Merge branch 'dev'

Improves repository structure by introducing a generic DbCrud class and dedicated repositories for each entity.

This change enhances code maintainability and testability by separating concerns.
It also introduces soft delete functionality to the generic repository.

LiquidCode/Api/Authentication/Requests/LoginRequest.cs

@@ -3,4 +3,9 @@ namespace LiquidCode.Api.Authentication.Requests;
 /// <summary>
 /// Модель запроса для входа пользователя
 /// </summary>
-public record LoginRequest(string Username, string Password);
+/// <param name="Username">Имя пользователя</param>
+/// <param name="Password">Пароль</param>
+public record LoginRequest(
+    string Username,
+    string Password
+    );

LiquidCode/Domain/Interfaces/Repositories/IMissionRepository.cs

@@ -7,15 +7,6 @@ namespace LiquidCode.Domain.Interfaces.Repositories;
 /// </summary>
 public interface IMissionRepository : IRepository<DbMission>
 {
-    /// <summary>
-    /// Получает миссии с пагинацией
-    /// </summary>
-    /// <param name="pageSize">Количество элементов на странице</param>
-    /// <param name="pageNumber">Номер страницы (начиная с нуля)</param>
-    /// <param name="cancellationToken">Токен отмены</param>
-    /// <returns>Кортеж (миссии, естьСледующаяСтраница)</returns>
-    Task<(IEnumerable<DbMission> Missions, bool HasNextPage)> GetMissionsPageAsync(
-        int pageSize, int pageNumber, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Получает миссии по автору
@@ -35,12 +26,12 @@ public interface IMissionRepository : IRepository<DbMission>
     /// <summary>
     /// Добавляет текстовые данные миссии
     /// </summary>
-    Task AddMissionTextAsync(DbMissionPublicTextData textData, CancellationToken cancellationToken = default);
+    Task CreateMissionTextAsync(DbMissionPublicTextData textData, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Добавляет несколько записей текстовых данных миссии
     /// </summary>
-    Task AddMissionTextsAsync(IEnumerable<DbMissionPublicTextData> textData, CancellationToken cancellationToken = default);
+    Task CreateMissionTextsAsync(IEnumerable<DbMissionPublicTextData> textData, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Подсчитывает общее количество миссий

LiquidCode/Domain/Interfaces/Repositories/IRepository.cs

@@ -1,10 +1,12 @@
+using LiquidCode.Infrastructure.Database.Entities;
+
 namespace LiquidCode.Domain.Interfaces.Repositories;
 
 /// <summary>
 /// Базовый интерфейс репозитория для общих операций CRUD
 /// </summary>
 /// <typeparam name="TEntity">Тип сущности, управляемой этим репозиторием</typeparam>
-public interface IRepository<TEntity> where TEntity : class
+public interface IRepository<TEntity> where TEntity : class, ISoftDeletable
 {
     /// <summary>
     /// Находит сущность по ее ID
@@ -12,14 +14,19 @@ public interface IRepository<TEntity> where TEntity : class
     Task<TEntity?> FindByIdAsync(int id, CancellationToken cancellationToken = default);
 
     /// <summary>
-    /// Получает все сущности
+    /// Получает все сущности с пагинацией
     /// </summary>
-    Task<IEnumerable<TEntity>> GetAllAsync(CancellationToken cancellationToken = default);
+    /// <param name="pageSize">Количество элементов на странице</param>
+    /// <param name="pageNumber">Номер страницы (начиная с 0)</param>
+    /// <param name="cancellationToken">Токен отмены</param>
+    /// <returns>Кортеж (сущности, естьСледующаяСтраница)</returns>
+    Task<(IEnumerable<TEntity> Items, bool HasNextPage)> GetPageAsync(
+        int pageSize, int pageNumber, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Добавляет новую сущность
     /// </summary>
-    Task AddAsync(TEntity entity, CancellationToken cancellationToken = default);
+    Task CreateAsync(TEntity entity, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Обновляет существующую сущность
@@ -29,7 +36,12 @@ public interface IRepository<TEntity> where TEntity : class
     /// <summary>
     /// Удаляет сущность
     /// </summary>
-    Task RemoveAsync(TEntity entity, CancellationToken cancellationToken = default);
+    Task DeleteAsync(TEntity entity, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Мягко удаляет сущность
+    /// </summary>
+    Task SoftDeleteAsync(TEntity entity, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Сохраняет все изменения, сделанные в базе данных

