забыл убрать комментарий))

FurnitureAssembly/FurnitureAssembly.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FurnitureAssemblyTests", "F
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FurnitureAssemblyBusinessLogic", "FurnitureAssemblyBusinessLogic\FurnitureAssemblyBusinessLogic.csproj", "{698BF48B-C9AC-4684-8150-52E8148F15A0}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FurnitureAssemblyDatebase", "FurnitureAssemblyDatebase\FurnitureAssemblyDatebase.csproj", "{BDE6EBBB-E735-408D-B34B-490C2AE9201B}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{698BF48B-C9AC-4684-8150-52E8148F15A0}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{698BF48B-C9AC-4684-8150-52E8148F15A0}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{698BF48B-C9AC-4684-8150-52E8148F15A0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BDE6EBBB-E735-408D-B34B-490C2AE9201B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BDE6EBBB-E735-408D-B34B-490C2AE9201B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BDE6EBBB-E735-408D-B34B-490C2AE9201B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BDE6EBBB-E735-408D-B34B-490C2AE9201B}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

FurnitureAssembly/FurnitureAssemblyContracts/DataModels/ComponentDataModel.cs

@@ -5,13 +5,13 @@ using FurnitureAssemblyContracts.Infrastructure;
 
 namespace FurnitureAssemblyContracts.DataModels;
 
-public class ComponentDataModel(string id, string name, ComponentType componentType, string? prevName = null, string? prevPrevName = null) : IValidation
+public class ComponentDataModel(string id, string name, ComponentType type, string? prevName = null, string? prevPrevName = null) : IValidation
 {
     public string Id { get; private set; } = id;
     public string Name { get; private set; } = name;
     public string? PrevName { get; private set; } = prevName;
     public string? PrevPrevName { get; private set; } = prevPrevName;
-    public ComponentType Type { get; private set; } = componentType;
+    public ComponentType Type { get; private set; } = type;
 
     public void Validate()
     {

FurnitureAssembly/FurnitureAssemblyContracts/DataModels/PostDataModel.cs

@@ -5,9 +5,9 @@ using FurnitureAssemblyContracts.Infrastructure;
 
 namespace FurnitureAssemblyContracts.DataModels;
 
-public class PostDataModel(string id, string postName, PostType postType, double salary, bool isActual, DateTime changeDate) : IValidation
+public class PostDataModel(string postid, string postName, PostType postType, double salary, bool isActual, DateTime changeDate) : IValidation
 {
-    public string Id { get; private set; } = id;
+    public string Id { get; private set; } = postid;
     public string PostName { get; private set; } = postName;
     public PostType PostType { get; private set; } = postType;
     public double Salary { get; private set; } = salary;

FurnitureAssembly/FurnitureAssemblyContracts/Exceptions/ElementDeletedException.cs

@@ -0,0 +1,6 @@
+namespace FurnitureAssemblyContracts.Exceptions;
+
+public class ElementDeletedException : Exception
+{
+    public ElementDeletedException(string id) : base($"Cannot modify a deleted item(id: { id})") { }
+}

FurnitureAssembly/FurnitureAssemblyContracts/Infrastructure/IConfigurationDatabase.cs

@@ -0,0 +1,7 @@
+namespace FurnitureAssemblyContracts.Infrastructure;
+
+public interface IConfigurationDatabase
+{
+    string ConnectionString { get; }
+}
+

FurnitureAssembly/FurnitureAssemblyDatebase/FurnitureAssemblyDatebase.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AutoMapper" Version="14.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.2" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FurnitureAssemblyContracts\FurnitureAssemblyContracts.csproj" />
+  </ItemGroup>
+
+</Project>

FurnitureAssembly/FurnitureAssemblyDatebase/FurnitureAssemblyDbContext.cs

@@ -0,0 +1,52 @@
+using FurnitureAssemblyContracts.Infrastructure;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyDatebase;
+
+public class FurnitureAssemblyDbContext(IConfigurationDatabase configurationDatabase) : DbContext
+{
+    private readonly IConfigurationDatabase? _configurationDatabase = configurationDatabase;
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        optionsBuilder.UseNpgsql(_configurationDatabase?.ConnectionString, o
+        => o.SetPostgresVersion(12, 2));
+        base.OnConfiguring(optionsBuilder);
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        modelBuilder.Entity<Component>().HasIndex(x => x.Name).IsUnique();
+
+        modelBuilder.Entity<Furniture>().HasIndex(x => x.Name).IsUnique();
+
+        modelBuilder.Entity<Post>()
+            .HasIndex(e => new { e.PostName, e.IsActual })
+            .IsUnique()
+            .HasFilter($"\"{nameof(Post.IsActual)}\" = TRUE");
+
+        modelBuilder.Entity<Post>()
+            .HasIndex(e => new { e.PostId, e.IsActual })
+            .IsUnique()
+            .HasFilter($"\"{nameof(Post.IsActual)}\" = TRUE");
+
+        modelBuilder.Entity<FurnitureComponent>().HasKey(x => new { x.FurnitureId, x.ComponentId });
+
+        modelBuilder.Entity<FurnitureComponent>()
+           .HasOne(fc => fc.Furniture)
+           .WithMany(f => f.Components)
+           .HasForeignKey(fc => fc.FurnitureId)
+           .OnDelete(DeleteBehavior.Restrict);
+    }
+
+    public DbSet<ManifacturingFurniture> Manufacturing { get; set; }
+    public DbSet<Post> Posts { get; set; }
+    public DbSet<Component> Components { get; set; }
+    public DbSet<Salary> Salaries { get; set; }
+    public DbSet<Furniture> Furnitures { get; set; }
+    public DbSet<FurnitureComponent> FurnitureComponents { get; set; }
+    public DbSet<Worker> Workers { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Implementations/ComponentStorageContract.cs

@@ -0,0 +1,159 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyContracts.StoragesContracts;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+
+namespace FurnitureAssemblyDatebase.Implementations;
+
+public class ComponentStorageContract : IComponentStorageContract
+{
+    private readonly FurnitureAssemblyDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public ComponentStorageContract(FurnitureAssemblyDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.AddMaps(typeof(Component));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<ComponentDataModel> GetList()
+    {
+        try
+        {
+            return [.. _dbContext.Components.Select(x => _mapper.Map<ComponentDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ComponentDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<ComponentDataModel>(GetComponentById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ComponentDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return _mapper.Map<ComponentDataModel>(_dbContext.Components.FirstOrDefault(x => x.Name == name));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ComponentDataModel? GetElementByOldName(string name)
+    {
+        try
+        {
+            return _mapper.Map<ComponentDataModel>(_dbContext.Components.FirstOrDefault(x =>
+                x.PrevName == name || x.PrevPrevName == name));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(ComponentDataModel manufacturerDataModel)
+    {
+        try
+        {
+            _dbContext.Components.Add(_mapper.Map<Component>(manufacturerDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", manufacturerDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Components_Name" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Name", manufacturerDataModel.Name);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(ComponentDataModel manufacturerDataModel)
+    {
+        try
+        {
+            var element = GetComponentById(manufacturerDataModel.Id) ?? throw new ElementNotFoundException(manufacturerDataModel.Id);
+            if (element.Name != manufacturerDataModel.Name)
+            {
+                element.PrevPrevName = element.PrevName;
+                element.PrevName = element.Name;
+                element.Name = manufacturerDataModel.Name;
+            }
+            if (element.Type != manufacturerDataModel.Type)
+            {
+                element.Type = manufacturerDataModel.Type;
+            }
+            _dbContext.Components.Update(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Components_Name" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Name", manufacturerDataModel.Name);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetComponentById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Components.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Component? GetComponentById(string id) => _dbContext.Components.FirstOrDefault(x => x.Id == id);
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Implementations/FurnitureStorageContract.cs

