diff --git a/PuferFishContracts/PuferFishContracts.sln b/PuferFishContracts/PuferFishContracts.sln
index 367e681..c91b348 100644
--- a/PuferFishContracts/PuferFishContracts.sln
+++ b/PuferFishContracts/PuferFishContracts.sln
@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PuferFishTests", "PuferFish
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PuferFishBusinessLogic", "PuferFishBusinessLogic\PuferFishBusinessLogic.csproj", "{6997CEC9-5AB7-40C0-9873-E51D2674187B}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PuferFishDataBase", "PuferFishDataBase\PuferFishDataBase.csproj", "{B50100BC-3D08-48A8-921D-1EB5D1FE8674}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{6997CEC9-5AB7-40C0-9873-E51D2674187B}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6997CEC9-5AB7-40C0-9873-E51D2674187B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{6997CEC9-5AB7-40C0-9873-E51D2674187B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B50100BC-3D08-48A8-921D-1EB5D1FE8674}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B50100BC-3D08-48A8-921D-1EB5D1FE8674}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B50100BC-3D08-48A8-921D-1EB5D1FE8674}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B50100BC-3D08-48A8-921D-1EB5D1FE8674}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/PuferFishContracts/PuferFishDataBase/Models/Buyer.cs b/PuferFishContracts/PuferFishDataBase/Models/Buyer.cs
new file mode 100644
index 0000000..1a912a8
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/Buyer.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PuferFishDataBase.Models;
+
+internal class Buyer
+{
+    public required string Id { get; set; }
+    public required string FIO { get; set; }
+    public required string PhoneNumber { get; set; }
+    public double Points { get; set; }
+
+    [ForeignKey("BuyerId")]
+    public List<Sale>? Sales { get; set; }
+
+    [ForeignKey("BuyerId")]
+    public List<Points>? Pointss { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/Points.cs b/PuferFishContracts/PuferFishDataBase/Models/Points.cs
new file mode 100644
index 0000000..45768c9
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/Points.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PuferFishDataBase.Models;
+
+internal class Points
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string BuyerId { get; set; }
+    public DateTime PointsDate { get; set; }
+    public double BuyerPoints { get; set; }
+
+    public Buyer? Buyer { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/Post.cs b/PuferFishContracts/PuferFishDataBase/Models/Post.cs
new file mode 100644
index 0000000..9fea303
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/Post.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using PuferFishContracts.Enums;
+
+namespace PuferFishDataBase.Models;
+
+internal class Post
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string PostId { get; set; }
+    public required string PostName { get; set; }
+    public PostType PostType { get; set; }
+    public double Salary { get; set; }
+    public bool IsActual { get; set; }
+    public DateTime ChangeDate { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/Product.cs b/PuferFishContracts/PuferFishDataBase/Models/Product.cs
new file mode 100644
index 0000000..7bd79cf
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/Product.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using PuferFishContracts.Enums;
+
+namespace PuferFishDataBase.Models;
+
+internal class Product
+{
+    public required string Id { get; set; }
+    public required string ProductName { get; set; }
+    public ProductType ProductType { get; set; }
+    public double Price { get; set; }
+    public bool IsDeleted { get; set; }
+    public string? PrevProductName { get; set; }
+    public string? PrevPrevProductName { get; set; }
+
+    [ForeignKey("ProductId")]
+    public List<ProductHistory>? ProductHistories { get; set; }
+    [ForeignKey("ProductId")]
+    public List<SaleProduct>? SaleProducts { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/ProductHistory.cs b/PuferFishContracts/PuferFishDataBase/Models/ProductHistory.cs
new file mode 100644
index 0000000..669832c
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/ProductHistory.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PuferFishDataBase.Models;
+
+internal class ProductHistory
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string ProductId { get; set; }
+    public double OldPrice { get; set; }
+    public DateTime ChangeDate { get; set; } = DateTime.UtcNow;
+
+    public Product? Product { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/Sale.cs b/PuferFishContracts/PuferFishDataBase/Models/Sale.cs
new file mode 100644
index 0000000..d23b244
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/Sale.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PuferFishDataBase.Models;
+internal class Sale
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string WorkerId { get; set; }
+    public string? BuyerId { get; set; }
+    public DateTime SaleDate { get; set; }
+    public double Sum { get; set; }
+    public double Points { get; set; }
+    public bool IsCancel { get; set; }
+    public Worker? Worker { get; set; }
+    public Buyer? Buyer { get; set; }
+
+    [ForeignKey("SaleId")]
+    public List<SaleProduct>? SaleProducts { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/SaleProduct.cs b/PuferFishContracts/PuferFishDataBase/Models/SaleProduct.cs
new file mode 100644
index 0000000..adefae7
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/SaleProduct.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PuferFishDataBase.Models;
+
+internal class SaleProduct
+{
+    public required string SaleId { get; set; }
+    public required string ProductId { get; set; }
+    public int Count { get; set; }
+    public double Price { get; set; }
+
+    public Sale? Sale { get; set; }
+    public Product? Product { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/Models/Worker.cs b/PuferFishContracts/PuferFishDataBase/Models/Worker.cs
new file mode 100644
index 0000000..626a65c
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/Models/Worker.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PuferFishDataBase.Models;
+
+internal class Worker
+{
+    public required string Id { get; set; }
+    public required string FIO { get; set; }
+    public required string PostId { get; set; }
+    public DateTime BirthDate { get; set; }
+    public DateTime EmploymentDate { get; set; }
+    public bool IsDeleted { get; set; }
+}
diff --git a/PuferFishContracts/PuferFishDataBase/PuferFishDataBase.csproj b/PuferFishContracts/PuferFishDataBase/PuferFishDataBase.csproj
new file mode 100644
index 0000000..0adc9e6
--- /dev/null
+++ b/PuferFishContracts/PuferFishDataBase/PuferFishDataBase.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PuferFishContracts\PuferFishContracts.csproj" />
+  </ItemGroup>
+
+</Project>