chore: initial commit (Ausgangszustand der Vorlage)

.claude/skills/backend/checklist.md

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+# Backend Implementation Checklist
+
+## Core Checklist
+- [ ] Checked existing tables/APIs via git before creating new ones
+- [ ] Database tables created in Supabase
+- [ ] Row Level Security enabled on ALL new tables
+- [ ] RLS policies created for SELECT, INSERT, UPDATE, DELETE
+- [ ] Indexes created on performance-critical columns
+- [ ] Foreign keys set with appropriate ON DELETE behavior
+- [ ] All planned API endpoints implemented in `/src/app/api/`
+- [ ] Authentication verified (no access without valid session)
+- [ ] Input validation with Zod on all POST/PUT requests
+- [ ] Meaningful error messages with correct HTTP status codes
+- [ ] No TypeScript errors in API routes
+- [ ] All endpoints tested manually
+- [ ] No hardcoded secrets in source code
+- [ ] Frontend connected to real API endpoints
+- [ ] User has reviewed and approved
+
+## Verification (run before marking complete)
+- [ ] `npm run build` passes without errors
+- [ ] All acceptance criteria from feature spec addressed in API
+- [ ] All API endpoints return correct status codes (test with curl or browser)
+- [ ] `features/INDEX.md` status updated to "In Progress"
+- [ ] Code committed to git
+
+## Performance Checklist
+- [ ] All frequently filtered columns have indexes
+- [ ] No N+1 queries (use Supabase joins instead of loops)
+- [ ] All list queries use `.limit()`
+- [ ] Zod validation on all write endpoints
+- [ ] Slow queries cached where appropriate (optional for MVP)
+- [ ] Rate limiting on public-facing APIs (optional for MVP)