implement Phase 1-2

backend/WordVersioning.Api/Data/AppDbContext.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore;
+using WordVersioning.Api.Models;
+
+namespace WordVersioning.Api.Data;
+
+public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
+{
+    public DbSet<Document> Documents => Set<Document>();
+
+    public DbSet<DocumentVersion> DocumentVersions => Set<DocumentVersion>();
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Document>(entity =>
+        {
+            entity.HasKey(x => x.Id);
+            entity.Property(x => x.FileName).HasMaxLength(512);
+            entity.Property(x => x.AddInSignature).HasMaxLength(64);
+        });
+
+        modelBuilder.Entity<DocumentVersion>(entity =>
+        {
+            entity.HasKey(x => x.Id);
+
+            // กัน versionNumber ซ้ำตอน upload พร้อมกัน (retry ที่ controller เมื่อชน constraint)
+            entity.HasIndex(x => new { x.DocumentId, x.VersionNumber }).IsUnique();
+
+            entity.Property(x => x.ObjectKey).HasMaxLength(1024);
+            entity.Property(x => x.ContentHash).HasMaxLength(64);
+
+            entity.HasOne(x => x.Document)
+                .WithMany(d => d.Versions)
+                .HasForeignKey(x => x.DocumentId);
+        });
+    }
+}