LiquidCode/Domain/Interfaces/Repositories/ISubmitRepository.cs

@@ -23,12 +23,12 @@ public interface ISubmitRepository : IRepository<DbUserSubmit>
     Task<DbUserSubmit?> GetSubmissionWithDetailsAsync(int submissionId, CancellationToken cancellationToken = default);
 
     /// <summary>
-    /// Получает решение для отправки
+    /// Получает решение
     /// </summary>
     Task<DbSolution?> GetSolutionAsync(int submissionId, CancellationToken cancellationToken = default);
 
     /// <summary>
-    /// Добавляет решение для отправки
+    /// Добавляет решение
     /// </summary>
     Task AddSolutionAsync(DbSolution solution, CancellationToken cancellationToken = default);
 }

LiquidCode/Domain/Services/Authentication/AuthenticationService.cs

@@ -55,7 +55,7 @@ public class AuthenticationService : IAuthenticationService
                 Salt = "" // BCrypt управляет солью внутренне
             };
 
-            await _userRepository.AddAsync(newUser, cancellationToken);
+            await _userRepository.CreateAsync(newUser, cancellationToken);
             _logger.LogInformation("User registered successfully: {Username}", request.Username);
 
             // Автоматически войти пользователю

LiquidCode/Domain/Services/Missions/MissionService.cs

@@ -83,7 +83,7 @@ public class MissionService : IMissionService
                 UpdatedAt = DateTime.UtcNow
             };
 
-            await _missionRepository.AddAsync(dbMission, cancellationToken);
+            await _missionRepository.CreateAsync(dbMission, cancellationToken);
 
             // Распарсить и сохранить текстовые данные миссии
             var missionTexts = ExtractMissionTexts(statementSectionsPath, dbMission.Id);
@@ -104,7 +104,7 @@ public class MissionService : IMissionService
             }
 
             // Добавить текстовые данные миссии в базу данных
-            await _missionRepository.AddMissionTextsAsync(missionTexts, cancellationToken);
+            await _missionRepository.CreateMissionTextsAsync(missionTexts, cancellationToken);
             await _missionRepository.SaveChangesAsync(cancellationToken);
 
             _logger.LogInformation("Mission uploaded successfully: {MissionId}", dbMission.Id);
@@ -159,7 +159,7 @@ public class MissionService : IMissionService
                 return null;
             }
 
-            var (missions, hasNextPage) = await _missionRepository.GetMissionsPageAsync(pageSize, pageNumber, cancellationToken);
+            var (missions, hasNextPage) = await _missionRepository.GetPageAsync(pageSize, pageNumber, cancellationToken);
             var apiList = missions.Select(MissionResponse.FromEntity);
 
             return new MissionsPageResponse(hasNextPage, apiList);

LiquidCode/Domain/Services/Submits/SubmitService.cs

@@ -72,7 +72,7 @@ public class SubmitService : ISubmitService
                 Solution = solution
             };
 
-            await _submitRepository.AddAsync(submission, cancellationToken);
+            await _submitRepository.CreateAsync(submission, cancellationToken);
             _logger.LogInformation("Solution submitted: UserId={UserId}, MissionId={MissionId}, SolutionId={SolutionId}", userId, missionId, solution.Id);
 
             return solution;

