Generated the JSON contracts of the stored data at compile time (#1148)

app/MindWork AI Studio/Tools/DataBackup/DataBackupFormat.cs

@@ -51,12 +51,13 @@ public static class DataBackupFormat
     /// How the manifest and the plan of a restore are written: readable for anybody who opens them,
     /// and for the runtime, which applies the plan.
     /// </summary>
-    public static readonly JsonSerializerOptions JSON_OPTIONS = new()
+    public static readonly JsonSerializerOptions JSON_OPTIONS = new JsonSerializerOptions
     {
         WriteIndented = true,
         PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
         Converters = { new JsonStringEnumConverter() },
-    };
+        TypeInfoResolver = DataBackupJsonContext.Default,
+    }.AsReadOnly();
 
     /// <summary>
     /// File types which are compressed already. Compressing them once more costs time and makes the

app/MindWork AI Studio/Tools/DataBackup/DataBackupJsonContext.cs

@@ -0,0 +1,13 @@
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Tools.DataBackup;
+
+/// <summary>
+/// The contracts with which System.Text.Json reads and writes the manifest of a backup and the plan and report of
+/// a restore, built at compile time.
+/// </summary>
+[JsonSourceGenerationOptions(GenerationMode = JsonSourceGenerationMode.Metadata)]
+[JsonSerializable(typeof(DataBackupManifest))]
+[JsonSerializable(typeof(DataRestorePlan))]
+[JsonSerializable(typeof(DataRestoreReport))]
+internal sealed partial class DataBackupJsonContext : JsonSerializerContext;