Create models and Clean Arch boilerplate

CSR.Infrastructure/Persistence/CSRDbContext.cs

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+namespace CSR.Infrastructure.Persistence;
+
+using Microsoft.EntityFrameworkCore;
+using CSR.Infrastructure.Persistence.Configurations;
+
+
+public class CSRDbContext(DbContextOptions<CSRDbContext> options) : DbContext(options)
+{
+  public DbSet<User> Users { get; set; }
+  public DbSet<Role> Roles { get; set; }
+
+  protected override void OnModelCreating(ModelBuilder modelBuilder)
+  {
+    modelBuilder.ApplyConfiguration(new UserConfiguration());
+    modelBuilder.ApplyConfiguration(new RoleConfiguration());
+
+    modelBuilder.Entity<User>()
+        .HasIndex(u => u.Username)
+        .IsUnique();
+
+    modelBuilder.Entity<User>()
+        .HasOne(u => u.Role)
+        .WithMany(r => r.Users)
+        .HasForeignKey(u => u.RoleId);
+
+    // --- Seed data --- //
+
+    var adminRole = new Role { Id = 1, Name = "Admin" };
+    var userRole = new Role { Id = 2, Name = "User" };
+
+    modelBuilder.Entity<Role>()
+        .HasData(adminRole, userRole);
+
+
+    base.OnModelCreating(modelBuilder);
+  }
+}