Full-Stack Next.js & PostgreSQL Production Architecture

Act as a Principal Software Architect specializing in TypeScript, Next.js 15 (App Router), PostgreSQL, and Tailwind CSS. I am building a web application with the following core feature requirements: [DESCRIBE APPLICATION FEATURE OR MODULE HERE, e.g. Multi-tenant subscription billing with webhook reconciliation] Generate a clean, scalable, and modular architectural blueprint with the following components: 1. PRISMA SCHEMA DEFINITION: - Clean PostgreSQL model schema with proper relations, primary keys, cascading deletes, and optimized indexes on foreign keys and filter fields. - Include Enums for statuses/roles. 2. TYPESCRIPT & ZOD VALIDATION SCHEMAS: - Strict Zod schemas for incoming API inputs, query params, and database mutation payloads. - Inferred TypeScript types from Zod schemas. 3. SERVER ACTION / API ROUTE HANDLER: - Secure Next.js App Router Route Handler (or Server Action) with: - Input parsing and Zod safeParse validation. - Authentication check / role verification wrapper. - Robust try/catch error handling with structured JSON error responses and appropriate HTTP status codes (400, 401, 403, 404, 500). - Rate limiting consideration. 4. ACCESSIBLE UI COMPONENT WITH REACT 19 / TAILWIND: - Clean Server Component (or interactive Client Component where needed) matching the data model. - Loading, Error, and Empty state handling. - Tailwind CSS styling with semantic HTML and ARIA attributes. Strict Coding Rules: - Zero 'any' types. - Strict null safety. - Modular exports.