initial commit

Core/Application/Application.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Domain\Domain.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AutoMapper" Version="13.0.1" />
+    <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="11.11.0" />
+    <PackageReference Include="MediatR" Version="12.4.1" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.0" />
+  </ItemGroup>
+
+</Project>

Core/Application/Common/Behaviors/LoggingBehaviour.cs

@@ -0,0 +1,34 @@
+using MediatR;
+using Microsoft.Extensions.Logging;
+
+namespace Application.Common.Behaviors;
+
+public class LoggingBehaviour<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : notnull
+{
+    private readonly ILogger<TRequest> _logger;
+
+    public LoggingBehaviour(ILogger<TRequest> logger)
+    {
+        _logger = logger;
+    }
+
+    public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+    {
+        var requestName = typeof(TRequest).Name;
+
+        try
+        {
+            _logger.LogInformation($"Try executing {requestName} at {DateTime.UtcNow.ToString()}");
+
+            return await next();
+        }
+        catch (Exception ex)
+        {
+
+            _logger.LogError(ex, $"Error executing {requestName} at {DateTime.UtcNow.ToString()}");
+
+            throw;
+        }
+    }
+}
+

Core/Application/Common/Behaviors/ValidationBehaviour.cs

@@ -0,0 +1,37 @@
+using FluentValidation;
+using MediatR;
+
+namespace Application.Common.Behaviors;
+
+public class ValidationBehaviour<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
+     where TRequest : notnull
+{
+    private readonly IEnumerable<IValidator<TRequest>> _validators;
+
+    public ValidationBehaviour(IEnumerable<IValidator<TRequest>> validators)
+    {
+        _validators = validators;
+    }
+
+    public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+    {
+        if (_validators.Any())
+        {
+            var context = new ValidationContext<TRequest>(request);
+
+            var validationResults = await Task.WhenAll(
+                _validators.Select(v =>
+                    v.ValidateAsync(context, cancellationToken)));
+
+            var failures = validationResults
+                .Where(r => r.Errors.Any())
+                .SelectMany(r => r.Errors)
+                .ToList();
+
+            if (failures.Any())
+                throw new ValidationException(failures);
+        }
+        return await next();
+    }
+}
+

Core/Application/Common/CQS/Commands/ICommandContext.cs

@@ -0,0 +1,5 @@
+namespace Application.Common.CQS.Commands;
+
+public interface ICommandContext
+{
+}

Core/Application/Common/CQS/Queries/IQueryContext.cs

@@ -0,0 +1,9 @@
+using Application.Common.Repositories;
+
+namespace Application.Common.CQS.Queries;
+
+public interface IQueryContext : IEntityDbSet
+{
+    IQueryable<T> Set<T>() where T : class;
+}
+

Core/Application/Common/Extensions/EnumExtensions.cs

@@ -0,0 +1,16 @@
+using System.ComponentModel;
+using System.Reflection;
+
+namespace Application.Common.Extensions;
+
+public static class EnumExtensions
+{
+    public static string ToFriendlyName<TEnum>(this TEnum value) where TEnum : Enum
+    {
+        var memberInfo = typeof(TEnum).GetMember(value.ToString());
+        var descriptionAttribute = memberInfo[0]
+            .GetCustomAttribute<DescriptionAttribute>();
+
+        return descriptionAttribute?.Description ?? value.ToString();
+    }
+}

Core/Application/Common/Extensions/QueryableExtensions.cs

@@ -0,0 +1,20 @@
+using Domain.Common;
+
+namespace Application.Common.Extensions;
+
+
+public static class QueryableExtensions
+{
+    public static IQueryable<T> IsDeletedEqualTo<T>(this IQueryable<T> query, bool isDeleted = false) where T : class
+    {
+        if (typeof(IHasIsDeleted).IsAssignableFrom(typeof(T)))
+        {
+            query = query.Where(x => (x as IHasIsDeleted)!.IsDeleted == isDeleted);
+        }
+
+        return query;
+    }
+
+}
+
+

Core/Application/Common/Repositories/ICommandRepository.cs

@@ -0,0 +1,24 @@
+using Domain.Common;
+
+namespace Application.Common.Repositories;
+
+
+public interface ICommandRepository<T> where T : BaseEntity
+{
+    Task CreateAsync(T entity, CancellationToken cancellationToken = default);
+
+    void Create(T entity);
+
+    void Update(T entity);
+
+    void Delete(T entity);
+
+    void Purge(T entity);
+
+    Task<T?> GetAsync(string id, CancellationToken cancellationToken = default);
+
+    T? Get(string id);
+
+    IQueryable<T> GetQuery();
+}
+

Core/Application/Common/Repositories/IEntityDbSet.cs

@@ -0,0 +1,43 @@
+using Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Common.Repositories;
+
+
+public interface IEntityDbSet
+{
+    public DbSet<Token> Token { get; set; }
+    public DbSet<Todo> Todo { get; set; }
+    public DbSet<TodoItem> TodoItem { get; set; }
+    public DbSet<Company> Company { get; set; }
+    public DbSet<FileImage> FileImage { get; set; }
+    public DbSet<FileDocument> FileDocument { get; set; }
+
+    public DbSet<NumberSequence> NumberSequence { get; set; }
+    public DbSet<CustomerGroup> CustomerGroup { get; set; }
+    public DbSet<CustomerCategory> CustomerCategory { get; set; }
+    public DbSet<VendorGroup> VendorGroup { get; set; }
+    public DbSet<VendorCategory> VendorCategory { get; set; }
+    public DbSet<Customer> Customer { get; set; }
+    public DbSet<Vendor> Vendor { get; set; }
+    public DbSet<UnitMeasure> UnitMeasure { get; set; }
+    public DbSet<ProductGroup> ProductGroup { get; set; }
+    public DbSet<Product> Product { get; set; }
+    public DbSet<CustomerContact> CustomerContact { get; set; }
+    public DbSet<VendorContact> VendorContact { get; set; }
+    public DbSet<Tax> Tax { get; set; }
+    public DbSet<SalesOrder> SalesOrder { get; set; }
+    public DbSet<SalesOrderItem> SalesOrderItem { get; set; }
+    public DbSet<PurchaseOrder> PurchaseOrder { get; set; }
+    public DbSet<PurchaseOrderItem> PurchaseOrderItem { get; set; }
+
+    public DbSet<Campaign> Campaign { get; set; }
+    public DbSet<Budget> Budget { get; set; }
+    public DbSet<Expense> Expense { get; set; }
+    public DbSet<Lead> Lead { get; set; }
+    public DbSet<LeadContact> LeadContact { get; set; }
+    public DbSet<LeadActivity> LeadActivity { get; set; }
+    public DbSet<SalesTeam> SalesTeam { get; set; }
+    public DbSet<SalesRepresentative> SalesRepresentative { get; set; }
+}
+

Core/Application/Common/Repositories/IUnitOfWork.cs

@@ -0,0 +1,7 @@
+namespace Application.Common.Repositories;
+
+public interface IUnitOfWork
+{
+    Task SaveAsync(CancellationToken cancellationToken = default);
+    void Save();
+}

Core/Application/Common/Services/EmailManager/IEmailService.cs

@@ -0,0 +1,7 @@
+namespace Application.Common.Services.EmailManager;
+
+public interface IEmailService
+{
+    Task SendEmailAsync(string email, string subject, string htmlMessage);
+
+}

Core/Application/Common/Services/FileDocumentManager/IFileDocumentService.cs

@@ -0,0 +1,14 @@
+namespace Application.Common.Services.FileDocumentManager;
+public interface IFileDocumentService
+{
+    Task<string> UploadAsync(
+        string? originalFileName,
+        string? docExtension,
+        byte[]? fileData,
+        long? size,
+        string? description = "",
+        string? createdById = "",
+        CancellationToken cancellationToken = default);
+
+    Task<byte[]> GetFileAsync(string fileName, CancellationToken cancellationToken = default);
+}

Core/Application/Common/Services/FileImageManager/IFileImageService.cs

@@ -0,0 +1,13 @@
+namespace Application.Common.Services.FileImageManager;
+public interface IFileImageService
+{
+    Task<string> UploadAsync(
+        string? originalFileName,
+        string? docExtension,
+        byte[]? fileData,
+        long? size,
+        string? description = "",
+        string? createdById = "",
+        CancellationToken cancellationToken = default);
+    Task<byte[]> GetFileAsync(string fileName, CancellationToken cancellationToken = default);
+}

Core/Application/Common/Services/SecurityManager/CreateUserResultDto.cs

@@ -0,0 +1,12 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record CreateUserResultDto
+{
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public bool? EmailConfirmed { get; init; }
+    public bool? IsBlocked { get; init; }
+    public bool? IsDeleted { get; init; }
+}

Core/Application/Common/Services/SecurityManager/DeleteUserResultDto.cs

@@ -0,0 +1,12 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record DeleteUserResultDto
+{
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public bool? EmailConfirmed { get; init; }
+    public bool? IsBlocked { get; init; }
+    public bool? IsDeleted { get; init; }
+}

Core/Application/Common/Services/SecurityManager/GetMyProfileListResultDto.cs

@@ -0,0 +1,9 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record GetMyProfileListResultDto
+{
+    public string? Id { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public string? CompanyName { get; init; }
+}

Core/Application/Common/Services/SecurityManager/GetRoleListResultDto.cs

@@ -0,0 +1,6 @@
+namespace Application.Common.Services.SecurityManager;
+public record GetRoleListResultDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+}

Core/Application/Common/Services/SecurityManager/GetUserListResultDto.cs

@@ -0,0 +1,13 @@
+namespace Application.Common.Services.SecurityManager;
+public record GetUserListResultDto
+{
+    public string? Id { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public string? Email { get; init; }
+    public bool? EmailConfirmed { get; init; }
+    public bool? IsBlocked { get; init; }
+    public bool? IsDeleted { get; init; }
+    public DateTime? CreatedAt { get; init; }
+}
+

Core/Application/Common/Services/SecurityManager/ISecurityService.cs

@@ -0,0 +1,131 @@
+namespace Application.Common.Services.SecurityManager;
+
+public interface ISecurityService
+{
+    public Task<LoginResultDto> LoginAsync(
+        string email,
+        string password,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<LogoutResultDto> LogoutAsync(
+        string userId,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<RegisterResultDto> RegisterAsync(
+        string email,
+        string password,
+        string confirmPassword,
+        string firstName,
+        string lastName,
+        string companyName = "",
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<string> ConfirmEmailAsync(
+        string email,
+        string code,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<string> ForgotPasswordAsync(
+        string email,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<string> ForgotPasswordConfirmationAsync(
+        string email,
+        string tempPassword,
+        string code,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<RefreshTokenResultDto> RefreshTokenAsync(
+        string refreshToken,
+        CancellationToken cancellationToken
+        );
+
+    public Task<List<GetMyProfileListResultDto>> GetMyProfileListAsync(
+        string userId,
+        CancellationToken cancellationToken
+        );
+
+    public Task UpdateMyProfileAsync(
+        string userId,
+        string firstName,
+        string lastName,
+        string companyName,
+        CancellationToken cancellationToken
+        );
+
+    public Task ChangePasswordAsync(
+        string userId,
+        string oldPassword,
+        string newPassword,
+        string confirmNewPassword,
+        CancellationToken cancellationToken
+        );
+
+    public Task<List<GetRoleListResultDto>> GetRoleListAsync(
+        CancellationToken cancellationToken
+        );
+
+    public Task<List<GetUserListResultDto>> GetUserListAsync(
+        CancellationToken cancellationToken
+        );
+
+    public Task<CreateUserResultDto> CreateUserAsync(
+        string email,
+        string password,
+        string confirmPassword,
+        string firstName,
+        string lastName,
+        bool emailConfirmed = true,
+        bool isBlocked = false,
+        bool isDeleted = false,
+        string createdById = "",
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<UpdateUserResultDto> UpdateUserAsync(
+        string userId,
+        string firstName,
+        string lastName,
+        bool emailConfirmed = true,
+        bool isBlocked = false,
+        bool isDeleted = false,
+        string updatedById = "",
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<DeleteUserResultDto> DeleteUserAsync(
+        string userId,
+        string deletedById = "",
+        CancellationToken cancellationToken = default
+        );
+
+    public Task UpdatePasswordUserAsync(
+        string userId,
+        string newPassword,
+        CancellationToken cancellationToken
+        );
+
+    public Task<List<string>> GetUserRolesAsync(
+        string userId,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task<List<string>> UpdateUserRoleAsync(
+        string userId,
+        string roleName,
+        bool accessGranted,
+        CancellationToken cancellationToken = default
+        );
+
+    public Task ChangeAvatarAsync(
+        string userId,
+        string avatar,
+        CancellationToken cancellationToken
+        );
+}

Core/Application/Common/Services/SecurityManager/LoginResultDto.cs

@@ -0,0 +1,15 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record LoginResultDto
+{
+    public string? AccessToken { get; init; }
+    public string? RefreshToken { get; init; }
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public string? CompanyName { get; init; }
+    public string? Avatar { get; init; }
+    public List<MenuNavigationTreeNodeDto>? MenuNavigation { get; init; }
+    public List<string>? Roles { get; init; }
+}

Core/Application/Common/Services/SecurityManager/LogoutResultDto.cs

@@ -0,0 +1,13 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record LogoutResultDto
+{
+    public string? AccessToken { get; init; }
+    public string? RefreshToken { get; init; }
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public string? CompanyName { get; init; }
+    public List<string>? UserClaims { get; init; }
+}

Core/Application/Common/Services/SecurityManager/MenuNavigationTreeNodeDto.cs

@@ -0,0 +1,23 @@
+namespace Application.Common.Services.SecurityManager;
+
+public class MenuNavigationTreeNodeDto
+{
+    public string Id { get; set; }
+    public string Name { get; set; }
+    public string? Pid { get; set; }
+    public string? NavURL { get; set; }
+    public bool HasChild { get; set; }
+    public bool Expanded { get; set; }
+    public bool IsSelected { get; set; }
+
+    public MenuNavigationTreeNodeDto(string param_id, string param_name, string? param_pid = null, string? param_navURL = null, bool param_hasChild = false, bool param_expanded = false, bool param_selected = false)
+    {
+        Id = param_id;
+        Name = param_name;
+        Pid = param_pid;
+        NavURL = param_navURL;
+        HasChild = param_hasChild;
+        Expanded = param_expanded;
+        IsSelected = param_selected;
+    }
+}

Core/Application/Common/Services/SecurityManager/RefreshTokenResultDto.cs

@@ -0,0 +1,15 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record RefreshTokenResultDto
+{
+    public string? AccessToken { get; init; }
+    public string? RefreshToken { get; init; }
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public string? CompanyName { get; init; }
+    public string? Avatar { get; init; }
+    public List<MenuNavigationTreeNodeDto>? MenuNavigation { get; init; }
+    public List<string>? Roles { get; init; }
+}

Core/Application/Common/Services/SecurityManager/RegisterResultDto.cs

@@ -0,0 +1,10 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record RegisterResultDto
+{
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public string? CompanyName { get; init; }
+}

Core/Application/Common/Services/SecurityManager/UpdateUserResultDto.cs

@@ -0,0 +1,12 @@
+namespace Application.Common.Services.SecurityManager;
+
+public record UpdateUserResultDto
+{
+    public string? UserId { get; init; }
+    public string? Email { get; init; }
+    public string? FirstName { get; init; }
+    public string? LastName { get; init; }
+    public bool? EmailConfirmed { get; init; }
+    public bool? IsBlocked { get; init; }
+    public bool? IsDeleted { get; init; }
+}

Core/Application/DependencyInjection.cs

@@ -0,0 +1,49 @@
+using Application.Common.Behaviors;
+using FluentValidation;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using System.Reflection;
+
+namespace Application;
+
+public static class DependencyInjection
+{
+    public static IServiceCollection AddApplicationServices(this IServiceCollection services)
+    {
+        //>>> AutoMapper
+        services.AddAutoMapper(Assembly.GetExecutingAssembly());
+
+        //>>> FluentValidation
+        services.AddValidatorsFromAssembly(Assembly.GetExecutingAssembly());
+
+        //>>> MediatR
+        services.AddMediatR(x =>
+        {
+            x.RegisterServicesFromAssembly(Assembly.GetExecutingAssembly());
+            x.AddBehavior(typeof(IPipelineBehavior<,>), typeof(LoggingBehaviour<,>));
+            x.AddBehavior(typeof(IPipelineBehavior<,>), typeof(ValidationBehaviour<,>));
+        });
+
+        //>>> Register services in Application.Features 
+        var assembly = Assembly.GetExecutingAssembly();
+        var featureTypes = assembly.GetTypes()
+            .Where(type => type.IsClass && !type.IsAbstract)
+            .Where(type => type.Namespace != null && type.Namespace.StartsWith("Application.Features"));
+
+        foreach (var type in featureTypes)
+        {
+            var interfaces = type.GetInterfaces();
+            foreach (var serviceInterface in interfaces)
+            {
+                services.AddScoped(serviceInterface, type);
+            }
+            if (!interfaces.Any())
+            {
+                services.AddScoped(type);
+            }
+        }
+
+        return services;
+    }
+}
+

