mrp/STRUCTURE.md

# Project Structure

## Documentation maintenance

- Keep [CHANGELOG.md](D:/CODING/mrp-codex/CHANGELOG.md) updated when structural or implementation changes materially affect shipped behavior.
- If structure guidance changes, update the related source-of-truth docs in [README.md](D:/CODING/mrp-codex/README.md), [INSTRUCTIONS.md](D:/CODING/mrp-codex/INSTRUCTIONS.md), [ROADMAP.md](D:/CODING/mrp-codex/ROADMAP.md), [UNRAID.md](D:/CODING/mrp-codex/UNRAID.md), and [AGENTS.md](D:/CODING/mrp-codex/AGENTS.md) as needed.

## Top-level layout

- `client/`: frontend application
- `server/`: backend application
- `shared/`: shared TypeScript contracts, permissions, and utility types
- `Dockerfile`: production container build
- `docker-entrypoint.sh`: migration-aware startup script

## Frontend rules

- Organize code by domain under `src/modules`.
- Keep app-shell concerns in `src/app`.
- Keep reusable UI primitives in `src/components`.
- Theme state and brand tokens belong in `src/theme`.
- PDF screen components must remain separate from API-rendered document templates.
- Treat `src/modules/dashboard` as a long-lived operational module. New high-level KPI, alert, queue, and shortcut surfaces should compose into it rather than spawning disconnected landing pages.
- Any non-filter lookup UI must be implemented as a searchable picker or autocomplete; do not use long static dropdowns for operational datasets such as items, customers, vendors, or document-linked records.
- Inventory items expose both cost and sell price. Downstream sales document entry should default from the item price field rather than requiring duplicate price maintenance.
- Future vendor-facing purchasing flows should follow the same searchable-lookup rule and shared document/totals model already used by sales.
- Purchase-order item pickers must only surface inventory items flagged as purchasable.
- Shipping, sales, and future purchasing PDFs should be rendered through the backend documents module and shared Puppeteer pipeline rather than ad hoc frontend-only exports.
- Preserve the current dense operations UI style on active module pages: compact controls, tighter card padding, and shorter empty states unless a screen has a clear reason to be more spacious.
- Treat `projects` as its own long-lived domain under both client and server. It should continue integrating with CRM, sales, inventory, purchasing, shipping, and planning rather than living inside only one of those modules.
- Treat `manufacturing` as a separate long-lived domain from `projects`; work orders, routings, labor capture, WIP, and shop-floor execution should not be modeled only as project fields.
- Treat `planning` as the scheduling/visibility layer that consumes project and manufacturing data rather than replacing either domain.
- When adding a new top-level module to the shell, add a lightweight SVG icon in the navigation config so desktop and mobile nav stay aligned.

## Backend rules

- Organize domain modules under `src/modules/<domain>`.
- Keep HTTP routers thin; place business logic in services.
- Centralize Prisma access, auth middleware, persisted session helpers, file storage utilities, startup validation, and support logging in `src/lib`.
- Store persistence-related constants under `src/config`.
- Serve the built frontend from the API layer in production.

## Shared package rules

- Place cross-app DTOs, permission keys, enums, and document interfaces in `shared/src`.
- Keep shared code free of runtime framework dependencies.

## Adding a new domain

1. Add backend routes, service, and repository/module files under `server/src/modules/<domain>`.
2. Add Prisma models and a migration if the module needs persistence.
3. Add permission keys in `shared/src/auth`.
4. Add frontend route/module under `client/src/modules/<domain>`.
5. Register navigation and route guards through the app shell without refactoring existing modules.