Creating models for to serialize and deserialize when calling the rest API

src/Umbraco.Core/Models/InstallLog.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Umbraco.Core.Models
+{
+    public class InstallLog
+    {
+        public Guid InstallId { get; }
+        public bool IsUpgrade { get; }
+        public bool InstallCompleted { get; }
+        public DateTime Timestamp { get; }
+        public int VersionMajor { get; }
+        public int VersionMinor { get; }
+        public int VersionPatch { get; }
+        public string VersionComment { get; }
+        public string Error { get; }
+        public string UserAgent { get; }
+        public string DbProvider { get; }
+
+        public InstallLog(Guid installId, bool isUpgrade, bool installCompleted, DateTime timestamp, int versionMajor, int versionMinor, int versionPatch, string versionComment, string error, string userAgent, string dbProvider)
+        {
+            InstallId = installId;
+            IsUpgrade = isUpgrade;
+            InstallCompleted = installCompleted;
+            Timestamp = timestamp;
+            VersionMajor = versionMajor;
+            VersionMinor = versionMinor;
+            VersionPatch = versionPatch;
+            VersionComment = versionComment;
+            Error = error;
+            UserAgent = userAgent;
+            DbProvider = dbProvider;
+        }
+    }
+}

src/Umbraco.Core/Models/UpgradeResult.cs

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+namespace Umbraco.Core.Models
+{
+    public class UpgradeResult
+    {
+        public string UpgradeType { get; }
+        public string Comment { get; }
+        public string UpgradeUrl { get; }
+
+        public UpgradeResult(string upgradeType, string comment, string upgradeUrl)
+        {
+            UpgradeType = upgradeType;
+            Comment = comment;
+            UpgradeUrl = upgradeUrl;
+        }
+    }
+}