Initial

LehrerApp.Core/Models/Exam.cs

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+namespace LehrerApp.Core.Models;
+
+public class Exam
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid GroupId { get; set; }
+    public string Title { get; set; } = "";             // "Arbeit Nr. 2 – Redox"
+    public DateOnly Date { get; set; }
+    public string Subject { get; set; } = "";
+    public int? ExamNumber { get; set; }
+    public List<ExamTask> Tasks { get; set; } = [];     // nested – kein JOIN
+    public List<GradingKeyEntry> GradingKey { get; set; } = [];
+    public ExamStatus Status { get; set; } = ExamStatus.Planned;
+    public string? Notes { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public class ExamTask
+{
+    public int Nr { get; set; }
+    public string? Title { get; set; }
+    public double MaxPoints { get; set; }
+    public double Weight { get; set; } = 1.0;
+}
+
+public class GradingKeyEntry
+{
+    public string Grade { get; set; } = "";             // "1","2"... oder "15","14"...
+    public double MinPercent { get; set; }
+}
+
+// Ergebnisse separat – für Notenspiegel ohne Aufgabentext laden
+public class ExamResult
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid ExamId { get; set; }
+    public Guid StudentId { get; set; }
+    public List<double> Points { get; set; } = [];      // Index = Aufgabe Nr - 1
+    public double TotalPoints { get; set; }
+    public string? Grade { get; set; }
+    public bool Absent { get; set; }
+    public string? Comment { get; set; }
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public enum ExamStatus { Planned, Conducted, Graded, Returned }