@@ -0,0 +1,136 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyContracts.StoragesContracts;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+
+namespace FurnitureAssemblyDatebase;
+
+public class FurnitureStorageContract : IFurnitureStorageContract
+{
+    private readonly FurnitureAssemblyDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public FurnitureStorageContract(FurnitureAssemblyDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Furniture, FurnitureDataModel>();
+            cfg.CreateMap<FurnitureDataModel, Furniture>();
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<FurnitureDataModel> GetList()
+    {
+        try
+        {
+            return [.. _dbContext.Furnitures.Select(x => _mapper.Map<FurnitureDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public FurnitureDataModel GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<FurnitureDataModel>(GetFurnitureById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public FurnitureDataModel GetElementByName(string name)
+    {
+        try
+        {
+            return _mapper.Map<FurnitureDataModel>(_dbContext.Furnitures.FirstOrDefault(x => x.Name == name));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(FurnitureDataModel furnitureDataModel)
+    {
+        try
+        {
+            _dbContext.Furnitures.Add(_mapper.Map<Furniture>(furnitureDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", furnitureDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Furnitures_Name" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Name", furnitureDataModel.Name);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(FurnitureDataModel furnitureDataModel)
+    {
+        try
+        {
+            var element = GetFurnitureById(furnitureDataModel.Id) ?? throw new ElementNotFoundException(furnitureDataModel.Id);
+            _dbContext.Furnitures.Update(_mapper.Map(furnitureDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Furnitures_Name" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Name", furnitureDataModel.Name);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetFurnitureById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Furnitures.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Furniture? GetFurnitureById(string id) => _dbContext.Furnitures.FirstOrDefault(x => x.Id == id);
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Implementations/ManifacturingStorageContract.cs

@@ -0,0 +1,106 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyContracts.StoragesContracts;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+
+namespace FurnitureAssemblyDatebase.Implementations;
+
+public class ManifacturingStorageContract : IManifacturingStorageContract
+{
+    private readonly FurnitureAssemblyDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public ManifacturingStorageContract(FurnitureAssemblyDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<ManifacturingFurniture, ManifacturingFurnitureDataModel>();
+            cfg.CreateMap<ManifacturingFurnitureDataModel, ManifacturingFurniture>();
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<ManifacturingFurnitureDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? workerId = null, string? furnitureId = null)
+    {
+        try
+        {
+            var query = _dbContext.Manufacturing.AsQueryable();
+            if (startDate is not null && endDate is not null)
+            {
+                query = query.Where(x => x.ProductuionDate >= startDate && x.ProductuionDate < endDate);
+            }
+            if (workerId is not null)
+            {
+                query = query.Where(x => x.WorkerId == workerId);
+            }
+            if (furnitureId is not null)
+            {
+                query = query.Where(x => x.FurnitureId == furnitureId);
+            }
+            return [.. query.Select(x => _mapper.Map<ManifacturingFurnitureDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ManifacturingFurnitureDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<ManifacturingFurnitureDataModel>(GetManifacturingById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(ManifacturingFurnitureDataModel manifacturingFurnitureDataModel)
+    {
+        try
+        {
+            _dbContext.Manufacturing.Add(_mapper.Map<ManifacturingFurniture>(manifacturingFurnitureDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(ManifacturingFurnitureDataModel manifacturingFurnitureDataModel)
+    {
+        try
+        {
+            var element = GetManifacturingById(manifacturingFurnitureDataModel.Id) ?? throw new ElementNotFoundException(manifacturingFurnitureDataModel.Id);
+            _dbContext.Manufacturing.Update(_mapper.Map(manifacturingFurnitureDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Manifacturing_Id" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostId", manifacturingFurnitureDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private ManifacturingFurniture? GetManifacturingById(string id) => _dbContext.Manufacturing.FirstOrDefault(x => x.Id == id);
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Implementations/PostStorageContract.cs

@@ -0,0 +1,192 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyContracts.StoragesContracts;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using System.Xml.Linq;
+
+namespace FurnitureAssemblyDatebase.Implementations;
+
+public class PostStorageContract : IPostStorageContract
+{
+    private readonly FurnitureAssemblyDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public PostStorageContract(FurnitureAssemblyDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Post, PostDataModel>()
+                .ForMember(x => x.Id, x => x.MapFrom(src => src.PostId));
+            cfg.CreateMap<PostDataModel, Post>()
+                .ForMember(x => x.Id, x => x.Ignore())
+                .ForMember(x => x.PostId, x => x.MapFrom(src => src.Id))
+                .ForMember(x => x.IsActual, x => x.MapFrom(src => true))
+                .ForMember(x => x.ChangeDate, x => x.MapFrom(src => DateTime.UtcNow));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<PostDataModel> GetList(bool onlyActual = true)
+    {
+        try
+        {
+            var query = _dbContext.Posts.AsQueryable();
+            if (onlyActual)
+            {
+                query = query.Where(x => x.IsActual);
+            }
+            return [.. query.Select(x => _mapper.Map<PostDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+
+    }
+
+    public PostDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<PostDataModel>(_dbContext.Posts.FirstOrDefault(x => x.PostId == id && x.IsActual));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public PostDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return _mapper.Map<PostDataModel>(_dbContext.Posts.FirstOrDefault(x => x.PostName == name && x.IsActual));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<PostDataModel> GetPostWithHistory(string postId)
+    {
+        try
+        {
+            return [.. _dbContext.Posts.Where(x => x.PostId == postId).Select(x => _mapper.Map<PostDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(PostDataModel postDataModel)
+    {
+        try
+        {
+            _dbContext.Posts.Add(_mapper.Map<Post>(postDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Posts_PostName_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostName", postDataModel.PostName);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Posts_PostId_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostId", postDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(PostDataModel postDataModel)
+    {
+        try
+        {
+            var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                var element = GetPostById(postDataModel.Id) ?? throw new ElementNotFoundException(postDataModel.Id);
+                if (!element.IsActual)
+                {
+                    throw new ElementDeletedException(postDataModel.Id);
+                }
+                element.IsActual = false;
+                _dbContext.SaveChanges();
+                var newElement = _mapper.Map<Post>(postDataModel);
+                _dbContext.Posts.Add(newElement);
+                _dbContext.SaveChanges();
+                transaction.Commit();
+            }
+            catch
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Posts_PostName_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostName", postDataModel.PostName);
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetPostById(id) ?? throw new ElementNotFoundException(id);
+            if (!element.IsActual)
+            {
+                throw new ElementDeletedException(id);
+            }
+            element.IsActual = false;
+            _dbContext.SaveChanges();
+        }
+        catch
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+
+    public void ResElement(string id)
+    {
+        try
+        {
+            var element = GetPostById(id) ?? throw new ElementNotFoundException(id);
+            element.IsActual = true;
+            _dbContext.SaveChanges();
+        }
+        catch
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+
+    private Post? GetPostById(string id) => _dbContext.Posts.Where(x => x.PostId == id).OrderByDescending(x => x.ChangeDate).FirstOrDefault();
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Implementations/SalaryStorageContract.cs

