first commit

services/csharp/example/Infrastructure/AppDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using SequenceAuth.Example.Domain;
+
+namespace SequenceAuth.Example.Infrastructure;
+
+public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
+{
+    public DbSet<User> Users => Set<User>();
+    public DbSet<TodoItem> Todos => Set<TodoItem>();
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<User>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Username).IsRequired();
+            entity.HasIndex(e => e.Username).IsUnique();
+        });
+
+        modelBuilder.Entity<TodoItem>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Title).IsRequired();
+            entity.Property(e => e.Status).HasConversion<string>();
+        });
+    }
+}