LiquidCode/Infrastructure/Database/Repositories/DbCrud.cs

@@ -0,0 +1,70 @@
+using LiquidCode.Domain.Interfaces.Repositories;
+using LiquidCode.Infrastructure.Database;
+using LiquidCode.Infrastructure.Database.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace LiquidCode.Infrastructure.Database.Repositories;
+
+/// <summary>
+/// Базовая реализация репозитория, предоставляющая общие операции CRUD
+/// </summary>
+public class DbCrud<TEntity> : IRepository<TEntity> where TEntity : class, ISoftDeletable
+{
+    private readonly LiquidDbContext _dbContext;
+    public readonly DbSet<TEntity> DbSet;
+
+    public DbCrud(LiquidDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        DbSet = dbContext.Set<TEntity>();
+    }
+
+    public virtual async Task<TEntity?> FindByIdAsync(int id, CancellationToken cancellationToken = default) =>
+        await DbSet.FindAsync(new object?[] { id }, cancellationToken);
+
+    public virtual async Task<(IEnumerable<TEntity> Items, bool HasNextPage)> GetPageAsync(
+        int pageSize, int pageNumber, CancellationToken cancellationToken = default)
+    {
+        if (pageSize <= 0 || pageNumber < 0)
+            throw new ArgumentException("Page size must be positive, page number must be non-negative");
+
+        var totalCount = await DbSet.CountAsync(cancellationToken);
+        var hasNextPage = totalCount > pageSize * (pageNumber + 1);
+
+        var items = await DbSet
+            .OrderBy(x => EF.Property<int>(x, "Id"))
+            .Skip(pageSize * pageNumber)
+            .Take(pageSize)
+            .ToListAsync(cancellationToken);
+
+        return (items, hasNextPage);
+    }
+
+    public virtual async Task CreateAsync(TEntity entity, CancellationToken cancellationToken = default)
+    {
+        await DbSet.AddAsync(entity, cancellationToken);
+        await SaveChangesAsync(cancellationToken);
+    }
+
+    public virtual async Task UpdateAsync(TEntity entity, CancellationToken cancellationToken = default)
+    {
+        DbSet.Update(entity);
+        await SaveChangesAsync(cancellationToken);
+    }
+
+    public virtual async Task DeleteAsync(TEntity entity, CancellationToken cancellationToken = default)
+    {
+        DbSet.Remove(entity);
+        await SaveChangesAsync(cancellationToken);
+    }
+
+    public virtual async Task SoftDeleteAsync(TEntity entity, CancellationToken cancellationToken = default)
+    {
+        entity.IsDeleted = true;
+        DbSet.Update(entity);
+        await SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task SaveChangesAsync(CancellationToken cancellationToken = default) =>
+        await _dbContext.SaveChangesAsync(cancellationToken);
+}

LiquidCode/Infrastructure/Database/Repositories/MissionRepository.cs

@@ -8,52 +8,63 @@ namespace LiquidCode.Infrastructure.Database.Repositories;
 /// <summary>
 /// Реализация репозитория для операций с базой данных, связанных с миссиями
 /// </summary>
-public class MissionRepository : Repository<DbMission>, IMissionRepository
+public class MissionRepository : IMissionRepository
 {
-    public MissionRepository(LiquidDbContext dbContext) : base(dbContext)
+    private readonly LiquidDbContext _dbContext;
+    private readonly DbCrud<DbMission> _missionRepository;
+
+    public MissionRepository(LiquidDbContext dbContext)
     {
+        _dbContext = dbContext;
+        _missionRepository = new DbCrud<DbMission>(dbContext);
     }
 
-    public async Task<(IEnumerable<DbMission> Missions, bool HasNextPage)> GetMissionsPageAsync(
-        int pageSize, int pageNumber, CancellationToken cancellationToken = default)
-    {
-        if (pageSize <= 0 || pageNumber < 0)
-            throw new ArgumentException("Page size must be positive, page number must be non-negative");
+    // IRepository<DbMission> implementation (delegated to _missionRepository)
+    public Task<DbMission?> FindByIdAsync(int id, CancellationToken cancellationToken = default) =>
+        _missionRepository.FindByIdAsync(id, cancellationToken);
 
-        var totalCount = await DbSet.CountAsync(cancellationToken);
-        var hasNextPage = totalCount > pageSize * (pageNumber + 1);
+    public Task<(IEnumerable<DbMission> Items, bool HasNextPage)> GetPageAsync(
+        int pageSize, int pageNumber, CancellationToken cancellationToken = default) =>
+        _missionRepository.GetPageAsync(pageSize, pageNumber, cancellationToken);
 
-        var missions = await DbSet
-            .OrderBy(m => m.Id)
-            .Skip(pageSize * pageNumber)
-            .Take(pageSize)
-            .ToListAsync(cancellationToken);
+    public Task CreateAsync(DbMission entity, CancellationToken cancellationToken = default) =>
+        _missionRepository.CreateAsync(entity, cancellationToken);
 
-        return (missions, hasNextPage);
-    }
+    public Task UpdateAsync(DbMission entity, CancellationToken cancellationToken = default) =>
+        _missionRepository.UpdateAsync(entity, cancellationToken);
 
