# Feuerwehr Dashboard — Project Rules

## Stack
- **Frontend:** React / Vite / MUI / TypeScript (`frontend/`)
- **Backend:** Node / Express / TypeScript (`backend/`)
- **DB:** PostgreSQL — migrations in `backend/src/database/migrations/`
- **Deployment:** Docker Compose — never run Docker commands locally

## Migrations
- All migrations must be idempotent (safe to run multiple times)
- Verify column and table names match existing schema before writing
- Never rename env vars used by external systems without explicit approval

## Data Safety
- "Purge user data" means delete records / preferences / history only — never delete user accounts

## Debugging Scope
- When debugging, only touch files directly related to the change you made
- Never edit files in another layer without explicit permission
- If a fix requires a cross-layer change, report it rather than making it unilaterally

## Multi-Agent Work
- After all agents complete, run a verification pass: build, migrations, UI states, modal behavior
- All agent task descriptions must be self-contained (file paths, patterns, acceptance criteria)