Core/Application/Features/BudgetManager/Commands/CreateBudget.cs

@@ -0,0 +1,77 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.BudgetManager.Commands;
+
+public class CreateBudgetResult
+{
+    public Budget? Data { get; set; }
+}
+
+public class CreateBudgetRequest : IRequest<CreateBudgetResult>
+{
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? BudgetDate { get; init; }
+    public string? Status { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateBudgetValidator : AbstractValidator<CreateBudgetRequest>
+{
+    public CreateBudgetValidator()
+    {
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.BudgetDate).NotNull();
+        RuleFor(x => x.Amount).NotNull();
+        RuleFor(x => x.CampaignId).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+    }
+}
+
+public class CreateBudgetHandler : IRequestHandler<CreateBudgetRequest, CreateBudgetResult>
+{
+    private readonly ICommandRepository<Budget> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateBudgetHandler(
+        ICommandRepository<Budget> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateBudgetResult> Handle(CreateBudgetRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new Budget
+        {
+            CreatedById = request.CreatedById,
+            Number = _numberSequenceService.GenerateNumber(nameof(Budget), "", "BUD"),
+            Title = request.Title,
+            Description = request.Description,
+            BudgetDate = request.BudgetDate,
+            Status = (BudgetStatus)int.Parse(request.Status!),
+            Amount = request.Amount,
+            CampaignId = request.CampaignId
+        };
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateBudgetResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/BudgetManager/Commands/DeleteBudget.cs

@@ -0,0 +1,60 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.BudgetManager.Commands;
+
+public class DeleteBudgetResult
+{
+    public Budget? Data { get; set; }
+}
+
+public class DeleteBudgetRequest : IRequest<DeleteBudgetResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteBudgetValidator : AbstractValidator<DeleteBudgetRequest>
+{
+    public DeleteBudgetValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteBudgetHandler : IRequestHandler<DeleteBudgetRequest, DeleteBudgetResult>
+{
+    private readonly ICommandRepository<Budget> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteBudgetHandler(
+        ICommandRepository<Budget> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteBudgetResult> Handle(DeleteBudgetRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteBudgetResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/BudgetManager/Commands/UpdateBudget.cs

@@ -0,0 +1,78 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.BudgetManager.Commands;
+
+public class UpdateBudgetResult
+{
+    public Budget? Data { get; set; }
+}
+
+public class UpdateBudgetRequest : IRequest<UpdateBudgetResult>
+{
+    public string? Id { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? BudgetDate { get; init; }
+    public string? Status { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateBudgetValidator : AbstractValidator<UpdateBudgetRequest>
+{
+    public UpdateBudgetValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.BudgetDate).NotNull();
+        RuleFor(x => x.Amount).NotNull();
+        RuleFor(x => x.CampaignId).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+    }
+}
+
+public class UpdateBudgetHandler : IRequestHandler<UpdateBudgetRequest, UpdateBudgetResult>
+{
+    private readonly ICommandRepository<Budget> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateBudgetHandler(
+        ICommandRepository<Budget> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateBudgetResult> Handle(UpdateBudgetRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+        entity.Title = request.Title;
+        entity.Description = request.Description;
+        entity.BudgetDate = request.BudgetDate;
+        entity.Status = (BudgetStatus)int.Parse(request.Status!);
+        entity.Amount = request.Amount;
+        entity.CampaignId = request.CampaignId;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateBudgetResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/BudgetManager/Queries/GetBudgetByCampaignIdList.cs

@@ -0,0 +1,82 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.BudgetManager.Queries;
+
+public record GetBudgetByCampaignIdListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? BudgetDate { get; init; }
+    public BudgetStatus? Status { get; init; }
+    public string? StatusName { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? CampaignName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetBudgetByCampaignIdListProfile : Profile
+{
+    public GetBudgetByCampaignIdListProfile()
+    {
+        CreateMap<Budget, GetBudgetByCampaignIdListDto>()
+            .ForMember(
+                dest => dest.CampaignName,
+                opt => opt.MapFrom(src => src.Campaign != null ? src.Campaign.Title : string.Empty)
+            )
+            .ForMember(
+                dest => dest.StatusName,
+                opt => opt.MapFrom(src => src.Status.HasValue ? src.Status.Value.ToFriendlyName() : string.Empty)
+            );
+    }
+}
+
+public class GetBudgetByCampaignIdListResult
+{
+    public List<GetBudgetByCampaignIdListDto>? Data { get; init; }
+}
+
+public class GetBudgetByCampaignIdListRequest : IRequest<GetBudgetByCampaignIdListResult>
+{
+    public string? CampaignId { get; init; }
+}
+
+public class GetBudgetByCampaignIdListHandler : IRequestHandler<GetBudgetByCampaignIdListRequest, GetBudgetByCampaignIdListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetBudgetByCampaignIdListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetBudgetByCampaignIdListResult> Handle(GetBudgetByCampaignIdListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Budget
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.Campaign)
+            .Where(x => x.CampaignId == request.CampaignId)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetBudgetByCampaignIdListDto>>(entities);
+
+        return new GetBudgetByCampaignIdListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/BudgetManager/Queries/GetBudgetList.cs

@@ -0,0 +1,81 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.BudgetManager.Queries;
+
+public record GetBudgetListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? BudgetDate { get; init; }
+    public BudgetStatus? Status { get; init; }
+    public string? StatusName { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? CampaignName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetBudgetListProfile : Profile
+{
+    public GetBudgetListProfile()
+    {
+        CreateMap<Budget, GetBudgetListDto>()
+            .ForMember(
+                dest => dest.CampaignName,
+                opt => opt.MapFrom(src => src.Campaign != null ? src.Campaign.Title : string.Empty)
+            )
+            .ForMember(
+                dest => dest.StatusName,
+                opt => opt.MapFrom(src => src.Status.HasValue ? src.Status.Value.ToFriendlyName() : string.Empty)
+            );
+    }
+}
+
+public class GetBudgetListResult
+{
+    public List<GetBudgetListDto>? Data { get; init; }
+}
+
+public class GetBudgetListRequest : IRequest<GetBudgetListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+public class GetBudgetListHandler : IRequestHandler<GetBudgetListRequest, GetBudgetListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetBudgetListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetBudgetListResult> Handle(GetBudgetListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Budget
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .Include(x => x.Campaign)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetBudgetListDto>>(entities);
+
+        return new GetBudgetListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/BudgetManager/Queries/GetBudgetSingle.cs

@@ -0,0 +1,62 @@
+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.BudgetManager.Queries;
+
+public class GetBudgetSingleProfile : Profile
+{
+    public GetBudgetSingleProfile()
+    {
+    }
+}
+
+public class GetBudgetSingleResult
+{
+    public Budget? Data { get; init; }
+}
+
+public class GetBudgetSingleRequest : IRequest<GetBudgetSingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetBudgetSingleValidator : AbstractValidator<GetBudgetSingleRequest>
+{
+    public GetBudgetSingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetBudgetSingleHandler : IRequestHandler<GetBudgetSingleRequest, GetBudgetSingleResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetBudgetSingleHandler(
+        IQueryContext context
+        )
+    {
+        _context = context;
+    }
+
+    public async Task<GetBudgetSingleResult> Handle(GetBudgetSingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Budget
+            .AsNoTracking()
+            .Include(x => x.Campaign)
+            .Where(x => x.Id == request.Id)
+            .AsQueryable();
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        return new GetBudgetSingleResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/BudgetManager/Queries/GetBudgetStatus.cs

@@ -0,0 +1,55 @@
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Enums;
+using MediatR;
+
+namespace Application.Features.BudgetManager.Queries;
+
+public record GetBudgetStatusListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+}
+
+public class GetBudgetStatusListProfile : Profile
+{
+    public GetBudgetStatusListProfile()
+    {
+    }
+}
+
+public class GetBudgetStatusListResult
+{
+    public List<GetBudgetStatusListDto>? Data { get; init; }
+}
+
+public class GetBudgetStatusListRequest : IRequest<GetBudgetStatusListResult>
+{
+}
+
+public class GetBudgetStatusListHandler : IRequestHandler<GetBudgetStatusListRequest, GetBudgetStatusListResult>
+{
+
+    public GetBudgetStatusListHandler()
+    {
+    }
+
+    public async Task<GetBudgetStatusListResult> Handle(GetBudgetStatusListRequest request, CancellationToken cancellationToken)
+    {
+        var statuses = Enum.GetValues(typeof(BudgetStatus))
+            .Cast<BudgetStatus>()
+            .Select(status => new GetBudgetStatusListDto
+            {
+                Id = ((int)status).ToString(),
+                Name = status.ToFriendlyName()
+            })
+            .ToList();
+
+        await Task.CompletedTask;
+
+        return new GetBudgetStatusListResult
+        {
+            Data = statuses
+        };
+    }
+}

Core/Application/Features/CampaignManager/Commands/CreateCampaign.cs

@@ -0,0 +1,79 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CampaignManager.Commands;
+
+public class CreateCampaignResult
+{
+    public Campaign? Data { get; set; }
+}
+
+public class CreateCampaignRequest : IRequest<CreateCampaignResult>
+{
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public double? TargetRevenueAmount { get; init; }
+    public DateTime? CampaignDateStart { get; init; }
+    public DateTime? CampaignDateFinish { get; init; }
+    public string? SalesTeamId { get; init; }
+    public string? Status { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateCampaignValidator : AbstractValidator<CreateCampaignRequest>
+{
+    public CreateCampaignValidator()
+    {
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.SalesTeamId).NotEmpty();
+        RuleFor(x => x.CampaignDateStart).NotEmpty();
+        RuleFor(x => x.CampaignDateFinish).NotEmpty();
+        RuleFor(x => x.TargetRevenueAmount).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+    }
+}
+
+public class CreateCampaignHandler : IRequestHandler<CreateCampaignRequest, CreateCampaignResult>
+{
+    private readonly ICommandRepository<Campaign> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateCampaignHandler(
+        ICommandRepository<Campaign> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateCampaignResult> Handle(CreateCampaignRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new Campaign();
+        entity.CreatedById = request.CreatedById;
+
+        entity.Number = _numberSequenceService.GenerateNumber(nameof(Campaign), "", "CAM");
+        entity.Title = request.Title;
+        entity.SalesTeamId = request.SalesTeamId;
+        entity.Description = request.Description;
+        entity.TargetRevenueAmount = request.TargetRevenueAmount;
+        entity.CampaignDateStart = request.CampaignDateStart;
+        entity.CampaignDateFinish = request.CampaignDateFinish;
+        entity.Status = (CampaignStatus)int.Parse(request.Status!);
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateCampaignResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CampaignManager/Commands/DeleteCampaign.cs

@@ -0,0 +1,60 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CampaignManager.Commands;
+
+public class DeleteCampaignResult
+{
+    public Campaign? Data { get; set; }
+}
+
+public class DeleteCampaignRequest : IRequest<DeleteCampaignResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteCampaignValidator : AbstractValidator<DeleteCampaignRequest>
+{
+    public DeleteCampaignValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteCampaignHandler : IRequestHandler<DeleteCampaignRequest, DeleteCampaignResult>
+{
+    private readonly ICommandRepository<Campaign> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteCampaignHandler(
+        ICommandRepository<Campaign> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteCampaignResult> Handle(DeleteCampaignRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteCampaignResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CampaignManager/Commands/UpdateCampaign.cs

@@ -0,0 +1,82 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CampaignManager.Commands;
+
+public class UpdateCampaignResult
+{
+    public Campaign? Data { get; set; }
+}
+
+public class UpdateCampaignRequest : IRequest<UpdateCampaignResult>
+{
+    public string? Id { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public double? TargetRevenueAmount { get; init; }
+    public DateTime? CampaignDateStart { get; init; }
+    public DateTime? CampaignDateFinish { get; init; }
+    public string? SalesTeamId { get; init; }
+    public string? Status { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateCampaignValidator : AbstractValidator<UpdateCampaignRequest>
+{
+    public UpdateCampaignValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.SalesTeamId).NotEmpty();
+        RuleFor(x => x.CampaignDateStart).NotEmpty();
+        RuleFor(x => x.CampaignDateFinish).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+    }
+}
+
+public class UpdateCampaignHandler : IRequestHandler<UpdateCampaignRequest, UpdateCampaignResult>
+{
+    private readonly ICommandRepository<Campaign> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateCampaignHandler(
+        ICommandRepository<Campaign> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateCampaignResult> Handle(UpdateCampaignRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+
+        entity.Title = request.Title;
+        entity.SalesTeamId = request.SalesTeamId;
+        entity.Description = request.Description;
+        entity.TargetRevenueAmount = request.TargetRevenueAmount;
+        entity.CampaignDateStart = request.CampaignDateStart;
+        entity.CampaignDateFinish = request.CampaignDateFinish;
+        entity.Status = (CampaignStatus)int.Parse(request.Status!);
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateCampaignResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CampaignManager/Queries/GetCampaignList.cs

@@ -0,0 +1,82 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CampaignManager.Queries;
+
+public record GetCampaignListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public double? TargetRevenueAmount { get; init; }
+    public DateTime? CampaignDateStart { get; init; }
+    public DateTime? CampaignDateFinish { get; init; }
+    public CampaignStatus? Status { get; init; }
+    public string? StatusName { get; init; }
+    public string? SalesTeamId { get; init; }
+    public string? SalesTeamName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCampaignListProfile : Profile
+{
+    public GetCampaignListProfile()
+    {
+        CreateMap<Campaign, GetCampaignListDto>()
+            .ForMember(
+                dest => dest.StatusName,
+                opt => opt.MapFrom(src => src.Status.HasValue ? src.Status.Value.ToFriendlyName() : string.Empty)
+            )
+            .ForMember(
+                dest => dest.SalesTeamName,
+                opt => opt.MapFrom(src => src.SalesTeam != null ? src.SalesTeam.Name : string.Empty)
+            );
+    }
+}
+
+public class GetCampaignListResult
+{
+    public List<GetCampaignListDto>? Data { get; init; }
+}
+
+public class GetCampaignListRequest : IRequest<GetCampaignListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+public class GetCampaignListHandler : IRequestHandler<GetCampaignListRequest, GetCampaignListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCampaignListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCampaignListResult> Handle(GetCampaignListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Campaign
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .Include(x => x.SalesTeam)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCampaignListDto>>(entities);
+
+        return new GetCampaignListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/CampaignManager/Queries/GetCampaignSingle.cs

@@ -0,0 +1,64 @@
+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CampaignManager.Queries;
+
+public class GetCampaignSingleProfile : Profile
+{
+    public GetCampaignSingleProfile()
+    {
+    }
+}
+
+public class GetCampaignSingleResult
+{
+    public Campaign? Data { get; init; }
+}
+
+public class GetCampaignSingleRequest : IRequest<GetCampaignSingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetCampaignSingleValidator : AbstractValidator<GetCampaignSingleRequest>
+{
+    public GetCampaignSingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetCampaignSingleHandler : IRequestHandler<GetCampaignSingleRequest, GetCampaignSingleResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetCampaignSingleHandler(
+        IQueryContext context
+        )
+    {
+        _context = context;
+    }
+
+    public async Task<GetCampaignSingleResult> Handle(GetCampaignSingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Campaign
+            .AsNoTracking()
+            .Include(x => x.CampaignBudgetList.Where(budget => !budget.IsDeleted))
+            .Include(x => x.CampaignExpenseList.Where(expense => !expense.IsDeleted))
+            .Include(x => x.CampaignLeadList.Where(lead => !lead.IsDeleted))
+            .Where(x => x.Id == request.Id)
+            .AsQueryable();
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        return new GetCampaignSingleResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CampaignManager/Queries/GetCampaignStatusList.cs

