fix(transport): preserve MinTimeBetweenRuns + ExternalSystem retry fields in bundle DTOs

Add TimeSpan? MinTimeBetweenRuns to TemplateScriptDto and int MaxRetries /
TimeSpan RetryDelay to ExternalSystemDto; wire both directions in
EntitySerializer. Extends the existing script round-trip assertion and adds
Roundtrip_external_system_preserves_retry_config.

src/ScadaLink.Transport/Serialization/EntityDtos.cs

@@ -87,7 +87,8 @@ public sealed record TemplateScriptDto(
     string? TriggerConfiguration,
     string? ParameterDefinitions,
     string? ReturnDefinition,
-    bool IsLocked);
+    bool IsLocked,
+    TimeSpan? MinTimeBetweenRuns);
 
 public sealed record TemplateCompositionDto(
     string InstanceName,
@@ -103,6 +104,8 @@ public sealed record ExternalSystemDto(
     string Name,
     string BaseUrl,
     string AuthType,
+    int MaxRetries,
+    TimeSpan RetryDelay,
     IReadOnlyList<ExternalSystemMethodDto> Methods,
     SecretsBlock? Secrets);
 

src/ScadaLink.Transport/Serialization/EntitySerializer.cs

@@ -55,7 +55,8 @@ public sealed class EntitySerializer
                     TriggerConfiguration: s.TriggerConfiguration,
                     ParameterDefinitions: s.ParameterDefinitions,
                     ReturnDefinition: s.ReturnDefinition,
-                    IsLocked: s.IsLocked)).ToList(),
+                    IsLocked: s.IsLocked,
+                    MinTimeBetweenRuns: s.MinTimeBetweenRuns)).ToList(),
                 Compositions: t.Compositions.Select(c => new TemplateCompositionDto(
                     InstanceName: c.InstanceName,
                     ComposedTemplateName: templateNameById.TryGetValue(c.ComposedTemplateId, out var cn) ? cn : string.Empty)).ToList())).ToList(),
@@ -89,6 +90,8 @@ public sealed class EntitySerializer
                     Name: sys.Name,
                     BaseUrl: sys.EndpointUrl,
                     AuthType: sys.AuthType,
+                    MaxRetries: sys.MaxRetries,
+                    RetryDelay: sys.RetryDelay,
                     Methods: methods,
                     Secrets: secrets);
             }).ToList(),
@@ -204,6 +207,7 @@ public sealed class EntitySerializer
                         ParameterDefinitions = s.ParameterDefinitions,
                         ReturnDefinition = s.ReturnDefinition,
                         IsLocked = s.IsLocked,
+                        MinTimeBetweenRuns = s.MinTimeBetweenRuns,
                     });
                 }
                 return t;
@@ -253,6 +257,8 @@ public sealed class EntitySerializer
             {
                 Id = ix + 1,
                 AuthConfiguration = dto.Secrets?.Values.TryGetValue("AuthConfiguration", out var auth) == true ? auth : null,
+                MaxRetries = dto.MaxRetries,
+                RetryDelay = dto.RetryDelay,
             };
             externalSystems.Add(sys);
             foreach (var m in dto.Methods)

tests/ScadaLink.Transport.Tests/Serialization/EntitySerializerTests.cs

@@ -96,6 +96,7 @@ public sealed class EntitySerializerTests
             ParameterDefinitions = "[]",
             ReturnDefinition = "void",
             IsLocked = false,
+            MinTimeBetweenRuns = TimeSpan.FromSeconds(30),
         });
 
         var assembly = new Template("Assembly") { Id = 2, FolderId = 1 };
@@ -133,6 +134,7 @@ public sealed class EntitySerializerTests
         Assert.Equal("OnUpdate", rtScript.Name);
         Assert.Equal("return 1;", rtScript.Code);
         Assert.Equal("Periodic", rtScript.TriggerType);
+        Assert.Equal(TimeSpan.FromSeconds(30), rtScript.MinTimeBetweenRuns);
 
         var rtAssembly = Assert.Single(roundTripped.Templates, t => t.Name == "Assembly");
         var rtComp = Assert.Single(rtAssembly.Compositions);
@@ -164,6 +166,27 @@ public sealed class EntitySerializerTests
         Assert.Equal(rtRoot.Id, rtChild.ParentFolderId);
     }
 
+    [Fact]
+    public void Roundtrip_external_system_preserves_retry_config()
+    {
+        var sys = new ExternalSystemDefinition("billing", "https://billing/api", "Basic")
+        {
+            Id = 1,
+            MaxRetries = 5,
+            RetryDelay = TimeSpan.FromSeconds(15),
+        };
+        var aggregate = MakeEmptyAggregate() with { ExternalSystems = new[] { sys } };
+
+        var sut = new EntitySerializer();
+        var dto = sut.ToBundleContent(aggregate);
+        var roundTripped = sut.FromBundleContent(dto);
+
+        var rtSys = Assert.Single(roundTripped.ExternalSystems);
+        Assert.Equal("billing", rtSys.Name);
+        Assert.Equal(5, rtSys.MaxRetries);
+        Assert.Equal(TimeSpan.FromSeconds(15), rtSys.RetryDelay);
+    }
+
     [Fact]
     public void FromDto_with_null_SecretsBlock_yields_entity_with_default_empty_secrets()
     {
@@ -173,7 +196,7 @@ public sealed class EntitySerializerTests
             SharedScripts: Array.Empty<SharedScriptDto>(),
             ExternalSystems: new[]
             {
-                new ExternalSystemDto("erp", "https://x", "None", Array.Empty<ExternalSystemMethodDto>(), Secrets: null),
+                new ExternalSystemDto("erp", "https://x", "None", MaxRetries: 3, RetryDelay: TimeSpan.FromSeconds(5), Array.Empty<ExternalSystemMethodDto>(), Secrets: null),
             },
             DatabaseConnections: Array.Empty<DatabaseConnectionDto>(),
             NotificationLists: Array.Empty<NotificationListDto>(),