fix: add missing err checks and fix loop termination in tests

backend/handlers/today/today_test.go

@@ -134,6 +134,9 @@ func TestGetTodayAppointments_OmitsPreviousNameWhenNoHistory(t *testing.T) {
 		VALUES ($1, NOW() + INTERVAL '5 minutes', 'in_progress')
 		RETURNING id
 	`, userID).Scan(&bookingID)
+	if err != nil {
+		t.Fatalf("failed to insert test booking: %v", err)
+	}
 	addBookingService(t, ctx, tx, bookingID, svcID)
 
 	req := httptest.NewRequest(http.MethodGet, "/api/admin/today/appointments", nil)
@@ -344,6 +347,9 @@ func TestGetPendingApprovals_OmitsPreviousNameWhenNoHistory(t *testing.T) {
 		VALUES ($1, NOW() + INTERVAL '1 day', 'pending')
 		RETURNING id
 	`, userID).Scan(&bookingID)
+	if err != nil {
+		t.Fatalf("failed to insert test booking: %v", err)
+	}
 	addBookingService(t, ctx, tx, bookingID, svcID)
 
 	req := httptest.NewRequest(http.MethodGet, "/api/admin/today/pending-approvals", nil)