@@ -0,0 +1,54 @@
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Enums;
+using MediatR;
+
+namespace Application.Features.CampaignManager.Queries;
+
+public record GetCampaignStatusListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+}
+
+public class GetCampaignStatusListProfile : Profile
+{
+    public GetCampaignStatusListProfile()
+    {
+    }
+}
+
+public class GetCampaignStatusListResult
+{
+    public List<GetCampaignStatusListDto>? Data { get; init; }
+}
+
+public class GetCampaignStatusListRequest : IRequest<GetCampaignStatusListResult>
+{
+}
+
+public class GetCampaignStatusListHandler : IRequestHandler<GetCampaignStatusListRequest, GetCampaignStatusListResult>
+{
+    public GetCampaignStatusListHandler()
+    {
+    }
+
+    public async Task<GetCampaignStatusListResult> Handle(GetCampaignStatusListRequest request, CancellationToken cancellationToken)
+    {
+        var statuses = Enum.GetValues(typeof(CampaignStatus))
+            .Cast<CampaignStatus>()
+            .Select(status => new GetCampaignStatusListDto
+            {
+                Id = ((int)status).ToString(),
+                Name = status.ToFriendlyName()
+            })
+            .ToList();
+
+        await Task.CompletedTask;
+
+        return new GetCampaignStatusListResult
+        {
+            Data = statuses
+        };
+    }
+}

Core/Application/Features/CompanyManager/Commands/UpdateCompany.cs

@@ -0,0 +1,95 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CompanyManager.Commands;
+
+public class UpdateCompanyResult
+{
+    public Company? Data { get; set; }
+}
+
+public class UpdateCompanyRequest : IRequest<UpdateCompanyResult>
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? Currency { get; init; }
+    public string? Street { get; init; }
+    public string? City { get; init; }
+    public string? State { get; init; }
+    public string? ZipCode { get; init; }
+    public string? Country { get; init; }
+    public string? PhoneNumber { get; init; }
+    public string? FaxNumber { get; init; }
+    public string? EmailAddress { get; init; }
+    public string? Website { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateCompanyValidator : AbstractValidator<UpdateCompanyRequest>
+{
+    public UpdateCompanyValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.Currency).NotEmpty();
+        RuleFor(x => x.Street).NotEmpty();
+        RuleFor(x => x.City).NotEmpty();
+        RuleFor(x => x.State).NotEmpty();
+        RuleFor(x => x.ZipCode).NotEmpty();
+        RuleFor(x => x.PhoneNumber).NotEmpty();
+        RuleFor(x => x.EmailAddress).NotEmpty();
+    }
+}
+
+public class UpdateCompanyHandler : IRequestHandler<UpdateCompanyRequest, UpdateCompanyResult>
+{
+    private readonly ICommandRepository<Company> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateCompanyHandler(
+        ICommandRepository<Company> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateCompanyResult> Handle(UpdateCompanyRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+
+        entity.Name = request.Name;
+        entity.Description = request.Description;
+        entity.Currency = request.Currency;
+        entity.Street = request.Street;
+        entity.City = request.City;
+        entity.State = request.State;
+        entity.ZipCode = request.ZipCode;
+        entity.Country = request.Country;
+        entity.PhoneNumber = request.PhoneNumber;
+        entity.FaxNumber = request.FaxNumber;
+        entity.EmailAddress = request.EmailAddress;
+        entity.Website = request.Website;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateCompanyResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CompanyManager/Queries/GetCompanyList.cs

@@ -0,0 +1,80 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CompanyManager.Queries;
+
+public record GetCompanyListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? Currency { get; init; }
+    public string? Street { get; init; }
+    public string? City { get; init; }
+    public string? State { get; init; }
+    public string? ZipCode { get; init; }
+    public string? Country { get; init; }
+    public string? PhoneNumber { get; init; }
+    public string? FaxNumber { get; init; }
+    public string? EmailAddress { get; init; }
+    public string? Website { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCompanyListProfile : Profile
+{
+    public GetCompanyListProfile()
+    {
+        CreateMap<Company, GetCompanyListDto>();
+    }
+}
+
+public class GetCompanyListResult
+{
+    public List<GetCompanyListDto>? Data { get; init; }
+}
+
+public class GetCompanyListRequest : IRequest<GetCompanyListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+
+public class GetCompanyListHandler : IRequestHandler<GetCompanyListRequest, GetCompanyListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCompanyListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCompanyListResult> Handle(GetCompanyListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Company
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCompanyListDto>>(entities);
+
+        return new GetCompanyListResult
+        {
+            Data = dtos
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/CompanyManager/Queries/GetCompanySingle.cs

@@ -0,0 +1,86 @@
+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CompanyManager.Queries;
+
+public record GetCompanySingleDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? Currency { get; init; }
+    public string? Street { get; init; }
+    public string? City { get; init; }
+    public string? State { get; init; }
+    public string? ZipCode { get; init; }
+    public string? Country { get; init; }
+    public string? PhoneNumber { get; init; }
+    public string? FaxNumber { get; init; }
+    public string? EmailAddress { get; init; }
+    public string? Website { get; init; }
+}
+
+public class GetCompanySingleProfile : Profile
+{
+    public GetCompanySingleProfile()
+    {
+        CreateMap<Company, GetCompanySingleDto>();
+    }
+}
+
+public class GetCompanySingleResult
+{
+    public GetCompanySingleDto? Data { get; init; }
+}
+
+public class GetCompanySingleRequest : IRequest<GetCompanySingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetCompanySingleValidator : AbstractValidator<GetCompanySingleRequest>
+{
+    public GetCompanySingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetCompanySingleHandler : IRequestHandler<GetCompanySingleRequest, GetCompanySingleResult>
+{
+    private readonly IQueryContext _context;
+    private readonly IMapper _mapper;
+
+    public GetCompanySingleHandler(
+        IQueryContext context,
+        IMapper mapper
+        )
+    {
+        _context = context;
+        _mapper = mapper;
+    }
+
+    public async Task<GetCompanySingleResult> Handle(GetCompanySingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Company
+            .AsNoTracking()
+            .AsQueryable();
+
+        query = query
+            .Where(x => x.Id == request.Id);
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        var dto = _mapper.Map<GetCompanySingleDto>(entity);
+
+        return new GetCompanySingleResult
+        {
+            Data = dto
+        };
+    }
+}

Core/Application/Features/CustomerCategoryManager/Commands/CreateCustomerCategory.cs

@@ -0,0 +1,58 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerCategoryManager.Commands;
+
+public class CreateCustomerCategoryResult
+{
+    public CustomerCategory? Data { get; set; }
+}
+
+public class CreateCustomerCategoryRequest : IRequest<CreateCustomerCategoryResult>
+{
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateCustomerCategoryValidator : AbstractValidator<CreateCustomerCategoryRequest>
+{
+    public CreateCustomerCategoryValidator()
+    {
+        RuleFor(x => x.Name).NotEmpty();
+    }
+}
+
+public class CreateCustomerCategoryHandler : IRequestHandler<CreateCustomerCategoryRequest, CreateCustomerCategoryResult>
+{
+    private readonly ICommandRepository<CustomerCategory> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public CreateCustomerCategoryHandler(
+        ICommandRepository<CustomerCategory> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<CreateCustomerCategoryResult> Handle(CreateCustomerCategoryRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new CustomerCategory();
+        entity.CreatedById = request.CreatedById;
+
+        entity.Name = request.Name;
+        entity.Description = request.Description;
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateCustomerCategoryResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CustomerCategoryManager/Commands/DeleteCustomerCategory.cs

@@ -0,0 +1,62 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerCategoryManager.Commands;
+
+public class DeleteCustomerCategoryResult
+{
+    public CustomerCategory? Data { get; set; }
+}
+
+public class DeleteCustomerCategoryRequest : IRequest<DeleteCustomerCategoryResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteCustomerCategoryValidator : AbstractValidator<DeleteCustomerCategoryRequest>
+{
+    public DeleteCustomerCategoryValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteCustomerCategoryHandler : IRequestHandler<DeleteCustomerCategoryRequest, DeleteCustomerCategoryResult>
+{
+    private readonly ICommandRepository<CustomerCategory> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteCustomerCategoryHandler(
+        ICommandRepository<CustomerCategory> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteCustomerCategoryResult> Handle(DeleteCustomerCategoryRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteCustomerCategoryResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerCategoryManager/Commands/UpdateCustomerCategory.cs

@@ -0,0 +1,68 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerCategoryManager.Commands;
+
+public class UpdateCustomerCategoryResult
+{
+    public CustomerCategory? Data { get; set; }
+}
+
+public class UpdateCustomerCategoryRequest : IRequest<UpdateCustomerCategoryResult>
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateCustomerCategoryValidator : AbstractValidator<UpdateCustomerCategoryRequest>
+{
+    public UpdateCustomerCategoryValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Name).NotEmpty();
+    }
+}
+
+public class UpdateCustomerCategoryHandler : IRequestHandler<UpdateCustomerCategoryRequest, UpdateCustomerCategoryResult>
+{
+    private readonly ICommandRepository<CustomerCategory> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateCustomerCategoryHandler(
+        ICommandRepository<CustomerCategory> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateCustomerCategoryResult> Handle(UpdateCustomerCategoryRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+
+        entity.Name = request.Name;
+        entity.Description = request.Description;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateCustomerCategoryResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerCategoryManager/Queries/GetCustomerCategoryList.cs

@@ -0,0 +1,70 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CustomerCategoryManager.Queries;
+
+public record GetCustomerCategoryListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCustomerCategoryListProfile : Profile
+{
+    public GetCustomerCategoryListProfile()
+    {
+        CreateMap<CustomerCategory, GetCustomerCategoryListDto>();
+    }
+}
+
+public class GetCustomerCategoryListResult
+{
+    public List<GetCustomerCategoryListDto>? Data { get; init; }
+}
+
+public class GetCustomerCategoryListRequest : IRequest<GetCustomerCategoryListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+
+public class GetCustomerCategoryListHandler : IRequestHandler<GetCustomerCategoryListRequest, GetCustomerCategoryListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCustomerCategoryListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCustomerCategoryListResult> Handle(GetCustomerCategoryListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .CustomerCategory
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCustomerCategoryListDto>>(entities);
+
+        return new GetCustomerCategoryListResult
+        {
+            Data = dtos
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/CustomerContactManager/Commands/CreateCustomerContact.cs

@@ -0,0 +1,74 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerContactManager.Commands;
+
+public class CreateCustomerContactResult
+{
+    public CustomerContact? Data { get; set; }
+}
+
+public class CreateCustomerContactRequest : IRequest<CreateCustomerContactResult>
+{
+    public string? Name { get; init; }
+    public string? JobTitle { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Description { get; set; }
+    public string? CustomerId { get; set; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateCustomerContactValidator : AbstractValidator<CreateCustomerContactRequest>
+{
+    public CreateCustomerContactValidator()
+    {
+        RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.JobTitle).NotEmpty();
+        RuleFor(x => x.PhoneNumber).NotEmpty();
+        RuleFor(x => x.EmailAddress).NotEmpty();
+    }
+}
+
+public class CreateCustomerContactHandler : IRequestHandler<CreateCustomerContactRequest, CreateCustomerContactResult>
+{
+    private readonly ICommandRepository<CustomerContact> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateCustomerContactHandler(
+        ICommandRepository<CustomerContact> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateCustomerContactResult> Handle(CreateCustomerContactRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new CustomerContact();
+        entity.CreatedById = request.CreatedById;
+
+        entity.Name = request.Name;
+        entity.Number = _numberSequenceService.GenerateNumber(nameof(CustomerContact), "", "CC");
+        entity.JobTitle = request.JobTitle;
+        entity.PhoneNumber = request.PhoneNumber;
+        entity.EmailAddress = request.EmailAddress;
+        entity.Description = request.Description;
+        entity.CustomerId = request.CustomerId;
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateCustomerContactResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CustomerContactManager/Commands/DeleteCustomerContact.cs

@@ -0,0 +1,62 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerContactManager.Commands;
+
+public class DeleteCustomerContactResult
+{
+    public CustomerContact? Data { get; set; }
+}
+
+public class DeleteCustomerContactRequest : IRequest<DeleteCustomerContactResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteCustomerContactValidator : AbstractValidator<DeleteCustomerContactRequest>
+{
+    public DeleteCustomerContactValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteCustomerContactHandler : IRequestHandler<DeleteCustomerContactRequest, DeleteCustomerContactResult>
+{
+    private readonly ICommandRepository<CustomerContact> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteCustomerContactHandler(
+        ICommandRepository<CustomerContact> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteCustomerContactResult> Handle(DeleteCustomerContactRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteCustomerContactResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerContactManager/Commands/UpdateCustomerContact.cs

@@ -0,0 +1,79 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerContactManager.Commands;
+
+public class UpdateCustomerContactResult
+{
+    public CustomerContact? Data { get; set; }
+}
+
+public class UpdateCustomerContactRequest : IRequest<UpdateCustomerContactResult>
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? JobTitle { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Description { get; set; }
+    public string? CustomerId { get; set; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateCustomerContactValidator : AbstractValidator<UpdateCustomerContactRequest>
+{
+    public UpdateCustomerContactValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.JobTitle).NotEmpty();
+        RuleFor(x => x.PhoneNumber).NotEmpty();
+        RuleFor(x => x.EmailAddress).NotEmpty();
+    }
+}
+
+public class UpdateCustomerContactHandler : IRequestHandler<UpdateCustomerContactRequest, UpdateCustomerContactResult>
+{
+    private readonly ICommandRepository<CustomerContact> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateCustomerContactHandler(
+        ICommandRepository<CustomerContact> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateCustomerContactResult> Handle(UpdateCustomerContactRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+
+        entity.Name = request.Name;
+        entity.JobTitle = request.JobTitle;
+        entity.PhoneNumber = request.PhoneNumber;
+        entity.EmailAddress = request.EmailAddress;
+        entity.Description = request.Description;
+        entity.CustomerId = request.CustomerId;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateCustomerContactResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerContactManager/Queries/GetCustomerContactByCustomerIdList.cs

@@ -0,0 +1,83 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CustomerContactManager.Queries;
+
+public record GetCustomerContactByCustomerIdListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; set; }
+    public string? Number { get; set; }
+    public string? JobTitle { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Description { get; set; }
+    public string? CustomerId { get; set; }
+    public string? CustomerName { get; set; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCustomerContactByCustomerIdListProfile : Profile
+{
+    public GetCustomerContactByCustomerIdListProfile()
+    {
+        CreateMap<CustomerContact, GetCustomerContactByCustomerIdListDto>()
+            .ForMember(
+                dest => dest.CustomerName,
+                opt => opt.MapFrom(src => src.Customer != null ? src.Customer.Name : string.Empty)
+            );
+
+    }
+}
+
+public class GetCustomerContactByCustomerIdListResult
+{
+    public List<GetCustomerContactByCustomerIdListDto>? Data { get; init; }
+}
+
+public class GetCustomerContactByCustomerIdListRequest : IRequest<GetCustomerContactByCustomerIdListResult>
+{
+    public string? CustomerId { get; init; }
+}
+
+
+public class GetCustomerContactByCustomerIdListHandler : IRequestHandler<GetCustomerContactByCustomerIdListRequest, GetCustomerContactByCustomerIdListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCustomerContactByCustomerIdListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCustomerContactByCustomerIdListResult> Handle(GetCustomerContactByCustomerIdListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .CustomerContact
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.Customer)
+            .Where(x => x.CustomerId == request.CustomerId)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCustomerContactByCustomerIdListDto>>(entities);
+
+        return new GetCustomerContactByCustomerIdListResult
+        {
+            Data = dtos
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/CustomerContactManager/Queries/GetCustomerContactList.cs

@@ -0,0 +1,82 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CustomerContactManager.Queries;
+
+public record GetCustomerContactListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; set; }
+    public string? Number { get; set; }
+    public string? JobTitle { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Description { get; set; }
+    public string? CustomerId { get; set; }
+    public string? CustomerName { get; set; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCustomerContactListProfile : Profile
+{
+    public GetCustomerContactListProfile()
+    {
+        CreateMap<CustomerContact, GetCustomerContactListDto>()
+            .ForMember(
+                dest => dest.CustomerName,
+                opt => opt.MapFrom(src => src.Customer != null ? src.Customer.Name : string.Empty)
+            );
+
+    }
+}
+
+public class GetCustomerContactListResult
+{
+    public List<GetCustomerContactListDto>? Data { get; init; }
+}
+
+public class GetCustomerContactListRequest : IRequest<GetCustomerContactListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+
+public class GetCustomerContactListHandler : IRequestHandler<GetCustomerContactListRequest, GetCustomerContactListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCustomerContactListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCustomerContactListResult> Handle(GetCustomerContactListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .CustomerContact
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .Include(x => x.Customer)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCustomerContactListDto>>(entities);
+
+        return new GetCustomerContactListResult
+        {
+            Data = dtos
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/CustomerGroupManager/Commands/CreateCustomerGroup.cs

