Add project files.

Core.Blueprint.Domain/Entities/AbsEntity.cs

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+using MongoDB.Bson.Serialization.Attributes;
+using MongoDB.Bson;
+
+namespace Core.Blueprint.Domain.Entities
+{
+    public abstract class AbsEntity
+    {
+        [BsonId]
+        [BsonRepresentation(BsonType.ObjectId)]
+        [BsonElement("_id")]
+        public string? Id { get; set; }
+        public char StatusCode { get; set; } = 'P';
+    }
+}

Core.Blueprint.Domain/Entities/AbsFileEntity.cs

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+namespace Core.Blueprint.Domain.Entities
+{
+    public abstract class AbsFileEntity : AbsEntity
+    {
+        public byte[] FileContent { get; set; } = [];
+    }
+}

Core.Blueprint.Domain/Entities/BlueprintCollection.cs

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+using Core.Blueprint.Domain.Shared;
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace Core.Blueprint.Domain.Entities
+{
+    [CollectionAttributeName("blueprint")]
+    public class BlueprintCollection : AbsEntity
+    {
+        public Guid CorrelationId { get; set; }
+
+        public DateTime Created { get; set; }
+
+    }
+}

Core.Blueprint.Domain/Entities/SampleImage.cs

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+namespace Core.Blueprint.Domain.Entities
+{
+    public class SampleImage : AbsFileEntity
+    {
+        
+    }
+}

Core.Blueprint.Domain/Entities/SampleItem.cs

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+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Core.Blueprint.Domain.Entities
+{
+    [Table("Blueprint_Test01")] 
+    public class SampleItem : AbsEntity
+    {
+        public Guid Id { get; set; } = Guid.NewGuid();
+        public string TestName { get; set; } = string.Empty;
+        public char StatusCode { get; set; } = 'P';
+        public int NumValue { get; set; } = 0;
+        public DateTime CreatedAt { get; set; } = DateTime.Now;
+    }
+}
+
+
+//User - Project

Core.Blueprint.Domain/Entities/Secret.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core.Blueprint.Domain.Entities
+{
+    public class Secret
+    {
+        public string? Value { get; set; }
+    }
+}