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samples/SampleWebApi/Data/SampleDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using SampleWebApi.Models;
+
+namespace SampleWebApi.Data;
+
+public class SampleDbContext : DbContext
+{
+    public SampleDbContext(DbContextOptions<SampleDbContext> options) : base(options)
+    {
+    }
+
+    public DbSet<Product> Products { get; set; } = null!;
+    public DbSet<Order> Orders { get; set; } = null!;
+    public DbSet<OrderItem> OrderItems { get; set; } = null!;
+    public DbSet<Customer> Customers { get; set; } = null!;
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        // Product configuration
+        modelBuilder.Entity<Product>(entity =>
+        {
+            entity.HasKey(p => p.Id);
+            entity.Property(p => p.Name).IsRequired().HasMaxLength(200);
+            entity.Property(p => p.Category).IsRequired().HasMaxLength(100);
+            entity.Property(p => p.Price).HasPrecision(10, 2);
+            entity.HasIndex(p => p.Category);
+            entity.HasIndex(p => p.Price);
+        });
+
+        // Order configuration
+        modelBuilder.Entity<Order>(entity =>
+        {
+            entity.HasKey(o => o.Id);
+            entity.Property(o => o.CustomerId).IsRequired().HasMaxLength(50);
+            entity.Property(o => o.TotalAmount).HasPrecision(10, 2);
+            entity.HasIndex(o => o.CustomerId);
+            entity.HasIndex(o => o.OrderDate);
+            entity.HasMany(o => o.Items)
+                .WithOne(oi => oi.Order)
+                .HasForeignKey(oi => oi.OrderId);
+        });
+
+        // OrderItem configuration
+        modelBuilder.Entity<OrderItem>(entity =>
+        {
+            entity.HasKey(oi => oi.Id);
+            entity.Property(oi => oi.UnitPrice).HasPrecision(10, 2);
+            entity.Property(oi => oi.TotalPrice).HasPrecision(10, 2);
+            entity.HasIndex(oi => new { oi.OrderId, oi.ProductId });
+        });
+
+        // Customer configuration
+        modelBuilder.Entity<Customer>(entity =>
+        {
+            entity.HasKey(c => c.Id);
+            entity.Property(c => c.Id).HasMaxLength(50);
+            entity.Property(c => c.Name).IsRequired().HasMaxLength(200);
+            entity.Property(c => c.Email).IsRequired().HasMaxLength(200);
+            entity.HasIndex(c => c.Email).IsUnique();
+            entity.HasMany(c => c.Orders)
+                .WithOne()
+                .HasForeignKey(o => o.CustomerId);
+        });
+    }
+}