@@ -0,0 +1,58 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerGroupManager.Commands;
+
+public class CreateCustomerGroupResult
+{
+    public CustomerGroup? Data { get; set; }
+}
+
+public class CreateCustomerGroupRequest : IRequest<CreateCustomerGroupResult>
+{
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateCustomerGroupValidator : AbstractValidator<CreateCustomerGroupRequest>
+{
+    public CreateCustomerGroupValidator()
+    {
+        RuleFor(x => x.Name).NotEmpty();
+    }
+}
+
+public class CreateCustomerGroupHandler : IRequestHandler<CreateCustomerGroupRequest, CreateCustomerGroupResult>
+{
+    private readonly ICommandRepository<CustomerGroup> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public CreateCustomerGroupHandler(
+        ICommandRepository<CustomerGroup> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<CreateCustomerGroupResult> Handle(CreateCustomerGroupRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new CustomerGroup();
+        entity.CreatedById = request.CreatedById;
+
+        entity.Name = request.Name;
+        entity.Description = request.Description;
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateCustomerGroupResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CustomerGroupManager/Commands/DeleteCustomerGroup.cs

@@ -0,0 +1,62 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerGroupManager.Commands;
+
+public class DeleteCustomerGroupResult
+{
+    public CustomerGroup? Data { get; set; }
+}
+
+public class DeleteCustomerGroupRequest : IRequest<DeleteCustomerGroupResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteCustomerGroupValidator : AbstractValidator<DeleteCustomerGroupRequest>
+{
+    public DeleteCustomerGroupValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteCustomerGroupHandler : IRequestHandler<DeleteCustomerGroupRequest, DeleteCustomerGroupResult>
+{
+    private readonly ICommandRepository<CustomerGroup> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteCustomerGroupHandler(
+        ICommandRepository<CustomerGroup> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteCustomerGroupResult> Handle(DeleteCustomerGroupRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteCustomerGroupResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerGroupManager/Commands/UpdateCustomerGroup.cs

@@ -0,0 +1,68 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerGroupManager.Commands;
+
+public class UpdateCustomerGroupResult
+{
+    public CustomerGroup? Data { get; set; }
+}
+
+public class UpdateCustomerGroupRequest : IRequest<UpdateCustomerGroupResult>
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateCustomerGroupValidator : AbstractValidator<UpdateCustomerGroupRequest>
+{
+    public UpdateCustomerGroupValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Name).NotEmpty();
+    }
+}
+
+public class UpdateCustomerGroupHandler : IRequestHandler<UpdateCustomerGroupRequest, UpdateCustomerGroupResult>
+{
+    private readonly ICommandRepository<CustomerGroup> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateCustomerGroupHandler(
+        ICommandRepository<CustomerGroup> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateCustomerGroupResult> Handle(UpdateCustomerGroupRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+
+        entity.Name = request.Name;
+        entity.Description = request.Description;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateCustomerGroupResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerGroupManager/Queries/GetCustomerGroupList.cs

@@ -0,0 +1,70 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CustomerGroupManager.Queries;
+
+public record GetCustomerGroupListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+    public string? Description { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCustomerGroupListProfile : Profile
+{
+    public GetCustomerGroupListProfile()
+    {
+        CreateMap<CustomerGroup, GetCustomerGroupListDto>();
+    }
+}
+
+public class GetCustomerGroupListResult
+{
+    public List<GetCustomerGroupListDto>? Data { get; init; }
+}
+
+public class GetCustomerGroupListRequest : IRequest<GetCustomerGroupListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+
+public class GetCustomerGroupListHandler : IRequestHandler<GetCustomerGroupListRequest, GetCustomerGroupListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCustomerGroupListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCustomerGroupListResult> Handle(GetCustomerGroupListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .CustomerGroup
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCustomerGroupListDto>>(entities);
+
+        return new GetCustomerGroupListResult
+        {
+            Data = dtos
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/CustomerManager/Commands/CreateCustomer.cs

@@ -0,0 +1,105 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerManager.Commands;
+
+public class CreateCustomerResult
+{
+    public Customer? Data { get; set; }
+}
+
+public class CreateCustomerRequest : IRequest<CreateCustomerResult>
+{
+    public string? Name { get; set; }
+    public string? Description { get; set; }
+    public string? Street { get; set; }
+    public string? City { get; set; }
+    public string? State { get; set; }
+    public string? ZipCode { get; set; }
+    public string? Country { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? FaxNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Website { get; set; }
+    public string? WhatsApp { get; set; }
+    public string? LinkedIn { get; set; }
+    public string? Facebook { get; set; }
+    public string? Instagram { get; set; }
+    public string? TwitterX { get; set; }
+    public string? TikTok { get; set; }
+    public string? CustomerGroupId { get; set; }
+    public string? CustomerCategoryId { get; set; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateCustomerValidator : AbstractValidator<CreateCustomerRequest>
+{
+    public CreateCustomerValidator()
+    {
+        RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.Street).NotEmpty();
+        RuleFor(x => x.City).NotEmpty();
+        RuleFor(x => x.State).NotEmpty();
+        RuleFor(x => x.ZipCode).NotEmpty();
+        RuleFor(x => x.PhoneNumber).NotEmpty();
+        RuleFor(x => x.EmailAddress).NotEmpty();
+        RuleFor(x => x.CustomerGroupId).NotEmpty();
+        RuleFor(x => x.CustomerCategoryId).NotEmpty();
+    }
+}
+
+public class CreateCustomerHandler : IRequestHandler<CreateCustomerRequest, CreateCustomerResult>
+{
+    private readonly ICommandRepository<Customer> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateCustomerHandler(
+        ICommandRepository<Customer> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateCustomerResult> Handle(CreateCustomerRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new Customer();
+        entity.CreatedById = request.CreatedById;
+
+        entity.Name = request.Name;
+        entity.Number = _numberSequenceService.GenerateNumber(nameof(Customer), "", "CST");
+        entity.Description = request.Description;
+        entity.Street = request.Street;
+        entity.City = request.City;
+        entity.State = request.State;
+        entity.ZipCode = request.ZipCode;
+        entity.Country = request.Country;
+        entity.PhoneNumber = request.PhoneNumber;
+        entity.FaxNumber = request.FaxNumber;
+        entity.EmailAddress = request.EmailAddress;
+        entity.Website = request.Website;
+        entity.WhatsApp = request.WhatsApp;
+        entity.LinkedIn = request.LinkedIn;
+        entity.Facebook = request.Facebook;
+        entity.Instagram = request.Instagram;
+        entity.TwitterX = request.TwitterX;
+        entity.TikTok = request.TikTok;
+        entity.CustomerGroupId = request.CustomerGroupId;
+        entity.CustomerCategoryId = request.CustomerCategoryId;
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateCustomerResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/CustomerManager/Commands/DeleteCustomer.cs

@@ -0,0 +1,62 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerManager.Commands;
+
+public class DeleteCustomerResult
+{
+    public Customer? Data { get; set; }
+}
+
+public class DeleteCustomerRequest : IRequest<DeleteCustomerResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteCustomerValidator : AbstractValidator<DeleteCustomerRequest>
+{
+    public DeleteCustomerValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteCustomerHandler : IRequestHandler<DeleteCustomerRequest, DeleteCustomerResult>
+{
+    private readonly ICommandRepository<Customer> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteCustomerHandler(
+        ICommandRepository<Customer> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteCustomerResult> Handle(DeleteCustomerRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteCustomerResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerManager/Commands/UpdateCustomer.cs

@@ -0,0 +1,111 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.CustomerManager.Commands;
+
+public class UpdateCustomerResult
+{
+    public Customer? Data { get; set; }
+}
+
+public class UpdateCustomerRequest : IRequest<UpdateCustomerResult>
+{
+    public string? Id { get; init; }
+    public string? Name { get; set; }
+    public string? Description { get; set; }
+    public string? Street { get; set; }
+    public string? City { get; set; }
+    public string? State { get; set; }
+    public string? ZipCode { get; set; }
+    public string? Country { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? FaxNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Website { get; set; }
+    public string? WhatsApp { get; set; }
+    public string? LinkedIn { get; set; }
+    public string? Facebook { get; set; }
+    public string? Instagram { get; set; }
+    public string? TwitterX { get; set; }
+    public string? TikTok { get; set; }
+    public string? CustomerGroupId { get; set; }
+    public string? CustomerCategoryId { get; set; }
+    public string? CreatedById { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateCustomerValidator : AbstractValidator<UpdateCustomerRequest>
+{
+    public UpdateCustomerValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Name).NotEmpty();
+        RuleFor(x => x.Street).NotEmpty();
+        RuleFor(x => x.City).NotEmpty();
+        RuleFor(x => x.State).NotEmpty();
+        RuleFor(x => x.ZipCode).NotEmpty();
+        RuleFor(x => x.PhoneNumber).NotEmpty();
+        RuleFor(x => x.EmailAddress).NotEmpty();
+        RuleFor(x => x.CustomerGroupId).NotEmpty();
+        RuleFor(x => x.CustomerCategoryId).NotEmpty();
+    }
+}
+
+public class UpdateCustomerHandler : IRequestHandler<UpdateCustomerRequest, UpdateCustomerResult>
+{
+    private readonly ICommandRepository<Customer> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateCustomerHandler(
+        ICommandRepository<Customer> repository,
+        IUnitOfWork unitOfWork
+        )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateCustomerResult> Handle(UpdateCustomerRequest request, CancellationToken cancellationToken)
+    {
+
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+
+        entity.Name = request.Name;
+        entity.Description = request.Description;
+        entity.Street = request.Street;
+        entity.City = request.City;
+        entity.State = request.State;
+        entity.ZipCode = request.ZipCode;
+        entity.Country = request.Country;
+        entity.PhoneNumber = request.PhoneNumber;
+        entity.FaxNumber = request.FaxNumber;
+        entity.EmailAddress = request.EmailAddress;
+        entity.Website = request.Website;
+        entity.WhatsApp = request.WhatsApp;
+        entity.LinkedIn = request.LinkedIn;
+        entity.Facebook = request.Facebook;
+        entity.Instagram = request.Instagram;
+        entity.TwitterX = request.TwitterX;
+        entity.TikTok = request.TikTok;
+        entity.CustomerGroupId = request.CustomerGroupId;
+        entity.CustomerCategoryId = request.CustomerCategoryId;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateCustomerResult
+        {
+            Data = entity
+        };
+    }
+}
+

Core/Application/Features/CustomerManager/Queries/GetCustomerList.cs

@@ -0,0 +1,102 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.CustomerManager.Queries;
+
+public record GetCustomerListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; set; }
+    public string? Number { get; set; }
+    public string? Description { get; set; }
+    public string? Street { get; set; }
+    public string? City { get; set; }
+    public string? State { get; set; }
+    public string? ZipCode { get; set; }
+    public string? Country { get; set; }
+    public string? PhoneNumber { get; set; }
+    public string? FaxNumber { get; set; }
+    public string? EmailAddress { get; set; }
+    public string? Website { get; set; }
+    public string? WhatsApp { get; set; }
+    public string? LinkedIn { get; set; }
+    public string? Facebook { get; set; }
+    public string? Instagram { get; set; }
+    public string? TwitterX { get; set; }
+    public string? TikTok { get; set; }
+    public string? CustomerGroupId { get; set; }
+    public string? CustomerGroupName { get; set; }
+    public string? CustomerCategoryId { get; set; }
+    public string? CustomerCategoryName { get; set; }
+    public string? CreatedById { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetCustomerListProfile : Profile
+{
+    public GetCustomerListProfile()
+    {
+        CreateMap<Customer, GetCustomerListDto>()
+            .ForMember(
+                dest => dest.CustomerGroupName,
+                opt => opt.MapFrom(src => src.CustomerGroup != null ? src.CustomerGroup.Name : string.Empty)
+            )
+            .ForMember(
+                dest => dest.CustomerCategoryName,
+                opt => opt.MapFrom(src => src.CustomerCategory != null ? src.CustomerCategory.Name : string.Empty)
+            );
+
+    }
+}
+
+public class GetCustomerListResult
+{
+    public List<GetCustomerListDto>? Data { get; init; }
+}
+
+public class GetCustomerListRequest : IRequest<GetCustomerListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+
+public class GetCustomerListHandler : IRequestHandler<GetCustomerListRequest, GetCustomerListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetCustomerListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetCustomerListResult> Handle(GetCustomerListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Customer
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .Include(x => x.CustomerGroup)
+            .Include(x => x.CustomerCategory)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetCustomerListDto>>(entities);
+
+        return new GetCustomerListResult
+        {
+            Data = dtos
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/DashboardManager/Queries/AccummulationChartItem.cs

@@ -0,0 +1,8 @@
+namespace Application.Features.DashboardManager.Queries;
+
+public class AccummulationChartItem
+{
+    public string X { get; init; } = string.Empty;
+    public double Y { get; init; } = 0.0;
+    public string Text { get; init; } = string.Empty;
+}

Core/Application/Features/DashboardManager/Queries/BarDataItem.cs

@@ -0,0 +1,8 @@
+namespace Application.Features.DashboardManager.Queries;
+
+public class BarDataItem
+{
+    public string X { get; set; } = string.Empty;
+    public int Y { get; set; }
+    public string TooltipMappingName { get; set; } = string.Empty;
+}

Core/Application/Features/DashboardManager/Queries/BarSeries.cs

@@ -0,0 +1,13 @@
+namespace Application.Features.DashboardManager.Queries;
+
+public class BarSeries
+{
+    public string Type { get; set; } = string.Empty;
+    public string XName { get; set; } = string.Empty;
+    public int Width { get; set; }
+    public string YName { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public double ColumnSpacing { get; set; }
+    public string TooltipMappingName { get; set; } = string.Empty;
+    public List<BarDataItem> DataSource { get; set; } = new List<BarDataItem>();
+}

Core/Application/Features/DashboardManager/Queries/CRMItem.cs

@@ -0,0 +1,10 @@
+namespace Application.Features.DashboardManager.Queries;
+
+public class CRMItem
+{
+    public double? CampaignTotalAmount { get; init; }
+    public double? LeadTotalAmount { get; init; }
+    public double? BudgetTotalAmount { get; init; }
+    public double? ExpenseTotalAmount { get; init; }
+    public double? ClosedTotalAmount { get; init; }
+}

Core/Application/Features/DashboardManager/Queries/CardsItem.cs

@@ -0,0 +1,13 @@
+namespace Application.Features.DashboardManager.Queries;
+
+public class CardsItem
+{
+    public double? SalesTotal { get; init; }
+    public double? SalesReturnTotal { get; init; }
+    public double? PurchaseTotal { get; init; }
+    public double? PurchaseReturnTotal { get; init; }
+    public double? DeliveryOrderTotal { get; init; }
+    public double? GoodsReceiveTotal { get; init; }
+    public double? TransferOutTotal { get; init; }
+    public double? TransferInTotal { get; init; }
+}

Core/Application/Features/DashboardManager/Queries/GetCRMDashboard.cs

@@ -0,0 +1,83 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+
+public class GetCRMDashboardDto
+{
+    public CRMItem? CRMDashboard { get; init; }
+}
+
+public class GetCRMDashboardResult
+{
+    public GetCRMDashboardDto? Data { get; init; }
+}
+
+public class GetCRMDashboardRequest : IRequest<GetCRMDashboardResult>
+{
+}
+
+public class GetCRMDashboardHandler : IRequestHandler<GetCRMDashboardRequest, GetCRMDashboardResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetCRMDashboardHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetCRMDashboardResult> Handle(GetCRMDashboardRequest request, CancellationToken cancellationToken)
+    {
+        var campaignTotalAmount = await _context.Campaign
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .SumAsync(x => (double?)x.TargetRevenueAmount, cancellationToken);
+
+        var closedTotalAmount = await _context.Lead
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Where(x => x.ClosingStatus == ClosingStatus.ClosedWon)
+            .SumAsync(x => (double?)x.AmountClosed, cancellationToken);
+
+        var leadTotalAmount = await _context.Lead
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .SumAsync(x => (double?)x.AmountTargeted, cancellationToken);
+
+        var budgetTotalAmount = await _context.Budget
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .SumAsync(x => (double?)x.Amount, cancellationToken);
+
+        var expenseTotalAmount = await _context.Expense
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .SumAsync(x => (double?)x.Amount, cancellationToken);
+
+
+        var cardsDashboardData = new CRMItem
+        {
+            CampaignTotalAmount = campaignTotalAmount,
+            LeadTotalAmount = leadTotalAmount,
+            BudgetTotalAmount = budgetTotalAmount,
+            ExpenseTotalAmount = expenseTotalAmount,
+            ClosedTotalAmount = closedTotalAmount
+        };
+
+
+
+        var result = new GetCRMDashboardResult
+        {
+            Data = new GetCRMDashboardDto
+            {
+                CRMDashboard = cardsDashboardData
+            }
+        };
+
+        return result;
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetCampaignByStatus.cs

