Add proper type safety with TypeScript
- Add graceful shutdown of database connections
- Added documentation for architecture and code plan
- Implemented database schema for users, expenses, settlements, and transactions
- Set up double-entry bookkeeping system with multi-currency support
- Configured Hono web framework with middleware
- Integrated Drizzle ORM for database operations
