update

Program.cs

@@ -4,7 +4,7 @@ using Microsoft.EntityFrameworkCore;
 var builder = WebApplication.CreateBuilder(args);
 
 var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
-    ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
+    ?? throw new InvalidOperationException("Connection string 'DefaultConnection' was not found.");
 
 builder.Services.AddDbContext<AppDbContext>(options =>
     options.UseNpgsql(connectionString));