@@ -0,0 +1,46 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+public class GetCampaignByStatusResult
+{
+    public List<AccummulationChartItem>? Data { get; init; }
+}
+
+public class GetCampaignByStatusRequest : IRequest<GetCampaignByStatusResult>
+{
+}
+
+public class GetCampaignByStatusHandler : IRequestHandler<GetCampaignByStatusRequest, GetCampaignByStatusResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetCampaignByStatusHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetCampaignByStatusResult> Handle(GetCampaignByStatusRequest request, CancellationToken cancellationToken)
+    {
+        var groupedCampaigns = await _context.Set<Campaign>()
+            .GroupBy(c => c.Status)
+            .Select(g => new { Status = g.Key, Count = g.Count() })
+            .ToListAsync(cancellationToken);
+
+        var result = groupedCampaigns.Select(g => new AccummulationChartItem
+        {
+            X = g.Status.HasValue ? ((CampaignStatus)g.Status).ToFriendlyName() : string.Empty,
+            Y = (double)g.Count,
+            Text = g.Status.HasValue
+                ? $"{((CampaignStatus)g.Status).ToFriendlyName()} ({g.Count})"
+                : $"Unknown ({g.Count})"
+        }).ToList();
+
+        return new GetCampaignByStatusResult { Data = result };
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetCardsDashboard.cs

@@ -0,0 +1,62 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+
+public class GetCardsDashboardDto
+{
+    public CardsItem? CardsDashboard { get; init; }
+}
+
+public class GetCardsDashboardResult
+{
+    public GetCardsDashboardDto? Data { get; init; }
+}
+
+public class GetCardsDashboardRequest : IRequest<GetCardsDashboardResult>
+{
+}
+
+public class GetCardsDashboardHandler : IRequestHandler<GetCardsDashboardRequest, GetCardsDashboardResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetCardsDashboardHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetCardsDashboardResult> Handle(GetCardsDashboardRequest request, CancellationToken cancellationToken)
+    {
+        var salesTotal = await _context.SalesOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .SumAsync(x => (double?)x.Quantity, cancellationToken);
+
+        var purchaseTotal = await _context.PurchaseOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .SumAsync(x => (double?)x.Quantity, cancellationToken);
+
+        var cardsDashboardData = new CardsItem
+        {
+            SalesTotal = salesTotal,
+            PurchaseTotal = purchaseTotal,
+        };
+
+
+
+        var result = new GetCardsDashboardResult
+        {
+            Data = new GetCardsDashboardDto
+            {
+                CardsDashboard = cardsDashboardData
+            }
+        };
+
+        return result;
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetLeadActivityByType.cs

@@ -0,0 +1,47 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+public class GetLeadActivityByTypeResult
+{
+    public List<AccummulationChartItem>? Data { get; init; }
+}
+
+public class GetLeadActivityByTypeRequest : IRequest<GetLeadActivityByTypeResult>
+{
+}
+
+public class GetLeadActivityByTypeHandler : IRequestHandler<GetLeadActivityByTypeRequest, GetLeadActivityByTypeResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetLeadActivityByTypeHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetLeadActivityByTypeResult> Handle(GetLeadActivityByTypeRequest request, CancellationToken cancellationToken)
+    {
+        var groupedActivities = await _context.Set<LeadActivity>()
+            .GroupBy(a => a.Type)
+            .Select(g => new { Type = g.Key, Count = g.Count() })
+            .OrderBy(g => g.Count)
+            .ToListAsync(cancellationToken);
+
+        var result = groupedActivities.Select(g => new AccummulationChartItem
+        {
+            X = g.Type.HasValue ? ((LeadActivityType)g.Type).ToFriendlyName() : string.Empty,
+            Y = (double)g.Count,
+            Text = g.Type.HasValue
+                ? $"{((LeadActivityType)g.Type).ToFriendlyName()} ({g.Count})"
+                : $"Unknown ({g.Count})"
+        }).ToList();
+
+        return new GetLeadActivityByTypeResult { Data = result };
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetLeadPipelineFunnel.cs

@@ -0,0 +1,53 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+public class GetLeadPipelineFunnelResult
+{
+    public List<AccummulationChartItem>? Data { get; init; }
+}
+
+public class GetLeadPipelineFunnelRequest : IRequest<GetLeadPipelineFunnelResult>
+{
+}
+
+public class GetLeadPipelineFunnelHandler : IRequestHandler<GetLeadPipelineFunnelRequest, GetLeadPipelineFunnelResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetLeadPipelineFunnelHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetLeadPipelineFunnelResult> Handle(GetLeadPipelineFunnelRequest request, CancellationToken cancellationToken)
+    {
+        var groupedLeads = await _context.Set<Lead>()
+            .GroupBy(l => l.PipelineStage)
+            .Select(g => new { Stage = g.Key, Count = g.Count() })
+            .ToListAsync(cancellationToken);
+
+        var result = groupedLeads.Select(g => new
+        {
+            Item = new AccummulationChartItem
+            {
+                X = g.Stage.HasValue ? ((PipelineStage)g.Stage).ToFriendlyName() : string.Empty,
+                Y = g.Count,
+                Text = g.Stage.HasValue
+                    ? $"{((PipelineStage)g.Stage).ToFriendlyName()} ({g.Count})"
+                    : $"Unknown ({g.Count})"
+            },
+            OrderKey = g.Stage.HasValue ? ((PipelineStage)g.Stage).ToFriendlyName() : string.Empty
+        })
+        .OrderByDescending(i => i.OrderKey)
+        .Select(i => i.Item)
+        .ToList();
+
+        return new GetLeadPipelineFunnelResult { Data = result };
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetPurchaseDashboard.cs

@@ -0,0 +1,150 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+
+public class GetPurchaseDashboardDto
+{
+    public List<PurchaseOrderItem>? PurchaseOrderDashboard { get; init; }
+    public List<BarSeries>? PurchaseByVendorGroupDashboard { get; init; }
+    public List<BarSeries>? PurchaseByVendorCategoryDashboard { get; init; }
+}
+
+public class GetPurchaseDashboardResult
+{
+    public GetPurchaseDashboardDto? Data { get; init; }
+}
+
+public class GetPurchaseDashboardRequest : IRequest<GetPurchaseDashboardResult>
+{
+}
+
+public class GetPurchaseDashboardHandler : IRequestHandler<GetPurchaseDashboardRequest, GetPurchaseDashboardResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetPurchaseDashboardHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetPurchaseDashboardResult> Handle(GetPurchaseDashboardRequest request, CancellationToken cancellationToken)
+    {
+
+        var purchaseOrderItemData = await _context.PurchaseOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.PurchaseOrder)
+            .Include(x => x.Product)
+            .Where(x => x.PurchaseOrder!.OrderStatus == PurchaseOrderStatus.Confirmed)
+            .OrderByDescending(x => x.PurchaseOrder!.OrderDate)
+            .Take(30)
+            .ToListAsync(cancellationToken);
+
+        var purchaseByVendorGroupData = _context.PurchaseOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+                .Include(x => x.PurchaseOrder)
+                    .ThenInclude(x => x!.Vendor)
+                        .ThenInclude(x => x!.VendorGroup)
+                .Include(x => x.Product)
+                .Where(x => x.Product!.Physical == true)
+            .Select(x => new
+            {
+                Status = x.PurchaseOrder!.OrderStatus,
+                VendorGroupName = x.PurchaseOrder!.Vendor!.VendorGroup!.Name,
+                Quantity = x.Quantity
+            })
+            .GroupBy(x => new { x.Status, x.VendorGroupName })
+            .Select(g => new
+            {
+                Status = g.Key.Status,
+                VendorGroupName = g.Key.VendorGroupName,
+                Quantity = g.Sum(x => x.Quantity)
+            })
+            .ToList();
+
+        var purchaseByVendorCategoryDate = _context.PurchaseOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.PurchaseOrder)
+                .ThenInclude(x => x!.Vendor)
+                    .ThenInclude(x => x!.VendorCategory)
+            .Include(x => x.Product)
+            .Where(x => x.Product!.Physical == true)
+            .Select(x => new
+            {
+                Status = x.PurchaseOrder!.OrderStatus,
+                VendorCategoryName = x.PurchaseOrder!.Vendor!.VendorCategory!.Name,
+                Quantity = x.Quantity
+            })
+            .GroupBy(x => new { x.Status, x.VendorCategoryName })
+            .Select(g => new
+            {
+                Status = g.Key.Status,
+                VendorCategoryName = g.Key.VendorCategoryName,
+                Quantity = g.Sum(x => x.Quantity)
+            })
+            .ToList();
+
+
+        var result = new GetPurchaseDashboardResult
+        {
+            Data = new GetPurchaseDashboardDto
+            {
+                PurchaseOrderDashboard = purchaseOrderItemData,
+                PurchaseByVendorGroupDashboard =
+                    Enum.GetValues(typeof(PurchaseOrderStatus))
+                    .Cast<PurchaseOrderStatus>()
+                    .Select(status => new BarSeries
+                    {
+                        Type = "Bar",
+                        XName = "x",
+                        Width = 2,
+                        YName = "y",
+                        Name = Enum.GetName(typeof(PurchaseOrderStatus), status)!,
+                        ColumnSpacing = 0.1,
+                        TooltipMappingName = "tooltipMappingName",
+                        DataSource = purchaseByVendorGroupData
+                            .Where(x => x.Status == status)
+                            .Select(x => new BarDataItem
+                            {
+                                X = x.VendorGroupName ?? "",
+                                TooltipMappingName = x.VendorGroupName ?? "",
+                                Y = (int)x.Quantity!.Value
+                            }).ToList()
+                    })
+                    .ToList(),
+                PurchaseByVendorCategoryDashboard =
+                    Enum.GetValues(typeof(PurchaseOrderStatus))
+                    .Cast<PurchaseOrderStatus>()
+                    .Select(status => new BarSeries
+                    {
+                        Type = "Column",
+                        XName = "x",
+                        Width = 2,
+                        YName = "y",
+                        Name = Enum.GetName(typeof(PurchaseOrderStatus), status)!,
+                        ColumnSpacing = 0.1,
+                        TooltipMappingName = "tooltipMappingName",
+                        DataSource = purchaseByVendorCategoryDate
+                            .Where(x => x.Status == status)
+                            .Select(x => new BarDataItem
+                            {
+                                X = x.VendorCategoryName ?? "",
+                                TooltipMappingName = x.VendorCategoryName ?? "",
+                                Y = (int)x.Quantity!.Value
+                            }).ToList()
+                    })
+                    .ToList(),
+            }
+        };
+
+        return result;
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetSalesDashboard.cs

@@ -0,0 +1,150 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+
+public class GetSalesDashboardDto
+{
+    public List<SalesOrderItem>? SalesOrderDashboard { get; init; }
+    public List<BarSeries>? SalesByCustomerGroupDashboard { get; init; }
+    public List<BarSeries>? SalesByCustomerCategoryDashboard { get; init; }
+}
+
+public class GetSalesDashboardResult
+{
+    public GetSalesDashboardDto? Data { get; init; }
+}
+
+public class GetSalesDashboardRequest : IRequest<GetSalesDashboardResult>
+{
+}
+
+public class GetSalesDashboardHandler : IRequestHandler<GetSalesDashboardRequest, GetSalesDashboardResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetSalesDashboardHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetSalesDashboardResult> Handle(GetSalesDashboardRequest request, CancellationToken cancellationToken)
+    {
+
+        var salesOrderItemData = await _context.SalesOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.SalesOrder)
+            .Include(x => x.Product)
+            .Where(x => x.SalesOrder!.OrderStatus == SalesOrderStatus.Confirmed)
+            .OrderByDescending(x => x.SalesOrder!.OrderDate)
+            .Take(30)
+            .ToListAsync(cancellationToken);
+
+        var salesByCustomerGroupData = _context.SalesOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+                .Include(x => x.SalesOrder)
+                    .ThenInclude(x => x!.Customer)
+                        .ThenInclude(x => x!.CustomerGroup)
+                .Include(x => x.Product)
+                .Where(x => x.Product!.Physical == true)
+            .Select(x => new
+            {
+                Status = x.SalesOrder!.OrderStatus,
+                CustomerGroupName = x.SalesOrder!.Customer!.CustomerGroup!.Name,
+                Quantity = x.Quantity
+            })
+            .GroupBy(x => new { x.Status, x.CustomerGroupName })
+            .Select(g => new
+            {
+                Status = g.Key.Status,
+                CustomerGroupName = g.Key.CustomerGroupName,
+                Quantity = g.Sum(x => x.Quantity)
+            })
+            .ToList();
+
+        var salesByCustomerCategoryData = _context.SalesOrderItem
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.SalesOrder)
+                .ThenInclude(x => x!.Customer)
+                    .ThenInclude(x => x!.CustomerCategory)
+            .Include(x => x.Product)
+            .Where(x => x.Product!.Physical == true)
+            .Select(x => new
+            {
+                Status = x.SalesOrder!.OrderStatus,
+                CustomerCategoryName = x.SalesOrder!.Customer!.CustomerCategory!.Name,
+                Quantity = x.Quantity
+            })
+            .GroupBy(x => new { x.Status, x.CustomerCategoryName })
+            .Select(g => new
+            {
+                Status = g.Key.Status,
+                CustomerCategoryName = g.Key.CustomerCategoryName,
+                Quantity = g.Sum(x => x.Quantity)
+            })
+            .ToList();
+
+
+        var result = new GetSalesDashboardResult
+        {
+            Data = new GetSalesDashboardDto
+            {
+                SalesOrderDashboard = salesOrderItemData,
+                SalesByCustomerGroupDashboard =
+                    Enum.GetValues(typeof(SalesOrderStatus))
+                    .Cast<SalesOrderStatus>()
+                    .Select(status => new BarSeries
+                    {
+                        Type = "Column",
+                        XName = "x",
+                        Width = 2,
+                        YName = "y",
+                        Name = Enum.GetName(typeof(SalesOrderStatus), status)!,
+                        ColumnSpacing = 0.1,
+                        TooltipMappingName = "tooltipMappingName",
+                        DataSource = salesByCustomerGroupData
+                            .Where(x => x.Status == status)
+                            .Select(x => new BarDataItem
+                            {
+                                X = x.CustomerGroupName ?? "",
+                                TooltipMappingName = x.CustomerGroupName ?? "",
+                                Y = (int)x.Quantity!.Value
+                            }).ToList()
+                    })
+                    .ToList(),
+                SalesByCustomerCategoryDashboard =
+                    Enum.GetValues(typeof(SalesOrderStatus))
+                    .Cast<SalesOrderStatus>()
+                    .Select(status => new BarSeries
+                    {
+                        Type = "Bar",
+                        XName = "x",
+                        Width = 2,
+                        YName = "y",
+                        Name = Enum.GetName(typeof(SalesOrderStatus), status)!,
+                        ColumnSpacing = 0.1,
+                        TooltipMappingName = "tooltipMappingName",
+                        DataSource = salesByCustomerCategoryData
+                            .Where(x => x.Status == status)
+                            .Select(x => new BarDataItem
+                            {
+                                X = x.CustomerCategoryName ?? "",
+                                TooltipMappingName = x.CustomerCategoryName ?? "",
+                                Y = (int)x.Quantity!.Value
+                            }).ToList()
+                    })
+                    .ToList()
+            }
+        };
+
+        return result;
+    }
+}