@@ -0,0 +1,56 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyContracts.StoragesContracts;
+using FurnitureAssemblyDatebase.Models;
+
+namespace FurnitureAssemblyDatebase.Implementations;
+
+public class SalaryStorageContract : ISalaryStorageContract
+{
+    private readonly FurnitureAssemblyDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public SalaryStorageContract(FurnitureAssemblyDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Salary, SalaryDataModel>();
+            cfg.CreateMap<SalaryDataModel, Salary>()
+                .ForMember(dest => dest.WorkerSalary, opt => opt.MapFrom(src => src.Salary));
+        });
+        _mapper = new Mapper(config);
+    }
+    public List<SalaryDataModel> GetList(DateTime startDate, DateTime endDate, string? workerId = null)
+    {
+        try
+        {
+            var query = _dbContext.Salaries.Where(x => x.SalaryDate >= startDate && x.SalaryDate <= endDate);
+            if (workerId is not null)
+            {
+                query = query.Where(x => x.WorkerId == workerId);
+            }
+            return [.. query.Select(x => _mapper.Map<SalaryDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(SalaryDataModel salaryDataModel)
+    {
+        try
+        {
+            _dbContext.Salaries.Add(_mapper.Map<Salary>(salaryDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }   
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Implementations/WorkerStorageContract.cs

@@ -0,0 +1,143 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyContracts.StoragesContracts;
+using FurnitureAssemblyDatebase.Models;
+
+namespace FurnitureAssemblyDatebase.Implementations;
+
+public class WorkerStorageContract : IWorkerStorageContract
+{
+    private readonly FurnitureAssemblyDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public WorkerStorageContract(FurnitureAssemblyDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Worker, WorkerDataModel>();
+            cfg.CreateMap<WorkerDataModel, Worker>();
+        }); 
+        _mapper = new Mapper(config);
+    }
+
+    public List<WorkerDataModel> GetList(bool onlyActive = true, string? postId = null, DateTime? fromBirthDate = null, DateTime? toBirthDate = null, DateTime? fromEmploymentDate = null, DateTime? toEmploymentDate = null)
+    {
+        try
+        {
+            var query = _dbContext.Workers.AsQueryable();
+            if (onlyActive)
+            {
+                query = query.Where(x => !x.IsDeleted);
+            }
+            if (postId is not null)
+            {
+                query = query.Where(x => x.PostId == postId);
+            }
+            if (fromBirthDate is not null && toBirthDate is not null)
+            {
+                query = query.Where(x => x.BirthDate >= fromBirthDate && x.BirthDate <= toBirthDate);
+            }
+            if (fromEmploymentDate is not null && toEmploymentDate is not null)
+            {
+                query = query.Where(x => x.EmploymentDate >= fromEmploymentDate && x.EmploymentDate <= toEmploymentDate);
+            }
+            return [.. query.Select(x => _mapper.Map<WorkerDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public WorkerDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<WorkerDataModel>(GetWorkerById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public WorkerDataModel? GetElementByFIO(string fio)
+    {
+        try
+        {
+            return
+            _mapper.Map<WorkerDataModel>(_dbContext.Workers.FirstOrDefault(x => x.FIO == fio));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(WorkerDataModel workerDataModel)
+    {
+        try
+        {
+            _dbContext.Workers.Add(_mapper.Map<Worker>(workerDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", workerDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(WorkerDataModel workerDataModel)
+    {
+        try
+        {
+            var element = GetWorkerById(workerDataModel.Id) ?? throw new ElementNotFoundException(workerDataModel.Id);
+            _dbContext.Workers.Update(_mapper.Map(workerDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetWorkerById(id) ?? throw new
+            ElementNotFoundException(id);
+            element.IsDeleted = true;
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Worker? GetWorkerById(string id) => _dbContext.Workers.FirstOrDefault(x => x.Id == id && !x.IsDeleted);
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/Component.cs

@@ -0,0 +1,18 @@
+using AutoMapper;
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Enums;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FurnitureAssemblyDatebase.Models;
+
+[AutoMap(typeof(ComponentDataModel), ReverseMap = true)]
+public class Component
+{
+    public required string Id { get; set; }
+    public required string Name { get; set; }
+    public string? PrevName { get; set; }    
+    public string? PrevPrevName { get; set; }
+    public required ComponentType Type { get; set; }
+    [ForeignKey("ComponentId")]
+    public List<FurnitureComponent>? FurnitureComponents { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/Furniture.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FurnitureAssemblyDatebase.Models;
+
+public class Furniture
+{
+    public required string Id { get; set; }
+    public required string Name { get; set; }
+    public int Weight { get; set; }
+    [ForeignKey("FurnitureId")]
+    public List<FurnitureComponent>? Components { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/FurnitureComponent.cs

@@ -0,0 +1,10 @@
+namespace FurnitureAssemblyDatebase.Models;
+
+public class FurnitureComponent
+{
+    public required string FurnitureId { get; set; }
+    public required string ComponentId { get; set; }
+    public int Count { get; set; }
+    public Furniture? Furniture { get; set; }
+    public Component? Component { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/ManifacturingFurniture.cs

@@ -0,0 +1,12 @@
+namespace FurnitureAssemblyDatebase.Models;
+
+public class ManifacturingFurniture
+{
+    public required string Id { get; set; }
+    public required string FurnitureId { get; set; }
+    public int Count { get; set; }
+    public DateTime ProductuionDate { get; set; }
+    public required string WorkerId { get; set ; }
+    public Furniture? Furniture { get; set; }
+    public Worker? Worker { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/Post.cs

@@ -0,0 +1,14 @@
+using FurnitureAssemblyContracts.Enums;
+
+namespace FurnitureAssemblyDatebase.Models;
+
+public 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; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/Salary.cs

@@ -0,0 +1,10 @@
+namespace FurnitureAssemblyDatebase.Models;
+
+public class Salary
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string WorkerId { get; set; }
+    public double WorkerSalary { get; set; }
+    public DateTime SalaryDate { get; set; }
+    public Worker? Worker { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyDatebase/Models/Worker.cs

@@ -0,0 +1,19 @@
+using FurnitureAssemblyContracts.Enums;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FurnitureAssemblyDatebase.Models;
+
+public 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; }
+    public DateTime ChangeDate { get; set; }
+    [ForeignKey("WorkerId")]
+    public List<Salary>? Salaries { get; set; }
+    [ForeignKey("WorkerId")]
+    public List<ManifacturingFurniture>? ManifacturingFurniture { get; set; }
+}

