Closes #21559: Add CLAUDE.md

CLAUDE.md

@@ -0,0 +1,84 @@
+# NetBox
+
+Network source-of-truth and infrastructure resource modeling (IRM) tool combining DCIM and IPAM. Built on Django + PostgreSQL + Redis.
+
+## Tech Stack
+- Python 3.12+ / Django / Django REST Framework
+- PostgreSQL (required), Redis (required for caching/queuing)
+- GraphQL via Strawberry, background jobs via RQ
+- Docs: MkDocs (in `docs/`)
+
+## Repository Layout
+- `netbox/` — Django project root; run all `manage.py` commands from here
+- `netbox/netbox/` — Core settings, URLs, WSGI entrypoint
+- `netbox/<app>/` — Django apps: `circuits`, `core`, `dcim`, `ipam`, `extras`, `tenancy`, `virtualization`, `wireless`, `users`, `vpn`
+- `docs/` — MkDocs documentation source
+- `contrib/` — Example configs (systemd, nginx, etc.) and other resources
+
+## Development Setup
+```bash
+python -m venv ~/.venv/netbox
+source ~/.venv/netbox/bin/activate
+pip install -r requirements.txt
+
+# Copy and configure
+cp netbox/netbox/configuration.example.py netbox/netbox/configuration.py
+# Edit configuration.py: set DATABASE, REDIS, SECRET_KEY, ALLOWED_HOSTS
+
+cd netbox/
+python manage.py migrate
+python manage.py runserver
+```
+
+## Key Commands
+All commands run from the `netbox/` subdirectory with venv active.
+
+```bash
+# Development server
+python manage.py runserver
+
+# Run full test suite
+export NETBOX_CONFIGURATION=netbox.configuration_testing
+python manage.py test
+
+# Faster test runs (no DB rebuild, parallel)
+python manage.py test --keepdb --parallel 4
+
+# Migrations
+python manage.py makemigrations
+python manage.py migrate
+
+# Shell
+python manage.py nbshell   # NetBox-enhanced shell
+```
+
+## Architecture Conventions
+- **Apps**: Each Django app owns its models, views, API serializers, filtersets, forms, and tests.
+- **REST API**: DRF serializers live in `<app>/api/serializers.py`; viewsets in `<app>/api/views.py`; URLs auto-registered in `<app>/api/urls.py`.
+- **GraphQL**: Strawberry types in `<app>/graphql/types.py`.
+- **Filtersets**: `<app>/filtersets.py` — used for both UI filtering and API `?filter=` params.
+- **Tables**: `django-tables2` used for all object list views (`<app>/tables.py`).
+- **Templates**: Django templates in `netbox/templates/<app>/`.
+- **Tests**: Mirror the app structure in `<app>/tests/`. Use `netbox.configuration_testing` for test config.
+
+## Coding Standards
+- Follow existing Django conventions; don't reinvent patterns already present in the codebase.
+- New models must include `created`, `last_updated` fields (inherit from `NetBoxModel` where appropriate).
+- Every model exposed in the UI needs: model, serializer, filterset, form, table, views, URL route, and tests.
+- API serializers must include a `url` field (absolute URL of the object).
+- Use `FeatureQuery` for generic relations (config contexts, custom fields, tags, etc.).
+- Avoid adding new dependencies without strong justification.
+
+## Branch & PR Conventions
+- Branch naming: `<issue-number>-short-description` (e.g., `1234-device-typerror`)
+- Use the `main` branch for patch releases; `feature` tracks work for the upcoming minor/major release.
+- Every PR must reference an approved GitHub issue.
+- PRs must include tests for new functionality.
+
+## Gotchas
+- `configuration.py` is gitignored — never commit it.
+- `manage.py` lives in `netbox/`, NOT the repo root. Running from the wrong directory is a common mistake.
+- `NETBOX_CONFIGURATION` env var controls which settings module loads; set to `netbox.configuration_testing` for tests.
+- The `extras` app is a catch-all for cross-cutting features (custom fields, tags, webhooks, scripts).
+- Plugins API: only documented public APIs are stable. Internal NetBox code is subject to change without notice.
+- See `docs/development/` for the full contributing guide and code style details.