Develop a newsletter subscription website using Next.js, incorporating Supabase for database management. The website should include a user-friendly interface for visitors to subscribe to the newsletter via email. Implement an administrative backend for managing subscribers, composing, and dispatching newsletters. Ensure the system is designed to handle email subscriptions efficiently, with features for subscriber management and newsletter distribution.
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Enhance the newsletter subscription website by integrating an administrative authentication system. This system should allow the creation and management of admin accounts with secure login capabilities. Implement features for role-based access control, ensuring that only authorized administrators can access the backend for subscriber management, newsletter composition, and distribution. The authentication process should include secure password storage and management, such as hashing and salting, to protect admin credentials. The system should also provide a mechanism for administrators to reset their passwords if needed.
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Address the 'Multiple GoTrueClient instances detected' warning in the browser console, ensuring that the Next.js application initializes only one instance of the GoTrueClient to prevent potential undefined behavior. Resolve the 'SQL execution error: insert or update on table "admin_profiles" violates foreign key constraint "admin_profiles_id_fkey"' error. This should involve reviewing the SQL scripts (03-admin-auth-setup.sql and 04-create-super-admin.sql) and the database schema to identify and correct any foreign key constraint violations or inconsistencies in the admin profile setup. Ensure that the admin profiles are correctly linked to the user accounts created during the authentication process.