+    public Task DeleteAsync(DbMission entity, CancellationToken cancellationToken = default) =>
+        _missionRepository.DeleteAsync(entity, cancellationToken);
+
+    public Task SoftDeleteAsync(DbMission entity, CancellationToken cancellationToken = default) =>
+        _missionRepository.SoftDeleteAsync(entity, cancellationToken);
+
+    public Task SaveChangesAsync(CancellationToken cancellationToken = default) =>
+        _missionRepository.SaveChangesAsync(cancellationToken);
+
+    // IMissionRepository specific methods
     public async Task<IEnumerable<DbMission>> GetMissionsByAuthorAsync(int authorId, CancellationToken cancellationToken = default) =>
-        await DbSet
+        await _dbContext.Set<DbMission>()
             .Where(m => m.Author.Id == authorId)
             .OrderByDescending(m => m.CreatedAt)
             .ToListAsync(cancellationToken);
 
     public async Task<DbMissionPublicTextData?> GetMissionTextAsync(int missionId, string language, CancellationToken cancellationToken = default) =>
-        await DbContext.MissionsTextData
+        await _dbContext.MissionsTextData
             .FirstOrDefaultAsync(m => m.MissionId == missionId && m.Language == language, cancellationToken);
 
     public async Task<IEnumerable<string>> GetMissionLanguagesAsync(int missionId, CancellationToken cancellationToken = default) =>
-        await DbContext.MissionsTextData
+        await _dbContext.MissionsTextData
             .Where(m => m.MissionId == missionId)
             .Select(m => m.Language)
             .ToListAsync(cancellationToken);
 
-    public async Task AddMissionTextAsync(DbMissionPublicTextData textData, CancellationToken cancellationToken = default) =>
-        await DbContext.MissionsTextData.AddAsync(textData, cancellationToken);
+    public async Task CreateMissionTextAsync(DbMissionPublicTextData textData, CancellationToken cancellationToken = default) =>
+        await _dbContext.MissionsTextData.AddAsync(textData, cancellationToken);
 
-    public async Task AddMissionTextsAsync(IEnumerable<DbMissionPublicTextData> textData, CancellationToken cancellationToken = default) =>
-        await DbContext.MissionsTextData.AddRangeAsync(textData, cancellationToken);
+    public async Task CreateMissionTextsAsync(IEnumerable<DbMissionPublicTextData> textData, CancellationToken cancellationToken = default) =>
+        await _dbContext.MissionsTextData.AddRangeAsync(textData, cancellationToken);
 
     public async Task<int> CountMissionsAsync(CancellationToken cancellationToken = default) =>
-        await DbSet.CountAsync(cancellationToken);
+        await _dbContext.Set<DbMission>().CountAsync(cancellationToken);
 }

LiquidCode/Infrastructure/Database/Repositories/Repository.cs

@@ -1,47 +0,0 @@
-using LiquidCode.Domain.Interfaces.Repositories;
-using LiquidCode.Infrastructure.Database;
-using Microsoft.EntityFrameworkCore;
-
-namespace LiquidCode.Infrastructure.Database.Repositories;
-
-/// <summary>
-/// Базовая реализация репозитория, предоставляющая общие операции CRUD
-/// </summary>
-public class Repository<TEntity> : IRepository<TEntity> where TEntity : class
-{
-    protected readonly LiquidDbContext DbContext;
-    protected readonly DbSet<TEntity> DbSet;
-
-    public Repository(LiquidDbContext dbContext)
-    {
-        DbContext = dbContext;
-        DbSet = dbContext.Set<TEntity>();
-    }
-
-    public virtual async Task<TEntity?> FindByIdAsync(int id, CancellationToken cancellationToken = default) =>
-        await DbSet.FindAsync(new object?[] { id }, cancellationToken);
-
-    public virtual async Task<IEnumerable<TEntity>> GetAllAsync(CancellationToken cancellationToken = default) =>
-        await DbSet.ToListAsync(cancellationToken);
-
-    public virtual async Task AddAsync(TEntity entity, CancellationToken cancellationToken = default)
-    {
-        await DbSet.AddAsync(entity, cancellationToken);
-        await SaveChangesAsync(cancellationToken);
-    }
-
-    public virtual async Task UpdateAsync(TEntity entity, CancellationToken cancellationToken = default)
-    {
-        DbSet.Update(entity);
-        await SaveChangesAsync(cancellationToken);
-    }
-
-    public virtual async Task RemoveAsync(TEntity entity, CancellationToken cancellationToken = default)
-    {
-        DbSet.Remove(entity);
-        await SaveChangesAsync(cancellationToken);
-    }
-
-    public async Task SaveChangesAsync(CancellationToken cancellationToken = default) =>
-        await DbContext.SaveChangesAsync(cancellationToken);
-}

