Create Separate Databases for Each Microservice

Currently, all microservices share a single database (finance_db), which causes schema conflicts and migration issues. To improve isolation and scalability, each microservice should have its own dedicated database.

Tasks:

• Update docker-compose.yml to define separate Postgres instances for each microservice.
• Modify each microservice's database connection string to point to its respective database.
• Update environment variables and secrets to reflect the new database structure.
• Test connectivity and data isolation between services.

Acceptance Criteria:

• Each microservice has its own database instance.
• No schema conflicts or migration issues across services.
• Services can still communicate where needed via APIs.