Add project files.

Server/Repository/EventRegistrationContext.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.AspNetCore.Http;
+using Oqtane.Modules;
+using Oqtane.Repository;
+using Oqtane.Infrastructure;
+using Oqtane.Repository.Databases.Interfaces;
+
+namespace SZUAbsolventenverein.Module.EventRegistration.Repository
+{
+    public class EventRegistrationContext : DBContextBase, ITransientService, IMultiDatabase
+    {
+        public virtual DbSet<Models.Event> Event { get; set; }
+        public virtual DbSet<Models.Response> Response { get; set; }
+
+        public EventRegistrationContext(IDBContextDependencies DBContextDependencies) : base(DBContextDependencies)
+        {
+            // ContextBase handles multi-tenant database connections
+        }
+
+        protected override void OnModelCreating(ModelBuilder builder)
+        {
+            base.OnModelCreating(builder);
+
+            builder.Entity<Models.Event>().ToTable(ActiveDatabase.RewriteName("SZUAbsolventenvereinEvent"));
+            builder.Entity<Models.Response>().ToTable(ActiveDatabase.RewriteName("SZUAbsolventenvereinEventResponse"));
+        }
+    }
+}

Server/Repository/EventRegistrationRepository.cs

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+using Microsoft.EntityFrameworkCore;
+using System.Linq;
+using System.Collections.Generic;
+using Oqtane.Modules;
+
+namespace SZUAbsolventenverein.Module.EventRegistration.Repository
+{
+    public class EventRegistrationRepository : IEventRegistrationRepository, ITransientService
+    {
+        private readonly IDbContextFactory<EventRegistrationContext> _factory;
+
+        public EventRegistrationRepository(IDbContextFactory<EventRegistrationContext> factory)
+        {
+            _factory = factory;
+        }
+
+        public IEnumerable<Models.Event> GetEventRegistrations(int ModuleId)
+        {
+            using var db = _factory.CreateDbContext();
+            return db.Event.Where(item => item.ModuleId == ModuleId).ToList();
+        }
+
+        public Models.Event GetEventRegistration(int EventRegistrationId)
+        {
+            return GetEventRegistration(EventRegistrationId, true);
+        }
+
+        public Models.Event GetEventRegistration(int EventRegistrationId, bool tracking)
+        {
+            using var db = _factory.CreateDbContext();
+            if (tracking)
+            {
+                return db.Event.Find(EventRegistrationId);
+            }
+            else
+            {
+                return db.Event.AsNoTracking().FirstOrDefault(item => item.EventRegistrationId == EventRegistrationId);
+            }
+        }
+
+        public Models.Event AddEventRegistration(Models.Event EventRegistration)
+        {
+            using var db = _factory.CreateDbContext();
+            db.Event.Add(EventRegistration);
+            db.SaveChanges();
+            return EventRegistration;
+        }
+
+        public Models.Event UpdateEventRegistration(Models.Event EventRegistration)
+        {
+            using var db = _factory.CreateDbContext();
+            db.Entry(EventRegistration).State = EntityState.Modified;
+            db.SaveChanges();
+            return EventRegistration;
+        }
+
+        public void DeleteEventRegistration(int EventRegistrationId)
+        {
+            using var db = _factory.CreateDbContext();
+            Models.Event EventRegistration = db.Event.Find(EventRegistrationId);
+            db.Event.Remove(EventRegistration);
+            db.SaveChanges();
+        }
+    }
+}

Server/Repository/IEventRegistrationRepository.cs

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+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace SZUAbsolventenverein.Module.EventRegistration.Repository
+{
+    public interface IEventRegistrationRepository
+    {
+        IEnumerable<Models.Event> GetEventRegistrations(int ModuleId);
+        Models.Event GetEventRegistration(int EventRegistrationId);
+        Models.Event GetEventRegistration(int EventRegistrationId, bool tracking);
+        Models.Event AddEventRegistration(Models.Event EventRegistration);
+        Models.Event UpdateEventRegistration(Models.Event EventRegistration);
+        void DeleteEventRegistration(int EventRegistrationId);
+    }
+}