LiquidCode/Infrastructure/Database/Repositories/SubmitRepository.cs

@@ -8,34 +8,63 @@ namespace LiquidCode.Infrastructure.Database.Repositories;
 /// <summary>
 /// Реализация репозитория для операций с базой данных, связанных с отправками пользователей
 /// </summary>
-public class SubmitRepository : Repository<DbUserSubmit>, ISubmitRepository
+public class SubmitRepository : ISubmitRepository
 {
-    public SubmitRepository(LiquidDbContext dbContext) : base(dbContext)
+    private readonly LiquidDbContext _dbContext;
+    private readonly DbCrud<DbUserSubmit> _submitRepository;
+
+    public SubmitRepository(LiquidDbContext dbContext)
     {
+        _dbContext = dbContext;
+        _submitRepository = new DbCrud<DbUserSubmit>(dbContext);
     }
 
+    // IRepository<DbUserSubmit> implementation (delegated to _submitRepository)
+    public Task<DbUserSubmit?> FindByIdAsync(int id, CancellationToken cancellationToken = default) =>
+        _submitRepository.FindByIdAsync(id, cancellationToken);
+
+    public Task<(IEnumerable<DbUserSubmit> Items, bool HasNextPage)> GetPageAsync(
+        int pageSize, int pageNumber, CancellationToken cancellationToken = default) =>
+        _submitRepository.GetPageAsync(pageSize, pageNumber, cancellationToken);
+
+    public Task CreateAsync(DbUserSubmit entity, CancellationToken cancellationToken = default) =>
+        _submitRepository.CreateAsync(entity, cancellationToken);
+
+    public Task UpdateAsync(DbUserSubmit entity, CancellationToken cancellationToken = default) =>
+        _submitRepository.UpdateAsync(entity, cancellationToken);
+
+    public Task DeleteAsync(DbUserSubmit entity, CancellationToken cancellationToken = default) =>
+        _submitRepository.DeleteAsync(entity, cancellationToken);
+
+    public Task SoftDeleteAsync(DbUserSubmit entity, CancellationToken cancellationToken = default) =>
+        _submitRepository.SoftDeleteAsync(entity, cancellationToken);
+
+    public Task SaveChangesAsync(CancellationToken cancellationToken = default) =>
+        _submitRepository.SaveChangesAsync(cancellationToken);
+
+    // ISubmitRepository specific methods
     public async Task<IEnumerable<DbUserSubmit>> GetSubmissionsByUserAsync(int userId, CancellationToken cancellationToken = default) =>
-        await DbSet
+        await _dbContext.Set<DbUserSubmit>()
             .Where(s => s.User.Id == userId)
             .OrderByDescending(s => s.Solution!.Time)
             .ToListAsync(cancellationToken);
 
     public async Task<IEnumerable<DbUserSubmit>> GetSubmissionsByMissionAsync(int missionId, CancellationToken cancellationToken = default) =>
-        await DbSet
+        await _dbContext.Set<DbUserSubmit>()
             .Where(s => s.Solution!.Mission.Id == missionId)
             .OrderByDescending(s => s.Solution!.Time)
             .ToListAsync(cancellationToken);
 
     public async Task<DbUserSubmit?> GetSubmissionWithDetailsAsync(int submissionId, CancellationToken cancellationToken = default) =>
-        await DbSet
+        await _dbContext.Set<DbUserSubmit>()
             .Include(s => s.User)
             .Include(s => s.Solution)
             .FirstOrDefaultAsync(s => s.Id == submissionId, cancellationToken);
 
     public async Task<DbSolution?> GetSolutionAsync(int solutionId, CancellationToken cancellationToken = default) =>
-        await DbContext.Solutions
+        await _dbContext.Solutions
             .FirstOrDefaultAsync(s => s.Id == solutionId, cancellationToken);
 
     public async Task AddSolutionAsync(DbSolution solution, CancellationToken cancellationToken = default) =>
-        await DbContext.Solutions.AddAsync(solution, cancellationToken);
+        await _dbContext.Solutions.AddAsync(solution, cancellationToken);
 }

