Create a domain entity following FSH patterns with full multi-tenancy support.

Entity Template

public sealed class {Entity} : AggregateRoot<Guid>, IHasTenant, IAuditableEntity, ISoftDeletable
{
    // Domain properties
    public string Name { get; private set; } = null!;
    public decimal Price { get; private set; }
    public string? Description { get; private set; }

    // IHasTenant - automatic tenant isolation
    public string TenantId { get; private set; } = null!;

    // IAuditableEntity - automatic audit trails
    public DateTimeOffset CreatedAt { get; set; }
    public string? CreatedBy { get; set; }
    public DateTimeOffset? LastModifiedAt { get; set; }
    public string? LastModifiedBy { get; set; }

    // ISoftDeletable - automatic soft deletes
    public DateTimeOffset? DeletedAt { get; set; }
    public string? DeletedBy { get; set; }

    // Private constructor for EF Core
    private {Entity}() { }

    // Factory method - the only way to create
    public static {Entity} Create(string name, decimal price, string tenantId)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(name);
        ArgumentOutOfRangeException.ThrowIfNegativeOrZero(price);

        var entity = new {Entity}
        {
            Id = Guid.NewGuid(),
            Name = name,
            Price = price,
            TenantId = tenantId
        };

        entity.AddDomainEvent(new {Entity}CreatedEvent(entity.Id));
        return entity;
    }

    // Domain methods for state changes
    public void UpdateDetails(string name, decimal price, string? description)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(name);
        ArgumentOutOfRangeException.ThrowIfNegativeOrZero(price);

        Name = name;
        Price = price;
        Description = description;

        AddDomainEvent(new {Entity}UpdatedEvent(Id));
    }
}

Entity Template

public sealed class {Entity} : AggregateRoot<Guid>, IHasTenant, IAuditableEntity, ISoftDeletable { // Domain properties public string Name { get; private set; } = null!; public decimal Price { get; private set; } public string? Description { get; private set; } // IHasTenant - automatic tenant isolation public string TenantId { get; private set; } = null!; // IAuditableEntity - automatic audit trails public DateTimeOffset CreatedAt { get; set; } public string? CreatedBy { get; set; } public DateTimeOffset? LastModifiedAt { get; set; } public string? LastModifiedBy { get; set; } // ISoftDeletable - automatic soft deletes public DateTimeOffset? DeletedAt { get; set; } public string? DeletedBy { get; set; } // Private constructor for EF Core private {Entity}() { } // Factory method - the only way to create public static {Entity} Create(string name, decimal price, string tenantId) { ArgumentException.ThrowIfNullOrWhiteSpace(name); ArgumentOutOfRangeException.ThrowIfNegativeOrZero(price); var entity = new {Entity} { Id = Guid.NewGuid(), Name = name, Price = price, TenantId = tenantId }; entity.AddDomainEvent(new {Entity}CreatedEvent(entity.Id)); return entity; } // Domain methods for state changes public void UpdateDetails(string name, decimal price, string? description) { ArgumentException.ThrowIfNullOrWhiteSpace(name); ArgumentOutOfRangeException.ThrowIfNegativeOrZero(price); Name = name; Price = price; Description = description; AddDomainEvent(new {Entity}UpdatedEvent(Id)); } }

Interface	Purpose	Auto-Handled
`IHasTenant`	Tenant isolation	Query filtering
`IAuditableEntity`	Created/Modified tracking	SaveChanges interceptor
`ISoftDeletable`	Soft delete support	Delete interceptor
`AggregateRoot<T>`	Domain events support	Event dispatcher

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