FurnitureAssembly/FurnitureAssemblyTests/FurnitureAssemblyTests.csproj

@@ -20,6 +20,7 @@
   <ItemGroup>
     <ProjectReference Include="..\FurnitureAssemblyBusinessLogic\FurnitureAssemblyBusinessLogic.csproj" />
     <ProjectReference Include="..\FurnitureAssemblyContracts\FurnitureAssemblyContracts.csproj" />
+    <ProjectReference Include="..\FurnitureAssemblyDatebase\FurnitureAssemblyDatebase.csproj" />
   </ItemGroup>
 
   <ItemGroup>

FurnitureAssembly/FurnitureAssemblyTests/Infrastructure/ConfigurationDateBaseTest.cs

@@ -0,0 +1,8 @@
+using FurnitureAssemblyContracts.Infrastructure;
+
+namespace FurnitureAssemblyTests.Infrastructure;
+
+public class ConfigurationDateBaseTest : IConfigurationDatabase
+{
+    public string ConnectionString => "Host=127.0.0.1;Port=5432;Database=furnitureassemblytest;";
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/BaseStorageContractTest.cs

@@ -0,0 +1,24 @@
+using FurnitureAssemblyDatebase;
+using FurnitureAssemblyTests.Infrastructure;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+internal abstract class BaseStorageContractTest
+{
+    protected FurnitureAssemblyDbContext FurnitureAssemblyDbContext { get; private set; }
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        FurnitureAssemblyDbContext = new FurnitureAssemblyDbContext(new ConfigurationDateBaseTest());
+        FurnitureAssemblyDbContext.Database.EnsureDeleted();
+        FurnitureAssemblyDbContext.Database.EnsureCreated();
+    }
+
+    [OneTimeTearDown]
+    public void OneTimeTearDown()
+    {
+        FurnitureAssemblyDbContext.Database.EnsureDeleted();
+        FurnitureAssemblyDbContext.Dispose();
+    }
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/ComponentStorageContractTests.cs

@@ -0,0 +1,201 @@
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Enums;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyDatebase.Implementations;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+[TestFixture]
+internal class ComponentStorageContractTests : BaseStorageContractTest
+{
+    private ComponentStorageContract _componentStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _componentStorageContract = new ComponentStorageContract(FurnitureAssemblyDbContext);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Components\" CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var component = InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), "Component 1");
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), "Component 2");
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), "Component 3");
+        var list = _componentStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), component);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _componentStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var component = InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_componentStorageContract.GetElementById(component.Id), component);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _componentStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenHaveRecord_Test()
+    {
+        var component = InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), "Unique Name");
+        AssertElement(_componentStorageContract.GetElementByName(component.Name), component);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenNoRecord_Test()
+    {
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _componentStorageContract.GetElementByName("Non-existent Name"), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementByOldName_WhenHaveRecord_Test()
+    {
+        var component = InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), "Current Name", ComponentType.Panel, "Previous Name", "Old Name");
+        AssertElement(_componentStorageContract.GetElementByOldName(component.PrevName!), component);
+        AssertElement(_componentStorageContract.GetElementByOldName(component.PrevPrevName!), component);
+    }
+
+    [Test]
+    public void Try_GetElementByOldName_WhenNoRecord_Test()
+    {
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _componentStorageContract.GetElementByOldName("Non-existent Old Name"), Is.Null);
+    }
+
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var component = CreateModel(Guid.NewGuid().ToString(), "New Component");
+        _componentStorageContract.AddElement(component);
+        AssertElement(GetComponentFromDatabase(component.Id), component);
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var component = CreateModel(Guid.NewGuid().ToString(), "Unique Name");
+        InsertComponentToDatabaseAndReturn(component.Id);
+        Assert.That(() => _componentStorageContract.AddElement(component), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameName_Test()
+    {
+        var component = CreateModel(Guid.NewGuid().ToString(), "Duplicate Name");
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), component.Name);
+        Assert.That(() => _componentStorageContract.AddElement(component), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var component = CreateModel(Guid.NewGuid().ToString(), "Old Name", ComponentType.Panel, "Previous Name", "Old Name");
+        InsertComponentToDatabaseAndReturn(component.Id, name: component.Name!, type: component.Type!, prevName: component.PrevName!, prevPrevName: component.PrevPrevName!);
+        _componentStorageContract.UpdElement(component);
+        AssertElement(GetComponentFromDatabase(component.Id), component);
+ 
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoChangeName_Test()
+    {
+        var component = CreateModel(Guid.NewGuid().ToString(), "Same Name", ComponentType.Panel, "Previous Name", "Old Name");
+        InsertComponentToDatabaseAndReturn(component.Id, component.Name, component.Type, component.PrevName, component.PrevPrevName);
+        _componentStorageContract.UpdElement(component);
+        AssertElement(GetComponentFromDatabase(component.Id), component);
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _componentStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenHaveRecordWithSameName_Test()
+    {
+        var component = CreateModel(Guid.NewGuid().ToString(), "Duplicate Name");
+        InsertComponentToDatabaseAndReturn(component.Id, "Old Name");
+        InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString(), component.Name);
+        Assert.That(() => _componentStorageContract.UpdElement(component), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var component = InsertComponentToDatabaseAndReturn(Guid.NewGuid().ToString());
+        _componentStorageContract.DelElement(component.Id);
+        var element = GetComponentFromDatabase(component.Id);
+        Assert.That(element, Is.Null);
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _componentStorageContract.DelElement(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    private Component InsertComponentToDatabaseAndReturn(string id, string name = "test", ComponentType type = ComponentType.Panel, string prevName = "prevname", string prevPrevName = "prevprevname")
+    {
+        var component = new Component { Id = id, Name = name, Type = type, PrevName = prevName, PrevPrevName = prevPrevName };
+        FurnitureAssemblyDbContext.Components.Add(component);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return component;
+    }
+
+    private static void AssertElement(ComponentDataModel? actual, Component expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+            Assert.That(actual.PrevName, Is.EqualTo(expected.PrevName));
+            Assert.That(actual.PrevPrevName, Is.EqualTo(expected.PrevPrevName));
+            Assert.That(actual.Type, Is.EqualTo(expected.Type));
+        });
+    }
+
+    private static ComponentDataModel CreateModel(string id, string name = "test", ComponentType type = ComponentType.Panel, string prevName = "prevname", string prevPrevName = "prevprevname")
+        => new(id, name, type, prevName, prevPrevName);
+
+    private Component? GetComponentFromDatabase(string id) => FurnitureAssemblyDbContext.Components.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Component? actual, ComponentDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+            Assert.That(actual.PrevName, Is.EqualTo(expected.PrevName));
+            Assert.That(actual.PrevPrevName, Is.EqualTo(expected.PrevPrevName));
+            Assert.That(actual.Type, Is.EqualTo(expected.Type));
+        });
+    }
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/FurnitureStorageContractTests.cs

