Backend Tests / test (push) Failing after 49s
The dev-tagged Connect() in db_dev.go hardcoded localhost:5432 in the DSN instead of reading the POSTGRES_HOST env var. Since CI tests run with -tags "test,dev", db_dev.go is compiled and the POSTGRES_HOST=postgres env var was silently ignored, causing db package tests to try connecting to 127.0.0.1:5432 where no PostgreSQL is listening (service container is only reachable via Docker DNS hostname postgres). Also remove the -a flag from the workflow now that caching is no longer suspected of causing issues.