refactor: use actors for db configuration (#1604)

Co-authored-by: Claude <noreply@anthropic.com>

backend/internal/middleware/rate_limit_test.go

@@ -39,6 +39,7 @@ func startRateLimitServices(t *testing.T, policies ...RateLimitPolicy) map[strin
 	for name, rl := range limiters {
 		services[name] = rl.Service(svc)
 	}
+
 	return services
 }