11 The complete example model

using Relatude.DB.Common;
using Relatude.DB.Datamodels;
using Relatude.DB.Nodes;

namespace VenueApp.Models;

public enum EventStatus { Draft = 0, Published = 1, SoldOut = 2, Cancelled = 3 }
public enum VenueKind   { Indoor = 0, Outdoor = 1, Hybrid = 2 }

// ── Node types ───────────────────────────────────

public interface IOrganizer {
    Guid Id { get; set; }
    NodeMeta Meta { get; }

    [StringProperty(Indexed = true, MaxLength = 200, IndexedByWords = true, DisplayName = true)]
    string Name { get; set; }

    [StringProperty(UniqueValues = true, IgnoreDuplicateEmptyValues = true)]   // unique, but may be empty
    string ContactEmail { get; set; }

    [AddressProperty]    string Slug { get; }
    [CreatedUtcProperty] DateTime CreatedUtc { get; }

    OrganizerEvents.Events Events { get; }
}

public interface IVenue {
    Guid Id { get; set; }
    NodeMeta Meta { get; }

    [StringProperty(Indexed = true, IndexedByWords = true, PrefixSearch = true, DisplayName = true)]
    string Name { get; set; }

    [AddressProperty] string Slug { get; }

    [HtmlProperty(IndexedByWords = true, IndexedBySemantic = true)]
    string Description { get; set; }

    [GeoCoordinateProperty(Indexed = true)]
    GeoCoordinate Location { get; set; }

    [StringProperty(Indexed = true, MaxLength = 2)]
    string CountryCode { get; set; }

    [IntegerProperty(Indexed = true, MinValue = 0)]
    int Capacity { get; set; }

    [IntegerProperty(Indexed = true)]
    VenueKind Kind { get; set; }

    [BooleanProperty(Indexed = true)]
    bool IsAccessible { get; set; }

    [FileProperty]
    FileValue Photo { get; set; }

    [EmbeddedMapProperty(KeyProperty = nameof(OpeningHours.DayCode))]
    EmbeddedMap<string, OpeningHours> Hours { get; }

    VenueTree.Parent     Parent { get; }   // e.g. the complex a hall is in
    VenueTree.Children   Halls  { get; }
    EventsAtVenue.Events Events { get; }
}

public interface IEvent {
    Guid Id { get; set; }
    NodeMeta Meta { get; }

    [StringProperty(Indexed = true, IndexedByWords = true, IndexedBySemantic = true, PrefixSearch = true,
                    DisplayName = true)]
    string Title { get; set; }

    [HtmlProperty(IndexedByWords = true, IndexedBySemantic = true)]
    string Description { get; set; }

    [DateTimeProperty(Indexed = true)]
    DateTime StartsUtc { get; set; }

    [TimeSpanProperty(Indexed = true, MaxValue = "1.00:00:00")]
    TimeSpan Duration { get; set; }

    [DecimalProperty(Indexed = true, MinValue = "0", DefaultValue = "0",
                     FacetRangePowerBase = 2.0, FacetRangeCount = 6)]
    decimal Price { get; set; }

    [IntegerProperty(Indexed = true)]
    EventStatus Status { get; set; }

    [StringArrayProperty(Indexed = true)]
    string[] Tags { get; set; }

    [ReferenceProperty(Indexed = true)]
    Reference<IMediaAsset> Cover { get; }

    [ReferencesProperty(Indexed = true)]
    References<IOrganizer> Sponsors { get; }

    EventsAtVenue.Venue  Venue     { get; }
    OrganizerEvents.Host Host      { get; }
    Attendance.Attendees Attendees { get; }
}

public interface IAttendee {
    Guid Id { get; set; }
    NodeMeta Meta { get; }

    [StringProperty(Indexed = true, IndexedByWords = true, DisplayName = true)]
    string FullName { get; set; }

    [StringProperty(Indexed = true, UniqueValues = true)]
    string Email { get; set; }

    [GeoCoordinateProperty(Indexed = true)]
    GeoCoordinate HomeLocation { get; set; }

    Attendance.Events Attending { get; }
    Friends.Peers     Friends   { get; }
}

public interface IMediaAsset {
    Guid Id { get; set; }
    NodeMeta Meta { get; }

    [StringProperty(Indexed = true, DisplayName = true)]
    string FileName { get; set; }

    [FileProperty]
    FileValue File { get; set; }
}

// ── Embedded types ───────────────────────────────

public class OpeningHours {
    public Guid Id { get; set; }
    public string DayCode { get; set; } = string.Empty;   // "mon" … "sun"
    public TimeSpan Opens { get; set; }
    public TimeSpan Closes { get; set; }
}

// ── Relations ────────────────────────────────────

public class EventsAtVenue : OneToMany<IVenue, IEvent> {
    public class Venue  : One { }
    public class Events : Many { }
}

public class OrganizerEvents : OneToMany<IOrganizer, IEvent> {
    public class Host   : One { }
    public class Events : Many { }
}

public class Attendance : ManyToMany<IEvent, IAttendee> {
    public class Attendees : ManyTo { }
    public class Events    : ManyFrom { }
}

public class Friends : ManyMany<IAttendee> {
    public class Peers : Many { }
}

[Relation(DisallowCircularReferences = true)]
public class VenueTree : OneToMany<IVenue, IVenue> {
    public class Parent   : One { }
    public class Children : Many { }
}