I am starting building a new project related to fintech but I am confused what database would be best for fintech project and why ? Can anyone give me suggestion with reason. In techstack I am using Java with springboot.

I’m facing an issue with my Spring Boot project that involves three different databases. I’ve set up datasources and JPA configurations to map the repositories to their respective databases. I’m attaching an example of my class code. My goal is to implement a circuit breaker with Resilience4j to handle database failures. Specifically, I need the application to continue functioning if any of the databases fail. Additionally, one of the databases is currently inactive and undergoing maintenance. However, its unavailability prevents me from starting the project due to connection errors. Is it possible to configure the circuit breaker to manage connection errors at the application startup and allow the project to start?