fix: correct affiliate audit record sources

backend/internal/repository/affiliate_repo_test.go

@@ -1,6 +1,7 @@
 package repository
 
 import (
+	"os"
 	"strings"
 	"testing"
 
@@ -13,3 +14,15 @@ func TestAffiliateUserOverviewSQLIncludesMaturedFrozenQuota(t *testing.T) {
 	require.Contains(t, query, "ua.aff_quota + COALESCE(matured.matured_frozen_quota, 0)")
 	require.Contains(t, query, "frozen_until <= NOW()")
 }
+
+func TestAffiliateRecordQueriesUseLedgerAuditFields(t *testing.T) {
+	source, err := os.ReadFile("affiliate_repo.go")
+	require.NoError(t, err)
+	content := string(source)
+
+	require.Contains(t, content, "JOIN payment_orders po ON po.id = ual.source_order_id")
+	require.Contains(t, content, "ual.amount::double precision")
+	require.Contains(t, content, "ual.balance_after::double precision")
+	require.NotContains(t, content, "parseAffiliateRebateAmount")
+	require.NotContains(t, content, `"current_balance": "u.balance"`)
+}