Вынесение модели в отдельный проект

Pf2eModel/Model/Structure/BackgroundRelation/BackgroundBoost.cs

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+using Pf2eModel.Model.Enum;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Pf2eModel.Model.Structure.BackgroundRelation;
+
+public partial class BackgroundBoost
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.None)]
+    [Column(Order = 1)]
+    public int Id { get; set; }
+
+    [Column(Order = 2)]
+    public int BackgroundId { get; set; }
+
+    [Column(Order = 3)]
+    public AttributeValues Attribute { get; set; }
+
+    public virtual Background Background { get; set; } = null!;
+}

Pf2eModel/Model/Structure/BackgroundRelation/BackgroundItem.cs

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+using Microsoft.EntityFrameworkCore;
+using Pf2eModel.Model.Base;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Pf2eModel.Model.Structure.BackgroundRelation;
+
+[PrimaryKey(nameof(BackgroundId), nameof(EntityId))]
+public partial class BackgroundItem
+{
+    [Column(Order = 1)]
+    public int BackgroundId { get; set; }
+
+    [Column(Order = 2)]
+    public int EntityId { get; set; }
+
+    [Column(Order = 3)]
+    public int? Level { get; set; }
+
+    public virtual Background Background { get; set; } = null!;
+
+    public virtual Entity Entity { get; set; } = null!;
+}

Pf2eModel/Model/Structure/BackgroundRelation/BackgroundTraining.cs

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+using Pf2eModel.Model.Common;
+using Pf2eModel.Model.Enum;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Pf2eModel.Model.Structure.BackgroundRelation;
+
+public partial class BackgroundTraining
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.None)]
+    [Column(Order = 1)]
+    public int Id { get; set; }
+
+    [Column(Order = 2)]
+    public int BackgroundId { get; set; }
+
+    [Column(Order = 3)]
+    public int TrainingId { get; set; }
+
+    [Column(Order = 4)]
+    public TrainingStage Level { get; set; }
+
+    public virtual Background Background { get; set; } = null!;
+
+    public virtual Training Training { get; set; } = null!;
+}