Last project we've explicitly decided to not have any stored procedures ever since you basically can't test nor deploy them in any sane way. I'm all ears how you make it work.
For that project I was able to put SQL DDL+DML+stored procedures in version control, create/run stored procedure (TDD even) unit/integration tests on mock data against other stored procedures, had pass-fail testing/deployment in my CICD tool right alongside native app code, and did some rollback support (although that was more trouble than I think it was worth), all using Liquibase change sets (+git+Jenkins). Flyway could also have worked but we were using Liquibase.
It did require some creative thinking to apply changesets and preconditions and post conditions and ability to have stored procedures execute and read results of other stored procedures.
Last I checked, the system had been used over many years to process/evaluate $50 billion in order transactions.