Refactored AgeGroup namespace and services, added RegistrationKey functionality.

API/Repository/AgeGroupRepo/AgeGroupService.cs

@@ -0,0 +1,68 @@
+using API.Database;
+using API.Models.Internal.Altersgruppen;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Repository.AgeGroupRepo
+{
+    public class AgeGroupService : IAgeGroupService
+    {
+        private ApplicationDbContext _context;
+
+        public AgeGroupService(ApplicationDbContext context)
+        {
+            _context = context;
+        }
+
+        public async Task<AltersGruppe> CreateAsync(AltersGruppe altersGruppe)
+        {
+            await _context.Altersgruppen.AddAsync(altersGruppe);
+            await _context.SaveChangesAsync();
+            return altersGruppe;
+        }
+
+        public async Task<AltersGruppe?> DeleteAsync(string id)
+        {
+            var group = await _context.Altersgruppen.FirstOrDefaultAsync(x => x.Id == id);
+
+            if (group == null)
+            {
+                return null;
+            }
+
+            _context.Altersgruppen.Remove(group);
+            _context.SaveChanges();
+
+            return group;
+        }
+
+        public async Task<List<AltersGruppe>> GetAllAsync()
+        {
+            var allGroups = await _context.Altersgruppen.ToListAsync();
+
+            return allGroups;
+        }
+
+        public async Task<AltersGruppe?> GetAsync(string id)
+        {
+            return await _context.Altersgruppen.FindAsync(id);
+        }
+
+        public async Task<AltersGruppe?> UpdateAsync(string id, AltersGruppe altersGruppe)
+        {
+            var existingGroup = await _context.Altersgruppen.FirstOrDefaultAsync(x => x.Id == id);
+
+            if (existingGroup == null)
+            {
+                return null;
+            }
+
+            existingGroup.Name = altersGruppe.Name;
+            existingGroup.StartingAge = altersGruppe.StartingAge;
+            existingGroup.EndingAge = altersGruppe.EndingAge;
+
+            await _context.SaveChangesAsync();
+
+            return existingGroup;
+        }
+    }
+}