Convex Adapter for Auth.js (NextAuth) Setup Guide

The guide provides a comprehensive setup for configuring Convex as a database adapter for Auth.js (NextAuth), detailing the integration process with code examples for efficient database operations. It starts with instructions on installing necessary dependencies like convex-helpers and setting up schemas for various entities such as users, sessions, accounts, and verification tokens, which are modeled after Auth.js conventions. The guide also explains implementing Convex adapter endpoints using custom queries and mutations to manage user accounts and sessions securely, emphasizing the importance of environment variables like CONVEX_AUTH_ADAPTER_SECRET to protect these endpoints. Additionally, it covers authentication protocols using OpenID Connect, requiring JWTs signed with a private key, and guides on generating and managing these keys. The document outlines how to modify the Convex auth configuration and integrate the ConvexAdapter with Auth.js in a Next.js environment, providing detailed instructions on issuing JWTs and ensuring secure interactions between the Next.js server and the Convex backend.