Replace direct defers that ignored returned errors with explicit defer func() { _ = ... }() and use blank-assignment for Setenv/RemoveAll/Close to satisfy error-checking and ensure closures run. Convert several if-else chains to switch for clarity (status filter, test server path matching), switch strings.Replace to strings.ReplaceAll, and normalize some error/log message casing. These changes are minor refactors across handlers, services, database and tests to improve lint compliance and readability.
Add robust error checks and helpers, improve transaction safety, and refine default templates handling.
- Add api/handlers/test_helpers_test.go with mustUnmarshalResponse and mustScan helpers and update many handler tests to use them or to check json.Unmarshal errors to fail fast.
- Replace direct DB Scan calls in tests with mustScan or explicit error checks to surface query failures.
- Improve transaction rollback handling across codepaths (config handlers, database migrations, transaction utils, CertGenerator) to log rollback errors and avoid silent failures.
- Make WithTransaction/WithTimeoutTransaction/BatchTransaction formatting consistent and add panic-safe rollback logging.
- In main, log a warning instead of ignoring EnsureDefaultDataSources errors.
- Add/cleanup various helper blank assignments and small refactors in services (config_proxy, config_generator) and switch tests to shared response writers (writeJSONResponse/writeResponseBody) where applicable.
- Large cleanup and enhancements in config/defaults.go to preserve string formatting for YAML templates, ensure special fields are quoted/preserved, and tidy whitespace/formatting.
These changes improve test reliability, make DB/tx failures more visible, and ensure default template YAML preserves important string values.
