Fixed some small bugs after merge

internal/server/health_handler_test.go

@@ -5,18 +5,13 @@ import (
 	"net/http"
 	"testing"
 
-	"music-server/internal/db"
-
 	"github.com/stretchr/testify/assert"
 )
 
 // TestHealthCheck verifies the health endpoint returns database status
 func TestHealthCheck(t *testing.T) {
-	// Setup database
-	db.TestSetupDB(t)
-	defer db.TestTearDownDB(t)
-
 	e := StartTestServer(t)
+	// No explicit teardown - handled by StartTestServer's sync.Once
 
 	resp := MakeTestRequest(t, e, "GET", "/health")
 	assert.Equal(t, http.StatusOK, resp.Code)