- Add a PostgreSQL service in docker-compose.yml
- Create a Docker volume for persistent database storage
- Expose PostgreSQL on port 5432
- Update all microservices to use PostgreSQL
- Set DATABASE_URL as an environment variable in each service

- Set up Dockerfile for API Gateway
- Set up Dockerfile for User Service
- Set up Dockerfile for Transaction Service
- Set up Dockerfile for Budget Service
- Set up Dockerfile for Analytics Service
- Set up Dockerfile for Notification Service
- Ensured compatibility with docker-compose.yml for service orchestration