This is a comprehensive guide to integrating Drizzle ORM with PostgreSQL in a Next.js 15 application. The article covers various aspects of the integration, including setting up Drizzle Kit for migration and seeding, creating schema files, defining relations between tables, running migrations, seeding the database, performing server-side queries and mutations using Drizzle Query APIs, and updating forms to work seamlessly with Drizzle ORM. Throughout the guide, examples are provided to demonstrate how to implement each step in practice. The guide concludes by highlighting the benefits of using Drizzle ORM in a Next.js application and providing resources for further learning.