create all the model needed

WorldBuilder/Models/AttributeDefinition.swift

@@ -0,0 +1,27 @@
+//
+//  AttributeDefinition.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 06/09/2026.
+//
+
+import SwiftData
+import Foundation
+
+@Model
+class AttributeDefinition {
+    var id: UUID
+    var createdAt: Date
+    var updatedAt: Date
+    
+    var name : String
+    var type : AttributeType
+    
+    init(name: String, type: AttributeType){
+        self.id = UUID()
+        self.createdAt = Date()
+        self.updatedAt = Date()
+        self.name = name
+        self.type = type
+    }
+}

WorldBuilder/Models/AttributeType.swift

@@ -0,0 +1,14 @@
+//
+//  AttributeType.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 06/09/2026.
+//
+
+enum AttributeType : nonisolated Codable {
+    case string
+    case int
+    case double
+    case bool
+    case date
+}

WorldBuilder/Models/Entity.swift

@@ -0,0 +1,33 @@
+//
+//  Entity.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 05/09/2026.
+//
+
+import SwiftData
+import Foundation
+
+@Model
+class Entity {
+    var id : UUID
+    var createdAt : Date
+    var updatedAt : Date
+    
+    var name : String
+    var world : World
+    var worldEntityType : WorldEntityType
+    @Relationship var enabledLocalAttributeDefinitions = [AttributeDefinition]()
+    @Relationship var personalAttributeDefinitions = [AttributeDefinition]()
+
+    
+    
+    init(name: String, world: World, worldEntityType: WorldEntityType){
+        self.id = UUID()
+        self.createdAt = Date()
+        self.updatedAt = Date()
+        self.name = name
+        self.world = world
+        self.worldEntityType = worldEntityType
+    }
+}

WorldBuilder/Models/EntityType.swift

@@ -0,0 +1,27 @@
+//
+//  EntityType.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 05/09/2026.
+//
+
+import SwiftData
+import Foundation
+
+@Model
+class EntityType {
+    var id : UUID
+    var createdAt : Date
+    var updatedAt : Date
+    
+    var name : String
+    @Relationship var globalAttributeDefinitions = [AttributeDefinition]()
+    
+    
+    init(name: String) {
+        self.id = UUID()
+        self.createdAt = Date()
+        self.updatedAt = Date()
+        self.name = name
+    }
+}

WorldBuilder/Models/Relation.swift

@@ -0,0 +1,31 @@
+//
+//  Relation.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 06/09/2026.
+//
+
+import SwiftData
+import Foundation
+
+@Model
+class Relation{
+    var id : UUID
+    var createdAt : Date
+    var updatedAt : Date
+    
+    var label : String
+    var source : RelationEndpoint
+    var target : RelationEndpoint
+    var world : World
+    
+    init(label: String, source : RelationEndpoint, target : RelationEndpoint, world : World){
+        self.id = UUID()
+        self.createdAt = Date()
+        self.updatedAt = Date()
+        self.label = label
+        self.source = source
+        self.target = target
+        self.world = world
+    }
+}

WorldBuilder/Models/RelationEndpoint.swift

@@ -0,0 +1,14 @@
+//
+//  RelationEndpoint.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 06/09/2026.
+//
+
+import Foundation
+
+enum RelationEndpoint : nonisolated Codable, Equatable {
+    case entityType(id: UUID)
+    case worldEntityType(id: UUID)
+    case entity(id: UUID)
+}

WorldBuilder/Models/World.swift

@@ -13,9 +13,12 @@ class World {
     var id : UUID
     var createdAt : Date
     var updatedAt : Date
+    
     var name : String
     var overview : String
     @Attribute(.externalStorage) var illustrationData : Data?
+    @Relationship var relations = [Relation]()
+    
     
     init(name: String, overview: String, illustrationData: Data?) {
         self.id = UUID()

WorldBuilder/Models/WorldEntityType.swift

@@ -0,0 +1,29 @@
+//
+//  WorldEntityType.swift
+//  WorldBuilder
+//
+//  Created by Giovanni Josserand on 06/09/2026.
+//
+
+import SwiftData
+import Foundation
+
+@Model
+class WorldEntityType {
+    var id : UUID
+    var createdAt : Date
+    var updatedAt : Date
+    
+    var world : World
+    var entityType : EntityType
+    @Relationship var enabledGlobalAttributeDefinitions = [AttributeDefinition]()
+    @Relationship var localAttributeDefinitions = [AttributeDefinition]()
+    
+    init(world: World, entityType: EntityType){
+        self.id = UUID()
+        self.createdAt = Date()
+        self.updatedAt = Date()
+        self.world = world
+        self.entityType = entityType
+    }
+}