Add initial implementation of API, database, and user management components.

MikrocopDb/Repositories/UserRepository.cs

@@ -0,0 +1,47 @@
+using Microsoft.EntityFrameworkCore;
+using MikrocopDb.Entities;
+
+namespace MikrocopDb.Repositories;
+
+public sealed class UserRepository : IUserRepository
+{
+    private readonly AppDbContext _dbContext;
+
+    public UserRepository(AppDbContext dbContext)
+    {
+        _dbContext = dbContext;
+    }
+
+    public Task<UserEntity?> GetByIdAsync(Guid id, CancellationToken cancellationToken = default)
+    {
+        return _dbContext.Users.FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
+    }
+
+    public Task<UserEntity?> GetByUserNameAsync(string userName, CancellationToken cancellationToken = default)
+    {
+        return _dbContext.Users.FirstOrDefaultAsync(x => x.UserName == userName, cancellationToken);
+    }
+
+    public Task<UserEntity?> GetByEmailAsync(string email, CancellationToken cancellationToken = default)
+    {
+        return _dbContext.Users.FirstOrDefaultAsync(x => x.Email == email, cancellationToken);
+    }
+
+    public async Task AddAsync(UserEntity user, CancellationToken cancellationToken = default)
+    {
+        await _dbContext.Users.AddAsync(user, cancellationToken);
+        await _dbContext.SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task UpdateAsync(UserEntity user, CancellationToken cancellationToken = default)
+    {
+        _dbContext.Users.Update(user);
+        await _dbContext.SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task DeleteAsync(UserEntity user, CancellationToken cancellationToken = default)
+    {
+        _dbContext.Users.Remove(user);
+        await _dbContext.SaveChangesAsync(cancellationToken);
+    }
+}