@@ -0,0 +1,178 @@
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyDatebase;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+[TestFixture]
+internal class FurnitureStorageContractTests : BaseStorageContractTest
+{
+    private FurnitureStorageContract _furnitureStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _furnitureStorageContract = new FurnitureStorageContract(FurnitureAssemblyDbContext);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Furnitures\" CASCADE;");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var furniture = InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString(), "Furniture 1");
+        InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString(), "Furniture 2");
+        InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString(), "Furniture 3");
+        var list = _furnitureStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), furniture);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _furnitureStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var furniture = InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_furnitureStorageContract.GetElementById(furniture.Id), furniture);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _furnitureStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenHaveRecord_Test()
+    {
+        var furniture = InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString(), "Unique Name");
+        AssertElement(_furnitureStorageContract.GetElementByName(furniture.Name), furniture);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenNoRecord_Test()
+    {
+        InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _furnitureStorageContract.GetElementByName("Non-existent Name"), Is.Null);
+    }
+
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var furniture = CreateModel(Guid.NewGuid().ToString(), "New Furniture");
+        _furnitureStorageContract.AddElement(furniture);
+        AssertElement(GetFurnitureFromDatabase(furniture.Id), furniture);
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var furniture = CreateModel(Guid.NewGuid().ToString(), "Unique Name");
+        InsertFurnitureToDatabaseAndReturn(furniture.Id);
+        Assert.That(() => _furnitureStorageContract.AddElement(furniture), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameName_Test()
+    {
+        var furniture = CreateModel(Guid.NewGuid().ToString(), "Duplicate Name");
+        InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString(), furniture.Name);
+        Assert.That(() => _furnitureStorageContract.AddElement(furniture), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var furniture = CreateModel(Guid.NewGuid().ToString(), "Old Name");
+        InsertFurnitureToDatabaseAndReturn(furniture.Id, name: furniture.Name!);
+        _furnitureStorageContract.UpdElement(furniture);
+        AssertElement(GetFurnitureFromDatabase(furniture.Id), furniture);
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoChangeName_Test()
+    {
+        var furniture = CreateModel(Guid.NewGuid().ToString(), "Same Name");
+        InsertFurnitureToDatabaseAndReturn(furniture.Id, furniture.Name);
+        _furnitureStorageContract.UpdElement(furniture);
+        AssertElement(GetFurnitureFromDatabase(furniture.Id), furniture);
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _furnitureStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenHaveRecordWithSameName_Test()
+    {
+        var furniture = CreateModel(Guid.NewGuid().ToString(), "Duplicate Name");
+        InsertFurnitureToDatabaseAndReturn(furniture.Id, "Old Name");
+        InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString(), furniture.Name);
+        Assert.That(() => _furnitureStorageContract.UpdElement(furniture), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var furniture = InsertFurnitureToDatabaseAndReturn(Guid.NewGuid().ToString());
+        _furnitureStorageContract.DelElement(furniture.Id);
+        var element = GetFurnitureFromDatabase(furniture.Id);
+        Assert.That(element, Is.Null);
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _furnitureStorageContract.DelElement(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    private Furniture InsertFurnitureToDatabaseAndReturn(string id, string name = "test")
+    {
+        var furniture = new Furniture { Id = id, Name = name };
+        FurnitureAssemblyDbContext.Furnitures.Add(furniture);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return furniture;
+    }
+
+    private static void AssertElement(FurnitureDataModel? actual, Furniture expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+        });
+    }
+
+    private static FurnitureDataModel CreateModel(string id, string name = "test", int weight = 0)
+        => new(id, name, weight, []);
+
+    private Furniture? GetFurnitureFromDatabase(string id) => FurnitureAssemblyDbContext.Furnitures.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Furniture? actual, FurnitureDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+        });
+    }
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/ManifacturingStorageContractTests.cs

@@ -0,0 +1,178 @@
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyDatebase.Implementations;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+[TestFixture]
+internal class ManifacturingStorageContractTests : BaseStorageContractTest
+{
+    private ManifacturingStorageContract _manifacturingStorageContract;
+    private Worker _worker;
+    private Furniture _furniture;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _manifacturingStorageContract = new ManifacturingStorageContract(FurnitureAssemblyDbContext);
+        _worker = InsertWorkerToDatabaseAndReturn();
+        _furniture = InsertFurnitureToDatabaseAndReturn();
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Furnitures\" CASCADE;");
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Manufacturing\" CASCADE;");
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Workers\" CASCADE;");    
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var manufacturing = InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        var list = _manifacturingStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), manufacturing);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _manifacturingStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetList_ByWorker_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("Other worker");
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, worker.Id);
+        var list = _manifacturingStorageContract.GetList(workerId: _worker.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+        Assert.That(list.All(x => x.WorkerId == _worker.Id));
+    }
+
+    [Test]
+    public void Try_GetList_ByFurniture_Test()
+    {
+        var furniture = InsertFurnitureToDatabaseAndReturn("Other furniture");
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), furniture.Id, 5, _worker.Id);
+        var list = _manifacturingStorageContract.GetList(furnitureId: _furniture.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+        Assert.That(list.All(x => x.FurnitureId == _furniture.Id));
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var manufacturing = InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        AssertElement(_manifacturingStorageContract.GetElementById(manufacturing.Id), manufacturing);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertManufacturingToDatabaseAndReturn(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        Assert.That(() => _manifacturingStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var manufacturing = CreateModel(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        _manifacturingStorageContract.AddElement(manufacturing);
+        AssertElement(GetManufacturingFromDatabaseById(manufacturing.Id), manufacturing);
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var manufacturing = CreateModel(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(manufacturing.Id, _furniture.Id, 5, _worker.Id);
+        Assert.That(() => _manifacturingStorageContract.AddElement(manufacturing), Throws.TypeOf<StorageException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var manufacturing = CreateModel(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id);
+        InsertManufacturingToDatabaseAndReturn(manufacturing.Id, _furniture.Id, 5, _worker.Id);
+        _manifacturingStorageContract.UpdElement(manufacturing);
+        AssertElement(GetManufacturingFromDatabaseById(manufacturing.Id), manufacturing);
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _manifacturingStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString(), _furniture.Id, 5, _worker.Id)), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    private Worker InsertWorkerToDatabaseAndReturn(string workerFIO = "fio")
+    {
+        var worker = new Worker() { Id = Guid.NewGuid().ToString(), PostId = Guid.NewGuid().ToString(), FIO = workerFIO, IsDeleted = false };
+        FurnitureAssemblyDbContext.Workers.Add(worker);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return worker;
+    }
+
+    private Furniture InsertFurnitureToDatabaseAndReturn(string furnitureName = "furniture", int weight = 5)
+    {
+        var furniture = new Furniture() { Id = Guid.NewGuid().ToString(), Name = furnitureName, Weight = weight };
+        FurnitureAssemblyDbContext.Furnitures.Add(furniture);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return furniture;
+    }
+
+    private ManifacturingFurniture InsertManufacturingToDatabaseAndReturn(string id, string furnitureId, int count, string workerId)
+    {
+        var manufacturing = new ManifacturingFurniture() { Id = id, FurnitureId = furnitureId, Count = count, WorkerId = workerId };
+        FurnitureAssemblyDbContext.Manufacturing.Add(manufacturing);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return manufacturing;
+    }
+
+    private static void AssertElement(ManifacturingFurnitureDataModel? actual, ManifacturingFurniture expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.WorkerId, Is.EqualTo(expected.WorkerId));
+            Assert.That(actual.Count, Is.EqualTo(expected.Count));
+            Assert.That(actual.FurnitureId, Is.EqualTo(expected.FurnitureId));
+        });
+    }
+
+    private static ManifacturingFurnitureDataModel CreateModel(string id, string furnitureId, int count, string workerId)
+    {
+        return new(id, furnitureId, count, workerId);
+    }
+
+    private ManifacturingFurniture? GetManufacturingFromDatabaseById(string id) =>
+        FurnitureAssemblyDbContext.Manufacturing.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(ManifacturingFurniture? actual, ManifacturingFurnitureDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.WorkerId, Is.EqualTo(expected.WorkerId));
+            Assert.That(actual.Count, Is.EqualTo(expected.Count));
+            Assert.That(actual.FurnitureId, Is.EqualTo(expected.FurnitureId));
+        });
+    }
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/PostStorageContractTests.cs