Core/Application/Features/DashboardManager/Queries/GetSalesTeamLeadClosing.cs

@@ -0,0 +1,58 @@
+using Application.Common.CQS.Queries;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.DashboardManager.Queries;
+
+public class GetSalesTeamLeadClosingResult
+{
+    public List<AccummulationChartItem>? Data { get; init; }
+}
+
+public class GetSalesTeamLeadClosingRequest : IRequest<GetSalesTeamLeadClosingResult>
+{
+}
+
+public class GetSalesTeamLeadClosingHandler : IRequestHandler<GetSalesTeamLeadClosingRequest, GetSalesTeamLeadClosingResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetSalesTeamLeadClosingHandler(IQueryContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<GetSalesTeamLeadClosingResult> Handle(GetSalesTeamLeadClosingRequest request, CancellationToken cancellationToken)
+    {
+        var groupedLeads = await _context.Set<Lead>()
+            .Include(l => l.SalesTeam)
+            .Where(l => l.SalesTeam != null && l.AmountClosed.HasValue)
+            .GroupBy(l => l.SalesTeam!.Name)
+            .Select(g => new
+            {
+                Name = g.Key,
+                TotalClosed = g.Sum(l => l.AmountClosed ?? 0)
+            })
+            .ToListAsync(cancellationToken);
+
+        var totalAmountClosed = groupedLeads.Sum(g => g.TotalClosed);
+
+        var result = groupedLeads.Select(g =>
+        {
+            double percentageValue = totalAmountClosed > 0
+                ? (double)g.TotalClosed / totalAmountClosed * 100
+                : 0;
+            var percentage = percentageValue.ToString("F2");
+
+            return new AccummulationChartItem
+            {
+                X = g.Name ?? "Unknown",
+                Y = Math.Round(percentageValue, 2),
+                Text = $"{g.Name ?? "Unknown"} ({Math.Round(percentageValue, 2)}%)"
+            };
+        }).ToList();
+
+        return new GetSalesTeamLeadClosingResult { Data = result };
+    }
+}

Core/Application/Features/ExpenseManager/Commands/CreateExpense.cs

@@ -0,0 +1,77 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.ExpenseManager.Commands;
+
+public class CreateExpenseResult
+{
+    public Expense? Data { get; set; }
+}
+
+public class CreateExpenseRequest : IRequest<CreateExpenseResult>
+{
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? ExpenseDate { get; init; }
+    public string? Status { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateExpenseValidator : AbstractValidator<CreateExpenseRequest>
+{
+    public CreateExpenseValidator()
+    {
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.ExpenseDate).NotNull();
+        RuleFor(x => x.Amount).NotNull();
+        RuleFor(x => x.CampaignId).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+    }
+}
+
+public class CreateExpenseHandler : IRequestHandler<CreateExpenseRequest, CreateExpenseResult>
+{
+    private readonly ICommandRepository<Expense> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateExpenseHandler(
+        ICommandRepository<Expense> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateExpenseResult> Handle(CreateExpenseRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new Expense
+        {
+            CreatedById = request.CreatedById,
+            Number = _numberSequenceService.GenerateNumber(nameof(Expense), "", "EXP"),
+            Title = request.Title,
+            Description = request.Description,
+            ExpenseDate = request.ExpenseDate,
+            Status = (ExpenseStatus)int.Parse(request.Status!),
+            Amount = request.Amount,
+            CampaignId = request.CampaignId
+        };
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateExpenseResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/ExpenseManager/Commands/DeleteExpense.cs

@@ -0,0 +1,60 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.ExpenseManager.Commands;
+
+public class DeleteExpenseResult
+{
+    public Expense? Data { get; set; }
+}
+
+public class DeleteExpenseRequest : IRequest<DeleteExpenseResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteExpenseValidator : AbstractValidator<DeleteExpenseRequest>
+{
+    public DeleteExpenseValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteExpenseHandler : IRequestHandler<DeleteExpenseRequest, DeleteExpenseResult>
+{
+    private readonly ICommandRepository<Expense> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteExpenseHandler(
+        ICommandRepository<Expense> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteExpenseResult> Handle(DeleteExpenseRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteExpenseResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/ExpenseManager/Commands/UpdateExpense.cs

@@ -0,0 +1,78 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.ExpenseManager.Commands;
+
+public class UpdateExpenseResult
+{
+    public Expense? Data { get; set; }
+}
+
+public class UpdateExpenseRequest : IRequest<UpdateExpenseResult>
+{
+    public string? Id { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? ExpenseDate { get; init; }
+    public string? Status { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateExpenseValidator : AbstractValidator<UpdateExpenseRequest>
+{
+    public UpdateExpenseValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.ExpenseDate).NotNull();
+        RuleFor(x => x.Amount).NotNull();
+        RuleFor(x => x.CampaignId).NotEmpty();
+        RuleFor(x => x.Status).NotEmpty();
+    }
+}
+
+public class UpdateExpenseHandler : IRequestHandler<UpdateExpenseRequest, UpdateExpenseResult>
+{
+    private readonly ICommandRepository<Expense> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateExpenseHandler(
+        ICommandRepository<Expense> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateExpenseResult> Handle(UpdateExpenseRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+        entity.Title = request.Title;
+        entity.Description = request.Description;
+        entity.ExpenseDate = request.ExpenseDate;
+        entity.Status = (ExpenseStatus)int.Parse(request.Status!);
+        entity.Amount = request.Amount;
+        entity.CampaignId = request.CampaignId;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateExpenseResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/ExpenseManager/Queries/GetExpenseByCampaignIdList.cs

@@ -0,0 +1,82 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.ExpenseManager.Queries;
+
+public record GetExpenseByCampaignIdListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? ExpenseDate { get; init; }
+    public ExpenseStatus? Status { get; init; }
+    public string? StatusName { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? CampaignName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetExpenseByCampaignIdListProfile : Profile
+{
+    public GetExpenseByCampaignIdListProfile()
+    {
+        CreateMap<Expense, GetExpenseByCampaignIdListDto>()
+            .ForMember(
+                dest => dest.CampaignName,
+                opt => opt.MapFrom(src => src.Campaign != null ? src.Campaign.Title : string.Empty)
+            )
+            .ForMember(
+                dest => dest.StatusName,
+                opt => opt.MapFrom(src => src.Status.HasValue ? src.Status.Value.ToFriendlyName() : string.Empty)
+            );
+    }
+}
+
+public class GetExpenseByCampaignIdListResult
+{
+    public List<GetExpenseByCampaignIdListDto>? Data { get; init; }
+}
+
+public class GetExpenseByCampaignIdListRequest : IRequest<GetExpenseByCampaignIdListResult>
+{
+    public string? CampaignId { get; init; }
+}
+
+public class GetExpenseByCampaignIdListHandler : IRequestHandler<GetExpenseByCampaignIdListRequest, GetExpenseByCampaignIdListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetExpenseByCampaignIdListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetExpenseByCampaignIdListResult> Handle(GetExpenseByCampaignIdListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Expense
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Include(x => x.Campaign)
+            .Where(x => x.CampaignId == request.CampaignId)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetExpenseByCampaignIdListDto>>(entities);
+
+        return new GetExpenseByCampaignIdListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/ExpenseManager/Queries/GetExpenseList.cs

@@ -0,0 +1,81 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.ExpenseManager.Queries;
+
+public record GetExpenseListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public DateTime? ExpenseDate { get; init; }
+    public ExpenseStatus? Status { get; init; }
+    public string? StatusName { get; init; }
+    public double? Amount { get; init; }
+    public string? CampaignId { get; init; }
+    public string? CampaignName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetExpenseListProfile : Profile
+{
+    public GetExpenseListProfile()
+    {
+        CreateMap<Expense, GetExpenseListDto>()
+            .ForMember(
+                dest => dest.CampaignName,
+                opt => opt.MapFrom(src => src.Campaign != null ? src.Campaign.Title : string.Empty)
+            )
+            .ForMember(
+                dest => dest.StatusName,
+                opt => opt.MapFrom(src => src.Status.HasValue ? src.Status.Value.ToFriendlyName() : string.Empty)
+            );
+    }
+}
+
+public class GetExpenseListResult
+{
+    public List<GetExpenseListDto>? Data { get; init; }
+}
+
+public class GetExpenseListRequest : IRequest<GetExpenseListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+public class GetExpenseListHandler : IRequestHandler<GetExpenseListRequest, GetExpenseListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetExpenseListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetExpenseListResult> Handle(GetExpenseListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Expense
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .Include(x => x.Campaign)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetExpenseListDto>>(entities);
+
+        return new GetExpenseListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/ExpenseManager/Queries/GetExpenseSingle.cs

@@ -0,0 +1,62 @@
+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.ExpenseManager.Queries;
+
+public class GetExpenseSingleProfile : Profile
+{
+    public GetExpenseSingleProfile()
+    {
+    }
+}
+
+public class GetExpenseSingleResult
+{
+    public Expense? Data { get; init; }
+}
+
+public class GetExpenseSingleRequest : IRequest<GetExpenseSingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetExpenseSingleValidator : AbstractValidator<GetExpenseSingleRequest>
+{
+    public GetExpenseSingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetExpenseSingleHandler : IRequestHandler<GetExpenseSingleRequest, GetExpenseSingleResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetExpenseSingleHandler(
+        IQueryContext context
+    )
+    {
+        _context = context;
+    }
+
+    public async Task<GetExpenseSingleResult> Handle(GetExpenseSingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Expense
+            .AsNoTracking()
+            .Include(x => x.Campaign)
+            .Where(x => x.Id == request.Id)
+            .AsQueryable();
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        return new GetExpenseSingleResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/ExpenseManager/Queries/GetExpenseStatus.cs

@@ -0,0 +1,54 @@
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Enums;
+using MediatR;
+
+namespace Application.Features.ExpenseManager.Queries;
+
+public record GetExpenseStatusListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+}
+
+public class GetExpenseStatusListProfile : Profile
+{
+    public GetExpenseStatusListProfile()
+    {
+    }
+}
+
+public class GetExpenseStatusListResult
+{
+    public List<GetExpenseStatusListDto>? Data { get; init; }
+}
+
+public class GetExpenseStatusListRequest : IRequest<GetExpenseStatusListResult>
+{
+}
+
+public class GetExpenseStatusListHandler : IRequestHandler<GetExpenseStatusListRequest, GetExpenseStatusListResult>
+{
+    public GetExpenseStatusListHandler()
+    {
+    }
+
+    public async Task<GetExpenseStatusListResult> Handle(GetExpenseStatusListRequest request, CancellationToken cancellationToken)
+    {
+        var statuses = Enum.GetValues(typeof(ExpenseStatus))
+            .Cast<ExpenseStatus>()
+            .Select(status => new GetExpenseStatusListDto
+            {
+                Id = ((int)status).ToString(),
+                Name = status.ToFriendlyName()
+            })
+            .ToList();
+
+        await Task.CompletedTask;
+
+        return new GetExpenseStatusListResult
+        {
+            Data = statuses
+        };
+    }
+}

Core/Application/Features/FileDocumentManager/Commands/CreateDocument.cs

@@ -0,0 +1,63 @@
+using Application.Common.Services.FileDocumentManager;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.FileDocumentManager.Commands;
+
+public class CreateDocumentResult
+{
+    public string? DocumentName { get; init; }
+}
+
+public class CreateDocumentRequest : IRequest<CreateDocumentResult>
+{
+    public string? OriginalFileName { get; init; }
+    public string? Extension { get; init; }
+    public byte[]? Data { get; init; }
+    public long? Size { get; init; }
+    public string? CreatedById { get; init; }
+    public string? Description { get; init; }
+}
+
+public class CreateDocumentValidator : AbstractValidator<CreateDocumentRequest>
+{
+    public CreateDocumentValidator()
+    {
+        RuleFor(x => x.OriginalFileName)
+            .NotEmpty();
+
+        RuleFor(x => x.Extension)
+            .NotEmpty();
+
+        RuleFor(x => x.Data)
+            .NotEmpty();
+
+        RuleFor(x => x.Size)
+            .NotEmpty();
+    }
+}
+
+public class CreateDocumentHandler : IRequestHandler<CreateDocumentRequest, CreateDocumentResult>
+{
+    private readonly IFileDocumentService _uploadDocument;
+
+    public CreateDocumentHandler(IFileDocumentService uploadDocument)
+    {
+        _uploadDocument = uploadDocument;
+    }
+
+    public async Task<CreateDocumentResult> Handle(CreateDocumentRequest request, CancellationToken cancellationToken)
+    {
+        var result = await _uploadDocument.UploadAsync(
+            request.OriginalFileName,
+            request.Extension,
+            request.Data,
+            request.Size,
+            request.Description,
+            request.CreatedById,
+            cancellationToken);
+
+        return new CreateDocumentResult { DocumentName = result };
+    }
+}
+

Core/Application/Features/FileDocumentManager/Queries/GetDocument.cs

@@ -0,0 +1,44 @@
+using Application.Common.Services.FileDocumentManager;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.FileDocumentManager.Queries;
+
+
+public class GetDocumentResult
+{
+    public byte[]? Data { get; init; }
+}
+
+public class GetDocumentRequest : IRequest<GetDocumentResult>
+{
+    public string? DocumentName { get; init; }
+}
+
+public class GetDocumentValidator : AbstractValidator<GetDocumentRequest>
+{
+    public GetDocumentValidator()
+    {
+        RuleFor(x => x.DocumentName)
+            .NotEmpty();
+    }
+}
+
+public class GetDocumentHandler : IRequestHandler<GetDocumentRequest, GetDocumentResult>
+{
+    private readonly IFileDocumentService _documentService;
+
+    public GetDocumentHandler(IFileDocumentService documentService)
+    {
+        _documentService = documentService;
+    }
+
+    public async Task<GetDocumentResult> Handle(GetDocumentRequest request, CancellationToken cancellationToken)
+    {
+        var result = await _documentService.GetFileAsync(request.DocumentName ?? "", cancellationToken);
+
+        return new GetDocumentResult { Data = result };
+    }
+}
+
+

Core/Application/Features/FileImageManager/Commands/CreateImage.cs

@@ -0,0 +1,63 @@
+using Application.Common.Services.FileImageManager;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.FileImageManager.Commands;
+
+public class CreateImageResult
+{
+    public string? ImageName { get; init; }
+}
+
+public class CreateImageRequest : IRequest<CreateImageResult>
+{
+    public string? OriginalFileName { get; init; }
+    public string? Extension { get; init; }
+    public byte[]? Data { get; init; }
+    public long? Size { get; init; }
+    public string? CreatedById { get; init; }
+    public string? Description { get; init; }
+}
+
+public class CreateImageValidator : AbstractValidator<CreateImageRequest>
+{
+    public CreateImageValidator()
+    {
+        RuleFor(x => x.OriginalFileName)
+            .NotEmpty();
+
+        RuleFor(x => x.Extension)
+            .NotEmpty();
+
+        RuleFor(x => x.Data)
+            .NotEmpty();
+
+        RuleFor(x => x.Size)
+            .NotEmpty();
+    }
+}
+
+public class CreateImageHandler : IRequestHandler<CreateImageRequest, CreateImageResult>
+{
+    private readonly IFileImageService _uploadImage;
+
+    public CreateImageHandler(IFileImageService uploadImage)
+    {
+        _uploadImage = uploadImage;
+    }
+
+    public async Task<CreateImageResult> Handle(CreateImageRequest request, CancellationToken cancellationToken)
+    {
+        var result = await _uploadImage.UploadAsync(
+            request.OriginalFileName,
+            request.Extension,
+            request.Data,
+            request.Size,
+            request.Description,
+            request.CreatedById,
+            cancellationToken);
+
+        return new CreateImageResult { ImageName = result };
+    }
+}
+

Core/Application/Features/FileImageManager/Queries/GetImage.cs

@@ -0,0 +1,44 @@
+using Application.Common.Services.FileImageManager;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.FileImageManager.Queries;
+
+
+public class GetImageResult
+{
+    public byte[]? Data { get; init; }
+}
+
+public class GetImageRequest : IRequest<GetImageResult>
+{
+    public string? ImageName { get; init; }
+}
+
+public class GetImageValidator : AbstractValidator<GetImageRequest>
+{
+    public GetImageValidator()
+    {
+        RuleFor(x => x.ImageName)
+            .NotEmpty();
+    }
+}
+
+public class GetImageHandler : IRequestHandler<GetImageRequest, GetImageResult>
+{
+    private readonly IFileImageService _imageService;
+
+    public GetImageHandler(IFileImageService imageService)
+    {
+        _imageService = imageService;
+    }
+
+    public async Task<GetImageResult> Handle(GetImageRequest request, CancellationToken cancellationToken)
+    {
+        var result = await _imageService.GetFileAsync(request.ImageName ?? "", cancellationToken);
+
+        return new GetImageResult { Data = result };
+    }
+}
+
+

