Initial commit: Domain model, Infrastructure, and Database setup

src/Hospitality.Domain/Entities/Event.cs

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+namespace Hospitality.Domain.Entities;
+
+public class Event
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public DateTime StartDate { get; set; }
+    public DateTime EndDate { get; set; }
+    public string Location { get; set; } = string.Empty;
+    public List<Group> Groups { get; set; } = new();
+    public List<Product> Products { get; set; } = new();
+}

src/Hospitality.Domain/Entities/Group.cs

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+namespace Hospitality.Domain.Entities;
+
+public class Group
+{
+    public Guid Id { get; set; }
+    public Guid EventId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? ContactPersonName { get; set; }
+    public string? ContactEmail { get; set; }
+    
+    public Event Event { get; set; } = null!;
+    public List<Person> People { get; set; } = new();
+    public List<QuotaDefinition> DefaultQuotas { get; set; } = new();
+}

src/Hospitality.Domain/Entities/Person.cs

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+namespace Hospitality.Domain.Entities;
+
+public class Person
+{
+    public Guid Id { get; set; }
+    public Guid GroupId { get; set; }
+    public Guid QrCode { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? Email { get; set; }
+    public string? PhoneNumber { get; set; }
+    
+    public Group Group { get; set; } = null!;
+    public List<PersonQuota> Quotas { get; set; } = new();
+}

src/Hospitality.Domain/Entities/PersonQuota.cs

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+namespace Hospitality.Domain.Entities;
+
+public class PersonQuota
+{
+    public Guid Id { get; set; }
+    public Guid PersonId { get; set; }
+    public Guid ProductId { get; set; }
+    public int InitialAmount { get; set; }
+    public int UsedAmount { get; set; }
+    
+    public int RemainingAmount => InitialAmount - UsedAmount;
+    
+    public Person Person { get; set; } = null!;
+    public Product Product { get; set; } = null!;
+}

src/Hospitality.Domain/Entities/Product.cs

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+using Hospitality.Domain.Enums;
+
+namespace Hospitality.Domain.Entities;
+
+public class Product
+{
+    public Guid Id { get; set; }
+    public Guid EventId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public ProductType Type { get; set; }
+    public Event Event { get; set; } = null!;
+}

src/Hospitality.Domain/Entities/QuotaDefinition.cs

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+namespace Hospitality.Domain.Entities;
+
+public class QuotaDefinition
+{
+    public Guid Id { get; set; }
+    public Guid GroupId { get; set; }
+    public Guid ProductId { get; set; }
+    public int InitialAmount { get; set; }
+    
+    public Group Group { get; set; } = null!;
+    public Product Product { get; set; } = null!;
+}

src/Hospitality.Domain/Entities/Transaction.cs

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+namespace Hospitality.Domain.Entities;
+
+public class Transaction
+{
+    public Guid Id { get; set; }
+    public Guid PersonId { get; set; }
+    public Guid ProductId { get; set; }
+    public int Amount { get; set; }
+    public DateTime Timestamp { get; set; }
+    public Guid? StaffId { get; set; }
+    
+    public Person Person { get; set; } = null!;
+    public Product Product { get; set; } = null!;
+}

src/Hospitality.Domain/Enums/ProductType.cs

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+namespace Hospitality.Domain.Enums;
+
+public enum ProductType
+{
+    Access,
+    Drink,
+    Meal,
+    Special
+}

src/Hospitality.Domain/Hospitality.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>