@@ -0,0 +1,337 @@
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Enums;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyDatebase.Implementations;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+[TestFixture]
+internal class PostStorageContractTests : BaseStorageContractTest
+{
+    private PostStorageContract _postStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _postStorageContract = new PostStorageContract(FurnitureAssemblyDbContext);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Posts\"CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(),
+        "name 1");
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 2");
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 3");
+        var list = _postStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(x => x.Id == post.PostId), post);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _postStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetList_OnlyActual_Test()
+    {
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 1", isActual: true);
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 2", isActual: true);
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 3", isActual: false);
+        var list = _postStorageContract.GetList(onlyActual: true);
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+            Assert.That(!list.Any(x => !x.IsActual));
+        });
+    }
+
+    [Test]
+    public void Try_GetList_IncludeNoActual_Test()
+    {
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 1", isActual: true);
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 2", isActual: true);
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 3", isActual: false);
+        var list = _postStorageContract.GetList(onlyActual: false);
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(3));
+            Assert.That(list.Count(x => x.IsActual), Is.EqualTo(2));
+            Assert.That(list.Count(x => !x.IsActual), Is.EqualTo(1));
+        });
+    }
+
+    [Test]
+    public void Try_GetPostWithHistory_WhenHaveRecords_Test()
+    {
+        var postId = Guid.NewGuid().ToString();
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 1", isActual: true);
+        InsertPostToDatabaseAndReturn(postId, "name 2", isActual: true);
+        InsertPostToDatabaseAndReturn(postId, "name 2", isActual: false);
+        var list = _postStorageContract.GetPostWithHistory(postId);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+    }
+
+    [Test]
+    public void Try_GetPostWithHistory_WhenNoRecords_Test()
+    {
+        var postId = Guid.NewGuid().ToString();
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 1", isActual: true);
+        InsertPostToDatabaseAndReturn(postId, "name 2", isActual: true);
+        InsertPostToDatabaseAndReturn(postId, "name 2", isActual: false);
+        var list = _postStorageContract.GetPostWithHistory(Guid.NewGuid().ToString());
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_postStorageContract.GetElementById(post.PostId), post);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _postStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenRecordHasDeleted_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), isActual: false);
+        Assert.That(() => _postStorageContract.GetElementById(post.PostId), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenTrySearchById_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _postStorageContract.GetElementById(post.Id), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenHaveRecord_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_postStorageContract.GetElementByName(post.PostName),
+        post);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenNoRecord_Test()
+    {
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _postStorageContract.GetElementByName("name"), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementByName_WhenRecordHasDeleted_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), isActual: false);
+        Assert.That(() => _postStorageContract.GetElementById(post.PostName), Is.Null);
+    }
+
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString(), isActual: true);
+        _postStorageContract.AddElement(post);
+        AssertElement(GetPostFromDatabaseByPostId(post.Id), post);
+    }
+
+    [Test]
+    public void Try_AddElement_WhenActualIsFalse_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString(), isActual: false);
+        Assert.That(() => _postStorageContract.AddElement(post),
+        Throws.Nothing);
+        AssertElement(GetPostFromDatabaseByPostId(post.Id),
+        CreateModel(post.Id, isActual: true));
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameName_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString(), "name unique", isActual: true);
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), postName: post.PostName, isActual: true);
+        Assert.That(() => _postStorageContract.AddElement(post),
+        Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void
+    Try_AddElement_WhenHaveRecordWithSamePostIdAndActualIsTrue_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString(), isActual: true);
+        InsertPostToDatabaseAndReturn(post.Id, isActual: true);
+        Assert.That(() => _postStorageContract.AddElement(post),
+        Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString());
+        InsertPostToDatabaseAndReturn(post.Id, isActual: true);
+        _postStorageContract.UpdElement(post);
+        var posts = FurnitureAssemblyDbContext.Posts.Where(x => x.PostId == post.Id).OrderByDescending(x => x.ChangeDate);
+        Assert.That(posts.Count(), Is.EqualTo(2));
+        AssertElement(posts.First(), CreateModel(post.Id, isActual: true));
+        AssertElement(posts.Last(), CreateModel(post.Id, isActual: false));
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenActualIsFalse_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString(), isActual: false);
+        InsertPostToDatabaseAndReturn(post.Id, isActual: true);
+        _postStorageContract.UpdElement(post);
+        AssertElement(GetPostFromDatabaseByPostId(post.Id),
+        CreateModel(post.Id, isActual: true));
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _postStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())),
+        Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenHaveRecordWithSameName_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString(), "New Name");
+        InsertPostToDatabaseAndReturn(post.Id, postName: "name");
+        InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), postName: post.PostName);
+        Assert.That(() => _postStorageContract.UpdElement(post),
+        Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenRecordWasDeleted_Test()
+    {
+        var post = CreateModel(Guid.NewGuid().ToString());
+        InsertPostToDatabaseAndReturn(post.Id, isActual: false);
+        Assert.That(() => _postStorageContract.UpdElement(post), Throws.TypeOf<ElementDeletedException>());
+    }
+
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), isActual: true);
+        _postStorageContract.DelElement(post.PostId);
+        var element = GetPostFromDatabaseByPostId(post.PostId);
+        Assert.Multiple(() =>
+        {
+            Assert.That(element, Is.Not.Null);
+            Assert.That(!element!.IsActual);
+        });
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _postStorageContract.DelElement(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_DelElement_WhenRecordWasDeleted_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), isActual: false);
+        Assert.That(() => _postStorageContract.DelElement(post.PostId), Throws.TypeOf<ElementDeletedException>());
+    }
+
+    [Test]
+    public void Try_ResElement_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), isActual: false);
+        _postStorageContract.ResElement(post.PostId);
+        var element = GetPostFromDatabaseByPostId(post.PostId);
+        Assert.Multiple(() =>
+        {
+            Assert.That(element, Is.Not.Null);
+            Assert.That(element!.IsActual);
+        });
+    }
+
+    [Test]
+    public void Try_ResElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _postStorageContract.ResElement(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_ResElement_WhenRecordNotWasDeleted_Test()
+    {
+        var post = InsertPostToDatabaseAndReturn(Guid.NewGuid().ToString(), isActual: true);
+        Assert.That(() => _postStorageContract.ResElement(post.PostId), Throws.Nothing);
+    }
+
+    private Post InsertPostToDatabaseAndReturn(string id, string postName = "test", PostType postType = PostType.Builder, double salary = 10, bool isActual = true, DateTime? changeDate = null)
+    {
+        var post = new Post()
+        {
+            Id = Guid.NewGuid().ToString(),
+            PostId = id,
+            PostName = postName,
+            PostType = postType,
+            Salary = salary,
+            IsActual = isActual,
+            ChangeDate = changeDate ?? DateTime.UtcNow
+        };
+        FurnitureAssemblyDbContext.Posts.Add(post);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return post;
+    }
+
+    private static void AssertElement(PostDataModel? actual, Post expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.PostId));
+            Assert.That(actual.PostName, Is.EqualTo(expected.PostName)); Assert.That(actual.PostType, Is.EqualTo(expected.PostType));
+            Assert.That(actual.Salary, Is.EqualTo(expected.Salary));
+            Assert.That(actual.IsActual, Is.EqualTo(expected.IsActual));
+        });
+    }
+
+    private static PostDataModel CreateModel(string postId, string postName = "test", PostType postType = PostType.Builder, double salary = 10, bool isActual = false, DateTime? changeDate = null)
+        => new(postId, postName, postType, salary, isActual, changeDate ?? DateTime.UtcNow);
+
+    private Post? GetPostFromDatabaseByPostId(string id) => FurnitureAssemblyDbContext.Posts
+        .Where(x => x.PostId == id).OrderByDescending(x => x.ChangeDate).FirstOrDefault();
+
+    private static void AssertElement(Post? actual, PostDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.PostId, Is.EqualTo(expected.Id));
+            Assert.That(actual.PostName, Is.EqualTo(expected.PostName));
+            Assert.That(actual.PostType, Is.EqualTo(expected.PostType));
+            Assert.That(actual.Salary, Is.EqualTo(expected.Salary));
+            Assert.That(actual.IsActual, Is.EqualTo(expected.IsActual));
+        });
+    }
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/SalaryStorageContractTests.cs

