Initial

LehrerApp.Data/Repositories/StudentRepository.cs

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+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+
+namespace LehrerApp.Data.Repositories;
+
+public class StudentRepository(LiteDbContext db) : IStudentRepository
+{
+    public Student? GetById(Guid id) =>
+        db.Students.FindById(id);
+
+    public List<Student> GetAll(bool includeInactive = false) =>
+        includeInactive
+            ? db.Students.FindAll().OrderBy(s => s.LastName).ToList()
+            : db.Students.Find(s => s.IsActive).OrderBy(s => s.LastName).ToList();
+
+    public List<Student> GetByGroup(Guid groupId, string schoolYear)
+    {
+        // Enrollment als Bindeglied – Schüler-IDs der Gruppe ermitteln
+        var studentIds = db.Enrollments
+            .Find(e => e.GroupId == groupId && e.SchoolYear == schoolYear)
+            .Select(e => e.StudentId)
+            .ToHashSet();
+
+        return db.Students
+            .Find(s => studentIds.Contains(s.Id))
+            .OrderBy(s => s.LastName)
+            .ToList();
+    }
+
+    public void Save(Student student)
+    {
+        student.UpdatedAt = DateTime.UtcNow;
+        db.Students.Upsert(student);
+    }
+
+    public void Delete(Guid id) =>
+        db.Students.Delete(id);
+}