LiquidCode/Infrastructure/Database/Repositories/UserRepository.cs

@@ -8,39 +8,68 @@ namespace LiquidCode.Infrastructure.Database.Repositories;
 /// <summary>
 /// Реализация репозитория для операций с базой данных, связанных с пользователями
 /// </summary>
-public class UserRepository : Repository<DbUser>, IUserRepository
+public class UserRepository : IUserRepository
 {
-    public UserRepository(LiquidDbContext dbContext) : base(dbContext)
+    private readonly LiquidDbContext _dbContext;
+    private readonly DbCrud<DbUser> _userRepository;
+
+    public UserRepository(LiquidDbContext dbContext)
     {
+        _dbContext = dbContext;
+        _userRepository = new DbCrud<DbUser>(dbContext);
     }
 
+    // IRepository<DbUser> implementation (delegated to _userRepository)
+    public Task<DbUser?> FindByIdAsync(int id, CancellationToken cancellationToken = default) =>
+        _userRepository.FindByIdAsync(id, cancellationToken);
+
+    public Task<(IEnumerable<DbUser> Items, bool HasNextPage)> GetPageAsync(
+        int pageSize, int pageNumber, CancellationToken cancellationToken = default) =>
+        _userRepository.GetPageAsync(pageSize, pageNumber, cancellationToken);
+
+    public Task CreateAsync(DbUser entity, CancellationToken cancellationToken = default) =>
+        _userRepository.CreateAsync(entity, cancellationToken);
+
+    public Task UpdateAsync(DbUser entity, CancellationToken cancellationToken = default) =>
+        _userRepository.UpdateAsync(entity, cancellationToken);
+
+    public Task DeleteAsync(DbUser entity, CancellationToken cancellationToken = default) =>
+        _userRepository.DeleteAsync(entity, cancellationToken);
+
+    public Task SoftDeleteAsync(DbUser entity, CancellationToken cancellationToken = default) =>
+        _userRepository.SoftDeleteAsync(entity, cancellationToken);
+
+    public Task SaveChangesAsync(CancellationToken cancellationToken = default) =>
+        _userRepository.SaveChangesAsync(cancellationToken);
+
+    // IUserRepository specific methods
     public async Task<DbUser?> FindByUsernameAsync(string username, CancellationToken cancellationToken = default) =>
-        await DbSet.FirstOrDefaultAsync(u => u.Username == username, cancellationToken);
+        await _dbContext.Users.FirstOrDefaultAsync(u => u.Username == username, cancellationToken);
 
     public async Task<bool> UserExistsAsync(string username, CancellationToken cancellationToken = default) =>
-        await DbSet.AnyAsync(u => u.Username == username, cancellationToken);
+        await _dbContext.Users.AnyAsync(u => u.Username == username, cancellationToken);
 
     public async Task<int> GetRefreshTokenCountAsync(int userId, CancellationToken cancellationToken = default) =>
-        await DbContext.RefreshTokens.CountAsync(t => t.DbUser.Id == userId, cancellationToken);
+        await _dbContext.RefreshTokens.CountAsync(t => t.DbUser.Id == userId, cancellationToken);
 
     public async Task<DbRefreshToken?> GetOldestRefreshTokenAsync(int userId, CancellationToken cancellationToken = default) =>
-        await DbContext.RefreshTokens
+        await _dbContext.RefreshTokens
             .Where(t => t.DbUser.Id == userId)
             .OrderBy(t => t.Expires)
             .FirstOrDefaultAsync(cancellationToken);
 
     public async Task AddRefreshTokenAsync(DbRefreshToken token, CancellationToken cancellationToken = default) =>
-        await DbContext.RefreshTokens.AddAsync(token, cancellationToken);
+        await _dbContext.RefreshTokens.AddAsync(token, cancellationToken);
 
     public async Task RemoveRefreshTokenAsync(string tokenString, CancellationToken cancellationToken = default)
     {
-        var token = await DbContext.RefreshTokens.FirstOrDefaultAsync(t => t.Token == tokenString, cancellationToken);
+        var token = await _dbContext.RefreshTokens.FirstOrDefaultAsync(t => t.Token == tokenString, cancellationToken);
         if (token != null)
-            DbContext.RefreshTokens.Remove(token);
+            _dbContext.RefreshTokens.Remove(token);
     }
 
     public async Task<DbRefreshToken?> FindRefreshTokenAsync(string tokenString, CancellationToken cancellationToken = default) =>
-        await DbContext.RefreshTokens
+        await _dbContext.RefreshTokens
             .Include(t => t.DbUser)
             .FirstOrDefaultAsync(t => t.Token == tokenString, cancellationToken);
 }