Added ef core integration

debug/TestApplication/DatabaseContext.cs

@@ -0,0 +1,20 @@
+using Microsoft.EntityFrameworkCore;
+using TestApplication.Models;
+
+namespace TestApplication;
+
+public class DatabaseContext(DbContextOptions<DatabaseContext> options) : DbContext(options) {
+
+    public DbSet<User> Users { get; set; }
+
+    public DbSet<Post> Posts { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder) {
+        base.OnModelCreating(modelBuilder);
+
+        modelBuilder.Entity<User>()
+            .HasMany(u => u.Posts)
+            .WithOne(p => p.Sender)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}