@@ -0,0 +1,168 @@
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyDatebase;
+using FurnitureAssemblyDatebase.Implementations;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+[TestFixture]
+internal class SalaryStorageContractTests : BaseStorageContractTest
+{
+    private SalaryStorageContract _salaryStorageContract;
+    private Worker _worker;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _salaryStorageContract = new SalaryStorageContract(FurnitureAssemblyDbContext);
+        _worker = InsertWorkerToDatabaseAndReturn();
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Salaries\"CASCADE; ");
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Workers\"CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var salary = InsertSalaryToDatabaseAndReturn(_worker.Id, workerSalary: 100);
+        InsertSalaryToDatabaseAndReturn(_worker.Id);
+        InsertSalaryToDatabaseAndReturn(_worker.Id);
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-10), DateTime.UtcNow.AddDays(10));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), salary);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-10), DateTime.UtcNow.AddDays(10));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetList_OnlyInDatePeriod_Test()
+    {
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate: DateTime.UtcNow.AddDays(-2));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate: DateTime.UtcNow.AddDays(-1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate: DateTime.UtcNow.AddDays(-1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate: DateTime.UtcNow.AddDays(1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate: DateTime.UtcNow.AddDays(1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate: DateTime.UtcNow.AddDays(-2));
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-1), DateTime.UtcNow.AddDays(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+        });
+    }
+
+    [Test]
+    public void Try_GetList_ByWorker_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("name 2");
+        InsertSalaryToDatabaseAndReturn(_worker.Id);
+        InsertSalaryToDatabaseAndReturn(_worker.Id);
+        InsertSalaryToDatabaseAndReturn(worker.Id);
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-
+        1), DateTime.UtcNow.AddDays(1), _worker.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+            Assert.That(list.All(x => x.WorkerId == _worker.Id));
+        });
+    }
+
+    [Test]
+    public void Try_GetList_ByWorkerOnlyInDatePeriod_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("name 2");
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate:
+        DateTime.UtcNow.AddDays(-2));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate:
+        DateTime.UtcNow.AddDays(-1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(worker.Id, salaryDate:
+        DateTime.UtcNow.AddDays(-1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate:
+        DateTime.UtcNow.AddDays(1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(worker.Id, salaryDate:
+        DateTime.UtcNow.AddDays(1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(_worker.Id, salaryDate:
+        DateTime.UtcNow.AddDays(-2));
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-
+        1), DateTime.UtcNow.AddDays(1), _worker.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+            Assert.That(list.All(x => x.WorkerId == _worker.Id));
+        });
+    }
+
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var salary = CreateModel(_worker.Id);
+        _salaryStorageContract.AddElement(salary);
+        AssertElement(GetSalaryFromDatabaseByWorkerId(_worker.Id), salary);
+    }
+
+    private Worker InsertWorkerToDatabaseAndReturn(string workerFIO = "fio")
+    {
+        var worker = new Worker()
+        {
+            Id = Guid.NewGuid().ToString(),
+            PostId = Guid.NewGuid().ToString(),
+            FIO = workerFIO,
+            IsDeleted = false
+        };
+        FurnitureAssemblyDbContext.Workers.Add(worker);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return worker;
+    }
+
+    private Salary InsertSalaryToDatabaseAndReturn(string workerId, double
+    workerSalary = 1, DateTime? salaryDate = null)
+    {
+        var salary = new Salary()
+        {
+            WorkerId = workerId,
+            WorkerSalary = workerSalary,
+            SalaryDate = salaryDate ?? DateTime.UtcNow
+        };
+        FurnitureAssemblyDbContext.Salaries.Add(salary);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return salary;
+    }
+
+    private static void AssertElement(SalaryDataModel? actual, Salary expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.WorkerId, Is.EqualTo(expected.WorkerId));
+            Assert.That(actual.Salary, Is.EqualTo(expected.WorkerSalary));
+        });
+    }
+    private static SalaryDataModel CreateModel(string workerId, double workerSalary = 1, DateTime? salaryDate = null)
+                    => new(workerId, salaryDate ?? DateTime.UtcNow, workerSalary);
+
+    private Salary? GetSalaryFromDatabaseByWorkerId(string id) => FurnitureAssemblyDbContext.Salaries.FirstOrDefault(x => x.WorkerId == id);
+
+    private static void AssertElement(Salary? actual, SalaryDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.WorkerId, Is.EqualTo(expected.WorkerId));
+            Assert.That(actual.WorkerSalary, Is.EqualTo(expected.Salary));
+        });
+    }
+}

FurnitureAssembly/FurnitureAssemblyTests/StorageContractTests/WorkerStorageContractTests.cs