Core/Application/Features/LeadActivityManager/Commands/CreateLeadActivity.cs

@@ -0,0 +1,79 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadActivityManager.Commands;
+
+public class CreateLeadActivityResult
+{
+    public LeadActivity? Data { get; set; }
+}
+
+public class CreateLeadActivityRequest : IRequest<CreateLeadActivityResult>
+{
+    public string? LeadId { get; init; }
+    public string? Summary { get; init; }
+    public string? Description { get; init; }
+    public DateTime? FromDate { get; init; }
+    public DateTime? ToDate { get; init; }
+    public string? Type { get; init; }
+    public string? AttachmentName { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateLeadActivityValidator : AbstractValidator<CreateLeadActivityRequest>
+{
+    public CreateLeadActivityValidator()
+    {
+        RuleFor(x => x.LeadId).NotEmpty();
+        RuleFor(x => x.Summary).NotEmpty();
+        RuleFor(x => x.FromDate).NotNull();
+        RuleFor(x => x.ToDate).NotNull();
+        RuleFor(x => x.Type).NotEmpty();
+    }
+}
+
+public class CreateLeadActivityHandler : IRequestHandler<CreateLeadActivityRequest, CreateLeadActivityResult>
+{
+    private readonly ICommandRepository<LeadActivity> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateLeadActivityHandler(
+        ICommandRepository<LeadActivity> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateLeadActivityResult> Handle(CreateLeadActivityRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new LeadActivity
+        {
+            CreatedById = request.CreatedById,
+            LeadId = request.LeadId,
+            Number = _numberSequenceService.GenerateNumber(nameof(LeadActivity), "", "LA"),
+            Summary = request.Summary,
+            Description = request.Description,
+            FromDate = request.FromDate,
+            ToDate = request.ToDate,
+            Type = (LeadActivityType)int.Parse(request.Type!),
+            AttachmentName = request.AttachmentName
+        };
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateLeadActivityResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadActivityManager/Commands/DeleteLeadActivity.cs

@@ -0,0 +1,60 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadActivityManager.Commands;
+
+public class DeleteLeadActivityResult
+{
+    public LeadActivity? Data { get; set; }
+}
+
+public class DeleteLeadActivityRequest : IRequest<DeleteLeadActivityResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteLeadActivityValidator : AbstractValidator<DeleteLeadActivityRequest>
+{
+    public DeleteLeadActivityValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteLeadActivityHandler : IRequestHandler<DeleteLeadActivityRequest, DeleteLeadActivityResult>
+{
+    private readonly ICommandRepository<LeadActivity> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteLeadActivityHandler(
+        ICommandRepository<LeadActivity> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteLeadActivityResult> Handle(DeleteLeadActivityRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteLeadActivityResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadActivityManager/Commands/UpdateLeadActivity.cs

@@ -0,0 +1,79 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadActivityManager.Commands;
+
+public class UpdateLeadActivityResult
+{
+    public LeadActivity? Data { get; set; }
+}
+
+public class UpdateLeadActivityRequest : IRequest<UpdateLeadActivityResult>
+{
+    public string? Id { get; init; }
+    public string? LeadId { get; init; }
+    public string? Summary { get; init; }
+    public string? Description { get; init; }
+    public DateTime? FromDate { get; init; }
+    public DateTime? ToDate { get; init; }
+    public string? Type { get; init; }
+    public string? AttachmentName { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateLeadActivityValidator : AbstractValidator<UpdateLeadActivityRequest>
+{
+    public UpdateLeadActivityValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Summary).NotEmpty();
+        RuleFor(x => x.FromDate).NotNull();
+        RuleFor(x => x.ToDate).NotNull();
+        RuleFor(x => x.Type).NotEmpty();
+    }
+}
+
+public class UpdateLeadActivityHandler : IRequestHandler<UpdateLeadActivityRequest, UpdateLeadActivityResult>
+{
+    private readonly ICommandRepository<LeadActivity> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateLeadActivityHandler(
+        ICommandRepository<LeadActivity> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateLeadActivityResult> Handle(UpdateLeadActivityRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+        entity.LeadId = request.LeadId;
+        entity.Summary = request.Summary;
+        entity.Description = request.Description;
+        entity.FromDate = request.FromDate;
+        entity.ToDate = request.ToDate;
+        entity.Type = (LeadActivityType)int.Parse(request.Type!);
+        entity.AttachmentName = request.AttachmentName;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateLeadActivityResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadActivityManager/Queries/GetLeadActivityByLeadIdList.cs

@@ -0,0 +1,76 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.LeadActivityManager.Queries;
+
+public record GetLeadActivityByLeadIdListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Summary { get; init; }
+    public string? Description { get; init; }
+    public DateTime? FromDate { get; init; }
+    public DateTime? ToDate { get; init; }
+    public LeadActivityType? Type { get; init; }
+    public string? TypeName { get; init; }
+    public string? AttachmentName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetLeadActivityByLeadIdListProfile : Profile
+{
+    public GetLeadActivityByLeadIdListProfile()
+    {
+        CreateMap<LeadActivity, GetLeadActivityByLeadIdListDto>()
+            .ForMember(
+                dest => dest.TypeName,
+                opt => opt.MapFrom(src => src.Type.HasValue ? src.Type.Value.ToFriendlyName() : string.Empty)
+            );
+    }
+}
+
+public class GetLeadActivityByLeadIdListResult
+{
+    public List<GetLeadActivityByLeadIdListDto>? Data { get; init; }
+}
+
+public class GetLeadActivityByLeadIdListRequest : IRequest<GetLeadActivityByLeadIdListResult>
+{
+    public string? LeadId { get; init; }
+}
+
+public class GetLeadActivityByLeadIdListHandler : IRequestHandler<GetLeadActivityByLeadIdListRequest, GetLeadActivityByLeadIdListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetLeadActivityByLeadIdListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetLeadActivityByLeadIdListResult> Handle(GetLeadActivityByLeadIdListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .LeadActivity
+            .AsNoTracking()
+            .IsDeletedEqualTo(false)
+            .Where(x => x.LeadId == request.LeadId)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetLeadActivityByLeadIdListDto>>(entities);
+
+        return new GetLeadActivityByLeadIdListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/LeadActivityManager/Queries/GetLeadActivityList.cs

@@ -0,0 +1,82 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.LeadActivityManager.Queries;
+
+public record GetLeadActivityListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? Summary { get; init; }
+    public string? Description { get; init; }
+    public DateTime? FromDate { get; init; }
+    public DateTime? ToDate { get; init; }
+    public LeadActivityType? Type { get; init; }
+    public string? TypeName { get; init; }
+    public string? AttachmentName { get; init; }
+    public string? LeadId { get; init; }
+    public string? LeadTitle { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetLeadActivityListProfile : Profile
+{
+    public GetLeadActivityListProfile()
+    {
+        CreateMap<LeadActivity, GetLeadActivityListDto>()
+            .ForMember(
+                dest => dest.TypeName,
+                opt => opt.MapFrom(src => src.Type.HasValue ? src.Type.Value.ToFriendlyName() : string.Empty)
+            )
+            .ForMember(
+                dest => dest.LeadTitle,
+                opt => opt.MapFrom(src => src.Lead != null ? src.Lead.Title : string.Empty)
+            );
+    }
+}
+
+public class GetLeadActivityListResult
+{
+    public List<GetLeadActivityListDto>? Data { get; init; }
+}
+
+public class GetLeadActivityListRequest : IRequest<GetLeadActivityListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+public class GetLeadActivityListHandler : IRequestHandler<GetLeadActivityListRequest, GetLeadActivityListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetLeadActivityListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetLeadActivityListResult> Handle(GetLeadActivityListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .LeadActivity
+            .Include(x => x.Lead)
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetLeadActivityListDto>>(entities);
+
+        return new GetLeadActivityListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/LeadActivityManager/Queries/GetLeadActivitySingle.cs

@@ -0,0 +1,61 @@
+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.LeadActivityManager.Queries;
+
+public class GetLeadActivitySingleProfile : Profile
+{
+    public GetLeadActivitySingleProfile()
+    {
+    }
+}
+
+public class GetLeadActivitySingleResult
+{
+    public LeadActivity? Data { get; init; }
+}
+
+public class GetLeadActivitySingleRequest : IRequest<GetLeadActivitySingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetLeadActivitySingleValidator : AbstractValidator<GetLeadActivitySingleRequest>
+{
+    public GetLeadActivitySingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetLeadActivitySingleHandler : IRequestHandler<GetLeadActivitySingleRequest, GetLeadActivitySingleResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetLeadActivitySingleHandler(
+        IQueryContext context
+    )
+    {
+        _context = context;
+    }
+
+    public async Task<GetLeadActivitySingleResult> Handle(GetLeadActivitySingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .LeadActivity
+            .AsNoTracking()
+            .Where(x => x.Id == request.Id)
+            .AsQueryable();
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        return new GetLeadActivitySingleResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadActivityManager/Queries/GetLeadActivityTypeList.cs

@@ -0,0 +1,61 @@
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Enums;
+using MediatR;
+
+namespace Application.Features.DeliveryOrderManager.Queries;
+
+public record GetLeadActivityTypeListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+}
+
+public class GetLeadActivityTypeListProfile : Profile
+{
+    public GetLeadActivityTypeListProfile()
+    {
+    }
+}
+
+public class GetLeadActivityTypeListResult
+{
+    public List<GetLeadActivityTypeListDto>? Data { get; init; }
+}
+
+public class GetLeadActivityTypeListRequest : IRequest<GetLeadActivityTypeListResult>
+{
+}
+
+
+public class GetLeadActivityTypeListHandler : IRequestHandler<GetLeadActivityTypeListRequest, GetLeadActivityTypeListResult>
+{
+
+    public GetLeadActivityTypeListHandler()
+    {
+    }
+
+    public async Task<GetLeadActivityTypeListResult> Handle(GetLeadActivityTypeListRequest request, CancellationToken cancellationToken)
+    {
+        var statuses = Enum.GetValues(typeof(LeadActivityType))
+            .Cast<LeadActivityType>()
+            .Select(status => new GetLeadActivityTypeListDto
+            {
+                Id = ((int)status).ToString(),
+                Name = status.ToFriendlyName()
+            })
+            .ToList();
+
+        await Task.CompletedTask;
+
+        return new GetLeadActivityTypeListResult
+        {
+            Data = statuses
+        };
+    }
+
+
+}
+
+
+

Core/Application/Features/LeadContactManager/Commands/CreateLeadContact.cs

@@ -0,0 +1,82 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadContactManager.Commands;
+
+public class CreateLeadContactResult
+{
+    public LeadContact? Data { get; set; }
+}
+
+public class CreateLeadContactRequest : IRequest<CreateLeadContactResult>
+{
+    public string? LeadId { get; init; }
+    public string? FullName { get; init; }
+    public string? Description { get; init; }
+    public string? AddressStreet { get; init; }
+    public string? AddressCity { get; init; }
+    public string? AddressState { get; init; }
+    public string? MobileNumber { get; init; }
+    public string? Email { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateLeadContactValidator : AbstractValidator<CreateLeadContactRequest>
+{
+    public CreateLeadContactValidator()
+    {
+        RuleFor(x => x.LeadId).NotEmpty();
+        RuleFor(x => x.FullName).NotEmpty();
+        RuleFor(x => x.AddressStreet).NotEmpty();
+        RuleFor(x => x.AddressCity).NotEmpty();
+        RuleFor(x => x.AddressState).NotEmpty();
+        RuleFor(x => x.MobileNumber).NotEmpty();
+        RuleFor(x => x.Email).NotEmpty();
+    }
+}
+
+public class CreateLeadContactHandler : IRequestHandler<CreateLeadContactRequest, CreateLeadContactResult>
+{
+    private readonly ICommandRepository<LeadContact> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateLeadContactHandler(
+        ICommandRepository<LeadContact> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateLeadContactResult> Handle(CreateLeadContactRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new LeadContact
+        {
+            CreatedById = request.CreatedById,
+            LeadId = request.LeadId,
+            Number = _numberSequenceService.GenerateNumber(nameof(LeadContact), "", "LC"),
+            FullName = request.FullName,
+            Description = request.Description,
+            AddressStreet = request.AddressStreet,
+            AddressCity = request.AddressCity,
+            AddressState = request.AddressState,
+            MobileNumber = request.MobileNumber,
+            Email = request.Email
+        };
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateLeadContactResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadContactManager/Commands/DeleteLeadContact.cs

@@ -0,0 +1,60 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadContactManager.Commands;
+
+public class DeleteLeadContactResult
+{
+    public LeadContact? Data { get; set; }
+}
+
+public class DeleteLeadContactRequest : IRequest<DeleteLeadContactResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteLeadContactValidator : AbstractValidator<DeleteLeadContactRequest>
+{
+    public DeleteLeadContactValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteLeadContactHandler : IRequestHandler<DeleteLeadContactRequest, DeleteLeadContactResult>
+{
+    private readonly ICommandRepository<LeadContact> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteLeadContactHandler(
+        ICommandRepository<LeadContact> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteLeadContactResult> Handle(DeleteLeadContactRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteLeadContactResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadContactManager/Commands/UpdateLeadContact.cs

@@ -0,0 +1,104 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadContactManager.Commands;
+
+public class UpdateLeadContactResult
+{
+    public LeadContact? Data { get; set; }
+}
+
+public class UpdateLeadContactRequest : IRequest<UpdateLeadContactResult>
+{
+    public string? Id { get; init; }
+    public string? LeadId { get; init; }
+    public string? FullName { get; init; }
+    public string? Description { get; init; }
+    public string? AddressStreet { get; init; }
+    public string? AddressCity { get; init; }
+    public string? AddressState { get; init; }
+    public string? AddressZipCode { get; init; }
+    public string? AddressCountry { get; init; }
+    public string? PhoneNumber { get; init; }
+    public string? FaxNumber { get; init; }
+    public string? MobileNumber { get; init; }
+    public string? Email { get; init; }
+    public string? Website { get; init; }
+    public string? WhatsApp { get; init; }
+    public string? LinkedIn { get; init; }
+    public string? Facebook { get; init; }
+    public string? Twitter { get; init; }
+    public string? Instagram { get; init; }
+    public string? AvatarName { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateLeadContactValidator : AbstractValidator<UpdateLeadContactRequest>
+{
+    public UpdateLeadContactValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.FullName).NotEmpty();
+        RuleFor(x => x.AddressStreet).NotEmpty();
+        RuleFor(x => x.AddressCity).NotEmpty();
+        RuleFor(x => x.AddressState).NotEmpty();
+        RuleFor(x => x.MobileNumber).NotEmpty();
+        RuleFor(x => x.Email).NotEmpty();
+    }
+}
+
+public class UpdateLeadContactHandler : IRequestHandler<UpdateLeadContactRequest, UpdateLeadContactResult>
+{
+    private readonly ICommandRepository<LeadContact> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateLeadContactHandler(
+        ICommandRepository<LeadContact> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateLeadContactResult> Handle(UpdateLeadContactRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+        entity.LeadId = request.LeadId;
+        entity.FullName = request.FullName;
+        entity.Description = request.Description;
+        entity.AddressStreet = request.AddressStreet;
+        entity.AddressCity = request.AddressCity;
+        entity.AddressState = request.AddressState;
+        entity.AddressZipCode = request.AddressZipCode;
+        entity.AddressCountry = request.AddressCountry;
+        entity.PhoneNumber = request.PhoneNumber;
+        entity.FaxNumber = request.FaxNumber;
+        entity.MobileNumber = request.MobileNumber;
+        entity.Email = request.Email;
+        entity.Website = request.Website;
+        entity.WhatsApp = request.WhatsApp;
+        entity.LinkedIn = request.LinkedIn;
+        entity.Facebook = request.Facebook;
+        entity.Twitter = request.Twitter;
+        entity.Instagram = request.Instagram;
+        entity.AvatarName = request.AvatarName;
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateLeadContactResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadContactManager/Queries/GetLeadContactByLeadIdList.cs

@@ -0,0 +1,82 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.LeadContactManager.Queries;
+
+public record GetLeadContactByLeadIdListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? FullName { get; init; }
+    public string? Description { get; init; }
+    public string? AddressStreet { get; init; }
+    public string? AddressCity { get; init; }
+    public string? AddressState { get; init; }
+    public string? AddressZipCode { get; init; }
+    public string? AddressCountry { get; init; }
+    public string? PhoneNumber { get; init; }
+    public string? FaxNumber { get; init; }
+    public string? MobileNumber { get; init; }
+    public string? Email { get; init; }
+    public string? Website { get; init; }
+    public string? WhatsApp { get; init; }
+    public string? LinkedIn { get; init; }
+    public string? Facebook { get; init; }
+    public string? Twitter { get; init; }
+    public string? Instagram { get; init; }
+    public string? AvatarName { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetLeadContactByLeadIdListProfile : Profile
+{
+    public GetLeadContactByLeadIdListProfile()
+    {
+        CreateMap<LeadContact, GetLeadContactByLeadIdListDto>();
+    }
+}
+
+public class GetLeadContactByLeadIdListResult
+{
+    public List<GetLeadContactByLeadIdListDto>? Data { get; init; }
+}
+
+public class GetLeadContactByLeadIdListRequest : IRequest<GetLeadContactByLeadIdListResult>
+{
+    public string? LeadId { get; init; }
+}
+
+public class GetLeadContactByLeadIdListHandler : IRequestHandler<GetLeadContactByLeadIdListRequest, GetLeadContactByLeadIdListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetLeadContactByLeadIdListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetLeadContactByLeadIdListResult> Handle(GetLeadContactByLeadIdListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .LeadContact
+            .AsNoTracking()
+            .IsDeletedEqualTo(false) // Assuming contacts aren't soft-deleted or this method filters out deleted contacts
+            .Where(x => x.LeadId == request.LeadId)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetLeadContactByLeadIdListDto>>(entities);
+
+        return new GetLeadContactByLeadIdListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/LeadContactManager/Queries/GetLeadContactList.cs

