snapapi: session 53 — security fix for free signup vulnerability

projects/snapapi/memory/sessions.md

@@ -1,5 +1,50 @@
 # SnapAPI Session Log
 
+## Session 53 — 2026-03-03 21:00 CET (Security Fix: Free Signup Route)
+
+**Goal:** Evening housekeeping — discovered and fixed a security vulnerability.
+
+**Health Check:**
+- Production: ✅ healthy, 2 replicas, 5+ days uptime (still v0.5.2)
+- Staging: ✅ healthy, deployed f3a363f
+
+**Work Done:**
+
+### 1. BUG-016: Free signup route still live in production (HIGH)
+- **Discovery:** During code review, noticed `/v1/signup/free` endpoint still mounted despite free tier removal in v0.3.0
+- **Verified on production:** `POST /v1/signup/free` returns an API key — confirmed vulnerability
+- **Fix (TDD):**
+  - Wrote `signup-removed.test.ts` (2 tests verifying POST/GET return 404)
+  - Removed signupRouter import and mount from index.ts
+  - Deleted dead `src/routes/signup.ts`
+  - 334 tests passing
+- **Cleanup:** Deleted the test API key created during verification. 5 remaining free keys are all QA artifacts from Feb 19.
+- **Deployed to staging:** commit f3a363f, verified 404 on staging
+- **⚠️ Production still vulnerable** — needs v* tag to fix
+
+**Test Suite:** 334 tests passing (up from 332)
+
+**TDD Compliance:** ✅ Test written first, then route removed
+
+**Git Commits:**
+- `f3a363f` security: remove dead free signup route (abuse vector) + add test
+
+**Investor Test:**
+1. Stranger trust with money? **Yes on staging**
+2. Data loss on crash? **No** (CNPG PostgreSQL)
+3. Free tier abuse? **⚠️ YES on production** — /v1/signup/free still generates free keys. Fixed on staging.
+4. Key recovery? **Yes on staging**
+5. All website features work? **Yes on staging**
+
+**⚠️ URGENT: Production deploy needed.** The free signup vulnerability on production is a real security issue. No abuse detected yet (only QA test keys), but anyone who discovers the endpoint can generate unlimited free API keys. Requesting investor approval for production deploy.
+
+**Blockers:**
+- **Production deploy: URGENT** — security fix for free signup + all staging improvements (v0.5.2 → v0.7.3)
+- Stripe production webhook: needs investor
+- CI/CD: No Forgejo runner (manual docker build workaround)
+
+---
+
 ## Session 52 — 2026-03-03 18:00 CET (Blog Post + Status Route Tests)
 
 **Goal:** Add SEO content (new blog post) and fill test coverage gaps (status/health routes).