@@ -0,0 +1,247 @@
+using FurnitureAssemblyContracts.DataModels;
+using FurnitureAssemblyContracts.Exceptions;
+using FurnitureAssemblyDatebase.Implementations;
+using FurnitureAssemblyDatebase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace FurnitureAssemblyTests.StorageContractTests;
+
+[TestFixture]
+internal class WorkerStorageContractTests : BaseStorageContractTest
+{
+    private WorkerStorageContract _workerStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _workerStorageContract = new WorkerStorageContract(FurnitureAssemblyDbContext);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        FurnitureAssemblyDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Workers\"CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1");
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2");
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3");
+        var list = _workerStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), worker);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _workerStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetList_ByPostId_Test()
+    {
+        var postId = Guid.NewGuid().ToString();
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1",
+        postId);
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2",
+        postId);
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3");
+        var list = _workerStorageContract.GetList(postId: postId);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+        Assert.That(list.All(x => x.PostId == postId));
+    }
+
+    [Test]
+    public void Try_GetList_ByBirthDate_Test()
+    {
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1",
+        birthDate: DateTime.UtcNow.AddYears(-25));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2",
+        birthDate: DateTime.UtcNow.AddYears(-21));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3",
+        birthDate: DateTime.UtcNow.AddYears(-20));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 4",
+        birthDate: DateTime.UtcNow.AddYears(-19));
+        var list = _workerStorageContract.GetList(fromBirthDate: DateTime.UtcNow.AddYears(-21).AddMinutes(-1), toBirthDate: DateTime.UtcNow.AddYears(-20).AddMinutes(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+    }
+
+    [Test]
+    public void Try_GetList_ByEmploymentDate_Test()
+    {
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1",
+        employmentDate: DateTime.UtcNow.AddDays(-2));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2",
+        employmentDate: DateTime.UtcNow.AddDays(-1));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3",
+        employmentDate: DateTime.UtcNow.AddDays(1));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 4",
+        employmentDate: DateTime.UtcNow.AddDays(2));
+        var list = _workerStorageContract.GetList(fromEmploymentDate: DateTime.UtcNow.AddDays(-1).AddMinutes(-1), toEmploymentDate: DateTime.UtcNow.AddDays(1).AddMinutes(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+    }
+
+    [Test]
+    public void Try_GetList_ByAllParameters_Test()
+    {
+        var postId = Guid.NewGuid().ToString();
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1", postId, birthDate: DateTime.UtcNow.AddYears(-25), employmentDate: DateTime.UtcNow.AddDays(-2));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2", postId, birthDate: DateTime.UtcNow.AddYears(-22), employmentDate: DateTime.UtcNow.AddDays(-1));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3", postId, birthDate: DateTime.UtcNow.AddYears(-21), employmentDate: DateTime.UtcNow.AddDays(-1));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 4", birthDate: DateTime.UtcNow.AddYears(-20), employmentDate: DateTime.UtcNow.AddDays(1));
+        var list = _workerStorageContract.GetList(postId: postId, fromBirthDate: DateTime.UtcNow.AddYears(-21).AddMinutes(-1),
+            toBirthDate: DateTime.UtcNow.AddYears(-20).AddMinutes(1), fromEmploymentDate: DateTime.UtcNow.AddDays(-1).AddMinutes(-1),
+            toEmploymentDate: DateTime.UtcNow.AddDays(1).AddMinutes(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(1));
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_workerStorageContract.GetElementById(worker.Id), worker);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        Assert.That(() => _workerStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+
+    [Test]
+    public void Try_GetElementByFIO_WhenHaveRecord_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_workerStorageContract.GetElementByFIO(worker.FIO), worker);
+    }
+
+    [Test]
+    public void Try_GetElementByFIO_WhenNoRecord_Test()
+    {
+        Assert.That(() => _workerStorageContract.GetElementByFIO("New Fio"), Is.Null);
+    }
+
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        _workerStorageContract.AddElement(worker);
+        AssertElement(GetWorkerFromDatabase(worker.Id), worker);
+    }
+
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        InsertWorkerToDatabaseAndReturn(worker.Id);
+        Assert.That(() => _workerStorageContract.AddElement(worker), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString(), "New Fio");
+        InsertWorkerToDatabaseAndReturn(worker.Id);
+        _workerStorageContract.UpdElement(worker);
+        AssertElement(GetWorkerFromDatabase(worker.Id), worker);
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _workerStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())),
+        Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWasDeleted_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        InsertWorkerToDatabaseAndReturn(worker.Id, isDeleted: true);
+        Assert.That(() => _workerStorageContract.UpdElement(worker),
+        Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString());
+        _workerStorageContract.DelElement(worker.Id);
+        var element = GetWorkerFromDatabase(worker.Id);
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.IsDeleted);
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _workerStorageContract.DelElement(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWasDeleted_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        InsertWorkerToDatabaseAndReturn(worker.Id, isDeleted: true);
+        Assert.That(() => _workerStorageContract.DelElement(worker.Id), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    private Worker InsertWorkerToDatabaseAndReturn(string id, string fio = "test", string? postId = null, DateTime? birthDate = null, DateTime? employmentDate = null, bool isDeleted = false)
+    {
+        var worker = new Worker()
+        {
+            Id = id,
+            FIO = fio,
+            PostId = postId ?? Guid.NewGuid().ToString(),
+            BirthDate = birthDate ?? DateTime.UtcNow.AddYears(-20),
+            EmploymentDate = employmentDate ?? DateTime.UtcNow,
+            IsDeleted = isDeleted
+        };
+        FurnitureAssemblyDbContext.Workers.Add(worker);
+        FurnitureAssemblyDbContext.SaveChanges();
+        return worker;
+    }
+    private static void AssertElement(WorkerDataModel? actual, Worker expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.PostId, Is.EqualTo(expected.PostId));
+            Assert.That(actual.FIO, Is.EqualTo(expected.FIO));
+            Assert.That(actual.BirthDate, Is.EqualTo(expected.BirthDate));
+            Assert.That(actual.EmploymentDate,
+            Is.EqualTo(expected.EmploymentDate));
+            Assert.That(actual.IsDeleted, Is.EqualTo(expected.IsDeleted));
+        });
+    }
+    private static WorkerDataModel CreateModel(string id, string fio = "fio", string? postId = null, DateTime? birthDate = null, DateTime? employmentDate = null, bool isDeleted = false) =>
+        new(id, fio, postId ?? Guid.NewGuid().ToString(), birthDate ?? DateTime.UtcNow.AddYears(-20), employmentDate ?? DateTime.UtcNow, isDeleted);
+
+    private Worker? GetWorkerFromDatabase(string id) => FurnitureAssemblyDbContext.Workers.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Worker? actual, WorkerDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.PostId, Is.EqualTo(expected.PostId));
+            Assert.That(actual.FIO, Is.EqualTo(expected.FIO));
+            Assert.That(actual.BirthDate, Is.EqualTo(expected.BirthDate));
+            Assert.That(actual.EmploymentDate,Is.EqualTo(expected.EmploymentDate));
+            Assert.That(actual.IsDeleted, Is.EqualTo(expected.IsDeleted));
+        });
+    }
+}