diff --git a/src/core/Deal.Modules.Tenants/Application/Extensions/AuditRecordDtoExtensions.cs b/src/core/Deal.Modules.Tenants/Application/Extensions/AuditRecordDtoExtensions.cs
index b0879fd..c806285 100644
--- a/src/core/Deal.Modules.Tenants/Application/Extensions/AuditRecordDtoExtensions.cs
+++ b/src/core/Deal.Modules.Tenants/Application/Extensions/AuditRecordDtoExtensions.cs
@@ -183,11 +183,12 @@ public static class AuditRecordDtoExtensions
 
     // Приводит значение JSON к строке отображения.
     // element: Значение JSON.
-    // Возвращает: Строковое представление либо null для JSON null.
+    // Возвращает: Строковое представление либо null для JSON null; массивы — списком через запятую.
     private static string? Stringify(JsonElement element) => element.ValueKind switch
     {
         JsonValueKind.Null or JsonValueKind.Undefined => null,
         JsonValueKind.String => element.GetString(),
+        JsonValueKind.Array => string.Join(", ", element.EnumerateArray().Select(Stringify)),
         _ => element.GetRawText(),
     };
 
diff --git a/src/core/tests/Deal.Tests.Unit/Modules/Tenants/AuditRecordDtoExtensionsTests.cs b/src/core/tests/Deal.Tests.Unit/Modules/Tenants/AuditRecordDtoExtensionsTests.cs
index f9bd186..659e5c5 100644
--- a/src/core/tests/Deal.Tests.Unit/Modules/Tenants/AuditRecordDtoExtensionsTests.cs
+++ b/src/core/tests/Deal.Tests.Unit/Modules/Tenants/AuditRecordDtoExtensionsTests.cs
@@ -81,6 +81,28 @@ public sealed class AuditRecordDtoExtensionsTests
             });
     }
 
+    [Fact]
+    public void AuditChanges_LegacyFieldsArray_RendersAsList()
+    {
+        var record = Record("""{"fields":["autoMonitorNew"]}""");
+
+        AuditChangeDto change = Assert.Single(record.AuditChanges());
+
+        Assert.Equal(AuditFields.Fields, change.Field);
+        Assert.Null(change.From);
+        Assert.Equal("autoMonitorNew", change.To);
+    }
+
+    [Fact]
+    public void AuditChanges_LegacyFieldsArray_JoinsMultipleKeys()
+    {
+        var record = Record("""{"fields":["autoMonitorNew","minLen"]}""");
+
+        AuditChangeDto change = Assert.Single(record.AuditChanges());
+
+        Assert.Equal("autoMonitorNew, minLen", change.To);
+    }
+
     [Fact]
     public void AuditChanges_InvalidJson_ReturnsEmpty()
     {