@@ -0,0 +1,88 @@
+using Application.Common.CQS.Queries;
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.LeadContactManager.Queries;
+
+public record GetLeadContactListDto
+{
+    public string? Id { get; init; }
+    public string? Number { get; init; }
+    public string? FullName { get; init; }
+    public string? Description { get; init; }
+    public string? AddressStreet { get; init; }
+    public string? AddressCity { get; init; }
+    public string? AddressState { get; init; }
+    public string? AddressZipCode { get; init; }
+    public string? AddressCountry { get; init; }
+    public string? PhoneNumber { get; init; }
+    public string? FaxNumber { get; init; }
+    public string? MobileNumber { get; init; }
+    public string? Email { get; init; }
+    public string? Website { get; init; }
+    public string? WhatsApp { get; init; }
+    public string? LinkedIn { get; init; }
+    public string? Facebook { get; init; }
+    public string? Twitter { get; init; }
+    public string? Instagram { get; init; }
+    public string? AvatarName { get; init; }
+    public string? LeadId { get; init; }
+    public string? LeadTitle { get; init; }
+    public DateTime? CreatedAtUtc { get; init; }
+}
+
+public class GetLeadContactListProfile : Profile
+{
+    public GetLeadContactListProfile()
+    {
+        CreateMap<LeadContact, GetLeadContactListDto>()
+            .ForMember(
+                dest => dest.LeadTitle,
+                opt => opt.MapFrom(src => src.Lead != null ? src.Lead.Title : string.Empty)
+            );
+    }
+}
+
+public class GetLeadContactListResult
+{
+    public List<GetLeadContactListDto>? Data { get; init; }
+}
+
+public class GetLeadContactListRequest : IRequest<GetLeadContactListResult>
+{
+    public bool IsDeleted { get; init; } = false;
+}
+
+public class GetLeadContactListHandler : IRequestHandler<GetLeadContactListRequest, GetLeadContactListResult>
+{
+    private readonly IMapper _mapper;
+    private readonly IQueryContext _context;
+
+    public GetLeadContactListHandler(IMapper mapper, IQueryContext context)
+    {
+        _mapper = mapper;
+        _context = context;
+    }
+
+    public async Task<GetLeadContactListResult> Handle(GetLeadContactListRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .LeadContact
+            .Include(x => x.Lead)
+            .AsNoTracking()
+            .IsDeletedEqualTo(request.IsDeleted)
+            .AsQueryable();
+
+        var entities = await query.ToListAsync(cancellationToken);
+
+        var dtos = _mapper.Map<List<GetLeadContactListDto>>(entities);
+
+        return new GetLeadContactListResult
+        {
+            Data = dtos
+        };
+    }
+}

Core/Application/Features/LeadContactManager/Queries/GetLeadContactSingle.cs

@@ -0,0 +1,61 @@
+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.LeadContactManager.Queries;
+
+public class GetLeadContactSingleProfile : Profile
+{
+    public GetLeadContactSingleProfile()
+    {
+    }
+}
+
+public class GetLeadContactSingleResult
+{
+    public LeadContact? Data { get; init; }
+}
+
+public class GetLeadContactSingleRequest : IRequest<GetLeadContactSingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetLeadContactSingleValidator : AbstractValidator<GetLeadContactSingleRequest>
+{
+    public GetLeadContactSingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetLeadContactSingleHandler : IRequestHandler<GetLeadContactSingleRequest, GetLeadContactSingleResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetLeadContactSingleHandler(
+        IQueryContext context
+    )
+    {
+        _context = context;
+    }
+
+    public async Task<GetLeadContactSingleResult> Handle(GetLeadContactSingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .LeadContact
+            .AsNoTracking()
+            .Where(x => x.Id == request.Id)
+            .AsQueryable();
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        return new GetLeadContactSingleResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadManager/Commands/CreateLead.cs

@@ -0,0 +1,124 @@
+using Application.Common.Repositories;
+using Application.Features.NumberSequenceManager;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadManager.Commands;
+
+public class CreateLeadResult
+{
+    public Lead? Data { get; set; }
+}
+
+public class CreateLeadRequest : IRequest<CreateLeadResult>
+{
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public string? CompanyName { get; init; }
+    public string? CompanyAddressStreet { get; init; }
+    public string? CompanyAddressCity { get; init; }
+    public string? CompanyAddressState { get; init; }
+    public string? CompanyPhoneNumber { get; init; }
+    public string? CompanyEmail { get; init; }
+    public DateTime? DateProspecting { get; init; }
+    public DateTime? DateClosingEstimation { get; init; }
+    public DateTime? DateClosingActual { get; init; }
+    public double? AmountTargeted { get; init; }
+    public double? AmountClosed { get; init; }
+    public double? BudgetScore { get; init; }
+    public double? AuthorityScore { get; init; }
+    public double? NeedScore { get; init; }
+    public double? TimelineScore { get; init; }
+    public string? PipelineStage { get; init; }
+    public string? ClosingStatus { get; init; }
+    public string? CampaignId { get; init; }
+    public string? SalesTeamId { get; init; }
+    public string? CreatedById { get; init; }
+}
+
+public class CreateLeadValidator : AbstractValidator<CreateLeadRequest>
+{
+    public CreateLeadValidator()
+    {
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.SalesTeamId).NotEmpty();
+        RuleFor(x => x.CompanyName).NotEmpty();
+        RuleFor(x => x.CompanyAddressStreet).NotEmpty();
+        RuleFor(x => x.CompanyAddressCity).NotEmpty();
+        RuleFor(x => x.CompanyAddressState).NotEmpty();
+        RuleFor(x => x.CompanyPhoneNumber).NotEmpty();
+        RuleFor(x => x.CompanyEmail).NotEmpty();
+        RuleFor(x => x.DateProspecting).NotNull();
+        RuleFor(x => x.DateClosingEstimation).NotNull();
+        RuleFor(x => x.AmountTargeted).NotNull();
+        RuleFor(x => x.AmountClosed).NotNull();
+        RuleFor(x => x.BudgetScore).NotNull();
+        RuleFor(x => x.AuthorityScore).NotNull();
+        RuleFor(x => x.NeedScore).NotNull();
+        RuleFor(x => x.TimelineScore).NotNull();
+        RuleFor(x => x.PipelineStage).NotEmpty();
+        RuleFor(x => x.CampaignId).NotEmpty();
+    }
+}
+
+public class CreateLeadHandler : IRequestHandler<CreateLeadRequest, CreateLeadResult>
+{
+    private readonly ICommandRepository<Lead> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly NumberSequenceService _numberSequenceService;
+
+    public CreateLeadHandler(
+        ICommandRepository<Lead> repository,
+        IUnitOfWork unitOfWork,
+        NumberSequenceService numberSequenceService
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+        _numberSequenceService = numberSequenceService;
+    }
+
+    public async Task<CreateLeadResult> Handle(CreateLeadRequest request, CancellationToken cancellationToken = default)
+    {
+        var entity = new Lead
+        {
+            CreatedById = request.CreatedById,
+            Number = _numberSequenceService.GenerateNumber(nameof(Lead), "", "LEA"),
+            Title = request.Title,
+            SalesTeamId = request.SalesTeamId,
+            Description = request.Description,
+            CompanyName = request.CompanyName,
+            CompanyAddressStreet = request.CompanyAddressStreet,
+            CompanyAddressCity = request.CompanyAddressCity,
+            CompanyAddressState = request.CompanyAddressState,
+            CompanyPhoneNumber = request.CompanyPhoneNumber,
+            CompanyEmail = request.CompanyEmail,
+            DateProspecting = request.DateProspecting,
+            DateClosingEstimation = request.DateClosingEstimation,
+            DateClosingActual = request.DateClosingActual,
+            AmountTargeted = request.AmountTargeted,
+            AmountClosed = request.AmountClosed,
+            BudgetScore = request.BudgetScore,
+            AuthorityScore = request.AuthorityScore,
+            NeedScore = request.NeedScore,
+            TimelineScore = request.TimelineScore,
+            PipelineStage = (PipelineStage)int.Parse(request.PipelineStage!),
+            CampaignId = request.CampaignId
+        };
+
+        if (!string.IsNullOrEmpty(request.ClosingStatus))
+        {
+            entity.ClosingStatus = (ClosingStatus)int.Parse(request.ClosingStatus!);
+        }
+
+        await _repository.CreateAsync(entity, cancellationToken);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new CreateLeadResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadManager/Commands/DeleteLead.cs

@@ -0,0 +1,60 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadManager.Commands;
+
+public class DeleteLeadResult
+{
+    public Lead? Data { get; set; }
+}
+
+public class DeleteLeadRequest : IRequest<DeleteLeadResult>
+{
+    public string? Id { get; init; }
+    public string? DeletedById { get; init; }
+}
+
+public class DeleteLeadValidator : AbstractValidator<DeleteLeadRequest>
+{
+    public DeleteLeadValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class DeleteLeadHandler : IRequestHandler<DeleteLeadRequest, DeleteLeadResult>
+{
+    private readonly ICommandRepository<Lead> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public DeleteLeadHandler(
+        ICommandRepository<Lead> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<DeleteLeadResult> Handle(DeleteLeadRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.DeletedById;
+
+        _repository.Delete(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new DeleteLeadResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadManager/Commands/UpdateLead.cs

@@ -0,0 +1,125 @@
+using Application.Common.Repositories;
+using Domain.Entities;
+using Domain.Enums;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.LeadManager.Commands;
+
+public class UpdateLeadResult
+{
+    public Lead? Data { get; set; }
+}
+
+public class UpdateLeadRequest : IRequest<UpdateLeadResult>
+{
+    public string? Id { get; init; }
+    public string? Title { get; init; }
+    public string? Description { get; init; }
+    public string? CompanyName { get; init; }
+    public string? CompanyAddressStreet { get; init; }
+    public string? CompanyAddressCity { get; init; }
+    public string? CompanyAddressState { get; init; }
+    public string? CompanyPhoneNumber { get; init; }
+    public string? CompanyEmail { get; init; }
+    public DateTime? DateProspecting { get; init; }
+    public DateTime? DateClosingEstimation { get; init; }
+    public DateTime? DateClosingActual { get; init; }
+    public double? AmountTargeted { get; init; }
+    public double? AmountClosed { get; init; }
+    public double? BudgetScore { get; init; }
+    public double? AuthorityScore { get; init; }
+    public double? NeedScore { get; init; }
+    public double? TimelineScore { get; init; }
+    public string? PipelineStage { get; init; }
+    public string? ClosingStatus { get; init; }
+    public string? CampaignId { get; init; }
+    public string? SalesTeamId { get; init; }
+    public string? UpdatedById { get; init; }
+}
+
+public class UpdateLeadValidator : AbstractValidator<UpdateLeadRequest>
+{
+    public UpdateLeadValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+        RuleFor(x => x.Title).NotEmpty();
+        RuleFor(x => x.SalesTeamId).NotEmpty();
+        RuleFor(x => x.CompanyName).NotEmpty();
+        RuleFor(x => x.CompanyAddressStreet).NotEmpty();
+        RuleFor(x => x.CompanyAddressCity).NotEmpty();
+        RuleFor(x => x.CompanyAddressState).NotEmpty();
+        RuleFor(x => x.CompanyPhoneNumber).NotEmpty();
+        RuleFor(x => x.CompanyEmail).NotEmpty();
+        RuleFor(x => x.DateProspecting).NotNull();
+        RuleFor(x => x.DateClosingEstimation).NotNull();
+        RuleFor(x => x.AmountTargeted).NotNull();
+        RuleFor(x => x.AmountClosed).NotNull();
+        RuleFor(x => x.BudgetScore).NotNull();
+        RuleFor(x => x.AuthorityScore).NotNull();
+        RuleFor(x => x.NeedScore).NotNull();
+        RuleFor(x => x.TimelineScore).NotNull();
+        RuleFor(x => x.PipelineStage).NotEmpty();
+        RuleFor(x => x.CampaignId).NotEmpty();
+    }
+}
+
+public class UpdateLeadHandler : IRequestHandler<UpdateLeadRequest, UpdateLeadResult>
+{
+    private readonly ICommandRepository<Lead> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public UpdateLeadHandler(
+        ICommandRepository<Lead> repository,
+        IUnitOfWork unitOfWork
+    )
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<UpdateLeadResult> Handle(UpdateLeadRequest request, CancellationToken cancellationToken)
+    {
+        var entity = await _repository.GetAsync(request.Id ?? string.Empty, cancellationToken);
+
+        if (entity == null)
+        {
+            throw new Exception($"Entity not found: {request.Id}");
+        }
+
+        entity.UpdatedById = request.UpdatedById;
+        entity.Title = request.Title;
+        entity.SalesTeamId = request.SalesTeamId;
+        entity.Description = request.Description;
+        entity.CompanyName = request.CompanyName;
+        entity.CompanyAddressStreet = request.CompanyAddressStreet;
+        entity.CompanyAddressCity = request.CompanyAddressCity;
+        entity.CompanyAddressState = request.CompanyAddressState;
+        entity.CompanyPhoneNumber = request.CompanyPhoneNumber;
+        entity.CompanyEmail = request.CompanyEmail;
+        entity.DateProspecting = request.DateProspecting;
+        entity.DateClosingEstimation = request.DateClosingEstimation;
+        entity.DateClosingActual = request.DateClosingActual;
+        entity.AmountTargeted = request.AmountTargeted;
+        entity.AmountClosed = request.AmountClosed;
+        entity.BudgetScore = request.BudgetScore;
+        entity.AuthorityScore = request.AuthorityScore;
+        entity.NeedScore = request.NeedScore;
+        entity.TimelineScore = request.TimelineScore;
+        entity.PipelineStage = (PipelineStage)int.Parse(request.PipelineStage!);
+        entity.CampaignId = request.CampaignId;
+
+        if (!string.IsNullOrEmpty(request.ClosingStatus))
+        {
+            entity.ClosingStatus = (ClosingStatus)int.Parse(request.ClosingStatus!);
+        }
+
+        _repository.Update(entity);
+        await _unitOfWork.SaveAsync(cancellationToken);
+
+        return new UpdateLeadResult
+        {
+            Data = entity
+        };
+    }
+}

Core/Application/Features/LeadManager/Queries/GetClosingStatusList.cs

@@ -0,0 +1,54 @@
+using Application.Common.Extensions;
+using AutoMapper;
+using Domain.Enums;
+using MediatR;
+
+namespace Application.Features.CampaignManager.Queries;
+
+public record GetClosingStatusListDto
+{
+    public string? Id { get; init; }
+    public string? Name { get; init; }
+}
+
+public class GetClosingStatusListProfile : Profile
+{
+    public GetClosingStatusListProfile()
+    {
+    }
+}
+
+public class GetClosingStatusListResult
+{
+    public List<GetClosingStatusListDto>? Data { get; init; }
+}
+
+public class GetClosingStatusListRequest : IRequest<GetClosingStatusListResult>
+{
+}
+
+public class GetClosingStatusListHandler : IRequestHandler<GetClosingStatusListRequest, GetClosingStatusListResult>
+{
+    public GetClosingStatusListHandler()
+    {
+    }
+
+    public async Task<GetClosingStatusListResult> Handle(GetClosingStatusListRequest request, CancellationToken cancellationToken)
+    {
+        var statuses = Enum.GetValues(typeof(ClosingStatus))
+            .Cast<ClosingStatus>()
+            .Select(status => new GetClosingStatusListDto
+            {
+                Id = ((int)status).ToString(),
+                Name = status.ToFriendlyName()
+            })
+            .ToList();
+
+        await Task.CompletedTask;
+
+        return new GetClosingStatusListResult
+        {
+            Data = statuses
+        };
+    }
+}